--- /dev/null
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "bochs.h"
+
+static void bochs_ttm_placement(struct bochs_bo *bo, int domain);
+
+/* ---------------------------------------------------------------------- */
+
+static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
+{
+ return container_of(bd, struct bochs_device, ttm.bdev);
+}
+
+static int bochs_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+ return ttm_mem_global_init(ref->object);
+}
+
+static void bochs_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+ ttm_mem_global_release(ref->object);
+}
+
+static int bochs_ttm_global_init(struct bochs_device *bochs)
+{
+ struct drm_global_reference *global_ref;
+ int r;
+
+ global_ref = &bochs->ttm.mem_global_ref;
+ global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+ global_ref->size = sizeof(struct ttm_mem_global);
+ global_ref->init = &bochs_ttm_mem_global_init;
+ global_ref->release = &bochs_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;
+ }
+
+ bochs->ttm.bo_global_ref.mem_glob =
+ bochs->ttm.mem_global_ref.object;
+ global_ref = &bochs->ttm.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(&bochs->ttm.mem_global_ref);
+ return r;
+ }
+
+ return 0;
+}
+
+static void bochs_ttm_global_release(struct bochs_device *bochs)
+{
+ if (bochs->ttm.mem_global_ref.release == NULL)
+ return;
+
+ drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
+ drm_global_item_unref(&bochs->ttm.mem_global_ref);
+ bochs->ttm.mem_global_ref.release = NULL;
+}
+
+
+static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
+{
+ struct bochs_bo *bo;
+
+ bo = container_of(tbo, struct bochs_bo, bo);
+ drm_gem_object_release(&bo->gem);
+ kfree(bo);
+}
+
+static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
+{
+ if (bo->destroy == &bochs_bo_ttm_destroy)
+ return true;
+ return false;
+}
+
+static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+ struct ttm_mem_type_manager *man)
+{
+ switch (type) {
+ case TTM_PL_SYSTEM:
+ man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+ man->available_caching = TTM_PL_MASK_CACHING;
+ man->default_caching = TTM_PL_FLAG_CACHED;
+ break;
+ case TTM_PL_VRAM:
+ man->func = &ttm_bo_manager_func;
+ man->flags = TTM_MEMTYPE_FLAG_FIXED |
+ TTM_MEMTYPE_FLAG_MAPPABLE;
+ man->available_caching = TTM_PL_FLAG_UNCACHED |
+ TTM_PL_FLAG_WC;
+ man->default_caching = TTM_PL_FLAG_WC;
+ break;
+ default:
+ DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void
+bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
+{
+ struct bochs_bo *bochsbo = bochs_bo(bo);
+
+ if (!bochs_ttm_bo_is_bochs_bo(bo))
+ return;
+
+ bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
+ *pl = bochsbo->placement;
+}
+
+static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
+ struct file *filp)
+{
+ struct bochs_bo *bochsbo = bochs_bo(bo);
+
+ return drm_vma_node_verify_access(&bochsbo->gem.vma_node, filp);
+}
+
+static int bochs_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 bochs_device *bochs = bochs_bdev(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_VRAM:
+ mem->bus.offset = mem->start << PAGE_SHIFT;
+ mem->bus.base = bochs->fb_base;
+ mem->bus.is_iomem = true;
+ break;
+ default:
+ return -EINVAL;
+ break;
+ }
+ return 0;
+}
+
+static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
+ struct ttm_mem_reg *mem)
+{
+}
+
+static int bochs_bo_move(struct ttm_buffer_object *bo,
+ bool evict, bool interruptible,
+ bool no_wait_gpu,
+ struct ttm_mem_reg *new_mem)
+{
+ return ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
+}
+
+
+static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
+{
+ ttm_tt_fini(tt);
+ kfree(tt);
+}
+
+static struct ttm_backend_func bochs_tt_backend_func = {
+ .destroy = &bochs_ttm_backend_destroy,
+};
+
+static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
+ unsigned long size,
+ uint32_t page_flags,
+ struct page *dummy_read_page)
+{
+ struct ttm_tt *tt;
+
+ tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
+ if (tt == NULL)
+ return NULL;
+ tt->func = &bochs_tt_backend_func;
+ if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+ kfree(tt);
+ return NULL;
+ }
+ return tt;
+}
+
+struct ttm_bo_driver bochs_bo_driver = {
+ .ttm_tt_create = bochs_ttm_tt_create,
+ .ttm_tt_populate = ttm_pool_populate,
+ .ttm_tt_unpopulate = ttm_pool_unpopulate,
+ .init_mem_type = bochs_bo_init_mem_type,
+ .evict_flags = bochs_bo_evict_flags,
+ .move = bochs_bo_move,
+ .verify_access = bochs_bo_verify_access,
+ .io_mem_reserve = &bochs_ttm_io_mem_reserve,
+ .io_mem_free = &bochs_ttm_io_mem_free,
+};
+
+int bochs_mm_init(struct bochs_device *bochs)
+{
+ struct ttm_bo_device *bdev = &bochs->ttm.bdev;
+ int ret;
+
+ ret = bochs_ttm_global_init(bochs);
+ if (ret)
+ return ret;
+
+ ret = ttm_bo_device_init(&bochs->ttm.bdev,
+ bochs->ttm.bo_global_ref.ref.object,
+ &bochs_bo_driver,
+ bochs->dev->anon_inode->i_mapping,
+ DRM_FILE_PAGE_OFFSET,
+ true);
+ if (ret) {
+ DRM_ERROR("Error initialising bo driver; %d\n", ret);
+ return ret;
+ }
+
+ ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
+ bochs->fb_size >> PAGE_SHIFT);
+ if (ret) {
+ DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
+ return ret;
+ }
+
+ bochs->ttm.initialized = true;
+ return 0;
+}
+
+void bochs_mm_fini(struct bochs_device *bochs)
+{
+ if (!bochs->ttm.initialized)
+ return;
+
+ ttm_bo_device_release(&bochs->ttm.bdev);
+ bochs_ttm_global_release(bochs);
+ bochs->ttm.initialized = false;
+}
+
+static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
+{
+ unsigned i;
+ u32 c = 0;
+ bo->placement.placement = bo->placements;
+ bo->placement.busy_placement = bo->placements;
+ if (domain & TTM_PL_FLAG_VRAM) {
+ bo->placements[c++].flags = TTM_PL_FLAG_WC
+ | TTM_PL_FLAG_UNCACHED
+ | TTM_PL_FLAG_VRAM;
+ }
+ if (domain & TTM_PL_FLAG_SYSTEM) {
+ bo->placements[c++].flags = TTM_PL_MASK_CACHING
+ | TTM_PL_FLAG_SYSTEM;
+ }
+ if (!c) {
+ bo->placements[c++].flags = TTM_PL_MASK_CACHING
+ | TTM_PL_FLAG_SYSTEM;
+ }
+ for (i = 0; i < c; ++i) {
+ bo->placements[i].fpfn = 0;
+ bo->placements[i].lpfn = 0;
+ }
+ bo->placement.num_placement = c;
+ bo->placement.num_busy_placement = c;
+}
+
+static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
+{
+ return bo->bo.offset;
+}
+
+int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
+{
+ int i, ret;
+
+ if (bo->pin_count) {
+ bo->pin_count++;
+ if (gpu_addr)
+ *gpu_addr = bochs_bo_gpu_offset(bo);
+ return 0;
+ }
+
+ bochs_ttm_placement(bo, pl_flag);
+ for (i = 0; i < bo->placement.num_placement; i++)
+ bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
+ ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+ if (ret)
+ return ret;
+
+ bo->pin_count = 1;
+ if (gpu_addr)
+ *gpu_addr = bochs_bo_gpu_offset(bo);
+ return 0;
+}
+
+int bochs_bo_unpin(struct bochs_bo *bo)
+{
+ int i, ret;
+
+ if (!bo->pin_count) {
+ DRM_ERROR("unpin bad %p\n", bo);
+ return 0;
+ }
+ bo->pin_count--;
+
+ if (bo->pin_count)
+ return 0;
+
+ for (i = 0; i < bo->placement.num_placement; i++)
+ bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
+ ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct drm_file *file_priv;
+ struct bochs_device *bochs;
+
+ if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+ return -EINVAL;
+
+ file_priv = filp->private_data;
+ bochs = file_priv->minor->dev->dev_private;
+ return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int bochs_bo_create(struct drm_device *dev, int size, int align,
+ uint32_t flags, struct bochs_bo **pbochsbo)
+{
+ struct bochs_device *bochs = dev->dev_private;
+ struct bochs_bo *bochsbo;
+ size_t acc_size;
+ int ret;
+
+ bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
+ if (!bochsbo)
+ return -ENOMEM;
+
+ ret = drm_gem_object_init(dev, &bochsbo->gem, size);
+ if (ret) {
+ kfree(bochsbo);
+ return ret;
+ }
+
+ bochsbo->bo.bdev = &bochs->ttm.bdev;
+ bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
+
+ bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
+
+ acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
+ sizeof(struct bochs_bo));
+
+ ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
+ ttm_bo_type_device, &bochsbo->placement,
+ align >> PAGE_SHIFT, false, NULL, acc_size,
+ NULL, NULL, bochs_bo_ttm_destroy);
+ if (ret)
+ return ret;
+
+ *pbochsbo = bochsbo;
+ return 0;
+}
+
+int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
+ struct drm_gem_object **obj)
+{
+ struct bochs_bo *bochsbo;
+ int ret;
+
+ *obj = NULL;
+
+ size = PAGE_ALIGN(size);
+ if (size == 0)
+ return -EINVAL;
+
+ ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
+ if (ret) {
+ if (ret != -ERESTARTSYS)
+ DRM_ERROR("failed to allocate GEM object\n");
+ return ret;
+ }
+ *obj = &bochsbo->gem;
+ return 0;
+}
+
+int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct drm_gem_object *gobj;
+ u32 handle;
+ int ret;
+
+ args->pitch = args->width * ((args->bpp + 7) / 8);
+ args->size = args->pitch * args->height;
+
+ ret = bochs_gem_create(dev, args->size, false,
+ &gobj);
+ if (ret)
+ return ret;
+
+ ret = drm_gem_handle_create(file, gobj, &handle);
+ drm_gem_object_unreference_unlocked(gobj);
+ if (ret)
+ return ret;
+
+ args->handle = handle;
+ return 0;
+}
+
+static void bochs_bo_unref(struct bochs_bo **bo)
+{
+ struct ttm_buffer_object *tbo;
+
+ if ((*bo) == NULL)
+ return;
+
+ tbo = &((*bo)->bo);
+ ttm_bo_unref(&tbo);
+ *bo = NULL;
+}
+
+void bochs_gem_free_object(struct drm_gem_object *obj)
+{
+ struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
+
+ bochs_bo_unref(&bochs_bo);
+}
+
+int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
+ uint32_t handle, uint64_t *offset)
+{
+ struct drm_gem_object *obj;
+ int ret;
+ struct bochs_bo *bo;
+
+ mutex_lock(&dev->struct_mutex);
+ obj = drm_gem_object_lookup(dev, file, handle);
+ if (obj == NULL) {
+ ret = -ENOENT;
+ goto out_unlock;
+ }
+
+ bo = gem_to_bochs_bo(obj);
+ *offset = bochs_bo_mmap_offset(bo);
+
+ drm_gem_object_unreference(obj);
+ ret = 0;
+out_unlock:
+ mutex_unlock(&dev->struct_mutex);
+ return ret;
+
+}
+
+/* ---------------------------------------------------------------------- */
+
+static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
+{
+ struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
+ if (bochs_fb->obj)
+ drm_gem_object_unreference_unlocked(bochs_fb->obj);
+ drm_framebuffer_cleanup(fb);
+ kfree(fb);
+}
+
+static const struct drm_framebuffer_funcs bochs_fb_funcs = {
+ .destroy = bochs_user_framebuffer_destroy,
+};
+
+int bochs_framebuffer_init(struct drm_device *dev,
+ struct bochs_framebuffer *gfb,
+ struct drm_mode_fb_cmd2 *mode_cmd,
+ struct drm_gem_object *obj)
+{
+ int ret;
+
+ drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
+ gfb->obj = obj;
+ ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
+ if (ret) {
+ DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
+ return ret;
+ }
+ return 0;
+}
+
+static struct drm_framebuffer *
+bochs_user_framebuffer_create(struct drm_device *dev,
+ struct drm_file *filp,
+ struct drm_mode_fb_cmd2 *mode_cmd)
+{
+ struct drm_gem_object *obj;
+ struct bochs_framebuffer *bochs_fb;
+ int ret;
+
+ DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
+ mode_cmd->width, mode_cmd->height,
+ (mode_cmd->pixel_format) & 0xff,
+ (mode_cmd->pixel_format >> 8) & 0xff,
+ (mode_cmd->pixel_format >> 16) & 0xff,
+ (mode_cmd->pixel_format >> 24) & 0xff);
+
+ if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
+ return ERR_PTR(-ENOENT);
+
+ obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
+ if (obj == NULL)
+ return ERR_PTR(-ENOENT);
+
+ bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
+ if (!bochs_fb) {
+ drm_gem_object_unreference_unlocked(obj);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
+ if (ret) {
+ drm_gem_object_unreference_unlocked(obj);
+ kfree(bochs_fb);
+ return ERR_PTR(ret);
+ }
+ return &bochs_fb->base;
+}
+
+const struct drm_mode_config_funcs bochs_mode_funcs = {
+ .fb_create = bochs_user_framebuffer_create,
+};
Code Review / kvmfornfv.git / blobdiff