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authorLinus Torvalds <torvalds@linux-foundation.org>2009-06-22 21:38:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-22 21:38:22 -0700
commit687d680985b1438360a9ba470ece8b57cd205c3b (patch)
treeae253608531e5c3e823600974c610e722e7de759 /drivers/pci/iov.c
parent1053414068bad659479e6efa62a67403b8b1ec0a (diff)
parent008fe148cb0fb51d266baabe2c09997b21cf90c6 (diff)
Merge git://git.infradead.org/~dwmw2/iommu-2.6.31
* git://git.infradead.org/~dwmw2/iommu-2.6.31: intel-iommu: Fix one last ia64 build problem in Pass Through Support VT-d: support the device IOTLB VT-d: cleanup iommu_flush_iotlb_psi and flush_unmaps VT-d: add device IOTLB invalidation support VT-d: parse ATSR in DMA Remapping Reporting Structure PCI: handle Virtual Function ATS enabling PCI: support the ATS capability intel-iommu: dmar_set_interrupt return error value intel-iommu: Tidy up iommu->gcmd handling intel-iommu: Fix tiny theoretical race in write-buffer flush. intel-iommu: Clean up handling of "caching mode" vs. IOTLB flushing. intel-iommu: Clean up handling of "caching mode" vs. context flushing. VT-d: fix invalid domain id for KVM context flush Fix !CONFIG_DMAR build failure introduced by Intel IOMMU Pass Through Support Intel IOMMU Pass Through Support Fix up trivial conflicts in drivers/pci/{intel-iommu.c,intr_remapping.c}
Diffstat (limited to 'drivers/pci/iov.c')
-rw-r--r--drivers/pci/iov.c155
1 files changed, 149 insertions, 6 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 03c7706c0a09..e3a87210e947 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -5,6 +5,7 @@
*
* PCI Express I/O Virtualization (IOV) support.
* Single Root IOV 1.0
+ * Address Translation Service 1.0
*/
#include <linux/pci.h>
@@ -492,10 +493,10 @@ found:
if (pdev)
iov->dev = pci_dev_get(pdev);
- else {
+ else
iov->dev = dev;
- mutex_init(&iov->lock);
- }
+
+ mutex_init(&iov->lock);
dev->sriov = iov;
dev->is_physfn = 1;
@@ -515,11 +516,11 @@ static void sriov_release(struct pci_dev *dev)
{
BUG_ON(dev->sriov->nr_virtfn);
- if (dev == dev->sriov->dev)
- mutex_destroy(&dev->sriov->lock);
- else
+ if (dev != dev->sriov->dev)
pci_dev_put(dev->sriov->dev);
+ mutex_destroy(&dev->sriov->lock);
+
kfree(dev->sriov);
dev->sriov = NULL;
}
@@ -681,3 +682,145 @@ irqreturn_t pci_sriov_migration(struct pci_dev *dev)
return sriov_migration(dev) ? IRQ_HANDLED : IRQ_NONE;
}
EXPORT_SYMBOL_GPL(pci_sriov_migration);
+
+static int ats_alloc_one(struct pci_dev *dev, int ps)
+{
+ int pos;
+ u16 cap;
+ struct pci_ats *ats;
+
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
+ if (!pos)
+ return -ENODEV;
+
+ ats = kzalloc(sizeof(*ats), GFP_KERNEL);
+ if (!ats)
+ return -ENOMEM;
+
+ 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)
+{
+ kfree(dev->ats);
+ dev->ats = NULL;
+}
+
+/**
+ * pci_enable_ats - enable the ATS capability
+ * @dev: the PCI device
+ * @ps: the IOMMU page shift
+ *
+ * Returns 0 on success, or negative on failure.
+ */
+int pci_enable_ats(struct pci_dev *dev, int ps)
+{
+ int rc;
+ u16 ctrl;
+
+ BUG_ON(dev->ats && dev->ats->is_enabled);
+
+ 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;
+
+ mutex_lock(&pdev->sriov->lock);
+ if (pdev->ats)
+ rc = pdev->ats->stu == ps ? 0 : -EINVAL;
+ else
+ rc = ats_alloc_one(pdev, ps);
+
+ 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;
+ }
+
+ 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;
+}
+
+/**
+ * pci_disable_ats - disable the ATS capability
+ * @dev: the PCI device
+ */
+void pci_disable_ats(struct pci_dev *dev)
+{
+ u16 ctrl;
+
+ BUG_ON(!dev->ats || !dev->ats->is_enabled);
+
+ 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);
+}
+
+/**
+ * pci_ats_queue_depth - query the ATS Invalidate Queue Depth
+ * @dev: the PCI device
+ *
+ * Returns the queue depth on success, or negative on failure.
+ *
+ * The ATS spec uses 0 in the Invalidate Queue Depth field to
+ * indicate that the function can accept 32 Invalidate Request.
+ * But here we use the `real' values (i.e. 1~32) for the Queue
+ * Depth; and 0 indicates the function shares the Queue with
+ * other functions (doesn't exclusively own a Queue).
+ */
+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;
+}