[Intel-gfx] [PATCH v2] drm/i915: Recreate vmapping even when the object is pinned

[Chris Wilson]

Sometimes we know we are the only user of the bo, but since we take a
protective pin_pages early on, an attempt to change the vmap on the
object is denied because it is busy. i915_gem_object_pin_map() cannot
tell from our single pin_count if the operation is safe. Instead we must
pass that information down from the caller in the manner of
I915_MAP_OVERRIDE.

This issue has existed from the introduction of the mapping, but was
never noticed as the only place where this conflict might happen is for
cached kernel buffers (such as allocated by i915_gem_batch_pool_get()).
Until recently there was only a single user (the cmdparser) so no
conflicts ever occurred. However, we now use it to allocate batches for
different operations (using MAP_WC on !llc for writes) in addition to the
existing shadow batch (using MAP_WB for reads).

We could either keep both mappings cached, or use a different write
mechanism if we detect a MAP_WB already exists (i.e. clflush
afterwards), but as we haven't seen this issue in the wild (it requires
hitting the GPU reloc path in addition to the cmdparser) for simplicity
just allow the mappings to be recreated.

v2: Include the i915_MAP_OVERRIDE bit in the enum so the compiler knows
about all the valid values.

Fixes: 7dd4f6729f92 ("drm/i915: Async GPU relocation processing")
Testcase: igt/gem_lut_handle # byt, completely by accident
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_cmd_parser.c     | 2 +-
 drivers/gpu/drm/i915/i915_drv.h            | 3 +++
 drivers/gpu/drm/i915/i915_gem.c            | 7 ++++++-
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 4 +++-
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index f0cb22cc0dd6..8ba932b22f7c 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -1073,7 +1073,7 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
 		goto unpin_src;
 	}
 
-	dst = i915_gem_object_pin_map(dst_obj, I915_MAP_WB);
+	dst = i915_gem_object_pin_map(dst_obj, I915_MAP_FORCE_WB);
 	if (IS_ERR(dst))
 		goto unpin_dst;
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8352cbe0c444..0383e879a315 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3485,6 +3485,9 @@ void __i915_gem_object_invalidate(struct drm_i915_gem_object *obj);
 enum i915_map_type {
 	I915_MAP_WB = 0,
 	I915_MAP_WC,
+#define I915_MAP_OVERRIDE BIT(31)
+	I915_MAP_FORCE_WB = I915_MAP_WB | I915_MAP_OVERRIDE,
+	I915_MAP_FORCE_WC = I915_MAP_WC | I915_MAP_OVERRIDE,
 };
 
 /**
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 37fbc64d9ffe..43834dee4e8d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2553,6 +2553,9 @@ static void *i915_gem_object_map(const struct drm_i915_gem_object *obj,
 	GEM_BUG_ON(i != n_pages);
 
 	switch (type) {
+	default:
+		MISSING_CASE(type);
+		/* fallthrough to use PAGE_KERNEL anyway */
 	case I915_MAP_WB:
 		pgprot = PAGE_KERNEL;
 		break;
@@ -2583,7 +2586,9 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj,
 	if (ret)
 		return ERR_PTR(ret);
 
-	pinned = true;
+	pinned = !(type & I915_MAP_OVERRIDE);
+	type &= ~I915_MAP_OVERRIDE;
+
 	if (!atomic_inc_not_zero(&obj->mm.pages_pin_count)) {
 		if (unlikely(IS_ERR_OR_NULL(obj->mm.pages))) {
 			ret = ____i915_gem_object_get_pages(obj);
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 1c4fac032329..dcce69a23309 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1071,7 +1071,9 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
 		return PTR_ERR(obj);
 
 	cmd = i915_gem_object_pin_map(obj,
-				      cache->has_llc ? I915_MAP_WB : I915_MAP_WC);
+				      cache->has_llc ?
+				      I915_MAP_FORCE_WB :
+				      I915_MAP_FORCE_WC);
 	i915_gem_object_unpin_pages(obj);
 	if (IS_ERR(cmd))
 		return PTR_ERR(cmd);
-- 
2.14.1