[Intel-gfx] [PATCH 1/4] drm/i915: Enable WA batch buffers for Gen9

[Siluvery, Arun]

On 03/07/2015 17:57, Chris Wilson wrote:
> On Fri, Jul 03, 2015 at 05:53:38PM +0100, Arun Siluvery wrote:
>> This patch only enables support for Gen9, the actual WA will be
>> initialized in subsequent patches.
>>
>> The WARN that we use to warn user if WA batch support is not available
>> for a particular Gen is replaced with DRM_ERROR as warning here doesn't
>> really add much value.
>>
>> Cc: Imre Deak <imre.deak at intel.com>
>> Signed-off-by: Arun Siluvery <arun.siluvery at linux.intel.com>
>> ---
>>   drivers/gpu/drm/i915/intel_lrc.c | 41 +++++++++++++++++++++++++++++++++++++---
>>   1 file changed, 38 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
>> index 23ff018..927f395 100644
>> --- a/drivers/gpu/drm/i915/intel_lrc.c
>> +++ b/drivers/gpu/drm/i915/intel_lrc.c
>> @@ -1269,6 +1269,26 @@ static int gen8_init_perctx_bb(struct intel_engine_cs *ring,
>>   	return wa_ctx_end(wa_ctx, *offset = index, 1);
>>   }
>>
>> +static int gen9_init_indirectctx_bb(struct intel_engine_cs *ring,
>> +				    struct i915_wa_ctx_bb *wa_ctx,
>> +				    uint32_t *const batch,
>> +				    uint32_t *offset)
>> +{
>> +	/* FIXME: Replace me with WA */
>
> Do the same int index = wa_ctx_begin();
>
> wa_ctx_emit(MI_BATCH_BUFFER_END) (and MI_NOOP for perctx)
>
> return wa_ctx_end()
>
> you did for gen8. That way the series doesn't suddenly break halfway
> through (or just after the first patch) and we can check the
> infrastructure in situ, and the actual wa separately later.

(forgot to reply-all)

right, will update it along with other review comments, thanks.

regards
Arun

> -Chris
>