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From: Amey Narkhede <ameynarkhede03@gmail.com>
To: Bjorn Helgaas <bhelgaas@google.com>
Cc: alex.williamson@redhat.com,
	Raphael Norwitz <raphael.norwitz@nutanix.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	kw@linux.com, Shanker Donthineni <sdonthineni@nvidia.com>,
	Sinan Kaya <okaya@kernel.org>, Len Brown <lenb@kernel.org>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Amey Narkhede <ameynarkhede03@gmail.com>
Subject: [PATCH v14 2/9] PCI: Add pcie_reset_flr to follow calling convention of other reset methods
Date: Thu,  5 Aug 2021 02:11:54 +0530	[thread overview]
Message-ID: <20210804204201.1282-3-ameynarkhede03@gmail.com> (raw)
In-Reply-To: <20210804204201.1282-1-ameynarkhede03@gmail.com>

Currently there is separate function pcie_has_flr() to probe if PCIe FLR
is supported by the device which does not match the calling convention
followed by reset methods which use second function argument to decide
whether to probe or not. Add new function pcie_reset_flr() that follows
the calling convention of reset methods.

Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 drivers/crypto/cavium/nitrox/nitrox_main.c |  4 +--
 drivers/pci/pci.c                          | 40 +++++++++++++++-------
 drivers/pci/pcie/aer.c                     | 12 +++----
 drivers/pci/quirks.c                       |  9 ++---
 include/linux/pci.h                        |  2 +-
 5 files changed, 38 insertions(+), 29 deletions(-)

diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c
index facc8e6bc580..15d6c8452807 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_main.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_main.c
@@ -306,9 +306,7 @@ static int nitrox_device_flr(struct pci_dev *pdev)
 		return -ENOMEM;
 	}
 
-	/* check flr support */
-	if (pcie_has_flr(pdev))
-		pcie_flr(pdev);
+	pcie_reset_flr(pdev, 0);
 
 	pci_restore_state(pdev);
 
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 1fafd05caa41..7d1d9671160b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4619,22 +4619,20 @@ EXPORT_SYMBOL(pci_wait_for_pending_transaction);
  * Returns true if the device advertises support for PCIe function level
  * resets.
  */
-bool pcie_has_flr(struct pci_dev *dev)
+static bool pcie_has_flr(struct pci_dev *dev)
 {
 	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
 		return false;
 
 	return FIELD_GET(PCI_EXP_DEVCAP_FLR, dev->devcap) == 1;
 }
-EXPORT_SYMBOL_GPL(pcie_has_flr);
 
 /**
  * pcie_flr - initiate a PCIe function level reset
  * @dev: device to reset
  *
- * Initiate a function level reset on @dev.  The caller should ensure the
- * device supports FLR before calling this function, e.g. by using the
- * pcie_has_flr() helper.
+ * Initiate a function level reset unconditionally on @dev without
+ * checking any flags and DEVCAP
  */
 int pcie_flr(struct pci_dev *dev)
 {
@@ -4657,6 +4655,25 @@ int pcie_flr(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pcie_flr);
 
+/**
+ * pcie_reset_flr - initiate a PCIe function level reset
+ * @dev: device to reset
+ * @probe: If set, only check if the device can be reset this way.
+ *
+ * Initiate a function level reset on @dev.
+ */
+int pcie_reset_flr(struct pci_dev *dev, int probe)
+{
+	if (!pcie_has_flr(dev))
+		return -ENOTTY;
+
+	if (probe)
+		return 0;
+
+	return pcie_flr(dev);
+}
+EXPORT_SYMBOL_GPL(pcie_reset_flr);
+
 static int pci_af_flr(struct pci_dev *dev, int probe)
 {
 	int pos;
@@ -5137,11 +5154,9 @@ int __pci_reset_function_locked(struct pci_dev *dev)
 	rc = pci_dev_specific_reset(dev, 0);
 	if (rc != -ENOTTY)
 		return rc;
-	if (pcie_has_flr(dev)) {
-		rc = pcie_flr(dev);
-		if (rc != -ENOTTY)
-			return rc;
-	}
+	rc = pcie_reset_flr(dev, 0);
+	if (rc != -ENOTTY)
+		return rc;
 	rc = pci_af_flr(dev, 0);
 	if (rc != -ENOTTY)
 		return rc;
@@ -5172,8 +5187,9 @@ int pci_probe_reset_function(struct pci_dev *dev)
 	rc = pci_dev_specific_reset(dev, 1);
 	if (rc != -ENOTTY)
 		return rc;
-	if (pcie_has_flr(dev))
-		return 0;
+	rc = pcie_reset_flr(dev, 1);
+	if (rc != -ENOTTY)
+		return rc;
 	rc = pci_af_flr(dev, 1);
 	if (rc != -ENOTTY)
 		return rc;
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index ec943cee5ecc..98077595a73e 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1405,13 +1405,11 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 	}
 
 	if (type == PCI_EXP_TYPE_RC_EC || type == PCI_EXP_TYPE_RC_END) {
-		if (pcie_has_flr(dev)) {
-			rc = pcie_flr(dev);
-			pci_info(dev, "has been reset (%d)\n", rc);
-		} else {
-			pci_info(dev, "not reset (no FLR support)\n");
-			rc = -ENOTTY;
-		}
+		rc = pcie_reset_flr(dev, 0);
+		if (!rc)
+			pci_info(dev, "has been reset\n");
+		else
+			pci_info(dev, "not reset (no FLR support: %d)\n", rc);
 	} else {
 		rc = pci_bus_error_reset(dev);
 		pci_info(dev, "%s Port link has been reset (%d)\n",
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index d85914afe65a..b48e7ef8b641 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3819,7 +3819,7 @@ static int nvme_disable_and_flr(struct pci_dev *dev, int probe)
 	u32 cfg;
 
 	if (dev->class != PCI_CLASS_STORAGE_EXPRESS ||
-	    !pcie_has_flr(dev) || !pci_resource_start(dev, 0))
+	    pcie_reset_flr(dev, 1) || !pci_resource_start(dev, 0))
 		return -ENOTTY;
 
 	if (probe)
@@ -3888,13 +3888,10 @@ static int nvme_disable_and_flr(struct pci_dev *dev, int probe)
  */
 static int delay_250ms_after_flr(struct pci_dev *dev, int probe)
 {
-	if (!pcie_has_flr(dev))
-		return -ENOTTY;
-
 	if (probe)
-		return 0;
+		return pcie_reset_flr(dev, 1);
 
-	pcie_flr(dev);
+	pcie_reset_flr(dev, 0);
 
 	msleep(250);
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 697b1f085c7b..aa85e7d3147e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1226,7 +1226,7 @@ u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
 			     enum pci_bus_speed *speed,
 			     enum pcie_link_width *width);
 void pcie_print_link_status(struct pci_dev *dev);
-bool pcie_has_flr(struct pci_dev *dev);
+int pcie_reset_flr(struct pci_dev *dev, int probe);
 int pcie_flr(struct pci_dev *dev);
 int __pci_reset_function_locked(struct pci_dev *dev);
 int pci_reset_function(struct pci_dev *dev);
-- 
2.32.0


  parent reply	other threads:[~2021-08-04 20:42 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04 20:41 [PATCH v14 0/9] PCI: Expose and manage PCI device reset Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 1/9] PCI: Cache PCIe FLR capability Amey Narkhede
2021-08-04 20:41 ` Amey Narkhede [this message]
2021-08-04 20:41 ` [PATCH v14 3/9] PCI: Add new array for keeping track of ordering of reset methods Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 4/9] PCI: Remove reset_fn field from pci_dev Amey Narkhede
2021-08-04 20:41 ` [PATCH v14 5/9] PCI: Allow userspace to query and set device reset mechanism Amey Narkhede
2021-08-05  3:55   ` Shanker R Donthineni
2021-08-04 20:41 ` [PATCH v14 6/9] PCI: Define a function to set ACPI_COMPANION in pci_dev Amey Narkhede
2021-08-05  3:19   ` Shanker R Donthineni
2021-08-04 20:41 ` [PATCH v14 7/9] PCI: Setup ACPI fwnode early and at the same time with OF Amey Narkhede
2021-08-04 20:42 ` [PATCH v14 8/9] PCI: Add support for ACPI _RST reset method Amey Narkhede
2021-08-04 20:42 ` [PATCH v14 9/9] PCI: Change the type of probe argument in reset functions Amey Narkhede

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