[Intel-gfx] [PATCH 4/8] drm/i915: Eliminate IS_MTL_MEDIA_STEP

[Matt Roper]

Stepping-specific media behavior shouldn't be tied to MTL as a platform,
but rather specifically to the Xe_LPM+ IP.  Future non-MTL platforms may
re-use this IP and will need to follow the exact same logic and apply
the same workarounds.  IS_MTL_MEDIA_STEP() is dropped in favor of a new
macro IS_MEDIA_IPVER_STEP() that checks the media IP version associated
with a specific IP and also ensures that we're operating on the media
GT, not the primary GT.

This new macro will return false if the GT is NULL (so it's safe to pass
i915->media_gt as a parameter, even though that will be NULL on
platforms without standalone media).  We don't expect this macro to used
to match media versions earlier than 13 (when media became a standalone
GT), so a build error will be raised if this macro is used to match on a
pre-13 version of media.  That restriction can be adjusted in the future
if we find a use for this macro on earlier platforms.

Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_rc6.c |  3 +--
 drivers/gpu/drm/i915/i915_drv.h     | 10 ++++++----
 drivers/gpu/drm/i915/i915_perf.c    | 15 ++++-----------
 3 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index 58bb1c55294c..91c68c0ec32d 100644
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -526,8 +526,7 @@ static bool rc6_supported(struct intel_rc6 *rc6)
 		return false;
 	}
 
-	if (IS_MTL_MEDIA_STEP(gt->i915, STEP_A0, STEP_B0) &&
-	    gt->type == GT_MEDIA) {
+	if (IS_MEDIA_IPVER_STEP(gt, IP_VER(13, 0), STEP_A0, STEP_B0)) {
 		drm_notice(&i915->drm,
 			   "Media RC6 disabled on A step\n");
 		return false;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d03710c923c8..10741177b654 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -698,14 +698,16 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 	  GRAPHICS_VER_FULL(__gt->i915) == ipver && \
 	  IS_GRAPHICS_STEP(__gt->i915, since, until)))
 
+#define IS_MEDIA_IPVER_STEP(__gt, ipver, since, until) \
+	(BUILD_BUG_ON_ZERO(ipver < IP_VER(13, 0)) + \
+	 (__gt && __gt->type == GT_MEDIA && \
+	  MEDIA_VER_FULL(__gt->i915) == ipver && \
+	  IS_MEDIA_STEP(__gt->i915, since, until)))
+
 #define IS_MTL_DISPLAY_STEP(__i915, since, until) \
 	(IS_METEORLAKE(__i915) && \
 	 IS_DISPLAY_STEP(__i915, since, until))
 
-#define IS_MTL_MEDIA_STEP(__i915, since, until) \
-	(IS_METEORLAKE(__i915) && \
-	 IS_MEDIA_STEP(__i915, since, until))
-
 /*
  * DG2 hardware steppings are a bit unusual.  The hardware design was forked to
  * create three variants (G10, G11, and G12) which each have distinct
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 49c6f1ff1128..ff95f2cdf2b0 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -4223,7 +4223,7 @@ static int read_properties_unlocked(struct i915_perf *perf,
 	 * C6 disable in BIOS. Fail if Media C6 is enabled on steppings where OAM
 	 * does not work as expected.
 	 */
-	if (IS_MTL_MEDIA_STEP(props->engine->i915, STEP_A0, STEP_C0) &&
+	if (IS_MEDIA_IPVER_STEP(props->engine->gt, IP_VER(13, 0), STEP_A0, STEP_C0) &&
 	    props->engine->oa_group->type == TYPE_OAM &&
 	    intel_check_bios_c6_setup(&props->engine->gt->rc6)) {
 		drm_dbg(&perf->i915->drm,
@@ -5332,16 +5332,9 @@ int i915_perf_ioctl_version(struct drm_i915_private *i915)
 	 * C6 disable in BIOS. If Media C6 is enabled in BIOS, return version 6
 	 * to indicate that OA media is not supported.
 	 */
-	if (IS_MTL_MEDIA_STEP(i915, STEP_A0, STEP_C0)) {
-		struct intel_gt *gt;
-		int i;
-
-		for_each_gt(gt, i915, i) {
-			if (gt->type == GT_MEDIA &&
-			    intel_check_bios_c6_setup(&gt->rc6))
-				return 6;
-		}
-	}
+	if (IS_MEDIA_IPVER_STEP(i915->media_gt, IP_VER(13, 0), STEP_A0, STEP_C0) &&
+	    intel_check_bios_c6_setup(&i915->media_gt->rc6))
+		return 6;
 
 	return 7;
 }
-- 
2.41.0