mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
rsxx: Restructured DMA cancel scheme.
Before, DMAs would never be cancelled if there was a data stall or an EEH Permenant failure which would cause an unrecoverable I/O hang. The DMA cancellation mechanism has been modified to fix these issues and allows DMAs to be cancelled during the above mentioned events. Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Philip J Kelleher
Jens Axboe
parent
a3299ab185
commit
0ab4743ebc
@ -368,15 +368,26 @@ static void rsxx_eeh_failure(struct pci_dev *dev)
|
||||
{
|
||||
struct rsxx_cardinfo *card = pci_get_drvdata(dev);
|
||||
int i;
|
||||
int cnt = 0;
|
||||
|
||||
dev_err(&dev->dev, "IBM FlashSystem PCI: disabling failed card.\n");
|
||||
|
||||
card->eeh_state = 1;
|
||||
card->halt = 1;
|
||||
|
||||
for (i = 0; i < card->n_targets; i++)
|
||||
del_timer_sync(&card->ctrl[i].activity_timer);
|
||||
for (i = 0; i < card->n_targets; i++) {
|
||||
spin_lock_bh(&card->ctrl[i].queue_lock);
|
||||
cnt = rsxx_cleanup_dma_queue(&card->ctrl[i],
|
||||
&card->ctrl[i].queue);
|
||||
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
||||
|
||||
rsxx_eeh_cancel_dmas(card);
|
||||
cnt += rsxx_dma_cancel(&card->ctrl[i]);
|
||||
|
||||
if (cnt)
|
||||
dev_info(CARD_TO_DEV(card),
|
||||
"Freed %d queued DMAs on channel %d\n",
|
||||
cnt, card->ctrl[i].id);
|
||||
}
|
||||
}
|
||||
|
||||
static int rsxx_eeh_fifo_flush_poll(struct rsxx_cardinfo *card)
|
||||
|
||||
@ -155,7 +155,8 @@ static void bio_dma_done_cb(struct rsxx_cardinfo *card,
|
||||
atomic_set(&meta->error, 1);
|
||||
|
||||
if (atomic_dec_and_test(&meta->pending_dmas)) {
|
||||
disk_stats_complete(card, meta->bio, meta->start_time);
|
||||
if (!card->eeh_state && card->gendisk)
|
||||
disk_stats_complete(card, meta->bio, meta->start_time);
|
||||
|
||||
bio_endio(meta->bio, atomic_read(&meta->error) ? -EIO : 0);
|
||||
kmem_cache_free(bio_meta_pool, meta);
|
||||
@ -196,7 +197,8 @@ static void rsxx_make_request(struct request_queue *q, struct bio *bio)
|
||||
atomic_set(&bio_meta->pending_dmas, 0);
|
||||
bio_meta->start_time = jiffies;
|
||||
|
||||
disk_stats_start(card, bio);
|
||||
if (!unlikely(card->halt))
|
||||
disk_stats_start(card, bio);
|
||||
|
||||
dev_dbg(CARD_TO_DEV(card), "BIO[%c]: meta: %p addr8: x%llx size: %d\n",
|
||||
bio_data_dir(bio) ? 'W' : 'R', bio_meta,
|
||||
|
||||
@ -245,6 +245,22 @@ static void rsxx_complete_dma(struct rsxx_dma_ctrl *ctrl,
|
||||
kmem_cache_free(rsxx_dma_pool, dma);
|
||||
}
|
||||
|
||||
int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl,
|
||||
struct list_head *q)
|
||||
{
|
||||
struct rsxx_dma *dma;
|
||||
struct rsxx_dma *tmp;
|
||||
int cnt = 0;
|
||||
|
||||
list_for_each_entry_safe(dma, tmp, q, list) {
|
||||
list_del(&dma->list);
|
||||
rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
|
||||
cnt++;
|
||||
}
|
||||
|
||||
return cnt;
|
||||
}
|
||||
|
||||
static void rsxx_requeue_dma(struct rsxx_dma_ctrl *ctrl,
|
||||
struct rsxx_dma *dma)
|
||||
{
|
||||
@ -252,9 +268,9 @@ static void rsxx_requeue_dma(struct rsxx_dma_ctrl *ctrl,
|
||||
* Requeued DMAs go to the front of the queue so they are issued
|
||||
* first.
|
||||
*/
|
||||
spin_lock(&ctrl->queue_lock);
|
||||
spin_lock_bh(&ctrl->queue_lock);
|
||||
list_add(&dma->list, &ctrl->queue);
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
spin_unlock_bh(&ctrl->queue_lock);
|
||||
}
|
||||
|
||||
static void rsxx_handle_dma_error(struct rsxx_dma_ctrl *ctrl,
|
||||
@ -329,6 +345,7 @@ static void rsxx_handle_dma_error(struct rsxx_dma_ctrl *ctrl,
|
||||
static void dma_engine_stalled(unsigned long data)
|
||||
{
|
||||
struct rsxx_dma_ctrl *ctrl = (struct rsxx_dma_ctrl *)data;
|
||||
int cnt;
|
||||
|
||||
if (atomic_read(&ctrl->stats.hw_q_depth) == 0 ||
|
||||
unlikely(ctrl->card->eeh_state))
|
||||
@ -349,6 +366,18 @@ static void dma_engine_stalled(unsigned long data)
|
||||
"DMA channel %d has stalled, faulting interface.\n",
|
||||
ctrl->id);
|
||||
ctrl->card->dma_fault = 1;
|
||||
|
||||
/* Clean up the DMA queue */
|
||||
spin_lock(&ctrl->queue_lock);
|
||||
cnt = rsxx_cleanup_dma_queue(ctrl, &ctrl->queue);
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
|
||||
cnt += rsxx_dma_cancel(ctrl);
|
||||
|
||||
if (cnt)
|
||||
dev_info(CARD_TO_DEV(ctrl->card),
|
||||
"Freed %d queued DMAs on channel %d\n",
|
||||
cnt, ctrl->id);
|
||||
}
|
||||
}
|
||||
|
||||
@ -368,22 +397,22 @@ static void rsxx_issue_dmas(struct work_struct *work)
|
||||
return;
|
||||
|
||||
while (1) {
|
||||
spin_lock(&ctrl->queue_lock);
|
||||
spin_lock_bh(&ctrl->queue_lock);
|
||||
if (list_empty(&ctrl->queue)) {
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
spin_unlock_bh(&ctrl->queue_lock);
|
||||
break;
|
||||
}
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
spin_unlock_bh(&ctrl->queue_lock);
|
||||
|
||||
tag = pop_tracker(ctrl->trackers);
|
||||
if (tag == -1)
|
||||
break;
|
||||
|
||||
spin_lock(&ctrl->queue_lock);
|
||||
spin_lock_bh(&ctrl->queue_lock);
|
||||
dma = list_entry(ctrl->queue.next, struct rsxx_dma, list);
|
||||
list_del(&dma->list);
|
||||
ctrl->stats.sw_q_depth--;
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
spin_unlock_bh(&ctrl->queue_lock);
|
||||
|
||||
/*
|
||||
* This will catch any DMAs that slipped in right before the
|
||||
@ -520,33 +549,10 @@ static void rsxx_dma_done(struct work_struct *work)
|
||||
rsxx_enable_ier(ctrl->card, CR_INTR_DMA(ctrl->id));
|
||||
spin_unlock_irqrestore(&ctrl->card->irq_lock, flags);
|
||||
|
||||
spin_lock(&ctrl->queue_lock);
|
||||
spin_lock_bh(&ctrl->queue_lock);
|
||||
if (ctrl->stats.sw_q_depth)
|
||||
queue_work(ctrl->issue_wq, &ctrl->issue_dma_work);
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
}
|
||||
|
||||
static int rsxx_cleanup_dma_queue(struct rsxx_cardinfo *card,
|
||||
struct list_head *q)
|
||||
{
|
||||
struct rsxx_dma *dma;
|
||||
struct rsxx_dma *tmp;
|
||||
int cnt = 0;
|
||||
|
||||
list_for_each_entry_safe(dma, tmp, q, list) {
|
||||
list_del(&dma->list);
|
||||
|
||||
if (dma->dma_addr)
|
||||
pci_unmap_page(card->dev, dma->dma_addr,
|
||||
get_dma_size(dma),
|
||||
(dma->cmd == HW_CMD_BLK_WRITE) ?
|
||||
PCI_DMA_TODEVICE :
|
||||
PCI_DMA_FROMDEVICE);
|
||||
kmem_cache_free(rsxx_dma_pool, dma);
|
||||
cnt++;
|
||||
}
|
||||
|
||||
return cnt;
|
||||
spin_unlock_bh(&ctrl->queue_lock);
|
||||
}
|
||||
|
||||
static int rsxx_queue_discard(struct rsxx_cardinfo *card,
|
||||
@ -698,10 +704,10 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
|
||||
|
||||
for (i = 0; i < card->n_targets; i++) {
|
||||
if (!list_empty(&dma_list[i])) {
|
||||
spin_lock(&card->ctrl[i].queue_lock);
|
||||
spin_lock_bh(&card->ctrl[i].queue_lock);
|
||||
card->ctrl[i].stats.sw_q_depth += dma_cnt[i];
|
||||
list_splice_tail(&dma_list[i], &card->ctrl[i].queue);
|
||||
spin_unlock(&card->ctrl[i].queue_lock);
|
||||
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
||||
|
||||
queue_work(card->ctrl[i].issue_wq,
|
||||
&card->ctrl[i].issue_dma_work);
|
||||
@ -711,8 +717,11 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
|
||||
return 0;
|
||||
|
||||
bvec_err:
|
||||
for (i = 0; i < card->n_targets; i++)
|
||||
rsxx_cleanup_dma_queue(card, &dma_list[i]);
|
||||
for (i = 0; i < card->n_targets; i++) {
|
||||
spin_lock_bh(&card->ctrl[i].queue_lock);
|
||||
rsxx_cleanup_dma_queue(&card->ctrl[i], &dma_list[i]);
|
||||
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
||||
}
|
||||
|
||||
return st;
|
||||
}
|
||||
@ -918,13 +927,30 @@ failed_dma_setup:
|
||||
return st;
|
||||
}
|
||||
|
||||
int rsxx_dma_cancel(struct rsxx_dma_ctrl *ctrl)
|
||||
{
|
||||
struct rsxx_dma *dma;
|
||||
int i;
|
||||
int cnt = 0;
|
||||
|
||||
/* Clean up issued DMAs */
|
||||
for (i = 0; i < RSXX_MAX_OUTSTANDING_CMDS; i++) {
|
||||
dma = get_tracker_dma(ctrl->trackers, i);
|
||||
if (dma) {
|
||||
atomic_dec(&ctrl->stats.hw_q_depth);
|
||||
rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
|
||||
push_tracker(ctrl->trackers, i);
|
||||
cnt++;
|
||||
}
|
||||
}
|
||||
|
||||
return cnt;
|
||||
}
|
||||
|
||||
void rsxx_dma_destroy(struct rsxx_cardinfo *card)
|
||||
{
|
||||
struct rsxx_dma_ctrl *ctrl;
|
||||
struct rsxx_dma *dma;
|
||||
int i, j;
|
||||
int cnt = 0;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < card->n_targets; i++) {
|
||||
ctrl = &card->ctrl[i];
|
||||
@ -943,33 +969,11 @@ void rsxx_dma_destroy(struct rsxx_cardinfo *card)
|
||||
del_timer_sync(&ctrl->activity_timer);
|
||||
|
||||
/* Clean up the DMA queue */
|
||||
spin_lock(&ctrl->queue_lock);
|
||||
cnt = rsxx_cleanup_dma_queue(card, &ctrl->queue);
|
||||
spin_unlock(&ctrl->queue_lock);
|
||||
spin_lock_bh(&ctrl->queue_lock);
|
||||
rsxx_cleanup_dma_queue(ctrl, &ctrl->queue);
|
||||
spin_unlock_bh(&ctrl->queue_lock);
|
||||
|
||||
if (cnt)
|
||||
dev_info(CARD_TO_DEV(card),
|
||||
"Freed %d queued DMAs on channel %d\n",
|
||||
cnt, i);
|
||||
|
||||
/* Clean up issued DMAs */
|
||||
for (j = 0; j < RSXX_MAX_OUTSTANDING_CMDS; j++) {
|
||||
dma = get_tracker_dma(ctrl->trackers, j);
|
||||
if (dma) {
|
||||
pci_unmap_page(card->dev, dma->dma_addr,
|
||||
get_dma_size(dma),
|
||||
(dma->cmd == HW_CMD_BLK_WRITE) ?
|
||||
PCI_DMA_TODEVICE :
|
||||
PCI_DMA_FROMDEVICE);
|
||||
kmem_cache_free(rsxx_dma_pool, dma);
|
||||
cnt++;
|
||||
}
|
||||
}
|
||||
|
||||
if (cnt)
|
||||
dev_info(CARD_TO_DEV(card),
|
||||
"Freed %d pending DMAs on channel %d\n",
|
||||
cnt, i);
|
||||
rsxx_dma_cancel(ctrl);
|
||||
|
||||
vfree(ctrl->trackers);
|
||||
|
||||
@ -1013,7 +1017,7 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
|
||||
cnt++;
|
||||
}
|
||||
|
||||
spin_lock(&card->ctrl[i].queue_lock);
|
||||
spin_lock_bh(&card->ctrl[i].queue_lock);
|
||||
list_splice(&issued_dmas[i], &card->ctrl[i].queue);
|
||||
|
||||
atomic_sub(cnt, &card->ctrl[i].stats.hw_q_depth);
|
||||
@ -1028,7 +1032,7 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
|
||||
PCI_DMA_TODEVICE :
|
||||
PCI_DMA_FROMDEVICE);
|
||||
}
|
||||
spin_unlock(&card->ctrl[i].queue_lock);
|
||||
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
||||
}
|
||||
|
||||
kfree(issued_dmas);
|
||||
@ -1036,30 +1040,13 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
|
||||
return 0;
|
||||
}
|
||||
|
||||
void rsxx_eeh_cancel_dmas(struct rsxx_cardinfo *card)
|
||||
{
|
||||
struct rsxx_dma *dma;
|
||||
struct rsxx_dma *tmp;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < card->n_targets; i++) {
|
||||
spin_lock(&card->ctrl[i].queue_lock);
|
||||
list_for_each_entry_safe(dma, tmp, &card->ctrl[i].queue, list) {
|
||||
list_del(&dma->list);
|
||||
|
||||
rsxx_complete_dma(&card->ctrl[i], dma, DMA_CANCELLED);
|
||||
}
|
||||
spin_unlock(&card->ctrl[i].queue_lock);
|
||||
}
|
||||
}
|
||||
|
||||
int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card)
|
||||
{
|
||||
struct rsxx_dma *dma;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < card->n_targets; i++) {
|
||||
spin_lock(&card->ctrl[i].queue_lock);
|
||||
spin_lock_bh(&card->ctrl[i].queue_lock);
|
||||
list_for_each_entry(dma, &card->ctrl[i].queue, list) {
|
||||
dma->dma_addr = pci_map_page(card->dev, dma->page,
|
||||
dma->pg_off, get_dma_size(dma),
|
||||
@ -1067,12 +1054,12 @@ int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card)
|
||||
PCI_DMA_TODEVICE :
|
||||
PCI_DMA_FROMDEVICE);
|
||||
if (!dma->dma_addr) {
|
||||
spin_unlock(&card->ctrl[i].queue_lock);
|
||||
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
||||
kmem_cache_free(rsxx_dma_pool, dma);
|
||||
return -ENOMEM;
|
||||
}
|
||||
}
|
||||
spin_unlock(&card->ctrl[i].queue_lock);
|
||||
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
@ -39,6 +39,7 @@
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/timer.h>
|
||||
#include <linux/ioctl.h>
|
||||
#include <linux/delay.h>
|
||||
|
||||
#include "rsxx.h"
|
||||
#include "rsxx_cfg.h"
|
||||
@ -374,6 +375,8 @@ typedef void (*rsxx_dma_cb)(struct rsxx_cardinfo *card,
|
||||
int rsxx_dma_setup(struct rsxx_cardinfo *card);
|
||||
void rsxx_dma_destroy(struct rsxx_cardinfo *card);
|
||||
int rsxx_dma_init(void);
|
||||
int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl, struct list_head *q);
|
||||
int rsxx_dma_cancel(struct rsxx_dma_ctrl *ctrl);
|
||||
void rsxx_dma_cleanup(void);
|
||||
void rsxx_dma_queue_reset(struct rsxx_cardinfo *card);
|
||||
int rsxx_dma_configure(struct rsxx_cardinfo *card);
|
||||
@ -384,7 +387,6 @@ int rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
|
||||
void *cb_data);
|
||||
int rsxx_hw_buffers_init(struct pci_dev *dev, struct rsxx_dma_ctrl *ctrl);
|
||||
int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card);
|
||||
void rsxx_eeh_cancel_dmas(struct rsxx_cardinfo *card);
|
||||
int rsxx_eeh_remap_dmas(struct rsxx_cardinfo *card);
|
||||
|
||||
/***** cregs.c *****/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user