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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2022-02-11 17:32:20 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2022-02-11 17:32:20 +0100
commit27a98fe60b033dfce95361abe368750994b8a78e (patch)
tree19075bc04ecbd2179159939747fedc29d39e9900 /arch
parentcb1f65c1e1424a4b5e4a86da8aa3b8fd8459c8ec (diff)
parent3eb616b26408ac813c67280cf883f36d98b8441d (diff)
Merge branch 'acpi-x86'
Merge a revert of a problematic commit for 5.17-rc4. * acpi-x86: x86/PCI: revert "Ignore E820 reservations for bridge windows on newer systems"
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/resource.c23
1 files changed, 1 insertions, 22 deletions
diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
index 9ae64f9af956..9b9fb7882c20 100644
--- a/arch/x86/kernel/resource.c
+++ b/arch/x86/kernel/resource.c
@@ -1,5 +1,4 @@
// SPDX-License-Identifier: GPL-2.0
-#include <linux/dmi.h>
#include <linux/ioport.h>
#include <asm/e820/api.h>
@@ -24,31 +23,11 @@ static void resource_clip(struct resource *res, resource_size_t start,
res->start = end + 1;
}
-/*
- * Some BIOS-es contain a bug where they add addresses which map to
- * system RAM in the PCI host bridge window returned by the ACPI _CRS
- * method, see commit 4dc2287c1805 ("x86: avoid E820 regions when
- * allocating address space"). To avoid this Linux by default excludes
- * E820 reservations when allocating addresses since 2010.
- * In 2019 some systems have shown-up with E820 reservations which cover
- * the entire _CRS returned PCI host bridge window, causing all attempts
- * to assign memory to PCI BARs to fail if Linux uses E820 reservations.
- *
- * Ideally Linux would fully stop using E820 reservations, but then
- * the old systems this was added for will regress.
- * Instead keep the old behavior for old systems, while ignoring the
- * E820 reservations for any systems from now on.
- */
static void remove_e820_regions(struct resource *avail)
{
- int i, year = dmi_get_bios_year();
+ int i;
struct e820_entry *entry;
- if (year >= 2018)
- return;
-
- pr_info_once("PCI: Removing E820 reservations from host bridge windows\n");
-
for (i = 0; i < e820_table->nr_entries; i++) {
entry = &e820_table->entries[i];