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Diffstat (limited to 'drivers/pci/controller/vmd.c')
-rw-r--r--drivers/pci/controller/vmd.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index e3fcdfec58b3..a5987e52700e 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/pci.h>
+#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
#include <linux/srcu.h>
#include <linux/rculist.h>
@@ -447,6 +448,56 @@ static struct pci_ops vmd_ops = {
.write = vmd_pci_write,
};
+#ifdef CONFIG_ACPI
+static struct acpi_device *vmd_acpi_find_companion(struct pci_dev *pci_dev)
+{
+ struct pci_host_bridge *bridge;
+ u32 busnr, addr;
+
+ if (pci_dev->bus->ops != &vmd_ops)
+ return NULL;
+
+ bridge = pci_find_host_bridge(pci_dev->bus);
+ busnr = pci_dev->bus->number - bridge->bus->number;
+ /*
+ * The address computation below is only applicable to relative bus
+ * numbers below 32.
+ */
+ if (busnr > 31)
+ return NULL;
+
+ addr = (busnr << 24) | ((u32)pci_dev->devfn << 16) | 0x8000FFFFU;
+
+ dev_dbg(&pci_dev->dev, "Looking for ACPI companion (address 0x%x)\n",
+ addr);
+
+ return acpi_find_child_device(ACPI_COMPANION(bridge->dev.parent), addr,
+ false);
+}
+
+static bool hook_installed;
+
+static void vmd_acpi_begin(void)
+{
+ if (pci_acpi_set_companion_lookup_hook(vmd_acpi_find_companion))
+ return;
+
+ hook_installed = true;
+}
+
+static void vmd_acpi_end(void)
+{
+ if (!hook_installed)
+ return;
+
+ pci_acpi_clear_companion_lookup_hook();
+ hook_installed = false;
+}
+#else
+static inline void vmd_acpi_begin(void) { }
+static inline void vmd_acpi_end(void) { }
+#endif /* CONFIG_ACPI */
+
static void vmd_attach_resources(struct vmd_dev *vmd)
{
vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
@@ -747,6 +798,8 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
if (vmd->irq_domain)
dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
+ vmd_acpi_begin();
+
pci_scan_child_bus(vmd->bus);
pci_assign_unassigned_bus_resources(vmd->bus);
@@ -760,6 +813,8 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
pci_bus_add_devices(vmd->bus);
+ vmd_acpi_end();
+
WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
"domain"), "Can't create symlink to domain\n");
return 0;