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Date: Fri, 31 Oct 2008 13:20:02 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...e.hu>
CC: Robert Hancock <hancockr@...w.ca>,
e1000-devel@...ts.sourceforge.net,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc2 hates my e1000e
please try this on your system. it works with test case like
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000100 - 0000000000095800 (usable)
BIOS-e820: 0000000000095800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 00000000d7fa0000 (usable)
BIOS-e820: 00000000d7fae000 - 00000000d7fb0000 (reserved)
BIOS-e820: 00000000d7fb0000 - 00000000d7fbe000 (ACPI data)
BIOS-e820: 00000000d7fbe000 - 00000000d7ff0000 (ACPI NVS)
BIOS-e820: 00000000d7ff0000 - 00000000d8000000 (reserved)
BIOS-e820: 00000000dc000000 - 00000000f0000000 (reserved)
BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000ff700000 - 0000000100000000 (reserved)
BIOS-e820: 0000000100000000 - 0000004028000000 (usable)
// test stub
e820_add_region(0xf0000000, 0xd300000, E820_RESERVED);
update_e820();
modified physical RAM map:
modified: 0000000000000100 - 0000000000095800 (usable)
modified: 0000000000095800 - 00000000000a0000 (reserved)
modified: 00000000000e6000 - 0000000000100000 (reserved)
modified: 0000000000100000 - 00000000d7fa0000 (usable)
modified: 00000000d7fae000 - 00000000d7fb0000 (reserved)
modified: 00000000d7fb0000 - 00000000d7fbe000 (ACPI data)
modified: 00000000d7fbe000 - 00000000d7ff0000 (ACPI NVS)
modified: 00000000d7ff0000 - 00000000d8000000 (reserved)
modified: 00000000dc000000 - 00000000fd300000 (reserved)
modified: 00000000fec00000 - 00000000fec01000 (reserved)
modified: 00000000fee00000 - 00000000fee01000 (reserved)
modified: 00000000ff700000 - 0000000100000000 (reserved)
modified: 0000000100000000 - 0000004028000000 (usable)
Allocating PCI resources starting at d8400000 (gap: d8000000:4000000)
will get:
[ 8.536336] modified physical RAM map:
[ 8.540016] modified: 0000000000000100 - 0000000000095800 (usable)
[ 8.544900] modified: 0000000000095800 - 00000000000a0000 (reserved)
[ 8.549065] modified: 00000000000e6000 - 0000000000100000 (reserved)
[ 8.556015] modified: 0000000000100000 - 00000000d7fa0000 (usable)
[ 8.560892] modified: 00000000d7fae000 - 00000000d7fb0000 (reserved)
[ 8.565064] modified: 00000000d7fb0000 - 00000000d7fbe000 (ACPI data)
[ 8.569150] modified: 00000000d7fbe000 - 00000000d7ff0000 (ACPI NVS)
[ 8.573072] modified: 00000000d7ff0000 - 00000000d8000000 (reserved)
[ 8.580015] modified: 00000000dc000000 - 00000000fb200000 (reserved)
[ 8.585063] modified: 00000000fec00000 - 00000000fec01000 (reserved)
[ 8.589064] modified: 00000000fee00000 - 00000000fee01000 (reserved)
[ 8.596015] modified: 00000000ff700000 - 0000000100000000 (reserved)
[ 8.601063] modified: 0000000100000000 - 0000004028000000 (usable)
d8000000-dfffffff : PCI Bus #00
dc000000-dfffffff : GART
dc000000-dfffffff : reserved
e0000000-efffffff : PCI MMCONFIG 0
e0000000-efffffff : reserved
f0000000-fdffffff : PCI Bus #00
f0000000-faefffff : reserved
faf00000-fcffffff : PCI Bus 0000:01
faf00000-fb1fffff : reserved
fbfff000-fbffffff : 0000:01:06.0
fc000000-fcffffff : 0000:01:06.0
fd000000-fd2fffff : PCI Bus 0000:02
fd000000-fd2fffff : PCI Bus 0000:03
fd000000-fd1fffff : PCI Bus 0000:04
fd160000-fd17ffff : 0000:04:00.1
fd160000-fd17ffff : e1000e
fd180000-fd19ffff : 0000:04:00.1
fd180000-fd19ffff : e1000e
fd1a0000-fd1bffff : 0000:04:00.0
fd1c0000-fd1dffff : 0000:04:00.0
fd1c0000-fd1dffff : e1000e
fd1e0000-fd1fffff : 0000:04:00.0
fd1e0000-fd1fffff : e1000e
fd200000-fd2fffff : PCI Bus 0000:05
fd280000-fd29ffff : 0000:05:00.1
fd280000-fd29ffff : e1000e
fd2a0000-fd2bffff : 0000:05:00.1
fd2a0000-fd2bffff : e1000e
fd2c0000-fd2dffff : 0000:05:00.0
fd2c0000-fd2dffff : e1000e
fd2e0000-fd2fffff : 0000:05:00.0
fd2e0000-fd2fffff : e1000e
[PATCH] x86: remove PCI bar range from e820 reserved entries
Impact: clean up buggy e820 tables
so make those ranges can be claimed by drivers
acctually BIOS is not supposed to put resource in pci BAR in reserved entries of e820.
e820 entries should only include reserved range include mmconfig, lapic, ... and others
that are not in BARs
---
arch/x86/kernel/e820.c | 70 +++++++++++++++++++++++++++++++++++--------------
arch/x86/pci/i386.c | 55 ++++++++++++++++++++++++++++++++++++++
2 files changed, 106 insertions(+), 19 deletions(-)
Index: linux-2.6/arch/x86/kernel/e820.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820.c
+++ linux-2.6/arch/x86/kernel/e820.c
@@ -1271,35 +1271,43 @@ static inline const char *e820_type_to_s
/*
* Mark e820 reserved areas as busy for the resource manager.
*/
-static struct resource __initdata *e820_res;
void __init e820_reserve_resources(void)
{
- int i;
struct resource *res;
+ int i, count = 0;
u64 end;
- res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
- e820_res = res;
for (i = 0; i < e820.nr_map; i++) {
end = e820.map[i].addr + e820.map[i].size - 1;
- if (end != (resource_size_t)end) {
- res++;
+ if (end != (u64)(resource_size_t)end)
continue;
- }
- res->name = e820_type_to_string(e820.map[i].type);
- res->start = e820.map[i].addr;
- res->end = end;
+ if (e820.map[i].type != E820_RESERVED ||
+ e820.map[i].addr < (1ULL<<20))
+ count++;
+ }
- res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ res = alloc_bootmem_low(sizeof(struct resource) * count);
+ for (i = 0; i < e820.nr_map; i++) {
+ end = e820.map[i].addr + e820.map[i].size - 1;
+ if (end != (u64)(resource_size_t)end)
+ continue;
/*
- * don't register the region that could be conflicted with
- * pci device BAR resource and insert them later in
+ * don't register the region that could be conflicted
+ * with pci device BAR resource and insert them later in
* pcibios_resource_survey()
*/
- if (e820.map[i].type != E820_RESERVED || res->start < (1ULL<<20))
+ if (e820.map[i].type != E820_RESERVED ||
+ e820.map[i].addr < (1ULL<<20)) {
+ res->name = e820_type_to_string(e820.map[i].type);
+ res->start = e820.map[i].addr;
+ res->end = end;
+
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+
insert_resource(&iomem_resource, res);
- res++;
+ res++;
+ }
}
for (i = 0; i < e820_saved.nr_map; i++) {
@@ -1312,13 +1320,37 @@ void __init e820_reserve_resources(void)
void __init e820_reserve_resources_late(void)
{
- int i;
struct resource *res;
+ int i, count = 0;
+ u64 end;
- res = e820_res;
+ /* only insert reserved entries here, also need to recount them */
for (i = 0; i < e820.nr_map; i++) {
- if (!res->parent && res->end)
- reserve_region_with_split(&iomem_resource, res->start, res->end, res->name);
+ end = e820.map[i].addr + e820.map[i].size - 1;
+ if (end != (u64)(resource_size_t)end)
+ continue;
+ if (e820.map[i].type != E820_RESERVED ||
+ e820.map[i].addr < (1ULL<<20))
+ continue;
+ count++;
+ }
+
+ res = kzalloc(sizeof(struct resource) * count, GFP_KERNEL);
+ for (i = 0; i < e820.nr_map; i++) {
+ end = e820.map[i].addr + e820.map[i].size - 1;
+ if (end != (u64)(resource_size_t)end)
+ continue;
+
+ if (e820.map[i].type != E820_RESERVED ||
+ e820.map[i].addr < (1ULL<<20))
+ continue;
+
+ res->name = e820_type_to_string(e820.map[i].type);
+ res->start = e820.map[i].addr;
+ res->end = end;
+
+ reserve_region_with_split(&iomem_resource, res->start,
+ res->end, res->name);
res++;
}
}
Index: linux-2.6/arch/x86/pci/i386.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/i386.c
+++ linux-2.6/arch/x86/pci/i386.c
@@ -194,6 +194,60 @@ static void __init pcibios_allocate_reso
}
}
+static __initdata u64 real_removed_size;
+static void __init e820_remove_bus_overlap(struct list_head *bus_list)
+{
+ struct pci_bus *bus;
+ struct pci_dev *dev;
+ int idx;
+ struct resource *r;
+
+ /* Depth-First Search on bus tree */
+ list_for_each_entry(bus, bus_list, node) {
+ dev = bus->self;
+ if (dev) {
+ for (idx = PCI_BRIDGE_RESOURCES;
+ idx < PCI_NUM_RESOURCES; idx++) {
+ r = &dev->resource[idx];
+ if (!(r->flags & IORESOURCE_MEM))
+ continue;
+ real_removed_size += e820_remove_range(r->start,
+ r->end - r->start + 1,
+ E820_RESERVED, 1);
+ }
+ }
+ e820_remove_bus_overlap(&bus->children);
+ }
+}
+static void __init e820_remove_bar_overlap(void)
+{
+ struct pci_dev *dev = NULL;
+ int idx;
+ struct resource *r;
+
+ real_removed_size = 0;
+
+ e820_remove_bus_overlap(&pci_root_buses);
+
+ for_each_pci_dev(dev) {
+ for (idx = 0; idx < PCI_ROM_RESOURCE; idx++) {
+ r = &dev->resource[idx];
+ if (!r->start) /* Address not assigned at all */
+ continue;
+ if (!(r->flags & IORESOURCE_MEM))
+ continue;
+ real_removed_size += e820_remove_range(r->start,
+ r->end - r->start + 1,
+ E820_RESERVED, 1);
+ }
+ }
+
+ if (real_removed_size)
+ update_e820();
+
+}
+
+
static int __init pcibios_assign_resources(void)
{
struct pci_dev *dev = NULL;
@@ -229,6 +283,7 @@ void __init pcibios_resource_survey(void
pcibios_allocate_resources(0);
pcibios_allocate_resources(1);
+ e820_remove_bar_overlap();
e820_reserve_resources_late();
}
--
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