CPU mapping of split VRAM buffers

CPU mapping of split VRAM buffers

[Christian König]

Hi guys,

this set implements CPU mapping of split VRAM buffers and could
help with some performance issues regarding this.

Please review and/or comment,
Christian.

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH 1/6] drm/ttm: cleanup and optimize ttm_bo_mem_compat

[Christian König]

From: Christian König <christian.koenig@amd.com>

No need to implement the same logic twice. Also check if the busy placements
are identical to the already scanned placements before checking them.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 45 ++++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 989b98b..96b1450 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1046,29 +1046,17 @@ static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
 	return ret;
 }
 
-bool ttm_bo_mem_compat(struct ttm_placement *placement,
-		       struct ttm_mem_reg *mem,
-		       uint32_t *new_flags)
+static bool ttm_bo_places_compat(const struct ttm_place *places,
+				 unsigned num_placement,
+				 struct ttm_mem_reg *mem,
+				 uint32_t *new_flags)
 {
-	int i;
+	unsigned i;
 
-	for (i = 0; i < placement->num_placement; i++) {
-		const struct ttm_place *heap = &placement->placement[i];
-		if (mem->mm_node &&
-		    (mem->start < heap->fpfn ||
-		     (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
-			continue;
+	for (i = 0; i < num_placement; i++) {
+		const struct ttm_place *heap = &places[i];
 
-		*new_flags = heap->flags;
-		if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
-		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))
-			return true;
-	}
-
-	for (i = 0; i < placement->num_busy_placement; i++) {
-		const struct ttm_place *heap = &placement->busy_placement[i];
-		if (mem->mm_node &&
-		    (mem->start < heap->fpfn ||
+		if (mem->mm_node && (mem->start < heap->fpfn ||
 		     (heap->lpfn != 0 && (mem->start + mem->num_pages) > heap->lpfn)))
 			continue;
 
@@ -1077,6 +1065,23 @@ bool ttm_bo_mem_compat(struct ttm_placement *placement,
 		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))
 			return true;
 	}
+	return false;
+}
+
+bool ttm_bo_mem_compat(struct ttm_placement *placement,
+		       struct ttm_mem_reg *mem,
+		       uint32_t *new_flags)
+{
+	if (ttm_bo_places_compat(placement->placement, placement->num_placement,
+				 mem, new_flags))
+		return true;
+
+	if ((placement->busy_placement != placement->placement ||
+	     placement->num_busy_placement != placement->num_placement) &&
+	    ttm_bo_places_compat(placement->busy_placement,
+				 placement->num_busy_placement,
+				 mem, new_flags))
+		return true;
 
 	return false;
 }
-- 
2.5.0

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH 2/6] drm/ttm: add io_mem_pfn callback

[Christian König]

From: Christian König <christian.koenig@amd.com>

This allows the driver to handle io_mem mappings on their own.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |  1 +
 drivers/gpu/drm/ast/ast_ttm.c           |  1 +
 drivers/gpu/drm/bochs/bochs_mm.c        |  1 +
 drivers/gpu/drm/cirrus/cirrus_ttm.c     |  1 +
 drivers/gpu/drm/mgag200/mgag200_ttm.c   |  1 +
 drivers/gpu/drm/nouveau/nouveau_bo.c    |  1 +
 drivers/gpu/drm/qxl/qxl_ttm.c           |  1 +
 drivers/gpu/drm/radeon/radeon_ttm.c     |  1 +
 drivers/gpu/drm/ttm/ttm_bo_vm.c         | 10 +++++++++-
 drivers/gpu/drm/virtio/virtgpu_ttm.c    |  1 +
 drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c  |  1 +
 include/drm/ttm/ttm_bo_api.h            | 11 +++++++++++
 include/drm/ttm/ttm_bo_driver.h         |  9 +++++++++
 13 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 21876ee..7bf5ba7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1089,6 +1089,7 @@ static struct ttm_bo_driver amdgpu_bo_driver = {
 	.fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
 	.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
 	.io_mem_free = &amdgpu_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 int amdgpu_ttm_init(struct amdgpu_device *adev)
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index 50c910e..e879496 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -236,6 +236,7 @@ struct ttm_bo_driver ast_bo_driver = {
 	.verify_access = ast_bo_verify_access,
 	.io_mem_reserve = &ast_ttm_io_mem_reserve,
 	.io_mem_free = &ast_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 int ast_mm_init(struct ast_private *ast)
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index e4c1125..804afbc 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -205,6 +205,7 @@ struct ttm_bo_driver bochs_bo_driver = {
 	.verify_access = bochs_bo_verify_access,
 	.io_mem_reserve = &bochs_ttm_io_mem_reserve,
 	.io_mem_free = &bochs_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 int bochs_mm_init(struct bochs_device *bochs)
diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
index f53aa8f..93dbcd3 100644
--- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
+++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
@@ -236,6 +236,7 @@ struct ttm_bo_driver cirrus_bo_driver = {
 	.verify_access = cirrus_bo_verify_access,
 	.io_mem_reserve = &cirrus_ttm_io_mem_reserve,
 	.io_mem_free = &cirrus_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 int cirrus_mm_init(struct cirrus_device *cirrus)
diff --git a/drivers/gpu/drm/mgag200/mgag200_ttm.c b/drivers/gpu/drm/mgag200/mgag200_ttm.c
index 657598b..565a217 100644
--- a/drivers/gpu/drm/mgag200/mgag200_ttm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_ttm.c
@@ -236,6 +236,7 @@ struct ttm_bo_driver mgag200_bo_driver = {
 	.verify_access = mgag200_bo_verify_access,
 	.io_mem_reserve = &mgag200_ttm_io_mem_reserve,
 	.io_mem_free = &mgag200_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 int mgag200_mm_init(struct mga_device *mdev)
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 3949a74..978a5e7 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1570,6 +1570,7 @@ struct ttm_bo_driver nouveau_bo_driver = {
 	.fault_reserve_notify = &nouveau_ttm_fault_reserve_notify,
 	.io_mem_reserve = &nouveau_ttm_io_mem_reserve,
 	.io_mem_free = &nouveau_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 struct nvkm_vma *
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 2955f91..28fa56e 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -394,6 +394,7 @@ static struct ttm_bo_driver qxl_bo_driver = {
 	.verify_access = &qxl_verify_access,
 	.io_mem_reserve = &qxl_ttm_io_mem_reserve,
 	.io_mem_free = &qxl_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 	.move_notify = &qxl_bo_move_notify,
 };
 
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 6571384..d07ff84 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -873,6 +873,7 @@ static struct ttm_bo_driver radeon_bo_driver = {
 	.fault_reserve_notify = &radeon_bo_fault_reserve_notify,
 	.io_mem_reserve = &radeon_ttm_io_mem_reserve,
 	.io_mem_free = &radeon_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
 
 int radeon_ttm_init(struct radeon_device *rdev)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 750733a..be84e3dc 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -231,7 +231,7 @@ static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 	 */
 	for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
 		if (bo->mem.bus.is_iomem)
-			pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset;
+			pfn = bdev->driver->io_mem_pfn(bo, page_offset);
 		else {
 			page = ttm->pages[page_offset];
 			if (unlikely(!page && i == 0)) {
@@ -324,6 +324,14 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
 	return bo;
 }
 
+unsigned long ttm_bo_default_io_mem_pfn(struct ttm_buffer_object *bo,
+					unsigned long page_offset)
+{
+	return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT)
+		+ page_offset;
+}
+EXPORT_SYMBOL(ttm_bo_default_io_mem_pfn);
+
 int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
 		struct ttm_bo_device *bdev)
 {
diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c b/drivers/gpu/drm/virtio/virtgpu_ttm.c
index a8875a7..8b76bf9 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ttm.c
@@ -432,6 +432,7 @@ static struct ttm_bo_driver virtio_gpu_bo_driver = {
 	.verify_access = &virtio_gpu_verify_access,
 	.io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
 	.io_mem_free = &virtio_gpu_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 	.move_notify = &virtio_gpu_bo_move_notify,
 	.swap_notify = &virtio_gpu_bo_swap_notify,
 };
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
index 1de9669..ba2fa7b 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -859,4 +859,5 @@ struct ttm_bo_driver vmw_bo_driver = {
 	.fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
 	.io_mem_reserve = &vmw_ttm_io_mem_reserve,
 	.io_mem_free = &vmw_ttm_io_mem_free,
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
 };
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 2d0f63e..3b302a5 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -724,6 +724,17 @@ extern int ttm_fbdev_mmap(struct vm_area_struct *vma,
 			  struct ttm_buffer_object *bo);
 
 /**
+ * ttm_bo_default_iomem_pfn - get a pfn for a page offset
+ *
+ * @bo: the BO we need to look up the pfn for
+ * @page_offset: offset inside the BO to look up.
+ *
+ * Calculate the PFN for iomem based mappings during page fault
+ */
+unsigned long ttm_bo_default_io_mem_pfn(struct ttm_buffer_object *bo,
+				        unsigned long page_offset);
+
+/**
  * ttm_bo_mmap - mmap out of the ttm device address space.
  *
  * @filp:      filp as input from the mmap method.
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 7777d14..cb5072a 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -462,6 +462,15 @@ struct ttm_bo_driver {
 			      struct ttm_mem_reg *mem);
 	void (*io_mem_free)(struct ttm_bo_device *bdev,
 			    struct ttm_mem_reg *mem);
+
+	/**
+	 * Return the pfn for a given page_offset inside the BO.
+	 *
+	 * @bo: the BO to look up the pfn for
+	 * @page_offset: the offset to look up
+	 */
+	unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
+				    unsigned long page_offset);
 };
 
 /**
-- 
2.5.0

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH 3/6] drm/ttm: add TTM_PL_FLAG_CONTIGUOUS

[Christian König]

From: Christian König <christian.koenig@amd.com>

This allows drivers to specify if they need a contiguous allocation or not.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c    | 4 +++-
 include/drm/ttm/ttm_placement.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 96b1450..35c12c7 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1062,7 +1062,9 @@ static bool ttm_bo_places_compat(const struct ttm_place *places,
 
 		*new_flags = heap->flags;
 		if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&
-		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))
+		    (*new_flags & mem->placement & TTM_PL_MASK_MEM) &&
+		    (!(*new_flags & TTM_PL_FLAG_CONTIGUOUS) ||
+		     (mem->placement & TTM_PL_FLAG_CONTIGUOUS)))
 			return true;
 	}
 	return false;
diff --git a/include/drm/ttm/ttm_placement.h b/include/drm/ttm/ttm_placement.h
index 932be0c..40f947f 100644
--- a/include/drm/ttm/ttm_placement.h
+++ b/include/drm/ttm/ttm_placement.h
@@ -63,6 +63,7 @@
 #define TTM_PL_FLAG_CACHED      (1 << 16)
 #define TTM_PL_FLAG_UNCACHED    (1 << 17)
 #define TTM_PL_FLAG_WC          (1 << 18)
+#define TTM_PL_FLAG_CONTIGUOUS	(1 << 19)
 #define TTM_PL_FLAG_NO_EVICT    (1 << 21)
 #define TTM_PL_FLAG_TOPDOWN     (1 << 22)
 
-- 
2.5.0

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH 4/6] drm/amdgpu: drop alpha support

[Christian König]

From: Christian König <christian.koenig@amd.com>

We will probably never see this combination.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
 1 file changed, 25 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 7bf5ba7..524abca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
 			return -EINVAL;
 		mem->bus.base = adev->mc.aper_base;
 		mem->bus.is_iomem = true;
-#ifdef __alpha__
-		/*
-		 * Alpha: use bus.addr to hold the ioremap() return,
-		 * so we can modify bus.base below.
-		 */
-		if (mem->placement & TTM_PL_FLAG_WC)
-			mem->bus.addr =
-				ioremap_wc(mem->bus.base + mem->bus.offset,
-					   mem->bus.size);
-		else
-			mem->bus.addr =
-				ioremap_nocache(mem->bus.base + mem->bus.offset,
-						mem->bus.size);
-		if (!mem->bus.addr)
-			return -ENOMEM;
-
-		/*
-		 * Alpha: Use just the bus offset plus
-		 * the hose/domain memory base for bus.base.
-		 * It then can be used to build PTEs for VRAM
-		 * access, as done in ttm_bo_vm_fault().
-		 */
-		mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
-			adev->ddev->hose->dense_mem_base;
-#endif
 		break;
 	default:
 		return -EINVAL;
-- 
2.5.0

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH 5/6] drm/amdgpu: use TTM_PL_FLAG_CONTIGUOUS

[Christian König]

From: Christian König <christian.koenig@amd.com>

Implement AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS using TTM_PL_FLAG_CONTIGUOUS
instead of a placement limit. That allows us to better handle CPU
accessible placements.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c   | 11 +++++------
 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 14 ++++++++++----
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index d6b2de9..387d190 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -122,20 +122,19 @@ static void amdgpu_ttm_placement_init(struct amdgpu_device *adev,
 
 	if (domain & AMDGPU_GEM_DOMAIN_VRAM) {
 		unsigned visible_pfn = adev->mc.visible_vram_size >> PAGE_SHIFT;
-		unsigned lpfn = 0;
-
-		/* This forces a reallocation if the flag wasn't set before */
-		if (flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)
-			lpfn = adev->mc.real_vram_size >> PAGE_SHIFT;
 
 		places[c].fpfn = 0;
-		places[c].lpfn = lpfn;
+		places[c].lpfn = 0;
 		places[c].flags = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED |
 			TTM_PL_FLAG_VRAM;
+
 		if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED)
 			places[c].lpfn = visible_pfn;
 		else
 			places[c].flags |= TTM_PL_FLAG_TOPDOWN;
+
+		if (flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)
+			places[c].flags |= TTM_PL_FLAG_CONTIGUOUS;
 		c++;
 	}
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index d710226..af2d172 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -93,7 +93,6 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
 			       const struct ttm_place *place,
 			       struct ttm_mem_reg *mem)
 {
-	struct amdgpu_bo *bo = container_of(tbo, struct amdgpu_bo, tbo);
 	struct amdgpu_vram_mgr *mgr = man->priv;
 	struct drm_mm *mm = &mgr->mm;
 	struct drm_mm_node *nodes;
@@ -107,8 +106,8 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
 	if (!lpfn)
 		lpfn = man->size;
 
-	if (bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS ||
-	    place->lpfn || amdgpu_vram_page_split == -1) {
+	if (place->flags & TTM_PL_FLAG_CONTIGUOUS ||
+	    amdgpu_vram_page_split == -1) {
 		pages_per_node = ~0ul;
 		num_nodes = 1;
 	} else {
@@ -126,12 +125,14 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
 		aflags = DRM_MM_CREATE_TOP;
 	}
 
+	mem->start = 0;
 	pages_left = mem->num_pages;
 
 	spin_lock(&mgr->lock);
 	for (i = 0; i < num_nodes; ++i) {
 		unsigned long pages = min(pages_left, pages_per_node);
 		uint32_t alignment = mem->page_alignment;
+		unsigned long start;
 
 		if (pages == pages_per_node)
 			alignment = pages_per_node;
@@ -145,11 +146,16 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
 		if (unlikely(r))
 			goto error;
 
+		/*
+		 * Calculate a virtual BO start address to easily check if
+		 * everything is CPU accessible.
+		 */
+		start = nodes[i].start + nodes[i].size - mem->num_pages;
+		mem->start = max(mem->start, start);
 		pages_left -= pages;
 	}
 	spin_unlock(&mgr->lock);
 
-	mem->start = num_nodes == 1 ? nodes[0].start : AMDGPU_BO_INVALID_OFFSET;
 	mem->mm_node = nodes;
 
 	return 0;
-- 
2.5.0

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

[PATCH 6/6] drm/amdgpu: handle CPU access for split VRAM buffers

[Christian König]

From: Christian König <christian.koenig@amd.com>

This avoids merging them together on page fault.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |  4 +---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 16 ++++++++++++----
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 387d190..10237a8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -927,8 +927,7 @@ int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
 	size = bo->mem.num_pages << PAGE_SHIFT;
 	offset = bo->mem.start << PAGE_SHIFT;
 	/* TODO: figure out how to map scattered VRAM to the CPU */
-	if ((offset + size) <= adev->mc.visible_vram_size &&
-	    (abo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS))
+	if ((offset + size) <= adev->mc.visible_vram_size)
 		return 0;
 
 	/* Can't move a pinned BO to visible VRAM */
@@ -936,7 +935,6 @@ int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
 		return -EINVAL;
 
 	/* hurrah the memory is not visible ! */
-	abo->flags |= AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
 	amdgpu_ttm_placement_from_domain(abo, AMDGPU_GEM_DOMAIN_VRAM);
 	lpfn =	adev->mc.visible_vram_size >> PAGE_SHIFT;
 	for (i = 0; i < abo->placement.num_placement; i++) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 524abca..10b793a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -529,9 +529,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
 	case TTM_PL_TT:
 		break;
 	case TTM_PL_VRAM:
-		if (mem->start == AMDGPU_BO_INVALID_OFFSET)
-			return -EINVAL;
-
 		mem->bus.offset = mem->start << PAGE_SHIFT;
 		/* check if it's visible */
 		if ((mem->bus.offset + mem->bus.size) > adev->mc.visible_vram_size)
@@ -549,6 +546,17 @@ static void amdgpu_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_re
 {
 }
 
+static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
+					   unsigned long page_offset)
+{
+	struct drm_mm_node *mm = bo->mem.mm_node;
+	uint64_t size = mm->size;
+
+	mm += page_offset / size;
+	page_offset %= size;
+	return (bo->mem.bus.base >> PAGE_SHIFT) + mm->start + page_offset;
+}
+
 /*
  * TTM backend functions.
  */
@@ -1064,7 +1072,7 @@ static struct ttm_bo_driver amdgpu_bo_driver = {
 	.fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
 	.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
 	.io_mem_free = &amdgpu_ttm_io_mem_free,
-	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
+	.io_mem_pfn = amdgpu_ttm_io_mem_pfn,
 };
 
 int amdgpu_ttm_init(struct amdgpu_device *adev)
-- 
2.5.0

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

RE: CPU mapping of split VRAM buffers

[Deucher, Alexander]

> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces@lists.freedesktop.org] On Behalf
> Of Christian König
> Sent: Wednesday, March 29, 2017 8:56 AM
> To: amd-gfx@lists.freedesktop.org
> Cc: maraeo@gmail.com
> Subject: CPU mapping of split VRAM buffers
> 
> Hi guys,
> 
> this set implements CPU mapping of split VRAM buffers and could
> help with some performance issues regarding this.
> 
> Please review and/or comment,

Should probably resend them to dri-devel as well since they touch core ttm.

Alex

> Christian.
> 
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

Re: CPU mapping of split VRAM buffers

[Christian König]

Am 29.03.2017 um 17:36 schrieb Deucher, Alexander:
>> -----Original Message-----
>> From: amd-gfx [mailto:amd-gfx-bounces@lists.freedesktop.org] On Behalf
>> Of Christian König
>> Sent: Wednesday, March 29, 2017 8:56 AM
>> To: amd-gfx@lists.freedesktop.org
>> Cc: maraeo@gmail.com
>> Subject: CPU mapping of split VRAM buffers
>>
>> Hi guys,
>>
>> this set implements CPU mapping of split VRAM buffers and could
>> help with some performance issues regarding this.
>>
>> Please review and/or comment,
> Should probably resend them to dri-devel as well since they touch core ttm.

Ups, indeed. Just fixed that.

Christian.

>
> Alex
>
>> Christian.
>>
>> _______________________________________________
>> amd-gfx mailing list
>> amd-gfx@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx


_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

Re: [PATCH 1/6] drm/ttm: cleanup and optimize ttm_bo_mem_compat

[Michel Dänzer]

On 29/03/17 09:55 PM, Christian König wrote:
> From: Christian König <christian.koenig@amd.com>
> 
> No need to implement the same logic twice. Also check if the busy placements
> are identical to the already scanned placements before checking them.
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>

[...]

> @@ -1077,6 +1065,23 @@ bool ttm_bo_mem_compat(struct ttm_placement *placement,
>  		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))
>  			return true;
>  	}
> +	return false;
> +}
> +
> +bool ttm_bo_mem_compat(struct ttm_placement *placement,
> +		       struct ttm_mem_reg *mem,
> +		       uint32_t *new_flags)
> +{
> +	if (ttm_bo_places_compat(placement->placement, placement->num_placement,
> +				 mem, new_flags))
> +		return true;
> +
> +	if ((placement->busy_placement != placement->placement ||
> +	     placement->num_busy_placement != placement->num_placement) &&

	     placement->num_busy_placement > placement->num_placement) &&

?


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 3/6] drm/ttm: add TTM_PL_FLAG_CONTIGUOUS

[Michel Dänzer]

On 29/03/17 09:55 PM, Christian König wrote:
> From: Christian König <christian.koenig@amd.com>
> 
> This allows drivers to specify if they need a contiguous allocation or not.
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>

[...]

> diff --git a/include/drm/ttm/ttm_placement.h b/include/drm/ttm/ttm_placement.h
> index 932be0c..40f947f 100644
> --- a/include/drm/ttm/ttm_placement.h
> +++ b/include/drm/ttm/ttm_placement.h
> @@ -63,6 +63,7 @@
>  #define TTM_PL_FLAG_CACHED      (1 << 16)
>  #define TTM_PL_FLAG_UNCACHED    (1 << 17)
>  #define TTM_PL_FLAG_WC          (1 << 18)
> +#define TTM_PL_FLAG_CONTIGUOUS	(1 << 19)

The value on this line doesn't line up, because it uses a tab instead of
spaces.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

Re: [PATCH 4/6] drm/amdgpu: drop alpha support

[Michel Dänzer]

On 29/03/17 09:55 PM, Christian König wrote:
> From: Christian König <christian.koenig@amd.com>
> 
> We will probably never see this combination.
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
>  1 file changed, 25 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 7bf5ba7..524abca 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
>  			return -EINVAL;
>  		mem->bus.base = adev->mc.aper_base;
>  		mem->bus.is_iomem = true;
> -#ifdef __alpha__
> -		/*
> -		 * Alpha: use bus.addr to hold the ioremap() return,
> -		 * so we can modify bus.base below.
> -		 */
> -		if (mem->placement & TTM_PL_FLAG_WC)
> -			mem->bus.addr =
> -				ioremap_wc(mem->bus.base + mem->bus.offset,
> -					   mem->bus.size);
> -		else
> -			mem->bus.addr =
> -				ioremap_nocache(mem->bus.base + mem->bus.offset,
> -						mem->bus.size);
> -		if (!mem->bus.addr)
> -			return -ENOMEM;
> -
> -		/*
> -		 * Alpha: Use just the bus offset plus
> -		 * the hose/domain memory base for bus.base.
> -		 * It then can be used to build PTEs for VRAM
> -		 * access, as done in ttm_bo_vm_fault().
> -		 */
> -		mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
> -			adev->ddev->hose->dense_mem_base;
> -#endif
>  		break;
>  	default:
>  		return -EINVAL;
> 

Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
to prevent somebody from trying this driver on an Alpha machine, and it
mysteriously failing due to the lack of this?

Either way,

Acked-by: Michel Dänzer <michel.daenzer@amd.com>


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 2/6] drm/ttm: add io_mem_pfn callback

[Michel Dänzer]

On 29/03/17 09:55 PM, Christian König wrote:
> From: Christian König <christian.koenig@amd.com>
> 
> This allows the driver to handle io_mem mappings on their own.
> 
> Signed-off-by: Christian König <christian.koenig@amd.com>

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: CPU mapping of split VRAM buffers

[Michel Dänzer]

On 29/03/17 09:55 PM, Christian König wrote:
> Hi guys,
> 
> this set implements CPU mapping of split VRAM buffers and could
> help with some performance issues regarding this.
> 
> Please review and/or comment,

Patches 5 & 6 look mostly good to me, but I don't fully understand all
changes in there, so I only feel comfortable giving

Acked-by: Michel Dänzer <michel.daenzer@amd.com>

for them.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 1/6] drm/ttm: cleanup and optimize ttm_bo_mem_compat

[Christian König]

Am 30.03.2017 um 08:38 schrieb Michel Dänzer:
> On 29/03/17 09:55 PM, Christian König wrote:
>> From: Christian König <christian.koenig@amd.com>
>>
>> No need to implement the same logic twice. Also check if the busy placements
>> are identical to the already scanned placements before checking them.
>>
>> Signed-off-by: Christian König <christian.koenig@amd.com>
> [...]
>
>> @@ -1077,6 +1065,23 @@ bool ttm_bo_mem_compat(struct ttm_placement *placement,
>>   		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))
>>   			return true;
>>   	}
>> +	return false;
>> +}
>> +
>> +bool ttm_bo_mem_compat(struct ttm_placement *placement,
>> +		       struct ttm_mem_reg *mem,
>> +		       uint32_t *new_flags)
>> +{
>> +	if (ttm_bo_places_compat(placement->placement, placement->num_placement,
>> +				 mem, new_flags))
>> +		return true;
>> +
>> +	if ((placement->busy_placement != placement->placement ||
>> +	     placement->num_busy_placement != placement->num_placement) &&
> 	     placement->num_busy_placement > placement->num_placement) &&
>
> ?

Good idea.

Christian.

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx

Re: [PATCH 4/6] drm/amdgpu: drop alpha support

[Alex Deucher]

On Thu, Mar 30, 2017 at 2:39 AM, Michel Dänzer <michel@daenzer.net> wrote:
> On 29/03/17 09:55 PM, Christian König wrote:
>> From: Christian König <christian.koenig@amd.com>
>>
>> We will probably never see this combination.
>>
>> Signed-off-by: Christian König <christian.koenig@amd.com>
>> ---
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
>>  1 file changed, 25 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> index 7bf5ba7..524abca 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>> @@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
>>                       return -EINVAL;
>>               mem->bus.base = adev->mc.aper_base;
>>               mem->bus.is_iomem = true;
>> -#ifdef __alpha__
>> -             /*
>> -              * Alpha: use bus.addr to hold the ioremap() return,
>> -              * so we can modify bus.base below.
>> -              */
>> -             if (mem->placement & TTM_PL_FLAG_WC)
>> -                     mem->bus.addr =
>> -                             ioremap_wc(mem->bus.base + mem->bus.offset,
>> -                                        mem->bus.size);
>> -             else
>> -                     mem->bus.addr =
>> -                             ioremap_nocache(mem->bus.base + mem->bus.offset,
>> -                                             mem->bus.size);
>> -             if (!mem->bus.addr)
>> -                     return -ENOMEM;
>> -
>> -             /*
>> -              * Alpha: Use just the bus offset plus
>> -              * the hose/domain memory base for bus.base.
>> -              * It then can be used to build PTEs for VRAM
>> -              * access, as done in ttm_bo_vm_fault().
>> -              */
>> -             mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
>> -                     adev->ddev->hose->dense_mem_base;
>> -#endif
>>               break;
>>       default:
>>               return -EINVAL;
>>
>
> Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
> to prevent somebody from trying this driver on an Alpha machine, and it
> mysteriously failing due to the lack of this?
>
> Either way,
>
> Acked-by: Michel Dänzer <michel.daenzer@amd.com>

Does this code even work on alpha (or compile for that matter)?  I
think this was blindly copied over from radeon UMS to radeon KMS to
amdgpu.

Alex

>
>
> --
> Earthling Michel Dänzer               |               http://www.amd.com
> Libre software enthusiast             |             Mesa and X developer
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 4/6] drm/amdgpu: drop alpha support

[Christian König]

Am 30.03.2017 um 15:09 schrieb Alex Deucher:
> On Thu, Mar 30, 2017 at 2:39 AM, Michel Dänzer <michel@daenzer.net> wrote:
>> On 29/03/17 09:55 PM, Christian König wrote:
>>> From: Christian König <christian.koenig@amd.com>
>>>
>>> We will probably never see this combination.
>>>
>>> Signed-off-by: Christian König <christian.koenig@amd.com>
>>> ---
>>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
>>>   1 file changed, 25 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> index 7bf5ba7..524abca 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> @@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
>>>                        return -EINVAL;
>>>                mem->bus.base = adev->mc.aper_base;
>>>                mem->bus.is_iomem = true;
>>> -#ifdef __alpha__
>>> -             /*
>>> -              * Alpha: use bus.addr to hold the ioremap() return,
>>> -              * so we can modify bus.base below.
>>> -              */
>>> -             if (mem->placement & TTM_PL_FLAG_WC)
>>> -                     mem->bus.addr =
>>> -                             ioremap_wc(mem->bus.base + mem->bus.offset,
>>> -                                        mem->bus.size);
>>> -             else
>>> -                     mem->bus.addr =
>>> -                             ioremap_nocache(mem->bus.base + mem->bus.offset,
>>> -                                             mem->bus.size);
>>> -             if (!mem->bus.addr)
>>> -                     return -ENOMEM;
>>> -
>>> -             /*
>>> -              * Alpha: Use just the bus offset plus
>>> -              * the hose/domain memory base for bus.base.
>>> -              * It then can be used to build PTEs for VRAM
>>> -              * access, as done in ttm_bo_vm_fault().
>>> -              */
>>> -             mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
>>> -                     adev->ddev->hose->dense_mem_base;
>>> -#endif
>>>                break;
>>>        default:
>>>                return -EINVAL;
>>>
>> Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
>> to prevent somebody from trying this driver on an Alpha machine, and it
>> mysteriously failing due to the lack of this?
>>
>> Either way,
>>
>> Acked-by: Michel Dänzer <michel.daenzer@amd.com>
> Does this code even work on alpha (or compile for that matter)?  I
> think this was blindly copied over from radeon UMS to radeon KMS to
> amdgpu.

Yeah, I was questioning that myself as well.

I'm fine adding a !ALPHA to the Kconfig, but I'm quite sure that 
architecture is just dead.

Christian.

>
> Alex
>
>>
>> --
>> Earthling Michel Dänzer               |               http://www.amd.com
>> Libre software enthusiast             |             Mesa and X developer
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel


_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 4/6] drm/amdgpu: drop alpha support

[Michel Dänzer]

On 30/03/17 10:09 PM, Alex Deucher wrote:
> On Thu, Mar 30, 2017 at 2:39 AM, Michel Dänzer <michel@daenzer.net> wrote:
>> On 29/03/17 09:55 PM, Christian König wrote:
>>> From: Christian König <christian.koenig@amd.com>
>>>
>>> We will probably never see this combination.
>>>
>>> Signed-off-by: Christian König <christian.koenig@amd.com>
>>> ---
>>>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
>>>  1 file changed, 25 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> index 7bf5ba7..524abca 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> @@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
>>>                       return -EINVAL;
>>>               mem->bus.base = adev->mc.aper_base;
>>>               mem->bus.is_iomem = true;
>>> -#ifdef __alpha__
>>> -             /*
>>> -              * Alpha: use bus.addr to hold the ioremap() return,
>>> -              * so we can modify bus.base below.
>>> -              */
>>> -             if (mem->placement & TTM_PL_FLAG_WC)
>>> -                     mem->bus.addr =
>>> -                             ioremap_wc(mem->bus.base + mem->bus.offset,
>>> -                                        mem->bus.size);
>>> -             else
>>> -                     mem->bus.addr =
>>> -                             ioremap_nocache(mem->bus.base + mem->bus.offset,
>>> -                                             mem->bus.size);
>>> -             if (!mem->bus.addr)
>>> -                     return -ENOMEM;
>>> -
>>> -             /*
>>> -              * Alpha: Use just the bus offset plus
>>> -              * the hose/domain memory base for bus.base.
>>> -              * It then can be used to build PTEs for VRAM
>>> -              * access, as done in ttm_bo_vm_fault().
>>> -              */
>>> -             mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
>>> -                     adev->ddev->hose->dense_mem_base;
>>> -#endif
>>>               break;
>>>       default:
>>>               return -EINVAL;
>>>
>>
>> Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
>> to prevent somebody from trying this driver on an Alpha machine, and it
>> mysteriously failing due to the lack of this?
>>
>> Either way,
>>
>> Acked-by: Michel Dänzer <michel.daenzer@amd.com>
> 
> Does this code even work on alpha (or compile for that matter)?

If it doesn't compile, that makes it obvious to somebody who tries
compiling it on Alpha that there's something wrong. Whereas if we just
remove it, the driver might build but probably won't work.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 4/6] drm/amdgpu: drop alpha support

[Christian König]

Am 31.03.2017 um 03:07 schrieb Michel Dänzer:
> On 30/03/17 10:09 PM, Alex Deucher wrote:
>> On Thu, Mar 30, 2017 at 2:39 AM, Michel Dänzer <michel@daenzer.net> wrote:
>>> On 29/03/17 09:55 PM, Christian König wrote:
>>>> From: Christian König <christian.koenig@amd.com>
>>>>
>>>> We will probably never see this combination.
>>>>
>>>> Signed-off-by: Christian König <christian.koenig@amd.com>
>>>> ---
>>>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
>>>>   1 file changed, 25 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>> index 7bf5ba7..524abca 100644
>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>> @@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
>>>>                        return -EINVAL;
>>>>                mem->bus.base = adev->mc.aper_base;
>>>>                mem->bus.is_iomem = true;
>>>> -#ifdef __alpha__
>>>> -             /*
>>>> -              * Alpha: use bus.addr to hold the ioremap() return,
>>>> -              * so we can modify bus.base below.
>>>> -              */
>>>> -             if (mem->placement & TTM_PL_FLAG_WC)
>>>> -                     mem->bus.addr =
>>>> -                             ioremap_wc(mem->bus.base + mem->bus.offset,
>>>> -                                        mem->bus.size);
>>>> -             else
>>>> -                     mem->bus.addr =
>>>> -                             ioremap_nocache(mem->bus.base + mem->bus.offset,
>>>> -                                             mem->bus.size);
>>>> -             if (!mem->bus.addr)
>>>> -                     return -ENOMEM;
>>>> -
>>>> -             /*
>>>> -              * Alpha: Use just the bus offset plus
>>>> -              * the hose/domain memory base for bus.base.
>>>> -              * It then can be used to build PTEs for VRAM
>>>> -              * access, as done in ttm_bo_vm_fault().
>>>> -              */
>>>> -             mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
>>>> -                     adev->ddev->hose->dense_mem_base;
>>>> -#endif
>>>>                break;
>>>>        default:
>>>>                return -EINVAL;
>>>>
>>> Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
>>> to prevent somebody from trying this driver on an Alpha machine, and it
>>> mysteriously failing due to the lack of this?
>>>
>>> Either way,
>>>
>>> Acked-by: Michel Dänzer <michel.daenzer@amd.com>
>> Does this code even work on alpha (or compile for that matter)?
> If it doesn't compile, that makes it obvious to somebody who tries
> compiling it on Alpha that there's something wrong. Whereas if we just
> remove it, the driver might build but probably won't work.

According to Wikipedia the last Alpha was build in 2004, the first GCN 1 
hardware we support shipped in 2014.

That's a decade between those and I have strong doubts that any Alpha 
board has physically PCIe compatible slots.

Anyway, I will just add a !ALPHA to Kconfig.

Christian.


_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 4/6] drm/amdgpu: drop alpha support

[Michel Dänzer]

On 31/03/17 04:09 PM, Christian König wrote:
> Am 31.03.2017 um 03:07 schrieb Michel Dänzer:
>> On 30/03/17 10:09 PM, Alex Deucher wrote:
>>> On Thu, Mar 30, 2017 at 2:39 AM, Michel Dänzer <michel@daenzer.net>
>>> wrote:
>>>> On 29/03/17 09:55 PM, Christian König wrote:
>>>>> From: Christian König <christian.koenig@amd.com>
>>>>>
>>>>> We will probably never see this combination.
>>>>>
>>>>> Signed-off-by: Christian König <christian.koenig@amd.com>
>>>>> ---
>>>>>   drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25
>>>>> -------------------------
>>>>>   1 file changed, 25 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>>> index 7bf5ba7..524abca 100644
>>>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>>>> @@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct
>>>>> ttm_bo_device *bdev, struct ttm_mem_
>>>>>                        return -EINVAL;
>>>>>                mem->bus.base = adev->mc.aper_base;
>>>>>                mem->bus.is_iomem = true;
>>>>> -#ifdef __alpha__
>>>>> -             /*
>>>>> -              * Alpha: use bus.addr to hold the ioremap() return,
>>>>> -              * so we can modify bus.base below.
>>>>> -              */
>>>>> -             if (mem->placement & TTM_PL_FLAG_WC)
>>>>> -                     mem->bus.addr =
>>>>> -                             ioremap_wc(mem->bus.base +
>>>>> mem->bus.offset,
>>>>> -                                        mem->bus.size);
>>>>> -             else
>>>>> -                     mem->bus.addr =
>>>>> -                             ioremap_nocache(mem->bus.base +
>>>>> mem->bus.offset,
>>>>> -                                             mem->bus.size);
>>>>> -             if (!mem->bus.addr)
>>>>> -                     return -ENOMEM;
>>>>> -
>>>>> -             /*
>>>>> -              * Alpha: Use just the bus offset plus
>>>>> -              * the hose/domain memory base for bus.base.
>>>>> -              * It then can be used to build PTEs for VRAM
>>>>> -              * access, as done in ttm_bo_vm_fault().
>>>>> -              */
>>>>> -             mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
>>>>> -                     adev->ddev->hose->dense_mem_base;
>>>>> -#endif
>>>>>                break;
>>>>>        default:
>>>>>                return -EINVAL;
>>>>>
>>>> Maybe leave an #error line, or make AMDGPU depend on !ALPHA in Kconfig,
>>>> to prevent somebody from trying this driver on an Alpha machine, and it
>>>> mysteriously failing due to the lack of this?
>>>>
>>>> Either way,
>>>>
>>>> Acked-by: Michel Dänzer <michel.daenzer@amd.com>
>>> Does this code even work on alpha (or compile for that matter)?
>> If it doesn't compile, that makes it obvious to somebody who tries
>> compiling it on Alpha that there's something wrong. Whereas if we just
>> remove it, the driver might build but probably won't work.
> 
> According to Wikipedia the last Alpha was build in 2004, the first GCN 1
> hardware we support shipped in 2014.
> 
> That's a decade between those and I have strong doubts that any Alpha
> board has physically PCIe compatible slots.

That's a good point about PCIe.

 git grep -i PCIe arch/alpha

in the kernel tree doesn't turn up anything.


> Anyway, I will just add a !ALPHA to Kconfig.

You've convinced me it's not necessary. The patch is

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

as is.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH 4/6] drm/amdgpu: drop alpha support

[Christian König]

From: Christian König <christian.koenig@amd.com>

We will probably never see this combination.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
 1 file changed, 25 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 7bf5ba7..524abca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
 			return -EINVAL;
 		mem->bus.base = adev->mc.aper_base;
 		mem->bus.is_iomem = true;
-#ifdef __alpha__
-		/*
-		 * Alpha: use bus.addr to hold the ioremap() return,
-		 * so we can modify bus.base below.
-		 */
-		if (mem->placement & TTM_PL_FLAG_WC)
-			mem->bus.addr =
-				ioremap_wc(mem->bus.base + mem->bus.offset,
-					   mem->bus.size);
-		else
-			mem->bus.addr =
-				ioremap_nocache(mem->bus.base + mem->bus.offset,
-						mem->bus.size);
-		if (!mem->bus.addr)
-			return -ENOMEM;
-
-		/*
-		 * Alpha: Use just the bus offset plus
-		 * the hose/domain memory base for bus.base.
-		 * It then can be used to build PTEs for VRAM
-		 * access, as done in ttm_bo_vm_fault().
-		 */
-		mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
-			adev->ddev->hose->dense_mem_base;
-#endif
 		break;
 	default:
 		return -EINVAL;
-- 
2.5.0

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

[PATCH 4/6] drm/amdgpu: drop alpha support

[Christian König]

From: Christian König <christian.koenig@amd.com>

We will probably never see this combination.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 25 -------------------------
 1 file changed, 25 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 7bf5ba7..524abca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -538,31 +538,6 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
 			return -EINVAL;
 		mem->bus.base = adev->mc.aper_base;
 		mem->bus.is_iomem = true;
-#ifdef __alpha__
-		/*
-		 * Alpha: use bus.addr to hold the ioremap() return,
-		 * so we can modify bus.base below.
-		 */
-		if (mem->placement & TTM_PL_FLAG_WC)
-			mem->bus.addr =
-				ioremap_wc(mem->bus.base + mem->bus.offset,
-					   mem->bus.size);
-		else
-			mem->bus.addr =
-				ioremap_nocache(mem->bus.base + mem->bus.offset,
-						mem->bus.size);
-		if (!mem->bus.addr)
-			return -ENOMEM;
-
-		/*
-		 * Alpha: Use just the bus offset plus
-		 * the hose/domain memory base for bus.base.
-		 * It then can be used to build PTEs for VRAM
-		 * access, as done in ttm_bo_vm_fault().
-		 */
-		mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
-			adev->ddev->hose->dense_mem_base;
-#endif
 		break;
 	default:
 		return -EINVAL;
-- 
2.5.0

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel