drm/vmwgfx: Replace vmw_dma_buffer with vmw_buffer_object

Initially vmware buffer objects were only used as DMA buffers, so the name
DMA buffer was a natural one. However, currently they are used also as
dumb buffers and MOBs backing guest backed objects so renaming them to
buffer objects is logical. Particularly since there is a dmabuf subsystem
in the kernel where a dma buffer means something completely different.

This also renames user-space api structures and IOCTL names
correspondingly, but the old names remain defined for now and the ABI
hasn't changed.

There are a couple of minor style changes to make checkpatch happy.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>

1 files changed, 887 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
new file mode 100644
index 000000000000..0931f43913b1
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_buffer.c
@@ -0,0 +1,887 @@
+/**************************************************************************
+ *
+ * Copyright © 2009-2015 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "vmwgfx_drv.h"
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_placement.h>
+#include <drm/ttm/ttm_page_alloc.h>
+
+static const struct ttm_place vram_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
+};
+
+static const struct ttm_place vram_ne_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
+};
+
+static const struct ttm_place sys_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
+};
+
+static const struct ttm_place sys_ne_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
+};
+
+static const struct ttm_place gmr_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
+};
+
+static const struct ttm_place gmr_ne_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
+};
+
+static const struct ttm_place mob_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
+};
+
+static const struct ttm_place mob_ne_placement_flags = {
+        .fpfn = 0,
+        .lpfn = 0,
+        .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT
+};
+
+struct ttm_placement vmw_vram_placement = {
+        .num_placement = 1,
+        .placement = &vram_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &vram_placement_flags
+};
+
+static const struct ttm_place vram_gmr_placement_flags[] = {
+        {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
+        }
+};
+
+static const struct ttm_place gmr_vram_placement_flags[] = {
+        {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
+        }
+};
+
+struct ttm_placement vmw_vram_gmr_placement = {
+        .num_placement = 2,
+        .placement = vram_gmr_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &gmr_placement_flags
+};
+
+static const struct ttm_place vram_gmr_ne_placement_flags[] = {
+        {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED |
+                         TTM_PL_FLAG_NO_EVICT
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED |
+                         TTM_PL_FLAG_NO_EVICT
+        }
+};
+
+struct ttm_placement vmw_vram_gmr_ne_placement = {
+        .num_placement = 2,
+        .placement = vram_gmr_ne_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &gmr_ne_placement_flags
+};
+
+struct ttm_placement vmw_vram_sys_placement = {
+        .num_placement = 1,
+        .placement = &vram_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &sys_placement_flags
+};
+
+struct ttm_placement vmw_vram_ne_placement = {
+        .num_placement = 1,
+        .placement = &vram_ne_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &vram_ne_placement_flags
+};
+
+struct ttm_placement vmw_sys_placement = {
+        .num_placement = 1,
+        .placement = &sys_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &sys_placement_flags
+};
+
+struct ttm_placement vmw_sys_ne_placement = {
+        .num_placement = 1,
+        .placement = &sys_ne_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &sys_ne_placement_flags
+};
+
+static const struct ttm_place evictable_placement_flags[] = {
+        {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
+        }
+};
+
+static const struct ttm_place nonfixed_placement_flags[] = {
+        {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED
+        }, {
+                .fpfn = 0,
+                .lpfn = 0,
+                .flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED
+        }
+};
+
+struct ttm_placement vmw_evictable_placement = {
+        .num_placement = 4,
+        .placement = evictable_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &sys_placement_flags
+};
+
+struct ttm_placement vmw_srf_placement = {
+        .num_placement = 1,
+        .num_busy_placement = 2,
+        .placement = &gmr_placement_flags,
+        .busy_placement = gmr_vram_placement_flags
+};
+
+struct ttm_placement vmw_mob_placement = {
+        .num_placement = 1,
+        .num_busy_placement = 1,
+        .placement = &mob_placement_flags,
+        .busy_placement = &mob_placement_flags
+};
+
+struct ttm_placement vmw_mob_ne_placement = {
+        .num_placement = 1,
+        .num_busy_placement = 1,
+        .placement = &mob_ne_placement_flags,
+        .busy_placement = &mob_ne_placement_flags
+};
+
+struct ttm_placement vmw_nonfixed_placement = {
+        .num_placement = 3,
+        .placement = nonfixed_placement_flags,
+        .num_busy_placement = 1,
+        .busy_placement = &sys_placement_flags
+};
+
+struct vmw_ttm_tt {
+        struct ttm_dma_tt dma_ttm;
+        struct vmw_private *dev_priv;
+        int gmr_id;
+        struct vmw_mob *mob;
+        int mem_type;
+        struct sg_table sgt;
+        struct vmw_sg_table vsgt;
+        uint64_t sg_alloc_size;
+        bool mapped;
+};
+
+const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);
+
+/**
+ * Helper functions to advance a struct vmw_piter iterator.
+ *
+ * @viter: Pointer to the iterator.
+ *
+ * These functions return false if past the end of the list,
+ * true otherwise. Functions are selected depending on the current
+ * DMA mapping mode.
+ */
+static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)
+{
+        return ++(viter->i) < viter->num_pages;
+}
+
+static bool __vmw_piter_sg_next(struct vmw_piter *viter)
+{
+        return __sg_page_iter_next(&viter->iter);
+}
+
+
+/**
+ * Helper functions to return a pointer to the current page.
+ *
+ * @viter: Pointer to the iterator
+ *
+ * These functions return a pointer to the page currently
+ * pointed to by @viter. Functions are selected depending on the
+ * current mapping mode.
+ */
+static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)
+{
+        return viter->pages[viter->i];
+}
+
+static struct page *__vmw_piter_sg_page(struct vmw_piter *viter)
+{
+        return sg_page_iter_page(&viter->iter);
+}
+
+
+/**
+ * Helper functions to return the DMA address of the current page.
+ *
+ * @viter: Pointer to the iterator
+ *
+ * These functions return the DMA address of the page currently
+ * pointed to by @viter. Functions are selected depending on the
+ * current mapping mode.
+ */
+static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)
+{
+        return page_to_phys(viter->pages[viter->i]);
+}
+
+static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)
+{
+        return viter->addrs[viter->i];
+}
+
+static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)
+{
+        return sg_page_iter_dma_address(&viter->iter);
+}
+
+
+/**
+ * vmw_piter_start - Initialize a struct vmw_piter.
+ *
+ * @viter: Pointer to the iterator to initialize
+ * @vsgt: Pointer to a struct vmw_sg_table to initialize from
+ *
+ * Note that we're following the convention of __sg_page_iter_start, so that
+ * the iterator doesn't point to a valid page after initialization; it has
+ * to be advanced one step first.
+ */
+void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,
+                     unsigned long p_offset)
+{
+        viter->i = p_offset - 1;
+        viter->num_pages = vsgt->num_pages;
+        switch (vsgt->mode) {
+        case vmw_dma_phys:
+                viter->next = &__vmw_piter_non_sg_next;
+                viter->dma_address = &__vmw_piter_phys_addr;
+                viter->page = &__vmw_piter_non_sg_page;
+                viter->pages = vsgt->pages;
+                break;
+        case vmw_dma_alloc_coherent:
+                viter->next = &__vmw_piter_non_sg_next;
+                viter->dma_address = &__vmw_piter_dma_addr;
+                viter->page = &__vmw_piter_non_sg_page;
+                viter->addrs = vsgt->addrs;
+                viter->pages = vsgt->pages;
+                break;
+        case vmw_dma_map_populate:
+        case vmw_dma_map_bind:
+                viter->next = &__vmw_piter_sg_next;
+                viter->dma_address = &__vmw_piter_sg_addr;
+                viter->page = &__vmw_piter_sg_page;
+                __sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,
+                                     vsgt->sgt->orig_nents, p_offset);
+                break;
+        default:
+                BUG();
+        }
+}
+
+/**
+ * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for
+ * TTM pages
+ *
+ * @vmw_tt: Pointer to a struct vmw_ttm_backend
+ *
+ * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.
+ */
+static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)
+{
+        struct device *dev = vmw_tt->dev_priv->dev->dev;
+
+        dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,
+                DMA_BIDIRECTIONAL);
+        vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;
+}
+
+/**
+ * vmw_ttm_map_for_dma - map TTM pages to get device addresses
+ *
+ * @vmw_tt: Pointer to a struct vmw_ttm_backend
+ *
+ * This function is used to get device addresses from the kernel DMA layer.
+ * However, it's violating the DMA API in that when this operation has been
+ * performed, it's illegal for the CPU to write to the pages without first
+ * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is
+ * therefore only legal to call this function if we know that the function
+ * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most
+ * a CPU write buffer flush.
+ */
+static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)
+{
+        struct device *dev = vmw_tt->dev_priv->dev->dev;
+        int ret;
+
+        ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,
+                         DMA_BIDIRECTIONAL);
+        if (unlikely(ret == 0))
+                return -ENOMEM;
+
+        vmw_tt->sgt.nents = ret;
+
+        return 0;
+}
+
+/**
+ * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
+ *
+ * @vmw_tt: Pointer to a struct vmw_ttm_tt
+ *
+ * Select the correct function for and make sure the TTM pages are
+ * visible to the device. Allocate storage for the device mappings.
+ * If a mapping has already been performed, indicated by the storage
+ * pointer being non NULL, the function returns success.
+ */
+static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
+{
+        struct vmw_private *dev_priv = vmw_tt->dev_priv;
+        struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
+        struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
+        struct ttm_operation_ctx ctx = {
+                .interruptible = true,
+                .no_wait_gpu = false
+        };
+        struct vmw_piter iter;
+        dma_addr_t old;
+        int ret = 0;
+        static size_t sgl_size;
+        static size_t sgt_size;
+
+        if (vmw_tt->mapped)
+                return 0;
+
+        vsgt->mode = dev_priv->map_mode;
+        vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
+        vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
+        vsgt->addrs = vmw_tt->dma_ttm.dma_address;
+        vsgt->sgt = &vmw_tt->sgt;
+
+        switch (dev_priv->map_mode) {
+        case vmw_dma_map_bind:
+        case vmw_dma_map_populate:
+                if (unlikely(!sgl_size)) {
+                        sgl_size = ttm_round_pot(sizeof(struct scatterlist));
+                        sgt_size = ttm_round_pot(sizeof(struct sg_table));
+                }
+                vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
+                ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
+                if (unlikely(ret != 0))
+                        return ret;
+
+                ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
+                                                vsgt->num_pages, 0,
+                                                (unsigned long)
+                                                vsgt->num_pages << PAGE_SHIFT,
+                                                GFP_KERNEL);
+                if (unlikely(ret != 0))
+                        goto out_sg_alloc_fail;
+
+                if (vsgt->num_pages > vmw_tt->sgt.nents) {
+                        uint64_t over_alloc =
+                                sgl_size * (vsgt->num_pages -
+                                            vmw_tt->sgt.nents);
+
+                        ttm_mem_global_free(glob, over_alloc);
+                        vmw_tt->sg_alloc_size -= over_alloc;
+                }
+
+                ret = vmw_ttm_map_for_dma(vmw_tt);
+                if (unlikely(ret != 0))
+                        goto out_map_fail;
+
+                break;
+        default:
+                break;
+        }
+
+        old = ~((dma_addr_t) 0);
+        vmw_tt->vsgt.num_regions = 0;
+        for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
+                dma_addr_t cur = vmw_piter_dma_addr(&iter);
+
+                if (cur != old + PAGE_SIZE)
+                        vmw_tt->vsgt.num_regions++;
+                old = cur;
+        }
+
+        vmw_tt->mapped = true;
+        return 0;
+
+out_map_fail:
+        sg_free_table(vmw_tt->vsgt.sgt);
+        vmw_tt->vsgt.sgt = NULL;
+out_sg_alloc_fail:
+        ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
+        return ret;
+}
+
+/**
+ * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
+ *
+ * @vmw_tt: Pointer to a struct vmw_ttm_tt
+ *
+ * Tear down any previously set up device DMA mappings and free
+ * any storage space allocated for them. If there are no mappings set up,
+ * this function is a NOP.
+ */
+static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
+{
+        struct vmw_private *dev_priv = vmw_tt->dev_priv;
+
+        if (!vmw_tt->vsgt.sgt)
+                return;
+
+        switch (dev_priv->map_mode) {
+        case vmw_dma_map_bind:
+        case vmw_dma_map_populate:
+                vmw_ttm_unmap_from_dma(vmw_tt);
+                sg_free_table(vmw_tt->vsgt.sgt);
+                vmw_tt->vsgt.sgt = NULL;
+                ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                                    vmw_tt->sg_alloc_size);
+                break;
+        default:
+                break;
+        }
+        vmw_tt->mapped = false;
+}
+
+
+/**
+ * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
+ *
+ * @bo: Pointer to a struct ttm_buffer_object
+ *
+ * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
+ * instead of a pointer to a struct vmw_ttm_backend as argument.
+ * Note that the buffer object must be either pinned or reserved before
+ * calling this function.
+ */
+int vmw_bo_map_dma(struct ttm_buffer_object *bo)
+{
+        struct vmw_ttm_tt *vmw_tt =
+                container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+
+        return vmw_ttm_map_dma(vmw_tt);
+}
+
+
+/**
+ * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
+ *
+ * @bo: Pointer to a struct ttm_buffer_object
+ *
+ * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
+ * instead of a pointer to a struct vmw_ttm_backend as argument.
+ */
+void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
+{
+        struct vmw_ttm_tt *vmw_tt =
+                container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+
+        vmw_ttm_unmap_dma(vmw_tt);
+}
+
+
+/**
+ * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
+ * TTM buffer object
+ *
+ * @bo: Pointer to a struct ttm_buffer_object
+ *
+ * Returns a pointer to a struct vmw_sg_table object. The object should
+ * not be freed after use.
+ * Note that for the device addresses to be valid, the buffer object must
+ * either be reserved or pinned.
+ */
+const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
+{
+        struct vmw_ttm_tt *vmw_tt =
+                container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+
+        return &vmw_tt->vsgt;
+}
+
+
+static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
+{
+        struct vmw_ttm_tt *vmw_be =
+                container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+        int ret;
+
+        ret = vmw_ttm_map_dma(vmw_be);
+        if (unlikely(ret != 0))
+                return ret;
+
+        vmw_be->gmr_id = bo_mem->start;
+        vmw_be->mem_type = bo_mem->mem_type;
+
+        switch (bo_mem->mem_type) {
+        case VMW_PL_GMR:
+                return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
+                                    ttm->num_pages, vmw_be->gmr_id);
+        case VMW_PL_MOB:
+                if (unlikely(vmw_be->mob == NULL)) {
+                        vmw_be->mob =
+                                vmw_mob_create(ttm->num_pages);
+                        if (unlikely(vmw_be->mob == NULL))
+                                return -ENOMEM;
+                }
+
+                return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
+                                    &vmw_be->vsgt, ttm->num_pages,
+                                    vmw_be->gmr_id);
+        default:
+                BUG();
+        }
+        return 0;
+}
+
+static int vmw_ttm_unbind(struct ttm_tt *ttm)
+{
+        struct vmw_ttm_tt *vmw_be =
+                container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+
+        switch (vmw_be->mem_type) {
+        case VMW_PL_GMR:
+                vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
+                break;
+        case VMW_PL_MOB:
+                vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
+                break;
+        default:
+                BUG();
+        }
+
+        if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
+                vmw_ttm_unmap_dma(vmw_be);
+
+        return 0;
+}
+
+
+static void vmw_ttm_destroy(struct ttm_tt *ttm)
+{
+        struct vmw_ttm_tt *vmw_be =
+                container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+
+        vmw_ttm_unmap_dma(vmw_be);
+        if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
+                ttm_dma_tt_fini(&vmw_be->dma_ttm);
+        else
+                ttm_tt_fini(ttm);
+
+        if (vmw_be->mob)
+                vmw_mob_destroy(vmw_be->mob);
+
+        kfree(vmw_be);
+}
+
+
+static int vmw_ttm_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
+{
+        struct vmw_ttm_tt *vmw_tt =
+                container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
+        struct vmw_private *dev_priv = vmw_tt->dev_priv;
+        struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
+        int ret;
+
+        if (ttm->state != tt_unpopulated)
+                return 0;
+
+        if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
+                size_t size =
+                        ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
+                ret = ttm_mem_global_alloc(glob, size, ctx);
+                if (unlikely(ret != 0))
+                        return ret;
+
+                ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev,
+                                        ctx);
+                if (unlikely(ret != 0))
+                        ttm_mem_global_free(glob, size);
+        } else
+                ret = ttm_pool_populate(ttm, ctx);
+
+        return ret;
+}
+
+static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
+{
+        struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
+                                                 dma_ttm.ttm);
+        struct vmw_private *dev_priv = vmw_tt->dev_priv;
+        struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
+
+
+        if (vmw_tt->mob) {
+                vmw_mob_destroy(vmw_tt->mob);
+                vmw_tt->mob = NULL;
+        }
+
+        vmw_ttm_unmap_dma(vmw_tt);
+        if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
+                size_t size =
+                        ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
+
+                ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
+                ttm_mem_global_free(glob, size);
+        } else
+                ttm_pool_unpopulate(ttm);
+}
+
+static struct ttm_backend_func vmw_ttm_func = {
+        .bind = vmw_ttm_bind,
+        .unbind = vmw_ttm_unbind,
+        .destroy = vmw_ttm_destroy,
+};
+
+static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
+                                        uint32_t page_flags)
+{
+        struct vmw_ttm_tt *vmw_be;
+        int ret;
+
+        vmw_be = kzalloc(sizeof(*vmw_be), GFP_KERNEL);
+        if (!vmw_be)
+                return NULL;
+
+        vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
+        vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
+        vmw_be->mob = NULL;
+
+        if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
+                ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags);
+        else
+                ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags);
+        if (unlikely(ret != 0))
+                goto out_no_init;
+
+        return &vmw_be->dma_ttm.ttm;
+out_no_init:
+        kfree(vmw_be);
+        return NULL;
+}
+
+static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
+{
+        return 0;
+}
+
+static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+                      struct ttm_mem_type_manager *man)
+{
+        switch (type) {
+        case TTM_PL_SYSTEM:
+                /* System memory */
+
+                man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+                man->available_caching = TTM_PL_FLAG_CACHED;
+                man->default_caching = TTM_PL_FLAG_CACHED;
+                break;
+        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;
+                break;
+        case VMW_PL_GMR:
+        case VMW_PL_MOB:
+                /*
+                 * "Guest Memory Regions" is an aperture like feature with
+                 *  one slot per bo. There is an upper limit of the number of
+                 *  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;
+                break;
+        default:
+                DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static void vmw_evict_flags(struct ttm_buffer_object *bo,
+                     struct ttm_placement *placement)
+{
+        *placement = vmw_sys_placement;
+}
+
+static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
+{
+        struct ttm_object_file *tfile =
+                vmw_fpriv((struct drm_file *)filp->private_data)->tfile;
+
+        return vmw_user_bo_verify_access(bo, tfile);
+}
+
+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:
+        case VMW_PL_GMR:
+        case VMW_PL_MOB:
+                return 0;
+        case TTM_PL_VRAM:
+                mem->bus.offset = mem->start << PAGE_SHIFT;
+                mem->bus.base = dev_priv->vram_start;
+                mem->bus.is_iomem = true;
+                break;
+        default:
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static void vmw_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
+{
+}
+
+static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
+{
+        return 0;
+}
+
+/**
+ * vmw_move_notify - TTM move_notify_callback
+ *
+ * @bo: The TTM buffer object about to move.
+ * @mem: The struct ttm_mem_reg indicating to what memory
+ *       region the move is taking place.
+ *
+ * Calls move_notify for all subsystems needing it.
+ * (currently only resources).
+ */
+static void vmw_move_notify(struct ttm_buffer_object *bo,
+                            bool evict,
+                            struct ttm_mem_reg *mem)
+{
+        vmw_resource_move_notify(bo, mem);
+        vmw_query_move_notify(bo, mem);
+}
+
+
+/**
+ * vmw_swap_notify - TTM move_notify_callback
+ *
+ * @bo: The TTM buffer object about to be swapped out.
+ */
+static void vmw_swap_notify(struct ttm_buffer_object *bo)
+{
+        vmw_resource_swap_notify(bo);
+        (void) ttm_bo_wait(bo, false, false);
+}
+
+
+struct ttm_bo_driver vmw_bo_driver = {
+        .ttm_tt_create = &vmw_ttm_tt_create,
+        .ttm_tt_populate = &vmw_ttm_populate,
+        .ttm_tt_unpopulate = &vmw_ttm_unpopulate,
+        .invalidate_caches = vmw_invalidate_caches,
+        .init_mem_type = vmw_init_mem_type,
+        .eviction_valuable = ttm_bo_eviction_valuable,
+        .evict_flags = vmw_evict_flags,
+        .move = NULL,
+        .verify_access = vmw_verify_access,
+        .move_notify = vmw_move_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,
+};