From: Vasundhara Volam vasundhara-v.volam@broadcom.com
[ Upstream commit f75d9a0aa96721d20011cd5f8c7a24eb32728589 ]
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: 6316ea6db93d ("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 --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 19 ++++++++++++++++++- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 + 2 files changed, 19 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -12233,6 +12233,9 @@ static pci_ers_result_t bnxt_io_error_de 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);
@@ -12259,7 +12262,7 @@ static pci_ers_result_t bnxt_io_slot_res { 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"); @@ -12271,6 +12274,20 @@ static pci_ers_result_t bnxt_io_slot_res "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);
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -1672,6 +1672,7 @@ struct bnxt { #define BNXT_STATE_ABORT_ERR 5 #define BNXT_STATE_FW_FATAL_COND 6 #define BNXT_STATE_DRV_REGISTERED 7 +#define BNXT_STATE_PCI_CHANNEL_IO_FROZEN 8
#define BNXT_NO_FW_ACCESS(bp) \ (test_bit(BNXT_STATE_FW_FATAL_COND, &(bp)->state) || \