[Intel-gfx] [PATCH 01/13] drm/i915: Drop inspection of execbuf flags during evict

[Maarten Lankhorst]

From: Chris Wilson <chris at chris-wilson.co.uk>

With the goal of removing the serialisation from around execbuf, we will
no longer have the privilege of there being a single execbuf in flight
at any time and so will only be able to inspect the user's flags within
the carefully controlled execbuf context. i915_gem_evict_for_node() is
the only user outside of execbuf that currently peeks at the flag to
convert an overlapping softpinned request from ENOSPC to EINVAL. Retract
this nicety and only report ENOSPC if the location is in current use,
either due to this execbuf or another.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191203121316.2972257-1-chris@chris-wilson.co.uk
---
 drivers/gpu/drm/i915/i915_gem_evict.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 0697bedebeef..b75fd3ccd63b 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -292,7 +292,8 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
 		GEM_BUG_ON(!drm_mm_node_allocated(node));
 		vma = container_of(node, typeof(*vma), node);
 
-		/* If we are using coloring to insert guard pages between
+		/*
+		 * If we are using coloring to insert guard pages between
 		 * different cache domains within the address space, we have
 		 * to check whether the objects on either side of our range
 		 * abutt and conflict. If they are in conflict, then we evict
@@ -309,22 +310,18 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
 			}
 		}
 
-		if (flags & PIN_NONBLOCK &&
-		    (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))) {
+		if (i915_vma_is_pinned(vma)) {
 			ret = -ENOSPC;
 			break;
 		}
 
-		/* Overlap of objects in the same batch? */
-		if (i915_vma_is_pinned(vma)) {
+		if (flags & PIN_NONBLOCK && i915_vma_is_active(vma)) {
 			ret = -ENOSPC;
-			if (vma->exec_flags &&
-			    *vma->exec_flags & EXEC_OBJECT_PINNED)
-				ret = -EINVAL;
 			break;
 		}
 
-		/* Never show fear in the face of dragons!
+		/*
+		 * Never show fear in the face of dragons!
 		 *
 		 * We cannot directly remove this node from within this
 		 * iterator and as with i915_gem_evict_something() we employ
-- 
2.24.1