[Intel-gfx] [PATCH] drm/i915: Add relocation exceptions for two other platforms

[Zbigniew Kempczyński]

We have established previously we stop using relocations starting
from gen12 platforms with Tigerlake as an exception. We keep this
statement but we want to enable relocations conditionally for
Rocketlake and Alderlake under require_force_probe flag set.

Keeping relocations under require_force_probe flag is interim solution
until IGTs will be rewritten to use softpin.

Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski at intel.com>
Cc: Dave Airlie <airlied at redhat.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Jason Ekstrand <jason at jlekstrand.net>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 26 +++++++++++++++----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 297143511f99..c0562dd14837 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -491,16 +491,32 @@ eb_unreserve_vma(struct eb_vma *ev)
 	ev->flags &= ~__EXEC_OBJECT_RESERVED;
 }
 
+static inline bool
+platform_has_relocs_enabled(const struct i915_execbuffer *eb)
+{
+	/*
+	 * Relocations are disallowed starting from gen12 with Tigerlake
+	 * as an exception. We allow temporarily use relocations for Rocketlake
+	 * and Alderlake when require_force_probe flag is set.
+	 */
+
+	if (INTEL_GEN(eb->i915) < 12 || IS_TIGERLAKE(eb->i915))
+		return true;
+
+	if (INTEL_INFO(eb->i915)->require_force_probe &&
+		 (IS_ROCKETLAKE(eb->i915) || IS_ALDERLAKE_S(eb->i915) ||
+		  IS_ALDERLAKE_P(eb->i915)))
+		return true;
+
+	return false;
+}
+
 static int
 eb_validate_vma(struct i915_execbuffer *eb,
 		struct drm_i915_gem_exec_object2 *entry,
 		struct i915_vma *vma)
 {
-	/* Relocations are disallowed for all platforms after TGL-LP.  This
-	 * also covers all platforms with local memory.
-	 */
-	if (entry->relocation_count &&
-	    INTEL_GEN(eb->i915) >= 12 && !IS_TIGERLAKE(eb->i915))
+	if (entry->relocation_count && !platform_has_relocs_enabled(eb))
 		return -EINVAL;
 
 	if (unlikely(entry->flags & eb->invalid_flags))
-- 
2.26.0