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* [PATCH v6 0/8] Expose and manage PCI device reset
@ 2021-06-07 18:21 Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 1/8] PCI: Add pcie_reset_flr to follow calling convention of other reset methods Amey Narkhede
                   ` (7 more replies)
  0 siblings, 8 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya, Amey Narkhede

PCI and PCIe devices may support a number of possible reset mechanisms
for example Function Level Reset (FLR) provided via Advanced Feature or
PCIe capabilities, Power Management reset, bus reset, or device specific reset.
Currently the PCI subsystem creates a policy prioritizing these reset methods
which provides neither visibility nor control to userspace.

Expose the reset methods available per device to userspace, via sysfs
and allow an administrative user or device owner to have ability to
manage per device reset method priorities or exclusions.
This feature aims to allow greater control of a device for use cases
as device assignment, where specific device or platform issues may
interact poorly with a given reset method, and for which device specific
quirks have not been developed.

Changes in v6:
	- Address Bjorn's and Krzysztof's review comments
	- Add Shanker's updated patches along with new
	  "PCI: Setup ACPI_COMPANION early" patch

Changes in v5:
	- Rebase the series over pci/reset branch of
	  Bjorn's pci tree to avoid merge conflicts
	  caused by recent changes in existing reset
	  sysfs attribute

Changes in v4:
	- Change the order or strlen and strim in reset_method_store
	  function to avoid extra strlen call.
	- Use consistent terminology in new
	  pci_reset_mode enum and rename the probe argument
	  of reset functions.

Changes in v3:
	- Dropped "PCI: merge slot and bus reset implementations" which was
	  already accepted separately
	- Grammar fixes
	- Added Shanker's patches which were rebased on v2 of this series
	- Added "PCI: Change the type of probe argument in reset functions"
	  and additional user input sanitization code in reset_method_store
	  function per review feedback from Krzysztof

Changes in v2:
	- Use byte array instead of bitmap to keep track of
	  ordering of reset methods
	- Fix incorrect use of reset_fn field in octeon driver
	- Allow writing comma separated list of names of supported reset
	  methods to reset_method sysfs attribute
	- Writing empty string instead of "none" to reset_method attribute
	  disables ability of reset the device

Amey Narkhede (5):
  PCI: Add pcie_reset_flr to follow calling convention of other reset
    methods
  PCI: Add new array for keeping track of ordering of reset methods
  PCI: Remove reset_fn field from pci_dev
  PCI/sysfs: Allow userspace to query and set device reset mechanism
  PCI: Change the type of probe argument in reset functions

Shanker Donthineni (3):
  PCI: Setup ACPI_COMPANION early
  PCI: Add support for ACPI _RST reset method
  PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs

 Documentation/ABI/testing/sysfs-bus-pci       |  16 ++
 drivers/crypto/cavium/nitrox/nitrox_main.c    |   4 +-
 .../ethernet/cavium/liquidio/lio_vf_main.c    |   2 +-
 drivers/pci/hotplug/pciehp.h                  |   2 +-
 drivers/pci/hotplug/pciehp_hpc.c              |   4 +-
 drivers/pci/pci-acpi.c                        |  39 ++-
 drivers/pci/pci-sysfs.c                       | 120 ++++++++-
 drivers/pci/pci.c                             | 238 +++++++++++-------
 drivers/pci/pci.h                             |  22 +-
 drivers/pci/pcie/aer.c                        |  12 +-
 drivers/pci/probe.c                           |   6 +-
 drivers/pci/quirks.c                          |  54 ++--
 drivers/pci/remove.c                          |   1 -
 include/linux/pci.h                           |  16 +-
 include/linux/pci_hotplug.h                   |   2 +-
 15 files changed, 393 insertions(+), 145 deletions(-)

--
2.31.1

^ permalink raw reply	[flat|nested] 12+ messages in thread
* [PATCH v6 1/8] PCI: Add pcie_reset_flr to follow calling convention of other reset methods
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 2/8] PCI: Add new array for keeping track of ordering of " Amey Narkhede
                   ` (6 subsequent siblings)
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya, Amey Narkhede

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.

Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 drivers/crypto/cavium/nitrox/nitrox_main.c |  4 +-
 drivers/pci/pci.c                          | 62 ++++++++++++----------
 drivers/pci/pcie/aer.c                     | 12 ++---
 drivers/pci/quirks.c                       |  9 ++--
 include/linux/pci.h                        |  2 +-
 5 files changed, 43 insertions(+), 46 deletions(-)

diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c
index facc8e6bc..15d6c8452 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 452351025..3bf36924c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4611,32 +4611,12 @@ int pci_wait_for_pending_transaction(struct pci_dev *dev)
 }
 EXPORT_SYMBOL(pci_wait_for_pending_transaction);
 
-/**
- * pcie_has_flr - check if a device supports function level resets
- * @dev: device to check
- *
- * Returns true if the device advertises support for PCIe function level
- * resets.
- */
-bool pcie_has_flr(struct pci_dev *dev)
-{
-	u32 cap;
-
-	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
-		return false;
-
-	pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
-	return cap & PCI_EXP_DEVCAP_FLR;
-}
-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)
 {
@@ -4659,6 +4639,31 @@ 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)
+{
+	u32 cap;
+
+	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
+		return -ENOTTY;
+
+	pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
+	if (!(cap & PCI_EXP_DEVCAP_FLR))
+		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;
@@ -5139,11 +5144,9 @@ 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;
@@ -5174,8 +5177,9 @@ 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 ec943cee5..98077595a 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 d85914afe..f977ba79a 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;
+	int ret = pcie_reset_flr(dev, probe);
 
 	if (probe)
-		return 0;
-
-	pcie_flr(dev);
+		return ret;
 
 	msleep(250);
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index c20211e59..20b90c205 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1225,7 +1225,7 @@ 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);
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 2/8] PCI: Add new array for keeping track of ordering of reset methods
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 1/8] PCI: Add pcie_reset_flr to follow calling convention of other reset methods Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 3/8] PCI: Remove reset_fn field from pci_dev Amey Narkhede
                   ` (5 subsequent siblings)
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya, Amey Narkhede

Introduce a new array reset_methods in struct pci_dev to keep track of
reset mechanisms supported by the device and their ordering.
Also refactor probing and reset functions to take advantage of calling
convention of reset functions.

Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 drivers/pci/pci.c   | 108 ++++++++++++++++++++++++++------------------
 drivers/pci/pci.h   |   8 +++-
 drivers/pci/probe.c |   5 +-
 include/linux/pci.h |   7 +++
 4 files changed, 81 insertions(+), 47 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 3bf36924c..39a9ea8bb 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -72,6 +72,14 @@ static void pci_dev_d3_sleep(struct pci_dev *dev)
 		msleep(delay);
 }
 
+bool pci_reset_supported(struct pci_dev *dev)
+{
+	u8 null_reset_methods[PCI_RESET_METHODS_NUM] = { 0 };
+
+	return memcmp(null_reset_methods,
+		      dev->reset_methods, PCI_RESET_METHODS_NUM);
+}
+
 #ifdef CONFIG_PCI_DOMAINS
 int pci_domains_supported = 1;
 #endif
@@ -5107,6 +5115,18 @@ static void pci_dev_restore(struct pci_dev *dev)
 		err_handler->reset_done(dev);
 }
 
+/*
+ * The ordering for functions in pci_reset_fn_methods is required for
+ * reset_methods byte array defined in struct pci_dev.
+ */
+const struct pci_reset_fn_method pci_reset_fn_methods[] = {
+	{ &pci_dev_specific_reset, .name = "device_specific" },
+	{ &pcie_reset_flr, .name = "flr" },
+	{ &pci_af_flr, .name = "af_flr" },
+	{ &pci_pm_reset, .name = "pm" },
+	{ &pci_reset_bus_function, .name = "bus" },
+};
+
 /**
  * __pci_reset_function_locked - reset a PCI device function while holding
  * the @dev mutex lock.
@@ -5129,65 +5149,67 @@ static void pci_dev_restore(struct pci_dev *dev)
  */
 int __pci_reset_function_locked(struct pci_dev *dev)
 {
-	int rc;
+	int i, rc = -ENOTTY;
+	u8 prio;
 
 	might_sleep();
 
-	/*
-	 * A reset method returns -ENOTTY if it doesn't support this device
-	 * and we should try the next method.
-	 *
-	 * If it returns 0 (success), we're finished.  If it returns any
-	 * other error, we're also finished: this indicates that further
-	 * reset mechanisms might be broken on the device.
-	 */
-	rc = pci_dev_specific_reset(dev, 0);
-	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;
-	rc = pci_pm_reset(dev, 0);
-	if (rc != -ENOTTY)
-		return rc;
-	return pci_reset_bus_function(dev, 0);
+	for (prio = PCI_RESET_METHODS_NUM; prio; prio--) {
+		for (i = 0; i < PCI_RESET_METHODS_NUM; i++) {
+			if (dev->reset_methods[i] == prio) {
+				/*
+				 * A reset method returns -ENOTTY if it doesn't
+				 * support this device and we should try the
+				 * next method.
+				 *
+				 * If it returns 0 (success), we're finished.
+				 * If it returns any other error, we're also
+				 * finished: this indicates that further reset
+				 * mechanisms might be broken on the device.
+				 */
+				rc = pci_reset_fn_methods[i].reset_fn(dev, 0);
+				if (rc != -ENOTTY)
+					return rc;
+				break;
+			}
+		}
+		if (i == PCI_RESET_METHODS_NUM)
+			break;
+	}
+	return rc;
 }
 EXPORT_SYMBOL_GPL(__pci_reset_function_locked);
 
 /**
- * pci_probe_reset_function - check whether the device can be safely reset
- * @dev: PCI device to reset
+ * pci_init_reset_methods - check whether device can be safely reset
+ * and store supported reset mechanisms.
+ * @dev: PCI device to check for reset mechanisms
  *
  * Some devices allow an individual function to be reset without affecting
  * other functions in the same device.  The PCI device must be responsive
- * to PCI config space in order to use this function.
+ * to reads and writes to its PCI config space in order to use this function.
  *
- * Returns 0 if the device function can be reset or negative if the
- * device doesn't support resetting a single function.
+ * Stores reset mechanisms supported by device in reset_methods byte array
+ * which is a member of struct pci_dev.
  */
-int pci_probe_reset_function(struct pci_dev *dev)
+void pci_init_reset_methods(struct pci_dev *dev)
 {
-	int rc;
+	int i, rc;
+	u8 prio = PCI_RESET_METHODS_NUM;
+	u8 reset_methods[PCI_RESET_METHODS_NUM] = { 0 };
 
-	might_sleep();
+	BUILD_BUG_ON(ARRAY_SIZE(pci_reset_fn_methods) != PCI_RESET_METHODS_NUM);
 
-	rc = pci_dev_specific_reset(dev, 1);
-	if (rc != -ENOTTY)
-		return rc;
-	rc = pcie_reset_flr(dev, 1);
-	if (rc != -ENOTTY)
-		return rc;
-	rc = pci_af_flr(dev, 1);
-	if (rc != -ENOTTY)
-		return rc;
-	rc = pci_pm_reset(dev, 1);
-	if (rc != -ENOTTY)
-		return rc;
+	might_sleep();
 
-	return pci_reset_bus_function(dev, 1);
+	for (i = 0; i < PCI_RESET_METHODS_NUM; i++) {
+		rc = pci_reset_fn_methods[i].reset_fn(dev, 1);
+		if (!rc)
+			reset_methods[i] = prio--;
+		else if (rc != -ENOTTY)
+			break;
+	}
+	memcpy(dev->reset_methods, reset_methods, sizeof(reset_methods));
 }
 
 /**
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 37c913bbc..13ec6bd6f 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -33,7 +33,7 @@ enum pci_mmap_api {
 int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vmai,
 		  enum pci_mmap_api mmap_api);
 
-int pci_probe_reset_function(struct pci_dev *dev);
+void pci_init_reset_methods(struct pci_dev *dev);
 int pci_bridge_secondary_bus_reset(struct pci_dev *dev);
 int pci_bus_error_reset(struct pci_dev *dev);
 
@@ -606,6 +606,12 @@ struct pci_dev_reset_methods {
 	int (*reset)(struct pci_dev *dev, int probe);
 };
 
+struct pci_reset_fn_method {
+	int (*reset_fn)(struct pci_dev *pdev, int probe);
+	char *name;
+};
+
+extern const struct pci_reset_fn_method pci_reset_fn_methods[];
 #ifdef CONFIG_PCI_QUIRKS
 int pci_dev_specific_reset(struct pci_dev *dev, int probe);
 #else
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3a62d09b8..8cf532681 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2404,9 +2404,8 @@ static void pci_init_capabilities(struct pci_dev *dev)
 	pci_rcec_init(dev);		/* Root Complex Event Collector */
 
 	pcie_report_downtraining(dev);
-
-	if (pci_probe_reset_function(dev) == 0)
-		dev->reset_fn = 1;
+	pci_init_reset_methods(dev);
+	dev->reset_fn = pci_reset_supported(dev);
 }
 
 /*
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 20b90c205..0955246f8 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -49,6 +49,8 @@
 			       PCI_STATUS_SIG_TARGET_ABORT | \
 			       PCI_STATUS_PARITY)
 
+#define PCI_RESET_METHODS_NUM 5
+
 /*
  * The PCI interface treats multi-function devices as independent
  * devices.  The slot/function address of each device is encoded
@@ -505,6 +507,10 @@ struct pci_dev {
 	char		*driver_override; /* Driver name to force a match */
 
 	unsigned long	priv_flags;	/* Private flags for the PCI driver */
+	/*
+	 * See pci_reset_fn_methods array in pci.c for ordering.
+	 */
+	u8 reset_methods[PCI_RESET_METHODS_NUM];	/* Reset methods ordered by priority */
 };
 
 static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
@@ -1227,6 +1233,7 @@ u32 pcie_bandwidth_available(struct pci_dev *dev, struct pci_dev **limiting_dev,
 void pcie_print_link_status(struct pci_dev *dev);
 int pcie_reset_flr(struct pci_dev *dev, int probe);
 int pcie_flr(struct pci_dev *dev);
+bool pci_reset_supported(struct pci_dev *dev);
 int __pci_reset_function_locked(struct pci_dev *dev);
 int pci_reset_function(struct pci_dev *dev);
 int pci_reset_function_locked(struct pci_dev *dev);
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 3/8] PCI: Remove reset_fn field from pci_dev
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 1/8] PCI: Add pcie_reset_flr to follow calling convention of other reset methods Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 2/8] PCI: Add new array for keeping track of ordering of " Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 4/8] PCI/sysfs: Allow userspace to query and set device reset mechanism Amey Narkhede
                   ` (4 subsequent siblings)
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya, Amey Narkhede

reset_fn field is used to indicate whether the device supports any reset
mechanism or not. Remove the use of reset_fn in favor of new reset_methods
array which can be used to keep track of all supported reset mechanisms of
a device and their ordering.

The octeon driver is incorrectly using
reset_fn field to detect if the device supports FLR or not. Use
pcie_reset_flr() to probe whether it supports FLR or not.

Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 drivers/net/ethernet/cavium/liquidio/lio_vf_main.c | 2 +-
 drivers/pci/pci-sysfs.c                            | 2 +-
 drivers/pci/pci.c                                  | 6 +++---
 drivers/pci/probe.c                                | 1 -
 drivers/pci/quirks.c                               | 2 +-
 drivers/pci/remove.c                               | 1 -
 include/linux/pci.h                                | 1 -
 7 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index 516f166ce..336d149ee 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -526,7 +526,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 			oct->irq_name_storage = NULL;
 		}
 		/* Soft reset the octeon device before exiting */
-		if (oct->pci_dev->reset_fn)
+		if (!pcie_reset_flr(oct->pci_dev, 1))
 			octeon_pci_flr(oct);
 		else
 			cn23xx_vf_ask_pf_to_do_flr(oct);
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index beb8d1f4f..316f70c3e 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1367,7 +1367,7 @@ static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
 {
 	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
 
-	if (!pdev->reset_fn)
+	if (!pci_reset_supported(pdev))
 		return 0;
 
 	return a->mode;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 39a9ea8bb..2302aa421 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5232,7 +5232,7 @@ int pci_reset_function(struct pci_dev *dev)
 {
 	int rc;
 
-	if (!dev->reset_fn)
+	if (!pci_reset_supported(dev))
 		return -ENOTTY;
 
 	pci_dev_lock(dev);
@@ -5268,7 +5268,7 @@ int pci_reset_function_locked(struct pci_dev *dev)
 {
 	int rc;
 
-	if (!dev->reset_fn)
+	if (!pci_reset_supported(dev))
 		return -ENOTTY;
 
 	pci_dev_save_and_disable(dev);
@@ -5291,7 +5291,7 @@ int pci_try_reset_function(struct pci_dev *dev)
 {
 	int rc;
 
-	if (!dev->reset_fn)
+	if (!pci_reset_supported(dev))
 		return -ENOTTY;
 
 	if (!pci_dev_trylock(dev))
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8cf532681..90fd4f61f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2405,7 +2405,6 @@ static void pci_init_capabilities(struct pci_dev *dev)
 
 	pcie_report_downtraining(dev);
 	pci_init_reset_methods(dev);
-	dev->reset_fn = pci_reset_supported(dev);
 }
 
 /*
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index f977ba79a..e86cf4a3b 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5589,7 +5589,7 @@ static void quirk_reset_lenovo_thinkpad_p50_nvgpu(struct pci_dev *pdev)
 
 	if (pdev->subsystem_vendor != PCI_VENDOR_ID_LENOVO ||
 	    pdev->subsystem_device != 0x222e ||
-	    !pdev->reset_fn)
+	    !pci_reset_supported(pdev))
 		return;
 
 	if (pci_enable_device_mem(pdev))
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index dd12c2fcc..4c54c7505 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -19,7 +19,6 @@ static void pci_stop_dev(struct pci_dev *dev)
 	pci_pme_active(dev, false);
 
 	if (pci_dev_is_added(dev)) {
-		dev->reset_fn = 0;
 
 		device_release_driver(&dev->dev);
 		pci_proc_detach_device(dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0955246f8..6e9bc4f9c 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -429,7 +429,6 @@ struct pci_dev {
 	unsigned int	state_saved:1;
 	unsigned int	is_physfn:1;
 	unsigned int	is_virtfn:1;
-	unsigned int	reset_fn:1;
 	unsigned int	is_hotplug_bridge:1;
 	unsigned int	shpc_managed:1;		/* SHPC owned by shpchp */
 	unsigned int	is_thunderbolt:1;	/* Thunderbolt controller */
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 4/8] PCI/sysfs: Allow userspace to query and set device reset mechanism
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
                   ` (2 preceding siblings ...)
  2021-06-07 18:21 ` [PATCH v6 3/8] PCI: Remove reset_fn field from pci_dev Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 5/8] PCI: Setup ACPI_COMPANION early Amey Narkhede
                   ` (3 subsequent siblings)
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya, Amey Narkhede

Add reset_method sysfs attribute to enable user to
query and set user preferred device reset methods and
their ordering.

Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 Documentation/ABI/testing/sysfs-bus-pci |  16 ++++
 drivers/pci/pci-sysfs.c                 | 118 ++++++++++++++++++++++++
 2 files changed, 134 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index ef00fada2..cf6dbbb3c 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -121,6 +121,22 @@ Description:
 		child buses, and re-discover devices removed earlier
 		from this part of the device tree.
 
+What:		/sys/bus/pci/devices/.../reset_method
+Date:		March 2021
+Contact:	Amey Narkhede <ameynarkhede03@gmail.com>
+Description:
+		Some devices allow an individual function to be reset
+		without affecting other functions in the same slot.
+		For devices that have this support, a file named reset_method
+		will be present in sysfs. Reading this file will give names
+		of the device supported reset methods and their ordering.
+		Writing the name or comma separated list of names of any of
+		the device supported reset methods to this file will set the
+		reset methods and their ordering to be used when resetting
+		the device. Writing empty string to this file will disable
+		ability to reset the device and writing "default" will return
+		to the original value.
+
 What:		/sys/bus/pci/devices/.../reset
 Date:		July 2009
 Contact:	Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 316f70c3e..52def79aa 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1334,6 +1334,123 @@ static const struct attribute_group pci_dev_rom_attr_group = {
 	.is_bin_visible = pci_dev_rom_attr_is_visible,
 };
 
+static ssize_t reset_method_show(struct device *dev,
+				 struct device_attribute *attr,
+				 char *buf)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	ssize_t len = 0;
+	int i, prio;
+
+	for (prio = PCI_RESET_METHODS_NUM; prio; prio--) {
+		for (i = 0; i < PCI_RESET_METHODS_NUM; i++) {
+			if (prio == pdev->reset_methods[i]) {
+				len += sysfs_emit_at(buf, len, "%s%s",
+						     len ? "," : "",
+						     pci_reset_fn_methods[i].name);
+				break;
+			}
+		}
+
+		if (i == PCI_RESET_METHODS_NUM)
+			break;
+	}
+
+	if (len)
+		len += sysfs_emit_at(buf, len, "\n");
+
+	return len;
+}
+
+static ssize_t reset_method_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	u8 reset_methods[PCI_RESET_METHODS_NUM];
+	struct pci_dev *pdev = to_pci_dev(dev);
+	u8 prio = PCI_RESET_METHODS_NUM;
+	char *name, *options;
+	int i;
+
+	if (count >= (PAGE_SIZE - 1))
+		return -EINVAL;
+
+	options = kstrndup(buf, count, GFP_KERNEL);
+	if (!options)
+		return -ENOMEM;
+
+	/*
+	 * Initialize reset_method such that 0xff indicates
+	 * supported but not currently enabled reset methods
+	 * as we only use priority values which are within
+	 * the range of PCI_RESET_FN_METHODS array size
+	 */
+	for (i = 0; i < PCI_RESET_METHODS_NUM; i++)
+		reset_methods[i] = pdev->reset_methods[i] ? 0xff : 0;
+
+	if (sysfs_streq(options, "")) {
+		pci_warn(pdev, "All device reset methods disabled by user");
+		goto set_reset_methods;
+	}
+
+	if (sysfs_streq(options, "default")) {
+		for (i = 0; i < PCI_RESET_METHODS_NUM; i++)
+			reset_methods[i] = reset_methods[i] ? prio-- : 0;
+		goto set_reset_methods;
+	}
+
+	while ((name = strsep(&options, ",")) != NULL) {
+		if (sysfs_streq(name, ""))
+			continue;
+
+		name = strim(name);
+
+		for (i = 0; i < PCI_RESET_METHODS_NUM; i++) {
+			if (reset_methods[i] &&
+			    sysfs_streq(name, pci_reset_fn_methods[i].name)) {
+				reset_methods[i] = prio--;
+				break;
+			}
+		}
+
+		if (i == PCI_RESET_METHODS_NUM) {
+			kfree(options);
+			return -EINVAL;
+		}
+	}
+
+	if (reset_methods[0] &&
+	    reset_methods[0] != PCI_RESET_METHODS_NUM)
+		pci_warn(pdev, "Device specific reset disabled/de-prioritized by user");
+
+set_reset_methods:
+	kfree(options);
+	memcpy(pdev->reset_methods, reset_methods, sizeof(reset_methods));
+	return count;
+}
+static DEVICE_ATTR_RW(reset_method);
+
+static struct attribute *pci_dev_reset_method_attrs[] = {
+	&dev_attr_reset_method.attr,
+	NULL,
+};
+
+static umode_t pci_dev_reset_method_attr_is_visible(struct kobject *kobj,
+						    struct attribute *a, int n)
+{
+	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+
+	if (!pci_reset_supported(pdev))
+		return 0;
+
+	return a->mode;
+}
+
+static const struct attribute_group pci_dev_reset_method_attr_group = {
+	.attrs = pci_dev_reset_method_attrs,
+	.is_visible = pci_dev_reset_method_attr_is_visible,
+};
+
 static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
 			   const char *buf, size_t count)
 {
@@ -1491,6 +1608,7 @@ const struct attribute_group *pci_dev_groups[] = {
 	&pci_dev_config_attr_group,
 	&pci_dev_rom_attr_group,
 	&pci_dev_reset_attr_group,
+	&pci_dev_reset_method_attr_group,
 	&pci_dev_vpd_attr_group,
 #ifdef CONFIG_DMI
 	&pci_dev_smbios_attr_group,
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 5/8] PCI: Setup ACPI_COMPANION early
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
                   ` (3 preceding siblings ...)
  2021-06-07 18:21 ` [PATCH v6 4/8] PCI/sysfs: Allow userspace to query and set device reset mechanism Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 6/8] PCI: Add support for ACPI _RST reset method Amey Narkhede
                   ` (2 subsequent siblings)
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya

From: Shanker Donthineni <sdonthineni@nvidia.com>

Currently, the ACPI_COMPANION is not available until device_add().
The software features which have dependency on ACPI fwnode properties
and needs to be handled before device_add() will not work. One use
case, software has to check the existence of _RST method to support
ACPI based reset mechanism.

This patch adds a new function pci_set_acpi_fwnode() for setting the
ACPI_COMPANION, same code which is available in acpi_pci_bridge_d3().

Call pci_set_acpi_fwnode() from pci_scan_device() to fix the issue.

Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
---
 drivers/pci/pci-acpi.c | 12 ++++++++----
 drivers/pci/pci.h      |  2 ++
 drivers/pci/probe.c    |  2 ++
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 36bc23e21..eaddbf701 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -934,6 +934,13 @@ static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
 
 static struct acpi_device *acpi_pci_find_companion(struct device *dev);
 
+void pci_set_acpi_fwnode(struct pci_dev *dev)
+{
+	if (!ACPI_COMPANION(&dev->dev) && !pci_dev_is_added(dev))
+		ACPI_COMPANION_SET(&dev->dev,
+				   acpi_pci_find_companion(&dev->dev));
+}
+
 static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 {
 	const struct fwnode_handle *fwnode;
@@ -945,11 +952,8 @@ static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 		return false;
 
 	/* Assume D3 support if the bridge is power-manageable by ACPI. */
+	pci_set_acpi_fwnode(dev);
 	adev = ACPI_COMPANION(&dev->dev);
-	if (!adev && !pci_dev_is_added(dev)) {
-		adev = acpi_pci_find_companion(&dev->dev);
-		ACPI_COMPANION_SET(&dev->dev, adev);
-	}
 
 	if (adev && acpi_device_power_manageable(adev))
 		return true;
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 13ec6bd6f..d22da6d3c 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -703,7 +703,9 @@ static inline int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL
 #ifdef CONFIG_ACPI
 int pci_acpi_program_hp_params(struct pci_dev *dev);
 extern const struct attribute_group pci_dev_acpi_attr_group;
+void pci_set_acpi_fwnode(struct pci_dev *dev);
 #else
+static inline void pci_set_acpi_fwnode(struct pci_dev *dev) {}
 static inline int pci_acpi_program_hp_params(struct pci_dev *dev)
 {
 	return -ENODEV;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 90fd4f61f..dfefa5ed0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2359,6 +2359,8 @@ static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
 		return NULL;
 	}
 
+	pci_set_acpi_fwnode(dev);
+
 	return dev;
 }
 
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 6/8] PCI: Add support for ACPI _RST reset method
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
                   ` (4 preceding siblings ...)
  2021-06-07 18:21 ` [PATCH v6 5/8] PCI: Setup ACPI_COMPANION early Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 7/8] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions Amey Narkhede
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya

From: Shanker Donthineni <sdonthineni@nvidia.com>

The _RST is a standard method specified in the ACPI specification. It
provides a function level reset when it is described in the acpi_device
context associated with PCI-device. Implement a new reset function
pci_dev_acpi_reset() for probing RST method and execute if it is defined
in the firmware.

The default priority of the ACPI reset is set to below device-specific
and above hardware resets.

Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
---
 drivers/pci/pci-acpi.c | 23 +++++++++++++++++++++++
 drivers/pci/pci.c      |  1 +
 drivers/pci/pci.h      |  6 ++++++
 include/linux/pci.h    |  2 +-
 4 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index eaddbf701..40dd24cd3 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -941,6 +941,29 @@ void pci_set_acpi_fwnode(struct pci_dev *dev)
 				   acpi_pci_find_companion(&dev->dev));
 }
 
+/**
+ * pci_dev_acpi_reset - do a function level reset using _RST method
+ * @dev: device to reset
+ * @probe: check if _RST method is included in the acpi_device context.
+ */
+int pci_dev_acpi_reset(struct pci_dev *dev, int probe)
+{
+	acpi_handle handle = ACPI_HANDLE(&dev->dev);
+
+	if (!handle || !acpi_has_method(handle, "_RST"))
+		return -ENOTTY;
+
+	if (probe)
+		return 0;
+
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_RST", NULL, NULL))) {
+		pci_warn(dev, "ACPI _RST failed\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 static bool acpi_pci_bridge_d3(struct pci_dev *dev)
 {
 	const struct fwnode_handle *fwnode;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2302aa421..2e7efd7e7 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5121,6 +5121,7 @@ static void pci_dev_restore(struct pci_dev *dev)
  */
 const struct pci_reset_fn_method pci_reset_fn_methods[] = {
 	{ &pci_dev_specific_reset, .name = "device_specific" },
+	{ &pci_dev_acpi_reset, .name = "acpi" },
 	{ &pcie_reset_flr, .name = "flr" },
 	{ &pci_af_flr, .name = "af_flr" },
 	{ &pci_pm_reset, .name = "pm" },
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index d22da6d3c..e9cfb7cd6 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -704,7 +704,13 @@ static inline int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL
 int pci_acpi_program_hp_params(struct pci_dev *dev);
 extern const struct attribute_group pci_dev_acpi_attr_group;
 void pci_set_acpi_fwnode(struct pci_dev *dev);
+int pci_dev_acpi_reset(struct pci_dev *dev, int probe);
 #else
+static inline int pci_dev_acpi_reset(struct pci_dev *dev, int probe)
+{
+	return -ENOTTY;
+}
+
 static inline void pci_set_acpi_fwnode(struct pci_dev *dev) {}
 static inline int pci_acpi_program_hp_params(struct pci_dev *dev)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6e9bc4f9c..a7f063da2 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -49,7 +49,7 @@
 			       PCI_STATUS_SIG_TARGET_ABORT | \
 			       PCI_STATUS_PARITY)
 
-#define PCI_RESET_METHODS_NUM 5
+#define PCI_RESET_METHODS_NUM 6
 
 /*
  * The PCI interface treats multi-function devices as independent
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 7/8] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
                   ` (5 preceding siblings ...)
  2021-06-07 18:21 ` [PATCH v6 6/8] PCI: Add support for ACPI _RST reset method Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 18:21 ` [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions Amey Narkhede
  7 siblings, 0 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya

From: Shanker Donthineni <sdonthineni@nvidia.com>

On select platforms, some Nvidia GPU devices do not work with SBR.
Triggering SBR would leave the device inoperable for the current
system boot. It requires a system hard-reboot to get the GPU device
back to normal operating condition post-SBR. For the affected
devices, enable NO_BUS_RESET quirk to fix the issue.

This issue will be fixed in the next generation of hardware.

Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
---
 drivers/pci/quirks.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e86cf4a3b..45a8c3caa 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3546,6 +3546,18 @@ static void quirk_no_bus_reset(struct pci_dev *dev)
 	dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;
 }
 
+/*
+ * Some Nvidia GPU devices do not work with bus reset, SBR needs to be
+ * prevented for those affected devices.
+ */
+static void quirk_nvidia_no_bus_reset(struct pci_dev *dev)
+{
+	if ((dev->device & 0xffc0) == 0x2340)
+		quirk_no_bus_reset(dev);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
+			 quirk_nvidia_no_bus_reset);
+
 /*
  * Some Atheros AR9xxx and QCA988x chips do not behave after a bus reset.
  * The device will throw a Link Down error on AER-capable systems and
-- 
2.31.1


^ permalink raw reply related	[flat|nested] 12+ messages in thread
* [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions
  2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
                   ` (6 preceding siblings ...)
  2021-06-07 18:21 ` [PATCH v6 7/8] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs Amey Narkhede
@ 2021-06-07 18:21 ` Amey Narkhede
  2021-06-07 22:58     ` kernel test robot
  2021-06-08  0:44   ` Shanker R Donthineni
  7 siblings, 2 replies; 12+ messages in thread
From: Amey Narkhede @ 2021-06-07 18:21 UTC (permalink / raw)
  To: Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Shanker Donthineni, Sinan Kaya, Amey Narkhede

Introduce a new enum pci_reset_mode_t to make the context of probe argument
in reset functions clear and the code easier to read.
Change the type of probe argument in functions which implement reset
methods from int to pci_reset_mode_t to make the intent clear.

Add a new line in return statement of pci_reset_bus_function().

Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Suggested-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 drivers/crypto/cavium/nitrox/nitrox_main.c    |  2 +-
 .../ethernet/cavium/liquidio/lio_vf_main.c    |  2 +-
 drivers/pci/hotplug/pciehp.h                  |  2 +-
 drivers/pci/hotplug/pciehp_hpc.c              |  4 +-
 drivers/pci/pci-acpi.c                        | 10 ++-
 drivers/pci/pci.c                             | 85 ++++++++++++-------
 drivers/pci/pci.h                             | 10 +--
 drivers/pci/pcie/aer.c                        |  2 +-
 drivers/pci/quirks.c                          | 37 ++++----
 include/linux/pci.h                           |  8 +-
 include/linux/pci_hotplug.h                   |  2 +-
 11 files changed, 100 insertions(+), 64 deletions(-)

diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c
index 15d6c8452..f97fa8e99 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_main.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_main.c
@@ -306,7 +306,7 @@ static int nitrox_device_flr(struct pci_dev *pdev)
 		return -ENOMEM;
 	}

-	pcie_reset_flr(pdev, 0);
+	pcie_reset_flr(pdev, PCI_RESET_DO_RESET);

 	pci_restore_state(pdev);

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index 336d149ee..6e666be69 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -526,7 +526,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 			oct->irq_name_storage = NULL;
 		}
 		/* Soft reset the octeon device before exiting */
-		if (!pcie_reset_flr(oct->pci_dev, 1))
+		if (!pcie_reset_flr(oct->pci_dev, PCI_RESET_PROBE))
 			octeon_pci_flr(oct);
 		else
 			cn23xx_vf_ask_pf_to_do_flr(oct);
diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
index 4fd200d8b..87da03adc 100644
--- a/drivers/pci/hotplug/pciehp.h
+++ b/drivers/pci/hotplug/pciehp.h
@@ -181,7 +181,7 @@ void pciehp_release_ctrl(struct controller *ctrl);

 int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot);
 int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot);
-int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, int probe);
+int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, pci_reset_mode_t mode);
 int pciehp_get_attention_status(struct hotplug_slot *hotplug_slot, u8 *status);
 int pciehp_set_raw_indicator_status(struct hotplug_slot *h_slot, u8 status);
 int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status);
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index fb3840e22..24b3c8787 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -834,14 +834,14 @@ void pcie_disable_interrupt(struct controller *ctrl)
  * momentarily, if we see that they could interfere. Also, clear any spurious
  * events after.
  */
-int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, int probe)
+int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, pci_reset_mode_t mode)
 {
 	struct controller *ctrl = to_ctrl(hotplug_slot);
 	struct pci_dev *pdev = ctrl_dev(ctrl);
 	u16 stat_mask = 0, ctrl_mask = 0;
 	int rc;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	down_write(&ctrl->reset_lock);
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 40dd24cd3..9de334457 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -944,16 +944,20 @@ void pci_set_acpi_fwnode(struct pci_dev *dev)
 /**
  * pci_dev_acpi_reset - do a function level reset using _RST method
  * @dev: device to reset
- * @probe: check if _RST method is included in the acpi_device context.
+ * @probe: If PCI_RESET_PROBE, check whether _RST method is included
+ *         in the acpi_device context.
  */
-int pci_dev_acpi_reset(struct pci_dev *dev, int probe)
+int pci_dev_acpi_reset(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	acpi_handle handle = ACPI_HANDLE(&dev->dev);

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (!handle || !acpi_has_method(handle, "_RST"))
 		return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_RST", NULL, NULL))) {
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 2e7efd7e7..e28611d7c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4650,14 +4650,17 @@ 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.
+ * @mode: If PCI_RESET_PROBE, 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)
+int pcie_reset_flr(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	u32 cap;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET)
 		return -ENOTTY;

@@ -4665,18 +4668,21 @@ int pcie_reset_flr(struct pci_dev *dev, int probe)
 	if (!(cap & PCI_EXP_DEVCAP_FLR))
 		return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	return pcie_flr(dev);
 }
 EXPORT_SYMBOL_GPL(pcie_reset_flr);

-static int pci_af_flr(struct pci_dev *dev, int probe)
+static int pci_af_flr(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	int pos;
 	u8 cap;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	pos = pci_find_capability(dev, PCI_CAP_ID_AF);
 	if (!pos)
 		return -ENOTTY;
@@ -4688,7 +4694,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe)
 	if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR))
 		return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	/*
@@ -4719,7 +4725,7 @@ static int pci_af_flr(struct pci_dev *dev, int probe)
 /**
  * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
  * @dev: Device to reset.
- * @probe: If set, only check if the device can be reset this way.
+ * @mode: If PCI_RESET_PROBE, only check if the device can be reset this way.
  *
  * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
  * unset, it will be reinitialized internally when going from PCI_D3hot to
@@ -4731,10 +4737,13 @@ static int pci_af_flr(struct pci_dev *dev, int probe)
  * by default (i.e. unless the @dev's d3hot_delay field has a different value).
  * Moreover, only devices in D0 can be reset by this function.
  */
-static int pci_pm_reset(struct pci_dev *dev, int probe)
+static int pci_pm_reset(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	u16 csr;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (!dev->pm_cap || dev->dev_flags & PCI_DEV_FLAGS_NO_PM_RESET)
 		return -ENOTTY;

@@ -4742,7 +4751,7 @@ static int pci_pm_reset(struct pci_dev *dev, int probe)
 	if (csr & PCI_PM_CTRL_NO_SOFT_RESET)
 		return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	if (dev->current_state != PCI_D0)
@@ -4991,10 +5000,13 @@ int pci_bridge_secondary_bus_reset(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_bridge_secondary_bus_reset);

-static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
+static int pci_parent_bus_reset(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	struct pci_dev *pdev;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (pci_is_root_bus(dev->bus) || dev->subordinate ||
 	    !dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
 		return -ENOTTY;
@@ -5003,44 +5015,47 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
 		if (pdev != dev)
 			return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	return pci_bridge_secondary_bus_reset(dev->bus->self);
 }

-static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
+static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, pci_reset_mode_t mode)
 {
 	int rc = -ENOTTY;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (!hotplug || !try_module_get(hotplug->owner))
 		return rc;

 	if (hotplug->ops->reset_slot)
-		rc = hotplug->ops->reset_slot(hotplug, probe);
+		rc = hotplug->ops->reset_slot(hotplug, mode);

 	module_put(hotplug->owner);

 	return rc;
 }

-static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe)
+static int pci_dev_reset_slot_function(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	if (dev->multifunction || dev->subordinate || !dev->slot ||
 	    dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)
 		return -ENOTTY;

-	return pci_reset_hotplug_slot(dev->slot->hotplug, probe);
+	return pci_reset_hotplug_slot(dev->slot->hotplug, mode);
 }

-static int pci_reset_bus_function(struct pci_dev *dev, int probe)
+static int pci_reset_bus_function(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	int rc;

-	rc = pci_dev_reset_slot_function(dev, probe);
+	rc = pci_dev_reset_slot_function(dev, mode);
 	if (rc != -ENOTTY)
 		return rc;
-	return pci_parent_bus_reset(dev, probe);
+	return pci_parent_bus_reset(dev, mode);
 }

 static void pci_dev_lock(struct pci_dev *dev)
@@ -5168,7 +5183,7 @@ int __pci_reset_function_locked(struct pci_dev *dev)
 				 * finished: this indicates that further reset
 				 * mechanisms might be broken on the device.
 				 */
-				rc = pci_reset_fn_methods[i].reset_fn(dev, 0);
+				rc = pci_reset_fn_methods[i].reset_fn(dev, PCI_RESET_DO_RESET);
 				if (rc != -ENOTTY)
 					return rc;
 				break;
@@ -5204,7 +5219,7 @@ void pci_init_reset_methods(struct pci_dev *dev)
 	might_sleep();

 	for (i = 0; i < PCI_RESET_METHODS_NUM; i++) {
-		rc = pci_reset_fn_methods[i].reset_fn(dev, 1);
+		rc = pci_reset_fn_methods[i].reset_fn(dev, PCI_RESET_PROBE);
 		if (!rc)
 			reset_methods[i] = prio--;
 		else if (rc != -ENOTTY)
@@ -5520,21 +5535,24 @@ static void pci_slot_restore_locked(struct pci_slot *slot)
 	}
 }

-static int pci_slot_reset(struct pci_slot *slot, int probe)
+static int pci_slot_reset(struct pci_slot *slot, pci_reset_mode_t mode)
 {
 	int rc;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (!slot || !pci_slot_resetable(slot))
 		return -ENOTTY;

-	if (!probe)
+	if (mode != PCI_RESET_PROBE)
 		pci_slot_lock(slot);

 	might_sleep();

-	rc = pci_reset_hotplug_slot(slot->hotplug, probe);
+	rc = pci_reset_hotplug_slot(slot->hotplug, mode);

-	if (!probe)
+	if (mode != PCI_RESET_PROBE)
 		pci_slot_unlock(slot);

 	return rc;
@@ -5548,7 +5566,7 @@ static int pci_slot_reset(struct pci_slot *slot, int probe)
  */
 int pci_probe_reset_slot(struct pci_slot *slot)
 {
-	return pci_slot_reset(slot, 1);
+	return pci_slot_reset(slot, PCI_RESET_PROBE);
 }
 EXPORT_SYMBOL_GPL(pci_probe_reset_slot);

@@ -5571,14 +5589,14 @@ static int __pci_reset_slot(struct pci_slot *slot)
 {
 	int rc;

-	rc = pci_slot_reset(slot, 1);
+	rc = pci_slot_reset(slot, PCI_RESET_PROBE);
 	if (rc)
 		return rc;

 	if (pci_slot_trylock(slot)) {
 		pci_slot_save_and_disable_locked(slot);
 		might_sleep();
-		rc = pci_reset_hotplug_slot(slot->hotplug, 0);
+		rc = pci_reset_hotplug_slot(slot->hotplug, PCI_RESET_DO_RESET);
 		pci_slot_restore_locked(slot);
 		pci_slot_unlock(slot);
 	} else
@@ -5587,14 +5605,17 @@ static int __pci_reset_slot(struct pci_slot *slot)
 	return rc;
 }

-static int pci_bus_reset(struct pci_bus *bus, int probe)
+static int pci_bus_reset(struct pci_bus *bus, pci_reset_mode_t mode)
 {
 	int ret;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	if (!bus->self || !pci_bus_resetable(bus))
 		return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	pci_bus_lock(bus);
@@ -5633,14 +5654,14 @@ int pci_bus_error_reset(struct pci_dev *bridge)
 			goto bus_reset;

 	list_for_each_entry(slot, &bus->slots, list)
-		if (pci_slot_reset(slot, 0))
+		if (pci_slot_reset(slot, PCI_RESET_DO_RESET))
 			goto bus_reset;

 	mutex_unlock(&pci_slot_mutex);
 	return 0;
 bus_reset:
 	mutex_unlock(&pci_slot_mutex);
-	return pci_bus_reset(bridge->subordinate, 0);
+	return pci_bus_reset(bridge->subordinate, PCI_RESET_DO_RESET);
 }

 /**
@@ -5651,7 +5672,7 @@ int pci_bus_error_reset(struct pci_dev *bridge)
  */
 int pci_probe_reset_bus(struct pci_bus *bus)
 {
-	return pci_bus_reset(bus, 1);
+	return pci_bus_reset(bus, PCI_RESET_PROBE);
 }
 EXPORT_SYMBOL_GPL(pci_probe_reset_bus);

@@ -5665,7 +5686,7 @@ static int __pci_reset_bus(struct pci_bus *bus)
 {
 	int rc;

-	rc = pci_bus_reset(bus, 1);
+	rc = pci_bus_reset(bus, PCI_RESET_PROBE);
 	if (rc)
 		return rc;

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index e9cfb7cd6..21ac02a9d 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -603,19 +603,19 @@ static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
 struct pci_dev_reset_methods {
 	u16 vendor;
 	u16 device;
-	int (*reset)(struct pci_dev *dev, int probe);
+	int (*reset)(struct pci_dev *dev, pci_reset_mode_t mode);
 };

 struct pci_reset_fn_method {
-	int (*reset_fn)(struct pci_dev *pdev, int probe);
+	int (*reset_fn)(struct pci_dev *pdev, pci_reset_mode_t mode);
 	char *name;
 };

 extern const struct pci_reset_fn_method pci_reset_fn_methods[];
 #ifdef CONFIG_PCI_QUIRKS
-int pci_dev_specific_reset(struct pci_dev *dev, int probe);
+int pci_dev_specific_reset(struct pci_dev *dev, pci_reset_mode_t mode);
 #else
-static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe)
+static inline int pci_dev_specific_reset(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	return -ENOTTY;
 }
@@ -704,7 +704,7 @@ static inline int pci_aer_raw_clear_status(struct pci_dev *dev) { return -EINVAL
 int pci_acpi_program_hp_params(struct pci_dev *dev);
 extern const struct attribute_group pci_dev_acpi_attr_group;
 void pci_set_acpi_fwnode(struct pci_dev *dev);
-int pci_dev_acpi_reset(struct pci_dev *dev, int probe);
+int pci_dev_acpi_reset(struct pci_dev *dev, pci_reset_mode_t mode);
 #else
 static inline int pci_dev_acpi_reset(struct pci_dev *dev, int probe)
 {
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 98077595a..cfa7a1775 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1405,7 +1405,7 @@ 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) {
-		rc = pcie_reset_flr(dev, 0);
+		rc = pcie_reset_flr(dev, PCI_RESET_DO_RESET);
 		if (!rc)
 			pci_info(dev, "has been reset\n");
 		else
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 45a8c3caa..60fd101ac 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3681,7 +3681,7 @@ DECLARE_PCI_FIXUP_SUSPEND_LATE(PCI_VENDOR_ID_INTEL,
  * reset a single function if other methods (e.g. FLR, PM D0->D3) are
  * not available.
  */
-static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe)
+static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	/*
 	 * http://www.intel.com/content/dam/doc/datasheet/82599-10-gbe-controller-datasheet.pdf
@@ -3691,7 +3691,7 @@ static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe)
 	 * Thus we must call pcie_flr() directly without first checking if it is
 	 * supported.
 	 */
-	if (!probe)
+	if (mode == PCI_RESET_DO_RESET)
 		pcie_flr(dev);
 	return 0;
 }
@@ -3703,13 +3703,13 @@ static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe)
 #define NSDE_PWR_STATE		0xd0100
 #define IGD_OPERATION_TIMEOUT	10000     /* set timeout 10 seconds */

-static int reset_ivb_igd(struct pci_dev *dev, int probe)
+static int reset_ivb_igd(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	void __iomem *mmio_base;
 	unsigned long timeout;
 	u32 val;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	mmio_base = pci_iomap(dev, 0, 0);
@@ -3746,7 +3746,7 @@ static int reset_ivb_igd(struct pci_dev *dev, int probe)
 }

 /* Device-specific reset method for Chelsio T4-based adapters */
-static int reset_chelsio_generic_dev(struct pci_dev *dev, int probe)
+static int reset_chelsio_generic_dev(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	u16 old_command;
 	u16 msix_flags;
@@ -3762,7 +3762,7 @@ static int reset_chelsio_generic_dev(struct pci_dev *dev, int probe)
 	 * If this is the "probe" phase, return 0 indicating that we can
 	 * reset this device.
 	 */
-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	/*
@@ -3824,17 +3824,17 @@ static int reset_chelsio_generic_dev(struct pci_dev *dev, int probe)
  *    Chapter 3: NVMe control registers
  *    Chapter 7.3: Reset behavior
  */
-static int nvme_disable_and_flr(struct pci_dev *dev, int probe)
+static int nvme_disable_and_flr(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	void __iomem *bar;
 	u16 cmd;
 	u32 cfg;

 	if (dev->class != PCI_CLASS_STORAGE_EXPRESS ||
-	    pcie_reset_flr(dev, 1) || !pci_resource_start(dev, 0))
+	    pcie_reset_flr(dev, PCI_RESET_PROBE) || !pci_resource_start(dev, 0))
 		return -ENOTTY;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	bar = pci_iomap(dev, 0, NVME_REG_CC + sizeof(cfg));
@@ -3898,11 +3898,13 @@ static int nvme_disable_and_flr(struct pci_dev *dev, int probe)
  * device too soon after FLR.  A 250ms delay after FLR has heuristically
  * proven to produce reliably working results for device assignment cases.
  */
-static int delay_250ms_after_flr(struct pci_dev *dev, int probe)
+static int delay_250ms_after_flr(struct pci_dev *dev, pci_reset_mode_t mode)
 {
-	int ret = pcie_reset_flr(dev, probe);
+	int ret;
+
+	ret = pcie_reset_flr(dev, mode);

-	if (probe)
+	if (ret || mode == PCI_RESET_PROBE)
 		return ret;

 	msleep(250);
@@ -3918,13 +3920,13 @@ static int delay_250ms_after_flr(struct pci_dev *dev, int probe)
 #define HINIC_OPERATION_TIMEOUT     15000	/* 15 seconds */

 /* Device-specific reset method for Huawei Intelligent NIC virtual functions */
-static int reset_hinic_vf_dev(struct pci_dev *pdev, int probe)
+static int reset_hinic_vf_dev(struct pci_dev *pdev, pci_reset_mode_t mode)
 {
 	unsigned long timeout;
 	void __iomem *bar;
 	u32 val;

-	if (probe)
+	if (mode == PCI_RESET_PROBE)
 		return 0;

 	bar = pci_iomap(pdev, 0, 0);
@@ -3995,16 +3997,19 @@ static const struct pci_dev_reset_methods pci_dev_reset_methods[] = {
  * because when a host assigns a device to a guest VM, the host may need
  * to reset the device but probably doesn't have a driver for it.
  */
-int pci_dev_specific_reset(struct pci_dev *dev, int probe)
+int pci_dev_specific_reset(struct pci_dev *dev, pci_reset_mode_t mode)
 {
 	const struct pci_dev_reset_methods *i;

+	if (mode >= PCI_RESET_MODE_MAX)
+		return -EINVAL;
+
 	for (i = pci_dev_reset_methods; i->reset; i++) {
 		if ((i->vendor == dev->vendor ||
 		     i->vendor == (u16)PCI_ANY_ID) &&
 		    (i->device == dev->device ||
 		     i->device == (u16)PCI_ANY_ID))
-			return i->reset(dev, probe);
+			return i->reset(dev, mode);
 	}

 	return -ENOTTY;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a7f063da2..c46df52e6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -51,6 +51,12 @@

 #define PCI_RESET_METHODS_NUM 6

+typedef enum pci_reset_mode {
+	PCI_RESET_DO_RESET,
+	PCI_RESET_PROBE,
+	PCI_RESET_MODE_MAX,
+} pci_reset_mode_t;
+
 /*
  * The PCI interface treats multi-function devices as independent
  * devices.  The slot/function address of each device is encoded
@@ -1230,7 +1236,7 @@ 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);
-int pcie_reset_flr(struct pci_dev *dev, int probe);
+int pcie_reset_flr(struct pci_dev *dev, pci_reset_mode_t mode);
 int pcie_flr(struct pci_dev *dev);
 bool pci_reset_supported(struct pci_dev *dev);
 int __pci_reset_function_locked(struct pci_dev *dev);
diff --git a/include/linux/pci_hotplug.h b/include/linux/pci_hotplug.h
index b482e42d7..9e8da46e7 100644
--- a/include/linux/pci_hotplug.h
+++ b/include/linux/pci_hotplug.h
@@ -44,7 +44,7 @@ struct hotplug_slot_ops {
 	int (*get_attention_status)	(struct hotplug_slot *slot, u8 *value);
 	int (*get_latch_status)		(struct hotplug_slot *slot, u8 *value);
 	int (*get_adapter_status)	(struct hotplug_slot *slot, u8 *value);
-	int (*reset_slot)		(struct hotplug_slot *slot, int probe);
+	int (*reset_slot)		(struct hotplug_slot *slot, pci_reset_mode_t mode);
 };

 /**
--
2.31.1

^ permalink raw reply related	[flat|nested] 12+ messages in thread
* Re: [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions
  2021-06-07 18:21 ` [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions Amey Narkhede
@ 2021-06-07 22:58     ` kernel test robot
  2021-06-08  0:44   ` Shanker R Donthineni
  1 sibling, 0 replies; 12+ messages in thread
From: kernel test robot @ 2021-06-07 22:58 UTC (permalink / raw)
  To: Amey Narkhede, Bjorn Helgaas
  Cc: kbuild-all, clang-built-linux, alex.williamson, Raphael Norwitz,
	linux-pci, linux-kernel, kw, Shanker Donthineni, Sinan Kaya,
	Amey Narkhede

[-- Attachment #1: Type: text/plain, Size: 3397 bytes --]

Hi Amey,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on pci/next]
[also build test ERROR on next-20210607]
[cannot apply to pm/linux-next cryptodev/master crypto/master linus/master v5.13-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Amey-Narkhede/Expose-and-manage-PCI-device-reset/20210608-022554
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: arm64-randconfig-r031-20210607 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project ae973380c5f6be77ce395022be40350942260be9)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/827552fbc3a1722cd8f6d5e81c4806670fd5545f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Amey-Narkhede/Expose-and-manage-PCI-device-reset/20210608-022554
        git checkout 827552fbc3a1722cd8f6d5e81c4806670fd5545f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/pci/pci.c:5139:4: error: incompatible function pointer types initializing 'int (*)(struct pci_dev *, pci_reset_mode_t)' (aka 'int (*)(struct pci_dev *, enum pci_reset_mode)') with an expression of type 'int (*)(struct pci_dev *, int)' [-Werror,-Wincompatible-function-pointer-types]
           { &pci_dev_acpi_reset, .name = "acpi" },
             ^~~~~~~~~~~~~~~~~~~
   1 error generated.


vim +5139 drivers/pci/pci.c

3ebe7f9f7e4a4f Keith Busch        2014-05-02  5132  
c09bbd373f3e96 Amey Narkhede      2021-06-07  5133  /*
c09bbd373f3e96 Amey Narkhede      2021-06-07  5134   * The ordering for functions in pci_reset_fn_methods is required for
c09bbd373f3e96 Amey Narkhede      2021-06-07  5135   * reset_methods byte array defined in struct pci_dev.
c09bbd373f3e96 Amey Narkhede      2021-06-07  5136   */
c09bbd373f3e96 Amey Narkhede      2021-06-07  5137  const struct pci_reset_fn_method pci_reset_fn_methods[] = {
c09bbd373f3e96 Amey Narkhede      2021-06-07  5138  	{ &pci_dev_specific_reset, .name = "device_specific" },
ccbe2295e8be73 Shanker Donthineni 2021-06-07 @5139  	{ &pci_dev_acpi_reset, .name = "acpi" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5140  	{ &pcie_reset_flr, .name = "flr" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5141  	{ &pci_af_flr, .name = "af_flr" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5142  	{ &pci_pm_reset, .name = "pm" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5143  	{ &pci_reset_bus_function, .name = "bus" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5144  };
c09bbd373f3e96 Amey Narkhede      2021-06-07  5145  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 36844 bytes --]

^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions
@ 2021-06-07 22:58     ` kernel test robot
  0 siblings, 0 replies; 12+ messages in thread
From: kernel test robot @ 2021-06-07 22:58 UTC (permalink / raw)
  To: kbuild-all

[-- Attachment #1: Type: text/plain, Size: 3457 bytes --]

Hi Amey,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on pci/next]
[also build test ERROR on next-20210607]
[cannot apply to pm/linux-next cryptodev/master crypto/master linus/master v5.13-rc5]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Amey-Narkhede/Expose-and-manage-PCI-device-reset/20210608-022554
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: arm64-randconfig-r031-20210607 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project ae973380c5f6be77ce395022be40350942260be9)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/827552fbc3a1722cd8f6d5e81c4806670fd5545f
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Amey-Narkhede/Expose-and-manage-PCI-device-reset/20210608-022554
        git checkout 827552fbc3a1722cd8f6d5e81c4806670fd5545f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/pci/pci.c:5139:4: error: incompatible function pointer types initializing 'int (*)(struct pci_dev *, pci_reset_mode_t)' (aka 'int (*)(struct pci_dev *, enum pci_reset_mode)') with an expression of type 'int (*)(struct pci_dev *, int)' [-Werror,-Wincompatible-function-pointer-types]
           { &pci_dev_acpi_reset, .name = "acpi" },
             ^~~~~~~~~~~~~~~~~~~
   1 error generated.


vim +5139 drivers/pci/pci.c

3ebe7f9f7e4a4f Keith Busch        2014-05-02  5132  
c09bbd373f3e96 Amey Narkhede      2021-06-07  5133  /*
c09bbd373f3e96 Amey Narkhede      2021-06-07  5134   * The ordering for functions in pci_reset_fn_methods is required for
c09bbd373f3e96 Amey Narkhede      2021-06-07  5135   * reset_methods byte array defined in struct pci_dev.
c09bbd373f3e96 Amey Narkhede      2021-06-07  5136   */
c09bbd373f3e96 Amey Narkhede      2021-06-07  5137  const struct pci_reset_fn_method pci_reset_fn_methods[] = {
c09bbd373f3e96 Amey Narkhede      2021-06-07  5138  	{ &pci_dev_specific_reset, .name = "device_specific" },
ccbe2295e8be73 Shanker Donthineni 2021-06-07 @5139  	{ &pci_dev_acpi_reset, .name = "acpi" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5140  	{ &pcie_reset_flr, .name = "flr" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5141  	{ &pci_af_flr, .name = "af_flr" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5142  	{ &pci_pm_reset, .name = "pm" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5143  	{ &pci_reset_bus_function, .name = "bus" },
c09bbd373f3e96 Amey Narkhede      2021-06-07  5144  };
c09bbd373f3e96 Amey Narkhede      2021-06-07  5145  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 36844 bytes --]

^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions
  2021-06-07 18:21 ` [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions Amey Narkhede
  2021-06-07 22:58     ` kernel test robot
@ 2021-06-08  0:44   ` Shanker R Donthineni
  1 sibling, 0 replies; 12+ messages in thread
From: Shanker R Donthineni @ 2021-06-08  0:44 UTC (permalink / raw)
  To: Amey Narkhede, Bjorn Helgaas
  Cc: alex.williamson, Raphael Norwitz, linux-pci, linux-kernel, kw,
	Sinan Kaya

Hi Amey,

On 6/7/21 1:21 PM, Amey Narkhede wrote:
>  int pci_acpi_program_hp_params(struct pci_dev *dev);
>  extern const struct attribute_group pci_dev_acpi_attr_group;
>  void pci_set_acpi_fwnode(struct pci_dev *dev);
> -int pci_dev_acpi_reset(struct pci_dev *dev, int probe);
> +int pci_dev_acpi_reset(struct pci_dev *dev, pci_reset_mode_t mode);
>  #else
>  static inline int pci_dev_acpi_reset(struct pci_dev *dev, int probe)
>  {
Prototype mismatch, build kernel with CONFIG_ACPI=n to catch this issue.

^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2021-06-08  0:45 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-07 18:21 [PATCH v6 0/8] Expose and manage PCI device reset Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 1/8] PCI: Add pcie_reset_flr to follow calling convention of other reset methods Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 2/8] PCI: Add new array for keeping track of ordering of " Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 3/8] PCI: Remove reset_fn field from pci_dev Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 4/8] PCI/sysfs: Allow userspace to query and set device reset mechanism Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 5/8] PCI: Setup ACPI_COMPANION early Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 6/8] PCI: Add support for ACPI _RST reset method Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 7/8] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs Amey Narkhede
2021-06-07 18:21 ` [PATCH v6 8/8] PCI: Change the type of probe argument in reset functions Amey Narkhede
2021-06-07 22:58   ` kernel test robot
2021-06-07 22:58     ` kernel test robot
2021-06-08  0:44   ` Shanker R Donthineni

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