drm/radeon/kms: add support for new fault callback V7

This add the support for the new fault callback and also the
infrastructure for supporting unmappable VRAM.

V2 validate BO with no_wait = true
V3 don't derefence bo->mem.mm_node as it's not NULL only for
   VRAM or GTT
V4 update to splitted no_wait ttm change
V5 update to new balanced io_mem_reserve/free change
V6 callback is responsible for iomapping memory
V7 move back iomapping to ttm

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

3 files changed, 72 insertions, 7 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 4b441f87f47a..57b3f95c0efa 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -498,11 +498,33 @@ void radeon_bo_move_notify(struct ttm_buffer_object *bo,
         radeon_bo_check_tiling(rbo, 0, 1);
 }
 
-void radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
+int radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
 {
+        struct radeon_device *rdev;
         struct radeon_bo *rbo;
+        unsigned long offset, size;
+        int r;
+
         if (!radeon_ttm_bo_is_radeon_bo(bo))
-                return;
+                return 0;
         rbo = container_of(bo, struct radeon_bo, tbo);
         radeon_bo_check_tiling(rbo, 0, 0);
+        rdev = rbo->rdev;
+        if (bo->mem.mem_type == TTM_PL_VRAM) {
+                size = bo->mem.num_pages << PAGE_SHIFT;
+                offset = bo->mem.mm_node->start << PAGE_SHIFT;
+                if ((offset + size) > rdev->mc.visible_vram_size) {
+                        /* hurrah the memory is not visible ! */
+                        radeon_ttm_placement_from_domain(rbo, RADEON_GEM_DOMAIN_VRAM);
+                        rbo->placement.lpfn = rdev->mc.visible_vram_size >> PAGE_SHIFT;
+                        r = ttm_bo_validate(bo, &rbo->placement, false, true, false);
+                        if (unlikely(r != 0))
+                                return r;
+                        offset = bo->mem.mm_node->start << PAGE_SHIFT;
+                        /* this should not happen */
+                        if ((offset + size) > rdev->mc.visible_vram_size)
+                                return -EINVAL;
+                }
+        }
+        return 0;
 }
diff --git a/drivers/gpu/drm/radeon/radeon_object.h b/drivers/gpu/drm/radeon/radeon_object.h
index 7ab43de1e244..353998dc2c03 100644
--- a/drivers/gpu/drm/radeon/radeon_object.h
+++ b/drivers/gpu/drm/radeon/radeon_object.h
@@ -168,6 +168,6 @@ extern int radeon_bo_check_tiling(struct radeon_bo *bo, bool has_moved,
                                 bool force_drop);
 extern void radeon_bo_move_notify(struct ttm_buffer_object *bo,
                                         struct ttm_mem_reg *mem);
-extern void radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo);
+extern int radeon_bo_fault_reserve_notify(struct ttm_buffer_object *bo);
 extern int radeon_bo_get_surface_reg(struct radeon_bo *bo);
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index ba4724c38ac0..62b4b800e0a3 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -165,8 +165,7 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
                         man->io_size = rdev->mc.gtt_size;
                         man->io_addr = NULL;
                         if (!rdev->ddev->agp->cant_use_aperture)
-                                man->flags = TTM_MEMTYPE_FLAG_NEEDS_IOREMAP |
-                                             TTM_MEMTYPE_FLAG_MAPPABLE;
+                                man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
                         man->available_caching = TTM_PL_FLAG_UNCACHED |
                                                  TTM_PL_FLAG_WC;
                         man->default_caching = TTM_PL_FLAG_WC;
@@ -182,7 +181,6 @@ static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
                 /* "On-card" video ram */
                 man->gpu_offset = rdev->mc.vram_start;
                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
-                             TTM_MEMTYPE_FLAG_NEEDS_IOREMAP |
                              TTM_MEMTYPE_FLAG_MAPPABLE;
                 man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
                 man->default_caching = TTM_PL_FLAG_WC;
@@ -437,10 +435,53 @@ static int radeon_bo_move(struct ttm_buffer_object *bo,
 memcpy:
                 r = ttm_bo_move_memcpy(bo, evict, no_wait_reserve, no_wait_gpu, new_mem);
         }
-
         return r;
 }
 
+static int radeon_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
+{
+        struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
+        struct radeon_device *rdev = radeon_get_rdev(bdev);
+
+        mem->bus.addr = NULL;
+        mem->bus.offset = 0;
+        mem->bus.size = mem->num_pages << PAGE_SHIFT;
+        mem->bus.base = 0;
+        mem->bus.is_iomem = false;
+        if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
+                return -EINVAL;
+        switch (mem->mem_type) {
+        case TTM_PL_SYSTEM:
+                /* system memory */
+                return 0;
+        case TTM_PL_TT:
+#if __OS_HAS_AGP
+                if (rdev->flags & RADEON_IS_AGP) {
+                        /* RADEON_IS_AGP is set only if AGP is active */
+                        mem->bus.offset = mem->mm_node->start << PAGE_SHIFT;
+                        mem->bus.base = rdev->mc.agp_base;
+                        mem->bus.is_iomem = true;
+                }
+#endif
+                break;
+        case TTM_PL_VRAM:
+                mem->bus.offset = mem->mm_node->start << PAGE_SHIFT;
+                /* check if it's visible */
+                if ((mem->bus.offset + mem->bus.size) > rdev->mc.visible_vram_size)
+                        return -EINVAL;
+                mem->bus.base = rdev->mc.aper_base;
+                mem->bus.is_iomem = true;
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static void radeon_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
+{
+}
+
 static int radeon_sync_obj_wait(void *sync_obj, void *sync_arg,
                                 bool lazy, bool interruptible)
 {
@@ -481,6 +522,8 @@ static struct ttm_bo_driver radeon_bo_driver = {
         .sync_obj_ref = &radeon_sync_obj_ref,
         .move_notify = &radeon_bo_move_notify,
         .fault_reserve_notify = &radeon_bo_fault_reserve_notify,
+        .io_mem_reserve = &radeon_ttm_io_mem_reserve,
+        .io_mem_free = &radeon_ttm_io_mem_free,
 };
 
 int radeon_ttm_init(struct radeon_device *rdev)