[Intel-gfx] [RFC 60/60] drm/i915/lmem: allocate HWSP in lmem

[Matthew Auld]

From: Michel Thierry <michel.thierry at intel.com>

Signed-off-by: Michel Thierry <michel.thierry at intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_pages.c | 14 ++++++++++++--
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 10 +++++++++-
 drivers/gpu/drm/i915/gt/intel_timeline.c  |  8 +++++++-
 3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 7050519c87a4..bac33310594c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -251,8 +251,18 @@ static void *i915_gem_object_map(struct drm_i915_gem_object *obj,
 	struct vm_struct *area;
 	pgprot_t pgprot;
 
-	if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC)
-		return NULL;
+	/*
+	 * XXX: we need to check all the places that try to kmap LMEM,
+	 * and ensure that they only do so with WC(if we are certain
+	 * that such an object should reside there). After that we can
+	 * then re-add the following:
+	 *
+	 * if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC)
+	 *	return NULL;
+	 */
+
+	 if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC)
+		 type = I915_MAP_WC;
 
 	/* A single page can always be kmapped */
 	if (n_pte == 1 && type == I915_MAP_WB)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 1df94e82550f..1eb74571d142 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -25,6 +25,7 @@
 #include <drm/drm_print.h>
 
 #include "gem/i915_gem_context.h"
+#include "gem/i915_gem_lmem.h"
 
 #include "i915_drv.h"
 
@@ -651,7 +652,14 @@ static int init_status_page(struct intel_engine_cs *engine)
 	 * in GFP_DMA32 for i965, and no earlier physical address users had
 	 * access to more than 4G.
 	 */
-	obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
+	if (HAS_LMEM(engine->i915)) {
+		obj = i915_gem_object_create_lmem(engine->i915,
+						  PAGE_SIZE,
+						  I915_BO_ALLOC_CONTIGUOUS |
+						  I915_BO_ALLOC_VOLATILE);
+	} else {
+		obj = i915_gem_object_create_internal(engine->i915, PAGE_SIZE);
+	}
 	if (IS_ERR(obj)) {
 		drm_err(&engine->i915->drm,
 			"Failed to allocate status page\n");
diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index 4546284fede1..45e96ecba86a 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -6,6 +6,7 @@
 
 #include "i915_drv.h"
 
+#include "gem/i915_gem_lmem.h"
 #include "i915_active.h"
 #include "i915_syncmap.h"
 #include "intel_gt.h"
@@ -32,7 +33,12 @@ static struct i915_vma *__hwsp_alloc(struct intel_gt *gt)
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 
-	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+	if (HAS_LMEM(i915))
+		obj = i915_gem_object_create_lmem(i915, PAGE_SIZE,
+						  I915_BO_ALLOC_CONTIGUOUS |
+						  I915_BO_ALLOC_VOLATILE);
+	else
+		obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
 	if (IS_ERR(obj))
 		return ERR_CAST(obj);
 
-- 
2.26.2