[PATCH 08/13] drm/vmwgfx: add support for new TTM fault callback V4

[Jerome Glisse <jglisse@redhat.com>]

This add the support for the new fault callback, does change anything
from driver point of view.

Improvement: store the aperture base in a variable so that we don't
call a function to get it on each fault.

Patch hasn't been tested.

V2 don't derefence bo->mem.mm_node as it's not NULL only for
   VRAM or GTT
V3 update after io_mem_reserve/io_mem_free callback balancing
V4 callback has to ioremap

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c |   49 ++++++++++++++++++++++++++++++--
 1 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
index 825ebe3..9d5a08d 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
@@ -153,8 +153,7 @@ int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 		man->gpu_offset = 0;
 		man->io_offset = dev_priv->vram_start;
 		man->io_size = dev_priv->vram_size;
-		man->flags = TTM_MEMTYPE_FLAG_FIXED |
-		    TTM_MEMTYPE_FLAG_NEEDS_IOREMAP | TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
 		man->io_addr = NULL;
 		man->available_caching = TTM_PL_MASK_CACHING;
 		man->default_caching = TTM_PL_FLAG_WC;
@@ -193,6 +192,47 @@ static void vmw_swap_notify(struct ttm_buffer_object *bo)
 	vmw_dmabuf_gmr_unbind(bo);
 }
 
+static int vmw_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 vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
+
+	mem->bus.addr = NULL;
+	mem->bus.is_iomem = false;
+	mem->bus.offset = 0;
+	mem->bus.size = mem->num_pages << PAGE_SHIFT;
+	mem->bus.base = 0;
+	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
+		return -EINVAL;
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+		/* System memory */
+		return 0;
+	case TTM_PL_VRAM:
+		mem->bus.offset = mem->mm_node->start << PAGE_SHIFT;
+		mem->bus.base = dev_priv->vram_start;
+		mem->bus.is_iomem = true;
+		mem->bus.addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
+		if (mem->bus.addr == NULL)
+			return -ENOMEM;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
+{
+	if (mem->bus.addr)
+		iounmap(mem->bus.addr);
+}
+
+static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
+{
+	return 0;
+}
+
 /**
  * FIXME: We're using the old vmware polling method to sync.
  * Do this with fences instead.
@@ -248,5 +288,8 @@ struct ttm_bo_driver vmw_bo_driver = {
 	.sync_obj_unref = vmw_sync_obj_unref,
 	.sync_obj_ref = vmw_sync_obj_ref,
 	.move_notify = vmw_move_notify,
-	.swap_notify = vmw_swap_notify
+	.swap_notify = vmw_swap_notify,
+	.fault_reserve_notify = &vmw_ttm_fault_reserve_notify,
+	.io_mem_reserve = &vmw_ttm_io_mem_reserve,
+	.io_mem_free = &vmw_ttm_io_mem_free,
 };
-- 
1.6.6.1


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