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Mon, 27 Nov 2017 06:20:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1511763637; bh=hKqZVx8hw23hCIuxUdZmn+S5ObxkQjbYYPjURapsG28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RQ1i+/ACthvoJBR+/cAQC2yxajIo3S7nd49/efboOP8aN+FJ0wM2EVhLn0hZwtRLd gZcWV4H6vtuAEetpd7liLsDDSEojXaLs4i9VGnRdrxsjUODNXZbzBkIfiIcSWHlQBQ cq8DUM36hTAs0fJBAjl/j6fGDyzb3cAsjW4fXx9U= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 16A1169B22 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=okaya@codeaurora.org From: Sinan Kaya To: linux-pci@vger.kernel.org, timur@codeaurora.org Subject: [PATCH V2 2/7] PCI: handle FLR failure and allow other reset types Date: Mon, 27 Nov 2017 01:20:23 -0500 Message-Id: <1511763628-11856-3-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1511763628-11856-1-git-send-email-okaya@codeaurora.org> References: <1511763628-11856-1-git-send-email-okaya@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171126_222058_767471_B4022219 X-CRM114-Status: GOOD ( 13.35 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sinan Kaya , linux-arm-msm@vger.kernel.org, Bjorn Helgaas , open list , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP pci_flr_wait() and pci_af_flr() functions assume graceful return even though the device is inaccessible under error conditions. Return -ENOTTY in error cases so that __pci_reset_function_locked() can try other reset types if AF_FLR/FLR reset fails. Signed-off-by: Sinan Kaya Reviewed-by: Christoph Hellwig --- drivers/pci/pci.c | 18 ++++++++++-------- include/linux/pci.h | 2 +- 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 23681f4..27ec45d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3820,7 +3820,7 @@ int pci_wait_for_pending_transaction(struct pci_dev *dev) } EXPORT_SYMBOL(pci_wait_for_pending_transaction); -static void pci_flr_wait(struct pci_dev *dev) +static int pci_flr_wait(struct pci_dev *dev) { int delay = 1, timeout = 60000; u32 id; @@ -3849,7 +3849,7 @@ static void pci_flr_wait(struct pci_dev *dev) if (delay > timeout) { dev_warn(&dev->dev, "not ready %dms after FLR; giving up\n", 100 + delay - 1); - return; + return -ENOTTY; } if (delay > 1000) @@ -3863,6 +3863,8 @@ static void pci_flr_wait(struct pci_dev *dev) if (delay > 1000) dev_info(&dev->dev, "ready %dms after FLR\n", 100 + delay - 1); + + return 0; } /** @@ -3891,13 +3893,13 @@ static bool pcie_has_flr(struct pci_dev *dev) * device supports FLR before calling this function, e.g. by using the * pcie_has_flr() helper. */ -void pcie_flr(struct pci_dev *dev) +int pcie_flr(struct pci_dev *dev) { if (!pci_wait_for_pending_transaction(dev)) dev_err(&dev->dev, "timed out waiting for pending transaction; performing function level reset anyway\n"); pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); - pci_flr_wait(dev); + return pci_flr_wait(dev); } EXPORT_SYMBOL_GPL(pcie_flr); @@ -3930,8 +3932,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe) dev_err(&dev->dev, "timed out waiting for pending transaction; performing AF function level reset anyway\n"); pci_write_config_byte(dev, pos + PCI_AF_CTRL, PCI_AF_CTRL_FLR); - pci_flr_wait(dev); - return 0; + return pci_flr_wait(dev); } /** @@ -4203,8 +4204,9 @@ int __pci_reset_function_locked(struct pci_dev *dev) if (rc != -ENOTTY) return rc; if (pcie_has_flr(dev)) { - pcie_flr(dev); - return 0; + rc = pcie_flr(dev); + if (rc != -ENOTTY) + return rc; } rc = pci_af_flr(dev, 0); if (rc != -ENOTTY) diff --git a/include/linux/pci.h b/include/linux/pci.h index d16a7c0..354b018 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1089,7 +1089,7 @@ static inline int pci_is_managed(struct pci_dev *pdev) int pcie_set_mps(struct pci_dev *dev, int mps); int pcie_get_minimum_link(struct pci_dev *dev, enum pci_bus_speed *speed, enum pcie_link_width *width); -void pcie_flr(struct pci_dev *dev); +int pcie_flr(struct pci_dev *dev); int __pci_reset_function(struct pci_dev *dev); int __pci_reset_function_locked(struct pci_dev *dev); int pci_reset_function(struct pci_dev *dev);