diff options
Diffstat (limited to 'drivers/gpu/drm/drm_context.c')
| -rw-r--r-- | drivers/gpu/drm/drm_context.c | 525 |
1 files changed, 525 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_context.c b/drivers/gpu/drm/drm_context.c new file mode 100644 index 000000000..c6e6a3e72 --- /dev/null +++ b/drivers/gpu/drm/drm_context.c @@ -0,0 +1,525 @@ +/* + * 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_legacy_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; +} + +/*@}*/ |