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x86: work around io allocation overlap of HT links

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normally BIOSes assign io/mmio range to different HT links without
overlapping, even same node same link should get non overlapping
entries.

but Rafael L. Wysocki's buggy BIOS creates a link with overlapping
entries for mmio and io:

  node 0 link 0: io port [1000, ffffff]
  node 0 link 0: mmio [e0000000, efffffff]
  node 0 link 0: mmio [a0000, bffff]
  node 0 link 0: mmio [80000000, ffffffff]

try to merge them and we will get:

  bus: [00, ff] on node 0 link 0
  bus: 00 index 0 io port: [0, ffff]
  bus: 00 index 1 mmio: [80000000, fcffffffff]
  bus: 00 index 2 mmio: [a0000, bffff]

so later we will reduce the chance to assign used resource to
unassigned device.

Reported-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Tested-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Yinghai Lu 2008-04-13 01:41:58 -07:00 committed by Ingo Molnar
parent cbf9bd603a
commit e8ee6f0ae5
1 changed files with 38 additions and 18 deletions
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56
arch/x86/pci/k8-bus_64.c
View file

@ -112,17 +112,25 @@ static void __init update_range(struct res_range *range, size_t start,
for (j = 0; j < RANGE_NUM; j++) {
if (!range[j].end)
continue;
if (start == range[j].start && end < range[j].end) {
range[j].start = end + 1;
break;
} else if (start == range[j].start && end == range[j].end) {
if (start <= range[j].start && end >= range[j].end) {
range[j].start = 0;
range[j].end = 0;
break;
} else if (start > range[j].start && end == range[j].end) {
continue;
}
if (start <= range[j].start && end < range[j].end && range[j].start < end + 1) {
range[j].start = end + 1;
continue;
}
if (start > range[j].start && end >= range[j].end && range[j].end > start - 1) {
range[j].end = start - 1;
break;
} else if (start > range[j].start && end < range[j].end) {
continue;
}
if (start > range[j].start && end < range[j].end) {
/* find the new spare */
for (i = 0; i < RANGE_NUM; i++) {
if (range[i].end == 0)
@ -135,7 +143,7 @@ static void __init update_range(struct res_range *range, size_t start,
printk(KERN_ERR "run of slot in ranges\n");
}
range[j].end = start - 1;
break;
continue;
}
}
}
@ -151,16 +159,24 @@ static void __init update_res(struct pci_root_info *info, size_t start,
/* try to merge it with old one */
for (i = 0; i < info->res_num; i++) {
size_t final_start, final_end;
size_t common_start, common_end;
res = &info->res[i];
if (res->flags != flags)
continue;
if (res->end + 1 == start) {
res->end = end;
return;
} else if (end + 1 == res->start) {
res->start = start;
return;
}
common_start = max((size_t)res->start, start);
common_end = min((size_t)res->end, end);
if (common_start > common_end + 1)
continue;
final_start = min((size_t)res->start, start);
final_end = max((size_t)res->end, end);
res->start = final_start;
res->end = final_end;
return;
}
addit:
@ -336,7 +352,11 @@ static int __init early_fill_mp_bus_info(void)
info = &pci_root_info[j];
printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
node, link, (u64)start, (u64)end);
update_res(info, start, end, IORESOURCE_IO, 0);
/* kernel only handle 16 bit only */
if (end > 0xffff)
end = 0xffff;
update_res(info, start, end, IORESOURCE_IO, 1);
update_range(range, start, end);
}
/* add left over io port range to def node/link, [0, 0xffff] */
@ -444,7 +464,7 @@ static int __init early_fill_mp_bus_info(void)
}
}
update_res(info, start, end, IORESOURCE_MEM, 0);
update_res(info, start, end, IORESOURCE_MEM, 1);
update_range(range, start, end);
printk(KERN_CONT "\n");
}