On Fri, Feb 08, 2019 at 09:00:59PM +0200, Jani Nikula wrote:
> On Fri, 08 Feb 2019, Ville Syrjälä <ville.syrj...@linux.intel.com> wrote:
> > On Fri, Feb 08, 2019 at 08:42:53PM +0200, Jani Nikula wrote:
> >> Starting from opregion version 2.1 (roughly corresponding to ICL+) the
> >> RVDA field is relative from the beginning of opregion, not absolute
> >> address.
> >>
> >> Fix the error path while at it.
> >>
> >> v2: Make relative vs. absolute conditional on the opregion version,
> >> bumped for the purpose. Turned out there are machines relying on
> >> absolute RVDA in the wild.
> >>
> >> v3: Fix the version checks
> >>
> >> Fixes: 04ebaadb9f2d ("drm/i915/opregion: handle VBT sizes bigger than 6
> >> KB")
> >> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> >> Cc: Imre Deak <imre.d...@intel.com>
> >> Signed-off-by: Jani Nikula <jani.nik...@intel.com>
> >> ---
> >> drivers/gpu/drm/i915/intel_opregion.c | 24 +++++++++++++++++++++---
> >> 1 file changed, 21 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_opregion.c
> >> b/drivers/gpu/drm/i915/intel_opregion.c
> >> index f1b841580521..5e00ee9270b5 100644
> >> --- a/drivers/gpu/drm/i915/intel_opregion.c
> >> +++ b/drivers/gpu/drm/i915/intel_opregion.c
> >> @@ -123,7 +123,8 @@ struct opregion_asle {
> >> u64 fdss;
> >> u32 fdsp;
> >> u32 stat;
> >> - u64 rvda; /* Physical address of raw vbt data */
> >> + u64 rvda; /* Physical (2.0) or relative from opregion (2.1+)
> >> + * address of raw VBT data. */
> >> u32 rvds; /* Size of raw vbt data */
> >> u8 rsvd[58];
> >> } __packed;
> >> @@ -964,9 +965,24 @@ int intel_opregion_setup(struct drm_i915_private
> >> *dev_priv)
> >>
> >> if (opregion->header->over.major >= 2 && opregion->asle &&
>
> Push this line to short term memory.
Stack overflow.
Series is
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
>
> >> opregion->asle->rvda && opregion->asle->rvds) {
> >> - opregion->rvda = memremap(opregion->asle->rvda,
> >> - opregion->asle->rvds,
> >> + resource_size_t rvda = opregion->asle->rvda;
> >> +
> >> + /*
> >> + * opregion 2.0: rvda is the physical VBT address.
> >> + *
> >> + * opregion 2.1+: rvda is unsigned, relative offset from
> >> + * opregion base, and should never point within opregion.
> >> + */
> >> + if (opregion->header->over.major > 2 ||
> >> + opregion->header->over.minor >= 1) {
> >
> > What happens with version 1.1?
>
> Pop. ;)
>
> BR,
> Jani.
>
> >
> >> + WARN_ON(rvda < OPREGION_SIZE);
> >> +
> >> + rvda += asls;
> >> + }
> >> +
> >> + opregion->rvda = memremap(rvda, opregion->asle->rvds,
> >> MEMREMAP_WB);
> >> +
> >> vbt = opregion->rvda;
> >> vbt_size = opregion->asle->rvds;
> >> if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
> >> @@ -976,6 +992,8 @@ int intel_opregion_setup(struct drm_i915_private
> >> *dev_priv)
> >> goto out;
> >> } else {
> >> DRM_DEBUG_KMS("Invalid VBT in ACPI OpRegion (RVDA)\n");
> >> + memunmap(opregion->rvda);
> >> + opregion->rvda = NULL;
> >> }
> >> }
> >>
> >> --
> >> 2.20.1
>
> --
> Jani Nikula, Intel Open Source Graphics Center
--
Ville Syrjälä
Intel
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