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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Shannon Nelson <shannon.nelson@amd.com>,
	Brett Creeley <brett.creeley@amd.com>,
	"David S . Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>,
	drivers@pensando.io,
	edumazet@google.com,
	kuba@kernel.org,
	pabeni@redhat.com,
	florian.fainelli@broadcom.com,
	allen.hubbe@amd.com,
	drc@linux.vnet.ibm.com,
	yuehaibing@huawei.com,
	leon@kernel.org,
	justinstitt@google.com,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 6.6 060/104] ionic: pass opcode to devcmd_wait
Date: Tue, 16 Jan 2024 14:46:26 -0500
Message-ID: <20240116194908.253437-60-sashal@kernel.org>
In-Reply-To: <20240116194908.253437-1-sashal@kernel.org>
References: <20240116194908.253437-1-sashal@kernel.org>
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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 bd2d4a26f543..23f9d3b8029a 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_dev.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.h
@@ -152,6 +152,7 @@ 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 1dc79cecc5cc..baa865af49ad 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