/* * 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 <drm/drmP.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 -EINVAL; 	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 -EINVAL; 	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 -EINVAL; 	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; 	if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&	    !drm_core_check_feature(dev, DRIVER_LEGACY))		return -EINVAL; 	ctx->handle = drm_legacy_ctxbitmap_next(dev);	if (ctx->handle == DRM_KERNEL_CONTEXT) {		/* Skip kernel's context and get a new one. */		ctx->handle = drm_legacy_ctxbitmap_next(dev);	}	DRM_DEBUG("%d\n", ctx->handle);	if (ctx->handle == -1) {		DRM_DEBUG("Not enough free contexts.\n");		/* Should this return -EBUSY instead? */		return -ENOMEM;	} 	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 -EINVAL; 	/* 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 -EINVAL; 	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 -EINVAL; 	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 -EINVAL; 	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)) {

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