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https://github.com/torvalds/linux
synced 2024-10-01 17:00:41 +00:00
66528fdd45
This adds support for Memory24, Memory32, and Memory32Fixed descriptors in PCI host bridge _CRS. I experimentally determined that Windows (2008 R2) accepts these descriptors and treats them as windows that are forwarded to the PCI bus, e.g., if it finds any PCI devices with BARs outside the windows, it moves them into the windows. I don't know whether any machines actually use these descriptors in PCI host bridge _CRS methods, but if any exist and they're new enough that we automatically turn on "pci=use_crs", they will work with Windows but not with Linux. Here are the details: https://bugzilla.kernel.org/show_bug.cgi?id=15817 Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
368 lines
9.2 KiB
C
368 lines
9.2 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 <linux/slab.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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struct acpi_device *bridge;
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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 bool pci_use_crs = true;
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static int __init set_use_crs(const struct dmi_system_id *id)
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{
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pci_use_crs = true;
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return 0;
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}
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static const struct dmi_system_id pci_use_crs_table[] __initconst = {
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/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
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{
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.callback = set_use_crs,
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.ident = "IBM System x3800",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
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DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
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},
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},
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{}
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};
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void __init pci_acpi_crs_quirks(void)
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{
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int year;
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if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
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pci_use_crs = false;
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dmi_check_system(pci_use_crs_table);
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/*
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* If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
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* takes precedence over anything we figured out above.
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*/
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if (pci_probe & PCI_ROOT_NO_CRS)
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pci_use_crs = false;
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else if (pci_probe & PCI_USE__CRS)
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pci_use_crs = true;
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printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
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"if necessary, use \"pci=%s\" and report a bug\n",
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pci_use_crs ? "Using" : "Ignoring",
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pci_use_crs ? "nocrs" : "use_crs");
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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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struct acpi_resource_memory24 *memory24;
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struct acpi_resource_memory32 *memory32;
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struct acpi_resource_fixed_memory32 *fixed_memory32;
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memset(addr, 0, sizeof(*addr));
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switch (resource->type) {
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case ACPI_RESOURCE_TYPE_MEMORY24:
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memory24 = &resource->data.memory24;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->minimum = memory24->minimum;
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addr->address_length = memory24->address_length;
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addr->maximum = addr->minimum + addr->address_length - 1;
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return AE_OK;
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case ACPI_RESOURCE_TYPE_MEMORY32:
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memory32 = &resource->data.memory32;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->minimum = memory32->minimum;
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addr->address_length = memory32->address_length;
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addr->maximum = addr->minimum + addr->address_length - 1;
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return AE_OK;
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case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
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fixed_memory32 = &resource->data.fixed_memory32;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->minimum = fixed_memory32->address;
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addr->address_length = fixed_memory32->address_length;
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addr->maximum = addr->minimum + addr->address_length - 1;
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return AE_OK;
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case ACPI_RESOURCE_TYPE_ADDRESS16:
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case ACPI_RESOURCE_TYPE_ADDRESS32:
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case ACPI_RESOURCE_TYPE_ADDRESS64:
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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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return AE_OK;
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}
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break;
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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 void
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align_resource(struct acpi_device *bridge, struct resource *res)
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{
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int align = (res->flags & IORESOURCE_MEM) ? 16 : 4;
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/*
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* Host bridge windows are not BARs, but the decoders on the PCI side
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* that claim this address space have starting alignment and length
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* constraints, so fix any obvious BIOS goofs.
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*/
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if (!IS_ALIGNED(res->start, align)) {
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dev_printk(KERN_DEBUG, &bridge->dev,
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"host bridge window %pR invalid; "
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"aligning start to %d-byte boundary\n", res, align);
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res->start &= ~(align - 1);
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}
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if (!IS_ALIGNED(res->end + 1, align)) {
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dev_printk(KERN_DEBUG, &bridge->dev,
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"host bridge window %pR invalid; "
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"aligning end to %d-byte boundary\n", res, align);
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res->end = ALIGN(res->end, align) - 1;
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}
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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, *conflict;
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u64 start, end, max_len;
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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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max_len = addr.maximum - addr.minimum + 1;
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if (addr.address_length > max_len) {
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dev_printk(KERN_DEBUG, &info->bridge->dev,
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"host bridge window length %#llx doesn't fit in "
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"%#llx-%#llx, trimming\n",
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(unsigned long long) addr.address_length,
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(unsigned long long) addr.minimum,
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(unsigned long long) addr.maximum);
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addr.address_length = max_len;
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}
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start = addr.minimum + addr.translation_offset;
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end = start + addr.address_length - 1;
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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 = start;
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res->end = end;
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res->child = NULL;
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align_resource(info->bridge, res);
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if (!pci_use_crs) {
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dev_printk(KERN_DEBUG, &info->bridge->dev,
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"host bridge window %pR (ignored)\n", res);
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return AE_OK;
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}
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conflict = insert_resource_conflict(root, res);
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if (conflict) {
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dev_err(&info->bridge->dev,
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"address space collision: host bridge window %pR "
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"conflicts with %s %pR\n",
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res, conflict->name, conflict);
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} else {
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pci_bus_add_resource(info->bus, res, 0);
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info->res_num++;
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if (addr.translation_offset)
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dev_info(&info->bridge->dev, "host bridge window %pR "
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"(PCI address [%#llx-%#llx])\n",
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res, res->start - addr.translation_offset,
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res->end - addr.translation_offset);
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else
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dev_info(&info->bridge->dev,
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"host bridge window %pR\n", res);
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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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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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if (pci_use_crs)
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pci_bus_remove_resources(bus);
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info.bridge = device;
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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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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_bus %04x:%02x: "
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"ignored (multiple domains not supported)\n",
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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_WARNING "pci_bus %04x:%02x: "
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"ignored (out of memory)\n", domain, 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_create_bus(NULL, busnum, &pci_root_ops, sd);
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if (bus) {
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get_current_resources(device, busnum, domain, bus);
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bus->subordinate = pci_scan_child_bus(bus);
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}
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}
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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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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 (acpi_noirq)
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return -ENODEV;
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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_enable_irq = acpi_pci_irq_enable;
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pcibios_disable_irq = acpi_pci_irq_disable;
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x86_init.pci.init_irq = x86_init_noop;
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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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