[Intel-gfx] [PATCH v3 08/13] drm/i915/uapi: tweak error capture on recoverable contexts

[Matthew Auld]

A non-recoverable context must be used if the user wants proper error
capture on discrete platforms. In the future the kernel may want to blit
the contents of some objects when later doing the capture stage. Also
extend to newer integrated platforms.

v2(Thomas):
  - Also extend to newer integrated platforms, for capture buffer memory
    allocation purposes.
v3 (Reported-by: kernel test robot <lkp at intel.com>):
  - Fix build on !CONFIG_DRM_I915_CAPTURE_ERROR

Testcase: igt at gem_exec_capture@capture-recoverable
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Jon Bloomfield <jon.bloomfield at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Kenneth Graunke <kenneth at whitecape.org>
Cc: Akeem G Abodunrin <akeem.g.abodunrin at intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 30fe847c6664..b7b2c14fd9e1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -1951,7 +1951,7 @@ eb_find_first_request_added(struct i915_execbuffer *eb)
 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
 
 /* Stage with GFP_KERNEL allocations before we enter the signaling critical path */
-static void eb_capture_stage(struct i915_execbuffer *eb)
+static int eb_capture_stage(struct i915_execbuffer *eb)
 {
 	const unsigned int count = eb->buffer_count;
 	unsigned int i = count, j;
@@ -1964,6 +1964,10 @@ static void eb_capture_stage(struct i915_execbuffer *eb)
 		if (!(flags & EXEC_OBJECT_CAPTURE))
 			continue;
 
+		if (i915_gem_context_is_recoverable(eb->gem_context) &&
+		    (IS_DGFX(eb->i915) || GRAPHICS_VER_FULL(eb->i915) > IP_VER(12, 0)))
+			return -EINVAL;
+
 		for_each_batch_create_order(eb, j) {
 			struct i915_capture_list *capture;
 
@@ -1976,6 +1980,8 @@ static void eb_capture_stage(struct i915_execbuffer *eb)
 			eb->capture_lists[j] = capture;
 		}
 	}
+
+	return 0;
 }
 
 /* Commit once we're in the critical path */
@@ -2017,8 +2023,9 @@ static void eb_capture_list_clear(struct i915_execbuffer *eb)
 
 #else
 
-static void eb_capture_stage(struct i915_execbuffer *eb)
+static int eb_capture_stage(struct i915_execbuffer *eb)
 {
+	return 0;
 }
 
 static void eb_capture_commit(struct i915_execbuffer *eb)
@@ -3410,7 +3417,9 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 	}
 
 	ww_acquire_done(&eb.ww.ctx);
-	eb_capture_stage(&eb);
+	err = eb_capture_stage(&eb);
+	if (err)
+		goto err_vma;
 
 	out_fence = eb_requests_create(&eb, in_fence, out_fence_fd);
 	if (IS_ERR(out_fence)) {
-- 
2.36.1