On 25/10/2021 05:26, Cooper Chiou wrote:
This implements WaProgramMgsrForCorrectSliceSpecificMmioReads which
was omitted by mistake from Gen9 documentation, while it is actually
applicable to fused off parts.
Workaround consists of making sure MCR packet control register is
programmed to point to enabled slice/subslice pair before doing any
MMIO reads from the affected registers.
Failure do to this can result in complete system hangs when running
certain workloads. Two known cases which can cause system hangs are:
1. "test_basic progvar_prog_scope_uninit" test which is part of
Khronos OpenCL conformance suite
(https://github.com/KhronosGroup/OpenCL-CTS) with the Intel
OpenCL driver (https://github.com/intel/compute-runtime).
2. VP8 media hardware encoding using the full-feature build of the
Intel media-driver (https://github.com/intel/media-driver) and
ffmpeg.
For the former case patch was verified to fix the hard system hang
when executing the OCL test on Intel Pentium CPU 6405U which contains
fused off GT1 graphics.
Reference: HSD#1508045018,1405586840, BSID#0575
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: William Tseng <william.tseng@xxxxxxxxx>
Cc: Shawn C Lee <shawn.c.lee@xxxxxxxxx>
Cc: Pawel Wilma <pawel.wilma@xxxxxxxxx>
Signed-off-by: Cooper Chiou <cooper.chiou@xxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
P.S. You could have preserved my r-b from an earlier version since it is
the same code, just different commit message.
---
drivers/gpu/drm/i915/gt/intel_workarounds.c | 41 +++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index e1f362530889..8ae24da601b0 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -877,11 +877,52 @@ hsw_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
wa_write_clr(wal, GEN7_FF_THREAD_MODE, GEN7_FF_VS_REF_CNT_FFME);
}
+static void
+gen9_wa_init_mcr(struct drm_i915_private *i915, struct i915_wa_list *wal)
+{
+ const struct sseu_dev_info *sseu = &i915->gt.info.sseu;
+ unsigned int slice, subslice;
+ u32 mcr, mcr_mask;
+
+ GEM_BUG_ON(GRAPHICS_VER(i915) != 9);
+
+ /*
+ * WaProgramMgsrForCorrectSliceSpecificMmioReads:gen9,glk,kbl,cml
+ * Before any MMIO read into slice/subslice specific registers, MCR
+ * packet control register needs to be programmed to point to any
+ * enabled s/ss pair. Otherwise, incorrect values will be returned.
+ * This means each subsequent MMIO read will be forwarded to an
+ * specific s/ss combination, but this is OK since these registers
+ * are consistent across s/ss in almost all cases. In the rare
+ * occasions, such as INSTDONE, where this value is dependent
+ * on s/ss combo, the read should be done with read_subslice_reg.
+ */
+ slice = ffs(sseu->slice_mask) - 1;
+ GEM_BUG_ON(slice >= ARRAY_SIZE(sseu->subslice_mask));
+ subslice = ffs(intel_sseu_get_subslices(sseu, slice));
+ GEM_BUG_ON(!subslice);
+ subslice--;
+
+ /*
+ * We use GEN8_MCR..() macros to calculate the |mcr| value for
+ * Gen9 to address WaProgramMgsrForCorrectSliceSpecificMmioReads
+ */
+ mcr = GEN8_MCR_SLICE(slice) | GEN8_MCR_SUBSLICE(subslice);
+ mcr_mask = GEN8_MCR_SLICE_MASK | GEN8_MCR_SUBSLICE_MASK;
+
+ drm_dbg(&i915->drm, "MCR slice:%d/subslice:%d = %x\n", slice, subslice, mcr);
+
+ wa_write_clr_set(wal, GEN8_MCR_SELECTOR, mcr_mask, mcr);
+}
+
static void
gen9_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
{
struct drm_i915_private *i915 = gt->i915;
+ /* WaProgramMgsrForCorrectSliceSpecificMmioReads:glk,kbl,cml,gen9 */
+ gen9_wa_init_mcr(i915, wal);
+
/* WaDisableKillLogic:bxt,skl,kbl */
if (!IS_COFFEELAKE(i915) && !IS_COMETLAKE(i915))
wa_write_or(wal,
