PCI: Allocate ATS struct during enumeration

Previously, we allocated pci_ats structures when an IOMMU driver called
pci_enable_ats().  An SR-IOV VF shares the STU setting with its PF, so when
enabling ATS on the VF, we allocated a pci_ats struct for the PF if it
didn't already have one.  We held the sriov->lock to serialize threads
concurrently enabling ATS on several VFS so only one would allocate the PF
pci_ats.

Gregor reported a deadlock here:

  pci_enable_sriov
    sriov_enable
      virtfn_add
        mutex_lock(dev->sriov->lock)      # acquire sriov->lock
        pci_device_add
          device_add
            BUS_NOTIFY_ADD_DEVICE notifier chain
            iommu_bus_notifier
              amd_iommu_add_device        # iommu_ops.add_device
                init_iommu_group
                  iommu_group_get_for_dev
                    iommu_group_add_device
                      __iommu_attach_device
                        amd_iommu_attach_device  # iommu_ops.attach_device
                          attach_device
                            pci_enable_ats
                              mutex_lock(dev->sriov->lock) # deadlock

There's no reason to delay allocating the pci_ats struct, and if we
allocate it for each device at enumeration-time, there's no need for
locking in pci_enable_ats().

Allocate pci_ats struct during enumeration, when we initialize other
capabilities.

Note that this implementation requires ATS to be enabled on the PF first,
before on any of the VFs because the PF controls the STU for all the VFs.

Link: http://permalink.gmane.org/gmane.linux.kernel.iommu/9433
Reported-by: Gregor Dick <gdick@solarflare.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 42 insertions, 56 deletions

diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index a8099d4d0c9d..2026f5388796 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -17,7 +17,7 @@
 
 #include "pci.h"
 
-static int ats_alloc_one(struct pci_dev *dev, int ps)
+static void ats_alloc_one(struct pci_dev *dev)
 {
 	int pos;
 	u16 cap;
@@ -25,20 +25,19 @@ static int ats_alloc_one(struct pci_dev *dev, int ps)
 
 	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
 	if (!pos)
-		return -ENODEV;
+		return;
 
 	ats = kzalloc(sizeof(*ats), GFP_KERNEL);
-	if (!ats)
-		return -ENOMEM;
+	if (!ats) {
+		dev_warn(&dev->dev, "can't allocate space for ATS state\n");
+		return;
+	}
 
 	ats->pos = pos;
-	ats->stu = ps;
 	pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
 	ats->qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
 					    PCI_ATS_MAX_QDEP;
 	dev->ats = ats;
-
-	return 0;
 }
 
 static void ats_free_one(struct pci_dev *dev)
@@ -47,6 +46,16 @@ static void ats_free_one(struct pci_dev *dev)
 	dev->ats = NULL;
 }
 
+void pci_ats_init(struct pci_dev *dev)
+{
+	ats_alloc_one(dev);
+}
+
+void pci_ats_free(struct pci_dev *dev)
+{
+	ats_free_one(dev);
+}
+
 /**
  * pci_enable_ats - enable the ATS capability
  * @dev: the PCI device
@@ -56,43 +65,35 @@ static void ats_free_one(struct pci_dev *dev)
  */
 int pci_enable_ats(struct pci_dev *dev, int ps)
 {
-	int rc;
 	u16 ctrl;
 
 	BUG_ON(dev->ats && dev->ats->is_enabled);
 
+	if (!dev->ats)
+		return -EINVAL;
+
 	if (ps < PCI_ATS_MIN_STU)
 		return -EINVAL;
 
-	if (dev->is_physfn || dev->is_virtfn) {
-		struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
+	/*
+	 * Note that enabling ATS on a VF fails unless it's already enabled
+	 * with the same STU on the PF.
+	 */
+	ctrl = PCI_ATS_CTRL_ENABLE;
+	if (dev->is_virtfn) {
+		struct pci_dev *pdev = dev->physfn;
 
-		mutex_lock(&pdev->sriov->lock);
-		if (pdev->ats)
-			rc = pdev->ats->stu == ps ? 0 : -EINVAL;
-		else
-			rc = ats_alloc_one(pdev, ps);
+		if (pdev->ats->stu != ps)
+			return -EINVAL;
 
-		if (!rc)
-			pdev->ats->ref_cnt++;
-		mutex_unlock(&pdev->sriov->lock);
-		if (rc)
-			return rc;
-	}
-
-	if (!dev->is_physfn) {
-		rc = ats_alloc_one(dev, ps);
-		if (rc)
-			return rc;
+		atomic_inc(&pdev->ats->ref_cnt);  /* count enabled VFs */
+	} else {
+		dev->ats->stu = ps;
+		ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
 	}
-
-	ctrl = PCI_ATS_CTRL_ENABLE;
-	if (!dev->is_virtfn)
-		ctrl |= PCI_ATS_CTRL_STU(ps - PCI_ATS_MIN_STU);
 	pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
 
 	dev->ats->is_enabled = 1;
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_enable_ats);
@@ -107,24 +108,20 @@ void pci_disable_ats(struct pci_dev *dev)
 
 	BUG_ON(!dev->ats || !dev->ats->is_enabled);
 
+	if (atomic_read(&dev->ats->ref_cnt))
+		return;		/* VFs still enabled */
+
+	if (dev->is_virtfn) {
+		struct pci_dev *pdev = dev->physfn;
+
+		atomic_dec(&pdev->ats->ref_cnt);
+	}
+
 	pci_read_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, &ctrl);
 	ctrl &= ~PCI_ATS_CTRL_ENABLE;
 	pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
 
 	dev->ats->is_enabled = 0;
-
-	if (dev->is_physfn || dev->is_virtfn) {
-		struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
-
-		mutex_lock(&pdev->sriov->lock);
-		pdev->ats->ref_cnt--;
-		if (!pdev->ats->ref_cnt)
-			ats_free_one(pdev);
-		mutex_unlock(&pdev->sriov->lock);
-	}
-
-	if (!dev->is_physfn)
-		ats_free_one(dev);
 }
 EXPORT_SYMBOL_GPL(pci_disable_ats);
 
@@ -140,7 +137,6 @@ void pci_restore_ats_state(struct pci_dev *dev)
 	ctrl = PCI_ATS_CTRL_ENABLE;
 	if (!dev->is_virtfn)
 		ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
-
 	pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
 }
 EXPORT_SYMBOL_GPL(pci_restore_ats_state);
@@ -159,23 +155,13 @@ EXPORT_SYMBOL_GPL(pci_restore_ats_state);
  */
 int pci_ats_queue_depth(struct pci_dev *dev)
 {
-	int pos;
-	u16 cap;
-
 	if (dev->is_virtfn)
 		return 0;
 
 	if (dev->ats)
 		return dev->ats->qdep;
 
-	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
-	if (!pos)
-		return -ENODEV;
-
-	pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
-
-	return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
-				       PCI_ATS_MAX_QDEP;
+	return -ENODEV;
 }
 EXPORT_SYMBOL_GPL(pci_ats_queue_depth);