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Date: Thu, 13 Oct 2011 22:27:37 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: linux-pci@...r.kernel.org
Cc: linux-arch@...r.kernel.org, Yinghai Lu <yinghai.lu@...cle.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 06/29] 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() because
ACPI hotplug needed to split the pci_bus_add_devices() into a separate
.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@...cle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
arch/x86/include/asm/topology.h | 2 +-
arch/x86/pci/acpi.c | 31 +++++++++++++++++--------------
arch/x86/pci/bus_numa.c | 31 ++++++++++++++++++-------------
arch/x86/pci/common.c | 21 ++++++++++++++-------
4 files changed, 50 insertions(+), 35 deletions(-)
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index c006924..5f83b13 100644
--- 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 039d913..77bb332 100644
--- 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;
};
@@ -250,23 +250,20 @@ 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)
@@ -275,7 +272,7 @@ 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)
@@ -290,8 +287,6 @@ 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)
@@ -299,6 +294,7 @@ 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;
+ struct list_head resources;
struct pci_bus *bus;
struct pci_sysdata *sd;
int node;
@@ -353,11 +349,18 @@ 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);
- bus->subordinate = pci_scan_child_bus(bus);
+ INIT_LIST_HEAD(&resources);
+ get_current_resources(device, busnum, domain, &resources);
+ if (!pci_use_crs) {
+ pci_free_resource_list(&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
--- 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 b389a2d..7f595cc 100644
--- 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)
{
+ struct list_head resources;
struct pci_bus *bus = NULL;
struct pci_sysdata *sd;
@@ -456,9 +454,13 @@ 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)
+ INIT_LIST_HEAD(&resources);
+ 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 +641,7 @@ 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)
{
+ struct list_head resources;
struct pci_bus *bus = NULL;
struct pci_sysdata *sd;
@@ -653,9 +656,13 @@ 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)
+ INIT_LIST_HEAD(&resources);
+ 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;
}
--
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