Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29BD7348C4C for ; Tue, 8 Sep 2026 16:01:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788883294; cv=none; b=qqfGgyTdDEYleUdfliH5XKuNk4sWNub+/AMvpPNaFP9Y8ycMuhjw2huvWPxy0d2RiIacwC6RxPkTHZQdMnODTseeJYKcBz6pcrEWmC8nSqQCnwl8QipgD/JYfb7Ey+43SzhptAIKzSPFyzf+nrmG9xiPc4CbNEJ9E4U9T8ET6kM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788883294; c=relaxed/simple; bh=CZ10qi7t4W/Tfm4WSaxi7tVJUkkKH/S0mWK1eG2Mu/Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sY2JVejYVNI92T+HqdMcmUa/38c53IGfqNaqSM9zTwd2LqhVpR/RdSWPpBbRicbhp4Xba8Wx014V7r9uQhNQ/cfLgmr03X5XU+K8iqM1sopNs2XahJDXC3CXPHfNTTtIQE/gpOoe4A5uOViZtUQFytNxwFS9N+ZZKQ0LLafaOCs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NsO6jO3U; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NsO6jO3U" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BD9D31F00A3E; Tue, 8 Sep 2026 16:01:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788883291; bh=qxoDc0+qfPS9ybWltVfi/qoGgyz1yv7O6ttSnYwzCjQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=NsO6jO3UF5o4JKTySgB4JpVgb6gTsghyko4KTPiWrTO1lNQfBb55QAZDT/4kGOTa0 8i68t5BOFPUgXR8wV9p1ol2YOLd+nnUOBo94LuCzuke8CZ4iCL8zPcYUCew5aUy9Ff lQFa/XG235jepPkCG8vlA/b5lN5WXj0ESnKhh/N8eG0moxzFPyoKijkObp9Bw/kqxt uGzmzxEJ/owxNycgecdUy11JZZAGfkSMHVDrGKg583e4MBPgW9GDt6RFs1/3/bN49z Doyvivm8PgJZHDJdiSVvcRYkuNw+ApNyClN3Gc3yAZQp02v/xVD/aY93YgTrgIQlKm ISmglo7gLoyYg== From: Sasha Levin To: stable@vger.kernel.org Cc: Dave Jiang , Robert Richter , Joshua Hahn , Jonathan Cameron , Alison Schofield , Terry Bowman , Dan Williams , Sasha Levin Subject: [PATCH 6.12.y 3/4] cxl/pci: Remove CXL VH handling in CONFIG_PCIEAER_CXL conditional blocks from core/pci.c Date: Tue, 8 Sep 2026 12:01:26 -0400 Message-ID: <20260908160127.2548313-3-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260908160127.2548313-1-sashal@kernel.org> References: <2026090317-roundish-company-df16@gregkh> <20260908160127.2548313-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Dave Jiang [ Upstream commit 7ff8b1d60881c5f97b5ae426e14d2822917d3b69 ] Create new config CONFIG_CXL_RAS and put all CXL RAS items behind the config. The config will depend on CPER and PCIE AER to build. Move the related VH RAS code from core/pci.c to core/ras.c. Restricted CXL host (RCH) RAS functions will be moved in a future patch. Cc: Robert Richter Reviewed-by: Joshua Hahn Reviewed-by: Jonathan Cameron Signed-off-by: Dave Jiang Reviewed-by: Alison Schofield Co-developed-by: Terry Bowman Signed-off-by: Terry Bowman Reviewed-by: Dan Williams Link: https://patch.msgid.link/20260114182055.46029-8-terry.bowman@amd.com Signed-off-by: Dan Williams Signed-off-by: Dave Jiang [ Stable backport note: The 6.12 tree does not have the upstream CPER/GHES ras.c base. Move only the existing VH handlers into ras.c and fold the later RCH split into ras_rch.c so the target fix applies there. ] Stable-dep-of: 9d399526128b ("cxl/ras: Fix cxl_rch_get_aer_severity() wrong severity register") Signed-off-by: Sasha Levin --- drivers/cxl/Kconfig | 4 + drivers/cxl/core/Makefile | 2 + drivers/cxl/core/core.h | 23 +++ drivers/cxl/core/pci.c | 296 ------------------------------------- drivers/cxl/core/ras.c | 184 +++++++++++++++++++++++ drivers/cxl/core/ras_rch.c | 121 +++++++++++++++ drivers/cxl/cxl.h | 8 - drivers/cxl/cxlpci.h | 16 ++ tools/testing/cxl/Kbuild | 2 + 9 files changed, 352 insertions(+), 304 deletions(-) create mode 100644 drivers/cxl/core/ras.c create mode 100644 drivers/cxl/core/ras_rch.c diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index 876469e23f7a7..fd236a67ac762 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -146,4 +146,8 @@ config CXL_REGION_INVALIDATION_TEST If unsure, or if this kernel is meant for production environments, say N. +config CXL_RAS + def_bool y + depends on ACPI_APEI_GHES && PCIEAER && CXL_PCI + endif diff --git a/drivers/cxl/core/Makefile b/drivers/cxl/core/Makefile index 9259bcc6773c8..b8505c63d4e74 100644 --- a/drivers/cxl/core/Makefile +++ b/drivers/cxl/core/Makefile @@ -16,3 +16,5 @@ cxl_core-y += pmu.o cxl_core-y += cdat.o cxl_core-$(CONFIG_TRACING) += trace.o cxl_core-$(CONFIG_CXL_REGION) += region.o +cxl_core-$(CONFIG_CXL_RAS) += ras.o +cxl_core-$(CONFIG_CXL_RAS) += ras_rch.o diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h index 0c62b4069ba00..08326cc72c7f5 100644 --- a/drivers/cxl/core/core.h +++ b/drivers/cxl/core/core.h @@ -8,6 +8,8 @@ extern const struct device_type cxl_nvdimm_bridge_type; extern const struct device_type cxl_nvdimm_type; extern const struct device_type cxl_pmu_type; +struct cxl_dev_state; + extern struct attribute_group cxl_base_attribute_group; #ifdef CONFIG_CXL_REGION @@ -110,4 +112,25 @@ bool cxl_need_node_perf_attrs_update(int nid); int cxl_port_get_switch_dport_bandwidth(struct cxl_port *port, struct access_coordinate *c); +#ifdef CONFIG_CXL_RAS +bool cxl_handle_ras(struct cxl_dev_state *cxlds, void __iomem *ras_base); +void cxl_handle_cor_ras(struct cxl_dev_state *cxlds, void __iomem *ras_base); + +/* Restricted CXL Host specific RAS functions */ +void cxl_dport_map_rch_aer(struct cxl_dport *dport); +void cxl_disable_rch_root_ints(struct cxl_dport *dport); +void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds); +#else +static inline bool cxl_handle_ras(struct cxl_dev_state *cxlds, + void __iomem *ras_base) +{ + return false; +} +static inline void cxl_handle_cor_ras(struct cxl_dev_state *cxlds, + void __iomem *ras_base) { } +static inline void cxl_dport_map_rch_aer(struct cxl_dport *dport) { } +static inline void cxl_disable_rch_root_ints(struct cxl_dport *dport) { } +static inline void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) { } +#endif /* CONFIG_CXL_RAS */ + #endif /* __CXL_CORE_H__ */ diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c index 42fc18878b0d6..caecc07665057 100644 --- a/drivers/cxl/core/pci.c +++ b/drivers/cxl/core/pci.c @@ -650,302 +650,6 @@ void read_cdat_data(struct cxl_port *port) } EXPORT_SYMBOL_NS_GPL(read_cdat_data, CXL); -static void cxl_handle_cor_ras(struct cxl_dev_state *cxlds, - void __iomem *ras_base) -{ - void __iomem *addr; - u32 status; - - if (!ras_base) - return; - - addr = ras_base + CXL_RAS_CORRECTABLE_STATUS_OFFSET; - status = readl(addr); - if (status & CXL_RAS_CORRECTABLE_STATUS_MASK) { - writel(status & CXL_RAS_CORRECTABLE_STATUS_MASK, addr); - trace_cxl_aer_correctable_error(cxlds->cxlmd, status); - } -} - -/* CXL spec rev3.0 8.2.4.16.1 */ -static void header_log_copy(void __iomem *ras_base, u32 *log) -{ - void __iomem *addr; - u32 *log_addr; - int i, log_u32_size = CXL_HEADERLOG_SIZE / sizeof(u32); - - addr = ras_base + CXL_RAS_HEADER_LOG_OFFSET; - log_addr = log; - - for (i = 0; i < log_u32_size; i++) { - *log_addr = readl(addr); - log_addr++; - addr += sizeof(u32); - } -} - -/* - * Log the state of the RAS status registers and prepare them to log the - * next error status. Return 1 if reset needed. - */ -static bool cxl_handle_ras(struct cxl_dev_state *cxlds, - void __iomem *ras_base) -{ - u32 hl[CXL_HEADERLOG_SIZE_U32]; - void __iomem *addr; - u32 status; - u32 fe; - - if (!ras_base) - return false; - - addr = ras_base + CXL_RAS_UNCORRECTABLE_STATUS_OFFSET; - status = readl(addr); - if (!(status & CXL_RAS_UNCORRECTABLE_STATUS_MASK)) - return false; - - /* If multiple errors, log header points to first error from ctrl reg */ - if (hweight32(status) > 1) { - void __iomem *rcc_addr = - ras_base + CXL_RAS_CAP_CONTROL_OFFSET; - - fe = BIT(FIELD_GET(CXL_RAS_CAP_CONTROL_FE_MASK, - readl(rcc_addr))); - } else { - fe = status; - } - - header_log_copy(ras_base, hl); - trace_cxl_aer_uncorrectable_error(cxlds->cxlmd, status, fe, hl); - writel(status & CXL_RAS_UNCORRECTABLE_STATUS_MASK, addr); - - return true; -} - -#ifdef CONFIG_PCIEAER_CXL - -static void cxl_dport_map_rch_aer(struct cxl_dport *dport) -{ - resource_size_t aer_phys; - struct device *host; - u16 aer_cap; - - aer_cap = cxl_rcrb_to_aer(dport->dport_dev, dport->rcrb.base); - if (aer_cap) { - host = dport->reg_map.host; - aer_phys = aer_cap + dport->rcrb.base; - dport->regs.dport_aer = devm_cxl_iomap_block(host, aer_phys, - sizeof(struct aer_capability_regs)); - } -} - -static void cxl_dport_map_ras(struct cxl_dport *dport) -{ - struct cxl_register_map *map = &dport->reg_map; - struct device *dev = dport->dport_dev; - - if (!map->component_map.ras.valid) - dev_dbg(dev, "RAS registers not found\n"); - else if (cxl_map_component_regs(map, &dport->regs.component, - BIT(CXL_CM_CAP_CAP_ID_RAS))) - dev_dbg(dev, "Failed to map RAS capability.\n"); -} - -static void cxl_disable_rch_root_ints(struct cxl_dport *dport) -{ - void __iomem *aer_base = dport->regs.dport_aer; - u32 aer_cmd_mask, aer_cmd; - - if (!aer_base) - return; - - /* - * Disable RCH root port command interrupts. - * CXL 3.0 12.2.1.1 - RCH Downstream Port-detected Errors - * - * This sequence may not be necessary. CXL spec states disabling - * the root cmd register's interrupts is required. But, PCI spec - * shows these are disabled by default on reset. - */ - aer_cmd_mask = (PCI_ERR_ROOT_CMD_COR_EN | - PCI_ERR_ROOT_CMD_NONFATAL_EN | - PCI_ERR_ROOT_CMD_FATAL_EN); - aer_cmd = readl(aer_base + PCI_ERR_ROOT_COMMAND); - aer_cmd &= ~aer_cmd_mask; - writel(aer_cmd, aer_base + PCI_ERR_ROOT_COMMAND); -} - -/** - * cxl_dport_init_ras_reporting - Setup CXL RAS report on this dport - * @dport: the cxl_dport that needs to be initialized - * @host: host device for devm operations - */ -void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host) -{ - dport->reg_map.host = host; - cxl_dport_map_ras(dport); - - if (dport->rch) { - struct pci_host_bridge *host_bridge = to_pci_host_bridge(dport->dport_dev); - - if (!host_bridge->native_aer) - return; - - cxl_dport_map_rch_aer(dport); - cxl_disable_rch_root_ints(dport); - } -} -EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, CXL); - -/* - * Copy the AER capability registers using 32 bit read accesses. - * This is necessary because RCRB AER capability is MMIO mapped. Clear the - * status after copying. - * - * @aer_base: base address of AER capability block in RCRB - * @aer_regs: destination for copying AER capability - */ -static bool cxl_rch_get_aer_info(void __iomem *aer_base, - struct aer_capability_regs *aer_regs) -{ - int read_cnt = sizeof(struct aer_capability_regs) / sizeof(u32); - u32 *aer_regs_buf = (u32 *)aer_regs; - int n; - - if (!aer_base) - return false; - - /* Use readl() to guarantee 32-bit accesses */ - for (n = 0; n < read_cnt; n++) - aer_regs_buf[n] = readl(aer_base + n * sizeof(u32)); - - writel(aer_regs->uncor_status, aer_base + PCI_ERR_UNCOR_STATUS); - writel(aer_regs->cor_status, aer_base + PCI_ERR_COR_STATUS); - - return true; -} - -/* Get AER severity. Return false if there is no error. */ -static bool cxl_rch_get_aer_severity(struct aer_capability_regs *aer_regs, - int *severity) -{ - if (aer_regs->uncor_status & ~aer_regs->uncor_mask) { - if (aer_regs->uncor_status & PCI_ERR_ROOT_FATAL_RCV) - *severity = AER_FATAL; - else - *severity = AER_NONFATAL; - return true; - } - - if (aer_regs->cor_status & ~aer_regs->cor_mask) { - *severity = AER_CORRECTABLE; - return true; - } - - return false; -} - -static void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) -{ - struct pci_dev *pdev = to_pci_dev(cxlds->dev); - struct aer_capability_regs aer_regs; - struct cxl_dport *dport; - int severity; - - struct cxl_port *port __free(put_cxl_port) = - cxl_pci_find_port(pdev, &dport); - if (!port) - return; - - if (!cxl_rch_get_aer_info(dport->regs.dport_aer, &aer_regs)) - return; - - if (!cxl_rch_get_aer_severity(&aer_regs, &severity)) - return; - - pci_print_aer(pdev, severity, &aer_regs); - - if (severity == AER_CORRECTABLE) - cxl_handle_cor_ras(cxlds, dport->regs.ras); - else - cxl_handle_ras(cxlds, dport->regs.ras); -} - -#else -static void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) { } -#endif - -void cxl_cor_error_detected(struct pci_dev *pdev) -{ - struct cxl_dev_state *cxlds = pci_get_drvdata(pdev); - struct device *dev = &cxlds->cxlmd->dev; - - scoped_guard(device, dev) { - if (!dev->driver) { - dev_warn(&pdev->dev, - "%s: memdev disabled, abort error handling\n", - dev_name(dev)); - return; - } - - if (cxlds->rcd) - cxl_handle_rdport_errors(cxlds); - - cxl_handle_cor_ras(cxlds, cxlds->regs.ras); - } -} -EXPORT_SYMBOL_NS_GPL(cxl_cor_error_detected, CXL); - -pci_ers_result_t cxl_error_detected(struct pci_dev *pdev, - pci_channel_state_t state) -{ - struct cxl_dev_state *cxlds = pci_get_drvdata(pdev); - struct cxl_memdev *cxlmd = cxlds->cxlmd; - struct device *dev = &cxlmd->dev; - bool ue; - - scoped_guard(device, dev) { - if (!dev->driver) { - dev_warn(&pdev->dev, - "%s: memdev disabled, abort error handling\n", - dev_name(dev)); - return PCI_ERS_RESULT_DISCONNECT; - } - - if (cxlds->rcd) - cxl_handle_rdport_errors(cxlds); - /* - * A frozen channel indicates an impending reset which is fatal to - * CXL.mem operation, and will likely crash the system. On the off - * chance the situation is recoverable dump the status of the RAS - * capability registers and bounce the active state of the memdev. - */ - ue = cxl_handle_ras(cxlds, cxlds->regs.ras); - } - - - switch (state) { - case pci_channel_io_normal: - if (ue) { - device_release_driver(dev); - return PCI_ERS_RESULT_NEED_RESET; - } - return PCI_ERS_RESULT_CAN_RECOVER; - case pci_channel_io_frozen: - dev_warn(&pdev->dev, - "%s: frozen state error detected, disable CXL.mem\n", - dev_name(dev)); - device_release_driver(dev); - return PCI_ERS_RESULT_NEED_RESET; - case pci_channel_io_perm_failure: - dev_warn(&pdev->dev, - "failure state error detected, request disconnect\n"); - return PCI_ERS_RESULT_DISCONNECT; - } - return PCI_ERS_RESULT_NEED_RESET; -} -EXPORT_SYMBOL_NS_GPL(cxl_error_detected, CXL); - static int cxl_flit_size(struct pci_dev *pdev) { if (cxl_pci_flit_256(pdev)) diff --git a/drivers/cxl/core/ras.c b/drivers/cxl/core/ras.c new file mode 100644 index 0000000000000..94300b1f27658 --- /dev/null +++ b/drivers/cxl/core/ras.c @@ -0,0 +1,184 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2025 AMD Corporation. All rights reserved. */ + +#include +#include +#include +#include "core.h" +#include "trace.h" + +static void cxl_dport_map_ras(struct cxl_dport *dport) +{ + struct cxl_register_map *map = &dport->reg_map; + struct device *dev = dport->dport_dev; + + if (!map->component_map.ras.valid) + dev_dbg(dev, "RAS registers not found\n"); + else if (cxl_map_component_regs(map, &dport->regs.component, + BIT(CXL_CM_CAP_CAP_ID_RAS))) + dev_dbg(dev, "Failed to map RAS capability.\n"); +} + +/** + * cxl_dport_init_ras_reporting - Setup CXL RAS report on this dport + * @dport: the cxl_dport that needs to be initialized + * @host: host device for devm operations + */ +void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host) +{ + dport->reg_map.host = host; + cxl_dport_map_ras(dport); + + if (dport->rch) { + struct pci_host_bridge *host_bridge = + to_pci_host_bridge(dport->dport_dev); + + if (!host_bridge->native_aer) + return; + + cxl_dport_map_rch_aer(dport); + cxl_disable_rch_root_ints(dport); + } +} +EXPORT_SYMBOL_NS_GPL(cxl_dport_init_ras_reporting, CXL); + +void cxl_handle_cor_ras(struct cxl_dev_state *cxlds, void __iomem *ras_base) +{ + void __iomem *addr; + u32 status; + + if (!ras_base) + return; + + addr = ras_base + CXL_RAS_CORRECTABLE_STATUS_OFFSET; + status = readl(addr); + if (status & CXL_RAS_CORRECTABLE_STATUS_MASK) { + writel(status & CXL_RAS_CORRECTABLE_STATUS_MASK, addr); + trace_cxl_aer_correctable_error(cxlds->cxlmd, status); + } +} + +/* CXL spec rev3.0 8.2.4.16.1 */ +static void header_log_copy(void __iomem *ras_base, u32 *log) +{ + void __iomem *addr; + u32 *log_addr; + int i, log_u32_size = CXL_HEADERLOG_SIZE / sizeof(u32); + + addr = ras_base + CXL_RAS_HEADER_LOG_OFFSET; + log_addr = log; + + for (i = 0; i < log_u32_size; i++) { + *log_addr = readl(addr); + log_addr++; + addr += sizeof(u32); + } +} + +/* + * Log the state of the RAS status registers and prepare them to log the + * next error status. Return 1 if reset needed. + */ +bool cxl_handle_ras(struct cxl_dev_state *cxlds, void __iomem *ras_base) +{ + u32 hl[CXL_HEADERLOG_SIZE_U32]; + void __iomem *addr; + u32 status; + u32 fe; + + if (!ras_base) + return false; + + addr = ras_base + CXL_RAS_UNCORRECTABLE_STATUS_OFFSET; + status = readl(addr); + if (!(status & CXL_RAS_UNCORRECTABLE_STATUS_MASK)) + return false; + + /* If multiple errors, log header points to first error from ctrl reg */ + if (hweight32(status) > 1) { + void __iomem *rcc_addr = + ras_base + CXL_RAS_CAP_CONTROL_OFFSET; + + fe = BIT(FIELD_GET(CXL_RAS_CAP_CONTROL_FE_MASK, + readl(rcc_addr))); + } else { + fe = status; + } + + header_log_copy(ras_base, hl); + trace_cxl_aer_uncorrectable_error(cxlds->cxlmd, status, fe, hl); + writel(status & CXL_RAS_UNCORRECTABLE_STATUS_MASK, addr); + + return true; +} + +void cxl_cor_error_detected(struct pci_dev *pdev) +{ + struct cxl_dev_state *cxlds = pci_get_drvdata(pdev); + struct device *dev = &cxlds->cxlmd->dev; + + scoped_guard(device, dev) { + if (!dev->driver) { + dev_warn(&pdev->dev, + "%s: memdev disabled, abort error handling\n", + dev_name(dev)); + return; + } + + if (cxlds->rcd) + cxl_handle_rdport_errors(cxlds); + + cxl_handle_cor_ras(cxlds, cxlds->regs.ras); + } +} +EXPORT_SYMBOL_NS_GPL(cxl_cor_error_detected, CXL); + +pci_ers_result_t cxl_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct cxl_dev_state *cxlds = pci_get_drvdata(pdev); + struct cxl_memdev *cxlmd = cxlds->cxlmd; + struct device *dev = &cxlmd->dev; + bool ue; + + scoped_guard(device, dev) { + if (!dev->driver) { + dev_warn(&pdev->dev, + "%s: memdev disabled, abort error handling\n", + dev_name(dev)); + return PCI_ERS_RESULT_DISCONNECT; + } + + if (cxlds->rcd) + cxl_handle_rdport_errors(cxlds); + /* + * A frozen channel indicates an impending reset which is fatal to + * CXL.mem operation, and will likely crash the system. On the off + * chance the situation is recoverable dump the status of the RAS + * capability registers and bounce the active state of the memdev. + */ + ue = cxl_handle_ras(cxlds, cxlds->regs.ras); + } + + + switch (state) { + case pci_channel_io_normal: + if (ue) { + device_release_driver(dev); + return PCI_ERS_RESULT_NEED_RESET; + } + return PCI_ERS_RESULT_CAN_RECOVER; + case pci_channel_io_frozen: + dev_warn(&pdev->dev, + "%s: frozen state error detected, disable CXL.mem\n", + dev_name(dev)); + device_release_driver(dev); + return PCI_ERS_RESULT_NEED_RESET; + case pci_channel_io_perm_failure: + dev_warn(&pdev->dev, + "failure state error detected, request disconnect\n"); + return PCI_ERS_RESULT_DISCONNECT; + } + return PCI_ERS_RESULT_NEED_RESET; +} +EXPORT_SYMBOL_NS_GPL(cxl_error_detected, CXL); diff --git a/drivers/cxl/core/ras_rch.c b/drivers/cxl/core/ras_rch.c new file mode 100644 index 0000000000000..ed58afd18ecc9 --- /dev/null +++ b/drivers/cxl/core/ras_rch.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2025 AMD Corporation. All rights reserved. */ + +#include +#include +#include "cxl.h" +#include "core.h" +#include "cxlmem.h" + +void cxl_dport_map_rch_aer(struct cxl_dport *dport) +{ + resource_size_t aer_phys; + struct device *host; + u16 aer_cap; + + aer_cap = cxl_rcrb_to_aer(dport->dport_dev, dport->rcrb.base); + if (aer_cap) { + host = dport->reg_map.host; + aer_phys = aer_cap + dport->rcrb.base; + dport->regs.dport_aer = + devm_cxl_iomap_block(host, aer_phys, + sizeof(struct aer_capability_regs)); + } +} + +void cxl_disable_rch_root_ints(struct cxl_dport *dport) +{ + void __iomem *aer_base = dport->regs.dport_aer; + u32 aer_cmd_mask, aer_cmd; + + if (!aer_base) + return; + + /* + * Disable RCH root port command interrupts. + * CXL 3.0 12.2.1.1 - RCH Downstream Port-detected Errors + * + * This sequence may not be necessary. CXL spec states disabling + * the root cmd register's interrupts is required. But, PCI spec + * shows these are disabled by default on reset. + */ + aer_cmd_mask = (PCI_ERR_ROOT_CMD_COR_EN | + PCI_ERR_ROOT_CMD_NONFATAL_EN | + PCI_ERR_ROOT_CMD_FATAL_EN); + aer_cmd = readl(aer_base + PCI_ERR_ROOT_COMMAND); + aer_cmd &= ~aer_cmd_mask; + writel(aer_cmd, aer_base + PCI_ERR_ROOT_COMMAND); +} + +/* + * Copy the AER capability registers using 32 bit read accesses. + * This is necessary because RCRB AER capability is MMIO mapped. Clear the + * status after copying. + * + * @aer_base: base address of AER capability block in RCRB + * @aer_regs: destination for copying AER capability + */ +static bool cxl_rch_get_aer_info(void __iomem *aer_base, + struct aer_capability_regs *aer_regs) +{ + int read_cnt = sizeof(struct aer_capability_regs) / sizeof(u32); + u32 *aer_regs_buf = (u32 *)aer_regs; + int n; + + if (!aer_base) + return false; + + /* Use readl() to guarantee 32-bit accesses */ + for (n = 0; n < read_cnt; n++) + aer_regs_buf[n] = readl(aer_base + n * sizeof(u32)); + + writel(aer_regs->uncor_status, aer_base + PCI_ERR_UNCOR_STATUS); + writel(aer_regs->cor_status, aer_base + PCI_ERR_COR_STATUS); + + return true; +} + +/* Get AER severity. Return false if there is no error. */ +static bool cxl_rch_get_aer_severity(struct aer_capability_regs *aer_regs, + int *severity) +{ + if (aer_regs->uncor_status & ~aer_regs->uncor_mask) { + if (aer_regs->uncor_status & PCI_ERR_ROOT_FATAL_RCV) + *severity = AER_FATAL; + else + *severity = AER_NONFATAL; + return true; + } + + if (aer_regs->cor_status & ~aer_regs->cor_mask) { + *severity = AER_CORRECTABLE; + return true; + } + + return false; +} + +void cxl_handle_rdport_errors(struct cxl_dev_state *cxlds) +{ + struct pci_dev *pdev = to_pci_dev(cxlds->dev); + struct aer_capability_regs aer_regs; + struct cxl_dport *dport; + int severity; + + struct cxl_port *port __free(put_cxl_port) = + cxl_pci_find_port(pdev, &dport); + if (!port) + return; + + if (!cxl_rch_get_aer_info(dport->regs.dport_aer, &aer_regs)) + return; + + if (!cxl_rch_get_aer_severity(&aer_regs, &severity)) + return; + + pci_print_aer(pdev, severity, &aer_regs); + if (severity == AER_CORRECTABLE) + cxl_handle_cor_ras(cxlds, dport->regs.ras); + else + cxl_handle_ras(cxlds, dport->regs.ras); +} diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 490394c84aee3..a82272f299998 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -763,14 +763,6 @@ struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port, struct device *dport_dev, int port_id, resource_size_t rcrb); -#ifdef CONFIG_PCIEAER_CXL -void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport); -void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host); -#else -static inline void cxl_dport_init_ras_reporting(struct cxl_dport *dport, - struct device *host) { } -#endif - struct cxl_decoder *to_cxl_decoder(struct device *dev); struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev); struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev); diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h index 4da07727ab9cd..ddd142259bd44 100644 --- a/drivers/cxl/cxlpci.h +++ b/drivers/cxl/cxlpci.h @@ -126,7 +126,23 @@ struct cxl_dev_state; int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm, struct cxl_endpoint_dvsec_info *info); void read_cdat_data(struct cxl_port *port); + +#ifdef CONFIG_CXL_RAS void cxl_cor_error_detected(struct pci_dev *pdev); pci_ers_result_t cxl_error_detected(struct pci_dev *pdev, pci_channel_state_t state); +void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host); +#else +static inline void cxl_cor_error_detected(struct pci_dev *pdev) { } + +static inline pci_ers_result_t cxl_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + return PCI_ERS_RESULT_NONE; +} + +static inline void cxl_dport_init_ras_reporting(struct cxl_dport *dport, + struct device *host) { } +#endif + #endif /* __CXL_PCI_H__ */ diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild index b1256fee3567f..d9fc64abe279e 100644 --- a/tools/testing/cxl/Kbuild +++ b/tools/testing/cxl/Kbuild @@ -63,6 +63,8 @@ cxl_core-y += $(CXL_CORE_SRC)/pmu.o cxl_core-y += $(CXL_CORE_SRC)/cdat.o cxl_core-$(CONFIG_TRACING) += $(CXL_CORE_SRC)/trace.o cxl_core-$(CONFIG_CXL_REGION) += $(CXL_CORE_SRC)/region.o +cxl_core-$(CONFIG_CXL_RAS) += $(CXL_CORE_SRC)/ras.o +cxl_core-$(CONFIG_CXL_RAS) += $(CXL_CORE_SRC)/ras_rch.o cxl_core-y += config_check.o cxl_core-y += cxl_core_test.o cxl_core-y += cxl_core_exports.o -- 2.53.0