[PATCH v3 0/8] do not store GPU address in TTM

[PATCH v3 0/8] do not store GPU address in TTM

[Nirmoy Das]

With this patch series I am trying to remove GPU address dependency in
TTM and moving GPU address calculation to individual drm drivers.

I tested this patch series on qxl, bochs and amdgpu. Christian tested it on radeon HW.
It would be nice if someone test this for nouveau and vmgfx.

v2:
* set bo->offset = 0 for drm/nouveau if bo->mem.mm_node == NULL

v3:
* catch return value of drm_gem_vram_offset() in drm/bochs
* introduce drm_gem_vram_pg_offset() in vram helper
* improve nbo->offset calculation for nouveau

Nirmoy Das (8):
  drm/amdgpu: move ttm bo->offset to amdgpu_bo
  drm/radeon: don't use ttm bo->offset
  drm/vmwgfx: don't use ttm bo->offset
  drm/nouveau: don't use ttm bo->offset
  drm/qxl: don't use ttm bo->offset
  drm/vram-helper: don't use ttm bo->offset
  drm/bochs: use drm_gem_vram_offset to get bo offset
  drm/ttm: do not keep GPU dependent addresses

 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c  | 22 ++++++++++++++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h  |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c     | 29 ++++++++++++++++-----
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h     |  1 +
 drivers/gpu/drm/bochs/bochs_kms.c           |  2 +-
 drivers/gpu/drm/drm_gem_vram_helper.c       |  2 +-
 drivers/gpu/drm/nouveau/dispnv04/crtc.c     |  6 ++---
 drivers/gpu/drm/nouveau/dispnv04/disp.c     |  2 +-
 drivers/gpu/drm/nouveau/dispnv04/overlay.c  |  6 ++---
 drivers/gpu/drm/nouveau/dispnv50/base507c.c |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/core507d.c |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/ovly507e.c |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/wndw.c     |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c |  2 +-
 drivers/gpu/drm/nouveau/nouveau_abi16.c     |  8 +++---
 drivers/gpu/drm/nouveau/nouveau_bo.c        |  1 +
 drivers/gpu/drm/nouveau/nouveau_bo.h        |  3 +++
 drivers/gpu/drm/nouveau/nouveau_chan.c      |  2 +-
 drivers/gpu/drm/nouveau/nouveau_dmem.c      |  2 +-
 drivers/gpu/drm/nouveau/nouveau_fbcon.c     |  2 +-
 drivers/gpu/drm/nouveau/nouveau_gem.c       | 10 +++----
 drivers/gpu/drm/qxl/qxl_drv.h               |  6 ++---
 drivers/gpu/drm/qxl/qxl_kms.c               |  5 ++--
 drivers/gpu/drm/qxl/qxl_object.h            |  5 ----
 drivers/gpu/drm/qxl/qxl_ttm.c               |  9 -------
 drivers/gpu/drm/radeon/radeon.h             |  1 +
 drivers/gpu/drm/radeon/radeon_object.h      | 16 +++++++++++-
 drivers/gpu/drm/radeon/radeon_ttm.c         |  4 +--
 drivers/gpu/drm/ttm/ttm_bo.c                |  7 -----
 drivers/gpu/drm/vmwgfx/vmwgfx_bo.c          |  4 +--
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c     |  2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c        |  2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c  |  2 --
 include/drm/ttm/ttm_bo_api.h                |  2 --
 include/drm/ttm/ttm_bo_driver.h             |  1 -
 35 files changed, 99 insertions(+), 76 deletions(-)

--
2.25.0

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[PATCH 1/8] drm/amdgpu: move ttm bo->offset to amdgpu_bo

[Nirmoy Das]

GPU address should belong to driver not in memory management.
This patch moves ttm bo.offset and gpu_offset calculation to amdgpu driver.

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 22 ++++++++++++++--
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 29 ++++++++++++++++------
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    |  1 +
 4 files changed, 44 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index e3f16b49e970..04e78f783638 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -917,7 +917,7 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
 		bo->pin_count++;
 
 		if (max_offset != 0) {
-			u64 domain_start = bo->tbo.bdev->man[mem_type].gpu_offset;
+			u64 domain_start = amdgpu_ttm_domain_start(adev, mem_type);
 			WARN_ON_ONCE(max_offset <
 				     (amdgpu_bo_gpu_offset(bo) - domain_start));
 		}
@@ -1445,7 +1445,25 @@ u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo)
 	WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_VRAM &&
 		     !(bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS));
 
-	return amdgpu_gmc_sign_extend(bo->tbo.offset);
+	return amdgpu_bo_gpu_offset_no_check(bo);
+}
+
+/**
+ * amdgpu_bo_gpu_offset_no_check - return GPU offset of bo
+ * @bo:	amdgpu object for which we query the offset
+ *
+ * Returns:
+ * current GPU offset of the object without raising warnings.
+ */
+u64 amdgpu_bo_gpu_offset_no_check(struct amdgpu_bo *bo)
+{
+	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
+	uint64_t offset;
+
+        offset = (bo->tbo.mem.start << PAGE_SHIFT) +
+		 amdgpu_ttm_domain_start(adev, bo->tbo.mem.mem_type);
+
+	return amdgpu_gmc_sign_extend(offset);
 }
 
 /**
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index 36dec51d1ef1..1d86b4c7a1f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -279,6 +279,7 @@ void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
 		     bool shared);
 int amdgpu_bo_sync_wait(struct amdgpu_bo *bo, void *owner, bool intr);
 u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo);
+u64 amdgpu_bo_gpu_offset_no_check(struct amdgpu_bo *bo);
 int amdgpu_bo_validate(struct amdgpu_bo *bo);
 int amdgpu_bo_restore_shadow(struct amdgpu_bo *shadow,
 			     struct dma_fence **fence);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 3ab46d4647e4..e329a108e760 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -97,7 +97,6 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 	case TTM_PL_TT:
 		/* GTT memory  */
 		man->func = &amdgpu_gtt_mgr_func;
-		man->gpu_offset = adev->gmc.gart_start;
 		man->available_caching = TTM_PL_MASK_CACHING;
 		man->default_caching = TTM_PL_FLAG_CACHED;
 		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
@@ -105,7 +104,6 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 	case TTM_PL_VRAM:
 		/* "On-card" video ram */
 		man->func = &amdgpu_vram_mgr_func;
-		man->gpu_offset = adev->gmc.vram_start;
 		man->flags = TTM_MEMTYPE_FLAG_FIXED |
 			     TTM_MEMTYPE_FLAG_MAPPABLE;
 		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
@@ -116,7 +114,6 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 	case AMDGPU_PL_OA:
 		/* On-chip GDS memory*/
 		man->func = &ttm_bo_manager_func;
-		man->gpu_offset = 0;
 		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
 		man->available_caching = TTM_PL_FLAG_UNCACHED;
 		man->default_caching = TTM_PL_FLAG_UNCACHED;
@@ -264,7 +261,7 @@ static uint64_t amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
 
 	if (mm_node->start != AMDGPU_BO_INVALID_OFFSET) {
 		addr = mm_node->start << PAGE_SHIFT;
-		addr += bo->bdev->man[mem->mem_type].gpu_offset;
+		addr += amdgpu_ttm_domain_start(amdgpu_ttm_adev(bo->bdev), mem->mem_type);
 	}
 	return addr;
 }
@@ -751,6 +748,27 @@ static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
 		(offset >> PAGE_SHIFT);
 }
 
+/**
+ * amdgpu_ttm_domain_start - Returns GPU start address
+ * @adev: amdgpu device object
+ * @type: type of the memory
+ *
+ * Returns:
+ * GPU start address of a memory domain
+ */
+
+uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev, uint32_t type)
+{
+	switch(type) {
+	case TTM_PL_TT:
+		return adev->gmc.gart_start;
+	case TTM_PL_VRAM:
+		return adev->gmc.vram_start;
+	}
+
+	return 0;
+}
+
 /*
  * TTM backend functions.
  */
@@ -1162,9 +1180,6 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
 		bo->mem = tmp;
 	}
 
-	bo->offset = (bo->mem.start << PAGE_SHIFT) +
-		bo->bdev->man[bo->mem.mem_type].gpu_offset;
-
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index 0dddedc06ae3..2c90a95c4b27 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -102,6 +102,7 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
 int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
 int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
 int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
+uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev, uint32_t type);
 
 #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
 int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages);
-- 
2.25.0

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[PATCH 2/8] drm/radeon: don't use ttm bo->offset

[Nirmoy Das]

Calculate GPU offset in radeon_bo_gpu_offset without depending on
bo->offset

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-and-tested-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/radeon/radeon.h        |  1 +
 drivers/gpu/drm/radeon/radeon_object.h | 16 +++++++++++++++-
 drivers/gpu/drm/radeon/radeon_ttm.c    |  4 +---
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 30e32adc1fc6..b7c3fb2bfb54 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -2828,6 +2828,7 @@ extern void radeon_ttm_set_active_vram_size(struct radeon_device *rdev, u64 size
 extern void radeon_program_register_sequence(struct radeon_device *rdev,
 					     const u32 *registers,
 					     const u32 array_size);
+struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev);
 
 /*
  * vm
diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
index d23f2ed4126e..4d37571c7ff5 100644
--- a/drivers/gpu/drm/radeon/radeon_object.h
+++ b/drivers/gpu/drm/radeon/radeon_object.h
@@ -90,7 +90,21 @@ static inline void radeon_bo_unreserve(struct radeon_bo *bo)
  */
 static inline u64 radeon_bo_gpu_offset(struct radeon_bo *bo)
 {
-	return bo->tbo.offset;
+	struct radeon_device *rdev;
+	u64 start = 0;
+
+	rdev = radeon_get_rdev(bo->tbo.bdev);
+
+	switch(bo->tbo.mem.mem_type) {
+	case TTM_PL_TT:
+		start = rdev->mc.gtt_start;
+		break;
+	case TTM_PL_VRAM:
+		start = rdev->mc.vram_start;
+		break;
+	}
+
+	return (bo->tbo.mem.start << PAGE_SHIFT) + start;
 }
 
 static inline unsigned long radeon_bo_size(struct radeon_bo *bo)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index badf1b6d1549..1c8303468e8f 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -56,7 +56,7 @@
 static int radeon_ttm_debugfs_init(struct radeon_device *rdev);
 static void radeon_ttm_debugfs_fini(struct radeon_device *rdev);
 
-static struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
+struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
 {
 	struct radeon_mman *mman;
 	struct radeon_device *rdev;
@@ -82,7 +82,6 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 		break;
 	case TTM_PL_TT:
 		man->func = &ttm_bo_manager_func;
-		man->gpu_offset = rdev->mc.gtt_start;
 		man->available_caching = TTM_PL_MASK_CACHING;
 		man->default_caching = TTM_PL_FLAG_CACHED;
 		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
@@ -104,7 +103,6 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 	case TTM_PL_VRAM:
 		/* "On-card" video ram */
 		man->func = &ttm_bo_manager_func;
-		man->gpu_offset = rdev->mc.vram_start;
 		man->flags = TTM_MEMTYPE_FLAG_FIXED |
 			     TTM_MEMTYPE_FLAG_MAPPABLE;
 		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
-- 
2.25.0

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[PATCH 3/8] drm/vmwgfx: don't use ttm bo->offset

[Nirmoy Das]

Calculate GPU offset within vmwgfx driver itself without depending on
bo->offset

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_bo.c         | 4 ++--
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c    | 2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c       | 2 +-
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c | 2 --
 4 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index 8b71bf6b58ef..1e59c019affa 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -258,7 +258,7 @@ int vmw_bo_pin_in_start_of_vram(struct vmw_private *dev_priv,
 		ret = ttm_bo_validate(bo, &placement, &ctx);
 
 	/* For some reason we didn't end up at the start of vram */
-	WARN_ON(ret == 0 && bo->offset != 0);
+	WARN_ON(ret == 0 && bo->mem.start != 0);
 	if (!ret)
 		vmw_bo_pin_reserved(buf, true);
 
@@ -317,7 +317,7 @@ void vmw_bo_get_guest_ptr(const struct ttm_buffer_object *bo,
 {
 	if (bo->mem.mem_type == TTM_PL_VRAM) {
 		ptr->gmrId = SVGA_GMR_FRAMEBUFFER;
-		ptr->offset = bo->offset;
+		ptr->offset = bo->mem.start << PAGE_SHIFT;
 	} else {
 		ptr->gmrId = bo->mem.start;
 		ptr->offset = 0;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 73489a45decb..72c2cf4053df 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3313,7 +3313,7 @@ static void vmw_apply_relocations(struct vmw_sw_context *sw_context)
 		bo = &reloc->vbo->base;
 		switch (bo->mem.mem_type) {
 		case TTM_PL_VRAM:
-			reloc->location->offset += bo->offset;
+			reloc->location->offset += bo->mem.start << PAGE_SHIFT;
 			reloc->location->gmrId = SVGA_GMR_FRAMEBUFFER;
 			break;
 		case VMW_PL_GMR:
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
index e5252ef3812f..1cdc445b24c3 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
@@ -612,7 +612,7 @@ static int vmw_fifo_emit_dummy_legacy_query(struct vmw_private *dev_priv,
 
 	if (bo->mem.mem_type == TTM_PL_VRAM) {
 		cmd->body.guestResult.gmrId = SVGA_GMR_FRAMEBUFFER;
-		cmd->body.guestResult.offset = bo->offset;
+		cmd->body.guestResult.offset = bo->mem.start << PAGE_SHIFT;
 	} else {
 		cmd->body.guestResult.gmrId = bo->mem.start;
 		cmd->body.guestResult.offset = 0;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
index 3f3b2c7a208a..e7134aebeb81 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
@@ -750,7 +750,6 @@ static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 	case TTM_PL_VRAM:
 		/* "On-card" video ram */
 		man->func = &ttm_bo_manager_func;
-		man->gpu_offset = 0;
 		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 		man->available_caching = TTM_PL_FLAG_CACHED;
 		man->default_caching = TTM_PL_FLAG_CACHED;
@@ -763,7 +762,6 @@ static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 		 *  slots as well as the bo size.
 		 */
 		man->func = &vmw_gmrid_manager_func;
-		man->gpu_offset = 0;
 		man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
 		man->available_caching = TTM_PL_FLAG_CACHED;
 		man->default_caching = TTM_PL_FLAG_CACHED;
-- 
2.25.0

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[PATCH 4/8] drm/nouveau: don't use ttm bo->offset v3

[Nirmoy Das]

Store ttm bo->offset in struct nouveau_bo instead.

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/nouveau/dispnv04/crtc.c     |  6 +++---
 drivers/gpu/drm/nouveau/dispnv04/disp.c     |  2 +-
 drivers/gpu/drm/nouveau/dispnv04/overlay.c  |  6 +++---
 drivers/gpu/drm/nouveau/dispnv50/base507c.c |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/core507d.c |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/ovly507e.c |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/wndw.c     |  2 +-
 drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c |  2 +-
 drivers/gpu/drm/nouveau/nouveau_abi16.c     |  8 ++++----
 drivers/gpu/drm/nouveau/nouveau_bo.c        |  8 ++++++++
 drivers/gpu/drm/nouveau/nouveau_bo.h        |  3 +++
 drivers/gpu/drm/nouveau/nouveau_chan.c      |  2 +-
 drivers/gpu/drm/nouveau/nouveau_dmem.c      |  2 +-
 drivers/gpu/drm/nouveau/nouveau_fbcon.c     |  2 +-
 drivers/gpu/drm/nouveau/nouveau_gem.c       | 10 +++++-----
 15 files changed, 35 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv04/crtc.c b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
index 1f08de4241e0..d06a93f2b38a 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/crtc.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
@@ -845,7 +845,7 @@ nv04_crtc_do_mode_set_base(struct drm_crtc *crtc,
 		fb = nouveau_framebuffer(crtc->primary->fb);
 	}

-	nv_crtc->fb.offset = fb->nvbo->bo.offset;
+	nv_crtc->fb.offset = fb->nvbo->offset;

 	if (nv_crtc->lut.depth != drm_fb->format->depth) {
 		nv_crtc->lut.depth = drm_fb->format->depth;
@@ -1013,7 +1013,7 @@ nv04_crtc_cursor_set(struct drm_crtc *crtc, struct drm_file *file_priv,
 		nv04_cursor_upload(dev, cursor, nv_crtc->cursor.nvbo);

 	nouveau_bo_unmap(cursor);
-	nv_crtc->cursor.offset = nv_crtc->cursor.nvbo->bo.offset;
+	nv_crtc->cursor.offset = nv_crtc->cursor.nvbo->offset;
 	nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.offset);
 	nv_crtc->cursor.show(nv_crtc, true);
 out:
@@ -1191,7 +1191,7 @@ nv04_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
 	/* Initialize a page flip struct */
 	*s = (struct nv04_page_flip_state)
 		{ { }, event, crtc, fb->format->cpp[0] * 8, fb->pitches[0],
-		  new_bo->bo.offset };
+		  new_bo->offset };

 	/* Keep vblanks on during flip, for the target crtc of this flip */
 	drm_crtc_vblank_get(crtc);
diff --git a/drivers/gpu/drm/nouveau/dispnv04/disp.c b/drivers/gpu/drm/nouveau/dispnv04/disp.c
index 44ee82d0c9b6..89a4ddfcc55f 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/disp.c
@@ -151,7 +151,7 @@ nv04_display_init(struct drm_device *dev, bool resume, bool runtime)
 			continue;

 		if (nv_crtc->cursor.set_offset)
-			nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.nvbo->bo.offset);
+			nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.nvbo->offset);
 		nv_crtc->cursor.set_pos(nv_crtc, nv_crtc->cursor_saved_x,
 						 nv_crtc->cursor_saved_y);
 	}
diff --git a/drivers/gpu/drm/nouveau/dispnv04/overlay.c b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
index a3a0a73ae8ab..9529bd9053e7 100644
--- a/drivers/gpu/drm/nouveau/dispnv04/overlay.c
+++ b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
@@ -150,7 +150,7 @@ nv10_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 	nvif_mask(dev, NV_PCRTC_ENGINE_CTRL + soff2, NV_CRTC_FSEL_OVERLAY, 0);

 	nvif_wr32(dev, NV_PVIDEO_BASE(flip), 0);
-	nvif_wr32(dev, NV_PVIDEO_OFFSET_BUFF(flip), nv_fb->nvbo->bo.offset);
+	nvif_wr32(dev, NV_PVIDEO_OFFSET_BUFF(flip), nv_fb->nvbo->offset);
 	nvif_wr32(dev, NV_PVIDEO_SIZE_IN(flip), src_h << 16 | src_w);
 	nvif_wr32(dev, NV_PVIDEO_POINT_IN(flip), src_y << 16 | src_x);
 	nvif_wr32(dev, NV_PVIDEO_DS_DX(flip), (src_w << 20) / crtc_w);
@@ -172,7 +172,7 @@ nv10_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
 	if (format & NV_PVIDEO_FORMAT_PLANAR) {
 		nvif_wr32(dev, NV_PVIDEO_UVPLANE_BASE(flip), 0);
 		nvif_wr32(dev, NV_PVIDEO_UVPLANE_OFFSET_BUFF(flip),
-			nv_fb->nvbo->bo.offset + fb->offsets[1]);
+			nv_fb->nvbo->offset + fb->offsets[1]);
 	}
 	nvif_wr32(dev, NV_PVIDEO_FORMAT(flip), format | fb->pitches[0]);
 	nvif_wr32(dev, NV_PVIDEO_STOP, 0);
@@ -396,7 +396,7 @@ nv04_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,

 	for (i = 0; i < 2; i++) {
 		nvif_wr32(dev, NV_PVIDEO_BUFF0_START_ADDRESS + 4 * i,
-			  nv_fb->nvbo->bo.offset);
+			  nv_fb->nvbo->offset);
 		nvif_wr32(dev, NV_PVIDEO_BUFF0_PITCH_LENGTH + 4 * i,
 			  fb->pitches[0]);
 		nvif_wr32(dev, NV_PVIDEO_BUFF0_OFFSET + 4 * i, 0);
diff --git a/drivers/gpu/drm/nouveau/dispnv50/base507c.c b/drivers/gpu/drm/nouveau/dispnv50/base507c.c
index 00a85f1e1a4a..67829f04b2c7 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/base507c.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/base507c.c
@@ -274,7 +274,7 @@ base507c_new_(const struct nv50_wndw_func *func, const u32 *format,

 	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
 			       &oclass, head, &args, sizeof(args),
-			       disp->sync->bo.offset, &wndw->wndw);
+			       disp->sync->offset, &wndw->wndw);
 	if (ret) {
 		NV_ERROR(drm, "base%04x allocation failed: %d\n", oclass, ret);
 		return ret;
diff --git a/drivers/gpu/drm/nouveau/dispnv50/core507d.c b/drivers/gpu/drm/nouveau/dispnv50/core507d.c
index e7fcfa6e6467..793dcb2ea196 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/core507d.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/core507d.c
@@ -99,7 +99,7 @@ core507d_new_(const struct nv50_core_func *func, struct nouveau_drm *drm,

 	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
 			       &oclass, 0, &args, sizeof(args),
-			       disp->sync->bo.offset, &core->chan);
+			       disp->sync->offset, &core->chan);
 	if (ret) {
 		NV_ERROR(drm, "core%04x allocation failed: %d\n", oclass, ret);
 		return ret;
diff --git a/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c b/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c
index 8ccd96113bad..4cce1078140a 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c
@@ -186,7 +186,7 @@ ovly507e_new_(const struct nv50_wndw_func *func, const u32 *format,

 	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
 			       &oclass, 0, &args, sizeof(args),
-			       disp->sync->bo.offset, &wndw->wndw);
+			       disp->sync->offset, &wndw->wndw);
 	if (ret) {
 		NV_ERROR(drm, "ovly%04x allocation failed: %d\n", oclass, ret);
 		return ret;
diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index 890315291b01..e90ffa4a5230 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -509,7 +509,7 @@ nv50_wndw_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
 	}

 	asyw->state.fence = dma_resv_get_excl_rcu(fb->nvbo->bo.base.resv);
-	asyw->image.offset[0] = fb->nvbo->bo.offset;
+	asyw->image.offset[0] = fb->nvbo->offset;

 	if (wndw->func->prepare) {
 		asyh = nv50_head_atom_get(asyw->state.state, asyw->state.crtc);
diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c b/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c
index b92dc3461bbd..bb84e4d54a33 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c
@@ -298,7 +298,7 @@ wndwc37e_new_(const struct nv50_wndw_func *func, struct nouveau_drm *drm,

 	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
 			       &oclass, 0, &args, sizeof(args),
-			       disp->sync->bo.offset, &wndw->wndw);
+			       disp->sync->offset, &wndw->wndw);
 	if (ret) {
 		NV_ERROR(drm, "qndw%04x allocation failed: %d\n", oclass, ret);
 		return ret;
diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c
index e2bae1424502..c32a8ca67f82 100644
--- a/drivers/gpu/drm/nouveau/nouveau_abi16.c
+++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c
@@ -558,13 +558,13 @@ nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
 	if (drm->agp.bridge) {
 		args.target = NV_DMA_V0_TARGET_AGP;
 		args.access = NV_DMA_V0_ACCESS_RDWR;
-		args.start += drm->agp.base + chan->ntfy->bo.offset;
-		args.limit += drm->agp.base + chan->ntfy->bo.offset;
+		args.start += drm->agp.base + chan->ntfy->offset;
+		args.limit += drm->agp.base + chan->ntfy->offset;
 	} else {
 		args.target = NV_DMA_V0_TARGET_VM;
 		args.access = NV_DMA_V0_ACCESS_RDWR;
-		args.start += chan->ntfy->bo.offset;
-		args.limit += chan->ntfy->bo.offset;
+		args.start += chan->ntfy->offset;
+		args.limit += chan->ntfy->offset;
 	}

 	client->route = NVDRM_OBJECT_ABI16;
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 2b4b21b02e40..b7a9b9e85355 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1317,6 +1317,14 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object *bo, bool evict,
 			nouveau_vma_unmap(vma);
 		}
 	}
+
+	if(new_reg) {
+		if (new_reg->mm_node)
+			nvbo->offset = (new_reg->start << PAGE_SHIFT);
+		else
+			nvbo->offset = 0;
+	}
+
 }

 static int
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
index 38f9d8350963..e944b4aa5547 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
@@ -24,6 +24,9 @@ struct nouveau_bo {
 	int pbbo_index;
 	bool validate_mapped;

+	/* GPU address space is independent of CPU word size */
+	uint64_t offset;
+
 	struct list_head vma_list;

 	unsigned contig:1;
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
index d9381a053169..3d71dfcb2fde 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.c
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
@@ -162,7 +162,7 @@ nouveau_channel_prep(struct nouveau_drm *drm, struct nvif_device *device,
 	 * pushbuf lives in, this is because the GEM code requires that
 	 * we be able to call out to other (indirect) push buffers
 	 */
-	chan->push.addr = chan->push.buffer->bo.offset;
+	chan->push.addr = chan->push.buffer->offset;

 	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
 		ret = nouveau_vma_new(chan->push.buffer, chan->vmm,
diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
index 0ad5d87b5a8e..475ed53b99f1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
@@ -89,7 +89,7 @@ static unsigned long nouveau_dmem_page_addr(struct page *page)
 	struct nouveau_dmem_chunk *chunk = page->zone_device_data;
 	unsigned long idx = page_to_pfn(page) - chunk->pfn_first;

-	return (idx << PAGE_SHIFT) + chunk->bo->bo.offset;
+	return (idx << PAGE_SHIFT) + chunk->bo->offset;
 }

 static void nouveau_dmem_page_free(struct page *page)
diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
index 0c5cdda3c336..508b118c0953 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
@@ -393,7 +393,7 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,

 	/* To allow resizeing without swapping buffers */
 	NV_INFO(drm, "allocated %dx%d fb: 0x%llx, bo %p\n",
-		fb->base.width, fb->base.height, fb->nvbo->bo.offset, nvbo);
+		fb->base.width, fb->base.height, fb->nvbo->offset, nvbo);

 	vga_switcheroo_client_fb_set(dev->pdev, info);
 	return 0;
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index f5ece1f94973..cadff37eade8 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -232,7 +232,7 @@ nouveau_gem_info(struct drm_file *file_priv, struct drm_gem_object *gem,
 		rep->domain = NOUVEAU_GEM_DOMAIN_GART;
 	else
 		rep->domain = NOUVEAU_GEM_DOMAIN_VRAM;
-	rep->offset = nvbo->bo.offset;
+	rep->offset = nvbo->offset;
 	if (vmm->vmm.object.oclass >= NVIF_CLASS_VMM_NV50) {
 		vma = nouveau_vma_find(nvbo, vmm);
 		if (!vma)
@@ -516,7 +516,7 @@ validate_list(struct nouveau_channel *chan, struct nouveau_cli *cli,
 		}

 		if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
-			if (nvbo->bo.offset == b->presumed.offset &&
+			if (nvbo->offset == b->presumed.offset &&
 			    ((nvbo->bo.mem.mem_type == TTM_PL_VRAM &&
 			      b->presumed.domain & NOUVEAU_GEM_DOMAIN_VRAM) ||
 			     (nvbo->bo.mem.mem_type == TTM_PL_TT &&
@@ -527,7 +527,7 @@ validate_list(struct nouveau_channel *chan, struct nouveau_cli *cli,
 				b->presumed.domain = NOUVEAU_GEM_DOMAIN_GART;
 			else
 				b->presumed.domain = NOUVEAU_GEM_DOMAIN_VRAM;
-			b->presumed.offset = nvbo->bo.offset;
+			b->presumed.offset = nvbo->offset;
 			b->presumed.valid = 0;
 			relocs++;
 		}
@@ -805,7 +805,7 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
 			struct nouveau_bo *nvbo = (void *)(unsigned long)
 				bo[push[i].bo_index].user_priv;

-			OUT_RING(chan, (nvbo->bo.offset + push[i].offset) | 2);
+			OUT_RING(chan, (nvbo->offset + push[i].offset) | 2);
 			OUT_RING(chan, 0);
 		}
 	} else {
@@ -840,7 +840,7 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
 			}

 			OUT_RING(chan, 0x20000000 |
-				      (nvbo->bo.offset + push[i].offset));
+				      (nvbo->offset + push[i].offset));
 			OUT_RING(chan, 0);
 			for (j = 0; j < NOUVEAU_DMA_SKIPS; j++)
 				OUT_RING(chan, 0);
--
2.25.0

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[PATCH 5/8] drm/qxl: don't use ttm bo->offset

[Nirmoy Das]

This patch removes slot->gpu_offset which is not required as
VRAM and PRIV slot are in separate PCI bar

This patch also removes unused qxl_bo_gpu_offset()

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
---
 drivers/gpu/drm/qxl/qxl_drv.h    | 6 ++----
 drivers/gpu/drm/qxl/qxl_kms.c    | 5 ++---
 drivers/gpu/drm/qxl/qxl_object.h | 5 -----
 drivers/gpu/drm/qxl/qxl_ttm.c    | 9 ---------
 4 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 27e45a2d6b52..df581f0e6699 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -134,7 +134,6 @@ struct qxl_memslot {
 	uint64_t	start_phys_addr;
 	uint64_t	size;
 	uint64_t	high_bits;
-	uint64_t        gpu_offset;
 };
 
 enum {
@@ -311,10 +310,9 @@ qxl_bo_physical_address(struct qxl_device *qdev, struct qxl_bo *bo,
 		(bo->tbo.mem.mem_type == TTM_PL_VRAM)
 		? &qdev->main_slot : &qdev->surfaces_slot;
 
-	WARN_ON_ONCE((bo->tbo.offset & slot->gpu_offset) != slot->gpu_offset);
+       /* TODO - need to hold one of the locks to read bo->tbo.mem.start */
 
-	/* TODO - need to hold one of the locks to read tbo.offset */
-	return slot->high_bits | (bo->tbo.offset - slot->gpu_offset + offset);
+	return slot->high_bits | ((bo->tbo.mem.start << PAGE_SHIFT) + offset);
 }
 
 /* qxl_display.c */
diff --git a/drivers/gpu/drm/qxl/qxl_kms.c b/drivers/gpu/drm/qxl/qxl_kms.c
index 70b20ee4741a..7a5bf544f34d 100644
--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -86,11 +86,10 @@ static void setup_slot(struct qxl_device *qdev,
 	high_bits <<= (64 - (qdev->rom->slot_gen_bits + qdev->rom->slot_id_bits));
 	slot->high_bits = high_bits;
 
-	DRM_INFO("slot %d (%s): base 0x%08lx, size 0x%08lx, gpu_offset 0x%lx\n",
+	DRM_INFO("slot %d (%s): base 0x%08lx, size 0x%08lx\n",
 		 slot->index, slot->name,
 		 (unsigned long)slot->start_phys_addr,
-		 (unsigned long)slot->size,
-		 (unsigned long)slot->gpu_offset);
+		 (unsigned long)slot->size);
 }
 
 void qxl_reinit_memslots(struct qxl_device *qdev)
diff --git a/drivers/gpu/drm/qxl/qxl_object.h b/drivers/gpu/drm/qxl/qxl_object.h
index 8ae54ba7857c..21fa81048f4f 100644
--- a/drivers/gpu/drm/qxl/qxl_object.h
+++ b/drivers/gpu/drm/qxl/qxl_object.h
@@ -48,11 +48,6 @@ static inline void qxl_bo_unreserve(struct qxl_bo *bo)
 	ttm_bo_unreserve(&bo->tbo);
 }
 
-static inline u64 qxl_bo_gpu_offset(struct qxl_bo *bo)
-{
-	return bo->tbo.offset;
-}
-
 static inline unsigned long qxl_bo_size(struct qxl_bo *bo)
 {
 	return bo->tbo.num_pages << PAGE_SHIFT;
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 62a5e424971b..635d000e7934 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -51,11 +51,6 @@ static struct qxl_device *qxl_get_qdev(struct ttm_bo_device *bdev)
 static int qxl_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 			     struct ttm_mem_type_manager *man)
 {
-	struct qxl_device *qdev = qxl_get_qdev(bdev);
-	unsigned int gpu_offset_shift =
-		64 - (qdev->rom->slot_gen_bits + qdev->rom->slot_id_bits + 8);
-	struct qxl_memslot *slot;
-
 	switch (type) {
 	case TTM_PL_SYSTEM:
 		/* System memory */
@@ -66,11 +61,7 @@ static int qxl_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 	case TTM_PL_VRAM:
 	case TTM_PL_PRIV:
 		/* "On-card" video ram */
-		slot = (type == TTM_PL_VRAM) ?
-			&qdev->main_slot : &qdev->surfaces_slot;
-		slot->gpu_offset = (uint64_t)type << gpu_offset_shift;
 		man->func = &ttm_bo_manager_func;
-		man->gpu_offset = slot->gpu_offset;
 		man->flags = TTM_MEMTYPE_FLAG_FIXED |
 			     TTM_MEMTYPE_FLAG_MAPPABLE;
 		man->available_caching = TTM_PL_MASK_CACHING;
-- 
2.25.0

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[PATCH 6/8] drm/vram-helper: don't use ttm bo->offset v2

[Nirmoy Das]

Calculate GEM VRAM bo's offset within vram-helper without depending on
bo->offset

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/drm_gem_vram_helper.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
index 92a11bb42365..3edf5f241c15 100644
--- a/drivers/gpu/drm/drm_gem_vram_helper.c
+++ b/drivers/gpu/drm/drm_gem_vram_helper.c
@@ -198,6 +198,21 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo)
 }
 EXPORT_SYMBOL(drm_gem_vram_mmap_offset);

+/**
+ * drm_gem_vram_pg_offset() - Returns a GEM VRAM object's page offset
+ * @gbo:	the GEM VRAM object
+ *
+ * Returns:
+ * The buffer object's page offset, or
+ * 0 with a warning when memory manager node of the buffer object is NULL
+ * */
+static s64 drm_gem_vram_pg_offset(struct drm_gem_vram_object *gbo)
+{
+	if (WARN_ON_ONCE(!gbo->bo.mem.mm_node))
+		return 0;
+	return gbo->bo.mem.start;
+}
+
 /**
  * drm_gem_vram_offset() - \
 	Returns a GEM VRAM object's offset in video memory
@@ -214,7 +229,7 @@ s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
 {
 	if (WARN_ON_ONCE(!gbo->pin_count))
 		return (s64)-ENODEV;
-	return gbo->bo.offset;
+	return drm_gem_vram_pg_offset(gbo) << PAGE_SHIFT;
 }
 EXPORT_SYMBOL(drm_gem_vram_offset);

--
2.25.0

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[PATCH 7/8] drm/bochs: use drm_gem_vram_offset to get bo offset v2

[Nirmoy Das]

Switch over to GEM VRAM's implementation to retrieve bo->offset

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/bochs/bochs_kms.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 8066d7d370d5..18d2ec34534d 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -29,16 +29,21 @@ static void bochs_plane_update(struct bochs_device *bochs,
 			       struct drm_plane_state *state)
 {
 	struct drm_gem_vram_object *gbo;
+	s64 gpu_addr;

 	if (!state->fb || !bochs->stride)
 		return;

 	gbo = drm_gem_vram_of_gem(state->fb->obj[0]);
+	gpu_addr = drm_gem_vram_offset(gbo);
+	if (WARN_ON_ONCE(gpu_addr < 0))
+		return; /* Bug: we didn't pin the BO to VRAM in prepare_fb. */
+
 	bochs_hw_setbase(bochs,
 			 state->crtc_x,
 			 state->crtc_y,
 			 state->fb->pitches[0],
-			 state->fb->offsets[0] + gbo->bo.offset);
+			 state->fb->offsets[0] + gpu_addr);
 	bochs_hw_setformat(bochs, state->fb->format);
 }

--
2.25.0

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[PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Nirmoy Das]

GPU address handling is device specific and should be handle by its device
driver.

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
 include/drm/ttm/ttm_bo_api.h    | 2 --
 include/drm/ttm/ttm_bo_driver.h | 1 -
 3 files changed, 10 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 151edfd8de77..d5885cd609a3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p
 	drm_printf(p, "    has_type: %d\n", man->has_type);
 	drm_printf(p, "    use_type: %d\n", man->use_type);
 	drm_printf(p, "    flags: 0x%08X\n", man->flags);
-	drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
 	drm_printf(p, "    size: %llu\n", man->size);
 	drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
 	drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
@@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 moved:
 	bo->evicted = false;
 
-	if (bo->mem.mm_node)
-		bo->offset = (bo->mem.start << PAGE_SHIFT) +
-		    bdev->man[bo->mem.mem_type].gpu_offset;
-	else
-		bo->offset = 0;
-
 	ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 	return 0;
 
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index b9bc1b00142e..d6f39ee5bf5d 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -213,8 +213,6 @@ struct ttm_buffer_object {
 	 * either of these locks held.
 	 */
 
-	uint64_t offset; /* GPU address space is independent of CPU word size */
-
 	struct sg_table *sg;
 };
 
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index c9e0fd09f4b2..c8ce6c181abe 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
 	bool has_type;
 	bool use_type;
 	uint32_t flags;
-	uint64_t gpu_offset; /* GPU address space is independent of CPU word size */
 	uint64_t size;
 	uint32_t available_caching;
 	uint32_t default_caching;
-- 
2.25.0

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Re: [PATCH 6/8] drm/vram-helper: don't use ttm bo->offset v2

[Daniel Vetter]

On Wed, Feb 19, 2020 at 02:53:20PM +0100, Nirmoy Das wrote:
> Calculate GEM VRAM bo's offset within vram-helper without depending on
> bo->offset
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> ---
>  drivers/gpu/drm/drm_gem_vram_helper.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
> index 92a11bb42365..3edf5f241c15 100644
> --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> @@ -198,6 +198,21 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo)
>  }
>  EXPORT_SYMBOL(drm_gem_vram_mmap_offset);
> 
> +/**
> + * drm_gem_vram_pg_offset() - Returns a GEM VRAM object's page offset
> + * @gbo:	the GEM VRAM object
> + *
> + * Returns:
> + * The buffer object's page offset, or
> + * 0 with a warning when memory manager node of the buffer object is NULL
> + * */

We generally don't add full formal kerneldoc for internal functions like
this. It won't get pulled into generated docs and generally just bitrots.
Just informal comment if it's really tricky, but the function name here is
clear enough I think.

So with the comment removed:

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> +static s64 drm_gem_vram_pg_offset(struct drm_gem_vram_object *gbo)
> +{
> +	if (WARN_ON_ONCE(!gbo->bo.mem.mm_node))
> +		return 0;
> +	return gbo->bo.mem.start;
> +}
> +
>  /**
>   * drm_gem_vram_offset() - \
>  	Returns a GEM VRAM object's offset in video memory
> @@ -214,7 +229,7 @@ s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
>  {
>  	if (WARN_ON_ONCE(!gbo->pin_count))
>  		return (s64)-ENODEV;
> -	return gbo->bo.offset;
> +	return drm_gem_vram_pg_offset(gbo) << PAGE_SHIFT;
>  }
>  EXPORT_SYMBOL(drm_gem_vram_offset);
> 
> --
> 2.25.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH 7/8] drm/bochs: use drm_gem_vram_offset to get bo offset v2

[Daniel Vetter]

On Wed, Feb 19, 2020 at 02:53:21PM +0100, Nirmoy Das wrote:
> Switch over to GEM VRAM's implementation to retrieve bo->offset
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> ---
>  drivers/gpu/drm/bochs/bochs_kms.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
> index 8066d7d370d5..18d2ec34534d 100644
> --- a/drivers/gpu/drm/bochs/bochs_kms.c
> +++ b/drivers/gpu/drm/bochs/bochs_kms.c
> @@ -29,16 +29,21 @@ static void bochs_plane_update(struct bochs_device *bochs,
>  			       struct drm_plane_state *state)
>  {
>  	struct drm_gem_vram_object *gbo;
> +	s64 gpu_addr;
> 
>  	if (!state->fb || !bochs->stride)
>  		return;
> 
>  	gbo = drm_gem_vram_of_gem(state->fb->obj[0]);
> +	gpu_addr = drm_gem_vram_offset(gbo);
> +	if (WARN_ON_ONCE(gpu_addr < 0))
> +		return; /* Bug: we didn't pin the BO to VRAM in prepare_fb. */

That negative errno in gpu_addr from vram helpers is kinda wild.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> +
>  	bochs_hw_setbase(bochs,
>  			 state->crtc_x,
>  			 state->crtc_y,
>  			 state->fb->pitches[0],
> -			 state->fb->offsets[0] + gbo->bo.offset);
> +			 state->fb->offsets[0] + gpu_addr);
>  	bochs_hw_setformat(bochs, state->fb->format);
>  }
> 
> --
> 2.25.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH 6/8] drm/vram-helper: don't use ttm bo->offset v2

[Nirmoy]

On 2/20/20 7:09 PM, Daniel Vetter wrote:
> On Wed, Feb 19, 2020 at 02:53:20PM +0100, Nirmoy Das wrote:
>> Calculate GEM VRAM bo's offset within vram-helper without depending on
>> bo->offset
>>
>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>> ---
>>   drivers/gpu/drm/drm_gem_vram_helper.c | 17 ++++++++++++++++-
>>   1 file changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
>> index 92a11bb42365..3edf5f241c15 100644
>> --- a/drivers/gpu/drm/drm_gem_vram_helper.c
>> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
>> @@ -198,6 +198,21 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo)
>>   }
>>   EXPORT_SYMBOL(drm_gem_vram_mmap_offset);
>>
>> +/**
>> + * drm_gem_vram_pg_offset() - Returns a GEM VRAM object's page offset
>> + * @gbo:	the GEM VRAM object
>> + *
>> + * Returns:
>> + * The buffer object's page offset, or
>> + * 0 with a warning when memory manager node of the buffer object is NULL
>> + * */
> We generally don't add full formal kerneldoc for internal functions like
> this. It won't get pulled into generated docs and generally just bitrots.
> Just informal comment if it's really tricky, but the function name here is
> clear enough I think.

Thanks for you review Daniel, I will remove that comment.


Nirmoy

> So with the comment removed:
>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
>> +static s64 drm_gem_vram_pg_offset(struct drm_gem_vram_object *gbo)
>> +{
>> +	if (WARN_ON_ONCE(!gbo->bo.mem.mm_node))
>> +		return 0;
>> +	return gbo->bo.mem.start;
>> +}
>> +
>>   /**
>>    * drm_gem_vram_offset() - \
>>   	Returns a GEM VRAM object's offset in video memory
>> @@ -214,7 +229,7 @@ s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
>>   {
>>   	if (WARN_ON_ONCE(!gbo->pin_count))
>>   		return (s64)-ENODEV;
>> -	return gbo->bo.offset;
>> +	return drm_gem_vram_pg_offset(gbo) << PAGE_SHIFT;
>>   }
>>   EXPORT_SYMBOL(drm_gem_vram_offset);
>>
>> --
>> 2.25.0
>>
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Re: [PATCH 1/8] drm/amdgpu: move ttm bo->offset to amdgpu_bo

[Luben Tuikov]

On 2020-02-19 08:53, Nirmoy Das wrote:
> GPU address should belong to driver not in memory management.
> This patch moves ttm bo.offset and gpu_offset calculation to amdgpu driver.
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> Acked-by: Huang Rui <ray.huang@amd.com>
> Reviewed-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 22 ++++++++++++++--
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  1 +
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 29 ++++++++++++++++------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h    |  1 +
>  4 files changed, 44 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index e3f16b49e970..04e78f783638 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -917,7 +917,7 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
>  		bo->pin_count++;
>  
>  		if (max_offset != 0) {
> -			u64 domain_start = bo->tbo.bdev->man[mem_type].gpu_offset;
> +			u64 domain_start = amdgpu_ttm_domain_start(adev, mem_type);
>  			WARN_ON_ONCE(max_offset <
>  				     (amdgpu_bo_gpu_offset(bo) - domain_start));
>  		}
> @@ -1445,7 +1445,25 @@ u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo)
>  	WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_VRAM &&
>  		     !(bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS));
>  
> -	return amdgpu_gmc_sign_extend(bo->tbo.offset);
> +	return amdgpu_bo_gpu_offset_no_check(bo);
> +}
> +
> +/**
> + * amdgpu_bo_gpu_offset_no_check - return GPU offset of bo
> + * @bo:	amdgpu object for which we query the offset
> + *
> + * Returns:
> + * current GPU offset of the object without raising warnings.
> + */
> +u64 amdgpu_bo_gpu_offset_no_check(struct amdgpu_bo *bo)
> +{
> +	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
> +	uint64_t offset;
> +
> +        offset = (bo->tbo.mem.start << PAGE_SHIFT) +
> +		 amdgpu_ttm_domain_start(adev, bo->tbo.mem.mem_type);
> +
> +	return amdgpu_gmc_sign_extend(offset);
>  }
>  
>  /**
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> index 36dec51d1ef1..1d86b4c7a1f2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> @@ -279,6 +279,7 @@ void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
>  		     bool shared);
>  int amdgpu_bo_sync_wait(struct amdgpu_bo *bo, void *owner, bool intr);
>  u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo);
> +u64 amdgpu_bo_gpu_offset_no_check(struct amdgpu_bo *bo);
>  int amdgpu_bo_validate(struct amdgpu_bo *bo);
>  int amdgpu_bo_restore_shadow(struct amdgpu_bo *shadow,
>  			     struct dma_fence **fence);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> index 3ab46d4647e4..e329a108e760 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> @@ -97,7 +97,6 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
>  	case TTM_PL_TT:
>  		/* GTT memory  */
>  		man->func = &amdgpu_gtt_mgr_func;
> -		man->gpu_offset = adev->gmc.gart_start;
>  		man->available_caching = TTM_PL_MASK_CACHING;
>  		man->default_caching = TTM_PL_FLAG_CACHED;
>  		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
> @@ -105,7 +104,6 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
>  	case TTM_PL_VRAM:
>  		/* "On-card" video ram */
>  		man->func = &amdgpu_vram_mgr_func;
> -		man->gpu_offset = adev->gmc.vram_start;
>  		man->flags = TTM_MEMTYPE_FLAG_FIXED |
>  			     TTM_MEMTYPE_FLAG_MAPPABLE;
>  		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
> @@ -116,7 +114,6 @@ static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
>  	case AMDGPU_PL_OA:
>  		/* On-chip GDS memory*/
>  		man->func = &ttm_bo_manager_func;
> -		man->gpu_offset = 0;
>  		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
>  		man->available_caching = TTM_PL_FLAG_UNCACHED;
>  		man->default_caching = TTM_PL_FLAG_UNCACHED;
> @@ -264,7 +261,7 @@ static uint64_t amdgpu_mm_node_addr(struct ttm_buffer_object *bo,
>  
>  	if (mm_node->start != AMDGPU_BO_INVALID_OFFSET) {
>  		addr = mm_node->start << PAGE_SHIFT;
> -		addr += bo->bdev->man[mem->mem_type].gpu_offset;
> +		addr += amdgpu_ttm_domain_start(amdgpu_ttm_adev(bo->bdev), mem->mem_type);
>  	}
>  	return addr;
>  }
> @@ -751,6 +748,27 @@ static unsigned long amdgpu_ttm_io_mem_pfn(struct ttm_buffer_object *bo,
>  		(offset >> PAGE_SHIFT);
>  }
>  
> +/**
> + * amdgpu_ttm_domain_start - Returns GPU start address
> + * @adev: amdgpu device object
> + * @type: type of the memory
> + *
> + * Returns:
> + * GPU start address of a memory domain
> + */
> +
> +uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev, uint32_t type)
> +{
> +	switch(type) {

LKCS wants a space after keywords. "switch (" 

> +	case TTM_PL_TT:
> +		return adev->gmc.gart_start;
> +	case TTM_PL_VRAM:
> +		return adev->gmc.vram_start;
> +	}

Could you have parameterized this address
to index it into an array by "type" and return
the address, as opposed to using a switch-case?

Regards,
Luben

> +
> +	return 0;
> +}
> +
>  /*
>   * TTM backend functions.
>   */
> @@ -1162,9 +1180,6 @@ int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
>  		bo->mem = tmp;
>  	}
>  
> -	bo->offset = (bo->mem.start << PAGE_SHIFT) +
> -		bo->bdev->man[bo->mem.mem_type].gpu_offset;
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> index 0dddedc06ae3..2c90a95c4b27 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
> @@ -102,6 +102,7 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
>  int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
>  int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
>  int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
> +uint64_t amdgpu_ttm_domain_start(struct amdgpu_device *adev, uint32_t type);
>  
>  #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
>  int amdgpu_ttm_tt_get_user_pages(struct amdgpu_bo *bo, struct page **pages);
> 

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Re: [PATCH 2/8] drm/radeon: don't use ttm bo->offset

[Luben Tuikov]

On 2020-02-19 08:53, Nirmoy Das wrote:
> Calculate GPU offset in radeon_bo_gpu_offset without depending on
> bo->offset
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> Reviewed-and-tested-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/gpu/drm/radeon/radeon.h        |  1 +
>  drivers/gpu/drm/radeon/radeon_object.h | 16 +++++++++++++++-
>  drivers/gpu/drm/radeon/radeon_ttm.c    |  4 +---
>  3 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index 30e32adc1fc6..b7c3fb2bfb54 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -2828,6 +2828,7 @@ extern void radeon_ttm_set_active_vram_size(struct radeon_device *rdev, u64 size
>  extern void radeon_program_register_sequence(struct radeon_device *rdev,
>  					     const u32 *registers,
>  					     const u32 array_size);
> +struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev);
>  
>  /*
>   * vm
> diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
> index d23f2ed4126e..4d37571c7ff5 100644
> --- a/drivers/gpu/drm/radeon/radeon_object.h
> +++ b/drivers/gpu/drm/radeon/radeon_object.h
> @@ -90,7 +90,21 @@ static inline void radeon_bo_unreserve(struct radeon_bo *bo)
>   */
>  static inline u64 radeon_bo_gpu_offset(struct radeon_bo *bo)
>  {
> -	return bo->tbo.offset;
> +	struct radeon_device *rdev;
> +	u64 start = 0;
> +
> +	rdev = radeon_get_rdev(bo->tbo.bdev);
> +
> +	switch(bo->tbo.mem.mem_type) {

LKCS wants a space after a keyword, "switch (" .

> +	case TTM_PL_TT:
> +		start = rdev->mc.gtt_start;
> +		break;
> +	case TTM_PL_VRAM:
> +		start = rdev->mc.vram_start;
> +		break;
> +	}

Could this lookup have been parameterized by "mem_type"
to be looked up by an index (possibly "mem_type") to result
in something new like (pseudo-code):
     start = rdev->mc.mem_start_table[bo->tbo.mem.mem_type];
Where "mem_start_table" is a new table holding memory starts
of particular memories.
Then you don't need the switch-case.

Regards,
Luben

> +
> +	return (bo->tbo.mem.start << PAGE_SHIFT) + start;
>  }
>  
>  static inline unsigned long radeon_bo_size(struct radeon_bo *bo)
> diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
> index badf1b6d1549..1c8303468e8f 100644
> --- a/drivers/gpu/drm/radeon/radeon_ttm.c
> +++ b/drivers/gpu/drm/radeon/radeon_ttm.c
> @@ -56,7 +56,7 @@
>  static int radeon_ttm_debugfs_init(struct radeon_device *rdev);
>  static void radeon_ttm_debugfs_fini(struct radeon_device *rdev);
>  
> -static struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
> +struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
>  {
>  	struct radeon_mman *mman;
>  	struct radeon_device *rdev;
> @@ -82,7 +82,6 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
>  		break;
>  	case TTM_PL_TT:
>  		man->func = &ttm_bo_manager_func;
> -		man->gpu_offset = rdev->mc.gtt_start;
>  		man->available_caching = TTM_PL_MASK_CACHING;
>  		man->default_caching = TTM_PL_FLAG_CACHED;
>  		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
> @@ -104,7 +103,6 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
>  	case TTM_PL_VRAM:
>  		/* "On-card" video ram */
>  		man->func = &ttm_bo_manager_func;
> -		man->gpu_offset = rdev->mc.vram_start;
>  		man->flags = TTM_MEMTYPE_FLAG_FIXED |
>  			     TTM_MEMTYPE_FLAG_MAPPABLE;
>  		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
> 

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Re: [PATCH 4/8] drm/nouveau: don't use ttm bo->offset v3

[Luben Tuikov]

On 2020-02-19 08:53, Nirmoy Das wrote:
> Store ttm bo->offset in struct nouveau_bo instead.
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> ---
>  drivers/gpu/drm/nouveau/dispnv04/crtc.c     |  6 +++---
>  drivers/gpu/drm/nouveau/dispnv04/disp.c     |  2 +-
>  drivers/gpu/drm/nouveau/dispnv04/overlay.c  |  6 +++---
>  drivers/gpu/drm/nouveau/dispnv50/base507c.c |  2 +-
>  drivers/gpu/drm/nouveau/dispnv50/core507d.c |  2 +-
>  drivers/gpu/drm/nouveau/dispnv50/ovly507e.c |  2 +-
>  drivers/gpu/drm/nouveau/dispnv50/wndw.c     |  2 +-
>  drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c |  2 +-
>  drivers/gpu/drm/nouveau/nouveau_abi16.c     |  8 ++++----
>  drivers/gpu/drm/nouveau/nouveau_bo.c        |  8 ++++++++
>  drivers/gpu/drm/nouveau/nouveau_bo.h        |  3 +++
>  drivers/gpu/drm/nouveau/nouveau_chan.c      |  2 +-
>  drivers/gpu/drm/nouveau/nouveau_dmem.c      |  2 +-
>  drivers/gpu/drm/nouveau/nouveau_fbcon.c     |  2 +-
>  drivers/gpu/drm/nouveau/nouveau_gem.c       | 10 +++++-----
>  15 files changed, 35 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/dispnv04/crtc.c b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
> index 1f08de4241e0..d06a93f2b38a 100644
> --- a/drivers/gpu/drm/nouveau/dispnv04/crtc.c
> +++ b/drivers/gpu/drm/nouveau/dispnv04/crtc.c
> @@ -845,7 +845,7 @@ nv04_crtc_do_mode_set_base(struct drm_crtc *crtc,
>  		fb = nouveau_framebuffer(crtc->primary->fb);
>  	}
> 
> -	nv_crtc->fb.offset = fb->nvbo->bo.offset;
> +	nv_crtc->fb.offset = fb->nvbo->offset;
> 
>  	if (nv_crtc->lut.depth != drm_fb->format->depth) {
>  		nv_crtc->lut.depth = drm_fb->format->depth;
> @@ -1013,7 +1013,7 @@ nv04_crtc_cursor_set(struct drm_crtc *crtc, struct drm_file *file_priv,
>  		nv04_cursor_upload(dev, cursor, nv_crtc->cursor.nvbo);
> 
>  	nouveau_bo_unmap(cursor);
> -	nv_crtc->cursor.offset = nv_crtc->cursor.nvbo->bo.offset;
> +	nv_crtc->cursor.offset = nv_crtc->cursor.nvbo->offset;
>  	nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.offset);
>  	nv_crtc->cursor.show(nv_crtc, true);
>  out:
> @@ -1191,7 +1191,7 @@ nv04_crtc_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb,
>  	/* Initialize a page flip struct */
>  	*s = (struct nv04_page_flip_state)
>  		{ { }, event, crtc, fb->format->cpp[0] * 8, fb->pitches[0],
> -		  new_bo->bo.offset };
> +		  new_bo->offset };
> 
>  	/* Keep vblanks on during flip, for the target crtc of this flip */
>  	drm_crtc_vblank_get(crtc);
> diff --git a/drivers/gpu/drm/nouveau/dispnv04/disp.c b/drivers/gpu/drm/nouveau/dispnv04/disp.c
> index 44ee82d0c9b6..89a4ddfcc55f 100644
> --- a/drivers/gpu/drm/nouveau/dispnv04/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv04/disp.c
> @@ -151,7 +151,7 @@ nv04_display_init(struct drm_device *dev, bool resume, bool runtime)
>  			continue;
> 
>  		if (nv_crtc->cursor.set_offset)
> -			nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.nvbo->bo.offset);
> +			nv_crtc->cursor.set_offset(nv_crtc, nv_crtc->cursor.nvbo->offset);
>  		nv_crtc->cursor.set_pos(nv_crtc, nv_crtc->cursor_saved_x,
>  						 nv_crtc->cursor_saved_y);
>  	}
> diff --git a/drivers/gpu/drm/nouveau/dispnv04/overlay.c b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
> index a3a0a73ae8ab..9529bd9053e7 100644
> --- a/drivers/gpu/drm/nouveau/dispnv04/overlay.c
> +++ b/drivers/gpu/drm/nouveau/dispnv04/overlay.c
> @@ -150,7 +150,7 @@ nv10_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  	nvif_mask(dev, NV_PCRTC_ENGINE_CTRL + soff2, NV_CRTC_FSEL_OVERLAY, 0);
> 
>  	nvif_wr32(dev, NV_PVIDEO_BASE(flip), 0);
> -	nvif_wr32(dev, NV_PVIDEO_OFFSET_BUFF(flip), nv_fb->nvbo->bo.offset);
> +	nvif_wr32(dev, NV_PVIDEO_OFFSET_BUFF(flip), nv_fb->nvbo->offset);
>  	nvif_wr32(dev, NV_PVIDEO_SIZE_IN(flip), src_h << 16 | src_w);
>  	nvif_wr32(dev, NV_PVIDEO_POINT_IN(flip), src_y << 16 | src_x);
>  	nvif_wr32(dev, NV_PVIDEO_DS_DX(flip), (src_w << 20) / crtc_w);
> @@ -172,7 +172,7 @@ nv10_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
>  	if (format & NV_PVIDEO_FORMAT_PLANAR) {
>  		nvif_wr32(dev, NV_PVIDEO_UVPLANE_BASE(flip), 0);
>  		nvif_wr32(dev, NV_PVIDEO_UVPLANE_OFFSET_BUFF(flip),
> -			nv_fb->nvbo->bo.offset + fb->offsets[1]);
> +			nv_fb->nvbo->offset + fb->offsets[1]);
>  	}
>  	nvif_wr32(dev, NV_PVIDEO_FORMAT(flip), format | fb->pitches[0]);
>  	nvif_wr32(dev, NV_PVIDEO_STOP, 0);
> @@ -396,7 +396,7 @@ nv04_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
> 
>  	for (i = 0; i < 2; i++) {
>  		nvif_wr32(dev, NV_PVIDEO_BUFF0_START_ADDRESS + 4 * i,
> -			  nv_fb->nvbo->bo.offset);
> +			  nv_fb->nvbo->offset);
>  		nvif_wr32(dev, NV_PVIDEO_BUFF0_PITCH_LENGTH + 4 * i,
>  			  fb->pitches[0]);
>  		nvif_wr32(dev, NV_PVIDEO_BUFF0_OFFSET + 4 * i, 0);
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/base507c.c b/drivers/gpu/drm/nouveau/dispnv50/base507c.c
> index 00a85f1e1a4a..67829f04b2c7 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/base507c.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/base507c.c
> @@ -274,7 +274,7 @@ base507c_new_(const struct nv50_wndw_func *func, const u32 *format,
> 
>  	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
>  			       &oclass, head, &args, sizeof(args),
> -			       disp->sync->bo.offset, &wndw->wndw);
> +			       disp->sync->offset, &wndw->wndw);
>  	if (ret) {
>  		NV_ERROR(drm, "base%04x allocation failed: %d\n", oclass, ret);
>  		return ret;
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/core507d.c b/drivers/gpu/drm/nouveau/dispnv50/core507d.c
> index e7fcfa6e6467..793dcb2ea196 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/core507d.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/core507d.c
> @@ -99,7 +99,7 @@ core507d_new_(const struct nv50_core_func *func, struct nouveau_drm *drm,
> 
>  	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
>  			       &oclass, 0, &args, sizeof(args),
> -			       disp->sync->bo.offset, &core->chan);
> +			       disp->sync->offset, &core->chan);
>  	if (ret) {
>  		NV_ERROR(drm, "core%04x allocation failed: %d\n", oclass, ret);
>  		return ret;
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c b/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c
> index 8ccd96113bad..4cce1078140a 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/ovly507e.c
> @@ -186,7 +186,7 @@ ovly507e_new_(const struct nv50_wndw_func *func, const u32 *format,
> 
>  	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
>  			       &oclass, 0, &args, sizeof(args),
> -			       disp->sync->bo.offset, &wndw->wndw);
> +			       disp->sync->offset, &wndw->wndw);
>  	if (ret) {
>  		NV_ERROR(drm, "ovly%04x allocation failed: %d\n", oclass, ret);
>  		return ret;
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
> index 890315291b01..e90ffa4a5230 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
> @@ -509,7 +509,7 @@ nv50_wndw_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
>  	}
> 
>  	asyw->state.fence = dma_resv_get_excl_rcu(fb->nvbo->bo.base.resv);
> -	asyw->image.offset[0] = fb->nvbo->bo.offset;
> +	asyw->image.offset[0] = fb->nvbo->offset;
> 
>  	if (wndw->func->prepare) {
>  		asyh = nv50_head_atom_get(asyw->state.state, asyw->state.crtc);
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c b/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c
> index b92dc3461bbd..bb84e4d54a33 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/wndwc37e.c
> @@ -298,7 +298,7 @@ wndwc37e_new_(const struct nv50_wndw_func *func, struct nouveau_drm *drm,
> 
>  	ret = nv50_dmac_create(&drm->client.device, &disp->disp->object,
>  			       &oclass, 0, &args, sizeof(args),
> -			       disp->sync->bo.offset, &wndw->wndw);
> +			       disp->sync->offset, &wndw->wndw);
>  	if (ret) {
>  		NV_ERROR(drm, "qndw%04x allocation failed: %d\n", oclass, ret);
>  		return ret;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c
> index e2bae1424502..c32a8ca67f82 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_abi16.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c
> @@ -558,13 +558,13 @@ nouveau_abi16_ioctl_notifierobj_alloc(ABI16_IOCTL_ARGS)
>  	if (drm->agp.bridge) {
>  		args.target = NV_DMA_V0_TARGET_AGP;
>  		args.access = NV_DMA_V0_ACCESS_RDWR;
> -		args.start += drm->agp.base + chan->ntfy->bo.offset;
> -		args.limit += drm->agp.base + chan->ntfy->bo.offset;
> +		args.start += drm->agp.base + chan->ntfy->offset;
> +		args.limit += drm->agp.base + chan->ntfy->offset;
>  	} else {
>  		args.target = NV_DMA_V0_TARGET_VM;
>  		args.access = NV_DMA_V0_ACCESS_RDWR;
> -		args.start += chan->ntfy->bo.offset;
> -		args.limit += chan->ntfy->bo.offset;
> +		args.start += chan->ntfy->offset;
> +		args.limit += chan->ntfy->offset;
>  	}
> 
>  	client->route = NVDRM_OBJECT_ABI16;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index 2b4b21b02e40..b7a9b9e85355 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -1317,6 +1317,14 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object *bo, bool evict,
>  			nouveau_vma_unmap(vma);
>  		}
>  	}
> +
> +	if(new_reg) {

LKCS wants a space after a C keyword: "if (".

https://www.kernel.org/doc/html/v4.10/process/coding-style.html#spaces

Regards,
Luben

> +		if (new_reg->mm_node)
> +			nvbo->offset = (new_reg->start << PAGE_SHIFT);
> +		else
> +			nvbo->offset = 0;
> +	}
> +
>  }
> 
>  static int
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.h b/drivers/gpu/drm/nouveau/nouveau_bo.h
> index 38f9d8350963..e944b4aa5547 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.h
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.h
> @@ -24,6 +24,9 @@ struct nouveau_bo {
>  	int pbbo_index;
>  	bool validate_mapped;
> 
> +	/* GPU address space is independent of CPU word size */
> +	uint64_t offset;
> +
>  	struct list_head vma_list;
> 
>  	unsigned contig:1;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
> index d9381a053169..3d71dfcb2fde 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_chan.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
> @@ -162,7 +162,7 @@ nouveau_channel_prep(struct nouveau_drm *drm, struct nvif_device *device,
>  	 * pushbuf lives in, this is because the GEM code requires that
>  	 * we be able to call out to other (indirect) push buffers
>  	 */
> -	chan->push.addr = chan->push.buffer->bo.offset;
> +	chan->push.addr = chan->push.buffer->offset;
> 
>  	if (device->info.family >= NV_DEVICE_INFO_V0_TESLA) {
>  		ret = nouveau_vma_new(chan->push.buffer, chan->vmm,
> diff --git a/drivers/gpu/drm/nouveau/nouveau_dmem.c b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> index 0ad5d87b5a8e..475ed53b99f1 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_dmem.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_dmem.c
> @@ -89,7 +89,7 @@ static unsigned long nouveau_dmem_page_addr(struct page *page)
>  	struct nouveau_dmem_chunk *chunk = page->zone_device_data;
>  	unsigned long idx = page_to_pfn(page) - chunk->pfn_first;
> 
> -	return (idx << PAGE_SHIFT) + chunk->bo->bo.offset;
> +	return (idx << PAGE_SHIFT) + chunk->bo->offset;
>  }
> 
>  static void nouveau_dmem_page_free(struct page *page)
> diff --git a/drivers/gpu/drm/nouveau/nouveau_fbcon.c b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
> index 0c5cdda3c336..508b118c0953 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_fbcon.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_fbcon.c
> @@ -393,7 +393,7 @@ nouveau_fbcon_create(struct drm_fb_helper *helper,
> 
>  	/* To allow resizeing without swapping buffers */
>  	NV_INFO(drm, "allocated %dx%d fb: 0x%llx, bo %p\n",
> -		fb->base.width, fb->base.height, fb->nvbo->bo.offset, nvbo);
> +		fb->base.width, fb->base.height, fb->nvbo->offset, nvbo);
> 
>  	vga_switcheroo_client_fb_set(dev->pdev, info);
>  	return 0;
> diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
> index f5ece1f94973..cadff37eade8 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_gem.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
> @@ -232,7 +232,7 @@ nouveau_gem_info(struct drm_file *file_priv, struct drm_gem_object *gem,
>  		rep->domain = NOUVEAU_GEM_DOMAIN_GART;
>  	else
>  		rep->domain = NOUVEAU_GEM_DOMAIN_VRAM;
> -	rep->offset = nvbo->bo.offset;
> +	rep->offset = nvbo->offset;
>  	if (vmm->vmm.object.oclass >= NVIF_CLASS_VMM_NV50) {
>  		vma = nouveau_vma_find(nvbo, vmm);
>  		if (!vma)
> @@ -516,7 +516,7 @@ validate_list(struct nouveau_channel *chan, struct nouveau_cli *cli,
>  		}
> 
>  		if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {
> -			if (nvbo->bo.offset == b->presumed.offset &&
> +			if (nvbo->offset == b->presumed.offset &&
>  			    ((nvbo->bo.mem.mem_type == TTM_PL_VRAM &&
>  			      b->presumed.domain & NOUVEAU_GEM_DOMAIN_VRAM) ||
>  			     (nvbo->bo.mem.mem_type == TTM_PL_TT &&
> @@ -527,7 +527,7 @@ validate_list(struct nouveau_channel *chan, struct nouveau_cli *cli,
>  				b->presumed.domain = NOUVEAU_GEM_DOMAIN_GART;
>  			else
>  				b->presumed.domain = NOUVEAU_GEM_DOMAIN_VRAM;
> -			b->presumed.offset = nvbo->bo.offset;
> +			b->presumed.offset = nvbo->offset;
>  			b->presumed.valid = 0;
>  			relocs++;
>  		}
> @@ -805,7 +805,7 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
>  			struct nouveau_bo *nvbo = (void *)(unsigned long)
>  				bo[push[i].bo_index].user_priv;
> 
> -			OUT_RING(chan, (nvbo->bo.offset + push[i].offset) | 2);
> +			OUT_RING(chan, (nvbo->offset + push[i].offset) | 2);
>  			OUT_RING(chan, 0);
>  		}
>  	} else {
> @@ -840,7 +840,7 @@ nouveau_gem_ioctl_pushbuf(struct drm_device *dev, void *data,
>  			}
> 
>  			OUT_RING(chan, 0x20000000 |
> -				      (nvbo->bo.offset + push[i].offset));
> +				      (nvbo->offset + push[i].offset));
>  			OUT_RING(chan, 0);
>  			for (j = 0; j < NOUVEAU_DMA_SKIPS; j++)
>  				OUT_RING(chan, 0);
> --
> 2.25.0
> 
> _______________________________________________
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> amd-gfx@lists.freedesktop.org
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> 

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Re: [PATCH 3/8] drm/vmwgfx: don't use ttm bo->offset

[Thomas Hellström (VMware)]

On 2/19/20 2:53 PM, Nirmoy Das wrote:
> Calculate GPU offset within vmwgfx driver itself without depending on
> bo->offset
>
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> Acked-by: Christian König <christian.koenig@amd.com>

Tested-by: Thomas Hellstrom <thellstrom@vmware.com>
Acked-by: Thomas Hellstrom <thellstrom@vmware.com>


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Re: [PATCH v3 0/8] do not store GPU address in TTM

[Thomas Hellström (VMware)]

Hi,

On 2/19/20 2:53 PM, Nirmoy Das wrote:
> With this patch series I am trying to remove GPU address dependency in
> TTM and moving GPU address calculation to individual drm drivers.

For future reference, could you please add a motivation for the series?
for example cleanup, needed because, simplifies... etc.

Thanks,

Thomas


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Re: [PATCH 6/8] drm/vram-helper: don't use ttm bo->offset v2

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 2047 bytes --]

Hi

Am 19.02.20 um 14:53 schrieb Nirmoy Das:
> Calculate GEM VRAM bo's offset within vram-helper without depending on
> bo->offset
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> ---
>  drivers/gpu/drm/drm_gem_vram_helper.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c b/drivers/gpu/drm/drm_gem_vram_helper.c
> index 92a11bb42365..3edf5f241c15 100644
> --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> @@ -198,6 +198,21 @@ u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo)
>  }
>  EXPORT_SYMBOL(drm_gem_vram_mmap_offset);
> 
> +/**
> + * drm_gem_vram_pg_offset() - Returns a GEM VRAM object's page offset
> + * @gbo:	the GEM VRAM object
> + *
> + * Returns:
> + * The buffer object's page offset, or
> + * 0 with a warning when memory manager node of the buffer object is NULL
> + * */
> +static s64 drm_gem_vram_pg_offset(struct drm_gem_vram_object *gbo)
> +{
> +	if (WARN_ON_ONCE(!gbo->bo.mem.mm_node))
> +		return 0;
> +	return gbo->bo.mem.start;
> +}

As Daniel said, you don't heve to document this function. Otherwise

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>

> +
>  /**
>   * drm_gem_vram_offset() - \
>  	Returns a GEM VRAM object's offset in video memory
> @@ -214,7 +229,7 @@ s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo)
>  {
>  	if (WARN_ON_ONCE(!gbo->pin_count))
>  		return (s64)-ENODEV;
> -	return gbo->bo.offset;
> +	return drm_gem_vram_pg_offset(gbo) << PAGE_SHIFT;
>  }
>  EXPORT_SYMBOL(drm_gem_vram_offset);
> 
> --
> 2.25.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Christian König]

Am 05.03.20 um 14:29 schrieb Nirmoy Das:
> GPU address handling is device specific and should be handle by its device
> driver.
>
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>

Reviewed-by: Christian König <christian.koenig@amd.com>

> ---
>   drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>   include/drm/ttm/ttm_bo_api.h    | 2 --
>   include/drm/ttm/ttm_bo_driver.h | 1 -
>   3 files changed, 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 6d1e91be9c78..9f24fb287d71 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p
>   	drm_printf(p, "    has_type: %d\n", man->has_type);
>   	drm_printf(p, "    use_type: %d\n", man->use_type);
>   	drm_printf(p, "    flags: 0x%08X\n", man->flags);
> -	drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>   	drm_printf(p, "    size: %llu\n", man->size);
>   	drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
>   	drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
>   moved:
>   	bo->evicted = false;
>   
> -	if (bo->mem.mm_node)
> -		bo->offset = (bo->mem.start << PAGE_SHIFT) +
> -		    bdev->man[bo->mem.mem_type].gpu_offset;
> -	else
> -		bo->offset = 0;
> -
>   	ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>   	return 0;
>   
> diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
> index b9bc1b00142e..d6f39ee5bf5d 100644
> --- a/include/drm/ttm/ttm_bo_api.h
> +++ b/include/drm/ttm/ttm_bo_api.h
> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>   	 * either of these locks held.
>   	 */
>   
> -	uint64_t offset; /* GPU address space is independent of CPU word size */
> -
>   	struct sg_table *sg;
>   };
>   
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index c9e0fd09f4b2..c8ce6c181abe 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>   	bool has_type;
>   	bool use_type;
>   	uint32_t flags;
> -	uint64_t gpu_offset; /* GPU address space is independent of CPU word size */
>   	uint64_t size;
>   	uint32_t available_caching;
>   	uint32_t default_caching;

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[PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Nirmoy Das]

GPU address handling is device specific and should be handle by its device
driver.

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
 include/drm/ttm/ttm_bo_api.h    | 2 --
 include/drm/ttm/ttm_bo_driver.h | 1 -
 3 files changed, 10 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 6d1e91be9c78..9f24fb287d71 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p
 	drm_printf(p, "    has_type: %d\n", man->has_type);
 	drm_printf(p, "    use_type: %d\n", man->use_type);
 	drm_printf(p, "    flags: 0x%08X\n", man->flags);
-	drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
 	drm_printf(p, "    size: %llu\n", man->size);
 	drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
 	drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
@@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 moved:
 	bo->evicted = false;
 
-	if (bo->mem.mm_node)
-		bo->offset = (bo->mem.start << PAGE_SHIFT) +
-		    bdev->man[bo->mem.mem_type].gpu_offset;
-	else
-		bo->offset = 0;
-
 	ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 	return 0;
 
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index b9bc1b00142e..d6f39ee5bf5d 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -213,8 +213,6 @@ struct ttm_buffer_object {
 	 * either of these locks held.
 	 */
 
-	uint64_t offset; /* GPU address space is independent of CPU word size */
-
 	struct sg_table *sg;
 };
 
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index c9e0fd09f4b2..c8ce6c181abe 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
 	bool has_type;
 	bool use_type;
 	uint32_t flags;
-	uint64_t gpu_offset; /* GPU address space is independent of CPU word size */
 	uint64_t size;
 	uint32_t available_caching;
 	uint32_t default_caching;
-- 
2.25.0

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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Gerd Hoffmann]

  Hi,

> 2 unfortunately I can't say the same for bochs but it works with this patch
> series so I think bochs is fine as well.

bochs needs the offset only to scanout framebuffers, which in turn
requires framebuffers being pinned to vram.  So all green here.

cheers,
  Gerd

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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Christian König]

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Am 18.02.20 um 19:28 schrieb Thomas Zimmermann:
> Hi
>
> Am 18.02.20 um 19:23 schrieb Christian König:
>> Am 18.02.20 um 19:16 schrieb Thomas Zimmermann:
>>> Hi
>>>
>>> Am 18.02.20 um 18:13 schrieb Nirmoy:
>>>> On 2/18/20 1:44 PM, Christian König wrote:
>>>>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>>>>> Hi
>>>>>>
>>>>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>>>>> GPU address handling is device specific and should be handle by its
>>>>>>> device
>>>>>>> driver.
>>>>>>>
>>>>>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>>>>>> ---
>>>>>>>     drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>>>>>     include/drm/ttm/ttm_bo_api.h    | 2 --
>>>>>>>     include/drm/ttm/ttm_bo_driver.h | 1 -
>>>>>>>     3 files changed, 10 deletions(-)
>>>>>>>
>>>>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>>> index 151edfd8de77..d5885cd609a3 100644
>>>>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct
>>>>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>>>>>         drm_printf(p, "    has_type: %d\n", man->has_type);
>>>>>>>         drm_printf(p, "    use_type: %d\n", man->use_type);
>>>>>>>         drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>>>>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>>>>>         drm_printf(p, "    size: %llu\n", man->size);
>>>>>>>         drm_printf(p, "    available_caching: 0x%08X\n",
>>>>>>> man->available_caching);
>>>>>>>         drm_printf(p, "    default_caching: 0x%08X\n",
>>>>>>> man->default_caching);
>>>>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct
>>>>>>> ttm_buffer_object *bo,
>>>>>>>     moved:
>>>>>>>         bo->evicted = false;
>>>>>>>     -    if (bo->mem.mm_node)
>>>>>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>>>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>>>>>> -    else
>>>>>>> -        bo->offset = 0;
>>>>>>> -
>>>>>> After moving this into users, the else branch has been lost. Is
>>>>>> 'bo->mem.mm_node' always true?
>>>>> At least for the amdgpu and radeon use cases, yes.
>>>>>
>>>>> But that is a rather good question I mean for it is illegal to get the
>>>>> GPU BO address if it is inaccessible (e.g. in the system domain).
>>>>>
>>>>> Could be that some driver relied on the behavior to get 0 for the
>>>>> system domain here.
>>>> I wonder how to verify that ?
>>>>
>>>> If I understand correctly:
>>>>
>>>> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in
>>>> system domain.
>>>>
>>>> 2 unfortunately I can't say the same for bochs but it works with this
>>>> patch series so I think bochs is fine as well.
>>>>
>>>> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so
>>>> vmwgfx should be fine.
>>>>
>>>> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true
>>>>
>>>> I am not sure about  nouveau as bo->offset is being used in many places.
>>>>
>>>> I could probably mirror the removed logic to nouveau as
>>> I suggest to introduce a ttm helper that contains the original branching
>>> and use it everywhere. Something like
>>>
>>>     s64 ttm_bo_offset(struct ttm_buffer_object *bo)
>>>     {
>>>        if (WARN_ON_ONCE(!bo->mem.mm_node))
>>>            return 0;
>>>        return bo->mem.start << PAGE_SHIFT;
>>>     }
>>>
>>> Could be static inline. The warning should point to broken drivers. This
>>> also gets rid of the ugly shift in the drivers.
>> Big NAK on this. That is exactly what we should NOT do.
>>
>> See the shift belongs into the driver, because it is driver dependent if
>> we work with page or byte offsets.
>>
>> For amdgpu we for example want to work with byte offsets and TTM should
>> not make any assumption about what bo->mem.start actually contains.
> OK. What about something like ttm_bo_pg_offset()? Same code without the
> shift. Would also make it clear that it's a page offset.

That is a rather good idea. We could name that ttm_bo_man_offset() and 
put it into ttm_bo_manager.c next to the manager which allocates them.

It's just that this manager is not used by everybody, so amdgpu, radeon 
and nouveau would still need a separate function.

Christian.

>
> Best regards
> Thomas
>
>> Regards,
>> Christian.
>>
>>> Best regards
>>> Thomas
>>>
>>>
>>>> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
>>>> b/drivers/gpu/drm/nouveau/nouveau_bo.c
>>>> index f8015e0318d7..5a6a2af91318 100644
>>>> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
>>>> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
>>>> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object
>>>> *bo, bool evict,
>>>>                   list_for_each_entry(vma, &nvbo->vma_list, head) {
>>>>                           nouveau_vma_map(vma, mem);
>>>>                   }
>>>> +               if (bo->mem.mm_node)
>>>> +                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
>>>> +               else
>>>> +                       nvbo->offset = 0;
>>>>           } else {
>>>>                   list_for_each_entry(vma, &nvbo->vma_list, head) {
>>>>                           WARN_ON(ttm_bo_wait(bo, false, false));
>>>>
>>>> Regards,
>>>>
>>>> Nirmoy
>>>>
>>>>
>>>>> Regards,
>>>>> Christian.
>>>>>
>>>>>> Best regards
>>>>>> Thomas
>>>>>>
>>>>>>>         ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>>>>>         return 0;
>>>>>>>     diff --git a/include/drm/ttm/ttm_bo_api.h
>>>>>>> b/include/drm/ttm/ttm_bo_api.h
>>>>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>>>>>          * either of these locks held.
>>>>>>>          */
>>>>>>>     -    uint64_t offset; /* GPU address space is independent of CPU
>>>>>>> word size */
>>>>>>> -
>>>>>>>         struct sg_table *sg;
>>>>>>>     };
>>>>>>>     diff --git a/include/drm/ttm/ttm_bo_driver.h
>>>>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>>>>>         bool has_type;
>>>>>>>         bool use_type;
>>>>>>>         uint32_t flags;
>>>>>>> -    uint64_t gpu_offset; /* GPU address space is independent of CPU
>>>>>>> word size */
>>>>>>>         uint64_t size;
>>>>>>>         uint32_t available_caching;
>>>>>>>         uint32_t default_caching;
>>>>>>>
>>>> _______________________________________________
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>> _______________________________________________
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>
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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Nirmoy]

On 2/18/20 7:16 PM, Thomas Zimmermann wrote:
> Hi
>
> Am 18.02.20 um 18:13 schrieb Nirmoy:
>> On 2/18/20 1:44 PM, Christian König wrote:
>>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>>> Hi
>>>>
>>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>>> GPU address handling is device specific and should be handle by its
>>>>> device
>>>>> driver.
>>>>>
>>>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>>>> ---
>>>>>    drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>>>    include/drm/ttm/ttm_bo_api.h    | 2 --
>>>>>    include/drm/ttm/ttm_bo_driver.h | 1 -
>>>>>    3 files changed, 10 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> index 151edfd8de77..d5885cd609a3 100644
>>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct
>>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>>>        drm_printf(p, "    has_type: %d\n", man->has_type);
>>>>>        drm_printf(p, "    use_type: %d\n", man->use_type);
>>>>>        drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>>>        drm_printf(p, "    size: %llu\n", man->size);
>>>>>        drm_printf(p, "    available_caching: 0x%08X\n",
>>>>> man->available_caching);
>>>>>        drm_printf(p, "    default_caching: 0x%08X\n",
>>>>> man->default_caching);
>>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct
>>>>> ttm_buffer_object *bo,
>>>>>    moved:
>>>>>        bo->evicted = false;
>>>>>    -    if (bo->mem.mm_node)
>>>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>>>> -    else
>>>>> -        bo->offset = 0;
>>>>> -
>>>> After moving this into users, the else branch has been lost. Is
>>>> 'bo->mem.mm_node' always true?
>>> At least for the amdgpu and radeon use cases, yes.
>>>
>>> But that is a rather good question I mean for it is illegal to get the
>>> GPU BO address if it is inaccessible (e.g. in the system domain).
>>>
>>> Could be that some driver relied on the behavior to get 0 for the
>>> system domain here.
>> I wonder how to verify that ?
>>
>> If I understand correctly:
>>
>> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in
>> system domain.
>>
>> 2 unfortunately I can't say the same for bochs but it works with this
>> patch series so I think bochs is fine as well.
>>
>> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so
>> vmwgfx should be fine.
>>
>> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true
>>
>> I am not sure about  nouveau as bo->offset is being used in many places.
>>
>> I could probably mirror the removed logic to nouveau as
> I suggest to introduce a ttm helper that contains the original branching
> and use it everywhere. Something like
>
>    s64 ttm_bo_offset(struct ttm_buffer_object *bo)
>    {
>       if (WARN_ON_ONCE(!bo->mem.mm_node))
>           return 0;
>       return bo->mem.start << PAGE_SHIFT;
>    }
>
> Could be static inline. The warning should point to broken drivers. This
> also gets rid of the ugly shift in the drivers.

The idea here is to remove this GPU memory offset calculation and 
reference completely

from ttm and let drivers decide how to handle that. Drivers are full of 
ugly shift anyway imho :)

Regards,

Nirmoy

>
> Best regards
> Thomas
>
>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
>> b/drivers/gpu/drm/nouveau/nouveau_bo.c
>> index f8015e0318d7..5a6a2af91318 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
>> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object
>> *bo, bool evict,
>>                  list_for_each_entry(vma, &nvbo->vma_list, head) {
>>                          nouveau_vma_map(vma, mem);
>>                  }
>> +               if (bo->mem.mm_node)
>> +                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
>> +               else
>> +                       nvbo->offset = 0;
>>          } else {
>>                  list_for_each_entry(vma, &nvbo->vma_list, head) {
>>                          WARN_ON(ttm_bo_wait(bo, false, false));
>>
>> Regards,
>>
>> Nirmoy
>>
>>
>>> Regards,
>>> Christian.
>>>
>>>> Best regards
>>>> Thomas
>>>>
>>>>>        ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>>>        return 0;
>>>>>    diff --git a/include/drm/ttm/ttm_bo_api.h
>>>>> b/include/drm/ttm/ttm_bo_api.h
>>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>>>         * either of these locks held.
>>>>>         */
>>>>>    -    uint64_t offset; /* GPU address space is independent of CPU
>>>>> word size */
>>>>> -
>>>>>        struct sg_table *sg;
>>>>>    };
>>>>>    diff --git a/include/drm/ttm/ttm_bo_driver.h
>>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>>>        bool has_type;
>>>>>        bool use_type;
>>>>>        uint32_t flags;
>>>>> -    uint64_t gpu_offset; /* GPU address space is independent of CPU
>>>>> word size */
>>>>>        uint64_t size;
>>>>>        uint32_t available_caching;
>>>>>        uint32_t default_caching;
>>>>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
_______________________________________________
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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Thomas Zimmermann]

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Hi

Am 18.02.20 um 19:23 schrieb Christian König:
> Am 18.02.20 um 19:16 schrieb Thomas Zimmermann:
>> Hi
>>
>> Am 18.02.20 um 18:13 schrieb Nirmoy:
>>> On 2/18/20 1:44 PM, Christian König wrote:
>>>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>>>> Hi
>>>>>
>>>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>>>> GPU address handling is device specific and should be handle by its
>>>>>> device
>>>>>> driver.
>>>>>>
>>>>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>>>>> ---
>>>>>>    drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>>>>    include/drm/ttm/ttm_bo_api.h    | 2 --
>>>>>>    include/drm/ttm/ttm_bo_driver.h | 1 -
>>>>>>    3 files changed, 10 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>> index 151edfd8de77..d5885cd609a3 100644
>>>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct
>>>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>>>>        drm_printf(p, "    has_type: %d\n", man->has_type);
>>>>>>        drm_printf(p, "    use_type: %d\n", man->use_type);
>>>>>>        drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>>>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>>>>        drm_printf(p, "    size: %llu\n", man->size);
>>>>>>        drm_printf(p, "    available_caching: 0x%08X\n",
>>>>>> man->available_caching);
>>>>>>        drm_printf(p, "    default_caching: 0x%08X\n",
>>>>>> man->default_caching);
>>>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct
>>>>>> ttm_buffer_object *bo,
>>>>>>    moved:
>>>>>>        bo->evicted = false;
>>>>>>    -    if (bo->mem.mm_node)
>>>>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>>>>> -    else
>>>>>> -        bo->offset = 0;
>>>>>> -
>>>>> After moving this into users, the else branch has been lost. Is
>>>>> 'bo->mem.mm_node' always true?
>>>> At least for the amdgpu and radeon use cases, yes.
>>>>
>>>> But that is a rather good question I mean for it is illegal to get the
>>>> GPU BO address if it is inaccessible (e.g. in the system domain).
>>>>
>>>> Could be that some driver relied on the behavior to get 0 for the
>>>> system domain here.
>>> I wonder how to verify that ?
>>>
>>> If I understand correctly:
>>>
>>> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in
>>> system domain.
>>>
>>> 2 unfortunately I can't say the same for bochs but it works with this
>>> patch series so I think bochs is fine as well.
>>>
>>> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so
>>> vmwgfx should be fine.
>>>
>>> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true
>>>
>>> I am not sure about  nouveau as bo->offset is being used in many places.
>>>
>>> I could probably mirror the removed logic to nouveau as
>> I suggest to introduce a ttm helper that contains the original branching
>> and use it everywhere. Something like
>>
>>    s64 ttm_bo_offset(struct ttm_buffer_object *bo)
>>    {
>>       if (WARN_ON_ONCE(!bo->mem.mm_node))
>>           return 0;
>>       return bo->mem.start << PAGE_SHIFT;
>>    }
>>
>> Could be static inline. The warning should point to broken drivers. This
>> also gets rid of the ugly shift in the drivers.
> 
> Big NAK on this. That is exactly what we should NOT do.
> 
> See the shift belongs into the driver, because it is driver dependent if
> we work with page or byte offsets.
> 
> For amdgpu we for example want to work with byte offsets and TTM should
> not make any assumption about what bo->mem.start actually contains.

OK. What about something like ttm_bo_pg_offset()? Same code without the
shift. Would also make it clear that it's a page offset.

Best regards
Thomas

> 
> Regards,
> Christian.
> 
>>
>> Best regards
>> Thomas
>>
>>
>>> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
>>> b/drivers/gpu/drm/nouveau/nouveau_bo.c
>>> index f8015e0318d7..5a6a2af91318 100644
>>> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
>>> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
>>> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object
>>> *bo, bool evict,
>>>                  list_for_each_entry(vma, &nvbo->vma_list, head) {
>>>                          nouveau_vma_map(vma, mem);
>>>                  }
>>> +               if (bo->mem.mm_node)
>>> +                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
>>> +               else
>>> +                       nvbo->offset = 0;
>>>          } else {
>>>                  list_for_each_entry(vma, &nvbo->vma_list, head) {
>>>                          WARN_ON(ttm_bo_wait(bo, false, false));
>>>
>>> Regards,
>>>
>>> Nirmoy
>>>
>>>
>>>> Regards,
>>>> Christian.
>>>>
>>>>> Best regards
>>>>> Thomas
>>>>>
>>>>>>        ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>>>>        return 0;
>>>>>>    diff --git a/include/drm/ttm/ttm_bo_api.h
>>>>>> b/include/drm/ttm/ttm_bo_api.h
>>>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>>>>         * either of these locks held.
>>>>>>         */
>>>>>>    -    uint64_t offset; /* GPU address space is independent of CPU
>>>>>> word size */
>>>>>> -
>>>>>>        struct sg_table *sg;
>>>>>>    };
>>>>>>    diff --git a/include/drm/ttm/ttm_bo_driver.h
>>>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>>>>        bool has_type;
>>>>>>        bool use_type;
>>>>>>        uint32_t flags;
>>>>>> -    uint64_t gpu_offset; /* GPU address space is independent of CPU
>>>>>> word size */
>>>>>>        uint64_t size;
>>>>>>        uint32_t available_caching;
>>>>>>        uint32_t default_caching;
>>>>>>
>>> _______________________________________________
>>> 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

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Christian König]

Am 18.02.20 um 19:16 schrieb Thomas Zimmermann:
> Hi
>
> Am 18.02.20 um 18:13 schrieb Nirmoy:
>> On 2/18/20 1:44 PM, Christian König wrote:
>>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>>> Hi
>>>>
>>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>>> GPU address handling is device specific and should be handle by its
>>>>> device
>>>>> driver.
>>>>>
>>>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>>>> ---
>>>>>    drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>>>    include/drm/ttm/ttm_bo_api.h    | 2 --
>>>>>    include/drm/ttm/ttm_bo_driver.h | 1 -
>>>>>    3 files changed, 10 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> index 151edfd8de77..d5885cd609a3 100644
>>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct
>>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>>>        drm_printf(p, "    has_type: %d\n", man->has_type);
>>>>>        drm_printf(p, "    use_type: %d\n", man->use_type);
>>>>>        drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>>>        drm_printf(p, "    size: %llu\n", man->size);
>>>>>        drm_printf(p, "    available_caching: 0x%08X\n",
>>>>> man->available_caching);
>>>>>        drm_printf(p, "    default_caching: 0x%08X\n",
>>>>> man->default_caching);
>>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct
>>>>> ttm_buffer_object *bo,
>>>>>    moved:
>>>>>        bo->evicted = false;
>>>>>    -    if (bo->mem.mm_node)
>>>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>>>> -    else
>>>>> -        bo->offset = 0;
>>>>> -
>>>> After moving this into users, the else branch has been lost. Is
>>>> 'bo->mem.mm_node' always true?
>>> At least for the amdgpu and radeon use cases, yes.
>>>
>>> But that is a rather good question I mean for it is illegal to get the
>>> GPU BO address if it is inaccessible (e.g. in the system domain).
>>>
>>> Could be that some driver relied on the behavior to get 0 for the
>>> system domain here.
>> I wonder how to verify that ?
>>
>> If I understand correctly:
>>
>> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in
>> system domain.
>>
>> 2 unfortunately I can't say the same for bochs but it works with this
>> patch series so I think bochs is fine as well.
>>
>> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so
>> vmwgfx should be fine.
>>
>> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true
>>
>> I am not sure about  nouveau as bo->offset is being used in many places.
>>
>> I could probably mirror the removed logic to nouveau as
> I suggest to introduce a ttm helper that contains the original branching
> and use it everywhere. Something like
>
>    s64 ttm_bo_offset(struct ttm_buffer_object *bo)
>    {
>       if (WARN_ON_ONCE(!bo->mem.mm_node))
>           return 0;
>       return bo->mem.start << PAGE_SHIFT;
>    }
>
> Could be static inline. The warning should point to broken drivers. This
> also gets rid of the ugly shift in the drivers.

Big NAK on this. That is exactly what we should NOT do.

See the shift belongs into the driver, because it is driver dependent if 
we work with page or byte offsets.

For amdgpu we for example want to work with byte offsets and TTM should 
not make any assumption about what bo->mem.start actually contains.

Regards,
Christian.

>
> Best regards
> Thomas
>
>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
>> b/drivers/gpu/drm/nouveau/nouveau_bo.c
>> index f8015e0318d7..5a6a2af91318 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
>> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object
>> *bo, bool evict,
>>                  list_for_each_entry(vma, &nvbo->vma_list, head) {
>>                          nouveau_vma_map(vma, mem);
>>                  }
>> +               if (bo->mem.mm_node)
>> +                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
>> +               else
>> +                       nvbo->offset = 0;
>>          } else {
>>                  list_for_each_entry(vma, &nvbo->vma_list, head) {
>>                          WARN_ON(ttm_bo_wait(bo, false, false));
>>
>> Regards,
>>
>> Nirmoy
>>
>>
>>> Regards,
>>> Christian.
>>>
>>>> Best regards
>>>> Thomas
>>>>
>>>>>        ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>>>        return 0;
>>>>>    diff --git a/include/drm/ttm/ttm_bo_api.h
>>>>> b/include/drm/ttm/ttm_bo_api.h
>>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>>>         * either of these locks held.
>>>>>         */
>>>>>    -    uint64_t offset; /* GPU address space is independent of CPU
>>>>> word size */
>>>>> -
>>>>>        struct sg_table *sg;
>>>>>    };
>>>>>    diff --git a/include/drm/ttm/ttm_bo_driver.h
>>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>>>        bool has_type;
>>>>>        bool use_type;
>>>>>        uint32_t flags;
>>>>> -    uint64_t gpu_offset; /* GPU address space is independent of CPU
>>>>> word size */
>>>>>        uint64_t size;
>>>>>        uint32_t available_caching;
>>>>>        uint32_t default_caching;
>>>>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Thomas Zimmermann]

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Hi

Am 18.02.20 um 18:13 schrieb Nirmoy:
> 
> On 2/18/20 1:44 PM, Christian König wrote:
>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>> Hi
>>>
>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>> GPU address handling is device specific and should be handle by its
>>>> device
>>>> driver.
>>>>
>>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>>> ---
>>>>   drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>>   include/drm/ttm/ttm_bo_api.h    | 2 --
>>>>   include/drm/ttm/ttm_bo_driver.h | 1 -
>>>>   3 files changed, 10 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>> index 151edfd8de77..d5885cd609a3 100644
>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct
>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>>       drm_printf(p, "    has_type: %d\n", man->has_type);
>>>>       drm_printf(p, "    use_type: %d\n", man->use_type);
>>>>       drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>>       drm_printf(p, "    size: %llu\n", man->size);
>>>>       drm_printf(p, "    available_caching: 0x%08X\n",
>>>> man->available_caching);
>>>>       drm_printf(p, "    default_caching: 0x%08X\n",
>>>> man->default_caching);
>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct
>>>> ttm_buffer_object *bo,
>>>>   moved:
>>>>       bo->evicted = false;
>>>>   -    if (bo->mem.mm_node)
>>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>>> -    else
>>>> -        bo->offset = 0;
>>>> -
>>> After moving this into users, the else branch has been lost. Is
>>> 'bo->mem.mm_node' always true?
>>
>> At least for the amdgpu and radeon use cases, yes.
>>
>> But that is a rather good question I mean for it is illegal to get the
>> GPU BO address if it is inaccessible (e.g. in the system domain).
>>
>> Could be that some driver relied on the behavior to get 0 for the
>> system domain here.
> 
> I wonder how to verify that ?
> 
> If I understand correctly:
> 
> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in 
> system domain.
> 
> 2 unfortunately I can't say the same for bochs but it works with this
> patch series so I think bochs is fine as well.
> 
> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so
> vmwgfx should be fine.
> 
> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true
> 
> I am not sure about  nouveau as bo->offset is being used in many places.
> 
> I could probably mirror the removed logic to nouveau as

I suggest to introduce a ttm helper that contains the original branching
and use it everywhere. Something like

  s64 ttm_bo_offset(struct ttm_buffer_object *bo)
  {
     if (WARN_ON_ONCE(!bo->mem.mm_node))
         return 0;
     return bo->mem.start << PAGE_SHIFT;
  }

Could be static inline. The warning should point to broken drivers. This
also gets rid of the ugly shift in the drivers.

Best regards
Thomas


> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c
> b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index f8015e0318d7..5a6a2af91318 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object
> *bo, bool evict,
>                 list_for_each_entry(vma, &nvbo->vma_list, head) {
>                         nouveau_vma_map(vma, mem);
>                 }
> +               if (bo->mem.mm_node)
> +                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
> +               else
> +                       nvbo->offset = 0;
>         } else {
>                 list_for_each_entry(vma, &nvbo->vma_list, head) {
>                         WARN_ON(ttm_bo_wait(bo, false, false));
> 
> Regards,
> 
> Nirmoy
> 
> 
>>
>> Regards,
>> Christian.
>>
>>>
>>> Best regards
>>> Thomas
>>>
>>>>       ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>>       return 0;
>>>>   diff --git a/include/drm/ttm/ttm_bo_api.h
>>>> b/include/drm/ttm/ttm_bo_api.h
>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>>        * either of these locks held.
>>>>        */
>>>>   -    uint64_t offset; /* GPU address space is independent of CPU
>>>> word size */
>>>> -
>>>>       struct sg_table *sg;
>>>>   };
>>>>   diff --git a/include/drm/ttm/ttm_bo_driver.h
>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>>       bool has_type;
>>>>       bool use_type;
>>>>       uint32_t flags;
>>>> -    uint64_t gpu_offset; /* GPU address space is independent of CPU
>>>> word size */
>>>>       uint64_t size;
>>>>       uint32_t available_caching;
>>>>       uint32_t default_caching;
>>>>
>>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Christian König]

Am 18.02.20 um 18:13 schrieb Nirmoy:
>
> On 2/18/20 1:44 PM, Christian König wrote:
>> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>>> Hi
>>>
>>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>>> GPU address handling is device specific and should be handle by its 
>>>> device
>>>> driver.
>>>>
>>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>>> ---
>>>>   drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>>   include/drm/ttm/ttm_bo_api.h    | 2 --
>>>>   include/drm/ttm/ttm_bo_driver.h | 1 -
>>>>   3 files changed, 10 deletions(-)
>>>>
>>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c 
>>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>>> index 151edfd8de77..d5885cd609a3 100644
>>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct 
>>>> ttm_bo_device *bdev, struct drm_printer *p
>>>>       drm_printf(p, "    has_type: %d\n", man->has_type);
>>>>       drm_printf(p, "    use_type: %d\n", man->use_type);
>>>>       drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>>       drm_printf(p, "    size: %llu\n", man->size);
>>>>       drm_printf(p, "    available_caching: 0x%08X\n", 
>>>> man->available_caching);
>>>>       drm_printf(p, "    default_caching: 0x%08X\n", 
>>>> man->default_caching);
>>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct 
>>>> ttm_buffer_object *bo,
>>>>   moved:
>>>>       bo->evicted = false;
>>>>   -    if (bo->mem.mm_node)
>>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>>> -    else
>>>> -        bo->offset = 0;
>>>> -
>>> After moving this into users, the else branch has been lost. Is
>>> 'bo->mem.mm_node' always true?
>>
>> At least for the amdgpu and radeon use cases, yes.
>>
>> But that is a rather good question I mean for it is illegal to get 
>> the GPU BO address if it is inaccessible (e.g. in the system domain).
>>
>> Could be that some driver relied on the behavior to get 0 for the 
>> system domain here.
>
> I wonder how to verify that ?

No idea, but I wouldn't worry to much about that.

>
> If I understand correctly:
>
> 1 qxl uses bo->offset only in qxl_bo_physical_address() which is not 
> in  system domain.
>
> 2 unfortunately I can't say the same for bochs but it works with this 
> patch series so I think bochs is fine as well.
>
> 3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so 
> vmwgfx should be fine.
>
> 4 amdgpu and radeon runs with 'bo->mem.mm_node' always true

That sounds like those four are ok to me.

>
> I am not sure about  nouveau as bo->offset is being used in many places.
>
> I could probably mirror the removed logic to nouveau as
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c 
> b/drivers/gpu/drm/nouveau/nouveau_bo.c
> index f8015e0318d7..5a6a2af91318 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> @@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object 
> *bo, bool evict,
>                 list_for_each_entry(vma, &nvbo->vma_list, head) {
>                         nouveau_vma_map(vma, mem);
>                 }
> +               if (bo->mem.mm_node)
> +                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
> +               else
> +                       nvbo->offset = 0;
>         } else {
>                 list_for_each_entry(vma, &nvbo->vma_list, head) {
>                         WARN_ON(ttm_bo_wait(bo, false, false));

Yeah, I would go down that route.

Christian.

>
> Regards,
>
> Nirmoy
>
>
>>
>> Regards,
>> Christian.
>>
>>>
>>> Best regards
>>> Thomas
>>>
>>>>       ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>>       return 0;
>>>>   diff --git a/include/drm/ttm/ttm_bo_api.h 
>>>> b/include/drm/ttm/ttm_bo_api.h
>>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>>> --- a/include/drm/ttm/ttm_bo_api.h
>>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>>        * either of these locks held.
>>>>        */
>>>>   -    uint64_t offset; /* GPU address space is independent of CPU 
>>>> word size */
>>>> -
>>>>       struct sg_table *sg;
>>>>   };
>>>>   diff --git a/include/drm/ttm/ttm_bo_driver.h 
>>>> b/include/drm/ttm/ttm_bo_driver.h
>>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>>       bool has_type;
>>>>       bool use_type;
>>>>       uint32_t flags;
>>>> -    uint64_t gpu_offset; /* GPU address space is independent of 
>>>> CPU word size */
>>>>       uint64_t size;
>>>>       uint32_t available_caching;
>>>>       uint32_t default_caching;
>>>>
>>
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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Nirmoy]

On 2/18/20 1:44 PM, Christian König wrote:
> Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
>> Hi
>>
>> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>>> GPU address handling is device specific and should be handle by its 
>>> device
>>> driver.
>>>
>>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>>> ---
>>>   drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>>   include/drm/ttm/ttm_bo_api.h    | 2 --
>>>   include/drm/ttm/ttm_bo_driver.h | 1 -
>>>   3 files changed, 10 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c 
>>> b/drivers/gpu/drm/ttm/ttm_bo.c
>>> index 151edfd8de77..d5885cd609a3 100644
>>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct 
>>> ttm_bo_device *bdev, struct drm_printer *p
>>>       drm_printf(p, "    has_type: %d\n", man->has_type);
>>>       drm_printf(p, "    use_type: %d\n", man->use_type);
>>>       drm_printf(p, "    flags: 0x%08X\n", man->flags);
>>> -    drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>>       drm_printf(p, "    size: %llu\n", man->size);
>>>       drm_printf(p, "    available_caching: 0x%08X\n", 
>>> man->available_caching);
>>>       drm_printf(p, "    default_caching: 0x%08X\n", 
>>> man->default_caching);
>>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct 
>>> ttm_buffer_object *bo,
>>>   moved:
>>>       bo->evicted = false;
>>>   -    if (bo->mem.mm_node)
>>> -        bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>> -            bdev->man[bo->mem.mem_type].gpu_offset;
>>> -    else
>>> -        bo->offset = 0;
>>> -
>> After moving this into users, the else branch has been lost. Is
>> 'bo->mem.mm_node' always true?
>
> At least for the amdgpu and radeon use cases, yes.
>
> But that is a rather good question I mean for it is illegal to get the 
> GPU BO address if it is inaccessible (e.g. in the system domain).
>
> Could be that some driver relied on the behavior to get 0 for the 
> system domain here.

I wonder how to verify that ?

If I understand correctly:

1 qxl uses bo->offset only in qxl_bo_physical_address() which is not in  
system domain.

2 unfortunately I can't say the same for bochs but it works with this 
patch series so I think bochs is fine as well.

3 vmwgfx uses bo->offset only when bo->mem.mem_type == TTM_PL_VRAM so 
vmwgfx should be fine.

4 amdgpu and radeon runs with 'bo->mem.mm_node' always true

I am not sure about  nouveau as bo->offset is being used in many places.

I could probably mirror the removed logic to nouveau as

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c 
b/drivers/gpu/drm/nouveau/nouveau_bo.c
index f8015e0318d7..5a6a2af91318 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1317,6 +1317,10 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object 
*bo, bool evict,
                 list_for_each_entry(vma, &nvbo->vma_list, head) {
                         nouveau_vma_map(vma, mem);
                 }
+               if (bo->mem.mm_node)
+                       nvbo->offset = (new_reg->start << PAGE_SHIFT);
+               else
+                       nvbo->offset = 0;
         } else {
                 list_for_each_entry(vma, &nvbo->vma_list, head) {
                         WARN_ON(ttm_bo_wait(bo, false, false));

Regards,

Nirmoy


>
> Regards,
> Christian.
>
>>
>> Best regards
>> Thomas
>>
>>>       ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>>       return 0;
>>>   diff --git a/include/drm/ttm/ttm_bo_api.h 
>>> b/include/drm/ttm/ttm_bo_api.h
>>> index b9bc1b00142e..d6f39ee5bf5d 100644
>>> --- a/include/drm/ttm/ttm_bo_api.h
>>> +++ b/include/drm/ttm/ttm_bo_api.h
>>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>>        * either of these locks held.
>>>        */
>>>   -    uint64_t offset; /* GPU address space is independent of CPU 
>>> word size */
>>> -
>>>       struct sg_table *sg;
>>>   };
>>>   diff --git a/include/drm/ttm/ttm_bo_driver.h 
>>> b/include/drm/ttm/ttm_bo_driver.h
>>> index c9e0fd09f4b2..c8ce6c181abe 100644
>>> --- a/include/drm/ttm/ttm_bo_driver.h
>>> +++ b/include/drm/ttm/ttm_bo_driver.h
>>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>>       bool has_type;
>>>       bool use_type;
>>>       uint32_t flags;
>>> -    uint64_t gpu_offset; /* GPU address space is independent of CPU 
>>> word size */
>>>       uint64_t size;
>>>       uint32_t available_caching;
>>>       uint32_t default_caching;
>>>
>
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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Christian König]

Am 18.02.20 um 13:40 schrieb Thomas Zimmermann:
> Hi
>
> Am 17.02.20 um 16:04 schrieb Nirmoy Das:
>> GPU address handling is device specific and should be handle by its device
>> driver.
>>
>> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
>> ---
>>   drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>>   include/drm/ttm/ttm_bo_api.h    | 2 --
>>   include/drm/ttm/ttm_bo_driver.h | 1 -
>>   3 files changed, 10 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
>> index 151edfd8de77..d5885cd609a3 100644
>> --- a/drivers/gpu/drm/ttm/ttm_bo.c
>> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
>> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p
>>   	drm_printf(p, "    has_type: %d\n", man->has_type);
>>   	drm_printf(p, "    use_type: %d\n", man->use_type);
>>   	drm_printf(p, "    flags: 0x%08X\n", man->flags);
>> -	drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>>   	drm_printf(p, "    size: %llu\n", man->size);
>>   	drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
>>   	drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
>> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
>>   moved:
>>   	bo->evicted = false;
>>   
>> -	if (bo->mem.mm_node)
>> -		bo->offset = (bo->mem.start << PAGE_SHIFT) +
>> -		    bdev->man[bo->mem.mem_type].gpu_offset;
>> -	else
>> -		bo->offset = 0;
>> -
> After moving this into users, the else branch has been lost. Is
> 'bo->mem.mm_node' always true?

At least for the amdgpu and radeon use cases, yes.

But that is a rather good question I mean for it is illegal to get the 
GPU BO address if it is inaccessible (e.g. in the system domain).

Could be that some driver relied on the behavior to get 0 for the system 
domain here.

Regards,
Christian.

>
> Best regards
> Thomas
>
>>   	ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>>   	return 0;
>>   
>> diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
>> index b9bc1b00142e..d6f39ee5bf5d 100644
>> --- a/include/drm/ttm/ttm_bo_api.h
>> +++ b/include/drm/ttm/ttm_bo_api.h
>> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>>   	 * either of these locks held.
>>   	 */
>>   
>> -	uint64_t offset; /* GPU address space is independent of CPU word size */
>> -
>>   	struct sg_table *sg;
>>   };
>>   
>> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
>> index c9e0fd09f4b2..c8ce6c181abe 100644
>> --- a/include/drm/ttm/ttm_bo_driver.h
>> +++ b/include/drm/ttm/ttm_bo_driver.h
>> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>>   	bool has_type;
>>   	bool use_type;
>>   	uint32_t flags;
>> -	uint64_t gpu_offset; /* GPU address space is independent of CPU word size */
>>   	uint64_t size;
>>   	uint32_t available_caching;
>>   	uint32_t default_caching;
>>

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Re: [PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Thomas Zimmermann]

[-- Attachment #1.1.1: Type: text/plain, Size: 2710 bytes --]

Hi

Am 17.02.20 um 16:04 schrieb Nirmoy Das:
> GPU address handling is device specific and should be handle by its device
> driver.
> 
> Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
> ---
>  drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
>  include/drm/ttm/ttm_bo_api.h    | 2 --
>  include/drm/ttm/ttm_bo_driver.h | 1 -
>  3 files changed, 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 151edfd8de77..d5885cd609a3 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p
>  	drm_printf(p, "    has_type: %d\n", man->has_type);
>  	drm_printf(p, "    use_type: %d\n", man->use_type);
>  	drm_printf(p, "    flags: 0x%08X\n", man->flags);
> -	drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
>  	drm_printf(p, "    size: %llu\n", man->size);
>  	drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
>  	drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
> @@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
>  moved:
>  	bo->evicted = false;
>  
> -	if (bo->mem.mm_node)
> -		bo->offset = (bo->mem.start << PAGE_SHIFT) +
> -		    bdev->man[bo->mem.mem_type].gpu_offset;
> -	else
> -		bo->offset = 0;
> -

After moving this into users, the else branch has been lost. Is
'bo->mem.mm_node' always true?

Best regards
Thomas

>  	ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
>  	return 0;
>  
> diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
> index b9bc1b00142e..d6f39ee5bf5d 100644
> --- a/include/drm/ttm/ttm_bo_api.h
> +++ b/include/drm/ttm/ttm_bo_api.h
> @@ -213,8 +213,6 @@ struct ttm_buffer_object {
>  	 * either of these locks held.
>  	 */
>  
> -	uint64_t offset; /* GPU address space is independent of CPU word size */
> -
>  	struct sg_table *sg;
>  };
>  
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index c9e0fd09f4b2..c8ce6c181abe 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
>  	bool has_type;
>  	bool use_type;
>  	uint32_t flags;
> -	uint64_t gpu_offset; /* GPU address space is independent of CPU word size */
>  	uint64_t size;
>  	uint32_t available_caching;
>  	uint32_t default_caching;
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer


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[-- Attachment #2: Type: text/plain, Size: 154 bytes --]

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[PATCH 8/8] drm/ttm: do not keep GPU dependent addresses

[Nirmoy Das]

GPU address handling is device specific and should be handle by its device
driver.

Signed-off-by: Nirmoy Das <nirmoy.das@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c    | 7 -------
 include/drm/ttm/ttm_bo_api.h    | 2 --
 include/drm/ttm/ttm_bo_driver.h | 1 -
 3 files changed, 10 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 151edfd8de77..d5885cd609a3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -85,7 +85,6 @@ static void ttm_mem_type_debug(struct ttm_bo_device *bdev, struct drm_printer *p
 	drm_printf(p, "    has_type: %d\n", man->has_type);
 	drm_printf(p, "    use_type: %d\n", man->use_type);
 	drm_printf(p, "    flags: 0x%08X\n", man->flags);
-	drm_printf(p, "    gpu_offset: 0x%08llX\n", man->gpu_offset);
 	drm_printf(p, "    size: %llu\n", man->size);
 	drm_printf(p, "    available_caching: 0x%08X\n", man->available_caching);
 	drm_printf(p, "    default_caching: 0x%08X\n", man->default_caching);
@@ -345,12 +344,6 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
 moved:
 	bo->evicted = false;
 
-	if (bo->mem.mm_node)
-		bo->offset = (bo->mem.start << PAGE_SHIFT) +
-		    bdev->man[bo->mem.mem_type].gpu_offset;
-	else
-		bo->offset = 0;
-
 	ctx->bytes_moved += bo->num_pages << PAGE_SHIFT;
 	return 0;
 
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index b9bc1b00142e..d6f39ee5bf5d 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -213,8 +213,6 @@ struct ttm_buffer_object {
 	 * either of these locks held.
 	 */
 
-	uint64_t offset; /* GPU address space is independent of CPU word size */
-
 	struct sg_table *sg;
 };
 
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index c9e0fd09f4b2..c8ce6c181abe 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -177,7 +177,6 @@ struct ttm_mem_type_manager {
 	bool has_type;
 	bool use_type;
 	uint32_t flags;
-	uint64_t gpu_offset; /* GPU address space is independent of CPU word size */
 	uint64_t size;
 	uint32_t available_caching;
 	uint32_t default_caching;
-- 
2.25.0

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