From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 02F3E1170E for ; Mon, 21 Aug 2023 19:51:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2BB12C433C7; Mon, 21 Aug 2023 19:51:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1692647479; bh=V5htXI/isMDTyngJmE2r17CXwwBM32OzxOtzxDclOsk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZVmhF0QarrKrgsbkoZIRAMOVff+zljRDl5A1Z66VGmjnycKhzHMDgTVvuJ5eA+nEt BWPfVFmj+1haG9Nd7tvPmhKASQHOYRo26I/Btjk40FCXGRFl+cGx7t7er7mZFODWzi n7qVzCv8jhSIptpzH7+/0B9zge73L0espikOlN+k= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ofir Bitton , Oded Gabbay , Sasha Levin Subject: [PATCH 6.1 028/194] accel/habanalabs: add pci health check during heartbeat Date: Mon, 21 Aug 2023 21:40:07 +0200 Message-ID: <20230821194124.028595855@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230821194122.695845670@linuxfoundation.org> References: <20230821194122.695845670@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ofir Bitton [ Upstream commit d8b9cea584661b30305cf341bf9f675dc0a25471 ] Currently upon a heartbeat failure, we don't know if the failure is due to firmware hang or due to a bad PCI link. Hence, we are reading a PCI config space register with a known value (vendor ID) so we will know which of the two possibilities caused the heartbeat failure. Signed-off-by: Ofir Bitton Reviewed-by: Oded Gabbay Signed-off-by: Oded Gabbay Signed-off-by: Sasha Levin --- drivers/misc/habanalabs/common/device.c | 15 ++++++++++++++- drivers/misc/habanalabs/common/habanalabs.h | 2 ++ drivers/misc/habanalabs/common/habanalabs_drv.c | 2 -- 3 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c index e0dca445abf14..9ee1b6abd8a05 100644 --- a/drivers/misc/habanalabs/common/device.c +++ b/drivers/misc/habanalabs/common/device.c @@ -870,6 +870,18 @@ static void device_early_fini(struct hl_device *hdev) hdev->asic_funcs->early_fini(hdev); } +static bool is_pci_link_healthy(struct hl_device *hdev) +{ + u16 vendor_id; + + if (!hdev->pdev) + return false; + + pci_read_config_word(hdev->pdev, PCI_VENDOR_ID, &vendor_id); + + return (vendor_id == PCI_VENDOR_ID_HABANALABS); +} + static void hl_device_heartbeat(struct work_struct *work) { struct hl_device *hdev = container_of(work, struct hl_device, @@ -882,7 +894,8 @@ static void hl_device_heartbeat(struct work_struct *work) goto reschedule; if (hl_device_operational(hdev, NULL)) - dev_err(hdev->dev, "Device heartbeat failed!\n"); + dev_err(hdev->dev, "Device heartbeat failed! PCI link is %s\n", + is_pci_link_healthy(hdev) ? "healthy" : "broken"); hl_device_reset(hdev, HL_DRV_RESET_HARD | HL_DRV_RESET_HEARTBEAT); diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h index 58c95b13be69a..257b94cec6248 100644 --- a/drivers/misc/habanalabs/common/habanalabs.h +++ b/drivers/misc/habanalabs/common/habanalabs.h @@ -34,6 +34,8 @@ struct hl_device; struct hl_fpriv; +#define PCI_VENDOR_ID_HABANALABS 0x1da3 + /* Use upper bits of mmap offset to store habana driver specific information. * bits[63:59] - Encode mmap type * bits[45:0] - mmap offset value diff --git a/drivers/misc/habanalabs/common/habanalabs_drv.c b/drivers/misc/habanalabs/common/habanalabs_drv.c index 112632afe7d53..ae3cab3f4aa55 100644 --- a/drivers/misc/habanalabs/common/habanalabs_drv.c +++ b/drivers/misc/habanalabs/common/habanalabs_drv.c @@ -54,8 +54,6 @@ module_param(boot_error_status_mask, ulong, 0444); MODULE_PARM_DESC(boot_error_status_mask, "Mask of the error status during device CPU boot (If bitX is cleared then error X is masked. Default all 1's)"); -#define PCI_VENDOR_ID_HABANALABS 0x1da3 - #define PCI_IDS_GOYA 0x0001 #define PCI_IDS_GAUDI 0x1000 #define PCI_IDS_GAUDI_SEC 0x1010 -- 2.40.1