drm/i915/selftests: Add live vma selftest

Add a live selftest to excercise rotated/remapped vmas. We simply
write through the rotated/remapped vma, and confirm that the data
appears in the right page when read through the normal vma.

Not sure what the fallout of making all rotated/remapped vmas
mappable/fenceable would be, hence I just hacked it in the test.

v2: Grab rpm reference (Chris)
    GEM_BUG_ON(view.type not as expected) (Chris)
    Allow CAN_FENCE for rotated/remapped vmas (Chris)
    Update intel_plane_uses_fence() to ask for a fence
    only for normal vmas on gen4+
v3: Deal with intel_wakeref_t
v4: Rebase

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190509122159.24376-4-ville.syrjala@linux.intel.com
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index c68b435..343736b 100644 (file)
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -483,14 +483,6 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
        GEM_BUG_ON(!i915_vma_is_ggtt(vma));
        GEM_BUG_ON(!vma->fence_size);
 
-       /*
-        * Explicitly disable for rotated VMA since the display does not
-        * need the fence and the VMA is not accessible to other users.
-        */
-       if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED ||
-           vma->ggtt_view.type == I915_GGTT_VIEW_REMAPPED)
-               return;
-
        fenceable = (vma->node.size >= vma->fence_size &&
                     IS_ALIGNED(vma->node.start, vma->fence_alignment));
 

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 95c850d..24b6b80 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2077,7 +2077,9 @@ static bool intel_plane_uses_fence(const struct intel_plane_state *plane_state)
        struct intel_plane *plane = to_intel_plane(plane_state->base.plane);
        struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 
-       return INTEL_GEN(dev_priv) < 4 || plane->has_fbc;
+       return INTEL_GEN(dev_priv) < 4 ||
+               (plane->has_fbc &&
+                plane_state->view.type == I915_GGTT_VIEW_NORMAL);
 }
 
 struct i915_vma *

diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index 6d76692..a54f590 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -17,6 +17,7 @@ selftest(requests, i915_request_live_selftests)
 selftest(active, i915_active_live_selftests)
 selftest(objects, i915_gem_object_live_selftests)
 selftest(dmabuf, i915_gem_dmabuf_live_selftests)
+selftest(vma, i915_vma_live_selftests)
 selftest(coherency, i915_gem_coherency_live_selftests)
 selftest(gtt, i915_gem_gtt_live_selftests)
 selftest(gem, i915_gem_live_selftests)

diff --git a/drivers/gpu/drm/i915/selftests/i915_vma.c b/drivers/gpu/drm/i915/selftests/i915_vma.c
index 89f6ef9..0027c1f 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_vma.c
+++ b/drivers/gpu/drm/i915/selftests/i915_vma.c
@@ -834,3 +834,145 @@ out_put:
        drm_dev_put(&i915->drm);
        return err;
 }
+
+static int igt_vma_remapped_gtt(void *arg)
+{
+       struct drm_i915_private *i915 = arg;
+       const struct intel_remapped_plane_info planes[] = {
+               { .width = 1, .height = 1, .stride = 1 },
+               { .width = 2, .height = 2, .stride = 2 },
+               { .width = 4, .height = 4, .stride = 4 },
+               { .width = 8, .height = 8, .stride = 8 },
+
+               { .width = 3, .height = 5, .stride = 3 },
+               { .width = 3, .height = 5, .stride = 4 },
+               { .width = 3, .height = 5, .stride = 5 },
+
+               { .width = 5, .height = 3, .stride = 5 },
+               { .width = 5, .height = 3, .stride = 7 },
+               { .width = 5, .height = 3, .stride = 9 },
+
+               { .width = 4, .height = 6, .stride = 6 },
+               { .width = 6, .height = 4, .stride = 6 },
+               { }
+       }, *p;
+       enum i915_ggtt_view_type types[] = {
+               I915_GGTT_VIEW_ROTATED,
+               I915_GGTT_VIEW_REMAPPED,
+               0,
+       }, *t;
+       struct drm_i915_gem_object *obj;
+       intel_wakeref_t wakeref;
+       int err = 0;
+
+       obj = i915_gem_object_create_internal(i915, 10 * 10 * PAGE_SIZE);
+       if (IS_ERR(obj))
+               return PTR_ERR(obj);
+
+       mutex_lock(&i915->drm.struct_mutex);
+
+       wakeref = intel_runtime_pm_get(i915);
+
+       for (t = types; *t; t++) {
+               for (p = planes; p->width; p++) {
+                       struct i915_ggtt_view view = {
+                               .type = *t,
+                               .rotated.plane[0] = *p,
+                       };
+                       struct i915_vma *vma;
+                       u32 __iomem *map;
+                       unsigned int x, y;
+                       int err;
+
+                       err = i915_gem_object_set_to_gtt_domain(obj, true);
+                       if (err)
+                               goto out;
+
+                       vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);
+                       if (IS_ERR(vma)) {
+                               err = PTR_ERR(vma);
+                               goto out;
+                       }
+
+                       GEM_BUG_ON(vma->ggtt_view.type != *t);
+
+                       map = i915_vma_pin_iomap(vma);
+                       i915_vma_unpin(vma);
+                       if (IS_ERR(map)) {
+                               err = PTR_ERR(map);
+                               goto out;
+                       }
+
+                       for (y = 0 ; y < p->height; y++) {
+                               for (x = 0 ; x < p->width; x++) {
+                                       unsigned int offset;
+                                       u32 val = y << 16 | x;
+
+                                       if (*t == I915_GGTT_VIEW_ROTATED)
+                                               offset = (x * p->height + y) * PAGE_SIZE;
+                                       else
+                                               offset = (y * p->width + x) * PAGE_SIZE;
+
+                                       iowrite32(val, &map[offset / sizeof(*map)]);
+                               }
+                       }
+
+                       i915_vma_unpin_iomap(vma);
+
+                       vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, PIN_MAPPABLE);
+                       if (IS_ERR(vma)) {
+                               err = PTR_ERR(vma);
+                               goto out;
+                       }
+
+                       GEM_BUG_ON(vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL);
+
+                       map = i915_vma_pin_iomap(vma);
+                       i915_vma_unpin(vma);
+                       if (IS_ERR(map)) {
+                               err = PTR_ERR(map);
+                               goto out;
+                       }
+
+                       for (y = 0 ; y < p->height; y++) {
+                               for (x = 0 ; x < p->width; x++) {
+                                       unsigned int offset, src_idx;
+                                       u32 exp = y << 16 | x;
+                                       u32 val;
+
+                                       if (*t == I915_GGTT_VIEW_ROTATED)
+                                               src_idx = rotated_index(&view.rotated, 0, x, y);
+                                       else
+                                               src_idx = remapped_index(&view.remapped, 0, x, y);
+                                       offset = src_idx * PAGE_SIZE;
+
+                                       val = ioread32(&map[offset / sizeof(*map)]);
+                                       if (val != exp) {
+                                               pr_err("%s VMA write test failed, expected 0x%x, found 0x%x\n",
+                                                      *t == I915_GGTT_VIEW_ROTATED ? "Rotated" : "Remapped",
+                                                      val, exp);
+                                               i915_vma_unpin_iomap(vma);
+                                               goto out;
+                                       }
+                               }
+                       }
+                       i915_vma_unpin_iomap(vma);
+               }
+       }
+
+out:
+       intel_runtime_pm_put(i915, wakeref);
+       mutex_unlock(&i915->drm.struct_mutex);
+       i915_gem_object_put(obj);
+
+       return err;
+}
+
+int i915_vma_live_selftests(struct drm_i915_private *i915)
+{
+       static const struct i915_subtest tests[] = {
+               SUBTEST(igt_vma_remapped_gtt),
+       };
+
+       return i915_subtests(tests, i915);
+}