From d5bde956630b86462ee22055f5816a04290aed57 Mon Sep 17 00:00:00 2001 From: Thomas Hellstrom Date: Fri, 31 Jan 2014 10:12:10 +0100 Subject: drm/vmwgfx: Emulate legacy shaders on guest-backed devices v2 Command stream legacy shader creation and destruction is replaced by NOPs in the command stream, and instead guest-backed shaders are created and destroyed as part of the command validation process. v2: Removed some stray debug messages. Signed-off-by: Thomas Hellstrom Reviewed-by: Jakob Bornecrantz --- drivers/gpu/drm/vmwgfx/vmwgfx_shader.c | 465 +++++++++++++++++++++++++++++---- 1 file changed, 417 insertions(+), 48 deletions(-) (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_shader.c') diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c index 1457ec4b7125..be85d7fdfb5b 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c @@ -29,6 +29,8 @@ #include "vmwgfx_resource_priv.h" #include "ttm/ttm_placement.h" +#define VMW_COMPAT_SHADER_HT_ORDER 12 + struct vmw_shader { struct vmw_resource res; SVGA3dShaderType type; @@ -40,6 +42,50 @@ struct vmw_user_shader { struct vmw_shader shader; }; +/** + * enum vmw_compat_shader_state - Staging state for compat shaders + */ +enum vmw_compat_shader_state { + VMW_COMPAT_COMMITED, + VMW_COMPAT_ADD, + VMW_COMPAT_DEL +}; + +/** + * struct vmw_compat_shader - Metadata for compat shaders. + * + * @handle: The TTM handle of the guest backed shader. + * @tfile: The struct ttm_object_file the guest backed shader is registered + * with. + * @hash: Hash item for lookup. + * @head: List head for staging lists or the compat shader manager list. + * @state: Staging state. + * + * The structure is protected by the cmdbuf lock. + */ +struct vmw_compat_shader { + u32 handle; + struct ttm_object_file *tfile; + struct drm_hash_item hash; + struct list_head head; + enum vmw_compat_shader_state state; +}; + +/** + * struct vmw_compat_shader_manager - Compat shader manager. + * + * @shaders: Hash table containing staged and commited compat shaders + * @list: List of commited shaders. + * @dev_priv: Pointer to a device private structure. + * + * @shaders and @list are protected by the cmdbuf mutex for now. + */ +struct vmw_compat_shader_manager { + struct drm_open_hash shaders; + struct list_head list; + struct vmw_private *dev_priv; +}; + static void vmw_user_shader_free(struct vmw_resource *res); static struct vmw_resource * vmw_user_shader_base_to_res(struct ttm_base_object *base); @@ -325,13 +371,81 @@ int vmw_shader_destroy_ioctl(struct drm_device *dev, void *data, TTM_REF_USAGE); } +int vmw_shader_alloc(struct vmw_private *dev_priv, + struct vmw_dma_buffer *buffer, + size_t shader_size, + size_t offset, + SVGA3dShaderType shader_type, + struct ttm_object_file *tfile, + u32 *handle) +{ + struct vmw_user_shader *ushader; + struct vmw_resource *res, *tmp; + int ret; + + /* + * Approximate idr memory usage with 128 bytes. It will be limited + * by maximum number_of shaders anyway. + */ + if (unlikely(vmw_user_shader_size == 0)) + vmw_user_shader_size = + ttm_round_pot(sizeof(struct vmw_user_shader)) + 128; + + ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), + vmw_user_shader_size, + false, true); + if (unlikely(ret != 0)) { + if (ret != -ERESTARTSYS) + DRM_ERROR("Out of graphics memory for shader " + "creation.\n"); + goto out; + } + + ushader = kzalloc(sizeof(*ushader), GFP_KERNEL); + if (unlikely(ushader == NULL)) { + ttm_mem_global_free(vmw_mem_glob(dev_priv), + vmw_user_shader_size); + ret = -ENOMEM; + goto out; + } + + res = &ushader->shader.res; + ushader->base.shareable = false; + ushader->base.tfile = NULL; + + /* + * From here on, the destructor takes over resource freeing. + */ + + ret = vmw_gb_shader_init(dev_priv, res, shader_size, + offset, shader_type, buffer, + vmw_user_shader_free); + if (unlikely(ret != 0)) + goto out; + + tmp = vmw_resource_reference(res); + ret = ttm_base_object_init(tfile, &ushader->base, false, + VMW_RES_SHADER, + &vmw_user_shader_base_release, NULL); + + if (unlikely(ret != 0)) { + vmw_resource_unreference(&tmp); + goto out_err; + } + + if (handle) + *handle = ushader->base.hash.key; +out_err: + vmw_resource_unreference(&res); +out: + return ret; +} + + int vmw_shader_define_ioctl(struct drm_device *dev, void *data, struct drm_file *file_priv) { struct vmw_private *dev_priv = vmw_priv(dev); - struct vmw_user_shader *ushader; - struct vmw_resource *res; - struct vmw_resource *tmp; struct drm_vmw_shader_create_arg *arg = (struct drm_vmw_shader_create_arg *)data; struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile; @@ -373,69 +487,324 @@ int vmw_shader_define_ioctl(struct drm_device *dev, void *data, goto out_bad_arg; } - /* - * Approximate idr memory usage with 128 bytes. It will be limited - * by maximum number_of shaders anyway. - */ + ret = ttm_read_lock(&vmaster->lock, true); + if (unlikely(ret != 0)) + goto out_bad_arg; - if (unlikely(vmw_user_shader_size == 0)) - vmw_user_shader_size = ttm_round_pot(sizeof(*ushader)) - + 128; + ret = vmw_shader_alloc(dev_priv, buffer, arg->size, arg->offset, + shader_type, tfile, &arg->shader_handle); - ret = ttm_read_lock(&vmaster->lock, true); + ttm_read_unlock(&vmaster->lock); +out_bad_arg: + vmw_dmabuf_unreference(&buffer); + return ret; +} + +/** + * vmw_compat_shader_lookup - Look up a compat shader + * + * @man: Pointer to the compat shader manager. + * @shader_type: The shader type, that combined with the user_key identifies + * the shader. + * @user_key: On entry, this should be a pointer to the user_key. + * On successful exit, it will contain the guest-backed shader's TTM handle. + * + * Returns 0 on success. Non-zero on failure, in which case the value pointed + * to by @user_key is unmodified. + */ +int vmw_compat_shader_lookup(struct vmw_compat_shader_manager *man, + SVGA3dShaderType shader_type, + u32 *user_key) +{ + struct drm_hash_item *hash; + int ret; + unsigned long key = *user_key | (shader_type << 24); + + ret = drm_ht_find_item(&man->shaders, key, &hash); if (unlikely(ret != 0)) return ret; - ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), - vmw_user_shader_size, - false, true); - if (unlikely(ret != 0)) { - if (ret != -ERESTARTSYS) - DRM_ERROR("Out of graphics memory for shader" - " creation.\n"); - goto out_unlock; + *user_key = drm_hash_entry(hash, struct vmw_compat_shader, + hash)->handle; + + return 0; +} + +/** + * vmw_compat_shader_free - Free a compat shader. + * + * @man: Pointer to the compat shader manager. + * @entry: Pointer to a struct vmw_compat_shader. + * + * Frees a struct vmw_compat_shder entry and drops its reference to the + * guest backed shader. + */ +static void vmw_compat_shader_free(struct vmw_compat_shader_manager *man, + struct vmw_compat_shader *entry) +{ + list_del(&entry->head); + WARN_ON(drm_ht_remove_item(&man->shaders, &entry->hash)); + WARN_ON(ttm_ref_object_base_unref(entry->tfile, entry->handle, + TTM_REF_USAGE)); + kfree(entry); +} + +/** + * vmw_compat_shaders_commit - Commit a list of compat shader actions. + * + * @man: Pointer to the compat shader manager. + * @list: Caller's list of compat shader actions. + * + * This function commits a list of compat shader additions or removals. + * It is typically called when the execbuf ioctl call triggering these + * actions has commited the fifo contents to the device. + */ +void vmw_compat_shaders_commit(struct vmw_compat_shader_manager *man, + struct list_head *list) +{ + struct vmw_compat_shader *entry, *next; + + list_for_each_entry_safe(entry, next, list, head) { + list_del(&entry->head); + switch (entry->state) { + case VMW_COMPAT_ADD: + entry->state = VMW_COMPAT_COMMITED; + list_add_tail(&entry->head, &man->list); + break; + case VMW_COMPAT_DEL: + ttm_ref_object_base_unref(entry->tfile, entry->handle, + TTM_REF_USAGE); + kfree(entry); + break; + default: + BUG(); + break; + } } +} - ushader = kzalloc(sizeof(*ushader), GFP_KERNEL); - if (unlikely(ushader == NULL)) { - ttm_mem_global_free(vmw_mem_glob(dev_priv), - vmw_user_shader_size); - ret = -ENOMEM; - goto out_unlock; +/** + * vmw_compat_shaders_revert - Revert a list of compat shader actions + * + * @man: Pointer to the compat shader manager. + * @list: Caller's list of compat shader actions. + * + * This function reverts a list of compat shader additions or removals. + * It is typically called when the execbuf ioctl call triggering these + * actions failed for some reason, and the command stream was never + * submitted. + */ +void vmw_compat_shaders_revert(struct vmw_compat_shader_manager *man, + struct list_head *list) +{ + struct vmw_compat_shader *entry, *next; + int ret; + + list_for_each_entry_safe(entry, next, list, head) { + switch (entry->state) { + case VMW_COMPAT_ADD: + vmw_compat_shader_free(man, entry); + break; + case VMW_COMPAT_DEL: + ret = drm_ht_insert_item(&man->shaders, &entry->hash); + list_del(&entry->head); + list_add_tail(&entry->head, &man->list); + entry->state = VMW_COMPAT_COMMITED; + break; + default: + BUG(); + break; + } } +} - res = &ushader->shader.res; - ushader->base.shareable = false; - ushader->base.tfile = NULL; +/** + * vmw_compat_shader_remove - Stage a compat shader for removal. + * + * @man: Pointer to the compat shader manager + * @user_key: The key that is used to identify the shader. The key is + * unique to the shader type. + * @shader_type: Shader type. + * @list: Caller's list of staged shader actions. + * + * This function stages a compat shader for removal and removes the key from + * the shader manager's hash table. If the shader was previously only staged + * for addition it is completely removed (But the execbuf code may keep a + * reference if it was bound to a context between addition and removal). If + * it was previously commited to the manager, it is staged for removal. + */ +int vmw_compat_shader_remove(struct vmw_compat_shader_manager *man, + u32 user_key, SVGA3dShaderType shader_type, + struct list_head *list) +{ + struct vmw_compat_shader *entry; + struct drm_hash_item *hash; + int ret; - /* - * From here on, the destructor takes over resource freeing. - */ + ret = drm_ht_find_item(&man->shaders, user_key | (shader_type << 24), + &hash); + if (likely(ret != 0)) + return -EINVAL; - ret = vmw_gb_shader_init(dev_priv, res, arg->size, - arg->offset, shader_type, buffer, - vmw_user_shader_free); + entry = drm_hash_entry(hash, struct vmw_compat_shader, hash); + + switch (entry->state) { + case VMW_COMPAT_ADD: + vmw_compat_shader_free(man, entry); + break; + case VMW_COMPAT_COMMITED: + (void) drm_ht_remove_item(&man->shaders, &entry->hash); + list_del(&entry->head); + entry->state = VMW_COMPAT_DEL; + list_add_tail(&entry->head, list); + break; + default: + BUG(); + break; + } + + return 0; +} + +/** + * vmw_compat_shader_add - Create a compat shader and add the + * key to the manager + * + * @man: Pointer to the compat shader manager + * @user_key: The key that is used to identify the shader. The key is + * unique to the shader type. + * @bytecode: Pointer to the bytecode of the shader. + * @shader_type: Shader type. + * @tfile: Pointer to a struct ttm_object_file that the guest-backed shader is + * to be created with. + * @list: Caller's list of staged shader actions. + * + * Note that only the key is added to the shader manager's hash table. + * The shader is not yet added to the shader manager's list of shaders. + */ +int vmw_compat_shader_add(struct vmw_compat_shader_manager *man, + u32 user_key, const void *bytecode, + SVGA3dShaderType shader_type, + size_t size, + struct ttm_object_file *tfile, + struct list_head *list) +{ + struct vmw_dma_buffer *buf; + struct ttm_bo_kmap_obj map; + bool is_iomem; + struct vmw_compat_shader *compat; + u32 handle; + int ret; + + if (user_key > ((1 << 24) - 1) || (unsigned) shader_type > 16) + return -EINVAL; + + /* Allocate and pin a DMA buffer */ + buf = kzalloc(sizeof(*buf), GFP_KERNEL); + if (unlikely(buf == NULL)) + return -ENOMEM; + + ret = vmw_dmabuf_init(man->dev_priv, buf, size, &vmw_sys_ne_placement, + true, vmw_dmabuf_bo_free); if (unlikely(ret != 0)) - goto out_unlock; + goto out; - tmp = vmw_resource_reference(res); - ret = ttm_base_object_init(tfile, &ushader->base, false, - VMW_RES_SHADER, - &vmw_user_shader_base_release, NULL); + ret = ttm_bo_reserve(&buf->base, false, true, false, NULL); + if (unlikely(ret != 0)) + goto no_reserve; + /* Map and copy shader bytecode. */ + ret = ttm_bo_kmap(&buf->base, 0, PAGE_ALIGN(size) >> PAGE_SHIFT, + &map); if (unlikely(ret != 0)) { - vmw_resource_unreference(&tmp); - goto out_err; + ttm_bo_unreserve(&buf->base); + goto no_reserve; } - arg->shader_handle = ushader->base.hash.key; -out_err: - vmw_resource_unreference(&res); -out_unlock: - ttm_read_unlock(&vmaster->lock); -out_bad_arg: - vmw_dmabuf_unreference(&buffer); + memcpy(ttm_kmap_obj_virtual(&map, &is_iomem), bytecode, size); + WARN_ON(is_iomem); + + ttm_bo_kunmap(&map); + ret = ttm_bo_validate(&buf->base, &vmw_sys_placement, false, true); + WARN_ON(ret != 0); + ttm_bo_unreserve(&buf->base); + + /* Create a guest-backed shader container backed by the dma buffer */ + ret = vmw_shader_alloc(man->dev_priv, buf, size, 0, shader_type, + tfile, &handle); + vmw_dmabuf_unreference(&buf); + if (unlikely(ret != 0)) + goto no_reserve; + /* + * Create a compat shader structure and stage it for insertion + * in the manager + */ + compat = kzalloc(sizeof(*compat), GFP_KERNEL); + if (compat == NULL) + goto no_compat; + + compat->hash.key = user_key | (shader_type << 24); + ret = drm_ht_insert_item(&man->shaders, &compat->hash); + if (unlikely(ret != 0)) + goto out_invalid_key; + + compat->state = VMW_COMPAT_ADD; + compat->handle = handle; + compat->tfile = tfile; + list_add_tail(&compat->head, list); + return 0; + +out_invalid_key: + kfree(compat); +no_compat: + ttm_ref_object_base_unref(tfile, handle, TTM_REF_USAGE); +no_reserve: +out: return ret; +} + +/** + * vmw_compat_shader_man_create - Create a compat shader manager + * + * @dev_priv: Pointer to a device private structure. + * + * Typically done at file open time. If successful returns a pointer to a + * compat shader manager. Otherwise returns an error pointer. + */ +struct vmw_compat_shader_manager * +vmw_compat_shader_man_create(struct vmw_private *dev_priv) +{ + struct vmw_compat_shader_manager *man; + int ret; + + man = kzalloc(sizeof(*man), GFP_KERNEL); + + man->dev_priv = dev_priv; + INIT_LIST_HEAD(&man->list); + ret = drm_ht_create(&man->shaders, VMW_COMPAT_SHADER_HT_ORDER); + if (ret == 0) + return man; + + kfree(man); + return ERR_PTR(ret); +} + +/** + * vmw_compat_shader_man_destroy - Destroy a compat shader manager + * + * @man: Pointer to the shader manager to destroy. + * + * Typically done at file close time. + */ +void vmw_compat_shader_man_destroy(struct vmw_compat_shader_manager *man) +{ + struct vmw_compat_shader *entry, *next; + + mutex_lock(&man->dev_priv->cmdbuf_mutex); + list_for_each_entry_safe(entry, next, &man->list, head) + vmw_compat_shader_free(man, entry); + mutex_unlock(&man->dev_priv->cmdbuf_mutex); + kfree(man); } -- cgit v1.2.3