drm/i915: Improve execbuf debug

Convert i915_gem_check_execbuffer to return the error code instead of
a boolean so our neat EINVAL debugging trick works within this function.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20191209122314.16289-1-tvrtko.ursulin@linux.intel.com

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 34044c6..5003e61 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -1915,15 +1915,15 @@ err_skip:
        return err;
 }
 
-static bool i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
+static int i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
 {
        if (exec->flags & __I915_EXEC_ILLEGAL_FLAGS)
-               return false;
+               return -EINVAL;
 
        /* Kernel clipping was a DRI1 misfeature */
        if (!(exec->flags & I915_EXEC_FENCE_ARRAY)) {
                if (exec->num_cliprects || exec->cliprects_ptr)
-                       return false;
+                       return -EINVAL;
        }
 
        if (exec->DR4 == 0xffffffff) {
@@ -1931,12 +1931,12 @@ static bool i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
                exec->DR4 = 0;
        }
        if (exec->DR1 || exec->DR4)
-               return false;
+               return -EINVAL;
 
        if ((exec->batch_start_offset | exec->batch_len) & 0x7)
-               return false;
+               return -EINVAL;
 
-       return true;
+       return 0;
 }
 
 static int i915_reset_gen7_sol_offsets(struct i915_request *rq)
@@ -2768,8 +2768,9 @@ i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
        exec2.flags = I915_EXEC_RENDER;
        i915_execbuffer2_set_context_id(exec2, 0);
 
-       if (!i915_gem_check_execbuffer(&exec2))
-               return -EINVAL;
+       err = i915_gem_check_execbuffer(&exec2);
+       if (err)
+               return err;
 
        /* Copy in the exec list from userland */
        exec_list = kvmalloc_array(count, sizeof(*exec_list),
@@ -2846,8 +2847,9 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
                return -EINVAL;
        }
 
-       if (!i915_gem_check_execbuffer(args))
-               return -EINVAL;
+       err = i915_gem_check_execbuffer(args);
+       if (err)
+               return err;
 
        /* Allocate an extra slot for use by the command parser */
        exec2_list = kvmalloc_array(count + 1, eb_element_size(),