linux-kernel - [PATCH 1/5] drm/i915: instantiate ttm ranger manager for stolen memory

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Date:   Mon, 11 Apr 2022 19:24:49 +0000
From:   Robert Beckett <bob.beckett@...labora.com>
To:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Robert Beckett <bob.beckett@...labora.com>,
        Matthew Auld <matthew.auld@...el.com>,
        Thomas Hellström 
        <thomas.hellstrom@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] drm/i915: instantiate ttm ranger manager for stolen memory

prepare for ttm based stolen region by using ttm range manager
as the resource manager for stolen region.

Signed-off-by: Robert Beckett <bob.beckett@...labora.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c |  6 ++--
 drivers/gpu/drm/i915/intel_region_ttm.c      | 31 +++++++++++++++-----
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
index a10716f4e717..358f8a1a30ce 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
@@ -58,11 +58,13 @@ i915_ttm_region(struct ttm_device *bdev, int ttm_mem_type)
 	struct drm_i915_private *i915 = container_of(bdev, typeof(*i915), bdev);
 
 	/* There's some room for optimization here... */
-	GEM_BUG_ON(ttm_mem_type != I915_PL_SYSTEM &&
-		   ttm_mem_type < I915_PL_LMEM0);
+	GEM_BUG_ON(ttm_mem_type == I915_PL_GGTT);
+
 	if (ttm_mem_type == I915_PL_SYSTEM)
 		return intel_memory_region_lookup(i915, INTEL_MEMORY_SYSTEM,
 						  0);
+	if (ttm_mem_type == I915_PL_STOLEN)
+		return i915->mm.stolen_region;
 
 	return intel_memory_region_lookup(i915, INTEL_MEMORY_LOCAL,
 					  ttm_mem_type - I915_PL_LMEM0);
diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c b/drivers/gpu/drm/i915/intel_region_ttm.c
index 62ff77445b01..7d49ea72e33f 100644
--- a/drivers/gpu/drm/i915/intel_region_ttm.c
+++ b/drivers/gpu/drm/i915/intel_region_ttm.c
@@ -49,7 +49,7 @@ void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv)
 
 /*
  * Map the i915 memory regions to TTM memory types. We use the
- * driver-private types for now, reserving TTM_PL_VRAM for stolen
+ * driver-private types for now, reserving I915_PL_STOLEN for stolen
  * memory and TTM_PL_TT for GGTT use if decided to implement this.
  */
 int intel_region_to_ttm_type(const struct intel_memory_region *mem)
@@ -58,11 +58,17 @@ int intel_region_to_ttm_type(const struct intel_memory_region *mem)
 
 	GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL &&
 		   mem->type != INTEL_MEMORY_MOCK &&
-		   mem->type != INTEL_MEMORY_SYSTEM);
+		   mem->type != INTEL_MEMORY_SYSTEM &&
+		   mem->type != INTEL_MEMORY_STOLEN_SYSTEM &&
+		   mem->type != INTEL_MEMORY_STOLEN_LOCAL);
 
 	if (mem->type == INTEL_MEMORY_SYSTEM)
 		return TTM_PL_SYSTEM;
 
+	if (mem->type == INTEL_MEMORY_STOLEN_SYSTEM ||
+	    mem->type == INTEL_MEMORY_STOLEN_LOCAL)
+		return I915_PL_STOLEN;
+
 	type = mem->instance + TTM_PL_PRIV;
 	GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES);
 
@@ -86,10 +92,16 @@ int intel_region_ttm_init(struct intel_memory_region *mem)
 	int mem_type = intel_region_to_ttm_type(mem);
 	int ret;
 
-	ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
-				      resource_size(&mem->region),
-				      mem->io_size,
-				      mem->min_page_size, PAGE_SIZE);
+	if (mem_type == I915_PL_STOLEN) {
+		ret = ttm_range_man_init(bdev, mem_type, false,
+					 resource_size(&mem->region) >> PAGE_SHIFT);
+		mem->is_range_manager = true;
+	} else {
+		ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
+					      resource_size(&mem->region),
+					      mem->io_size,
+					      mem->min_page_size, PAGE_SIZE);
+	}
 	if (ret)
 		return ret;
 
@@ -109,6 +121,7 @@ int intel_region_ttm_init(struct intel_memory_region *mem)
 int intel_region_ttm_fini(struct intel_memory_region *mem)
 {
 	struct ttm_resource_manager *man = mem->region_private;
+	int mem_type = intel_region_to_ttm_type(mem);
 	int ret = -EBUSY;
 	int count;
 
@@ -139,8 +152,10 @@ int intel_region_ttm_fini(struct intel_memory_region *mem)
 	if (ret || !man)
 		return ret;
 
-	ret = i915_ttm_buddy_man_fini(&mem->i915->bdev,
-				      intel_region_to_ttm_type(mem));
+	if (mem_type == I915_PL_STOLEN)
+		ret = ttm_range_man_fini(&mem->i915->bdev, mem_type);
+	else
+		ret = i915_ttm_buddy_man_fini(&mem->i915->bdev, mem_type);
 	GEM_WARN_ON(ret);
 	mem->region_private = NULL;
 
-- 
2.25.1