drm/i915: Verify workarounds immediately after application

Immediately after writing the workaround, verify that it stuck in the
register.

References: https://bugs.freedesktop.org/show_bug.cgi?id=108954
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190417075657.19456-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index ccaf636..ea9292e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -913,6 +913,20 @@ wal_get_fw_for_rmw(struct intel_uncore *uncore, const struct i915_wa_list *wal)
        return fw;
 }
 
+static bool
+wa_verify(const struct i915_wa *wa, u32 cur, const char *name, const char *from)
+{
+       if ((cur ^ wa->val) & wa->mask) {
+               DRM_ERROR("%s workaround lost on %s! (%x=%x/%x, expected %x, mask=%x)\n",
+                         name, from, i915_mmio_reg_offset(wa->reg), cur,
+                         cur & wa->mask, wa->val, wa->mask);
+
+               return false;
+       }
+
+       return true;
+}
+
 static void
 wa_list_apply(struct intel_uncore *uncore, const struct i915_wa_list *wal)
 {
@@ -931,6 +945,10 @@ wa_list_apply(struct intel_uncore *uncore, const struct i915_wa_list *wal)
 
        for (i = 0, wa = wal->list; i < wal->count; i++, wa++) {
                intel_uncore_rmw_fw(uncore, wa->reg, wa->mask, wa->val);
+               if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM))
+                       wa_verify(wa,
+                                 intel_uncore_read_fw(uncore, wa->reg),
+                                 wal->name, "application");
        }
 
        intel_uncore_forcewake_put__locked(uncore, fw);
@@ -942,20 +960,6 @@ void intel_gt_apply_workarounds(struct drm_i915_private *i915)
        wa_list_apply(&i915->uncore, &i915->gt_wa_list);
 }
 
-static bool
-wa_verify(const struct i915_wa *wa, u32 cur, const char *name, const char *from)
-{
-       if ((cur ^ wa->val) & wa->mask) {
-               DRM_ERROR("%s workaround lost on %s! (%x=%x/%x, expected %x, mask=%x)\n",
-                         name, from, i915_mmio_reg_offset(wa->reg), cur,
-                         cur & wa->mask, wa->val, wa->mask);
-
-               return false;
-       }
-
-       return true;
-}
-
 static bool wa_list_verify(struct intel_uncore *uncore,
                           const struct i915_wa_list *wal,
                           const char *from)