236e946b53
This reverts commit 9e9f46c44e.
Quoting from the commit message:
"At this point, it seems to solve more problems than it causes, so let's
try using it by default. It's an easy revert if it ends up causing
trouble."
And guess what? The _CRS code causes trouble.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
275 lines
6.4 KiB
C
275 lines
6.4 KiB
C
#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/dmi.h>
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#include <asm/numa.h>
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#include <asm/pci_x86.h>
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struct pci_root_info {
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char *name;
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unsigned int res_num;
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struct resource *res;
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struct pci_bus *bus;
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int busnum;
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};
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static acpi_status
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resource_to_addr(struct acpi_resource *resource,
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struct acpi_resource_address64 *addr)
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{
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acpi_status status;
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status = acpi_resource_to_address64(resource, addr);
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if (ACPI_SUCCESS(status) &&
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(addr->resource_type == ACPI_MEMORY_RANGE ||
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addr->resource_type == ACPI_IO_RANGE) &&
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addr->address_length > 0 &&
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addr->producer_consumer == ACPI_PRODUCER) {
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return AE_OK;
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}
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return AE_ERROR;
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}
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static acpi_status
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count_resource(struct acpi_resource *acpi_res, void *data)
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{
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struct pci_root_info *info = data;
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struct acpi_resource_address64 addr;
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acpi_status status;
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status = resource_to_addr(acpi_res, &addr);
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if (ACPI_SUCCESS(status))
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info->res_num++;
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return AE_OK;
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}
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static int
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bus_has_transparent_bridge(struct pci_bus *bus)
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{
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struct pci_dev *dev;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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u16 class = dev->class >> 8;
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if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent)
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return true;
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}
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return false;
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}
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static acpi_status
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setup_resource(struct acpi_resource *acpi_res, void *data)
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{
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struct pci_root_info *info = data;
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struct resource *res;
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struct acpi_resource_address64 addr;
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acpi_status status;
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unsigned long flags;
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struct resource *root;
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int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
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status = resource_to_addr(acpi_res, &addr);
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if (!ACPI_SUCCESS(status))
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return AE_OK;
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if (addr.resource_type == ACPI_MEMORY_RANGE) {
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root = &iomem_resource;
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flags = IORESOURCE_MEM;
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if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
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flags |= IORESOURCE_PREFETCH;
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} else if (addr.resource_type == ACPI_IO_RANGE) {
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root = &ioport_resource;
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flags = IORESOURCE_IO;
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} else
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return AE_OK;
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res = &info->res[info->res_num];
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res->name = info->name;
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res->flags = flags;
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res->start = addr.minimum + addr.translation_offset;
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res->end = res->start + addr.address_length - 1;
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res->child = NULL;
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if (bus_has_transparent_bridge(info->bus))
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max_root_bus_resources -= 3;
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if (info->res_num >= max_root_bus_resources) {
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printk(KERN_WARNING "PCI: Failed to allocate 0x%lx-0x%lx "
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"from %s for %s due to _CRS returning more than "
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"%d resource descriptors\n", (unsigned long) res->start,
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(unsigned long) res->end, root->name, info->name,
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max_root_bus_resources);
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info->res_num++;
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return AE_OK;
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}
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if (insert_resource(root, res)) {
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printk(KERN_ERR "PCI: Failed to allocate 0x%lx-0x%lx "
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"from %s for %s\n", (unsigned long) res->start,
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(unsigned long) res->end, root->name, info->name);
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} else {
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info->bus->resource[info->res_num] = res;
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info->res_num++;
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}
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return AE_OK;
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}
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static void
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adjust_transparent_bridge_resources(struct pci_bus *bus)
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{
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struct pci_dev *dev;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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int i;
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u16 class = dev->class >> 8;
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if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent) {
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for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
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dev->subordinate->resource[i] =
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dev->bus->resource[i - 3];
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}
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}
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}
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static void
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get_current_resources(struct acpi_device *device, int busnum,
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int domain, struct pci_bus *bus)
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{
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struct pci_root_info info;
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size_t size;
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info.bus = bus;
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info.res_num = 0;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
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&info);
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if (!info.res_num)
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return;
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size = sizeof(*info.res) * info.res_num;
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info.res = kmalloc(size, GFP_KERNEL);
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if (!info.res)
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goto res_alloc_fail;
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info.name = kmalloc(16, GFP_KERNEL);
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if (!info.name)
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goto name_alloc_fail;
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sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
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info.res_num = 0;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
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&info);
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if (info.res_num)
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adjust_transparent_bridge_resources(bus);
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return;
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name_alloc_fail:
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kfree(info.res);
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res_alloc_fail:
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return;
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}
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struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
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{
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struct pci_bus *bus;
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struct pci_sysdata *sd;
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int node;
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#ifdef CONFIG_ACPI_NUMA
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int pxm;
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#endif
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if (domain && !pci_domains_supported) {
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printk(KERN_WARNING "PCI: Multiple domains not supported "
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"(dom %d, bus %d)\n", domain, busnum);
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return NULL;
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}
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node = -1;
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#ifdef CONFIG_ACPI_NUMA
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pxm = acpi_get_pxm(device->handle);
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if (pxm >= 0)
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node = pxm_to_node(pxm);
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if (node != -1)
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set_mp_bus_to_node(busnum, node);
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else
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#endif
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node = get_mp_bus_to_node(busnum);
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if (node != -1 && !node_online(node))
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node = -1;
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/* Allocate per-root-bus (not per bus) arch-specific data.
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* TODO: leak; this memory is never freed.
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* It's arguable whether it's worth the trouble to care.
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*/
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sd = kzalloc(sizeof(*sd), GFP_KERNEL);
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if (!sd) {
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printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
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return NULL;
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}
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sd->domain = domain;
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sd->node = node;
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/*
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* Maybe the desired pci bus has been already scanned. In such case
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* it is unnecessary to scan the pci bus with the given domain,busnum.
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*/
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bus = pci_find_bus(domain, busnum);
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if (bus) {
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/*
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* If the desired bus exits, the content of bus->sysdata will
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* be replaced by sd.
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*/
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memcpy(bus->sysdata, sd, sizeof(*sd));
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kfree(sd);
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} else
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bus = pci_scan_bus_parented(NULL, busnum, &pci_root_ops, sd);
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if (!bus)
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kfree(sd);
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if (bus && node != -1) {
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#ifdef CONFIG_ACPI_NUMA
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if (pxm >= 0)
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dev_printk(KERN_DEBUG, &bus->dev,
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"on NUMA node %d (pxm %d)\n", node, pxm);
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#else
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dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
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#endif
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}
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if (bus && (pci_probe & PCI_USE__CRS))
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get_current_resources(device, busnum, domain, bus);
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return bus;
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}
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int __init pci_acpi_init(void)
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{
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struct pci_dev *dev = NULL;
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if (pcibios_scanned)
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return 0;
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if (acpi_noirq)
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return 0;
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printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
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acpi_irq_penalty_init();
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pcibios_scanned++;
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pcibios_enable_irq = acpi_pci_irq_enable;
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pcibios_disable_irq = acpi_pci_irq_disable;
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if (pci_routeirq) {
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/*
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* PCI IRQ routing is set up by pci_enable_device(), but we
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* also do it here in case there are still broken drivers that
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* don't use pci_enable_device().
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*/
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printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
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for_each_pci_dev(dev)
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acpi_pci_irq_enable(dev);
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}
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return 0;
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}
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