Move nvme driver source into subdirectory and move pci specifics from core into separate file

From: Jay Sternberg <[email protected]>
Date: Thu, 24 Sep 2015 09:16:07 -0700
Subject: [PATCH] Move nvme driver source into subdirectory and move pci specifics from core into separate file

A re-organization of PCIe specific code and the NVMe protocol described in the currently public NVMe specification for proper future extension of NVMe beyond PCIe.

---
 drivers/block/Kconfig       |   11 +-
 drivers/block/Makefile      |    2 +-
 drivers/block/nvme-core.c   | 3395 -----------------------------------
--------
 drivers/block/nvme-scsi.c   | 2556 --------------------------------
 drivers/block/nvme/Kconfig  |   28 +
 drivers/block/nvme/Makefile |   15 +
 drivers/block/nvme/common.h |  167 +++
 drivers/block/nvme/core.c   | 2804 +++++++++++++++++++++++++++++++++++
 drivers/block/nvme/ops.h    |   71 +
 drivers/block/nvme/pci.c    |  981 +++++++++++++
 drivers/block/nvme/pci.h    |  103 ++
 drivers/block/nvme/scsi.c   | 2538 ++++++++++++++++++++++++++++++++
 12 files changed, 6709 insertions(+), 5962 deletions(-)
 delete mode 100644 drivers/block/nvme-core.c
 delete mode 100644 drivers/block/nvme-scsi.c
 create mode 100644 drivers/block/nvme/Kconfig
 create mode 100644 drivers/block/nvme/Makefile
 create mode 100644 drivers/block/nvme/common.h
 create mode 100644 drivers/block/nvme/core.c
 create mode 100644 drivers/block/nvme/ops.h
 create mode 100644 drivers/block/nvme/pci.c
 create mode 100644 drivers/block/nvme/pci.h
 create mode 100644 drivers/block/nvme/scsi.c

index 1b8094d..fda69ca 100644
@@ -310,16 +310,7 @@ config BLK_DEV_NBD
 
 	  If unsure, say N.
 
-config BLK_DEV_NVME
-	tristate "NVM Express block device"
-	depends on PCI
-	---help---
-	  The NVM Express driver is for solid state drives directly
-	  connected to the PCI or PCI Express bus.  If you know you
-	  don't have one of these, it is safe to answer N.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called nvme.
+source "drivers/block/nvme/Kconfig"
 
 config BLK_DEV_SKD
 	tristate "STEC S1120 Block Driver"

index 02b688d..bd11aab 100644
@@ -22,7 +22,7 @@ obj-$(CONFIG_XILINX_SYSACE)	+= xsysace.o
 obj-$(CONFIG_CDROM_PKTCDVD)	+= pktcdvd.o
 obj-$(CONFIG_MG_DISK)		+= mg_disk.o
 obj-$(CONFIG_SUNVDC)		+= sunvdc.o
-obj-$(CONFIG_BLK_DEV_NVME)	+= nvme.o
+obj-$(CONFIG_BLK_DEV_NVME)	+= nvme/
 obj-$(CONFIG_BLK_DEV_SKD)	+= skd.o
 obj-$(CONFIG_BLK_DEV_OSD)	+= osdblk.o
 

deleted file mode 100644
index b97fc3f..0000000
@@ -1,3395 +0,0 @@
-/*
- * NVM Express device driver
- * Copyright (c) 2011-2014, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or

modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- */
-
-#include <linux/nvme.h>
-#include <linux/bitops.h>
-#include <linux/blkdev.h>
-#include <linux/blk-mq.h>
-#include <linux/cpu.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/hdreg.h>
-#include <linux/idr.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kdev_t.h>
-#include <linux/kthread.h>
-#include <linux/kernel.h>
-#include <linux/list_sort.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/pci.h>
-#include <linux/poison.h>
-#include <linux/ptrace.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/t10-pi.h>
-#include <linux/types.h>
-#include <scsi/sg.h>
-#include <asm-generic/io-64-nonatomic-lo-hi.h>
-
-#define NVME_MINORS (1U << MINORBITS)
-#define NVME_Q_DEPTH 1024
-#define NVME_AQ_DEPTH 256
-#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
-#define CQ_SIZE(depth) (depth * sizeof(struct
nvme_completion))
-#define ADMIN_TIMEOUT (admin_timeout * HZ)
-#define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
-
-static unsigned char admin_timeout = 60; -module_param(admin_timeout, byte, 0644); -MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
-
-unsigned char nvme_io_timeout = 30; -module_param_named(io_timeout, nvme_io_timeout, byte, 0644); -MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); -
-static unsigned char shutdown_timeout = 5; -module_param(shutdown_timeout, byte, 0644); -MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
-
-static int nvme_major;
-module_param(nvme_major, int, 0);
-
-static int nvme_char_major;
-module_param(nvme_char_major, int, 0);
-
-static int use_threaded_interrupts; -module_param(use_threaded_interrupts, int, 0);
-
-static bool use_cmb_sqes = true; -module_param(use_cmb_sqes, bool, 0644); -MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes");
-
-static DEFINE_SPINLOCK(dev_list_lock);
-static LIST_HEAD(dev_list);
-static struct task_struct *nvme_thread;
-static struct workqueue_struct *nvme_workq;
-static wait_queue_head_t nvme_kthread_wait;
-
-static struct class *nvme_class;
-
-static void nvme_reset_failed_dev(struct work_struct *ws); -static int nvme_reset(struct nvme_dev *dev);
-static int nvme_process_cq(struct nvme_queue *nvmeq);
-
-struct async_cmd_info {
- struct kthread_work work;
- struct kthread_worker *worker;
- struct request *req;
- u32 result;
- int status;
- void *ctx;
-};
-
-/*
- * An NVM Express queue. Each device has at least two (one for admin
- * commands and one for I/O commands).
- */
-struct nvme_queue {
- struct device *q_dmadev;
- struct nvme_dev *dev;
- char irqname[24]; /* nvme4294967295-65535\0 */
- spinlock_t q_lock;
- struct nvme_command *sq_cmds;
- struct nvme_command __iomem *sq_cmds_io;
- volatile struct nvme_completion *cqes;
- struct blk_mq_tags **tags;
- dma_addr_t sq_dma_addr;
- dma_addr_t cq_dma_addr;
- u32 __iomem *q_db;
- u16 q_depth;
- s16 cq_vector;
- u16 sq_head;
- u16 sq_tail;
- u16 cq_head;
- u16 qid;
- u8 cq_phase;
- u8 cqe_seen;
- struct async_cmd_info cmdinfo;
-};
-
-/*
- * Check we didin't inadvertently grow the command struct
- */
-static inline void _nvme_check_size(void)
-{
- BUILD_BUG_ON(sizeof(struct nvme_rw_command) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_create_cq) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_create_sq) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_delete_queue) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_features) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_format_cmd) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_abort_cmd) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_command) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_id_ctrl) != 4096);
- BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096);
- BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64);
- BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512);
-}
-
-typedef void (*nvme_completion_fn)(struct nvme_queue *, void *,
- struct nvme_completion
*);
-
-struct nvme_cmd_info {
- nvme_completion_fn fn;
- void *ctx;
- int aborted;
- struct nvme_queue *nvmeq;
- struct nvme_iod iod[0];
-};
-
-/*
- * Max size of iod being embedded in the request payload
- */
-#define NVME_INT_PAGES 2
-#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->page_size)
-#define NVME_INT_MASK 0x01
-
-/*
- * Will slightly overestimate the number of pages needed. This is OK
- * as it only leads to a small amount of wasted memory for the lifetime of
- * the I/O.
- */
-static int nvme_npages(unsigned size, struct nvme_dev *dev) -{
- unsigned nprps = DIV_ROUND_UP(size + dev->page_size, dev
->page_size);
- return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
-}
-
-static unsigned int nvme_cmd_size(struct nvme_dev *dev)
-{
- unsigned int ret = sizeof(struct nvme_cmd_info);
-
- ret += sizeof(struct nvme_iod);
- ret += sizeof(__le64 *) * nvme_npages(NVME_INT_BYTES(dev),
dev);
- ret += sizeof(struct scatterlist) * NVME_INT_PAGES;
-
- return ret;
-}
-
-static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
- unsigned int hctx_idx)
-{
- struct nvme_dev *dev = data;
- struct nvme_queue *nvmeq = dev->queues[0];
-
- WARN_ON(hctx_idx != 0);
- WARN_ON(dev->admin_tagset.tags[0] != hctx->tags);
- WARN_ON(nvmeq->tags);
-
- hctx->driver_data = nvmeq;
- nvmeq->tags = &dev->admin_tagset.tags[0];
- return 0;
-}
-
-static void nvme_admin_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx)
-{
- struct nvme_queue *nvmeq = hctx->driver_data;
-
- nvmeq->tags = NULL;
-}
-
-static int nvme_admin_init_request(void *data, struct request *req,
- unsigned int hctx_idx, unsigned int
rq_idx,
- unsigned int numa_node)
-{
- struct nvme_dev *dev = data;
- struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
- struct nvme_queue *nvmeq = dev->queues[0];
-
- BUG_ON(!nvmeq);
- cmd->nvmeq = nvmeq;
- return 0;
-}
-
-static int nvme_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
- unsigned int hctx_idx)
-{
- struct nvme_dev *dev = data;
- struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
-
- if (!nvmeq->tags)
- nvmeq->tags = &dev->tagset.tags[hctx_idx];
-
- WARN_ON(dev->tagset.tags[hctx_idx] != hctx->tags);
- hctx->driver_data = nvmeq;
- return 0;
-}
-
-static int nvme_init_request(void *data, struct request *req,
- unsigned int hctx_idx, unsigned int
rq_idx,
- unsigned int numa_node)
-{
- struct nvme_dev *dev = data;
- struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
- struct nvme_queue *nvmeq = dev->queues[hctx_idx + 1];
-
- BUG_ON(!nvmeq);
- cmd->nvmeq = nvmeq;
- return 0;
-}
-
-static void nvme_set_info(struct nvme_cmd_info *cmd, void *ctx,
- nvme_completion_fn handler)
-{
- cmd->fn = handler;
- cmd->ctx = ctx;
- cmd->aborted = 0;
- blk_mq_start_request(blk_mq_rq_from_pdu(cmd));
-}
-
-static void *iod_get_private(struct nvme_iod *iod)
-{
- return (void *) (iod->private & ~0x1UL);
-}
-
-/*
- * If bit 0 is set, the iod is embedded in the request payload.
- */
-static bool iod_should_kfree(struct nvme_iod *iod)
-{
- return (iod->private & NVME_INT_MASK) == 0;
-}
-
-/* Special values must be less than 0x1000 */
-#define CMD_CTX_BASE ((void *)POISON_POINTER_DELTA)
-#define CMD_CTX_CANCELLED (0x30C + CMD_CTX_BASE)
-#define CMD_CTX_COMPLETED (0x310 + CMD_CTX_BASE)
-#define CMD_CTX_INVALID (0x314 + CMD_CTX_BASE)
-
-static void special_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion
*cqe)
-{
- if (ctx == CMD_CTX_CANCELLED)
- return;
- if (ctx == CMD_CTX_COMPLETED) {
- dev_warn(nvmeq->q_dmadev,
- "completed id %d twice on queue %d\n",
- cqe->command_id, le16_to_cpup(&cqe
->sq_id));
- return;
- }
- if (ctx == CMD_CTX_INVALID) {
- dev_warn(nvmeq->q_dmadev,
- "invalid id %d completed on queue
%d\n",
- cqe->command_id, le16_to_cpup(&cqe
->sq_id));
- return;
- }
- dev_warn(nvmeq->q_dmadev, "Unknown special completion %p\n",
ctx);
-}
-
-static void *cancel_cmd_info(struct nvme_cmd_info *cmd, nvme_completion_fn *fn)
-{
- void *ctx;
-
- if (fn)
- *fn = cmd->fn;
- ctx = cmd->ctx;
- cmd->fn = special_completion;
- cmd->ctx = CMD_CTX_CANCELLED;
- return ctx;
-}
-
-static void async_req_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion
*cqe)
-{
- u32 result = le32_to_cpup(&cqe->result);
- u16 status = le16_to_cpup(&cqe->status) >> 1;
-
- if (status == NVME_SC_SUCCESS || status == NVME_SC_ABORT_REQ)
- ++nvmeq->dev->event_limit;
- if (status != NVME_SC_SUCCESS)
- return;
-
- switch (result & 0xff07) {
- case NVME_AER_NOTICE_NS_CHANGED:
- dev_info(nvmeq->q_dmadev, "rescanning\n");
- schedule_work(&nvmeq->dev->scan_work);
- default:
- dev_warn(nvmeq->q_dmadev, "async event result %08x\n",
result);
- }
-}
-
-static void abort_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion
*cqe)
-{
- struct request *req = ctx;
-
- u16 status = le16_to_cpup(&cqe->status) >> 1;
- u32 result = le32_to_cpup(&cqe->result);
-
- blk_mq_free_request(req);
-
- dev_warn(nvmeq->q_dmadev, "Abort status:%x result:%x", status,
result);
- ++nvmeq->dev->abort_limit;
-}
-
-static void async_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion
*cqe)
-{
- struct async_cmd_info *cmdinfo = ctx;
- cmdinfo->result = le32_to_cpup(&cqe->result);
- cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
- queue_kthread_work(cmdinfo->worker, &cmdinfo->work);
- blk_mq_free_request(cmdinfo->req);
-}
-
-static inline struct nvme_cmd_info *get_cmd_from_tag(struct nvme_queue *nvmeq,
- unsigned int tag)
-{
- struct request *req = blk_mq_tag_to_rq(*nvmeq->tags, tag);
-
- return blk_mq_rq_to_pdu(req);
-}
-
-/*
- * Called with local interrupts disabled and the q_lock held. May not sleep.
- */
-static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag,
- nvme_completion_fn
*fn)
-{
- struct nvme_cmd_info *cmd = get_cmd_from_tag(nvmeq, tag);
- void *ctx;
- if (tag >= nvmeq->q_depth) {
- *fn = special_completion;
- return CMD_CTX_INVALID;
- }
- if (fn)
- *fn = cmd->fn;
- ctx = cmd->ctx;
- cmd->fn = special_completion;
- cmd->ctx = CMD_CTX_COMPLETED;
- return ctx;
-}
-
-/**
- * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell
- * @nvmeq: The queue to use
- * @cmd: The command to send
- *
- * Safe to use from interrupt context
- */
-static void __nvme_submit_cmd(struct nvme_queue *nvmeq,
- struct nvme_command
*cmd)
-{
- u16 tail = nvmeq->sq_tail;
-
- if (nvmeq->sq_cmds_io)
- memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd,
sizeof(*cmd));
- else
- memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd));
-
- if (++tail == nvmeq->q_depth)
- tail = 0;
- writel(tail, nvmeq->q_db);
- nvmeq->sq_tail = tail;
-}
-
-static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd)
-{
- unsigned long flags;
- spin_lock_irqsave(&nvmeq->q_lock, flags);
- __nvme_submit_cmd(nvmeq, cmd);
- spin_unlock_irqrestore(&nvmeq->q_lock, flags);
-}
-
-static __le64 **iod_list(struct nvme_iod *iod)
-{
- return ((void *)iod) + iod->offset;
-}
-
-static inline void iod_init(struct nvme_iod *iod, unsigned nbytes,
- unsigned nseg, unsigned long private)
-{
- iod->private = private;
- iod->offset = offsetof(struct nvme_iod, sg[nseg]);
- iod->npages = -1;
- iod->length = nbytes;
- iod->nents = 0;
-}
-
-static struct nvme_iod *
-__nvme_alloc_iod(unsigned nseg, unsigned bytes, struct nvme_dev *dev,
- unsigned long priv, gfp_t gfp)
-{
- struct nvme_iod *iod = kmalloc(sizeof(struct nvme_iod) +
- sizeof(__le64 *) * nvme_npages(bytes,
dev) +
- sizeof(struct scatterlist) * nseg,
gfp);
-
- if (iod)
- iod_init(iod, bytes, nseg, priv);
-
- return iod;
-}
-
-static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev,
- gfp_t gfp)
-{
- unsigned size = !(rq->cmd_flags & REQ_DISCARD) ?
blk_rq_bytes(rq) :
- sizeof(struct
nvme_dsm_range);
- struct nvme_iod *iod;
-
- if (rq->nr_phys_segments <= NVME_INT_PAGES &&
- size <= NVME_INT_BYTES(dev)) {
- struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(rq);
-
- iod = cmd->iod;
- iod_init(iod, size, rq->nr_phys_segments,
- (unsigned long) rq | NVME_INT_MASK);
- return iod;
- }
-
- return __nvme_alloc_iod(rq->nr_phys_segments, size, dev,
- (unsigned long) rq, gfp);
-}
-
-static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod) -{
- const int last_prp = dev->page_size / 8 - 1;
- int i;
- __le64 **list = iod_list(iod);
- dma_addr_t prp_dma = iod->first_dma;
-
- if (iod->npages == 0)
- dma_pool_free(dev->prp_small_pool, list[0], prp_dma);
- for (i = 0; i < iod->npages; i++) {
- __le64 *prp_list = list[i];
- dma_addr_t next_prp_dma =
le64_to_cpu(prp_list[last_prp]);
- dma_pool_free(dev->prp_page_pool, prp_list, prp_dma);
- prp_dma = next_prp_dma;
- }
-
- if (iod_should_kfree(iod))
- kfree(iod);
-}
-
-static int nvme_error_status(u16 status)
-{
- switch (status & 0x7ff) {
- case NVME_SC_SUCCESS:
- return 0;
- case NVME_SC_CAP_EXCEEDED:
- return -ENOSPC;
- default:
- return -EIO;
- }
-}
-
-#ifdef CONFIG_BLK_DEV_INTEGRITY
-static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) -{
- if (be32_to_cpu(pi->ref_tag) == v)
- pi->ref_tag = cpu_to_be32(p);
-}
-
-static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) -{
- if (be32_to_cpu(pi->ref_tag) == p)
- pi->ref_tag = cpu_to_be32(v);
-}
-
-/**
- * nvme_dif_remap - remaps ref tags to bip seed and physical lba
- *
- * The virtual start sector is the one that was originally submitted by the
- * block layer. Due to partitioning, MD/DM cloning, etc. the
actual physical
- * start sector may be different. Remap protection information to match the
- * physical LBA on writes, and back to the original seed on reads.
- *
- * Type 0 and 3 do not have a ref tag, so no remapping required.
- */
-static void nvme_dif_remap(struct request *req,
- void (*dif_swap)(u32 p, u32 v, struct
t10_pi_tuple *pi))
-{
- struct nvme_ns *ns = req->rq_disk->private_data;
- struct bio_integrity_payload *bip;
- struct t10_pi_tuple *pi;
- void *p, *pmap;
- u32 i, nlb, ts, phys, virt;
-
- if (!ns->pi_type || ns->pi_type == NVME_NS_DPS_PI_TYPE3)
- return;
-
- bip = bio_integrity(req->bio);
- if (!bip)
- return;
-
- pmap = kmap_atomic(bip->bip_vec->bv_page) + bip->bip_vec
->bv_offset;
-
- p = pmap;
- virt = bip_get_seed(bip);
- phys = nvme_block_nr(ns, blk_rq_pos(req));
- nlb = (blk_rq_bytes(req) >> ns->lba_shift);
- ts = ns->disk->integrity->tuple_size;
-
- for (i = 0; i < nlb; i++, virt++, phys++) {
- pi = (struct t10_pi_tuple *)p;
- dif_swap(phys, virt, pi);
- p += ts;
- }
- kunmap_atomic(pmap);
-}
-
-static int nvme_noop_verify(struct blk_integrity_iter *iter) -{
- return 0;
-}
-
-static int nvme_noop_generate(struct blk_integrity_iter *iter) -{
- return 0;
-}
-
-struct blk_integrity nvme_meta_noop = {
- .name = "NVME_META_NOOP",
- .generate_fn = nvme_noop_generate,
- .verify_fn = nvme_noop_verify,
-};
-
-static void nvme_init_integrity(struct nvme_ns *ns)
-{
- struct blk_integrity integrity;
-
- switch (ns->pi_type) {
- case NVME_NS_DPS_PI_TYPE3:
- integrity = t10_pi_type3_crc;
- break;
- case NVME_NS_DPS_PI_TYPE1:
- case NVME_NS_DPS_PI_TYPE2:
- integrity = t10_pi_type1_crc;
- break;
- default:
- integrity = nvme_meta_noop;
- break;
- }
- integrity.tuple_size = ns->ms;
- blk_integrity_register(ns->disk, &integrity);
- blk_queue_max_integrity_segments(ns->queue, 1);
-}
-#else /* CONFIG_BLK_DEV_INTEGRITY */
-static void nvme_dif_remap(struct request *req,
- void (*dif_swap)(u32 p, u32 v, struct
t10_pi_tuple *pi))
-{
-}
-static void nvme_dif_prep(u32 p, u32 v, struct t10_pi_tuple *pi) -{
-}
-static void nvme_dif_complete(u32 p, u32 v, struct t10_pi_tuple *pi) -{
-}
-static void nvme_init_integrity(struct nvme_ns *ns)
-{
-}
-#endif
-
-static void req_completion(struct nvme_queue *nvmeq, void *ctx,
- struct nvme_completion
*cqe)
-{
- struct nvme_iod *iod = ctx;
- struct request *req = iod_get_private(iod);
- struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
-
- u16 status = le16_to_cpup(&cqe->status) >> 1;
-
- if (unlikely(status)) {
- if (!(status & NVME_SC_DNR ||
blk_noretry_request(req))
- && (jiffies - req->start_time) < req->timeout) {
- unsigned long flags;
-
- blk_mq_requeue_request(req);
- spin_lock_irqsave(req->q->queue_lock, flags);
- if (!blk_queue_stopped(req->q))
- blk_mq_kick_requeue_list(req->q);
- spin_unlock_irqrestore(req->q->queue_lock,
flags);
- return;
- }
- if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
- if (cmd_rq->ctx == CMD_CTX_CANCELLED)
- req->errors = -EINTR;
- else
- req->errors = status;
- } else {
- req->errors = nvme_error_status(status);
- }
- } else
- req->errors = 0;
- if (req->cmd_type == REQ_TYPE_DRV_PRIV) {
- u32 result = le32_to_cpup(&cqe->result);
- req->special = (void *)(uintptr_t)result;
- }
-
- if (cmd_rq->aborted)
- dev_warn(nvmeq->dev->dev,
- "completing aborted command with
status:%04x\n",
- status);
-
- if (iod->nents) {
- dma_unmap_sg(nvmeq->dev->dev, iod->sg, iod->nents,
- rq_data_dir(req) ? DMA_TO_DEVICE :
DMA_FROM_DEVICE);
- if (blk_integrity_rq(req)) {
- if (!rq_data_dir(req))
- nvme_dif_remap(req,
nvme_dif_complete);
- dma_unmap_sg(nvmeq->dev->dev, iod->meta_sg, 1,
- rq_data_dir(req) ? DMA_TO_DEVICE :
DMA_FROM_DEVICE);
- }
- }
- nvme_free_iod(nvmeq->dev, iod);
-
- blk_mq_complete_request(req);
-}
-
-/* length is in bytes. gfp flags indicates whether we may sleep. */ -static int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
- int total_len, gfp_t gfp)
-{
- struct dma_pool *pool;
- int length = total_len;
- struct scatterlist *sg = iod->sg;
- int dma_len = sg_dma_len(sg);
- u64 dma_addr = sg_dma_address(sg);
- u32 page_size = dev->page_size;
- int offset = dma_addr & (page_size - 1);
- __le64 *prp_list;
- __le64 **list = iod_list(iod);
- dma_addr_t prp_dma;
- int nprps, i;
-
- length -= (page_size - offset);
- if (length <= 0)
- return total_len;
-
- dma_len -= (page_size - offset);
- if (dma_len) {
- dma_addr += (page_size - offset);
- } else {
- sg = sg_next(sg);
- dma_addr = sg_dma_address(sg);
- dma_len = sg_dma_len(sg);
- }
-
- if (length <= page_size) {
- iod->first_dma = dma_addr;
- return total_len;
- }
-
- nprps = DIV_ROUND_UP(length, page_size);
- if (nprps <= (256 / 8)) {
- pool = dev->prp_small_pool;
- iod->npages = 0;
- } else {
- pool = dev->prp_page_pool;
- iod->npages = 1;
- }
-
- prp_list = dma_pool_alloc(pool, gfp, &prp_dma);
- if (!prp_list) {
- iod->first_dma = dma_addr;
- iod->npages = -1;
- return (total_len - length) + page_size;
- }
- list[0] = prp_list;
- iod->first_dma = prp_dma;
- i = 0;
- for (;;) {
- if (i == page_size >> 3) {
- __le64 *old_prp_list = prp_list;
- prp_list = dma_pool_alloc(pool, gfp,
&prp_dma);
- if (!prp_list)
- return total_len - length;
- list[iod->npages++] = prp_list;
- prp_list[0] = old_prp_list[i - 1];
- old_prp_list[i - 1] = cpu_to_le64(prp_dma);
- i = 1;
- }
- prp_list[i++] = cpu_to_le64(dma_addr);
- dma_len -= page_size;
- dma_addr += page_size;
- length -= page_size;
- if (length <= 0)
- break;
- if (dma_len > 0)
- continue;
- BUG_ON(dma_len < 0);
- sg = sg_next(sg);
- dma_addr = sg_dma_address(sg);
- dma_len = sg_dma_len(sg);
- }
-
- return total_len;
-}
-
-static void nvme_submit_priv(struct nvme_queue *nvmeq, struct request *req,
- struct nvme_iod *iod)
-{
- struct nvme_command cmnd;
-
- memcpy(&cmnd, req->cmd, sizeof(cmnd));
- cmnd.rw.command_id = req->tag;
- if (req->nr_phys_segments) {
- cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
- cmnd.rw.prp2 = cpu_to_le64(iod->first_dma);
- }
-
- __nvme_submit_cmd(nvmeq, &cmnd);
-}
-
-/*
- * We reuse the small pool to allocate the 16-byte range here as it is not
- * worth having a special pool for these or additional cases to handle freeing
- * the iod.
- */
-static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
- struct request *req, struct nvme_iod *iod)
-{
- struct nvme_dsm_range *range =
- (struct nvme_dsm_range
*)iod_list(iod)[0];
- struct nvme_command cmnd;
-
- range->cattr = cpu_to_le32(0);
- range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift);
- range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
-
- memset(&cmnd, 0, sizeof(cmnd));
- cmnd.dsm.opcode = nvme_cmd_dsm;
- cmnd.dsm.command_id = req->tag;
- cmnd.dsm.nsid = cpu_to_le32(ns->ns_id);
- cmnd.dsm.prp1 = cpu_to_le64(iod->first_dma);
- cmnd.dsm.nr = 0;
- cmnd.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD);
-
- __nvme_submit_cmd(nvmeq, &cmnd);
-}
-
-static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
- int
cmdid)
-{
- struct nvme_command cmnd;
-
- memset(&cmnd, 0, sizeof(cmnd));
- cmnd.common.opcode = nvme_cmd_flush;
- cmnd.common.command_id = cmdid;
- cmnd.common.nsid = cpu_to_le32(ns->ns_id);
-
- __nvme_submit_cmd(nvmeq, &cmnd);
-}
-
-static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
- struct nvme_ns
*ns)
-{
- struct request *req = iod_get_private(iod);
- struct nvme_command cmnd;
- u16 control = 0;
- u32 dsmgmt = 0;
-
- if (req->cmd_flags & REQ_FUA)
- control |= NVME_RW_FUA;
- if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD))
- control |= NVME_RW_LR;
-
- if (req->cmd_flags & REQ_RAHEAD)
- dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH;
-
- memset(&cmnd, 0, sizeof(cmnd));
- cmnd.rw.opcode = (rq_data_dir(req) ? nvme_cmd_write :
nvme_cmd_read);
- cmnd.rw.command_id = req->tag;
- cmnd.rw.nsid = cpu_to_le32(ns->ns_id);
- cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
- cmnd.rw.prp2 = cpu_to_le64(iod->first_dma);
- cmnd.rw.slba = cpu_to_le64(nvme_block_nr(ns,
blk_rq_pos(req)));
- cmnd.rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns
->lba_shift) - 1);
-
- if (ns->ms) {
- switch (ns->pi_type) {
- case NVME_NS_DPS_PI_TYPE3:
- control |= NVME_RW_PRINFO_PRCHK_GUARD;
- break;
- case NVME_NS_DPS_PI_TYPE1:
- case NVME_NS_DPS_PI_TYPE2:
- control |= NVME_RW_PRINFO_PRCHK_GUARD |
- NVME_RW_PRINFO_PRCHK_REF;
- cmnd.rw.reftag = cpu_to_le32(
- nvme_block_nr(ns,
blk_rq_pos(req)));
- break;
- }
- if (blk_integrity_rq(req))
- cmnd.rw.metadata =
- cpu_to_le64(sg_dma_address(iod
->meta_sg));
- else
- control |= NVME_RW_PRINFO_PRACT;
- }
-
- cmnd.rw.control = cpu_to_le16(control);
- cmnd.rw.dsmgmt = cpu_to_le32(dsmgmt);
-
- __nvme_submit_cmd(nvmeq, &cmnd);
-
- return 0;
-}
-
-/*
- * NOTE: ns is NULL when called on the admin queue.
- */
-static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
- const struct blk_mq_queue_data *bd)
-{
- struct nvme_ns *ns = hctx->queue->queuedata;
- struct nvme_queue *nvmeq = hctx->driver_data;
- struct nvme_dev *dev = nvmeq->dev;
- struct request *req = bd->rq;
- struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
- struct nvme_iod *iod;
- enum dma_data_direction dma_dir;
-
- /*
- * If formated with metadata, require the block layer provide
a buffer
- * unless this namespace is formated such that the metadata
can be
- * stripped/generated by the controller with PRACT=1.
- */
- if (ns && ns->ms && !blk_integrity_rq(req)) {
- if (!(ns->pi_type && ns->ms == 8) &&
- req->cmd_type !=
REQ_TYPE_DRV_PRIV) {
- req->errors = -EFAULT;
- blk_mq_complete_request(req);
- return BLK_MQ_RQ_QUEUE_OK;
- }
- }
-
- iod = nvme_alloc_iod(req, dev, GFP_ATOMIC);
- if (!iod)
- return BLK_MQ_RQ_QUEUE_BUSY;
-
- if (req->cmd_flags & REQ_DISCARD) {
- void *range;
- /*
- * We reuse the small pool to allocate the 16-byte
range here
- * as it is not worth having a special pool for these
or
- * additional cases to handle freeing the iod.
- */
- range = dma_pool_alloc(dev->prp_small_pool,
GFP_ATOMIC,
- &iod->first_dma);
- if (!range)
- goto retry_cmd;
- iod_list(iod)[0] = (__le64 *)range;
- iod->npages = 0;
- } else if (req->nr_phys_segments) {
- dma_dir = rq_data_dir(req) ? DMA_TO_DEVICE :
DMA_FROM_DEVICE;
-
- sg_init_table(iod->sg, req->nr_phys_segments);
- iod->nents = blk_rq_map_sg(req->q, req, iod->sg);
- if (!iod->nents)
- goto error_cmd;
-
- if (!dma_map_sg(nvmeq->q_dmadev, iod->sg, iod->nents,
dma_dir))
- goto retry_cmd;
-
- if (blk_rq_bytes(req) !=
- nvme_setup_prps(dev, iod, blk_rq_bytes(req),
GFP_ATOMIC)) {
- dma_unmap_sg(dev->dev, iod->sg, iod->nents,
dma_dir);
- goto retry_cmd;
- }
- if (blk_integrity_rq(req)) {
- if (blk_rq_count_integrity_sg(req->q, req
->bio) != 1)
- goto error_cmd;
-
- sg_init_table(iod->meta_sg, 1);
- if (blk_rq_map_integrity_sg(
- req->q, req->bio, iod
->meta_sg) != 1)
- goto error_cmd;
-
- if (rq_data_dir(req))
- nvme_dif_remap(req, nvme_dif_prep);
-
- if (!dma_map_sg(nvmeq->q_dmadev, iod->meta_sg,
1, dma_dir))
- goto error_cmd;
- }
- }
-
- nvme_set_info(cmd, iod, req_completion);
- spin_lock_irq(&nvmeq->q_lock);
- if (req->cmd_type == REQ_TYPE_DRV_PRIV)
- nvme_submit_priv(nvmeq, req, iod);
- else if (req->cmd_flags & REQ_DISCARD)
- nvme_submit_discard(nvmeq, ns, req, iod);
- else if (req->cmd_flags & REQ_FLUSH)
- nvme_submit_flush(nvmeq, ns, req->tag);
- else
- nvme_submit_iod(nvmeq, iod, ns);
-
- nvme_process_cq(nvmeq);
- spin_unlock_irq(&nvmeq->q_lock);
- return BLK_MQ_RQ_QUEUE_OK;
-
- error_cmd:
- nvme_free_iod(dev, iod);
- return BLK_MQ_RQ_QUEUE_ERROR;
- retry_cmd:
- nvme_free_iod(dev, iod);
- return BLK_MQ_RQ_QUEUE_BUSY;
-}
-
-static int nvme_process_cq(struct nvme_queue *nvmeq)
-{
- u16 head, phase;
-
- head = nvmeq->cq_head;
- phase = nvmeq->cq_phase;
-
- for (;;) {
- void *ctx;
- nvme_completion_fn fn;
- struct nvme_completion cqe = nvmeq->cqes[head];
- if ((le16_to_cpu(cqe.status) & 1) != phase)
- break;
- nvmeq->sq_head = le16_to_cpu(cqe.sq_head);
- if (++head == nvmeq->q_depth) {
- head = 0;
- phase = !phase;
- }
- ctx = nvme_finish_cmd(nvmeq, cqe.command_id, &fn);
- fn(nvmeq, ctx, &cqe);
- }
-
- /* If the controller ignores the cq head doorbell and
continuously
- * writes to the queue, it is theoretically possible to wrap
around
- * the queue twice and mistakenly return IRQ_NONE. Linux only
- * requires that 0.1% of your interrupts are handled, so this
isn't
- * a big problem.
- */
- if (head == nvmeq->cq_head && phase == nvmeq->cq_phase)
- return 0;
-
- writel(head, nvmeq->q_db + nvmeq->dev->db_stride);
- nvmeq->cq_head = head;
- nvmeq->cq_phase = phase;
-
- nvmeq->cqe_seen = 1;
- return 1;
-}
-
-static irqreturn_t nvme_irq(int irq, void *data)
-{
- irqreturn_t result;
- struct nvme_queue *nvmeq = data;
- spin_lock(&nvmeq->q_lock);
- nvme_process_cq(nvmeq);
- result = nvmeq->cqe_seen ? IRQ_HANDLED : IRQ_NONE;
- nvmeq->cqe_seen = 0;
- spin_unlock(&nvmeq->q_lock);
- return result;
-}
-
-static irqreturn_t nvme_irq_check(int irq, void *data)
-{
- struct nvme_queue *nvmeq = data;
- struct nvme_completion cqe = nvmeq->cqes[nvmeq->cq_head];
- if ((le16_to_cpu(cqe.status) & 1) != nvmeq->cq_phase)
- return IRQ_NONE;
- return IRQ_WAKE_THREAD;
-}
-
-/*
- * Returns 0 on success. If the result is negative, it's a Linux error code;
- * if the result is positive, it's an NVM Express status code
- */
-int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
- void *buffer, void __user *ubuffer, unsigned bufflen,
- u32 *result, unsigned timeout)
-{
- bool write = cmd->common.opcode & 1;
- struct bio *bio = NULL;
- struct request *req;
- int ret;
-
- req = blk_mq_alloc_request(q, write, GFP_KERNEL, false);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->cmd_type = REQ_TYPE_DRV_PRIV;
- req->cmd_flags |= REQ_FAILFAST_DRIVER;
- req->__data_len = 0;
- req->__sector = (sector_t) -1;
- req->bio = req->biotail = NULL;
-
- req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
-
- req->cmd = (unsigned char *)cmd;
- req->cmd_len = sizeof(struct nvme_command);
- req->special = (void *)0;
-
- if (buffer && bufflen) {
- ret = blk_rq_map_kern(q, req, buffer, bufflen,
__GFP_WAIT);
- if (ret)
- goto out;
- } else if (ubuffer && bufflen) {
- ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
__GFP_WAIT);
- if (ret)
- goto out;
- bio = req->bio;
- }
-
- blk_execute_rq(req->q, NULL, req, 0);
- if (bio)
- blk_rq_unmap_user(bio);
- if (result)
- *result = (u32)(uintptr_t)req->special;
- ret = req->errors;
- out:
- blk_mq_free_request(req);
- return ret;
-}
-
-int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
- void *buffer, unsigned bufflen)
-{
- return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen,
NULL, 0);
-}
-
-static int nvme_submit_async_admin_req(struct nvme_dev *dev) -{
- struct nvme_queue *nvmeq = dev->queues[0];
- struct nvme_command c;
- struct nvme_cmd_info *cmd_info;
- struct request *req;
-
- req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_ATOMIC,
true);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->cmd_flags |= REQ_NO_TIMEOUT;
- cmd_info = blk_mq_rq_to_pdu(req);
- nvme_set_info(cmd_info, NULL, async_req_completion);
-
- memset(&c, 0, sizeof(c));
- c.common.opcode = nvme_admin_async_event;
- c.common.command_id = req->tag;
-
- blk_mq_free_request(req);
- __nvme_submit_cmd(nvmeq, &c);
- return 0;
-}
-
-static int nvme_submit_admin_async_cmd(struct nvme_dev *dev,
- struct nvme_command *cmd,
- struct async_cmd_info *cmdinfo, unsigned
timeout)
-{
- struct nvme_queue *nvmeq = dev->queues[0];
- struct request *req;
- struct nvme_cmd_info *cmd_rq;
-
- req = blk_mq_alloc_request(dev->admin_q, WRITE, GFP_KERNEL,
false);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->timeout = timeout;
- cmd_rq = blk_mq_rq_to_pdu(req);
- cmdinfo->req = req;
- nvme_set_info(cmd_rq, cmdinfo, async_completion);
- cmdinfo->status = -EINTR;
-
- cmd->common.command_id = req->tag;
-
- nvme_submit_cmd(nvmeq, cmd);
- return 0;
-}
-
-static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.delete_queue.opcode = opcode;
- c.delete_queue.qid = cpu_to_le16(id);
-
- return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0);
-}
-
-static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
- struct nvme_queue
*nvmeq)
-{
- struct nvme_command c;
- int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED;
-
- /*
- * Note: we (ab)use the fact the the prp fields survive if no
data
- * is attached to the request.
- */
- memset(&c, 0, sizeof(c));
- c.create_cq.opcode = nvme_admin_create_cq;
- c.create_cq.prp1 = cpu_to_le64(nvmeq->cq_dma_addr);
- c.create_cq.cqid = cpu_to_le16(qid);
- c.create_cq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
- c.create_cq.cq_flags = cpu_to_le16(flags);
- c.create_cq.irq_vector = cpu_to_le16(nvmeq->cq_vector);
-
- return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0);
-}
-
-static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
- struct nvme_queue
*nvmeq)
-{
- struct nvme_command c;
- int flags = NVME_QUEUE_PHYS_CONTIG | NVME_SQ_PRIO_MEDIUM;
-
- /*
- * Note: we (ab)use the fact the the prp fields survive if no
data
- * is attached to the request.
- */
- memset(&c, 0, sizeof(c));
- c.create_sq.opcode = nvme_admin_create_sq;
- c.create_sq.prp1 = cpu_to_le64(nvmeq->sq_dma_addr);
- c.create_sq.sqid = cpu_to_le16(qid);
- c.create_sq.qsize = cpu_to_le16(nvmeq->q_depth - 1);
- c.create_sq.sq_flags = cpu_to_le16(flags);
- c.create_sq.cqid = cpu_to_le16(qid);
-
- return nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0);
-}
-
-static int adapter_delete_cq(struct nvme_dev *dev, u16 cqid) -{
- return adapter_delete_queue(dev, nvme_admin_delete_cq, cqid);
-}
-
-static int adapter_delete_sq(struct nvme_dev *dev, u16 sqid) -{
- return adapter_delete_queue(dev, nvme_admin_delete_sq, sqid);
-}
-
-int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id) -{
- struct nvme_command c = { };
- int error;
-
- /* gcc-4.4.4 (at least) has issues with initializers and anon
unions */
- c.identify.opcode = nvme_admin_identify;
- c.identify.cns = cpu_to_le32(1);
-
- *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
- if (!*id)
- return -ENOMEM;
-
- error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
- sizeof(struct nvme_id_ctrl));
- if (error)
- kfree(*id);
- return error;
-}
-
-int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid,
- struct nvme_id_ns **id)
-{
- struct nvme_command c = { };
- int error;
-
- /* gcc-4.4.4 (at least) has issues with initializers and anon
unions */
- c.identify.opcode = nvme_admin_identify,
- c.identify.nsid = cpu_to_le32(nsid),
-
- *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
- if (!*id)
- return -ENOMEM;
-
- error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
- sizeof(struct nvme_id_ns));
- if (error)
- kfree(*id);
- return error;
-}
-
-int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
- dma_addr_t dma_addr, u32
*result)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.features.opcode = nvme_admin_get_features;
- c.features.nsid = cpu_to_le32(nsid);
- c.features.prp1 = cpu_to_le64(dma_addr);
- c.features.fid = cpu_to_le32(fid);
-
- return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
- result, 0);
-}
-
-int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
- dma_addr_t dma_addr, u32
*result)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.features.opcode = nvme_admin_set_features;
- c.features.prp1 = cpu_to_le64(dma_addr);
- c.features.fid = cpu_to_le32(fid);
- c.features.dword11 = cpu_to_le32(dword11);
-
- return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
- result, 0);
-}
-
-int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log)
-{
- struct nvme_command c = { };
- int error;
-
- c.common.opcode = nvme_admin_get_log_page,
- c.common.nsid = cpu_to_le32(0xFFFFFFFF),
- c.common.cdw10[0] = cpu_to_le32(
- (((sizeof(struct nvme_smart_log) / 4) - 1) <<
16) |
- NVME_LOG_SMART),
-
- *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
- if (!*log)
- return -ENOMEM;
-
- error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
- sizeof(struct nvme_smart_log));
- if (error)
- kfree(*log);
- return error;
-}
-
-/**
- * nvme_abort_req - Attempt aborting a request
- *
- * Schedule controller reset if the command was already aborted once before and
- * still hasn't been returned to the driver, or if this is the admin queue.
- */
-static void nvme_abort_req(struct request *req)
-{
- struct nvme_cmd_info *cmd_rq = blk_mq_rq_to_pdu(req);
- struct nvme_queue *nvmeq = cmd_rq->nvmeq;
- struct nvme_dev *dev = nvmeq->dev;
- struct request *abort_req;
- struct nvme_cmd_info *abort_cmd;
- struct nvme_command cmd;
-
- if (!nvmeq->qid || cmd_rq->aborted) {
- unsigned long flags;
-
- spin_lock_irqsave(&dev_list_lock, flags);
- if (work_busy(&dev->reset_work))
- goto out;
- list_del_init(&dev->node);
- dev_warn(dev->dev, "I/O %d QID %d timeout, reset
controller\n",
- req->tag,
nvmeq->qid);
- dev->reset_workfn = nvme_reset_failed_dev;
- queue_work(nvme_workq, &dev->reset_work);
- out:
- spin_unlock_irqrestore(&dev_list_lock, flags);
- return;
- }
-
- if (!dev->abort_limit)
- return;
-
- abort_req = blk_mq_alloc_request(dev->admin_q, WRITE,
GFP_ATOMIC,
- false);
- if (IS_ERR(abort_req))
- return;
-
- abort_cmd = blk_mq_rq_to_pdu(abort_req);
- nvme_set_info(abort_cmd, abort_req, abort_completion);
-
- memset(&cmd, 0, sizeof(cmd));
- cmd.abort.opcode = nvme_admin_abort_cmd;
- cmd.abort.cid = req->tag;
- cmd.abort.sqid = cpu_to_le16(nvmeq->qid);
- cmd.abort.command_id = abort_req->tag;
-
- --dev->abort_limit;
- cmd_rq->aborted = 1;
-
- dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", req
->tag,
- nvmeq->qid);
- nvme_submit_cmd(dev->queues[0], &cmd);
-}
-
-static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved)
-{
- struct nvme_queue *nvmeq = data;
- void *ctx;
- nvme_completion_fn fn;
- struct nvme_cmd_info *cmd;
- struct nvme_completion cqe;
-
- if (!blk_mq_request_started(req))
- return;
-
- cmd = blk_mq_rq_to_pdu(req);
-
- if (cmd->ctx == CMD_CTX_CANCELLED)
- return;
-
- if (blk_queue_dying(req->q))
- cqe.status = cpu_to_le16((NVME_SC_ABORT_REQ |
NVME_SC_DNR) << 1);
- else
- cqe.status = cpu_to_le16(NVME_SC_ABORT_REQ << 1);
-
-
- dev_warn(nvmeq->q_dmadev, "Cancelling I/O %d QID %d\n",
- req->tag, nvmeq->qid);
- ctx = cancel_cmd_info(cmd, &fn);
- fn(nvmeq, ctx, &cqe);
-}
-
-static enum blk_eh_timer_return nvme_timeout(struct request *req, bool reserved)
-{
- struct nvme_cmd_info *cmd = blk_mq_rq_to_pdu(req);
- struct nvme_queue *nvmeq = cmd->nvmeq;
-
- dev_warn(nvmeq->q_dmadev, "Timeout I/O %d QID %d\n", req->tag,
- nvmeq->qid);
- spin_lock_irq(&nvmeq->q_lock);
- nvme_abort_req(req);
- spin_unlock_irq(&nvmeq->q_lock);
-
- /*
- * The aborted req will be completed on receiving the abort
req.
- * We enable the timer again. If hit twice, it'll cause a
device reset,
- * as the device then is in a faulty state.
- */
- return BLK_EH_RESET_TIMER;
-}
-
-static void nvme_free_queue(struct nvme_queue *nvmeq)
-{
- dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth),
- (void *)nvmeq->cqes, nvmeq
->cq_dma_addr);
- if (nvmeq->sq_cmds)
- dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq
->q_depth),
- nvmeq->sq_cmds, nvmeq
->sq_dma_addr);
- kfree(nvmeq);
-}
-
-static void nvme_free_queues(struct nvme_dev *dev, int lowest) -{
- int i;
-
- for (i = dev->queue_count - 1; i >= lowest; i--) {
- struct nvme_queue *nvmeq = dev->queues[i];
- dev->queue_count--;
- dev->queues[i] = NULL;
- nvme_free_queue(nvmeq);
- }
-}
-
-/**
- * nvme_suspend_queue - put queue into suspended state
- * @nvmeq - queue to suspend
- */
-static int nvme_suspend_queue(struct nvme_queue *nvmeq)
-{
- int vector;
-
- spin_lock_irq(&nvmeq->q_lock);
- if (nvmeq->cq_vector == -1) {
- spin_unlock_irq(&nvmeq->q_lock);
- return 1;
- }
- vector = nvmeq->dev->entry[nvmeq->cq_vector].vector;
- nvmeq->dev->online_queues--;
- nvmeq->cq_vector = -1;
- spin_unlock_irq(&nvmeq->q_lock);
-
- if (!nvmeq->qid && nvmeq->dev->admin_q)
- blk_mq_freeze_queue_start(nvmeq->dev->admin_q);
-
- irq_set_affinity_hint(vector, NULL);
- free_irq(vector, nvmeq);
-
- return 0;
-}
-
-static void nvme_clear_queue(struct nvme_queue *nvmeq)
-{
- spin_lock_irq(&nvmeq->q_lock);
- if (nvmeq->tags && *nvmeq->tags)
- blk_mq_all_tag_busy_iter(*nvmeq->tags,
nvme_cancel_queue_ios, nvmeq);
- spin_unlock_irq(&nvmeq->q_lock);
-}
-
-static void nvme_disable_queue(struct nvme_dev *dev, int qid) -{
- struct nvme_queue *nvmeq = dev->queues[qid];
-
- if (!nvmeq)
- return;
- if (nvme_suspend_queue(nvmeq))
- return;
-
- /* Don't tell the adapter to delete the admin queue.
- * Don't tell a removed adapter to delete IO queues. */
- if (qid && readl(&dev->bar->csts) != -1) {
- adapter_delete_sq(dev, qid);
- adapter_delete_cq(dev, qid);
- }
-
- spin_lock_irq(&nvmeq->q_lock);
- nvme_process_cq(nvmeq);
- spin_unlock_irq(&nvmeq->q_lock);
-}
-
-static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
- int entry_size)
-{
- int q_depth = dev->q_depth;
- unsigned q_size_aligned = roundup(q_depth * entry_size, dev
->page_size);
-
- if (q_size_aligned * nr_io_queues > dev->cmb_size) {
- u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
- mem_per_q = round_down(mem_per_q, dev->page_size);
- q_depth = div_u64(mem_per_q, entry_size);
-
- /*
- * Ensure the reduced q_depth is above some threshold
where it
- * would be better to map queues in system memory with
the
- * original depth
- */
- if (q_depth < 64)
- return -ENOMEM;
- }
-
- return q_depth;
-}
-
-static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq,
- int qid, int depth)
-{
- if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev
->cmbsz)) {
- unsigned offset = (qid - 1) *
- roundup(SQ_SIZE(depth), dev
->page_size);
- nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset;
- nvmeq->sq_cmds_io = dev->cmb + offset;
- } else {
- nvmeq->sq_cmds = dma_alloc_coherent(dev->dev,
SQ_SIZE(depth),
- &nvmeq->sq_dma_addr,
GFP_KERNEL);
- if (!nvmeq->sq_cmds)
- return -ENOMEM;
- }
-
- return 0;
-}
-
-static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid,
- int depth)
-{
- struct nvme_queue *nvmeq = kzalloc(sizeof(*nvmeq),
GFP_KERNEL);
- if (!nvmeq)
- return NULL;
-
- nvmeq->cqes = dma_zalloc_coherent(dev->dev, CQ_SIZE(depth),
- &nvmeq->cq_dma_addr,
GFP_KERNEL);
- if (!nvmeq->cqes)
- goto free_nvmeq;
-
- if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth))
- goto free_cqdma;
-
- nvmeq->q_dmadev = dev->dev;
- nvmeq->dev = dev;
- snprintf(nvmeq->irqname, sizeof(nvmeq->irqname), "nvme%dq%d",
- dev->instance, qid);
- spin_lock_init(&nvmeq->q_lock);
- nvmeq->cq_head = 0;
- nvmeq->cq_phase = 1;
- nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
- nvmeq->q_depth = depth;
- nvmeq->qid = qid;
- nvmeq->cq_vector = -1;
- dev->queues[qid] = nvmeq;
-
- /* make sure queue descriptor is set before queue count, for
kthread */
- mb();
- dev->queue_count++;
-
- return nvmeq;
-
- free_cqdma:
- dma_free_coherent(dev->dev, CQ_SIZE(depth), (void *)nvmeq
->cqes,
- nvmeq
->cq_dma_addr);
- free_nvmeq:
- kfree(nvmeq);
- return NULL;
-}
-
-static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq,
- const char
*name)
-{
- if (use_threaded_interrupts)
- return request_threaded_irq(dev->entry[nvmeq
->cq_vector].vector,
- nvme_irq_check, nvme_irq,
IRQF_SHARED,
- name, nvmeq);
- return request_irq(dev->entry[nvmeq->cq_vector].vector,
nvme_irq,
- IRQF_SHARED, name, nvmeq);
-}
-
-static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) -{
- struct nvme_dev *dev = nvmeq->dev;
-
- spin_lock_irq(&nvmeq->q_lock);
- nvmeq->sq_tail = 0;
- nvmeq->cq_head = 0;
- nvmeq->cq_phase = 1;
- nvmeq->q_db = &dev->dbs[qid * 2 * dev->db_stride];
- memset((void *)nvmeq->cqes, 0, CQ_SIZE(nvmeq->q_depth));
- dev->online_queues++;
- spin_unlock_irq(&nvmeq->q_lock);
-}
-
-static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) -{
- struct nvme_dev *dev = nvmeq->dev;
- int result;
-
- nvmeq->cq_vector = qid - 1;
- result = adapter_alloc_cq(dev, qid, nvmeq);
- if (result < 0)
- return result;
-
- result = adapter_alloc_sq(dev, qid, nvmeq);
- if (result < 0)
- goto release_cq;
-
- result = queue_request_irq(dev, nvmeq, nvmeq->irqname);
- if (result < 0)
- goto release_sq;
-
- nvme_init_queue(nvmeq, qid);
- return result;
-
- release_sq:
- adapter_delete_sq(dev, qid);
- release_cq:
- adapter_delete_cq(dev, qid);
- return result;
-}
-
-static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled)
-{
- unsigned long timeout;
- u32 bit = enabled ? NVME_CSTS_RDY : 0;
-
- timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
-
- while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) {
- msleep(100);
- if (fatal_signal_pending(current))
- return -EINTR;
- if (time_after(jiffies, timeout)) {
- dev_err(dev->dev,
- "Device not ready; aborting %s\n",
enabled ?
- "initialisation" :
"reset");
- return -ENODEV;
- }
- }
-
- return 0;
-}
-
-/*
- * If the device has been passed off to us in an enabled state, just clear
- * the enabled bit. The spec says we should set the 'shutdown notification
- * bits', but doing so may cause the device to complete commands to the
- * admin queue ... and we don't know what memory that might be pointing at!
- */
-static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap) -{
- dev->ctrl_config &= ~NVME_CC_SHN_MASK;
- dev->ctrl_config &= ~NVME_CC_ENABLE;
- writel(dev->ctrl_config, &dev->bar->cc);
-
- return nvme_wait_ready(dev, cap, false);
-}
-
-static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap) -{
- dev->ctrl_config &= ~NVME_CC_SHN_MASK;
- dev->ctrl_config |= NVME_CC_ENABLE;
- writel(dev->ctrl_config, &dev->bar->cc);
-
- return nvme_wait_ready(dev, cap, true);
-}
-
-static int nvme_shutdown_ctrl(struct nvme_dev *dev)
-{
- unsigned long timeout;
-
- dev->ctrl_config &= ~NVME_CC_SHN_MASK;
- dev->ctrl_config |= NVME_CC_SHN_NORMAL;
-
- writel(dev->ctrl_config, &dev->bar->cc);
-
- timeout = SHUTDOWN_TIMEOUT + jiffies;
- while ((readl(&dev->bar->csts) & NVME_CSTS_SHST_MASK) !=
- NVME_CSTS_SHST
_CMPLT) {
- msleep(100);
- if (fatal_signal_pending(current))
- return -EINTR;
- if (time_after(jiffies, timeout)) {
- dev_err(dev->dev,
- "Device shutdown incomplete; abort
shutdown\n");
- return -ENODEV;
- }
- }
-
- return 0;
-}
-
-static struct blk_mq_ops nvme_mq_admin_ops = {
- .queue_rq = nvme_queue_rq,
- .map_queue = blk_mq_map_queue,
- .init_hctx = nvme_admin_init_hctx,
- .exit_hctx = nvme_admin_exit_hctx,
- .init_request = nvme_admin_init_request,
- .timeout = nvme_timeout,
-};
-
-static struct blk_mq_ops nvme_mq_ops = {
- .queue_rq = nvme_queue_rq,
- .map_queue = blk_mq_map_queue,
- .init_hctx = nvme_init_hctx,
- .init_request = nvme_init_request,
- .timeout = nvme_timeout,
-};
-
-static void nvme_dev_remove_admin(struct nvme_dev *dev)
-{
- if (dev->admin_q && !blk_queue_dying(dev->admin_q)) {
- blk_cleanup_queue(dev->admin_q);
- blk_mq_free_tag_set(&dev->admin_tagset);
- }
-}
-
-static int nvme_alloc_admin_tags(struct nvme_dev *dev)
-{
- if (!dev->admin_q) {
- dev->admin_tagset.ops = &nvme_mq_admin_ops;
- dev->admin_tagset.nr_hw_queues = 1;
- dev->admin_tagset.queue_depth = NVME_AQ_DEPTH - 1;
- dev->admin_tagset.reserved_tags = 1;
- dev->admin_tagset.timeout = ADMIN_TIMEOUT;
- dev->admin_tagset.numa_node = dev_to_node(dev->dev);
- dev->admin_tagset.cmd_size = nvme_cmd_size(dev);
- dev->admin_tagset.driver_data = dev;
-
- if (blk_mq_alloc_tag_set(&dev->admin_tagset))
- return -ENOMEM;
-
- dev->admin_q = blk_mq_init_queue(&dev->admin_tagset);
- if (IS_ERR(dev->admin_q)) {
- blk_mq_free_tag_set(&dev->admin_tagset);
- return -ENOMEM;
- }
- if (!blk_get_queue(dev->admin_q)) {
- nvme_dev_remove_admin(dev);
- dev->admin_q = NULL;
- return -ENODEV;
- }
- } else
- blk_mq_unfreeze_queue(dev->admin_q);
-
- return 0;
-}
-
-static int nvme_configure_admin_queue(struct nvme_dev *dev) -{
- int result;
- u32 aqa;
- u64 cap = readq(&dev->bar->cap);
- struct nvme_queue *nvmeq;
- unsigned page_shift = PAGE_SHIFT;
- unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12;
- unsigned dev_page_max = NVME_CAP_MPSMAX(cap) + 12;
-
- if (page_shift < dev_page_min) {
- dev_err(dev->dev,
- "Minimum device page size (%u) too
large for "
- "host (%u)\n", 1 << dev_page_min,
- 1 << page_shift);
- return -ENODEV;
- }
- if (page_shift > dev_page_max) {
- dev_info(dev->dev,
- "Device maximum page size (%u) smaller
than "
- "host (%u); enabling work-around\n",
- 1 << dev_page_max, 1 << page_shift);
- page_shift = dev_page_max;
- }
-
- dev->subsystem = readl(&dev->bar->vs) >= NVME_VS(1, 1) ?
- NVME_CAP_NSSRC(cap) :
0;
-
- if (dev->subsystem && (readl(&dev->bar->csts) &
NVME_CSTS_NSSRO))
- writel(NVME_CSTS_NSSRO, &dev->bar->csts);
-
- result = nvme_disable_ctrl(dev, cap);
- if (result < 0)
- return result;
-
- nvmeq = dev->queues[0];
- if (!nvmeq) {
- nvmeq = nvme_alloc_queue(dev, 0, NVME_AQ_DEPTH);
- if (!nvmeq)
- return -ENOMEM;
- }
-
- aqa = nvmeq->q_depth - 1;
- aqa |= aqa << 16;
-
- dev->page_size = 1 << page_shift;
-
- dev->ctrl_config = NVME_CC_CSS_NVM;

-	dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
-	dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
-	dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;

-
- writel(aqa, &dev->bar->aqa);
- writeq(nvmeq->sq_dma_addr, &dev->bar->asq);
- writeq(nvmeq->cq_dma_addr, &dev->bar->acq);
-
- result = nvme_enable_ctrl(dev, cap);
- if (result)
- goto free_nvmeq;
-
- nvmeq->cq_vector = 0;
- result = queue_request_irq(dev, nvmeq, nvmeq->irqname);
- if (result) {
- nvmeq->cq_vector = -1;
- goto free_nvmeq;
- }
-
- return result;
-
- free_nvmeq:
- nvme_free_queues(dev, 0);
- return result;
-}
-
-static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
-{
- struct nvme_dev *dev = ns->dev;
- struct nvme_user_io io;
- struct nvme_command c;
- unsigned length, meta_len;
- int status, write;
- dma_addr_t meta_dma = 0;
- void *meta = NULL;
- void __user *metadata;
-
- if (copy_from_user(&io, uio, sizeof(io)))
- return -EFAULT;
-
- switch (io.opcode) {
- case nvme_cmd_write:
- case nvme_cmd_read:
- case nvme_cmd_compare:
- break;
- default:
- return -EINVAL;
- }
-
- length = (io.nblocks + 1) << ns->lba_shift;
- meta_len = (io.nblocks + 1) * ns->ms;
- metadata = (void __user *)(unsigned long)io.metadata;
- write = io.opcode & 1;
-
- if (ns->ext) {
- length += meta_len;
- meta_len = 0;
- }
- if (meta_len) {
- if (((io.metadata & 3) || !io.metadata) && !ns->ext)
- return -EINVAL;
-
- meta = dma_alloc_coherent(dev->dev, meta_len,
- &meta_dma,
GFP_KERNEL);
-
- if (!meta) {
- status = -ENOMEM;
- goto unmap;
- }
- if (write) {
- if (copy_from_user(meta, metadata, meta_len))
{
- status = -EFAULT;
- goto unmap;
- }
- }
- }
-
- memset(&c, 0, sizeof(c));
- c.rw.opcode = io.opcode;
- c.rw.flags = io.flags;
- c.rw.nsid = cpu_to_le32(ns->ns_id);
- c.rw.slba = cpu_to_le64(io.slba);
- c.rw.length = cpu_to_le16(io.nblocks);
- c.rw.control = cpu_to_le16(io.control);
- c.rw.dsmgmt = cpu_to_le32(io.dsmgmt);
- c.rw.reftag = cpu_to_le32(io.reftag);
- c.rw.apptag = cpu_to_le16(io.apptag);
- c.rw.appmask = cpu_to_le16(io.appmask);
- c.rw.metadata = cpu_to_le64(meta_dma);
-
- status = __nvme_submit_sync_cmd(ns->queue, &c, NULL,
- (void __user *)io.addr, length, NULL, 0);
- unmap:
- if (meta) {
- if (status == NVME_SC_SUCCESS && !write) {
- if (copy_to_user(metadata, meta, meta_len))
- status = -EFAULT;
- }
- dma_free_coherent(dev->dev, meta_len, meta, meta_dma);
- }
- return status;
-}
-
-static int nvme_user_cmd(struct nvme_dev *dev, struct nvme_ns *ns,
- struct nvme_passthru_cmd __user *ucmd)
-{
- struct nvme_passthru_cmd cmd;
- struct nvme_command c;
- unsigned timeout = 0;
- int status;
-
- if (!capable(CAP_SYS_ADMIN))
- return -EACCES;
- if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
- return -EFAULT;
-
- memset(&c, 0, sizeof(c));
- c.common.opcode = cmd.opcode;
- c.common.flags = cmd.flags;
- c.common.nsid = cpu_to_le32(cmd.nsid);
- c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
- c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
- c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
- c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
- c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
- c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
- c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
- c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
-
- if (cmd.timeout_ms)
- timeout = msecs_to_jiffies(cmd.timeout_ms);
-
- status = __nvme_submit_sync_cmd(ns ? ns->queue : dev->admin_q,
&c,
- NULL, (void __user *)cmd.addr, cmd.data_len,
- &cmd.result, timeout);
- if (status >= 0) {
- if (put_user(cmd.result, &ucmd->result))
- return -EFAULT;
- }
-
- return status;
-}
-
-static int nvme_subsys_reset(struct nvme_dev *dev)
-{
- if (!dev->subsystem)
- return -ENOTTY;
-
- writel(0x4E564D65, &dev->bar->nssr); /* "NVMe" */
- return 0;
-}
-
-static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
- unsigned long
arg)
-{
- struct nvme_ns *ns = bdev->bd_disk->private_data;
-
- switch (cmd) {
- case NVME_IOCTL_ID:
- force_successful_syscall_return();
- return ns->ns_id;
- case NVME_IOCTL_ADMIN_CMD:
- return nvme_user_cmd(ns->dev, NULL, (void __user
*)arg);
- case NVME_IOCTL_IO_CMD:
- return nvme_user_cmd(ns->dev, ns, (void __user *)arg);
- case NVME_IOCTL_SUBMIT_IO:
- return nvme_submit_io(ns, (void __user *)arg);
- case SG_GET_VERSION_NUM:
- return nvme_sg_get_version_num((void __user *)arg);
- case SG_IO:
- return nvme_sg_io(ns, (void __user *)arg);
- default:
- return -ENOTTY;
- }
-}
-
-#ifdef CONFIG_COMPAT
-static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode,
- unsigned int cmd, unsigned
long arg)
-{
- switch (cmd) {
- case SG_IO:
- return -ENOIOCTLCMD;
- }
- return nvme_ioctl(bdev, mode, cmd, arg);
-}
-#else
-#define nvme_compat_ioctl NULL
-#endif
-
-static int nvme_open(struct block_device *bdev, fmode_t mode) -{
- int ret = 0;
- struct nvme_ns *ns;
-
- spin_lock(&dev_list_lock);
- ns = bdev->bd_disk->private_data;
- if (!ns)
- ret = -ENXIO;
- else if (!kref_get_unless_zero(&ns->dev->kref))
- ret = -ENXIO;
- spin_unlock(&dev_list_lock);
-
- return ret;
-}
-
-static void nvme_free_dev(struct kref *kref);
-
-static void nvme_release(struct gendisk *disk, fmode_t mode) -{
- struct nvme_ns *ns = disk->private_data;
- struct nvme_dev *dev = ns->dev;
-
- kref_put(&dev->kref, nvme_free_dev);
-}
-
-static int nvme_getgeo(struct block_device *bd, struct hd_geometry *geo)
-{
- /* some standard values */
- geo->heads = 1 << 6;
- geo->sectors = 1 << 5;
- geo->cylinders = get_capacity(bd->bd_disk) >> 11;
- return 0;
-}
-
-static void nvme_config_discard(struct nvme_ns *ns)
-{
- u32 logical_block_size = queue_logical_block_size(ns->queue);
- ns->queue->limits.discard_zeroes_data = 0;
- ns->queue->limits.discard_alignment = logical_block_size;
- ns->queue->limits.discard_granularity = logical_block_size;
- blk_queue_max_discard_sectors(ns->queue, 0xffffffff);
- queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue);
-}
-
-static int nvme_revalidate_disk(struct gendisk *disk)
-{
- struct nvme_ns *ns = disk->private_data;
- struct nvme_dev *dev = ns->dev;
- struct nvme_id_ns *id;
- u8 lbaf, pi_type;
- u16 old_ms;
- unsigned short bs;
-
- if (nvme_identify_ns(dev, ns->ns_id, &id)) {
- dev_warn(dev->dev, "%s: Identify failure nvme%dn%d\n",
__func__,
- dev->instance, ns
->ns_id);
- return -ENODEV;
- }
- if (id->ncap == 0) {
- kfree(id);
- return -ENODEV;
- }
-
- old_ms = ns->ms;
- lbaf = id->flbas & NVME_NS_FLBAS_LBA_MASK;
- ns->lba_shift = id->lbaf[lbaf].ds;
- ns->ms = le16_to_cpu(id->lbaf[lbaf].ms);
- ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT);
-
- /*
- * If identify namespace failed, use default 512 byte block
size so
- * block layer can use before failing read/write for 0
capacity.
- */
- if (ns->lba_shift == 0)
- ns->lba_shift = 9;
- bs = 1 << ns->lba_shift;
-
- /* XXX: PI implementation requires metadata equal t10 pi tuple
size */
- pi_type = ns->ms == sizeof(struct t10_pi_tuple) ?
- id->dps & NVME_NS_DPS_PI_MASK
: 0;
-
- if (blk_get_integrity(disk) && (ns->pi_type != pi_type ||
- ns->ms != old_ms ||
- bs != queue_logical_block_size(disk
->queue) ||
- (ns->ms && ns->ext)))
- blk_integrity_unregister(disk);
-
- ns->pi_type = pi_type;
- blk_queue_logical_block_size(ns->queue, bs);
-
- if (ns->ms && !blk_get_integrity(disk) && (disk->flags &
GENHD_FL_UP) &&
- !ns
->ext)
- nvme_init_integrity(ns);
-
- if (ns->ms && !(ns->ms == 8 && ns->pi_type) &&
!blk_get_integrity(disk))
- set_capacity(disk, 0);
- else
- set_capacity(disk, le64_to_cpup(&id->nsze) << (ns
->lba_shift - 9));
-
- if (dev->oncs & NVME_CTRL_ONCS_DSM)
- nvme_config_discard(ns);
-
- kfree(id);
- return 0;
-}
-
-static const struct block_device_operations nvme_fops = {
- .owner = THIS_MODULE,
- .ioctl = nvme_ioctl,
- .compat_ioctl = nvme_compat_ioctl,
- .open = nvme_open,
- .release = nvme_release,
- .getgeo = nvme_getgeo,
- .revalidate_disk= nvme_revalidate_disk,
-};
-
-static int nvme_kthread(void *data)
-{
- struct nvme_dev *dev, *next;
-
- while (!kthread_should_stop()) {
- set_current_state(TASK_INTERRUPTIBLE);
- spin_lock(&dev_list_lock);
- list_for_each_entry_safe(dev, next, &dev_list, node) {
- int i;
- u32 csts = readl(&dev->bar->csts);
-
- if ((dev->subsystem && (csts &
NVME_CSTS_NSSRO)) ||
- csts &
NVME_CSTS_CFS) {
- if (work_busy(&dev->reset_work))
- continue;
- list_del_init(&dev->node);
- dev_warn(dev->dev,
- "Failed status: %x, reset
controller\n",
- readl(&dev->bar->csts));
- dev->reset_workfn =
nvme_reset_failed_dev;
- queue_work(nvme_workq, &dev
->reset_work);
- continue;
- }
- for (i = 0; i < dev->queue_count; i++) {
- struct nvme_queue *nvmeq = dev
->queues[i];
- if (!nvmeq)
- continue;
- spin_lock_irq(&nvmeq->q_lock);
- nvme_process_cq(nvmeq);
-
- while ((i == 0) && (dev->event_limit >
0)) {
- if
(nvme_submit_async_admin_req(dev))
- break;
- dev->event_limit--;
- }
- spin_unlock_irq(&nvmeq->q_lock);
- }
- }
- spin_unlock(&dev_list_lock);
- schedule_timeout(round_jiffies_relative(HZ));
- }
- return 0;
-}
-
-static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid) -{
- struct nvme_ns *ns;
- struct gendisk *disk;
- int node = dev_to_node(dev->dev);
-
- ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
- if (!ns)
- return;
-
- ns->queue = blk_mq_init_queue(&dev->tagset);
- if (IS_ERR(ns->queue))
- goto out_free_ns;
- queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, ns->queue);
- queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue);
- ns->dev = dev;
- ns->queue->queuedata = ns;
-
- disk = alloc_disk_node(0, node);
- if (!disk)
- goto out_free_queue;
-
- ns->ns_id = nsid;
- ns->disk = disk;
- ns->lba_shift = 9; /* set to a default value for 512 until
disk is validated */
- list_add_tail(&ns->list, &dev->namespaces);
-
- blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
- if (dev->max_hw_sectors) {
- blk_queue_max_hw_sectors(ns->queue, dev
->max_hw_sectors);
- blk_queue_max_segments(ns->queue,
- ((dev->max_hw_sectors << 9) / dev->page_size)
+ 1);
- }
- if (dev->stripe_size)
- blk_queue_chunk_sectors(ns->queue, dev->stripe_size >>
9);
- if (dev->vwc & NVME_CTRL_VWC_PRESENT)
- blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
- blk_queue_virt_boundary(ns->queue, dev->page_size - 1);
-
- disk->major = nvme_major;
- disk->first_minor = 0;
- disk->fops = &nvme_fops;
- disk->private_data = ns;
- disk->queue = ns->queue;
- disk->driverfs_dev = dev->device;
- disk->flags = GENHD_FL_EXT_DEVT;
- sprintf(disk->disk_name, "nvme%dn%d", dev->instance, nsid);
-
- /*
- * Initialize capacity to 0 until we establish the namespace
format and
- * setup integrity extentions if necessary. The
revalidate_disk after
- * add_disk allows the driver to register with integrity if
the format
- * requires it.
- */
- set_capacity(disk, 0);
- if (nvme_revalidate_disk(ns->disk))
- goto out_free_disk;
-
- add_disk(ns->disk);
- if (ns->ms) {
- struct block_device *bd = bdget_disk(ns->disk, 0);
- if (!bd)
- return;
- if (blkdev_get(bd, FMODE_READ, NULL)) {
- bdput(bd);
- return;
- }
- blkdev_reread_part(bd);
- blkdev_put(bd, FMODE_READ);
- }
- return;
- out_free_disk:
- kfree(disk);
- list_del(&ns->list);
- out_free_queue:
- blk_cleanup_queue(ns->queue);
- out_free_ns:
- kfree(ns);
-}
-
-static void nvme_create_io_queues(struct nvme_dev *dev)
-{
- unsigned i;
-
- for (i = dev->queue_count; i <= dev->max_qid; i++)
- if (!nvme_alloc_queue(dev, i, dev->q_depth))
- break;
-
- for (i = dev->online_queues; i <= dev->queue_count - 1; i++)
- if (nvme_create_queue(dev->queues[i], i))
- break;
-}
-
-static int set_queue_count(struct nvme_dev *dev, int count) -{
- int status;
- u32 result;
- u32 q_count = (count - 1) | ((count - 1) << 16);
-
- status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count,
0,
- &resul
t);
- if (status < 0)
- return status;
- if (status > 0) {
- dev_err(dev->dev, "Could not set queue count (%d)\n",
status);
- return 0;
- }
- return min(result & 0xffff, result >> 16) + 1;
-}
-
-static void __iomem *nvme_map_cmb(struct nvme_dev *dev)
-{
- u64 szu, size, offset;
- u32 cmbloc;
- resource_size_t bar_size;
- struct pci_dev *pdev = to_pci_dev(dev->dev);
- void __iomem *cmb;
- dma_addr_t dma_addr;
-
- if (!use_cmb_sqes)
- return NULL;
-
- dev->cmbsz = readl(&dev->bar->cmbsz);
- if (!(NVME_CMB_SZ(dev->cmbsz)))
- return NULL;
-
- cmbloc = readl(&dev->bar->cmbloc);
-
- szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz));
- size = szu * NVME_CMB_SZ(dev->cmbsz);
- offset = szu * NVME_CMB_OFST(cmbloc);
- bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc));
-
- if (offset > bar_size)
- return NULL;
-
- /*
- * Controllers may support a CMB size larger than their BAR,
- * for example, due to being behind a bridge. Reduce the CMB
to
- * the reported size of the BAR
- */
- if (size > bar_size - offset)
- size = bar_size - offset;
-
- dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) +
offset;
- cmb = ioremap_wc(dma_addr, size);
- if (!cmb)
- return NULL;
-
- dev->cmb_dma_addr = dma_addr;
- dev->cmb_size = size;
- return cmb;
-}
-
-static inline void nvme_release_cmb(struct nvme_dev *dev) -{
- if (dev->cmb) {
- iounmap(dev->cmb);
- dev->cmb = NULL;
- }
-}
-
-static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) -{
- return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride);
-}
-
-static int nvme_setup_io_queues(struct nvme_dev *dev)
-{
- struct nvme_queue *adminq = dev->queues[0];
- struct pci_dev *pdev = to_pci_dev(dev->dev);
- int result, i, vecs, nr_io_queues, size;
-
- nr_io_queues = num_possible_cpus();
- result = set_queue_count(dev, nr_io_queues);
- if (result <= 0)
- return result;
- if (result < nr_io_queues)
- nr_io_queues = result;
-
- if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) {
- result = nvme_cmb_qdepth(dev, nr_io_queues,
- sizeof(struct nvme_command));
- if (result > 0)
- dev->q_depth = result;
- else
- nvme_release_cmb(dev);
- }
-
- size = db_bar_size(dev, nr_io_queues);
- if (size > 8192) {
- iounmap(dev->bar);
- do {
- dev->bar = ioremap(pci_resource_start(pdev,
0), size);
- if (dev->bar)
- break;
- if (!--nr_io_queues)
- return -ENOMEM;
- size = db_bar_size(dev, nr_io_queues);
- } while (1);
- dev->dbs = ((void __iomem *)dev->bar) + 4096;
- adminq->q_db = dev->dbs;
- }
-
- /* Deregister the admin queue's interrupt */
- free_irq(dev->entry[0].vector, adminq);
-
- /*
- * If we enable msix early due to not intx, disable it again
before
- * setting up the full range we need.
- */
- if (!pdev->irq)
- pci_disable_msix(pdev);
-
- for (i = 0; i < nr_io_queues; i++)
- dev->entry[i].entry = i;
- vecs = pci_enable_msix_range(pdev, dev->entry, 1,
nr_io_queues);
- if (vecs < 0) {
- vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues,
32));
- if (vecs < 0) {
- vecs = 1;
- } else {
- for (i = 0; i < vecs; i++)
- dev->entry[i].vector = i + pdev->irq;
- }
- }
-
- /*
- * Should investigate if there's a performance win from
allocating
- * more queues than interrupt vectors; it might allow the
submission
- * path to scale better, even if the receive path is limited
by the
- * number of interrupts.
- */
- nr_io_queues = vecs;
- dev->max_qid = nr_io_queues;
-
- result = queue_request_irq(dev, adminq, adminq->irqname);
- if (result) {
- adminq->cq_vector = -1;
- goto free_queues;
- }
-
- /* Free previously allocated queues that are no longer usable
*/
- nvme_free_queues(dev, nr_io_queues + 1);
- nvme_create_io_queues(dev);
-
- return 0;
-
- free_queues:
- nvme_free_queues(dev, 1);
- return result;
-}
-
-static void nvme_free_namespace(struct nvme_ns *ns)
-{
- list_del(&ns->list);
-
- spin_lock(&dev_list_lock);
- ns->disk->private_data = NULL;
- spin_unlock(&dev_list_lock);
-
- put_disk(ns->disk);
- kfree(ns);
-}
-
-static int ns_cmp(void *priv, struct list_head *a, struct list_head *b)
-{
- struct nvme_ns *nsa = container_of(a, struct nvme_ns, list);
- struct nvme_ns *nsb = container_of(b, struct nvme_ns, list);
-
- return nsa->ns_id - nsb->ns_id;
-}
-
-static struct nvme_ns *nvme_find_ns(struct nvme_dev *dev, unsigned nsid)
-{
- struct nvme_ns *ns;
-
- list_for_each_entry(ns, &dev->namespaces, list) {
- if (ns->ns_id == nsid)
- return ns;
- if (ns->ns_id > nsid)
- break;
- }
- return NULL;
-}
-
-static inline bool nvme_io_incapable(struct nvme_dev *dev) -{
- return (!dev->bar || readl(&dev->bar->csts) & NVME_CSTS_CFS ||
- dev
->online_queues < 2);
-}
-
-static void nvme_ns_remove(struct nvme_ns *ns)
-{
- bool kill = nvme_io_incapable(ns->dev) && !blk_queue_dying(ns
->queue);
-
- if (kill)
- blk_set_queue_dying(ns->queue);
- if (ns->disk->flags & GENHD_FL_UP) {
- if (blk_get_integrity(ns->disk))
- blk_integrity_unregister(ns->disk);
- del_gendisk(ns->disk);
- }
- if (kill || !blk_queue_dying(ns->queue)) {
- blk_mq_abort_requeue_list(ns->queue);
- blk_cleanup_queue(ns->queue);
- }
-}
-
-static void nvme_scan_namespaces(struct nvme_dev *dev, unsigned nn) -{
- struct nvme_ns *ns, *next;
- unsigned i;
-
- for (i = 1; i <= nn; i++) {
- ns = nvme_find_ns(dev, i);
- if (ns) {
- if (revalidate_disk(ns->disk)) {
- nvme_ns_remove(ns);
- nvme_free_namespace(ns);
- }
- } else
- nvme_alloc_ns(dev, i);
- }
- list_for_each_entry_safe(ns, next, &dev->namespaces, list) {
- if (ns->ns_id > nn) {
- nvme_ns_remove(ns);
- nvme_free_namespace(ns);
- }
- }
- list_sort(NULL, &dev->namespaces, ns_cmp);
-}
-
-static void nvme_dev_scan(struct work_struct *work)
-{
- struct nvme_dev *dev = container_of(work, struct nvme_dev,
scan_work);
- struct nvme_id_ctrl *ctrl;
-
- if (!dev->tagset.tags)
- return;
- if (nvme_identify_ctrl(dev, &ctrl))
- return;
- nvme_scan_namespaces(dev, le32_to_cpup(&ctrl->nn));
- kfree(ctrl);
-}
-
-/*
- * Return: error value if an error occurred setting up the queues or calling
- * Identify Device. 0 if these succeeded, even if adding some of the
- * namespaces failed. At the moment, these failures are silent. TBD which
- * failures should be reported.
- */
-static int nvme_dev_add(struct nvme_dev *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev->dev);
- int res;
- struct nvme_id_ctrl *ctrl;
- int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12;
-
- res = nvme_identify_ctrl(dev, &ctrl);
- if (res) {
- dev_err(dev->dev, "Identify Controller failed (%d)\n",
res);
- return -EIO;
- }
-
- dev->oncs = le16_to_cpup(&ctrl->oncs);
- dev->abort_limit = ctrl->acl + 1;
- dev->vwc = ctrl->vwc;
- memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
- memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
- memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
- if (ctrl->mdts)
- dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);
- if ((pdev->vendor == PCI_VENDOR_ID_INTEL) &&
- (pdev->device == 0x0953) && ctrl->vs[3]) {
- unsigned int max_hw_sectors;
-
- dev->stripe_size = 1 << (ctrl->vs[3] + shift);
- max_hw_sectors = dev->stripe_size >> (shift - 9);
- if (dev->max_hw_sectors) {
- dev->max_hw_sectors = min(max_hw_sectors,
- dev
->max_hw_sectors);
- } else
- dev->max_hw_sectors = max_hw_sectors;
- }
- kfree(ctrl);
-
- if (!dev->tagset.tags) {
- dev->tagset.ops = &nvme_mq_ops;
- dev->tagset.nr_hw_queues = dev->online_queues - 1;
- dev->tagset.timeout = NVME_IO_TIMEOUT;
- dev->tagset.numa_node = dev_to_node(dev->dev);
- dev->tagset.queue_depth =
- min_t(int, dev->q_depth,
BLK_MQ_MAX_DEPTH) - 1;
- dev->tagset.cmd_size = nvme_cmd_size(dev);
- dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE;
- dev->tagset.driver_data = dev;
-
- if (blk_mq_alloc_tag_set(&dev->tagset))
- return 0;
- }
- schedule_work(&dev->scan_work);
- return 0;
-}
-
-static int nvme_dev_map(struct nvme_dev *dev)
-{
- u64 cap;
- int bars, result = -ENOMEM;
- struct pci_dev *pdev = to_pci_dev(dev->dev);
-
- if (pci_enable_device_mem(pdev))
- return result;
-
- dev->entry[0].vector = pdev->irq;
- pci_set_master(pdev);
- bars = pci_select_bars(pdev, IORESOURCE_MEM);
- if (!bars)
- goto disable_pci;
-
- if (pci_request_selected_regions(pdev, bars, "nvme"))
- goto disable_pci;
-
- if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
- dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(32)))
- goto disable;
-
- dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
- if (!dev->bar)
- goto disable;
-
- if (readl(&dev->bar->csts) == -1) {
- result = -ENODEV;
- goto unmap;
- }
-
- /*
- * Some devices don't advertse INTx interrupts, pre-enable a
single
- * MSIX vec for setup. We'll adjust this later.
- */
- if (!pdev->irq) {
- result = pci_enable_msix(pdev, dev->entry, 1);
- if (result < 0)
- goto unmap;
- }
-
- cap = readq(&dev->bar->cap);
- dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1,
NVME_Q_DEPTH);
- dev->db_stride = 1 << NVME_CAP_STRIDE(cap);
- dev->dbs = ((void __iomem *)dev->bar) + 4096;
- if (readl(&dev->bar->vs) >= NVME_VS(1, 2))
- dev->cmb = nvme_map_cmb(dev);
-
- return 0;
-
- unmap:
- iounmap(dev->bar);
- dev->bar = NULL;
- disable:
- pci_release_regions(pdev);
- disable_pci:
- pci_disable_device(pdev);
- return result;
-}
-
-static void nvme_dev_unmap(struct nvme_dev *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev->dev);
-
- if (pdev->msi_enabled)
- pci_disable_msi(pdev);
- else if (pdev->msix_enabled)
- pci_disable_msix(pdev);
-
- if (dev->bar) {
- iounmap(dev->bar);
- dev->bar = NULL;
- pci_release_regions(pdev);
- }
-
- if (pci_is_enabled(pdev))
- pci_disable_device(pdev);
-}
-
-struct nvme_delq_ctx {
- struct task_struct *waiter;
- struct kthread_worker *worker;
- atomic_t refcount;
-};
-
-static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev)
-{
- dq->waiter = current;
- mb();
-
- for (;;) {
- set_current_state(TASK_KILLABLE);
- if (!atomic_read(&dq->refcount))
- break;
- if (!schedule_timeout(ADMIN_TIMEOUT) ||
- fatal_signal_pending(current))
{
- /*
- * Disable the controller first since we can't
trust it
- * at this point, but leave the admin queue
enabled
- * until all queue deletion requests are
flushed.
- * FIXME: This may take a while if there are
more h/w
- * queues than admin tags.
- */
- set_current_state(TASK_RUNNING);
- nvme_disable_ctrl(dev, readq(&dev->bar->cap));
- nvme_clear_queue(dev->queues[0]);
- flush_kthread_worker(dq->worker);
- nvme_disable_queue(dev, 0);
- return;
- }
- }
- set_current_state(TASK_RUNNING);
-}
-
-static void nvme_put_dq(struct nvme_delq_ctx *dq)
-{
- atomic_dec(&dq->refcount);
- if (dq->waiter)
- wake_up_process(dq->waiter);
-}
-
-static struct nvme_delq_ctx *nvme_get_dq(struct nvme_delq_ctx *dq) -{
- atomic_inc(&dq->refcount);
- return dq;
-}
-
-static void nvme_del_queue_end(struct nvme_queue *nvmeq)
-{
- struct nvme_delq_ctx *dq = nvmeq->cmdinfo.ctx;
- nvme_put_dq(dq);
-}
-
-static int adapter_async_del_queue(struct nvme_queue *nvmeq, u8 opcode,
- kthread_work_func_t
fn)
-{
- struct nvme_command c;
-
- memset(&c, 0, sizeof(c));
- c.delete_queue.opcode = opcode;
- c.delete_queue.qid = cpu_to_le16(nvmeq->qid);
-
- init_kthread_work(&nvmeq->cmdinfo.work, fn);
- return nvme_submit_admin_async_cmd(nvmeq->dev, &c, &nvmeq
->cmdinfo,
- ADMIN_
TIMEOUT);
-}
-
-static void nvme_del_cq_work_handler(struct kthread_work *work) -{
- struct nvme_queue *nvmeq = container_of(work, struct
nvme_queue,
- cmdinfo.work);
- nvme_del_queue_end(nvmeq);
-}
-
-static int nvme_delete_cq(struct nvme_queue *nvmeq)
-{
- return adapter_async_del_queue(nvmeq, nvme_admin_delete_cq,
- nvme_del_cq_work_handl
er);
-}
-
-static void nvme_del_sq_work_handler(struct kthread_work *work) -{
- struct nvme_queue *nvmeq = container_of(work, struct
nvme_queue,
- cmdinfo.work);
- int status = nvmeq->cmdinfo.status;
-
- if (!status)
- status = nvme_delete_cq(nvmeq);
- if (status)
- nvme_del_queue_end(nvmeq);
-}
-
-static int nvme_delete_sq(struct nvme_queue *nvmeq)
-{
- return adapter_async_del_queue(nvmeq, nvme_admin_delete_sq,
- nvme_del_sq_work_handl
er);
-}
-
-static void nvme_del_queue_start(struct kthread_work *work) -{
- struct nvme_queue *nvmeq = container_of(work, struct
nvme_queue,
- cmdinfo.work);
- if (nvme_delete_sq(nvmeq))
- nvme_del_queue_end(nvmeq);
-}
-
-static void nvme_disable_io_queues(struct nvme_dev *dev)
-{
- int i;
- DEFINE_KTHREAD_WORKER_ONSTACK(worker);
- struct nvme_delq_ctx dq;
- struct task_struct *kworker_task =
kthread_run(kthread_worker_fn,
- &worker, "nvme%d", dev
->instance);
-
- if (IS_ERR(kworker_task)) {
- dev_err(dev->dev,
- "Failed to create queue del task\n");
- for (i = dev->queue_count - 1; i > 0; i--)
- nvme_disable_queue(dev, i);
- return;
- }
-
- dq.waiter = NULL;
- atomic_set(&dq.refcount, 0);
- dq.worker = &worker;
- for (i = dev->queue_count - 1; i > 0; i--) {
- struct nvme_queue *nvmeq = dev->queues[i];
-
- if (nvme_suspend_queue(nvmeq))
- continue;
- nvmeq->cmdinfo.ctx = nvme_get_dq(&dq);
- nvmeq->cmdinfo.worker = dq.worker;
- init_kthread_work(&nvmeq->cmdinfo.work,
nvme_del_queue_start);
- queue_kthread_work(dq.worker, &nvmeq->cmdinfo.work);
- }
- nvme_wait_dq(&dq, dev);
- kthread_stop(kworker_task);
-}
-
-/*
-* Remove the node from the device list and check
-* for whether or not we need to stop the nvme_thread.
-*/
-static void nvme_dev_list_remove(struct nvme_dev *dev)
-{
- struct task_struct *tmp = NULL;
-
- spin_lock(&dev_list_lock);
- list_del_init(&dev->node);
- if (list_empty(&dev_list) && !IS_ERR_OR_NULL(nvme_thread)) {
- tmp = nvme_thread;
- nvme_thread = NULL;
- }
- spin_unlock(&dev_list_lock);
-
- if (tmp)
- kthread_stop(tmp);
-}
-
-static void nvme_freeze_queues(struct nvme_dev *dev)
-{
- struct nvme_ns *ns;
-
- list_for_each_entry(ns, &dev->namespaces, list) {
- blk_mq_freeze_queue_start(ns->queue);
-
- spin_lock_irq(ns->queue->queue_lock);
- queue_flag_set(QUEUE_FLAG_STOPPED, ns->queue);
- spin_unlock_irq(ns->queue->queue_lock);
-
- blk_mq_cancel_requeue_work(ns->queue);
- blk_mq_stop_hw_queues(ns->queue);
- }
-}
-
-static void nvme_unfreeze_queues(struct nvme_dev *dev)
-{
- struct nvme_ns *ns;
-
- list_for_each_entry(ns, &dev->namespaces, list) {
- queue_flag_clear_unlocked(QUEUE_FLAG_STOPPED, ns
->queue);
- blk_mq_unfreeze_queue(ns->queue);
- blk_mq_start_stopped_hw_queues(ns->queue, true);
- blk_mq_kick_requeue_list(ns->queue);
- }
-}
-
-static void nvme_dev_shutdown(struct nvme_dev *dev)
-{
- int i;
- u32 csts = -1;
-
- nvme_dev_list_remove(dev);
-
- if (dev->bar) {
- nvme_freeze_queues(dev);
- csts = readl(&dev->bar->csts);
- }
- if (csts & NVME_CSTS_CFS || !(csts & NVME_CSTS_RDY)) {
- for (i = dev->queue_count - 1; i >= 0; i--) {
- struct nvme_queue *nvmeq = dev->queues[i];
- nvme_suspend_queue(nvmeq);
- }
- } else {
- nvme_disable_io_queues(dev);
- nvme_shutdown_ctrl(dev);
- nvme_disable_queue(dev, 0);
- }
- nvme_dev_unmap(dev);
-
- for (i = dev->queue_count - 1; i >= 0; i--)
- nvme_clear_queue(dev->queues[i]);
-}
-
-static void nvme_dev_remove(struct nvme_dev *dev)
-{
- struct nvme_ns *ns;
-
- list_for_each_entry(ns, &dev->namespaces, list)
- nvme_ns_remove(ns);
-}
-
-static int nvme_setup_prp_pools(struct nvme_dev *dev)
-{
- dev->prp_page_pool = dma_pool_create("prp list page", dev
->dev,
- PAGE_SIZE, PAGE_SIZE,
0);
- if (!dev->prp_page_pool)
- return -ENOMEM;
-
- /* Optimisation for I/Os between 4k and 128k */
- dev->prp_small_pool = dma_pool_create("prp list 256", dev
->dev,
- 256, 256, 0);
- if (!dev->prp_small_pool) {
- dma_pool_destroy(dev->prp_page_pool);
- return -ENOMEM;
- }
- return 0;
-}
-
-static void nvme_release_prp_pools(struct nvme_dev *dev)
-{
- dma_pool_destroy(dev->prp_page_pool);
- dma_pool_destroy(dev->prp_small_pool);
-}
-
-static DEFINE_IDA(nvme_instance_ida);
-
-static int nvme_set_instance(struct nvme_dev *dev)
-{
- int instance, error;
-
- do {
- if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL))
- return -ENODEV;
-
- spin_lock(&dev_list_lock);
- error = ida_get_new(&nvme_instance_ida, &instance);
- spin_unlock(&dev_list_lock);
- } while (error == -EAGAIN);
-
- if (error)
- return -ENODEV;
-
- dev->instance = instance;
- return 0;
-}
-
-static void nvme_release_instance(struct nvme_dev *dev)
-{
- spin_lock(&dev_list_lock);
- ida_remove(&nvme_instance_ida, dev->instance);
- spin_unlock(&dev_list_lock);
-}
-
-static void nvme_free_namespaces(struct nvme_dev *dev)
-{
- struct nvme_ns *ns, *next;
-
- list_for_each_entry_safe(ns, next, &dev->namespaces, list)
- nvme_free_namespace(ns);
-}
-
-static void nvme_free_dev(struct kref *kref)
-{
- struct nvme_dev *dev = container_of(kref, struct nvme_dev,
kref);
-
- put_device(dev->dev);
- put_device(dev->device);
- nvme_free_namespaces(dev);
- nvme_release_instance(dev);
- if (dev->tagset.tags)
- blk_mq_free_tag_set(&dev->tagset);
- if (dev->admin_q)
- blk_put_queue(dev->admin_q);
- kfree(dev->queues);
- kfree(dev->entry);
- kfree(dev);
-}
-
-static int nvme_dev_open(struct inode *inode, struct file *f) -{
- struct nvme_dev *dev;
- int instance = iminor(inode);
- int ret = -ENODEV;
-
- spin_lock(&dev_list_lock);
- list_for_each_entry(dev, &dev_list, node) {
- if (dev->instance == instance) {
- if (!dev->admin_q) {
- ret = -EWOULDBLOCK;
- break;
- }
- if (!kref_get_unless_zero(&dev->kref))
- break;
- f->private_data = dev;
- ret = 0;
- break;
- }
- }
- spin_unlock(&dev_list_lock);
-
- return ret;
-}
-
-static int nvme_dev_release(struct inode *inode, struct file *f) -{
- struct nvme_dev *dev = f->private_data;
- kref_put(&dev->kref, nvme_free_dev);
- return 0;
-}
-
-static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
-{
- struct nvme_dev *dev = f->private_data;
- struct nvme_ns *ns;
-
- switch (cmd) {
- case NVME_IOCTL_ADMIN_CMD:
- return nvme_user_cmd(dev, NULL, (void __user *)arg);
- case NVME_IOCTL_IO_CMD:
- if (list_empty(&dev->namespaces))
- return -ENOTTY;
- ns = list_first_entry(&dev->namespaces, struct
nvme_ns, list);
- return nvme_user_cmd(dev, ns, (void __user *)arg);
- case NVME_IOCTL_RESET:
- dev_warn(dev->dev, "resetting controller\n");
- return nvme_reset(dev);
- case NVME_IOCTL_SUBSYS_RESET:
- return nvme_subsys_reset(dev);
- default:
- return -ENOTTY;
- }
-}
-
-static const struct file_operations nvme_dev_fops = {
- .owner = THIS_MODULE,
- .open = nvme_dev_open,
- .release = nvme_dev_release,
- .unlocked_ioctl = nvme_dev_ioctl,
- .compat_ioctl = nvme_dev_ioctl,
-};
-
-static void nvme_set_irq_hints(struct nvme_dev *dev)
-{
- struct nvme_queue *nvmeq;
- int i;
-
- for (i = 0; i < dev->online_queues; i++) {
- nvmeq = dev->queues[i];
-
- if (!nvmeq->tags || !(*nvmeq->tags))
- continue;
-
- irq_set_affinity_hint(dev->entry[nvmeq
->cq_vector].vector,
- blk_mq_tags_cpumask(*nvmeq
->tags));
- }
-}
-
-static int nvme_dev_start(struct nvme_dev *dev)
-{
- int result;
- bool start_thread = false;
-
- result = nvme_dev_map(dev);
- if (result)
- return result;
-
- result = nvme_configure_admin_queue(dev);
- if (result)
- goto unmap;
-
- spin_lock(&dev_list_lock);
- if (list_empty(&dev_list) && IS_ERR_OR_NULL(nvme_thread)) {
- start_thread = true;
- nvme_thread = NULL;
- }
- list_add(&dev->node, &dev_list);
- spin_unlock(&dev_list_lock);
-
- if (start_thread) {
- nvme_thread = kthread_run(nvme_kthread, NULL, "nvme");
- wake_up_all(&nvme_kthread_wait);
- } else
- wait_event_killable(nvme_kthread_wait, nvme_thread);
-
- if (IS_ERR_OR_NULL(nvme_thread)) {
- result = nvme_thread ? PTR_ERR(nvme_thread) : -EINTR;
- goto disable;
- }
-
- nvme_init_queue(dev->queues[0], 0);
- result = nvme_alloc_admin_tags(dev);
- if (result)
- goto disable;
-
- result = nvme_setup_io_queues(dev);
- if (result)
- goto free_tags;
-
- nvme_set_irq_hints(dev);
-
- dev->event_limit = 1;
- return result;
-
- free_tags:
- nvme_dev_remove_admin(dev);
- blk_put_queue(dev->admin_q);
- dev->admin_q = NULL;
- dev->queues[0]->tags = NULL;
- disable:
- nvme_disable_queue(dev, 0);
- nvme_dev_list_remove(dev);
- unmap:
- nvme_dev_unmap(dev);
- return result;
-}
-
-static int nvme_remove_dead_ctrl(void *arg)
-{
- struct nvme_dev *dev = (struct nvme_dev *)arg;
- struct pci_dev *pdev = to_pci_dev(dev->dev);
-
- if (pci_get_drvdata(pdev))
- pci_stop_and_remove_bus_device_locked(pdev);
- kref_put(&dev->kref, nvme_free_dev);
- return 0;
-}
-
-static void nvme_remove_disks(struct work_struct *ws)
-{
- struct nvme_dev *dev = container_of(ws, struct nvme_dev,
reset_work);
-
- nvme_free_queues(dev, 1);
- nvme_dev_remove(dev);
-}
-
-static int nvme_dev_resume(struct nvme_dev *dev)
-{
- int ret;
-
- ret = nvme_dev_start(dev);
- if (ret)
- return ret;
- if (dev->online_queues < 2) {
- spin_lock(&dev_list_lock);
- dev->reset_workfn = nvme_remove_disks;
- queue_work(nvme_workq, &dev->reset_work);
- spin_unlock(&dev_list_lock);
- } else {
- nvme_unfreeze_queues(dev);
- nvme_dev_add(dev);
- nvme_set_irq_hints(dev);
- }
- return 0;
-}
-
-static void nvme_dead_ctrl(struct nvme_dev *dev)
-{
- dev_warn(dev->dev, "Device failed to resume\n");
- kref_get(&dev->kref);
- if (IS_ERR(kthread_run(nvme_remove_dead_ctrl, dev, "nvme%d",
- dev->instance))) {
- dev_err(dev->dev,
- "Failed to start controller remove task\n");
- kref_put(&dev->kref, nvme_free_dev);
- }
-}
-
-static void nvme_dev_reset(struct nvme_dev *dev)
-{
- bool in_probe = work_busy(&dev->probe_work);
-
- nvme_dev_shutdown(dev);
-
- /* Synchronize with device probe so that work will see failure
status
- * and exit gracefully without trying to schedule another
reset */
- flush_work(&dev->probe_work);
-
- /* Fail this device if reset occured during probe to avoid
- * infinite initialization loops. */
- if (in_probe) {
- nvme_dead_ctrl(dev);
- return;
- }
- /* Schedule device resume asynchronously so the reset work is
available
- * to cleanup errors that may occur during reinitialization */
- schedule_work(&dev->probe_work);
-}
-
-static void nvme_reset_failed_dev(struct work_struct *ws) -{
- struct nvme_dev *dev = container_of(ws, struct nvme_dev,
reset_work);
- nvme_dev_reset(dev);
-}
-
-static void nvme_reset_workfn(struct work_struct *work)
-{
- struct nvme_dev *dev = container_of(work, struct nvme_dev,
reset_work);
- dev->reset_workfn(work);
-}
-
-static int nvme_reset(struct nvme_dev *dev)
-{
- int ret = -EBUSY;
-
- if (!dev->admin_q || blk_queue_dying(dev->admin_q))
- return -ENODEV;
-
- spin_lock(&dev_list_lock);
- if (!work_pending(&dev->reset_work)) {
- dev->reset_workfn = nvme_reset_failed_dev;
- queue_work(nvme_workq, &dev->reset_work);
- ret = 0;
- }
- spin_unlock(&dev_list_lock);
-
- if (!ret) {
- flush_work(&dev->reset_work);
- flush_work(&dev->probe_work);
- return 0;
- }
-
- return ret;
-}
-
-static ssize_t nvme_sysfs_reset(struct device *dev,
- struct device_attribute *attr, const
char *buf,
- size_t count)
-{
- struct nvme_dev *ndev = dev_get_drvdata(dev);
- int ret;
-
- ret = nvme_reset(ndev);
- if (ret < 0)
- return ret;
-
- return count;
-}
-static DEVICE_ATTR(reset_controller, S_IWUSR, NULL, nvme_sysfs_reset); -
-static void nvme_async_probe(struct work_struct *work); -static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-{
- int node, result = -ENOMEM;
- struct nvme_dev *dev;
-
- node = dev_to_node(&pdev->dev);
- if (node == NUMA_NO_NODE)
- set_dev_node(&pdev->dev, 0);
-
- dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node);
- if (!dev)
- return -ENOMEM;
- dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev
->entry),
- GFP_KERNEL,
node);
- if (!dev->entry)
- goto free;
- dev->queues = kzalloc_node((num_possible_cpus() + 1) *
sizeof(void *),
- GFP_KERNEL,
node);
- if (!dev->queues)
- goto free;
-
- INIT_LIST_HEAD(&dev->namespaces);
- dev->reset_workfn = nvme_reset_failed_dev;
- INIT_WORK(&dev->reset_work, nvme_reset_workfn);
- dev->dev = get_device(&pdev->dev);
- pci_set_drvdata(pdev, dev);
- result = nvme_set_instance(dev);
- if (result)
- goto put_pci;
-
- result = nvme_setup_prp_pools(dev);
- if (result)
- goto release;
-
- kref_init(&dev->kref);
- dev->device = device_create(nvme_class, &pdev->dev,
- MKDEV(nvme_char_major, dev->instance),
- dev, "nvme%d", dev->instance);
- if (IS_ERR(dev->device)) {
- result = PTR_ERR(dev->device);
- goto release_pools;
- }
- get_device(dev->device);
- dev_set_drvdata(dev->device, dev);
-
- result = device_create_file(dev->device,
&dev_attr_reset_controller);
- if (result)
- goto put_dev;
-
- INIT_LIST_HEAD(&dev->node);
- INIT_WORK(&dev->scan_work, nvme_dev_scan);
- INIT_WORK(&dev->probe_work, nvme_async_probe);
- schedule_work(&dev->probe_work);
- return 0;
-
- put_dev:
- device_destroy(nvme_class, MKDEV(nvme_char_major, dev
->instance));
- put_device(dev->device);
- release_pools:
- nvme_release_prp_pools(dev);
- release:
- nvme_release_instance(dev);
- put_pci:
- put_device(dev->dev);
- free:
- kfree(dev->queues);
- kfree(dev->entry);
- kfree(dev);
- return result;
-}
-
-static void nvme_async_probe(struct work_struct *work)
-{
- struct nvme_dev *dev = container_of(work, struct nvme_dev,
probe_work);
-
- if (nvme_dev_resume(dev) && !work_busy(&dev->reset_work))
- nvme_dead_ctrl(dev);
-}
-
-static void nvme_reset_notify(struct pci_dev *pdev, bool prepare) -{
- struct nvme_dev *dev = pci_get_drvdata(pdev);
-
- if (prepare)
- nvme_dev_shutdown(dev);
- else
- nvme_dev_resume(dev);
-}
-
-static void nvme_shutdown(struct pci_dev *pdev)
-{
- struct nvme_dev *dev = pci_get_drvdata(pdev);
- nvme_dev_shutdown(dev);
-}
-
-static void nvme_remove(struct pci_dev *pdev)
-{
- struct nvme_dev *dev = pci_get_drvdata(pdev);
-
- spin_lock(&dev_list_lock);
- list_del_init(&dev->node);
- spin_unlock(&dev_list_lock);
-
- pci_set_drvdata(pdev, NULL);
- flush_work(&dev->probe_work);
- flush_work(&dev->reset_work);
- flush_work(&dev->scan_work);
- device_remove_file(dev->device, &dev_attr_reset_controller);
- nvme_dev_remove(dev);
- nvme_dev_shutdown(dev);
- nvme_dev_remove_admin(dev);
- device_destroy(nvme_class, MKDEV(nvme_char_major, dev
->instance));
- nvme_free_queues(dev, 0);
- nvme_release_cmb(dev);
- nvme_release_prp_pools(dev);
- kref_put(&dev->kref, nvme_free_dev);
-}
-
-/* These functions are yet to be implemented */
-#define nvme_error_detected NULL
-#define nvme_dump_registers NULL
-#define nvme_link_reset NULL
-#define nvme_slot_reset NULL
-#define nvme_error_resume NULL
-
-#ifdef CONFIG_PM_SLEEP
-static int nvme_suspend(struct device *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct nvme_dev *ndev = pci_get_drvdata(pdev);
-
- nvme_dev_shutdown(ndev);
- return 0;
-}
-
-static int nvme_resume(struct device *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct nvme_dev *ndev = pci_get_drvdata(pdev);
-
- if (nvme_dev_resume(ndev) && !work_busy(&ndev->reset_work)) {
- ndev->reset_workfn = nvme_reset_failed_dev;
- queue_work(nvme_workq, &ndev->reset_work);
- }
- return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(nvme_dev_pm_ops, nvme_suspend, nvme_resume); -
-static const struct pci_error_handlers nvme_err_handler = {
- .error_detected = nvme_error_detected,
- .mmio_enabled = nvme_dump_registers,
- .link_reset = nvme_link_reset,
- .slot_reset = nvme_slot_reset,
- .resume = nvme_error_resume,
- .reset_notify = nvme_reset_notify,
-};
-
-/* Move to pci_ids.h later */
-#define PCI_CLASS_STORAGE_EXPRESS 0x010802
-
-static const struct pci_device_id nvme_id_table[] = {
- { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) },
- { 0, }
-};
-MODULE_DEVICE_TABLE(pci, nvme_id_table);
-
-static struct pci_driver nvme_driver = {
- .name = "nvme",
- .id_table = nvme_id_table,
- .probe = nvme_probe,
- .remove = nvme_remove,
- .shutdown = nvme_shutdown,
- .driver = {
- .pm = &nvme_dev_pm_ops,
- },
- .err_handler = &nvme_err_handler,
-};
-
-static int __init nvme_init(void)
-{
- int result;
-
- init_waitqueue_head(&nvme_kthread_wait);
-
- nvme_workq = create_singlethread_workqueue("nvme");
- if (!nvme_workq)
- return -ENOMEM;
-
- result = register_blkdev(nvme_major, "nvme");
- if (result < 0)
- goto kill_workq;
- else if (result > 0)
- nvme_major = result;
-
- result = __register_chrdev(nvme_char_major, 0, NVME_MINORS,
"nvme",
- &nvme_dev_fops
);
- if (result < 0)
- goto unregister_blkdev;
- else if (result > 0)
- nvme_char_major = result;
-
- nvme_class = class_create(THIS_MODULE, "nvme");
- if (IS_ERR(nvme_class)) {
- result = PTR_ERR(nvme_class);
- goto unregister_chrdev;
- }
-
- result = pci_register_driver(&nvme_driver);
- if (result)
- goto destroy_class;
- return 0;
-
- destroy_class:
- class_destroy(nvme_class);
- unregister_chrdev:
- __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
- unregister_blkdev:
- unregister_blkdev(nvme_major, "nvme");
- kill_workq:
- destroy_workqueue(nvme_workq);
- return result;
-}
-
-static void __exit nvme_exit(void)
-{
- pci_unregister_driver(&nvme_driver);
- unregister_blkdev(nvme_major, "nvme");
- destroy_workqueue(nvme_workq);
- class_destroy(nvme_class);
- __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme");
- BUG_ON(nvme_thread && !IS_ERR(nvme_thread));
- _nvme_check_size();
-}
-
-MODULE_AUTHOR("Matthew Wilcox <willy at linux.intel.com>"); -MODULE_LICENSE("GPL");
-MODULE_VERSION("1.0");
-module_init(nvme_init);
-module_exit(nvme_exit);

deleted file mode 100644
index e5a63f0..0000000
@@ -1,2556 +0,0 @@
-/*
- * NVM Express device driver
- * Copyright (c) 2011-2014, Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or

modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- */
-
-/*
- * Refer to the SCSI-NVMe Translation spec for details on how
- * each command is translated.
- */
-
-#include <linux/nvme.h>
-#include <linux/bio.h>
-#include <linux/bitops.h>
-#include <linux/blkdev.h>
-#include <linux/compat.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/genhd.h>
-#include <linux/idr.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kdev_t.h>
-#include <linux/kthread.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/pci.h>
-#include <linux/poison.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <asm/unaligned.h>
-#include <scsi/sg.h>
-#include <scsi/scsi.h>
-
-
-static int sg_version_num = 30534; /* 2 digits for each component
*/
-
-/* VPD Page Codes */
-#define VPD_SUPPORTED_PAGES 0x00
-#define VPD_SERIAL_NUMBER 0x80
-#define VPD_DEVICE_IDENTIFIERS 0x83
-#define VPD_EXTENDED_INQUIRY 0x86
-#define VPD_BLOCK_LIMITS 0xB0
-#define VPD_BLOCK_DEV_CHARACTERISTICS 0xB1
-
-/* format unit paramter list offsets */
-#define FORMAT_UNIT_SHORT_PARM_LIST_LEN 4
-#define FORMAT_UNIT_LONG_PARM_LIST_LEN 8
-#define FORMAT_UNIT_PROT_INT_OFFSET 3
-#define FORMAT_UNIT_PROT_FIELD_USAGE_OFFSET 0
-#define FORMAT_UNIT_PROT_FIELD_USAGE_MASK 0x07
-
-/* Misc. defines */
-#define FIXED_SENSE_DATA 0x70
-#define DESC_FORMAT_SENSE_DATA 0x72
-#define FIXED_SENSE_DATA_ADD_LENGTH 10
-#define LUN_ENTRY_SIZE 8
-#define LUN_DATA_HEADER_SIZE 8
-#define ALL_LUNS_RETURNED 0x02
-#define ALL_WELL_KNOWN_LUNS_RETURNED 0x01
-#define RESTRICTED_LUNS_RETURNED 0x00
-#define NVME_POWER_STATE_START_VALID 0x00
-#define NVME_POWER_STATE_ACTIVE 0x01
-#define NVME_POWER_STATE_IDLE 0x02
-#define NVME_POWER_STATE_STANDBY 0x03
-#define NVME_POWER_STATE_LU_CONTROL 0x07
-#define POWER_STATE_0 0
-#define POWER_STATE_1 1
-#define POWER_STATE_2 2
-#define POWER_STATE_3 3
-#define DOWNLOAD_SAVE_ACTIVATE 0x05
-#define DOWNLOAD_SAVE_DEFER_ACTIVATE 0x0E
-#define ACTIVATE_DEFERRED_MICROCODE 0x0F
-#define FORMAT_UNIT_IMMED_MASK 0x2
-#define FORMAT_UNIT_IMMED_OFFSET 1
-#define KELVIN_TEMP_FACTOR 273
-#define FIXED_FMT_SENSE_DATA_SIZE 18
-#define DESC_FMT_SENSE_DATA_SIZE 8
-
-/* SCSI/NVMe defines and bit masks */
-#define INQ_STANDARD_INQUIRY_PAGE 0x00
-#define INQ_SUPPORTED_VPD_PAGES_PAGE 0x00
-#define INQ_UNIT_SERIAL_NUMBER_PAGE 0x80
-#define INQ_DEVICE_IDENTIFICATION_PAGE 0x83
-#define INQ_EXTENDED_INQUIRY_DATA_PAGE 0x86
-#define INQ_BDEV_LIMITS_PAGE 0xB0
-#define INQ_BDEV_CHARACTERISTICS_PAGE 0xB1
-#define INQ_SERIAL_NUMBER_LENGTH 0x14
-#define INQ_NUM_SUPPORTED_VPD_PAGES 6
-#define VERSION_SPC_4 0x06
-#define ACA_UNSUPPORTED 0
-#define STANDARD_INQUIRY_LENGTH 36
-#define ADDITIONAL_STD_INQ_LENGTH 31
-#define EXTENDED_INQUIRY_DATA_PAGE_LENGTH 0x3C
-#define RESERVED_FIELD 0
-
-/* Mode Sense/Select defines */
-#define MODE_PAGE_INFO_EXCEP 0x1C
-#define MODE_PAGE_CACHING 0x08
-#define MODE_PAGE_CONTROL 0x0A
-#define MODE_PAGE_POWER_CONDITION 0x1A
-#define MODE_PAGE_RETURN_ALL 0x3F
-#define MODE_PAGE_BLK_DES_LEN 0x08
-#define MODE_PAGE_LLBAA_BLK_DES_LEN 0x10
-#define MODE_PAGE_CACHING_LEN 0x14
-#define MODE_PAGE_CONTROL_LEN 0x0C
-#define MODE_PAGE_POW_CND_LEN 0x28
-#define MODE_PAGE_INF_EXC_LEN 0x0C
-#define MODE_PAGE_ALL_LEN 0x54
-#define MODE_SENSE6_MPH_SIZE 4
-#define MODE_SENSE_PAGE_CONTROL_MASK 0xC0
-#define MODE_SENSE_PAGE_CODE_OFFSET 2
-#define MODE_SENSE_PAGE_CODE_MASK 0x3F
-#define MODE_SENSE_LLBAA_MASK 0x10
-#define MODE_SENSE_LLBAA_SHIFT 4
-#define MODE_SENSE_DBD_MASK 8
-#define MODE_SENSE_DBD_SHIFT 3
-#define MODE_SENSE10_MPH_SIZE 8
-#define MODE_SELECT_CDB_PAGE_FORMAT_MASK 0x10
-#define MODE_SELECT_CDB_SAVE_PAGES_MASK 0x1
-#define MODE_SELECT_6_BD_OFFSET 3
-#define MODE_SELECT_10_BD_OFFSET 6
-#define MODE_SELECT_10_LLBAA_OFFSET 4
-#define MODE_SELECT_10_LLBAA_MASK 1
-#define MODE_SELECT_6_MPH_SIZE 4
-#define MODE_SELECT_10_MPH_SIZE 8
-#define CACHING_MODE_PAGE_WCE_MASK 0x04
-#define MODE_SENSE_BLK_DESC_ENABLED 0
-#define MODE_SENSE_BLK_DESC_COUNT 1
-#define MODE_SELECT_PAGE_CODE_MASK 0x3F
-#define SHORT_DESC_BLOCK 8
-#define LONG_DESC_BLOCK 16
-#define MODE_PAGE_POW_CND_LEN_FIELD 0x26
-#define MODE_PAGE_INF_EXC_LEN_FIELD 0x0A
-#define MODE_PAGE_CACHING_LEN_FIELD 0x12
-#define MODE_PAGE_CONTROL_LEN_FIELD 0x0A
-#define MODE_SENSE_PC_CURRENT_VALUES 0
-
-/* Log Sense defines */
-#define LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE 0x00
-#define LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH 0x07
-#define LOG_PAGE_INFORMATIONAL_EXCEPTIONS_PAGE 0x2F
-#define LOG_PAGE_TEMPERATURE_PAGE 0x0D
-#define LOG_SENSE_CDB_SP_NOT_ENABLED 0
-#define LOG_SENSE_CDB_PC_MASK 0xC0
-#define LOG_SENSE_CDB_PC_SHIFT 6
-#define LOG_SENSE_CDB_PC_CUMULATIVE_VALUES 1
-#define LOG_SENSE_CDB_PAGE_CODE_MASK 0x3F
-#define REMAINING_INFO_EXCP_PAGE_LENGTH 0x8
-#define LOG_INFO_EXCP_PAGE_LENGTH 0xC
-#define REMAINING_TEMP_PAGE_LENGTH 0xC
-#define LOG_TEMP_PAGE_LENGTH 0x10
-#define LOG_TEMP_UNKNOWN 0xFF
-#define SUPPORTED_LOG_PAGES_PAGE_LENGTH 0x3
-
-/* Read Capacity defines */
-#define READ_CAP_10_RESP_SIZE 8
-#define READ_CAP_16_RESP_SIZE 32
-
-/* NVMe Namespace and Command Defines */
-#define BYTES_TO_DWORDS 4
-#define NVME_MAX_FIRMWARE_SLOT 7
-
-/* Report LUNs defines */
-#define REPORT_LUNS_FIRST_LUN_OFFSET 8
-
-/* SCSI ADDITIONAL SENSE Codes */
-
-#define SCSI_ASC_NO_SENSE 0x00
-#define SCSI_ASC_PERIPHERAL_DEV_WRITE_FAULT 0x03
-#define SCSI_ASC_LUN_NOT_READY 0x04
-#define SCSI_ASC_WARNING 0x0B
-#define SCSI_ASC_LOG_BLOCK_GUARD_CHECK_FAILED 0x10
-#define SCSI_ASC_LOG_BLOCK_APPTAG_CHECK_FAILED 0x10
-#define SCSI_ASC_LOG_BLOCK_REFTAG_CHECK_FAILED 0x10
-#define SCSI_ASC_UNRECOVERED_READ_ERROR 0x11
-#define SCSI_ASC_MISCOMPARE_DURING_VERIFY 0x1D
-#define SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID 0x20
-#define SCSI_ASC_ILLEGAL_COMMAND 0x20
-#define SCSI_ASC_ILLEGAL_BLOCK 0x21
-#define SCSI_ASC_INVALID_CDB 0x24
-#define SCSI_ASC_INVALID_LUN 0x25
-#define SCSI_ASC_INVALID_PARAMETER 0x26
-#define SCSI_ASC_FORMAT_COMMAND_FAILED 0x31
-#define SCSI_ASC_INTERNAL_TARGET_FAILURE 0x44
-
-/* SCSI ADDITIONAL SENSE Code Qualifiers */
-
-#define SCSI_ASCQ_CAUSE_NOT_REPORTABLE 0x00
-#define SCSI_ASCQ_FORMAT_COMMAND_FAILED 0x01
-#define SCSI_ASCQ_LOG_BLOCK_GUARD_CHECK_FAILED 0x01
-#define SCSI_ASCQ_LOG_BLOCK_APPTAG_CHECK_FAILED 0x02
-#define SCSI_ASCQ_LOG_BLOCK_REFTAG_CHECK_FAILED 0x03
-#define SCSI_ASCQ_FORMAT_IN_PROGRESS 0x04
-#define SCSI_ASCQ_POWER_LOSS_EXPECTED 0x08
-#define SCSI_ASCQ_INVALID_LUN_ID 0x09
-
-/* copied from drivers/usb/gadget/function/storage_common.h */ -static inline u32 get_unaligned_be24(u8 *buf)
-{
- return 0xffffff & (u32) get_unaligned_be32(buf - 1);
-}
-
-/* Struct to gather data that needs to be extracted from a SCSI CDB.
- Not conforming to any particular CDB variant, but compatible with
all. */
-
-struct nvme_trans_io_cdb {
- u8 fua;
- u8 prot_info;
- u64 lba;
- u32 xfer_len;
-};
-
-
-/* Internal Helper Functions */
-
-
-/* Copy data to userspace memory */
-
-static int nvme_trans_copy_to_user(struct sg_io_hdr *hdr, void *from,
- unsign
ed long n)
-{
- int i;
- void *index = from;
- size_t remaining = n;
- size_t xfer_len;
-
- if (hdr->iovec_count > 0) {
- struct sg_iovec sgl;
-
- for (i = 0; i < hdr->iovec_count; i++) {
- if (copy_from_user(&sgl, hdr->dxferp +
- i * sizeof(struct
sg_iovec),
- sizeof(struct
sg_iovec)))
- return -EFAULT;
- xfer_len = min(remaining, sgl.iov_len);
- if (copy_to_user(sgl.iov_base, index,
xfer_len))
- return -EFAULT;
-
- index += xfer_len;
- remaining -= xfer_len;
- if (remaining == 0)
- break;
- }
- return 0;
- }
-
- if (copy_to_user(hdr->dxferp, from, n))
- return -EFAULT;
- return 0;
-}
-
-/* Copy data from userspace memory */
-
-static int nvme_trans_copy_from_user(struct sg_io_hdr *hdr, void *to,
- unsign
ed long n)
-{
- int i;
- void *index = to;
- size_t remaining = n;
- size_t xfer_len;
-
- if (hdr->iovec_count > 0) {
- struct sg_iovec sgl;
-
- for (i = 0; i < hdr->iovec_count; i++) {
- if (copy_from_user(&sgl, hdr->dxferp +
- i * sizeof(struct
sg_iovec),
- sizeof(struct
sg_iovec)))
- return -EFAULT;
- xfer_len = min(remaining, sgl.iov_len);
- if (copy_from_user(index, sgl.iov_base,
xfer_len))
- return -EFAULT;
- index += xfer_len;
- remaining -= xfer_len;
- if (remaining == 0)
- break;
- }
- return 0;
- }
-
- if (copy_from_user(to, hdr->dxferp, n))
- return -EFAULT;
- return 0;
-}
-
-/* Status/Sense Buffer Writeback */
-
-static int nvme_trans_completion(struct sg_io_hdr *hdr, u8 status, u8 sense_key,
- u8 asc, u8 ascq)
-{
- u8 xfer_len;
- u8 resp[DESC_FMT_SENSE_DATA_SIZE];
-
- if (scsi_status_is_good(status)) {
- hdr->status = SAM_STAT_GOOD;
- hdr->masked_status = GOOD;
- hdr->host_status = DID_OK;
- hdr->driver_status = DRIVER_OK;
- hdr->sb_len_wr = 0;
- } else {
- hdr->status = status;
- hdr->masked_status = status >> 1;
- hdr->host_status = DID_OK;
- hdr->driver_status = DRIVER_OK;
-
- memset(resp, 0, DESC_FMT_SENSE_DATA_SIZE);
- resp[0] = DESC_FORMAT_SENSE_DATA;
- resp[1] = sense_key;
- resp[2] = asc;
- resp[3] = ascq;
-
- xfer_len = min_t(u8, hdr->mx_sb_len,
DESC_FMT_SENSE_DATA_SIZE);
- hdr->sb_len_wr = xfer_len;
- if (copy_to_user(hdr->sbp, resp, xfer_len) > 0)
- return -EFAULT;
- }
-
- return 0;
-}
-
-/*
- * Take a status code from a lowlevel routine, and if it was a positive NVMe
- * error code update the sense data based on it. In either case the passed
- * in value is returned again, unless an -EFAULT from copy_to_user overrides
- * it.
- */
-static int nvme_trans_status_code(struct sg_io_hdr *hdr, int nvme_sc) -{
- u8 status, sense_key, asc, ascq;
- int res;
-
- /* For non-nvme (Linux) errors, simply return the error code
*/
- if (nvme_sc < 0)
- return nvme_sc;
-
- /* Mask DNR, More, and reserved fields */
- switch (nvme_sc & 0x7FF) {
- /* Generic Command Status */
- case NVME_SC_SUCCESS:
- status = SAM_STAT_GOOD;
- sense_key = NO_SENSE;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_INVALID_OPCODE:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_ILLEGAL_COMMAND;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_INVALID_FIELD:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_INVALID_CDB;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_DATA_XFER_ERROR:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_POWER_LOSS:
- status = SAM_STAT_TASK_ABORTED;
- sense_key = ABORTED_COMMAND;
- asc = SCSI_ASC_WARNING;
- ascq = SCSI_ASCQ_POWER_LOSS_EXPECTED;
- break;
- case NVME_SC_INTERNAL:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = HARDWARE_ERROR;
- asc = SCSI_ASC_INTERNAL_TARGET_FAILURE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_ABORT_REQ:
- status = SAM_STAT_TASK_ABORTED;
- sense_key = ABORTED_COMMAND;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_ABORT_QUEUE:
- status = SAM_STAT_TASK_ABORTED;
- sense_key = ABORTED_COMMAND;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_FUSED_FAIL:
- status = SAM_STAT_TASK_ABORTED;
- sense_key = ABORTED_COMMAND;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_FUSED_MISSING:
- status = SAM_STAT_TASK_ABORTED;
- sense_key = ABORTED_COMMAND;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_INVALID_NS:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID;
- ascq = SCSI_ASCQ_INVALID_LUN_ID;
- break;
- case NVME_SC_LBA_RANGE:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_ILLEGAL_BLOCK;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_CAP_EXCEEDED:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_NS_NOT_READY:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = NOT_READY;
- asc = SCSI_ASC_LUN_NOT_READY;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
-
- /* Command Specific Status */
- case NVME_SC_INVALID_FORMAT:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_FORMAT_COMMAND_FAILED;
- ascq = SCSI_ASCQ_FORMAT_COMMAND_FAILED;
- break;
- case NVME_SC_BAD_ATTRIBUTES:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_INVALID_CDB;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
-
- /* Media Errors */
- case NVME_SC_WRITE_FAULT:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_PERIPHERAL_DEV_WRITE_FAULT;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_READ_ERROR:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_UNRECOVERED_READ_ERROR;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_GUARD_CHECK:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_LOG_BLOCK_GUARD_CHECK_FAILED;
- ascq = SCSI_ASCQ_LOG_BLOCK_GUARD_CHECK_FAILED;
- break;
- case NVME_SC_APPTAG_CHECK:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_LOG_BLOCK_APPTAG_CHECK_FAILED;
- ascq = SCSI_ASCQ_LOG_BLOCK_APPTAG_CHECK_FAILED;
- break;
- case NVME_SC_REFTAG_CHECK:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MEDIUM_ERROR;
- asc = SCSI_ASC_LOG_BLOCK_REFTAG_CHECK_FAILED;
- ascq = SCSI_ASCQ_LOG_BLOCK_REFTAG_CHECK_FAILED;
- break;
- case NVME_SC_COMPARE_FAILED:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = MISCOMPARE;
- asc = SCSI_ASC_MISCOMPARE_DURING_VERIFY;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- case NVME_SC_ACCESS_DENIED:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_ACCESS_DENIED_INVALID_LUN_ID;
- ascq = SCSI_ASCQ_INVALID_LUN_ID;
- break;
-
- /* Unspecified/Default */
- case NVME_SC_CMDID_CONFLICT:
- case NVME_SC_CMD_SEQ_ERROR:
- case NVME_SC_CQ_INVALID:
- case NVME_SC_QID_INVALID:
- case NVME_SC_QUEUE_SIZE:
- case NVME_SC_ABORT_LIMIT:
- case NVME_SC_ABORT_MISSING:
- case NVME_SC_ASYNC_LIMIT:
- case NVME_SC_FIRMWARE_SLOT:
- case NVME_SC_FIRMWARE_IMAGE:
- case NVME_SC_INVALID_VECTOR:
- case NVME_SC_INVALID_LOG_PAGE:
- default:
- status = SAM_STAT_CHECK_CONDITION;
- sense_key = ILLEGAL_REQUEST;
- asc = SCSI_ASC_NO_SENSE;
- ascq = SCSI_ASCQ_CAUSE_NOT_REPORTABLE;
- break;
- }
-
- res = nvme_trans_completion(hdr, status, sense_key, asc,
ascq);
- return res ? res : nvme_sc;
-}
-
-/* INQUIRY Helper Functions */
-
-static int nvme_trans_standard_inquiry_page(struct nvme_ns *ns,
- struct sg_io_hdr *hdr, u8
*inq_response,
- int alloc_len)
-{
- struct nvme_dev *dev = ns->dev;
- struct nvme_id_ns *id_ns;
- int res;
- int nvme_sc;
- int xfer_len;
- u8 resp_data_format = 0x02;
- u8 protect;
- u8 cmdque = 0x01 << 1;
- u8 fw_offset = sizeof(dev->firmware_rev);
-
- /* nvme ns identify - use DPS value for PROTECT field */
- nvme_sc = nvme_identify_ns(dev, ns->ns_id, &id_ns);
- res = nvme_trans_status_code(hdr, nvme_sc);
- if (res)
- return res;
-
- if (id_ns->dps)
- protect = 0x01;
- else
- protect = 0;
- kfree(id_ns);
-
- memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
- inq_response[2] = VERSION_SPC_4;
- inq_response[3] = resp_data_format; /*normaca=0 | hisup=0
*/
- inq_response[4] = ADDITIONAL_STD_INQ_LENGTH;
- inq_response[5] = protect; /* sccs=0 | acc=0 | tpgs=0 |
pc3=0 */
- inq_response[7] = cmdque; /* wbus16=0 | sync=0 | vs=0 */
- strncpy(&inq_response[8], "NVMe ", 8);
- strncpy(&inq_response[16], dev->model, 16);
-
- while (dev->firmware_rev[fw_offset - 1] == ' ' && fw_offset >
4)
- fw_offset--;
- fw_offset -= 4;
- strncpy(&inq_response[32], dev->firmware_rev + fw_offset, 4);
-
- xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
- return nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
-}
-
-static int nvme_trans_supported_vpd_pages(struct nvme_ns *ns,
- struct sg_io_hdr *hdr, u8
*inq_response,
- int alloc_len)
-{
- int xfer_len;
-
- memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
- inq_response[1] = INQ_SUPPORTED_VPD_PAGES_PAGE; /* Page Code
*/
- inq_response[3] = INQ_NUM_SUPPORTED_VPD_PAGES; /* Page
Length */
- inq_response[4] = INQ_SUPPORTED_VPD_PAGES_PAGE;
- inq_response[5] = INQ_UNIT_SERIAL_NUMBER_PAGE;
- inq_response[6] = INQ_DEVICE_IDENTIFICATION_PAGE;
- inq_response[7] = INQ_EXTENDED_INQUIRY_DATA_PAGE;
- inq_response[8] = INQ_BDEV_CHARACTERISTICS_PAGE;
- inq_response[9] = INQ_BDEV_LIMITS_PAGE;
-
- xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
- return nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
-}
-
-static int nvme_trans_unit_serial_page(struct nvme_ns *ns,
- struct sg_io_hdr *hdr, u8
*inq_response,
- int alloc_len)
-{
- struct nvme_dev *dev = ns->dev;
- int xfer_len;
-
- memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
- inq_response[1] = INQ_UNIT_SERIAL_NUMBER_PAGE; /* Page Code */
- inq_response[3] = INQ_SERIAL_NUMBER_LENGTH; /* Page Length
*/
- strncpy(&inq_response[4], dev->serial,
INQ_SERIAL_NUMBER_LENGTH);
-
- xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
- return nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
-}
-
-static int nvme_trans_device_id_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
- u8 *inq_response, int
alloc_len)
-{
- struct nvme_dev *dev = ns->dev;
- int res;
- int nvme_sc;
- int xfer_len;
- __be32 tmp_id = cpu_to_be32(ns->ns_id);
-
- memset(inq_response, 0, alloc_len);
- inq_response[1] = INQ_DEVICE_IDENTIFICATION_PAGE; /* Page
Code */
- if (readl(&dev->bar->vs) >= NVME_VS(1, 1)) {
- struct nvme_id_ns *id_ns;
- void *eui;
- int len;
-
- nvme_sc = nvme_identify_ns(dev, ns->ns_id, &id_ns);
- res = nvme_trans_status_code(hdr, nvme_sc);
- if (res)
- return res;
-
- eui = id_ns->eui64;
- len = sizeof(id_ns->eui64);
- if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) {
- if (bitmap_empty(eui, len * 8)) {
- eui = id_ns->nguid;
- len = sizeof(id_ns->nguid);
- }
- }
- if (bitmap_empty(eui, len * 8)) {
- kfree(id_ns);
- goto scsi_string;
- }
-
- inq_response[3] = 4 + len; /* Page Length */
- /* Designation Descriptor start */
- inq_response[4] = 0x01; /* Proto ID=0h | Code
set=1h */
- inq_response[5] = 0x02; /* PIV=0b | Asso=00b |
Designator Type=2h */
- inq_response[6] = 0x00; /* Rsvd */
- inq_response[7] = len; /* Designator Length */
- memcpy(&inq_response[8], eui, len);
- kfree(id_ns);
- } else {
- scsi_string:
- if (alloc_len < 72) {
- return nvme_trans_completion(hdr,
- SAM_STAT_CHECK_CONDITION,
- ILLEGAL_REQUEST,
SCSI_ASC_INVALID_CDB,
- SCSI_ASCQ_CAUSE_NOT_REPORTABLE
);
- }
- inq_response[3] = 0x48; /* Page Length */
- /* Designation Descriptor start */
- inq_response[4] = 0x03; /* Proto ID=0h | Code
set=3h */
- inq_response[5] = 0x08; /* PIV=0b | Asso=00b |
Designator Type=8h */
- inq_response[6] = 0x00; /* Rsvd */
- inq_response[7] = 0x44; /* Designator Length */
-
- sprintf(&inq_response[8], "%04x", to_pci_dev(dev->dev)
->vendor);
- memcpy(&inq_response[12], dev->model, sizeof(dev
->model));
- sprintf(&inq_response[52], "%04x", tmp_id);
- memcpy(&inq_response[56], dev->serial, sizeof(dev
->serial));
- }
- xfer_len = alloc_len;
- return nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
-}
-
-static int nvme_trans_ext_inq_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
- int alloc_len)
-{
- u8 *inq_response;
- int res;
- int nvme_sc;
- struct nvme_dev *dev = ns->dev;
- struct nvme_id_ctrl *id_ctrl;
- struct nvme_id_ns *id_ns;
- int xfer_len;
- u8 microcode = 0x80;
- u8 spt;
- u8 spt_lut[8] = {0, 0, 2, 1, 4, 6, 5, 7};
- u8 grd_chk, app_chk, ref_chk, protect;
- u8 uask_sup = 0x20;
- u8 v_sup;
- u8 luiclr = 0x01;
-
- inq_response = kmalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH,
GFP_KERNEL);
- if (inq_response == NULL)
- return -ENOMEM;
-
- nvme_sc = nvme_identify_ns(dev, ns->ns_id, &id_ns);
- res = nvme_trans_status_code(hdr, nvme_sc);
- if (res)
- goto out_free_inq;
-
- spt = spt_lut[id_ns->dpc & 0x07] << 3;
- if (id_ns->dps)
- protect = 0x01;
- else
- protect = 0;
- kfree(id_ns);
-
- grd_chk = protect << 2;
- app_chk = protect << 1;
- ref_chk = protect;
-
- nvme_sc = nvme_identify_ctrl(dev, &id_ctrl);
- res = nvme_trans_status_code(hdr, nvme_sc);
- if (res)
- goto out_free_inq;
-
- v_sup = id_ctrl->vwc;
- kfree(id_ctrl);
-
- memset(inq_response, 0, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
- inq_response[1] = INQ_EXTENDED_INQUIRY_DATA_PAGE; /* Page
Code */
- inq_response[2] = 0x00; /* Page Length MSB */
- inq_response[3] = 0x3C; /* Page Length LSB */
- inq_response[4] = microcode | spt | grd_chk | app_chk |
ref_chk;
- inq_response[5] = uask_sup;
- inq_response[6] = v_sup;
- inq_response[7] = luiclr;
- inq_response[8] = 0;
- inq_response[9] = 0;
-
- xfer_len = min(alloc_len, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
- res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
-
- out_free_inq:
- kfree(inq_response);
- return res;
-}
-
-static int nvme_trans_bdev_limits_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
- u8 *inq_response, int
alloc_len)
-{
- __be32 max_sectors = cpu_to_be32(
- nvme_block_nr(ns, queue_max_hw_sectors(ns->queue)));
- __be32 max_discard = cpu_to_be32(ns->queue
->limits.max_discard_sectors);
- __be32 discard_desc_count = cpu_to_be32(0x100);
-
- memset(inq_response, 0, STANDARD_INQUIRY_LENGTH);
- inq_response[1] = VPD_BLOCK_LIMITS;
- inq_response[3] = 0x3c; /* Page Length */
- memcpy(&inq_response[8], &max_sectors, sizeof(u32));
- memcpy(&inq_response[20], &max_discard, sizeof(u32));
-
- if (max_discard)
- memcpy(&inq_response[24], &discard_desc_count,
sizeof(u32));
-
- return nvme_trans_copy_to_user(hdr, inq_response, 0x3c);
-}
-
-static int nvme_trans_bdev_char_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
- int alloc_len)
-{
- u8 *inq_response;
- int res;
- int xfer_len;
-
- inq_response = kzalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH,
GFP_KERNEL);
- if (inq_response == NULL) {
- res = -ENOMEM;
- goto out_mem;
- }
-
- inq_response[1] = INQ_BDEV_CHARACTERISTICS_PAGE; /* Page
Code */

-	inq_response[2] = 0x00;    /* Page Length MSB */
-	inq_response[3] = 0x3C;    /* Page Length LSB */
-	inq_response[4] = 0x00;    /* Medium Rotation Rate MSB */
-	inq_response[5] = 0x01;    /* Medium Rotation Rate LSB */
-	inq_response[6] = 0x00;    /* Form Factor */

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new file mode 100644
index 0000000..7668dd4
@@ -0,0 +1,28 @@
+config BLK_DEV_NVME
+	tristate "NVM Express block device"
+	---help---
+	  The NVM Express driver is for solid state drives directly
+	  connected to a PCI or PCI Express bus.  If you know you
+	  don't have one of these, it is safe to answer N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called nvme.
+
+config NVME_INCLUDE_PCI
+	bool "Include Local PCIe Support"
+	depends on BLK_DEV_NVME && PCI
+	default y
+	---help---
+	  The NVM Express driver is for solid state drives directly
+	  connected to the local PCI or PCI Express bus.  If you know
+	  you don't have one of these, it is safe to answer N.
+
+config NVME_PCI
+	tristate "PCI Support"
+	depends on NVME_INCLUDE_PCI
+	default y
+	---help---
+	  choose y to have Local PCI support in the NVM Express

5 lines not shown · raw message

new file mode 100644
index 0000000..c4351cf
@@ -0,0 +1,15 @@
+obj-$(CONFIG_BLK_DEV_NVME)	+= nvme.o
+
+ifeq ("$(CONFIG_NVME_PCI)","m")
+  obj-$(CONFIG_BLK_DEV_NVME)	+= nvme_pci.o
+endif
+
+nvme-y				:= core.o scsi.o
+
+ifeq ("$(CONFIG_NVME_PCI)","m")
+  nvme_pci-y			+= pci.o
+else
+  ifeq ("$(CONFIG_NVME_PCI)","y")
+    nvme-y			+= pci.o
+  endif
+endif

new file mode 100644
index 0000000..202d876
@@ -0,0 +1,167 @@
+/*
+ * Definitions for the NVM Express interface
+ * Copyright (c) 2011-2014, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or

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new file mode 100644
index 0000000..d934969
@@ -0,0 +1,2804 @@
+/*
+ * NVM Express device driver
+ * Copyright (c) 2011-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or

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new file mode 100644
index 0000000..16df7ca
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ *

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new file mode 100644
index 0000000..d1f2a8f
@@ -0,0 +1,981 @@
+/*
+ * Copyright (c) 2011-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or

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new file mode 100644
index 0000000..030d29b
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ *

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new file mode 100644
index 0000000..3d58ea9
@@ -0,0 +1,2538 @@
+/*
+ * Copyright (c) 2011-2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or

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Part of this message is not shown here. View the raw message.

Hi J,

thanks for starting this important work, but I think we need to do this in smaller steps. This large patch does a few things at the same time:

- move files to a new directory
- split data structures
- split files
- introduces a new internal API

Which need to be split over a few patches. I'd suggest we start with the easiest and most important parts first and then iterate through the rest.

My suggestion would be:

a) move files to a new directory. My suggestion for that would be driver/nvme/host/ as I have a software NVMe controller implementation under development which I'd like to also add under a different subdirectory of drivers/nvme.
b) start splitting struct nvme_dev into a generic struct nvme_ctrl and a PCI-specific nvme_pci_ctrl

Based on that we can start thinking about an API and move the PCI code to it's own file. Note that most of your operations should not be needed. With my ongoing work we now have the nvme_submit*cmd* APIs that give a nice separatation for anything related to NVMe commans, so we'd just need abstractions for the BAR access.

Yes, we debated if this should be one big patch or break it up into smaller patches.

Would that directory be slightly confusing name as the split implementation in this patch can still be used as the NVMe PCIe driver for SSD devices inside a given computer (laptop, PC, etc)? I have no issue with the name, just posing a question.

OK, we can start looking at this. JayS and Phil who are cc'ed in this email are two important people that did the heavy lifting of this patch.

I can see that. However we started with the split we had just out of the concern for backwards compatibility and worry of breaking something with the initial split. There was the thought we can optimize some of the operations and remove them on future patches on operations that we know are safe to remove.

Host is what the NVMe spec uses when referring to the computer housing the NVMe card, that's why I came up with it. But I'm open for alternate suggestions.

If you look at the NVMe spec we're basically down to two sort of
operations: NVMe commands, and MMIO read/write access to the main BAR, so those seem the most important abstraction. My nvme_command passthrough through struct request takes care of the first, so some {read,write}_bar_{32,64} ops seem to be most important ops. Depending on how exactly the initialization path is structured there might be a frw more, but I'd tend towards duplicating a bit more in doubt there initially.

Note that I've done a pre-"NVMe over Fabrics" RDMA transport and a nvme-loop driver that directy injects commands from a front end driver into a virtual controller about a year ago, and both fit this scheme pretty well, as does the virtio-nvme code from Ming.

What's the "software NVMe controller"? Is it the initiator for NVMe over fabrics?

Nice. I'll possibly have a virtio-specific nvme_virtio_ctrl.

It's a software implementation of the NVMe subsystem and controller interface. It could be frontended by a future fabrics implementation, a virtio-nvme implementation, a nvme-loop implementation or with some additional work maybe even a Linux-based PCIe target device.

Hi Christoph,

I have been writing vhost-nvme driver for a while.
http://www.minggr.net/cgit/cgit.cgi/linux/commit/?h=vhost-nvme/v1

Seems I have to do similar submission/completion queue simulation in vhost-nvme as in qemu/nvme.c.

Will the "software NVMe controller" do these simulation?
If yes, could you share a draft version then I can try build vhost-nvme on top of it?

Thanks.

I'd call it impementation, but not simulation, but otherwise yes. I'll talk to the people in charge as I think joining forces would be very useful.