x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus()

x86 has two kinds of PCI root bus scanning:

(1) ACPI-based, using _CRS resources.  This used pci_create_bus(), not
    pci_scan_bus(), because ACPI hotplug needed to split the
    pci_bus_add_devices() into a separate host bridge .start() method.

    This patch parses the _CRS resources earlier, so we can build a list of
    resources and pass it to pci_create_root_bus().

    Note that as before, we parse the _CRS even if we aren't going to use
    it so we can print it for debugging purposes.

(2) All other, which used either default resources (ioport_resource and
    iomem_resource) or information read from the hardware via amd_bus.c or
    similar.  This used pci_scan_bus().

    This patch converts x86_pci_root_bus_res_quirks() (previously called
    from pcibios_fixup_bus()) to x86_pci_root_bus_resources(), which builds
    a list of resources before we call pci_scan_root_bus().

    We also use x86_pci_root_bus_resources() if we have ACPI but are
    ignoring _CRS.

CC: Yinghai Lu <yinghai.lu@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index c006924..5f83b13 100644 (file)
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -174,7 +174,7 @@ static inline void arch_fix_phys_package_id(int num, u32 slot)
 }
 
 struct pci_bus;
-void x86_pci_root_bus_res_quirks(struct pci_bus *b);
+void x86_pci_root_bus_resources(int bus, struct list_head *resources);
 
 #ifdef CONFIG_SMP
 #define mc_capable()   ((boot_cpu_data.x86_max_cores > 1) && \

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 425500b..a312e76 100644 (file)
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -12,7 +12,7 @@ struct pci_root_info {
        char *name;
        unsigned int res_num;
        struct resource *res;
-       struct pci_bus *bus;
+       struct list_head *resources;
        int busnum;
 };
 
@@ -304,23 +304,20 @@ static void add_resources(struct pci_root_info *info)
                                 "ignoring host bridge window %pR (conflicts with %s %pR)\n",
                                 res, conflict->name, conflict);
                else
-                       pci_bus_add_resource(info->bus, res, 0);
+                       pci_add_resource(info->resources, res);
        }
 }
 
 static void
 get_current_resources(struct acpi_device *device, int busnum,
-                       int domain, struct pci_bus *bus)
+                     int domain, struct list_head *resources)
 {
        struct pci_root_info info;
        size_t size;
 
-       if (pci_use_crs)
-               pci_bus_remove_resources(bus);
-
        info.bridge = device;
-       info.bus = bus;
        info.res_num = 0;
+       info.resources = resources;
        acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
                                &info);
        if (!info.res_num)
@@ -329,7 +326,7 @@ get_current_resources(struct acpi_device *device, int busnum,
        size = sizeof(*info.res) * info.res_num;
        info.res = kmalloc(size, GFP_KERNEL);
        if (!info.res)
-               goto res_alloc_fail;
+               return;
 
        info.name = kasprintf(GFP_KERNEL, "PCI Bus %04x:%02x", domain, busnum);
        if (!info.name)
@@ -344,8 +341,6 @@ get_current_resources(struct acpi_device *device, int busnum,
 
 name_alloc_fail:
        kfree(info.res);
-res_alloc_fail:
-       return;
 }
 
 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
@@ -353,6 +348,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
        struct acpi_device *device = root->device;
        int domain = root->segment;
        int busnum = root->secondary.start;
+       LIST_HEAD(resources);
        struct pci_bus *bus;
        struct pci_sysdata *sd;
        int node;
@@ -407,11 +403,15 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_pci_root *root)
                memcpy(bus->sysdata, sd, sizeof(*sd));
                kfree(sd);
        } else {
-               bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
-               if (bus) {
-                       get_current_resources(device, busnum, domain, bus);
+               get_current_resources(device, busnum, domain, &resources);
+               if (list_empty(&resources))
+                       x86_pci_root_bus_resources(busnum, &resources);
+               bus = pci_create_root_bus(NULL, busnum, &pci_root_ops, sd,
+                                         &resources);
+               if (bus)
                        bus->subordinate = pci_scan_child_bus(bus);
-               }
+               else
+                       pci_free_resource_list(&resources);
        }
 
        /* After the PCI-E bus has been walked and all devices discovered,

diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
index 64a1228..fd3f655 100644 (file)
--- a/arch/x86/pci/bus_numa.c
+++ b/arch/x86/pci/bus_numa.c
@@ -7,45 +7,50 @@
 int pci_root_num;
 struct pci_root_info pci_root_info[PCI_ROOT_NR];
 
-void x86_pci_root_bus_res_quirks(struct pci_bus *b)
+void x86_pci_root_bus_resources(int bus, struct list_head *resources)
 {
        int i;
        int j;
        struct pci_root_info *info;
 
-       /* don't go for it if _CRS is used already */
-       if (b->resource[0] != &ioport_resource ||
-           b->resource[1] != &iomem_resource)
-               return;
-
        if (!pci_root_num)
-               return;
+               goto default_resources;
 
        for (i = 0; i < pci_root_num; i++) {
-               if (pci_root_info[i].bus_min == b->number)
+               if (pci_root_info[i].bus_min == bus)
                        break;
        }
 
        if (i == pci_root_num)
-               return;
+               goto default_resources;
 
-       printk(KERN_DEBUG "PCI: peer root bus %02x res updated from pci conf\n",
-                       b->number);
+       printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
+              bus);
 
-       pci_bus_remove_resources(b);
        info = &pci_root_info[i];
        for (j = 0; j < info->res_num; j++) {
                struct resource *res;
                struct resource *root;
 
                res = &info->res[j];
-               pci_bus_add_resource(b, res, 0);
+               pci_add_resource(resources, res);
                if (res->flags & IORESOURCE_IO)
                        root = &ioport_resource;
                else
                        root = &iomem_resource;
                insert_resource(root, res);
        }
+       return;
+
+default_resources:
+       /*
+        * We don't have any host bridge aperture information from the
+        * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
+        * so fall back to the defaults historically used by pci_create_bus().
+        */
+       printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
+       pci_add_resource(resources, &ioport_resource);
+       pci_add_resource(resources, &iomem_resource);
 }
 
 void __devinit update_res(struct pci_root_info *info, resource_size_t start,

diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 07c55ce..323481e 100644 (file)
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -164,9 +164,6 @@ void __devinit pcibios_fixup_bus(struct pci_bus *b)
 {
        struct pci_dev *dev;
 
-       /* root bus? */
-       if (!b->parent)
-               x86_pci_root_bus_res_quirks(b);
        pci_read_bridge_bases(b);
        list_for_each_entry(dev, &b->devices, bus_list)
                pcibios_fixup_device_resources(dev);
@@ -433,6 +430,7 @@ void __init dmi_check_pciprobe(void)
 
 struct pci_bus * __devinit pcibios_scan_root(int busnum)
 {
+       LIST_HEAD(resources);
        struct pci_bus *bus = NULL;
        struct pci_sysdata *sd;
 
@@ -456,9 +454,12 @@ struct pci_bus * __devinit pcibios_scan_root(int busnum)
        sd->node = get_mp_bus_to_node(busnum);
 
        printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
-       bus = pci_scan_bus(busnum, &pci_root_ops, sd);
-       if (!bus)
+       x86_pci_root_bus_resources(busnum, &resources);
+       bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
+       if (!bus) {
+               pci_free_resource_list(&resources);
                kfree(sd);
+       }
 
        return bus;
 }
@@ -639,6 +640,7 @@ int pci_ext_cfg_avail(struct pci_dev *dev)
 
 struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 {
+       LIST_HEAD(resources);
        struct pci_bus *bus = NULL;
        struct pci_sysdata *sd;
 
@@ -653,9 +655,12 @@ struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops,
                return NULL;
        }
        sd->node = node;
-       bus = pci_scan_bus(busno, ops, sd);
-       if (!bus)
+       x86_pci_root_bus_resources(busno, &resources);
+       bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
+       if (!bus) {
+               pci_free_resource_list(&resources);
                kfree(sd);
+       }
 
        return bus;
 }