On Mon, Nov 27, 2023 at 12:11:50PM -0800, Alan Previn wrote:
> Add missing tag for "Wa_14019159160 - Case 2" (for existing
> PXP code that ensures run alone mode bit is set to allow
> PxP-decryption.
>
> v3: - Check targeted platforms using IP_VAL. (John Harrison)
> v2: - Fix WA id number (John Harrison).
> - Improve comments and code to be specific
> for the targeted platforms (John Harrison)
>
> Signed-off-by: Alan Previn <alan.previn.teres.ale...@intel.com>
> ---
> drivers/gpu/drm/i915/gt/intel_lrc.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c
> b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index 7c367ba8d9dc..1152cf25d578 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -863,10 +863,12 @@ static bool ctx_needs_runalone(const struct
> intel_context *ce)
> bool ctx_is_protected = false;
>
> /*
> - * On MTL and newer platforms, protected contexts require setting
> - * the LRC run-alone bit or else the encryption will not happen.
> + * Wa_14019159160 - Case 2: mtl
> + * On some platforms, protected contexts require setting
> + * the LRC run-alone bit or else the encryption/decryption will not
> happen.
> + * NOTE: Case 2 only applies to PXP use-case of said workaround.
> */
> - if (GRAPHICS_VER_FULL(ce->engine->i915) >= IP_VER(12, 70) &&
> + if (GRAPHICS_VER_FULL(ce->engine->i915) == IP_VER(12, 70) &&
The workaround database lists this as being needed on both 12.70 and
12.71. Should this be a
IS_GFX_GT_IP_RANGE(gt, IP_VER(12, 70), IP_VER(12, 71))
check instead?
The workaround is also listed in the database as applying to DG2; is
this "case 2" subset of the workaround not relevant to that platform?
Matt
> (ce->engine->class == COMPUTE_CLASS || ce->engine->class ==
> RENDER_CLASS)) {
> rcu_read_lock();
> gem_ctx = rcu_dereference(ce->gem_context);
>
> base-commit: 5429d55de723544dfc0630cf39d96392052b27a1
> --
> 2.39.0
>
--
Matt Roper
Graphics Software Engineer
Linux GPU Platform Enablement
Intel Corporation
