Merge branch 'pci/virtualization' into next

* pci/virtualization:
  PCI: Lock each enable/disable num_vfs operation in sysfs
  PCI: Add ACS quirk for Intel Union Point

drivers/pci/iov.c

@@ -124,7 +124,6 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
 	struct pci_sriov *iov = dev->sriov;
 	struct pci_bus *bus;
 
-	mutex_lock(&iov->dev->sriov->lock);
 	bus = virtfn_add_bus(dev->bus, pci_iov_virtfn_bus(dev, id));
 	if (!bus)
 		goto failed;
@@ -162,7 +161,6 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
 		__pci_reset_function(virtfn);
 
 	pci_device_add(virtfn, virtfn->bus);
-	mutex_unlock(&iov->dev->sriov->lock);
 
 	pci_bus_add_device(virtfn);
 	sprintf(buf, "virtfn%u", id);
@@ -181,12 +179,10 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id, int reset)
 	sysfs_remove_link(&dev->dev.kobj, buf);
 failed1:
 	pci_dev_put(dev);
-	mutex_lock(&iov->dev->sriov->lock);
 	pci_stop_and_remove_bus_device(virtfn);
 failed0:
 	virtfn_remove_bus(dev->bus, bus);
 failed:
-	mutex_unlock(&iov->dev->sriov->lock);
 
 	return rc;
 }
@@ -195,7 +191,6 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset)
 {
 	char buf[VIRTFN_ID_LEN];
 	struct pci_dev *virtfn;
-	struct pci_sriov *iov = dev->sriov;
 
 	virtfn = pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
 					     pci_iov_virtfn_bus(dev, id),
@@ -218,10 +213,8 @@ void pci_iov_remove_virtfn(struct pci_dev *dev, int id, int reset)
 	if (virtfn->dev.kobj.sd)
 		sysfs_remove_link(&virtfn->dev.kobj, "physfn");
 
-	mutex_lock(&iov->dev->sriov->lock);
 	pci_stop_and_remove_bus_device(virtfn);
 	virtfn_remove_bus(dev->bus, virtfn->bus);
-	mutex_unlock(&iov->dev->sriov->lock);
 
 	/* balance pci_get_domain_bus_and_slot() */
 	pci_dev_put(virtfn);

drivers/pci/pci-sysfs.c

@@ -472,6 +472,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 				  const char *buf, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_sriov *iov = pdev->sriov;
 	int ret;
 	u16 num_vfs;
 
@@ -482,38 +483,46 @@ static ssize_t sriov_numvfs_store(struct device *dev,
 	if (num_vfs > pci_sriov_get_totalvfs(pdev))
 		return -ERANGE;
 
+	mutex_lock(&iov->dev->sriov->lock);
+
 	if (num_vfs == pdev->sriov->num_VFs)
-		return count;		/* no change */
+		goto exit;
 
 	/* is PF driver loaded w/callback */
 	if (!pdev->driver || !pdev->driver->sriov_configure) {
 		dev_info(&pdev->dev, "Driver doesn't support SRIOV configuration via sysfs\n");
-		return -ENOSYS;
+		ret = -ENOENT;
+		goto exit;
 	}
 
 	if (num_vfs == 0) {
 		/* disable VFs */
 		ret = pdev->driver->sriov_configure(pdev, 0);
-		if (ret < 0)
-			return ret;
-		return count;
+		goto exit;
 	}
 
 	/* enable VFs */
 	if (pdev->sriov->num_VFs) {
 		dev_warn(&pdev->dev, "%d VFs already enabled. Disable before enabling %d VFs\n",
 			 pdev->sriov->num_VFs, num_vfs);
-		return -EBUSY;
+		ret = -EBUSY;
+		goto exit;
 	}
 
 	ret = pdev->driver->sriov_configure(pdev, num_vfs);
 	if (ret < 0)
-		return ret;
+		goto exit;
 
 	if (ret != num_vfs)
 		dev_warn(&pdev->dev, "%d VFs requested; only %d enabled\n",
 			 num_vfs, ret);
 
+exit:
+	mutex_unlock(&iov->dev->sriov->lock);
+
+	if (ret < 0)
+		return ret;
+
 	return count;
 }
 

drivers/pci/pci.h

@@ -270,7 +270,7 @@ struct pci_sriov {
 	u16 driver_max_VFs;	/* max num VFs driver supports */
 	struct pci_dev *dev;	/* lowest numbered PF */
 	struct pci_dev *self;	/* this PF */
-	struct mutex lock;	/* lock for VF bus */
+	struct mutex lock;	/* lock for setting sriov_numvfs in sysfs */
 	resource_size_t barsz[PCI_SRIOV_NUM_BARS];	/* VF BAR size */
 };
 

drivers/pci/quirks.c

@@ -4150,15 +4150,35 @@ static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags)
  *
  * N.B. This doesn't fix what lspci shows.
  *
+ * The 100 series chipset specification update includes this as errata #23[3].
+ *
+ * The 200 series chipset (Union Point) has the same bug according to the
+ * specification update (Intel 200 Series Chipset Family Platform Controller
+ * Hub, Specification Update, January 2017, Revision 001, Document# 335194-001,
+ * Errata 22)[4].  Per the datasheet[5], root port PCI Device IDs for this
+ * chipset include:
+ *
+ * 0xa290-0xa29f PCI Express Root port #{0-16}
+ * 0xa2e7-0xa2ee PCI Express Root port #{17-24}
+ *
  * [1] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-datasheet-vol-2.html
  * [2] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-datasheet-vol-1.html
+ * [3] http://www.intel.com/content/www/us/en/chipsets/100-series-chipset-spec-update.html
+ * [4] http://www.intel.com/content/www/us/en/chipsets/200-series-chipset-pch-spec-update.html
+ * [5] http://www.intel.com/content/www/us/en/chipsets/200-series-chipset-pch-datasheet-vol-1.html
  */
 static bool pci_quirk_intel_spt_pch_acs_match(struct pci_dev *dev)
 {
-	return pci_is_pcie(dev) &&
-		pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT &&
-		((dev->device & ~0xf) == 0xa110 ||
-		 (dev->device >= 0xa167 && dev->device <= 0xa16a));
+	if (!pci_is_pcie(dev) || pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
+		return false;
+
+	switch (dev->device) {
+	case 0xa110 ... 0xa11f: case 0xa167 ... 0xa16a: /* Sunrise Point */
+	case 0xa290 ... 0xa29f: case 0xa2e7 ... 0xa2ee: /* Union Point */
+		return true;
+	}
+
+	return false;
 }
 
 #define INTEL_SPT_ACS_CTRL (PCI_ACS_CAP + 4)