[Patch Part3 V3 21/21] pci, ACPI, iommu: enhance pci_root to support DMAR device hotplug

[Jiang Liu]

Finally enhance pci_root driver to support DMAR device hotplug when
hot-plugging PCI host bridges.

Signed-off-by: Jiang Liu <jiang....@linux.intel.com>
---
 drivers/acpi/pci_root.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index d388f13d48b4..99c2b9761c12 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -33,6 +33,7 @@
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>
 #include <linux/pci-aspm.h>
+#include <linux/dmar.h>
 #include <linux/acpi.h>
 #include <linux/slab.h>
 #include <acpi/apei.h> /* for acpi_hest_init() */
@@ -511,6 +512,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
        struct acpi_pci_root *root;
        acpi_handle handle = device->handle;
        int no_aspm = 0, clear_aspm = 0;
+       bool hotadd = system_state != SYSTEM_BOOTING;
 
        root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
        if (!root)
@@ -557,6 +559,11 @@ static int acpi_pci_root_add(struct acpi_device *device,
        strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
        device->driver_data = root;
 
+       if (hotadd && dmar_device_add(handle)) {
+               result = -ENXIO;
+               goto end;
+       }
+
        pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
               acpi_device_name(device), acpi_device_bid(device),
               root->segment, &root->secondary);
@@ -583,7 +590,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
                        root->segment, (unsigned int)root->secondary.start);
                device->driver_data = NULL;
                result = -ENODEV;
-               goto end;
+               goto remove_dmar;
        }
 
        if (clear_aspm) {
@@ -597,7 +604,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
        if (device->wakeup.flags.run_wake)
                device_set_run_wake(root->bus->bridge, true);
 
-       if (system_state != SYSTEM_BOOTING) {
+       if (hotadd) {
                pcibios_resource_survey_bus(root->bus);
                pci_assign_unassigned_root_bus_resources(root->bus);
        }
@@ -607,6 +614,9 @@ static int acpi_pci_root_add(struct acpi_device *device,
        pci_unlock_rescan_remove();
        return 1;
 
+remove_dmar:
+       if (hotadd)
+               dmar_device_remove(handle);
 end:
        kfree(root);
        return result;
@@ -625,6 +635,8 @@ static void acpi_pci_root_remove(struct acpi_device *device)
 
        pci_remove_root_bus(root->bus);
 
+       dmar_device_remove(device->handle);
+
        pci_unlock_rescan_remove();
 
        kfree(root);
-- 
1.7.10.4

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