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rsxx: Moving pci_map_page to prevent overflow.

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The pci_map_page function has been moved into our
issued workqueue to prevent an us running out of
mappable addresses on non-HWWD PCIe x8 slots. The
maximum amount that can possible be mapped at one
time now is: 255 dmas X 4 dma channels X 4096 Bytes.

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 2013-09-04 13:59:35 -05:00 committed by Jens Axboe
parent e5feab229f
commit 1b21f5b2ad
2 changed files with 28 additions and 47 deletions
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5
drivers/block/rsxx/core.c
View File

@ -749,10 +749,6 @@ static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
card->eeh_state = 0;
st = rsxx_eeh_remap_dmas(card);
if (st)
goto failed_remap_dmas;
spin_lock_irqsave(&card->irq_lock, flags);
if (card->n_targets & RSXX_MAX_TARGETS)
rsxx_enable_ier_and_isr(card, CR_INTR_ALL_G);
@ -779,7 +775,6 @@ static pci_ers_result_t rsxx_slot_reset(struct pci_dev *dev)
return PCI_ERS_RESULT_RECOVERED;
failed_hw_buffers_init:
failed_remap_dmas:
for (i = 0; i < card->n_targets; i++) {
if (card->ctrl[i].status.buf)
pci_free_consistent(card->dev,

70
drivers/block/rsxx/dma.c
View File

@ -397,6 +397,7 @@ static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl)
int tag;
int cmds_pending = 0;
struct hw_cmd *hw_cmd_buf;
int dir;
hw_cmd_buf = ctrl->cmd.buf;
@ -433,6 +434,28 @@ static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl)
continue;
}
if (dma->cmd == HW_CMD_BLK_WRITE)
dir = PCI_DMA_TODEVICE;
else
dir = PCI_DMA_FROMDEVICE;
/*
* The function pci_map_page is placed here because we can
* only, by design, issue up to 255 commands to the hardware
* at one time per DMA channel. So the maximum amount of mapped
* memory would be 255 * 4 channels * 4096 Bytes which is less
* than 2GB, the limit of a x8 Non-HWWD PCIe slot. This way the
* pci_map_page function should never fail because of a
* lack of mappable memory.
*/
dma->dma_addr = pci_map_page(ctrl->card->dev, dma->page,
dma->pg_off, dma->sub_page.cnt << 9, dir);
if (pci_dma_mapping_error(ctrl->card->dev, dma->dma_addr)) {
push_tracker(ctrl->trackers, tag);
rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
continue;
}
set_tracker_dma(ctrl->trackers, tag, dma);
hw_cmd_buf[ctrl->cmd.idx].command = dma->cmd;
hw_cmd_buf[ctrl->cmd.idx].tag = tag;
@ -629,14 +652,6 @@ static int rsxx_queue_dma(struct rsxx_cardinfo *card,
if (!dma)
return -ENOMEM;
dma->dma_addr = pci_map_page(card->dev, page, pg_off, dma_len,
dir ? PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(card->dev, dma->dma_addr)) {
kmem_cache_free(rsxx_dma_pool, dma);
return -ENOMEM;
}
dma->cmd = dir ? HW_CMD_BLK_WRITE : HW_CMD_BLK_READ;
dma->laddr = laddr;
dma->sub_page.off = (dma_off >> 9);
@ -1039,6 +1054,11 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
else
card->ctrl[i].stats.reads_issued--;
pci_unmap_page(card->dev, dma->dma_addr,
get_dma_size(dma),
dma->cmd == HW_CMD_BLK_WRITE ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
list_add_tail(&dma->list, &issued_dmas[i]);
push_tracker(card->ctrl[i].trackers, j);
cnt++;
@ -1050,15 +1070,6 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
atomic_sub(cnt, &card->ctrl[i].stats.hw_q_depth);
card->ctrl[i].stats.sw_q_depth += cnt;
card->ctrl[i].e_cnt = 0;
list_for_each_entry(dma, &card->ctrl[i].queue, list) {
if (!pci_dma_mapping_error(card->dev, 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);
}
spin_unlock_bh(&card->ctrl[i].queue_lock);
}
@ -1067,31 +1078,6 @@ int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
return 0;
}
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_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),
dma->cmd == HW_CMD_BLK_WRITE ?
PCI_DMA_TODEVICE :
PCI_DMA_FROMDEVICE);
if (pci_dma_mapping_error(card->dev, dma->dma_addr)) {
spin_unlock_bh(&card->ctrl[i].queue_lock);
kmem_cache_free(rsxx_dma_pool, dma);
return -ENOMEM;
}
}
spin_unlock_bh(&card->ctrl[i].queue_lock);
}
return 0;
}
int rsxx_dma_init(void)
{
rsxx_dma_pool = KMEM_CACHE(rsxx_dma, SLAB_HWCACHE_ALIGN);