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bnxt_en: Re-write PCI BARs after PCI fatal error.

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[ Upstream commit f75d9a0aa9 ]

When a PCIe fatal error occurs, the internal latched BAR addresses
in the chip get reset even though the BAR register values in config
space are retained.

pci_restore_state() will not rewrite the BAR addresses if the
BAR address values are valid, causing the chip's internal BAR addresses
to stay invalid.  So we need to zero the BAR registers during PCIe fatal
error to force pci_restore_state() to restore the BAR addresses.  These
write cycles to the BAR registers will cause the proper BAR addresses to
latch internally.

Fixes: 6316ea6db9 ("bnxt_en: Enable AER support.")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vasundhara Volam
2020-10-26 00:18:19 -04:00
committed by Greg Kroah-Hartman
parent 5c86cda6a5
commit aa4dba4e22
2 changed files with 19 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/ethernet/broadcom/bnxt/bnxt.c
View File

@@ -12049,6 +12049,9 @@ static pci_ers_result_t bnxt_io_error_detected(struct pci_dev *pdev,
return PCI_ERS_RESULT_DISCONNECT;
}
if (state == pci_channel_io_frozen)
set_bit(BNXT_STATE_PCI_CHANNEL_IO_FROZEN, &bp->state);
if (netif_running(netdev))
bnxt_close(netdev);
@@ -12072,7 +12075,7 @@ static pci_ers_result_t bnxt_io_slot_reset(struct pci_dev *pdev)
{
struct net_device *netdev = pci_get_drvdata(pdev);
struct bnxt *bp = netdev_priv(netdev);
int err = 0;
int err = 0, off;
pci_ers_result_t result = PCI_ERS_RESULT_DISCONNECT;
netdev_info(bp->dev, "PCI Slot Reset\n");
@@ -12084,6 +12087,20 @@ static pci_ers_result_t bnxt_io_slot_reset(struct pci_dev *pdev)
"Cannot re-enable PCI device after reset.\n");
} else {
pci_set_master(pdev);
/* Upon fatal error, our device internal logic that latches to
* BAR value is getting reset and will restore only upon
* rewritting the BARs.
*
* As pci_restore_state() does not re-write the BARs if the
* value is same as saved value earlier, driver needs to
* write the BARs to 0 to force restore, in case of fatal error.
*/
if (test_and_clear_bit(BNXT_STATE_PCI_CHANNEL_IO_FROZEN,
&bp->state)) {
for (off = PCI_BASE_ADDRESS_0;
off <= PCI_BASE_ADDRESS_5; off += 4)
pci_write_config_dword(bp->pdev, off, 0);
}
pci_restore_state(pdev);
pci_save_state(pdev);

1
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@@ -1627,6 +1627,7 @@ struct bnxt {
#define BNXT_STATE_IN_FW_RESET 4
#define BNXT_STATE_ABORT_ERR 5
#define BNXT_STATE_FW_FATAL_COND 6
#define BNXT_STATE_PCI_CHANNEL_IO_FROZEN 8
#define BNXT_NO_FW_ACCESS(bp) \
(test_bit(BNXT_STATE_FW_FATAL_COND, &(bp)->state) || \