drm/i915/gt: Reset execlists registers before HWSP

Upon gt resume, we first poison then sanitize the engine. However, our
testing shows that gen9 will very rarely retain the poisoned value from
the HWSP mappings of the execlists status registers. This suggests that
it is reading back from the HWSP, so rejig the register reset.

v2: Maybe RING_CONTEXT_STATUS_PTR is write masked. It is.

References: https://gitlab.freedesktop.org/drm/intel/-/issues/1812
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200513100120.11617-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 15716e4..32feb2a 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -3939,6 +3939,14 @@ static void reset_csb_pointers(struct intel_engine_cs *engine)
        ring_set_paused(engine, 0);
 
        /*
+        * Sometimes Icelake forgets to reset its pointers on a GPU reset.
+        * Bludgeon them with a mmio update to be sure.
+        */
+       ENGINE_WRITE(engine, RING_CONTEXT_STATUS_PTR,
+                    0xffff << 16 | reset_value << 8 | reset_value);
+       ENGINE_POSTING_READ(engine, RING_CONTEXT_STATUS_PTR);
+
+       /*
         * After a reset, the HW starts writing into CSB entry [0]. We
         * therefore have to set our HEAD pointer back one entry so that
         * the *first* entry we check is entry 0. To complicate this further,
@@ -3951,16 +3959,15 @@ static void reset_csb_pointers(struct intel_engine_cs *engine)
        WRITE_ONCE(*execlists->csb_write, reset_value);
        wmb(); /* Make sure this is visible to HW (paranoia?) */
 
-       /*
-        * Sometimes Icelake forgets to reset its pointers on a GPU reset.
-        * Bludgeon them with a mmio update to be sure.
-        */
+       invalidate_csb_entries(&execlists->csb_status[0],
+                              &execlists->csb_status[reset_value]);
+
+       /* Once more for luck and our trusty paranoia */
        ENGINE_WRITE(engine, RING_CONTEXT_STATUS_PTR,
-                    reset_value << 8 | reset_value);
+                    0xffff << 16 | reset_value << 8 | reset_value);
        ENGINE_POSTING_READ(engine, RING_CONTEXT_STATUS_PTR);
 
-       invalidate_csb_entries(&execlists->csb_status[0],
-                              &execlists->csb_status[reset_value]);
+       GEM_BUG_ON(READ_ONCE(*execlists->csb_write) != reset_value);
 }
 
 static void execlists_sanitize(struct intel_engine_cs *engine)