[Intel-gfx] [PATCH v2 1/1] drm/i915/mtl: Disable MC6 for MTL A step
Badal Nilawar
badal.nilawar at intel.com
Fri Mar 10 06:13:39 UTC 2023
The Wa_14017073508 require to send Media Busy/Idle mailbox while
accessing Media tile. As of now it is getting handled while __gt_unpark,
__gt_park. But there are various corner cases where forcewakes are taken
without __gt_unpark i.e. without sending Busy Mailbox especially during
register reads. Forcewakes are taken without busy mailbox leads to
GPU HANG. So bringing mailbox calls under forcewake calls are no feasible
option as forcewake calls are atomic and mailbox calls are blocking.
The issue already fixed in B step so disabling MC6 on A step and
reverting previous commit which handles Wa_14017073508
Fixes: 8f70f1ec587d ("drm/i915/mtl: Add Wa_14017073508 for SAMedia")
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar at intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 27 -----------------------
drivers/gpu/drm/i915/gt/intel_rc6.c | 8 +++++++
drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c | 13 +----------
drivers/gpu/drm/i915/i915_reg.h | 9 --------
4 files changed, 9 insertions(+), 48 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index 85ae7dc079f2..e02cb90723ae 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -20,31 +20,10 @@
#include "intel_rc6.h"
#include "intel_rps.h"
#include "intel_wakeref.h"
-#include "intel_pcode.h"
#include "pxp/intel_pxp_pm.h"
#define I915_GT_SUSPEND_IDLE_TIMEOUT (HZ / 2)
-static void mtl_media_busy(struct intel_gt *gt)
-{
- /* Wa_14017073508: mtl */
- if (IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0) &&
- gt->type == GT_MEDIA)
- snb_pcode_write_p(gt->uncore, PCODE_MBOX_GT_STATE,
- PCODE_MBOX_GT_STATE_MEDIA_BUSY,
- PCODE_MBOX_GT_STATE_DOMAIN_MEDIA, 0);
-}
-
-static void mtl_media_idle(struct intel_gt *gt)
-{
- /* Wa_14017073508: mtl */
- if (IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0) &&
- gt->type == GT_MEDIA)
- snb_pcode_write_p(gt->uncore, PCODE_MBOX_GT_STATE,
- PCODE_MBOX_GT_STATE_MEDIA_NOT_BUSY,
- PCODE_MBOX_GT_STATE_DOMAIN_MEDIA, 0);
-}
-
static void user_forcewake(struct intel_gt *gt, bool suspend)
{
int count = atomic_read(>->user_wakeref);
@@ -92,9 +71,6 @@ static int __gt_unpark(struct intel_wakeref *wf)
GT_TRACE(gt, "\n");
- /* Wa_14017073508: mtl */
- mtl_media_busy(gt);
-
/*
* It seems that the DMC likes to transition between the DC states a lot
* when there are no connected displays (no active power domains) during
@@ -144,9 +120,6 @@ static int __gt_park(struct intel_wakeref *wf)
GEM_BUG_ON(!wakeref);
intel_display_power_put_async(i915, POWER_DOMAIN_GT_IRQ, wakeref);
- /* Wa_14017073508: mtl */
- mtl_media_idle(gt);
-
return 0;
}
diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c b/drivers/gpu/drm/i915/gt/intel_rc6.c
index 5c91622dfca4..f4150f61f39c 100644
--- a/drivers/gpu/drm/i915/gt/intel_rc6.c
+++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
@@ -486,6 +486,7 @@ static bool bxt_check_bios_rc6_setup(struct intel_rc6 *rc6)
static bool rc6_supported(struct intel_rc6 *rc6)
{
struct drm_i915_private *i915 = rc6_to_i915(rc6);
+ struct intel_gt *gt = rc6_to_gt(rc6);
if (!HAS_RC6(i915))
return false;
@@ -502,6 +503,13 @@ 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) {
+ drm_notice(&i915->drm,
+ "Media RC6 disabled on A step\n");
+ return false;
+ }
+
return true;
}
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c
index fcf51614f9a4..1adec6de223c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_rc.c
@@ -12,20 +12,9 @@
static bool __guc_rc_supported(struct intel_guc *guc)
{
- struct intel_gt *gt = guc_to_gt(guc);
-
- /*
- * Wa_14017073508: mtl
- * Do not enable gucrc to avoid additional interrupts which
- * may disrupt pcode wa.
- */
- if (IS_MTL_GRAPHICS_STEP(gt->i915, P, STEP_A0, STEP_B0) &&
- gt->type == GT_MEDIA)
- return false;
-
/* GuC RC is unavailable for pre-Gen12 */
return guc->submission_supported &&
- GRAPHICS_VER(gt->i915) >= 12;
+ GRAPHICS_VER(guc_to_gt(guc)->i915) >= 12;
}
static bool __guc_rc_selected(struct intel_guc *guc)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b9b6d46dfe1b..9db6b3f06a74 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6460,15 +6460,6 @@
/* XEHP_PCODE_FREQUENCY_CONFIG param2 */
#define PCODE_MBOX_DOMAIN_NONE 0x0
#define PCODE_MBOX_DOMAIN_MEDIAFF 0x3
-
-/* Wa_14017210380: mtl */
-#define PCODE_MBOX_GT_STATE 0x50
-/* sub-commands (param1) */
-#define PCODE_MBOX_GT_STATE_MEDIA_BUSY 0x1
-#define PCODE_MBOX_GT_STATE_MEDIA_NOT_BUSY 0x2
-/* param2 */
-#define PCODE_MBOX_GT_STATE_DOMAIN_MEDIA 0x1
-
#define GEN6_PCODE_DATA _MMIO(0x138128)
#define GEN6_PCODE_FREQ_IA_RATIO_SHIFT 8
#define GEN6_PCODE_FREQ_RING_RATIO_SHIFT 16
--
2.25.1
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