[PATCH AUTOSEL 6.7 061/108] ionic: pass opcode to devcmd_wait

Sasha Levin
2024-01-16T19:45:11Z

From: Shannon Nelson <shannon.nelson@amd.com>

[ Upstream commit 24f110240c03c6b5368f1203bac72883d511e606 ]

Don't rely on the PCI memory for the devcmd opcode because we
read a 0xff value if the PCI bus is broken, which can cause us
to report a bogus dev_cmd opcode later.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/pensando/ionic/ionic_dev.c | 1 +
drivers/net/ethernet/pensando/ionic/ionic_dev.h | 1 +
drivers/net/ethernet/pensando/ionic/ionic_main.c | 2 +-
3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
index c06576f43916..22ab0a44fa8c 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -321,6 +321,7 @@ void ionic_dev_cmd_comp(struct ionic_dev *idev, union ionic_dev_cmd_comp *comp)

void ionic_dev_cmd_go(struct ionic_dev *idev, union ionic_dev_cmd *cmd)
{
+ idev->opcode = cmd->cmd.opcode;
memcpy_toio(&idev->dev_cmd_regs->cmd, cmd, sizeof(*cmd));
iowrite32(0, &idev->dev_cmd_regs->done);
iowrite32(1, &idev->dev_cmd_regs->doorbell);
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.h b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
index 9b5463040075..fd112bee4dcf 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -153,6 +153,7 @@ struct ionic_dev {
bool fw_hb_ready;
bool fw_status_ready;
u8 fw_generation;
+ u8 opcode;

u64 __iomem *db_pages;
dma_addr_t phy_db_pages;
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
index 835577392178..1b547acfd8e9 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
@@ -465,7 +465,7 @@ static int __ionic_dev_cmd_wait(struct ionic *ionic, unsigned long max_seconds,
*/
max_wait = jiffies + (max_seconds * HZ);
try_again:
- opcode = readb(&idev->dev_cmd_regs->cmd.cmd.opcode);
+ opcode = idev->opcode;
start_time = jiffies;
for (fw_up = ionic_is_fw_running(idev);
!done && fw_up && time_before(jiffies, max_wait);
--
2.43.0