--- /dev/null
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * Authors:
+ * Dave Airlie
+ * Alon Levy
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 <ttm/ttm_bo_api.h>
+#include <ttm/ttm_bo_driver.h>
+#include <ttm/ttm_placement.h>
+#include <ttm/ttm_page_alloc.h>
+#include <ttm/ttm_module.h>
+#include <drm/drmP.h>
+#include <drm/drm.h>
+#include <drm/virtgpu_drm.h>
+#include "virtgpu_drv.h"
+
+#include <linux/delay.h>
+
+#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
+
+static struct
+virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
+{
+ struct virtio_gpu_mman *mman;
+ struct virtio_gpu_device *vgdev;
+
+ mman = container_of(bdev, struct virtio_gpu_mman, bdev);
+ vgdev = container_of(mman, struct virtio_gpu_device, mman);
+ return vgdev;
+}
+
+static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+ return ttm_mem_global_init(ref->object);
+}
+
+static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+ ttm_mem_global_release(ref->object);
+}
+
+static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
+{
+ struct drm_global_reference *global_ref;
+ int r;
+
+ vgdev->mman.mem_global_referenced = false;
+ global_ref = &vgdev->mman.mem_global_ref;
+ global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+ global_ref->size = sizeof(struct ttm_mem_global);
+ global_ref->init = &virtio_gpu_ttm_mem_global_init;
+ global_ref->release = &virtio_gpu_ttm_mem_global_release;
+
+ r = drm_global_item_ref(global_ref);
+ if (r != 0) {
+ DRM_ERROR("Failed setting up TTM memory accounting "
+ "subsystem.\n");
+ return r;
+ }
+
+ vgdev->mman.bo_global_ref.mem_glob =
+ vgdev->mman.mem_global_ref.object;
+ global_ref = &vgdev->mman.bo_global_ref.ref;
+ global_ref->global_type = DRM_GLOBAL_TTM_BO;
+ global_ref->size = sizeof(struct ttm_bo_global);
+ global_ref->init = &ttm_bo_global_init;
+ global_ref->release = &ttm_bo_global_release;
+ r = drm_global_item_ref(global_ref);
+ if (r != 0) {
+ DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+ drm_global_item_unref(&vgdev->mman.mem_global_ref);
+ return r;
+ }
+
+ vgdev->mman.mem_global_referenced = true;
+ return 0;
+}
+
+static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
+{
+ if (vgdev->mman.mem_global_referenced) {
+ drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
+ drm_global_item_unref(&vgdev->mman.mem_global_ref);
+ vgdev->mman.mem_global_referenced = false;
+ }
+}
+
+#if 0
+/*
+ * Hmm, seems to not do anything useful. Leftover debug hack?
+ * Something like printing pagefaults to kernel log?
+ */
+static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
+static const struct vm_operations_struct *ttm_vm_ops;
+
+static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
+ struct vm_fault *vmf)
+{
+ struct ttm_buffer_object *bo;
+ struct virtio_gpu_device *vgdev;
+ int r;
+
+ bo = (struct ttm_buffer_object *)vma->vm_private_data;
+ if (bo == NULL)
+ return VM_FAULT_NOPAGE;
+ vgdev = virtio_gpu_get_vgdev(bo->bdev);
+ r = ttm_vm_ops->fault(vma, vmf);
+ return r;
+}
+#endif
+
+int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct drm_file *file_priv;
+ struct virtio_gpu_device *vgdev;
+ int r;
+
+ file_priv = filp->private_data;
+ vgdev = file_priv->minor->dev->dev_private;
+ if (vgdev == NULL) {
+ DRM_ERROR(
+ "filp->private_data->minor->dev->dev_private == NULL\n");
+ return -EINVAL;
+ }
+ r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
+#if 0
+ if (unlikely(r != 0))
+ return r;
+ if (unlikely(ttm_vm_ops == NULL)) {
+ ttm_vm_ops = vma->vm_ops;
+ virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
+ virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
+ }
+ vma->vm_ops = &virtio_gpu_ttm_vm_ops;
+ return 0;
+#else
+ return r;
+#endif
+}
+
+static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
+ uint32_t flags)
+{
+ return 0;
+}
+
+static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
+ struct ttm_buffer_object *bo,
+ const struct ttm_place *place,
+ struct ttm_mem_reg *mem)
+{
+ mem->mm_node = (void *)1;
+ return 0;
+}
+
+static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
+ struct ttm_mem_reg *mem)
+{
+ mem->mm_node = (void *)NULL;
+ return;
+}
+
+static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
+ unsigned long p_size)
+{
+ return 0;
+}
+
+static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
+{
+ return 0;
+}
+
+static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
+ const char *prefix)
+{
+}
+
+static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
+ ttm_bo_man_init,
+ ttm_bo_man_takedown,
+ ttm_bo_man_get_node,
+ ttm_bo_man_put_node,
+ ttm_bo_man_debug
+};
+
+static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+ struct ttm_mem_type_manager *man)
+{
+ struct virtio_gpu_device *vgdev;
+
+ vgdev = virtio_gpu_get_vgdev(bdev);
+
+ switch (type) {
+ case TTM_PL_SYSTEM:
+ /* System memory */
+ man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+ man->available_caching = TTM_PL_MASK_CACHING;
+ man->default_caching = TTM_PL_FLAG_CACHED;
+ break;
+ case TTM_PL_TT:
+ man->func = &virtio_gpu_bo_manager_func;
+ man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+ man->available_caching = TTM_PL_MASK_CACHING;
+ man->default_caching = TTM_PL_FLAG_CACHED;
+ break;
+ default:
+ DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
+ struct ttm_placement *placement)
+{
+ static struct ttm_place placements = {
+ .fpfn = 0,
+ .lpfn = 0,
+ .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
+ };
+
+ placement->placement = &placements;
+ placement->busy_placement = &placements;
+ placement->num_placement = 1;
+ placement->num_busy_placement = 1;
+ return;
+}
+
+static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
+ struct file *filp)
+{
+ return 0;
+}
+
+static int virtio_gpu_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];
+
+ 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:
+ case TTM_PL_TT:
+ /* system memory */
+ return 0;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
+ struct ttm_mem_reg *mem)
+{
+}
+
+/*
+ * TTM backend functions.
+ */
+struct virtio_gpu_ttm_tt {
+ struct ttm_dma_tt ttm;
+ struct virtio_gpu_device *vgdev;
+ u64 offset;
+};
+
+static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
+ struct ttm_mem_reg *bo_mem)
+{
+ struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
+
+ gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
+ if (!ttm->num_pages)
+ WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
+ ttm->num_pages, bo_mem, ttm);
+
+ /* Not implemented */
+ return 0;
+}
+
+static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
+{
+ /* Not implemented */
+ return 0;
+}
+
+static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
+{
+ struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
+
+ ttm_dma_tt_fini(>t->ttm);
+ kfree(gtt);
+}
+
+static struct ttm_backend_func virtio_gpu_backend_func = {
+ .bind = &virtio_gpu_ttm_backend_bind,
+ .unbind = &virtio_gpu_ttm_backend_unbind,
+ .destroy = &virtio_gpu_ttm_backend_destroy,
+};
+
+static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
+{
+ if (ttm->state != tt_unpopulated)
+ return 0;
+
+ return ttm_pool_populate(ttm);
+}
+
+static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+ ttm_pool_unpopulate(ttm);
+}
+
+static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
+ unsigned long size,
+ uint32_t page_flags,
+ struct page *dummy_read_page)
+{
+ struct virtio_gpu_device *vgdev;
+ struct virtio_gpu_ttm_tt *gtt;
+
+ vgdev = virtio_gpu_get_vgdev(bdev);
+ gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
+ if (gtt == NULL)
+ return NULL;
+ gtt->ttm.ttm.func = &virtio_gpu_backend_func;
+ gtt->vgdev = vgdev;
+ if (ttm_dma_tt_init(>t->ttm, bdev, size, page_flags,
+ dummy_read_page)) {
+ kfree(gtt);
+ return NULL;
+ }
+ return >t->ttm.ttm;
+}
+
+static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
+ struct ttm_mem_reg *new_mem)
+{
+ struct ttm_mem_reg *old_mem = &bo->mem;
+
+ BUG_ON(old_mem->mm_node != NULL);
+ *old_mem = *new_mem;
+ new_mem->mm_node = NULL;
+}
+
+static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
+ bool evict, bool interruptible,
+ bool no_wait_gpu,
+ struct ttm_mem_reg *new_mem)
+{
+ virtio_gpu_move_null(bo, new_mem);
+ return 0;
+}
+
+static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
+ struct ttm_mem_reg *new_mem)
+{
+ struct virtio_gpu_object *bo;
+ struct virtio_gpu_device *vgdev;
+
+ bo = container_of(tbo, struct virtio_gpu_object, tbo);
+ vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
+
+ if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
+ if (bo->hw_res_handle)
+ virtio_gpu_cmd_resource_inval_backing(vgdev,
+ bo->hw_res_handle);
+
+ } else if (new_mem->placement & TTM_PL_FLAG_TT) {
+ if (bo->hw_res_handle) {
+ virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
+ NULL);
+ }
+ }
+}
+
+static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
+{
+ struct virtio_gpu_object *bo;
+ struct virtio_gpu_device *vgdev;
+
+ bo = container_of(tbo, struct virtio_gpu_object, tbo);
+ vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
+
+ if (bo->pages)
+ virtio_gpu_object_free_sg_table(bo);
+}
+
+static struct ttm_bo_driver virtio_gpu_bo_driver = {
+ .ttm_tt_create = &virtio_gpu_ttm_tt_create,
+ .ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
+ .ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
+ .invalidate_caches = &virtio_gpu_invalidate_caches,
+ .init_mem_type = &virtio_gpu_init_mem_type,
+ .evict_flags = &virtio_gpu_evict_flags,
+ .move = &virtio_gpu_bo_move,
+ .verify_access = &virtio_gpu_verify_access,
+ .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
+ .io_mem_free = &virtio_gpu_ttm_io_mem_free,
+ .move_notify = &virtio_gpu_bo_move_notify,
+ .swap_notify = &virtio_gpu_bo_swap_notify,
+};
+
+int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
+{
+ int r;
+
+ r = virtio_gpu_ttm_global_init(vgdev);
+ if (r)
+ return r;
+ /* No others user of address space so set it to 0 */
+ r = ttm_bo_device_init(&vgdev->mman.bdev,
+ vgdev->mman.bo_global_ref.ref.object,
+ &virtio_gpu_bo_driver,
+ vgdev->ddev->anon_inode->i_mapping,
+ DRM_FILE_PAGE_OFFSET, 0);
+ if (r) {
+ DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
+ goto err_dev_init;
+ }
+
+ r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
+ if (r) {
+ DRM_ERROR("Failed initializing GTT heap.\n");
+ goto err_mm_init;
+ }
+ return 0;
+
+err_mm_init:
+ ttm_bo_device_release(&vgdev->mman.bdev);
+err_dev_init:
+ virtio_gpu_ttm_global_fini(vgdev);
+ return r;
+}
+
+void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
+{
+ ttm_bo_device_release(&vgdev->mman.bdev);
+ virtio_gpu_ttm_global_fini(vgdev);
+ DRM_INFO("virtio_gpu: ttm finalized\n");
+}
Code Review / kvmfornfv.git / blobdiff