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PNPACPI: truncate _CRS windows with _LEN > _MAX - _MIN + 1

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The ACPI spec (sec 6.4.3.5 in v4.0) requires that for Address Space Resource
Descriptors, _LEN <= _MAX - _MIN + 1 in all cases, but there are BIOSes that
violate this.  We experimentally determined that Windows truncates the
resource so it doesn't extend past _MAX, so let's do the same thing in
Linux.

http://bugzilla.kernel.org/show_bug.cgi?id=15480

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2010-03-25 10:32:49 -06:00 committed by Len Brown
parent 2eaa9cfdf3
commit 3162b6f0c5
1 changed files with 30 additions and 12 deletions
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42
drivers/pnp/pnpacpi/rsparser.c
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@ -273,12 +273,33 @@ static void pnpacpi_parse_allocated_busresource(struct pnp_dev *dev,
pnp_add_bus_resource(dev, start, end);
}
static u64 addr_space_length(struct pnp_dev *dev, u64 min, u64 max, u64 len)
{
u64 max_len;
max_len = max - min + 1;
if (len <= max_len)
return len;
/*
* Per 6.4.3.5, _LEN cannot exceed _MAX - _MIN + 1, but some BIOSes
* don't do this correctly, e.g.,
* https://bugzilla.kernel.org/show_bug.cgi?id=15480
*/
dev_info(&dev->dev,
"resource length %#llx doesn't fit in %#llx-%#llx, trimming\n",
(unsigned long long) len, (unsigned long long) min,
(unsigned long long) max);
return max_len;
}
static void pnpacpi_parse_allocated_address_space(struct pnp_dev *dev,
struct acpi_resource *res)
{
struct acpi_resource_address64 addr, *p = &addr;
acpi_status status;
int window;
u64 len;
status = acpi_resource_to_address64(res, p);
if (!ACPI_SUCCESS(status)) {
@ -287,20 +308,18 @@ static void pnpacpi_parse_allocated_address_space(struct pnp_dev *dev,
return;
}
len = addr_space_length(dev, p->minimum, p->maximum, p->address_length);
window = (p->producer_consumer == ACPI_PRODUCER) ? 1 : 0;
if (p->resource_type == ACPI_MEMORY_RANGE)
pnpacpi_parse_allocated_memresource(dev,
p->minimum, p->address_length,
pnpacpi_parse_allocated_memresource(dev, p->minimum, len,
p->info.mem.write_protect, window);
else if (p->resource_type == ACPI_IO_RANGE)
pnpacpi_parse_allocated_ioresource(dev,
p->minimum, p->address_length,
pnpacpi_parse_allocated_ioresource(dev, p->minimum, len,
p->granularity == 0xfff ? ACPI_DECODE_10 :
ACPI_DECODE_16, window);
else if (p->resource_type == ACPI_BUS_NUMBER_RANGE)
pnpacpi_parse_allocated_busresource(dev, p->minimum,
p->address_length);
pnpacpi_parse_allocated_busresource(dev, p->minimum, len);
}
static void pnpacpi_parse_allocated_ext_address_space(struct pnp_dev *dev,
@ -308,21 +327,20 @@ static void pnpacpi_parse_allocated_ext_address_space(struct pnp_dev *dev,
{
struct acpi_resource_extended_address64 *p = &res->data.ext_address64;
int window;
u64 len;
len = addr_space_length(dev, p->minimum, p->maximum, p->address_length);
window = (p->producer_consumer == ACPI_PRODUCER) ? 1 : 0;
if (p->resource_type == ACPI_MEMORY_RANGE)
pnpacpi_parse_allocated_memresource(dev,
p->minimum, p->address_length,
pnpacpi_parse_allocated_memresource(dev, p->minimum, len,
p->info.mem.write_protect, window);
else if (p->resource_type == ACPI_IO_RANGE)
pnpacpi_parse_allocated_ioresource(dev,
p->minimum, p->address_length,
pnpacpi_parse_allocated_ioresource(dev, p->minimum, len,
p->granularity == 0xfff ? ACPI_DECODE_10 :
ACPI_DECODE_16, window);
else if (p->resource_type == ACPI_BUS_NUMBER_RANGE)
pnpacpi_parse_allocated_busresource(dev, p->minimum,
p->address_length);
pnpacpi_parse_allocated_busresource(dev, p->minimum, len);
}
static acpi_status pnpacpi_allocated_resource(struct acpi_resource *res,