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path: root/drivers/pci/host/vmd.c
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Diffstat (limited to 'drivers/pci/host/vmd.c')
-rw-r--r--drivers/pci/host/vmd.c91
1 files changed, 81 insertions, 10 deletions
diff --git a/drivers/pci/host/vmd.c b/drivers/pci/host/vmd.c
index 930a8fa08bd6..942b64fc7f1f 100644
--- a/drivers/pci/host/vmd.c
+++ b/drivers/pci/host/vmd.c
@@ -24,6 +24,28 @@
#define VMD_MEMBAR1 2
#define VMD_MEMBAR2 4
+#define PCI_REG_VMCAP 0x40
+#define BUS_RESTRICT_CAP(vmcap) (vmcap & 0x1)
+#define PCI_REG_VMCONFIG 0x44
+#define BUS_RESTRICT_CFG(vmcfg) ((vmcfg >> 8) & 0x3)
+#define PCI_REG_VMLOCK 0x70
+#define MB2_SHADOW_EN(vmlock) (vmlock & 0x2)
+
+enum vmd_features {
+ /*
+ * Device may contain registers which hint the physical location of the
+ * membars, in order to allow proper address translation during
+ * resource assignment to enable guest virtualization
+ */
+ VMD_FEAT_HAS_MEMBAR_SHADOW = (1 << 0),
+
+ /*
+ * Device may provide root port configuration information which limits
+ * bus numbering
+ */
+ VMD_FEAT_HAS_BUS_RESTRICTIONS = (1 << 1),
+};
+
/*
* Lock for manipulating VMD IRQ lists.
*/
@@ -546,7 +568,7 @@ static int vmd_find_free_domain(void)
return domain + 1;
}
-static int vmd_enable_domain(struct vmd_dev *vmd)
+static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
{
struct pci_sysdata *sd = &vmd->sysdata;
struct fwnode_handle *fn;
@@ -554,12 +576,57 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
u32 upper_bits;
unsigned long flags;
LIST_HEAD(resources);
+ resource_size_t offset[2] = {0};
+ resource_size_t membar2_offset = 0x2000, busn_start = 0;
+
+ /*
+ * Shadow registers may exist in certain VMD device ids which allow
+ * guests to correctly assign host physical addresses to the root ports
+ * and child devices. These registers will either return the host value
+ * or 0, depending on an enable bit in the VMD device.
+ */
+ if (features & VMD_FEAT_HAS_MEMBAR_SHADOW) {
+ u32 vmlock;
+ int ret;
+
+ membar2_offset = 0x2018;
+ ret = pci_read_config_dword(vmd->dev, PCI_REG_VMLOCK, &vmlock);
+ if (ret || vmlock == ~0)
+ return -ENODEV;
+
+ if (MB2_SHADOW_EN(vmlock)) {
+ void __iomem *membar2;
+
+ membar2 = pci_iomap(vmd->dev, VMD_MEMBAR2, 0);
+ if (!membar2)
+ return -ENOMEM;
+ offset[0] = vmd->dev->resource[VMD_MEMBAR1].start -
+ readq(membar2 + 0x2008);
+ offset[1] = vmd->dev->resource[VMD_MEMBAR2].start -
+ readq(membar2 + 0x2010);
+ pci_iounmap(vmd->dev, membar2);
+ }
+ }
+
+ /*
+ * Certain VMD devices may have a root port configuration option which
+ * limits the bus range to between 0-127 or 128-255
+ */
+ if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {
+ u32 vmcap, vmconfig;
+
+ pci_read_config_dword(vmd->dev, PCI_REG_VMCAP, &vmcap);
+ pci_read_config_dword(vmd->dev, PCI_REG_VMCONFIG, &vmconfig);
+ if (BUS_RESTRICT_CAP(vmcap) &&
+ (BUS_RESTRICT_CFG(vmconfig) == 0x1))
+ busn_start = 128;
+ }
res = &vmd->dev->resource[VMD_CFGBAR];
vmd->resources[0] = (struct resource) {
.name = "VMD CFGBAR",
- .start = 0,
- .end = (resource_size(res) >> 20) - 1,
+ .start = busn_start,
+ .end = busn_start + (resource_size(res) >> 20) - 1,
.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
};
@@ -600,7 +667,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
flags &= ~IORESOURCE_MEM_64;
vmd->resources[2] = (struct resource) {
.name = "VMD MEMBAR2",
- .start = res->start + 0x2000,
+ .start = res->start + membar2_offset,
.end = res->end,
.flags = flags,
.parent = res,
@@ -624,10 +691,11 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
return -ENODEV;
pci_add_resource(&resources, &vmd->resources[0]);
- pci_add_resource(&resources, &vmd->resources[1]);
- pci_add_resource(&resources, &vmd->resources[2]);
- vmd->bus = pci_create_root_bus(&vmd->dev->dev, 0, &vmd_ops, sd,
- &resources);
+ pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
+ pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);
+
+ vmd->bus = pci_create_root_bus(&vmd->dev->dev, busn_start, &vmd_ops,
+ sd, &resources);
if (!vmd->bus) {
pci_free_resource_list(&resources);
irq_domain_remove(vmd->irq_domain);
@@ -713,7 +781,7 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
spin_lock_init(&vmd->cfg_lock);
pci_set_drvdata(dev, vmd);
- err = vmd_enable_domain(vmd);
+ err = vmd_enable_domain(vmd, (unsigned long) id->driver_data);
if (err)
return err;
@@ -778,7 +846,10 @@ static int vmd_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
static const struct pci_device_id vmd_ids[] = {
- {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x201d),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),},
+ {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
+ .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
+ VMD_FEAT_HAS_BUS_RESTRICTIONS,},
{0,}
};
MODULE_DEVICE_TABLE(pci, vmd_ids);