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Merge branch 'topic/ioatdma' into for-linus

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This commit is contained in:
Vinod Koul 2015-10-31 07:37:13 +05:30
commit 212dac5665
4 changed files with 152 additions and 5 deletions
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3
drivers/dma/ioat/dma.c
View File

@ -197,7 +197,8 @@ static void __ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
void ioat_start_null_desc(struct ioatdma_chan *ioat_chan)
{
spin_lock_bh(&ioat_chan->prep_lock);
__ioat_start_null_desc(ioat_chan);
if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
__ioat_start_null_desc(ioat_chan);
spin_unlock_bh(&ioat_chan->prep_lock);
}

6
drivers/dma/ioat/dma.h
View File

@ -82,8 +82,9 @@ struct ioatdma_device {
struct dma_pool *sed_hw_pool[MAX_SED_POOLS];
struct dma_device dma_dev;
u8 version;
struct msix_entry msix_entries[4];
struct ioatdma_chan *idx[4];
#define IOAT_MAX_CHANS 4
struct msix_entry msix_entries[IOAT_MAX_CHANS];
struct ioatdma_chan *idx[IOAT_MAX_CHANS];
struct dca_provider *dca;
enum ioat_irq_mode irq_mode;
u32 cap;
@ -95,6 +96,7 @@ struct ioatdma_chan {
dma_addr_t last_completion;
spinlock_t cleanup_lock;
unsigned long state;
#define IOAT_CHAN_DOWN 0
#define IOAT_COMPLETION_ACK 1
#define IOAT_RESET_PENDING 2
#define IOAT_KOBJ_INIT_FAIL 3

114
drivers/dma/ioat/init.c
View File

@ -27,6 +27,7 @@
#include <linux/workqueue.h>
#include <linux/prefetch.h>
#include <linux/dca.h>
#include <linux/aer.h>
#include "dma.h"
#include "registers.h"
#include "hw.h"
@ -1186,13 +1187,116 @@ static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
return 0;
}
static void ioat_shutdown(struct pci_dev *pdev)
{
struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
struct ioatdma_chan *ioat_chan;
int i;
if (!ioat_dma)
return;
for (i = 0; i < IOAT_MAX_CHANS; i++) {
ioat_chan = ioat_dma->idx[i];
if (!ioat_chan)
continue;
spin_lock_bh(&ioat_chan->prep_lock);
set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
del_timer_sync(&ioat_chan->timer);
spin_unlock_bh(&ioat_chan->prep_lock);
/* this should quiesce then reset */
ioat_reset_hw(ioat_chan);
}
ioat_disable_interrupts(ioat_dma);
}
void ioat_resume(struct ioatdma_device *ioat_dma)
{
struct ioatdma_chan *ioat_chan;
u32 chanerr;
int i;
for (i = 0; i < IOAT_MAX_CHANS; i++) {
ioat_chan = ioat_dma->idx[i];
if (!ioat_chan)
continue;
spin_lock_bh(&ioat_chan->prep_lock);
clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
spin_unlock_bh(&ioat_chan->prep_lock);
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
/* no need to reset as shutdown already did that */
}
}
#define DRV_NAME "ioatdma"
static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev,
enum pci_channel_state error)
{
dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error);
/* quiesce and block I/O */
ioat_shutdown(pdev);
return PCI_ERS_RESULT_NEED_RESET;
}
static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev)
{
pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED;
int err;
dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME);
if (pci_enable_device_mem(pdev) < 0) {
dev_err(&pdev->dev,
"Failed to enable PCIe device after reset.\n");
result = PCI_ERS_RESULT_DISCONNECT;
} else {
pci_set_master(pdev);
pci_restore_state(pdev);
pci_save_state(pdev);
pci_wake_from_d3(pdev, false);
}
err = pci_cleanup_aer_uncorrect_error_status(pdev);
if (err) {
dev_err(&pdev->dev,
"AER uncorrect error status clear failed: %#x\n", err);
}
return result;
}
static void ioat_pcie_error_resume(struct pci_dev *pdev)
{
struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME);
/* initialize and bring everything back */
ioat_resume(ioat_dma);
}
static const struct pci_error_handlers ioat_err_handler = {
.error_detected = ioat_pcie_error_detected,
.slot_reset = ioat_pcie_error_slot_reset,
.resume = ioat_pcie_error_resume,
};
static struct pci_driver ioat_pci_driver = {
.name = DRV_NAME,
.id_table = ioat_pci_tbl,
.probe = ioat_pci_probe,
.remove = ioat_remove,
.shutdown = ioat_shutdown,
.err_handler = &ioat_err_handler,
};
static struct ioatdma_device *
@ -1245,13 +1349,17 @@ static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, device);
device->version = readb(device->reg_base + IOAT_VER_OFFSET);
if (device->version >= IOAT_VER_3_0)
if (device->version >= IOAT_VER_3_0) {
err = ioat3_dma_probe(device, ioat_dca_enabled);
else
if (device->version >= IOAT_VER_3_3)
pci_enable_pcie_error_reporting(pdev);
} else
return -ENODEV;
if (err) {
dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
pci_disable_pcie_error_reporting(pdev);
return -ENODEV;
}
@ -1271,6 +1379,8 @@ static void ioat_remove(struct pci_dev *pdev)
free_dca_provider(device->dca);
device->dca = NULL;
}
pci_disable_pcie_error_reporting(pdev);
ioat_dma_remove(device);
}

34
drivers/dma/ioat/prep.c
View File

@ -121,6 +121,9 @@ ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
size_t total_len = len;
int num_descs, idx, i;
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
num_descs = ioat_xferlen_to_descs(ioat_chan, len);
if (likely(num_descs) &&
ioat_check_space_lock(ioat_chan, num_descs) == 0)
@ -254,6 +257,11 @@ struct dma_async_tx_descriptor *
ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
unsigned int src_cnt, size_t len, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
return __ioat_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags);
}
@ -262,6 +270,11 @@ ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
unsigned int src_cnt, size_t len,
enum sum_check_flags *result, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
/* the cleanup routine only sets bits on validate failure, it
* does not clear bits on validate success... so clear it here
*/
@ -574,6 +587,11 @@ ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
/* specify valid address for disabled result */
if (flags & DMA_PREP_PQ_DISABLE_P)
dst[0] = dst[1];
@ -614,6 +632,11 @@ ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
unsigned int src_cnt, const unsigned char *scf, size_t len,
enum sum_check_flags *pqres, unsigned long flags)
{
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
/* specify valid address for disabled result */
if (flags & DMA_PREP_PQ_DISABLE_P)
pq[0] = pq[1];
@ -638,6 +661,10 @@ ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
{
unsigned char scf[MAX_SCF];
dma_addr_t pq[2];
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
if (src_cnt > MAX_SCF)
return NULL;
@ -661,6 +688,10 @@ ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
{
unsigned char scf[MAX_SCF];
dma_addr_t pq[2];
struct ioatdma_chan *ioat_chan = to_ioat_chan(chan);
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
if (src_cnt > MAX_SCF)
return NULL;
@ -689,6 +720,9 @@ ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags)
struct ioat_ring_ent *desc;
struct ioat_dma_descriptor *hw;
if (test_bit(IOAT_CHAN_DOWN, &ioat_chan->state))
return NULL;
if (ioat_check_space_lock(ioat_chan, 1) == 0)
desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head);
else