fix MTD CFI/LPDDR flash driver huge latency bug
PATCH 1/1 fix MTD CFI/LPDDR flash driver huge latency bug
This patch fix a huge latency problem in the MTD CFI and LPDDR flash drivers.
The use of a memcpy() during a spinlock operation will cause very long thread context switch delays if the flash chip bandwidth is low and the data to be copied large, because a spinlock will disable preemption.
For example: A flash with 6,5 MB/s bandwidth will cause under ubifs, which request sometimes 128 KB (the flash erase size), a preemption delay of 20 milliseconds. High priority threads will not be served during this time, regardless whether this threads access the flash or not. This behavior breaks real time.
The patch change all the use of spin_lock operations for xxxx->mutex into mutex operations, which is exact what the name says and means.
There is no performance regression since the mutex is normally not acquired.
The patch is against kernel 2.6.33. Please merge it.
--- drivers/mtd/chips/cfi_cmdset_0001.c | 131 +++++++++++++++++----------------- drivers/mtd/chips/cfi_cmdset_0002.c | 127 +++++++++++++++++---------------- drivers/mtd/chips/cfi_cmdset_0020.c | 136 ++++++++++++++++++------------------ drivers/mtd/chips/gen_probe.c | 3 drivers/mtd/lpddr/lpddr_cmds.c | 79 ++++++++++---------- include/linux/mtd/flashchip.h | 4 - 6 files changed, 240 insertions(+), 240 deletions(-)
drivers/mtd/chips/cfi_cmdset_0001.c renamed from /drivers/mtd/chips/cfi_cmdset_0001.c +65 -66
@@ -727,8 +727,7 @@ static int cfi_intelext_partition_fixup(/* those should be reset too since they create memory references. */ init_waitqueue_head (&chip->wq); -spin_lock_init (&chip->_spinlock); - chip->mutex = &chip->_spinlock; +mutex_init (&chip->mutex); chip++; } }
@@ -774,9 +773,9 @@ static int chip_ready (struct map_info *if (chip->priv &&map_word_andequal (map, status, status_PWS, status_PWS))break ; -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);cfi_udelay (1 ); -spin_lock (chip->mutex); +mutex_lock (chip->mutex);/* Someone else might have been playing with it. */ return -EAGAIN ; }
@@ -823,9 +822,9 @@ static int chip_ready (struct map_info *return -EIO ; } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);cfi_udelay (1 ); -spin_lock (chip->mutex); +mutex_lock (chip->mutex);/* Nobody will touch it while it's in state FL_ERASE_SUSPENDING. So we can just loop here. */ }
@@ -852,10 +851,10 @@ static int chip_ready (struct map_info * sleep:set_current_state (TASK_UNINTERRUPTIBLE );add_wait_queue (&chip->wq, &wait); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);schedule ();remove_wait_queue (&chip->wq, &wait); -spin_lock (chip->mutex); +mutex_lock (chip->mutex);return -EAGAIN ; } }
@@ -901,20 +900,20 @@ static int get_chip(struct map_info *map* it'll happily send us to sleep. In any case, when * get_chip returns success we're clear to go ahead. */ - ret =spin_trylock (contender->mutex); + ret =mutex_trylock (contender->mutex);spin_unlock (&shared->lock);if (!ret) goto retry; -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); ret =chip_ready (map, contender, contender->start, mode); -spin_lock (chip->mutex); +mutex_lock (chip->mutex);if (ret == -EAGAIN ) { -spin_unlock (contender->mutex); +mutex_unlock (contender->mutex); goto retry; }if (ret) { -spin_unlock (contender->mutex); +mutex_unlock (contender->mutex);return ret; }spin_lock (&shared->lock);
@@ -923,10 +922,10 @@ static int get_chip(struct map_info *map* in FL_SYNCING state. Put contender and retry. */ if (chip->state ==FL_SYNCING ) {put_chip (map, contender, contender->start); -spin_unlock (contender->mutex); +mutex_unlock (contender->mutex); goto retry; } -spin_unlock (contender->mutex); +mutex_unlock (contender->mutex); }/* Check if we already have suspended erase
@@ -936,10 +935,10 @@ static int get_chip(struct map_info *mapspin_unlock (&shared->lock);set_current_state (TASK_UNINTERRUPTIBLE );add_wait_queue (&chip->wq, &wait); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);schedule ();remove_wait_queue (&chip->wq, &wait); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); goto retry; }
@@ -969,12 +968,12 @@ static void put_chip(struct map_info *maif (shared->writing && shared->writing != chip) {/* give back ownership to who we loaned it from */ struct flchip *loaner = shared->writing; -spin_lock (loaner->mutex); +mutex_lock (loaner->mutex);spin_unlock (&shared->lock); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);put_chip (map, loaner, loaner->start); -spin_lock (chip->mutex); -spin_unlock (loaner->mutex); +mutex_lock (chip->mutex); +mutex_unlock (loaner->mutex);wake_up (&chip->wq);return ; }
@@ -1144,7 +1143,7 @@ static int __xipram xip_wait_for_operati (void )map_read (map, adr);xip_iprefetch ();local_irq_enable (); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);xip_iprefetch ();cond_resched ();
@@ -1154,15 +1153,15 @@ static int __xipram xip_wait_for_operati* a suspended erase state. If so let's wait * until it's done. */ -spin_lock (chip->mutex); +mutex_lock (chip->mutex);while (chip->state != newstate) {DECLARE_WAITQUEUE (wait, current);set_current_state (TASK_UNINTERRUPTIBLE );add_wait_queue (&chip->wq, &wait); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);schedule ();remove_wait_queue (&chip->wq, &wait); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); }/* Disallow XIP again */ local_irq_disable ();
@@ -1218,10 +1217,10 @@ static int inval_cache_and_wait_for_operint chip_state = chip->state;unsigned int timeo, sleep_time, reset_timeo; -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);if (inval_len)INVALIDATE_CACHED_RANGE (map, inval_adr, inval_len); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); timeo = chip_op_time_max;if (!timeo)
@@ -1241,7 +1240,7 @@ static int inval_cache_and_wait_for_oper }/* OK Still waiting. Drop the lock, wait a while and retry. */ -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);if (sleep_time >=1000000 /HZ ) {/* * Half of the normal delay still remaining
@@ -1256,17 +1255,17 @@ static int inval_cache_and_wait_for_opercond_resched (); timeo--; } -spin_lock (chip->mutex); +mutex_lock (chip->mutex);while (chip->state != chip_state) {/* Someone's suspended the operation: sleep */ DECLARE_WAITQUEUE (wait, current);set_current_state (TASK_UNINTERRUPTIBLE );add_wait_queue (&chip->wq, &wait); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);schedule ();remove_wait_queue (&chip->wq, &wait); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); }if (chip->erase_suspended && chip_state ==FL_ERASING ) {/* Erase suspend occured while sleep: reset timeout */
@@ -1302,7 +1301,7 @@ static int do_point_onechip (struct map_/* Ensure cmd read/writes are aligned. */ cmd_addr = adr & ~(map_bankwidth (map)-1 ); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, cmd_addr,FL_POINT );
@@ -1313,7 +1312,7 @@ static int do_point_onechip (struct map_ chip->state =FL_POINT ; chip->ref_point_counter++; } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1398,7 +1397,7 @@ static void cfi_intelext_unpoint(structelse thislen = len; -spin_lock (chip->mutex); +mutex_lock (chip->mutex);if (chip->state ==FL_POINT ) { chip->ref_point_counter--;if (chip->ref_point_counter ==0 )
@@ -1407,7 +1406,7 @@ static void cfi_intelext_unpoint(structprintk (KERN_ERR "%s: Warning: unpoint called on non pointed region\n" , map->name);/* Should this give an error? */ put_chip (map, chip, chip->start); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); len -= thislen; ofs =0 ;
@@ -1426,10 +1425,10 @@ static inline int do_read_onechip(struct/* Ensure cmd read/writes are aligned. */ cmd_addr = adr & ~(map_bankwidth (map)-1 ); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, cmd_addr,FL_READY );if (ret) { -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1443,7 +1442,7 @@ static inline int do_read_onechip(structput_chip (map, chip, cmd_addr); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return 0 ; }
@@ -1506,10 +1505,10 @@ static int __xipram do_write_oneword(strreturn -EINVAL ; } -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, adr, mode);if (ret) { -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1555,7 +1554,7 @@ static int __xipram do_write_oneword(strxip_enable (map, chip, adr); out:put_chip (map, chip, adr); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1664,10 +1663,10 @@ static int __xipram do_write_buffer(stru/* Let's determine this according to the interleave only once */ write_cmd = (cfi->cfiq->P_ID !=0x0200 ) ?CMD (0xe8 ) :CMD (0xe9 ); -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, cmd_adr,FL_WRITING );if (ret) { -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1798,7 +1797,7 @@ static int __xipram do_write_buffer(struxip_enable (map, chip, cmd_adr); out:put_chip (map, chip, cmd_adr); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1877,10 +1876,10 @@ static int __xipram do_erase_oneblock(st adr += chip->start; retry: -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, adr,FL_ERASING );if (ret) { -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1936,7 +1935,7 @@ static int __xipram do_erase_oneblock(st }else if (chipstatus &0x20 && retries--) {printk (KERN_DEBUG "block erase failed at 0x%08lx: status 0x%lx. Retrying...\n" , adr, chipstatus);put_chip (map, chip, adr); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); goto retry; }else {printk (KERN_ERR "%s: block erase failed at 0x%08lx (status 0x%lx)\n" , map->name, adr, chipstatus);
@@ -1948,7 +1947,7 @@ static int __xipram do_erase_oneblock(stxip_enable (map, chip, adr); out:put_chip (map, chip, adr); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -1981,7 +1980,7 @@ static void cfi_intelext_sync (struct mtfor (i=0 ; !ret && i<cfi->numchips; i++) { chip = &cfi->chips[i]; -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, chip->start,FL_SYNCING );if (!ret) {
@@ -1992,7 +1991,7 @@ static void cfi_intelext_sync (struct mt* with the chip now anyway. */ } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); }/* Unlock the chips again */
@@ -2000,14 +1999,14 @@ static void cfi_intelext_sync (struct mtfor (i--; i >=0 ; i--) { chip = &cfi->chips[i]; -spin_lock (chip->mutex); +mutex_lock (chip->mutex);if (chip->state ==FL_SYNCING ) { chip->state = chip->oldstate; chip->oldstate =FL_READY ;wake_up (&chip->wq); } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); } }
@@ -2053,10 +2052,10 @@ static int __xipram do_xxlock_oneblock(s adr += chip->start; -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, adr,FL_LOCKING );if (ret) { -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -2090,7 +2089,7 @@ static int __xipram do_xxlock_oneblock(sxip_enable (map, chip, adr); out:put_chip (map, chip, adr); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -2155,10 +2154,10 @@ do_otp_read(struct map_info *map, structstruct cfi_private *cfi = map->fldrv_priv;int ret; -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, chip->start,FL_JEDEC_QUERY );if (ret) { -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return ret; }
@@ -2177,7 +2176,7 @@ do_otp_read(struct map_info *map, structINVALIDATE_CACHED_RANGE (map, chip->start + offset, size);put_chip (map, chip, chip->start); -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex);return 0 ; }
@@ -2452,7 +2451,7 @@ static int cfi_intelext_suspend(struct mfor (i=0 ; !ret && i<cfi->numchips; i++) { chip = &cfi->chips[i]; -spin_lock (chip->mutex); +mutex_lock (chip->mutex);switch (chip->state) {case FL_READY :
@@ -2484,7 +2483,7 @@ static int cfi_intelext_suspend(struct mcase FL_PM_SUSPENDED :break ; } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); }/* Unlock the chips again */
@@ -2493,7 +2492,7 @@ static int cfi_intelext_suspend(struct mfor (i--; i >=0 ; i--) { chip = &cfi->chips[i]; -spin_lock (chip->mutex); +mutex_lock (chip->mutex);if (chip->state ==FL_PM_SUSPENDED ) {/* No need to force it into a known state here,
@@ -2503,7 +2502,7 @@ static int cfi_intelext_suspend(struct m chip->oldstate =FL_READY ;wake_up (&chip->wq); } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); } }
@@ -2544,7 +2543,7 @@ static void cfi_intelext_resume(struct m chip = &cfi->chips[i]; -spin_lock (chip->mutex); +mutex_lock (chip->mutex);/* Go to known state. Chip may have been power cycled */ if (chip->state ==FL_PM_SUSPENDED ) {
@@ -2553,7 +2552,7 @@ static void cfi_intelext_resume(struct mwake_up (&chip->wq); } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); } if ((mtd->flags & MTD_POWERUP_LOCK)
@@ -2573,14 +2572,14 @@ static int cfi_intelext_reset(struct mtd/* force the completion of any ongoing operation and switch to array mode so any bootloader in flash is accessible for soft reboot. */ -spin_lock (chip->mutex); +mutex_lock (chip->mutex); ret =get_chip (map, chip, chip->start,FL_SHUTDOWN );if (!ret) {map_write (map,CMD (0xff ), chip->start); chip->state =FL_SHUTDOWN ;put_chip (map, chip, chip->start); } -spin_unlock (chip->mutex); +mutex_unlock (chip->mutex); }return 0 ;
drivers/mtd/chips/cfi_cmdset_0002.c renamed from /drivers/mtd/chips/cfi_cmdset_0002.c +65 -62
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drivers/mtd/chips/cfi_cmdset_0020.c renamed from /drivers/mtd/chips/cfi_cmdset_0020.c +68 -68
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drivers/mtd/chips/gen_probe.c renamed from /drivers/mtd/chips/gen_probe.c +1 -2
@@ -155,8 +155,7 @@ static struct cfi_private *genprobe_iden pchip->start = (i << cfi.chipshift); pchip->state =FL_READY ;init_waitqueue_head (&pchip->wq); -spin_lock_init (&pchip->_spinlock); - pchip->mutex = &pchip->_spinlock; +mutex_init (pchip->mutex); } }
drivers/mtd/lpddr/lpddr_cmds.c renamed from /drivers/mtd/lpddr/lpddr_cmds.c +39 -40
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include/linux/mtd/flashchip.h renamed from /include/linux/mtd/flashchip.h +2 -2
@@ -15,6 +15,7 @@* has asm/spinlock.h, or 2.4, which has linux/spinlock.h */ #include <linux/sched.h> +#include <linux/mutex.h> typedef enum { FL_READY,
@@ -74,8 +75,7 @@ struct flchip { unsigned int erase_suspended:1;unsigned long in_progress_block_addr; -spinlock_t *mutex; -spinlock_t _spinlock;/* We do it like this because sometimes they'll be shared. */ +struct mutex mutex[1 ];wait_queue_head_t wq;/* Wait on here when we're waiting for the chip to be ready */ int word_write_time;