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Code Issues Releases Activity

Further relax the strictness of enforcing allocations to only come from

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decoded ranges.  Pass any request for a specific range that fails because
it is not in a decoded range for an ACPI Host-PCI bridge up to the parent
to see if it can still be allocated.  This is based on the assumption that
many BIOSes are inconsistent/broken and that settings programmed into BARs
or resources assigned to other built-in components are more trustworthy than
the list of decoded resource ranges in _CRS.  This effectively limits the
decoded ranges to only being used for "wildcard" ranges when allocating
fresh resources for a BAR, etc.  At some point I would like to only be
this permissive during an early scan of firmware-assigned resources during
boot and to be strict about all later allocations, but that isn't viable
currently.

MFC after:	2 weeks
This commit is contained in:
John Baldwin 2011-12-29 16:23:14 +00:00
parent 0c0d27d5dd
commit a74d695299
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228961
1 changed files with 10 additions and 1 deletions
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11
sys/dev/acpica/acpi_pcib_acpi.c
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@ -511,8 +511,17 @@ acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
sc = device_get_softc(dev);
res = pcib_host_res_alloc(&sc->ap_host_res, child, type, rid, start, end,
count, flags);
/*
* XXX: If this is a request for a specific range, assume it is
* correct and pass it up to the parent. What we probably want to
* do long-term is explicitly trust any firmware-configured
* resources during the initial bus scan on boot and then disable
* this after that.
*/
if (res == NULL && start + count - 1 == end)
res = acpi_alloc_sysres(child, type, rid, start, end, count, flags);
res = bus_generic_alloc_resource(dev, child, type, rid, start, end,
count, flags);
return (res);
#else
return (bus_generic_alloc_resource(dev, child, type, rid, start, end,