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SubjectRe: [PATCH v2 06/29] x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus()
On 10/13/2011 09:27 PM, Bjorn Helgaas wrote:

> 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@oracle.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.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);
> }


You may need to update get_current_resources() to return status about handling _CRS...
and check that status insteaf of !pci_use_crs.

Thanks


> + 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;
> }
>


well, that will break
arch/x86/pci/broadcom_bus.c

it is using

DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_LE,
cnb20le_res);


to fill pci_root_info...

need to update it to fill that array early.


amd_bus.c is using
postcore_initcall(amd_postcore_init);

and my local intel_bus.c is using

/*
* need to call it just after pci_arch_init
* so we can have mmconf ready
*/
int __init intel_postarch_init(void)
{
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return 0;
if (!pci_ext_cfg_avail(NULL))
return 0;
postarch_check_pci_devs();

return 0;
}
so they are ok.

Thanks

Yinghai Lu


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