diff options
| author |   Bjorn Helgaas <bhelgaas@google.com> | 2022-03-03 16:00:39 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2022-04-08 11:35:01 -0500 |
| commit | 4c5e242d3e937bb9f9c226d06888d9189826879d (patch) | |
| tree | f9aace0aaef0221038a72df0e43b9bf7ee177d22 /arch/x86/pci/acpi.c | |
| parent | x86: Log resource clipping for E820 regions (diff) | |
| download | linux-dev-4c5e242d3e937bb9f9c226d06888d9189826879d.tar.xz linux-dev-4c5e242d3e937bb9f9c226d06888d9189826879d.zip | |
x86/PCI: Clip only host bridge windows for E820 regions
ACPI firmware advertises PCI host bridge resources via PNP0A03 _CRS
methods. Some BIOSes include non-window address space in _CRS, and if we
allocate that non-window space for PCI devices, they don't work.
4dc2287c1805 ("x86: avoid E820 regions when allocating address space")
works around this issue by clipping out any regions mentioned in the E820
table in the allocate_resource() path, but the implementation has a couple
issues:
- The clipping is done for *all* allocations, not just those for PCI
address space, and
- The clipping is done at each allocation instead of being done once when
setting up the host bridge windows.
Rework the implementation so we only clip PCI host bridge windows, and we
do it once when setting them up.
Example output changes:
BIOS-e820: [mem 0x00000000b0000000-0x00000000c00fffff] reserved
+ acpi PNP0A08:00: clipped [mem 0xc0000000-0xfebfffff window] to [mem 0xc0100000-0xfebfffff window] for e820 entry [mem 0xb0000000-0xc00fffff]
- pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window]
+ pci_bus 0000:00: root bus resource [mem 0xc0100000-0xfebfffff window]
Link: https://lore.kernel.org/r/20220304035110.988712-3-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'arch/x86/pci/acpi.c')
| -rw-r--r-- | arch/x86/pci/acpi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index 052f1d78a562..562c81a51ea0 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -8,6 +8,7 @@ #include <linux/pci-acpi.h> #include <asm/numa.h> #include <asm/pci_x86.h> +#include <asm/e820/api.h> struct pci_root_info { struct acpi_pci_root_info common; @@ -299,6 +300,10 @@ static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) int status; status = acpi_pci_probe_root_resources(ci); + + resource_list_for_each_entry(entry, &ci->resources) + remove_e820_regions(&device->dev, entry->res); + if (pci_use_crs) { resource_list_for_each_entry_safe(entry, tmp, &ci->resources) if (resource_is_pcicfg_ioport(entry->res)) |