| /* |
| * Legacy: Generic DRM Contexts |
| * |
| * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. |
| * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| * All Rights Reserved. |
| * |
| * Author: Rickard E. (Rik) Faith <faith@valinux.com> |
| * Author: Gareth Hughes <gareth@valinux.com> |
| * |
| * 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 (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 NONINFRINGEMENT. IN NO EVENT SHALL |
| * VA LINUX SYSTEMS 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 <linux/slab.h> |
| #include <linux/uaccess.h> |
| |
| #include <drm/drm_drv.h> |
| #include <drm/drm_file.h> |
| #include <drm/drm_print.h> |
| |
| #include "drm_legacy.h" |
| |
| struct drm_ctx_list { |
| struct list_head head; |
| drm_context_t handle; |
| struct drm_file *tag; |
| }; |
| |
| /******************************************************************/ |
| /** \name Context bitmap support */ |
| /*@{*/ |
| |
| /* |
| * Free a handle from the context bitmap. |
| * |
| * \param dev DRM device. |
| * \param ctx_handle context handle. |
| * |
| * Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry |
| * in drm_device::ctx_idr, while holding the drm_device::struct_mutex |
| * lock. |
| */ |
| void drm_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle) |
| { |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return; |
| |
| mutex_lock(&dev->struct_mutex); |
| idr_remove(&dev->ctx_idr, ctx_handle); |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| /* |
| * Context bitmap allocation. |
| * |
| * \param dev DRM device. |
| * \return (non-negative) context handle on success or a negative number on failure. |
| * |
| * Allocate a new idr from drm_device::ctx_idr while holding the |
| * drm_device::struct_mutex lock. |
| */ |
| static int drm_legacy_ctxbitmap_next(struct drm_device * dev) |
| { |
| int ret; |
| |
| mutex_lock(&dev->struct_mutex); |
| ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0, |
| GFP_KERNEL); |
| mutex_unlock(&dev->struct_mutex); |
| return ret; |
| } |
| |
| /* |
| * Context bitmap initialization. |
| * |
| * \param dev DRM device. |
| * |
| * Initialise the drm_device::ctx_idr |
| */ |
| void drm_legacy_ctxbitmap_init(struct drm_device * dev) |
| { |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return; |
| |
| idr_init(&dev->ctx_idr); |
| } |
| |
| /* |
| * Context bitmap cleanup. |
| * |
| * \param dev DRM device. |
| * |
| * Free all idr members using drm_ctx_sarea_free helper function |
| * while holding the drm_device::struct_mutex lock. |
| */ |
| void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev) |
| { |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return; |
| |
| mutex_lock(&dev->struct_mutex); |
| idr_destroy(&dev->ctx_idr); |
| mutex_unlock(&dev->struct_mutex); |
| } |
| |
| /** |
| * drm_ctxbitmap_flush() - Flush all contexts owned by a file |
| * @dev: DRM device to operate on |
| * @file: Open file to flush contexts for |
| * |
| * This iterates over all contexts on @dev and drops them if they're owned by |
| * @file. Note that after this call returns, new contexts might be added if |
| * the file is still alive. |
| */ |
| void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file) |
| { |
| struct drm_ctx_list *pos, *tmp; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return; |
| |
| mutex_lock(&dev->ctxlist_mutex); |
| |
| list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) { |
| if (pos->tag == file && |
| pos->handle != DRM_KERNEL_CONTEXT) { |
| if (dev->driver->context_dtor) |
| dev->driver->context_dtor(dev, pos->handle); |
| |
| drm_legacy_ctxbitmap_free(dev, pos->handle); |
| list_del(&pos->head); |
| kfree(pos); |
| } |
| } |
| |
| mutex_unlock(&dev->ctxlist_mutex); |
| } |
| |
| /*@}*/ |
| |
| /******************************************************************/ |
| /** \name Per Context SAREA Support */ |
| /*@{*/ |
| |
| /* |
| * Get per-context SAREA. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx_priv_map structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Gets the map from drm_device::ctx_idr with the handle specified and |
| * returns its handle. |
| */ |
| int drm_legacy_getsareactx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx_priv_map *request = data; |
| struct drm_local_map *map; |
| struct drm_map_list *_entry; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| mutex_lock(&dev->struct_mutex); |
| |
| map = idr_find(&dev->ctx_idr, request->ctx_id); |
| if (!map) { |
| mutex_unlock(&dev->struct_mutex); |
| return -EINVAL; |
| } |
| |
| request->handle = NULL; |
| list_for_each_entry(_entry, &dev->maplist, head) { |
| if (_entry->map == map) { |
| request->handle = |
| (void *)(unsigned long)_entry->user_token; |
| break; |
| } |
| } |
| |
| mutex_unlock(&dev->struct_mutex); |
| |
| if (request->handle == NULL) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| /* |
| * Set per-context SAREA. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx_priv_map structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Searches the mapping specified in \p arg and update the entry in |
| * drm_device::ctx_idr with it. |
| */ |
| int drm_legacy_setsareactx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx_priv_map *request = data; |
| struct drm_local_map *map = NULL; |
| struct drm_map_list *r_list = NULL; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| mutex_lock(&dev->struct_mutex); |
| list_for_each_entry(r_list, &dev->maplist, head) { |
| if (r_list->map |
| && r_list->user_token == (unsigned long) request->handle) |
| goto found; |
| } |
| bad: |
| mutex_unlock(&dev->struct_mutex); |
| return -EINVAL; |
| |
| found: |
| map = r_list->map; |
| if (!map) |
| goto bad; |
| |
| if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id))) |
| goto bad; |
| |
| mutex_unlock(&dev->struct_mutex); |
| |
| return 0; |
| } |
| |
| /*@}*/ |
| |
| /******************************************************************/ |
| /** \name The actual DRM context handling routines */ |
| /*@{*/ |
| |
| /* |
| * Switch context. |
| * |
| * \param dev DRM device. |
| * \param old old context handle. |
| * \param new new context handle. |
| * \return zero on success or a negative number on failure. |
| * |
| * Attempt to set drm_device::context_flag. |
| */ |
| static int drm_context_switch(struct drm_device * dev, int old, int new) |
| { |
| if (test_and_set_bit(0, &dev->context_flag)) { |
| DRM_ERROR("Reentering -- FIXME\n"); |
| return -EBUSY; |
| } |
| |
| DRM_DEBUG("Context switch from %d to %d\n", old, new); |
| |
| if (new == dev->last_context) { |
| clear_bit(0, &dev->context_flag); |
| return 0; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Complete context switch. |
| * |
| * \param dev DRM device. |
| * \param new new context handle. |
| * \return zero on success or a negative number on failure. |
| * |
| * Updates drm_device::last_context and drm_device::last_switch. Verifies the |
| * hardware lock is held, clears the drm_device::context_flag and wakes up |
| * drm_device::context_wait. |
| */ |
| static int drm_context_switch_complete(struct drm_device *dev, |
| struct drm_file *file_priv, int new) |
| { |
| dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ |
| |
| if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) { |
| DRM_ERROR("Lock isn't held after context switch\n"); |
| } |
| |
| /* If a context switch is ever initiated |
| when the kernel holds the lock, release |
| that lock here. |
| */ |
| clear_bit(0, &dev->context_flag); |
| |
| return 0; |
| } |
| |
| /* |
| * Reserve contexts. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx_res structure. |
| * \return zero on success or a negative number on failure. |
| */ |
| int drm_legacy_resctx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx_res *res = data; |
| struct drm_ctx ctx; |
| int i; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| if (res->count >= DRM_RESERVED_CONTEXTS) { |
| memset(&ctx, 0, sizeof(ctx)); |
| for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { |
| ctx.handle = i; |
| if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx))) |
| return -EFAULT; |
| } |
| } |
| res->count = DRM_RESERVED_CONTEXTS; |
| |
| return 0; |
| } |
| |
| /* |
| * Add context. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Get a new handle for the context and copy to userspace. |
| */ |
| int drm_legacy_addctx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx_list *ctx_entry; |
| struct drm_ctx *ctx = data; |
| int tmp_handle; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| tmp_handle = drm_legacy_ctxbitmap_next(dev); |
| if (tmp_handle == DRM_KERNEL_CONTEXT) { |
| /* Skip kernel's context and get a new one. */ |
| tmp_handle = drm_legacy_ctxbitmap_next(dev); |
| } |
| DRM_DEBUG("%d\n", tmp_handle); |
| if (tmp_handle < 0) { |
| DRM_DEBUG("Not enough free contexts.\n"); |
| /* Should this return -EBUSY instead? */ |
| return tmp_handle; |
| } |
| |
| ctx->handle = tmp_handle; |
| |
| ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL); |
| if (!ctx_entry) { |
| DRM_DEBUG("out of memory\n"); |
| return -ENOMEM; |
| } |
| |
| INIT_LIST_HEAD(&ctx_entry->head); |
| ctx_entry->handle = ctx->handle; |
| ctx_entry->tag = file_priv; |
| |
| mutex_lock(&dev->ctxlist_mutex); |
| list_add(&ctx_entry->head, &dev->ctxlist); |
| mutex_unlock(&dev->ctxlist_mutex); |
| |
| return 0; |
| } |
| |
| /* |
| * Get context. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx structure. |
| * \return zero on success or a negative number on failure. |
| */ |
| int drm_legacy_getctx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx *ctx = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| /* This is 0, because we don't handle any context flags */ |
| ctx->flags = 0; |
| |
| return 0; |
| } |
| |
| /* |
| * Switch context. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Calls context_switch(). |
| */ |
| int drm_legacy_switchctx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx *ctx = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| DRM_DEBUG("%d\n", ctx->handle); |
| return drm_context_switch(dev, dev->last_context, ctx->handle); |
| } |
| |
| /* |
| * New context. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * Calls context_switch_complete(). |
| */ |
| int drm_legacy_newctx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx *ctx = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| DRM_DEBUG("%d\n", ctx->handle); |
| drm_context_switch_complete(dev, file_priv, ctx->handle); |
| |
| return 0; |
| } |
| |
| /* |
| * Remove context. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument pointing to a drm_ctx structure. |
| * \return zero on success or a negative number on failure. |
| * |
| * If not the special kernel context, calls ctxbitmap_free() to free the specified context. |
| */ |
| int drm_legacy_rmctx(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_ctx *ctx = data; |
| |
| if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) && |
| !drm_core_check_feature(dev, DRIVER_LEGACY)) |
| return -EOPNOTSUPP; |
| |
| DRM_DEBUG("%d\n", ctx->handle); |
| if (ctx->handle != DRM_KERNEL_CONTEXT) { |
| if (dev->driver->context_dtor) |
| dev->driver->context_dtor(dev, ctx->handle); |
| drm_legacy_ctxbitmap_free(dev, ctx->handle); |
| } |
| |
| mutex_lock(&dev->ctxlist_mutex); |
| if (!list_empty(&dev->ctxlist)) { |
| struct drm_ctx_list *pos, *n; |
| |
| list_for_each_entry_safe(pos, n, &dev->ctxlist, head) { |
| if (pos->handle == ctx->handle) { |
| list_del(&pos->head); |
| kfree(pos); |
| } |
| } |
| } |
| mutex_unlock(&dev->ctxlist_mutex); |
| |
| return 0; |
| } |
| |
| /*@}*/ |