[Intel-gfx] [RFC 56/60] drm/i915/dsb: Enable lmem for dsb

[Matthew Auld]

From: Animesh Manna <animesh.manna at intel.com>

For dgfx, DSB should use local memory instead of system memory. Using
local memory surely brings performance improvement as local memory is
close to gpu. Also want to avoid multiple gpu using system memory.

Use LMEM API to create gem object needed for DSB command buffer.

Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Ramalingam C <ramalingam.c at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Animesh Manna <animesh.manna at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 566fa72427b3..86f5f4b3c46b 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -6,6 +6,7 @@
 
 #include "i915_drv.h"
 #include "intel_display_types.h"
+#include "gem/i915_gem_lmem.h"
 
 #define DSB_BUF_SIZE    (2 * PAGE_SIZE)
 
@@ -278,7 +279,11 @@ void intel_dsb_prepare(struct intel_crtc_state *crtc_state)
 
 	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
 
-	obj = i915_gem_object_create_internal(i915, DSB_BUF_SIZE);
+	if (HAS_LMEM(i915))
+		obj = i915_gem_object_create_lmem(i915, DSB_BUF_SIZE, 0);
+	else
+		obj = i915_gem_object_create_internal(i915, DSB_BUF_SIZE);
+
 	if (IS_ERR(obj)) {
 		drm_err(&i915->drm, "Gem object creation failed\n");
 		kfree(dsb);
-- 
2.26.2