From f4092abdf94af6a99aff944d6264bc1284e8bdd4 Mon Sep 17 00:00:00 2001 From: Reinhard Tartler Date: Mon, 10 Oct 2011 17:43:39 +0200 Subject: Imported nx-X11-3.1.0-1.tar.gz Summary: Imported nx-X11-3.1.0-1.tar.gz Keywords: Imported nx-X11-3.1.0-1.tar.gz into Git repository --- nx-X11/extras/drm/linux-core/drm_context.c | 590 +++++++++++++++++++++++++++++ 1 file changed, 590 insertions(+) create mode 100644 nx-X11/extras/drm/linux-core/drm_context.c (limited to 'nx-X11/extras/drm/linux-core/drm_context.c') diff --git a/nx-X11/extras/drm/linux-core/drm_context.c b/nx-X11/extras/drm/linux-core/drm_context.c new file mode 100644 index 000000000..5947c8e6d --- /dev/null +++ b/nx-X11/extras/drm/linux-core/drm_context.c @@ -0,0 +1,590 @@ +/** + * \file drm_context.c + * IOCTLs for generic contexts + * + * \author Rickard E. (Rik) Faith + * \author Gareth Hughes + */ + +/* + * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com + * + * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * All Rights Reserved. + * + * 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. + */ + +/* + * ChangeLog: + * 2001-11-16 Torsten Duwe + * added context constructor/destructor hooks, + * needed by SiS driver's memory management. + */ + +#include "drmP.h" + +/******************************************************************/ +/** \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::context_sareas, while holding the drm_device::struct_sem + * lock. + */ +void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle) +{ + if (ctx_handle < 0) + goto failed; + if (!dev->ctx_bitmap) + goto failed; + + if (ctx_handle < DRM_MAX_CTXBITMAP) { + down(&dev->struct_sem); + clear_bit(ctx_handle, dev->ctx_bitmap); + dev->context_sareas[ctx_handle] = NULL; + up(&dev->struct_sem); + return; + } + failed: + DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle); + return; +} + +/** + * Context bitmap allocation. + * + * \param dev DRM device. + * \return (non-negative) context handle on success or a negative number on failure. + * + * Find the first zero bit in drm_device::ctx_bitmap and (re)allocates + * drm_device::context_sareas to accommodate the new entry while holding the + * drm_device::struct_sem lock. + */ +static int drm_ctxbitmap_next(drm_device_t * dev) +{ + int bit; + + if (!dev->ctx_bitmap) + return -1; + + down(&dev->struct_sem); + bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP); + if (bit < DRM_MAX_CTXBITMAP) { + set_bit(bit, dev->ctx_bitmap); + DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit); + if ((bit + 1) > dev->max_context) { + dev->max_context = (bit + 1); + if (dev->context_sareas) { + drm_map_t **ctx_sareas; + + ctx_sareas = drm_realloc(dev->context_sareas, + (dev->max_context - + 1) * + sizeof(*dev-> + context_sareas), + dev->max_context * + sizeof(*dev-> + context_sareas), + DRM_MEM_MAPS); + if (!ctx_sareas) { + clear_bit(bit, dev->ctx_bitmap); + up(&dev->struct_sem); + return -1; + } + dev->context_sareas = ctx_sareas; + dev->context_sareas[bit] = NULL; + } else { + /* max_context == 1 at this point */ + dev->context_sareas = + drm_alloc(dev->max_context * + sizeof(*dev->context_sareas), + DRM_MEM_MAPS); + if (!dev->context_sareas) { + clear_bit(bit, dev->ctx_bitmap); + up(&dev->struct_sem); + return -1; + } + dev->context_sareas[bit] = NULL; + } + } + up(&dev->struct_sem); + return bit; + } + up(&dev->struct_sem); + return -1; +} + +/** + * Context bitmap initialization. + * + * \param dev DRM device. + * + * Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding + * the drm_device::struct_sem lock. + */ +int drm_ctxbitmap_init(drm_device_t * dev) +{ + int i; + int temp; + + down(&dev->struct_sem); + dev->ctx_bitmap = (unsigned long *)drm_alloc(PAGE_SIZE, + DRM_MEM_CTXBITMAP); + if (dev->ctx_bitmap == NULL) { + up(&dev->struct_sem); + return -ENOMEM; + } + memset((void *)dev->ctx_bitmap, 0, PAGE_SIZE); + dev->context_sareas = NULL; + dev->max_context = -1; + up(&dev->struct_sem); + + for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { + temp = drm_ctxbitmap_next(dev); + DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp); + } + + return 0; +} + +/** + * Context bitmap cleanup. + * + * \param dev DRM device. + * + * Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding + * the drm_device::struct_sem lock. + */ +void drm_ctxbitmap_cleanup(drm_device_t * dev) +{ + down(&dev->struct_sem); + if (dev->context_sareas) + drm_free(dev->context_sareas, + sizeof(*dev->context_sareas) * + dev->max_context, DRM_MEM_MAPS); + drm_free((void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP); + up(&dev->struct_sem); +} + +/*@}*/ + +/******************************************************************/ +/** \name Per Context SAREA Support */ +/*@{*/ + +/** + * Get per-context SAREA. + * + * \param inode device inode. + * \param filp file pointer. + * \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::context_sareas with the handle specified and + * returns its handle. + */ +int drm_getsareactx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_ctx_priv_map_t __user *argp = (void __user *)arg; + drm_ctx_priv_map_t request; + drm_map_t *map; + drm_map_list_t *_entry; + + if (copy_from_user(&request, argp, sizeof(request))) + return -EFAULT; + + down(&dev->struct_sem); + if (dev->max_context < 0 + || request.ctx_id >= (unsigned)dev->max_context) { + up(&dev->struct_sem); + return -EINVAL; + } + + map = dev->context_sareas[request.ctx_id]; + up(&dev->struct_sem); + + request.handle = 0; + list_for_each_entry(_entry, &dev->maplist->head,head) { + if (_entry->map == map) { + request.handle = (void *)(unsigned long)_entry->user_token; + break; + } + } + if (request.handle == 0) + return -EINVAL; + + if (copy_to_user(argp, &request, sizeof(request))) + return -EFAULT; + return 0; +} + +/** + * Set per-context SAREA. + * + * \param inode device inode. + * \param filp file pointer. + * \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::context_sareas with it. + */ +int drm_setsareactx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_ctx_priv_map_t request; + drm_map_t *map = NULL; + drm_map_list_t *r_list = NULL; + struct list_head *list; + + if (copy_from_user(&request, + (drm_ctx_priv_map_t __user *) arg, sizeof(request))) + return -EFAULT; + + down(&dev->struct_sem); + list_for_each(list, &dev->maplist->head) { + r_list = list_entry(list, drm_map_list_t, head); + if (r_list->map + && r_list->user_token == (unsigned long) request.handle) + goto found; + } + bad: + up(&dev->struct_sem); + return -EINVAL; + + found: + map = r_list->map; + if (!map) + goto bad; + if (dev->max_context < 0) + goto bad; + if (request.ctx_id >= (unsigned)dev->max_context) + goto bad; + dev->context_sareas[request.ctx_id] = map; + up(&dev->struct_sem); + 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(drm_device_t * 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. + */ +int drm_context_switch_complete(drm_device_t * dev, int new) +{ + dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ + dev->last_switch = jiffies; + + if (!_DRM_LOCK_IS_HELD(dev->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); + wake_up(&dev->context_wait); + + return 0; +} + +/** + * Reserve contexts. + * + * \param inode device inode. + * \param filp file pointer. + * \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_resctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_ctx_res_t res; + drm_ctx_t __user *argp = (void __user *)arg; + drm_ctx_t ctx; + int i; + + if (copy_from_user(&res, argp, sizeof(res))) + return -EFAULT; + + 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; + + if (copy_to_user(argp, &res, sizeof(res))) + return -EFAULT; + return 0; +} + +/** + * Add context. + * + * \param inode device inode. + * \param filp file pointer. + * \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_addctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_ctx_list_t *ctx_entry; + drm_ctx_t __user *argp = (void __user *)arg; + drm_ctx_t ctx; + + if (copy_from_user(&ctx, argp, sizeof(ctx))) + return -EFAULT; + + ctx.handle = drm_ctxbitmap_next(dev); + if (ctx.handle == DRM_KERNEL_CONTEXT) { + /* Skip kernel's context and get a new one. */ + ctx.handle = drm_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; + } + + if (ctx.handle != DRM_KERNEL_CONTEXT) { + if (dev->driver->context_ctor) + dev->driver->context_ctor(dev, ctx.handle); + } + + ctx_entry = drm_alloc(sizeof(*ctx_entry), DRM_MEM_CTXLIST); + 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 = priv; + + down(&dev->ctxlist_sem); + list_add(&ctx_entry->head, &dev->ctxlist->head); + ++dev->ctx_count; + up(&dev->ctxlist_sem); + + if (copy_to_user(argp, &ctx, sizeof(ctx))) + return -EFAULT; + return 0; +} + +int drm_modctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + /* This does nothing */ + return 0; +} + +/** + * Get context. + * + * \param inode device inode. + * \param filp file pointer. + * \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_getctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_ctx_t __user *argp = (void __user *)arg; + drm_ctx_t ctx; + + if (copy_from_user(&ctx, argp, sizeof(ctx))) + return -EFAULT; + + /* This is 0, because we don't handle any context flags */ + ctx.flags = 0; + + if (copy_to_user(argp, &ctx, sizeof(ctx))) + return -EFAULT; + return 0; +} + +/** + * Switch context. + * + * \param inode device inode. + * \param filp file pointer. + * \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_switchctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_ctx_t ctx; + + if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx))) + return -EFAULT; + + DRM_DEBUG("%d\n", ctx.handle); + return drm_context_switch(dev, dev->last_context, ctx.handle); +} + +/** + * New context. + * + * \param inode device inode. + * \param filp file pointer. + * \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_newctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_ctx_t ctx; + + if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx))) + return -EFAULT; + + DRM_DEBUG("%d\n", ctx.handle); + drm_context_switch_complete(dev, ctx.handle); + + return 0; +} + +/** + * Remove context. + * + * \param inode device inode. + * \param filp file pointer. + * \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_rmctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +{ + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; + drm_ctx_t ctx; + + if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx))) + return -EFAULT; + + DRM_DEBUG("%d\n", ctx.handle); + if (ctx.handle == DRM_KERNEL_CONTEXT + 1) { + priv->remove_auth_on_close = 1; + } + if (ctx.handle != DRM_KERNEL_CONTEXT) { + if (dev->driver->context_dtor) + dev->driver->context_dtor(dev, ctx.handle); + drm_ctxbitmap_free(dev, ctx.handle); + } + + down(&dev->ctxlist_sem); + if (!list_empty(&dev->ctxlist->head)) { + drm_ctx_list_t *pos, *n; + + list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) { + if (pos->handle == ctx.handle) { + list_del(&pos->head); + drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); + --dev->ctx_count; + } + } + } + up(&dev->ctxlist_sem); + + return 0; +} + +/*@}*/ -- cgit v1.2.3