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Diffstat (limited to 'arch/x86/pci/vmd.c')
-rw-r--r--arch/x86/pci/vmd.c35
1 files changed, 34 insertions, 1 deletions
diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c
index d57e48016..7792aba26 100644
--- a/arch/x86/pci/vmd.c
+++ b/arch/x86/pci/vmd.c
@@ -503,6 +503,18 @@ static struct pci_ops vmd_ops = {
.write = vmd_pci_write,
};
+static void vmd_attach_resources(struct vmd_dev *vmd)
+{
+ vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
+ vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
+}
+
+static void vmd_detach_resources(struct vmd_dev *vmd)
+{
+ vmd->dev->resource[VMD_MEMBAR1].child = NULL;
+ vmd->dev->resource[VMD_MEMBAR2].child = NULL;
+}
+
/*
* VMD domains start at 0x1000 to not clash with ACPI _SEG domains.
*/
@@ -527,11 +539,28 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
res = &vmd->dev->resource[VMD_CFGBAR];
vmd->resources[0] = (struct resource) {
.name = "VMD CFGBAR",
- .start = res->start,
+ .start = 0,
.end = (resource_size(res) >> 20) - 1,
.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
};
+ /*
+ * If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
+ * put 32-bit resources in the window.
+ *
+ * There's no hardware reason why a 64-bit window *couldn't*
+ * contain a 32-bit resource, but pbus_size_mem() computes the
+ * bridge window size assuming a 64-bit window will contain no
+ * 32-bit resources. __pci_assign_resource() enforces that
+ * artificial restriction to make sure everything will fit.
+ *
+ * The only way we could use a 64-bit non-prefechable MEMBAR is
+ * if its address is <4GB so that we can convert it to a 32-bit
+ * resource. To be visible to the host OS, all VMD endpoints must
+ * be initially configured by platform BIOS, which includes setting
+ * up these resources. We can assume the device is configured
+ * according to the platform needs.
+ */
res = &vmd->dev->resource[VMD_MEMBAR1];
upper_bits = upper_32_bits(res->end);
flags = res->flags & ~IORESOURCE_SIZEALIGN;
@@ -542,6 +571,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
.start = res->start,
.end = res->end,
.flags = flags,
+ .parent = res,
};
res = &vmd->dev->resource[VMD_MEMBAR2];
@@ -554,6 +584,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
.start = res->start + 0x2000,
.end = res->end,
.flags = flags,
+ .parent = res,
};
sd->domain = vmd_find_free_domain();
@@ -578,6 +609,7 @@ static int vmd_enable_domain(struct vmd_dev *vmd)
return -ENODEV;
}
+ vmd_attach_resources(vmd);
vmd_setup_dma_ops(vmd);
dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
pci_rescan_bus(vmd->bus);
@@ -674,6 +706,7 @@ static void vmd_remove(struct pci_dev *dev)
{
struct vmd_dev *vmd = pci_get_drvdata(dev);
+ vmd_detach_resources(vmd);
pci_set_drvdata(dev, NULL);
sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
pci_stop_root_bus(vmd->bus);