On 11/25/20 5:21 AM, Souza, Jose wrote:
> On Tue, 2020-11-24 at 16:31 -0800, Aditya Swarup wrote:
>> Fix TGL REVID macros to fetch correct display/gt stepping based
>> on SOC rev id from INTEL_REVID() macro. Previously, we were just
>> returning the first element of the revid array instead of using
>> the correct index based on SOC rev id.
>>
>> Also, add array bound checks for TGL REV ID array. Since, there
>> might be a possibility of using older kernels on latest platform
>> revision, resulting in out of bounds access for rev ID array.
>> In this scenario, print message for unsupported rev ID and apply
>> settings for latest rev ID available.
>>
>> Fixes: ("drm/i915/tgl: Fix stepping WA matching")
>> Cc: José Roberto de Souza <jose.so...@intel.com>
>> Cc: Matt Roper <matthew.d.ro...@intel.com>
>> Cc: Lucas De Marchi <lucas.demar...@intel.com>
>> Cc: Jani Nikula <jani.nik...@intel.com>
>> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
>> Signed-off-by: Aditya Swarup <aditya.swa...@intel.com>
>> ---
>> drivers/gpu/drm/i915/i915_drv.h | 35 +++++++++++++++++++++++++++------
>> 1 file changed, 29 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h
>> b/drivers/gpu/drm/i915/i915_drv.h
>> index 15be8debae54..29d55b7017be 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -1572,16 +1572,37 @@ enum {
>> TGL_REVID_D0,
>> };
>>
>>
>>
>>
>>
>>
>>
>>
>> -extern const struct i915_rev_steppings tgl_uy_revids[];
>> -extern const struct i915_rev_steppings tgl_revids[];
>> +extern const struct i915_rev_steppings tgl_uy_revids[4];
>> +extern const struct i915_rev_steppings tgl_revids[2];
>
> Not sure if the above will work, saw a comment from Jani please check that.
This works otherwise I can't use ARRAY_SIZE() macro as it is just an extern
declaration,
so the sizeof() doesn't have clue about the size. The only way I can think of
working
around this is by moving tables here but Matt's KBL REVID patch suggests unused
variables errors
but my compiler didn't complain.
>
>> +
>> +#define TGL_UY_REVID_RANGE(revid) \
>> + ((revid) < ARRAY_SIZE(tgl_uy_revids))
>> +
>> +#define TGL_REVID_RANGE(revid) \
>> + ((revid) < ARRAY_SIZE(tgl_revids))
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> static inline const struct i915_rev_steppings *
>> tgl_revids_get(struct drm_i915_private *dev_priv)
>> {
>> - if (IS_TGL_U(dev_priv) || IS_TGL_Y(dev_priv))
>> - return tgl_uy_revids;
>> - else
>> - return tgl_revids;
>> + const u8 revid = INTEL_REVID(dev_priv);
>> +
>> + if (IS_TGL_U(dev_priv) || IS_TGL_Y(dev_priv)) {
>> + if (TGL_UY_REVID_RANGE(revid)) {
>> + return tgl_uy_revids + revid;
>
> Why not help readers and go simple? tgl_uy_revids[revid]
Hmm I will have to change the return type then, as you were returning a pointer
and introduces
compiler error. I will change the return type.
>
>> + } else {
>> + drm_dbg_kms(&dev_priv->drm,
>> + "Unsupported SOC stepping found %u, using
>> %lu instead\n",
>> + revid, ARRAY_SIZE(tgl_uy_revids) - 1);
>> + return tgl_uy_revids + (ARRAY_SIZE(tgl_uy_revids) - 1);
>> + }
>> + } else if (TGL_REVID_RANGE(revid)) {
>> + return tgl_revids + revid;
>> + } else {
>> + drm_dbg_kms(&dev_priv->drm,
>> + "Unsupported SOC stepping found %u, using %lu
>> instead\n",
>> + revid, ARRAY_SIZE(tgl_revids) - 1);
>> + return tgl_uy_revids + (ARRAY_SIZE(tgl_revids) - 1);
>> + }
>
> I bet you can re arrange it and end up with one drm_dbg_kms() call.
I can but that will involve more macros as we are dealing with two different
array tables and each one
with a different range. I will use just one print to say what SOC rev id we get
from pci dev and what
we will be using.
>
>
>> }
>>
>>
>>
>>
>>
>>
>>
>>
>> #define IS_TGL_DISP_REVID(p, since, until) \
>> @@ -1591,12 +1612,14 @@ tgl_revids_get(struct drm_i915_private *dev_priv)
>>
>>
>>
>>
>>
>>
>>
>>
>> #define IS_TGL_UY_GT_REVID(p, since, until) \
>> ((IS_TGL_U(p) || IS_TGL_Y(p)) && \
>> + TGL_UY_REVID_RANGE(INTEL_REVID(p)) && \
>> tgl_uy_revids->gt_stepping >= (since) && \
>> tgl_uy_revids->gt_stepping <= (until))
>>
>>
>>
>>
>>
>>
>>
>>
>> #define IS_TGL_GT_REVID(p, since, until) \
>> (IS_TIGERLAKE(p) && \
>> !(IS_TGL_U(p) || IS_TGL_Y(p)) && \
>> + TGL_REVID_RANGE(INTEL_REVID(p)) && \
>> tgl_revids->gt_stepping >= (since) && \
>> tgl_revids->gt_stepping <= (until))
>>
>>
>>
>>
>>
>>
>>
>
> You did not fixed the issue for GT.
Yes.. I didn't notice that.. Will change in the next revision.
Aditya
>
>>
>>
>>
>>
>>
>
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