drm/linux-core/drm_context.c

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/**
* \file drm_context.c
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* IOCTLs for generic contexts
*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*/
/*
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* 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.
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*/
/*
* ChangeLog:
* 2001-11-16 Torsten Duwe <duwe@caldera.de>
* added context constructor/destructor hooks,
* needed by SiS driver's memory management.
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*/
#include "drmP.h"
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/******************************************************************/
/** \name Context bitmap support */
/*@{*/
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/**
* 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
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* lock.
*/
void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle)
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{
struct drm_ctx_sarea_list *ctx;
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mutex_lock(&dev->struct_mutex);
ctx = idr_find(&dev->ctx_idr, ctx_handle);
if (ctx) {
idr_remove(&dev->ctx_idr, ctx_handle);
drm_free(ctx, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
} else
DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle);
mutex_unlock(&dev->struct_mutex);
return;
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}
/**
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* 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.
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*/
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static int drm_ctxbitmap_next(drm_device_t * dev)
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{
int new_id;
int ret;
struct drm_ctx_sarea_list *new_ctx;
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new_ctx = drm_calloc(1, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
if (!new_ctx)
return -1;
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again:
if (idr_pre_get(&dev->ctx_idr, GFP_KERNEL) == 0) {
DRM_ERROR("Out of memory expanding drawable idr\n");
drm_free(new_ctx, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
return -ENOMEM;
}
mutex_lock(&dev->struct_mutex);
ret = idr_get_new_above(&dev->ctx_idr, new_ctx, DRM_RESERVED_CONTEXTS, &new_id);
if (ret == -EAGAIN) {
mutex_unlock(&dev->struct_mutex);
goto again;
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}
mutex_unlock(&dev->struct_mutex);
return new_id;
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}
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/**
* Context bitmap initialization.
*
* \param dev DRM device.
*
* Initialise the drm_device::ctx_idr
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*/
int drm_ctxbitmap_init(drm_device_t * dev)
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{
idr_init(&dev->ctx_idr);
return 0;
}
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static int drm_ctx_sarea_free(int id, void *p, void *data)
{
struct drm_ctx_sarea_list *ctx_entry = p;
drm_free(ctx_entry, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
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return 0;
}
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/**
* 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.
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*/
void drm_ctxbitmap_cleanup(drm_device_t * dev)
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{
mutex_lock(&dev->struct_mutex);
idr_for_each(&dev->ctx_idr, drm_ctx_sarea_free, NULL);
idr_remove_all(&dev->ctx_idr);
mutex_unlock(&dev->struct_mutex);
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}
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/*@}*/
/******************************************************************/
/** \name Per Context SAREA Support */
/*@{*/
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/**
* Get per-context SAREA.
*
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* \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::ctx_idr with the handle specified and
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* returns its handle.
*/
int drm_getsareactx(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
drm_ctx_priv_map_t __user *argp = (void __user *)arg;
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drm_ctx_priv_map_t request;
drm_map_t *map;
drm_map_list_t *_entry;
struct drm_ctx_sarea_list *ctx_sarea;
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if (copy_from_user(&request, argp, sizeof(request)))
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return -EFAULT;
mutex_lock(&dev->struct_mutex);
ctx_sarea = idr_find(&dev->ctx_idr, request.ctx_id);
if (!ctx_sarea) {
mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
}
map = ctx_sarea->map;
mutex_unlock(&dev->struct_mutex);
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request.handle = NULL;
list_for_each_entry(_entry, &dev->maplist, head) {
if (_entry->map == map) {
request.handle =
(void *)(unsigned long)_entry->user_token;
break;
}
}
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if (request.handle == NULL)
return -EINVAL;
if (copy_to_user(argp, &request, sizeof(request)))
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return -EFAULT;
return 0;
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}
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/**
* Set per-context SAREA.
*
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* \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::ctx_idr with it.
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*/
int drm_setsareactx(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
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drm_ctx_priv_map_t request;
drm_map_t *map = NULL;
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drm_map_list_t *r_list = NULL;
struct drm_ctx_sarea_list *ctx_sarea;
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if (copy_from_user(&request,
(drm_ctx_priv_map_t __user *) arg, sizeof(request)))
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return -EFAULT;
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;
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}
bad:
mutex_unlock(&dev->struct_mutex);
return -EINVAL;
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found:
map = r_list->map;
if (!map)
goto bad;
mutex_lock(&dev->struct_mutex);
ctx_sarea = idr_find(&dev->ctx_idr, request.ctx_id);
if (!ctx_sarea)
goto bad;
ctx_sarea->map = map;
mutex_unlock(&dev->struct_mutex);
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return 0;
}
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/*@}*/
/******************************************************************/
/** \name The actual DRM context handling routines */
/*@{*/
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/**
* 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.
*/
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static int drm_context_switch(drm_device_t * dev, int old, int new)
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{
if (test_and_set_bit(0, &dev->context_flag)) {
DRM_ERROR("Reentering -- FIXME\n");
return -EBUSY;
}
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DRM_DEBUG("Context switch from %d to %d\n", old, new);
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if (new == dev->last_context) {
clear_bit(0, &dev->context_flag);
return 0;
}
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return 0;
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}
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/**
* 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(drm_device_t * dev, int new)
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{
dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
dev->last_switch = jiffies;
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if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("Lock isn't held after context switch\n");
}
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/* 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);
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return 0;
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}
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/**
* 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)
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{
drm_ctx_res_t res;
drm_ctx_t __user *argp = (void __user *)arg;
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drm_ctx_t ctx;
int i;
if (copy_from_user(&res, argp, sizeof(res)))
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return -EFAULT;
if (res.count >= DRM_RESERVED_CONTEXTS) {
memset(&ctx, 0, sizeof(ctx));
for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
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ctx.handle = i;
if (copy_to_user(&res.contexts[i], &ctx, sizeof(ctx)))
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return -EFAULT;
}
}
res.count = DRM_RESERVED_CONTEXTS;
if (copy_to_user(argp, &res, sizeof(res)))
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return -EFAULT;
return 0;
}
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/**
* 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)
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{
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;
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drm_ctx_t ctx;
if (copy_from_user(&ctx, argp, sizeof(ctx)))
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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);
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}
DRM_DEBUG("%d\n", ctx.handle);
if (ctx.handle == -1) {
DRM_DEBUG("Not enough free contexts.\n");
/* Should this return -EBUSY instead? */
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return -ENOMEM;
}
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if (ctx.handle != DRM_KERNEL_CONTEXT) {
if (dev->driver->context_ctor)
if (!dev->driver->context_ctor(dev, ctx.handle)) {
DRM_DEBUG("Running out of ctxs or memory.\n");
return -ENOMEM;
}
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}
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;
mutex_lock(&dev->ctxlist_mutex);
list_add(&ctx_entry->head, &dev->ctxlist);
++dev->ctx_count;
mutex_unlock(&dev->ctxlist_mutex);
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if (copy_to_user(argp, &ctx, sizeof(ctx)))
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return -EFAULT;
return 0;
}
int drm_modctx(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
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{
/* This does nothing */
return 0;
}
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/**
* 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)
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{
drm_ctx_t __user *argp = (void __user *)arg;
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drm_ctx_t ctx;
if (copy_from_user(&ctx, argp, sizeof(ctx)))
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return -EFAULT;
/* This is 0, because we don't handle any context flags */
ctx.flags = 0;
if (copy_to_user(argp, &ctx, sizeof(ctx)))
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return -EFAULT;
return 0;
}
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/**
* 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)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
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drm_ctx_t ctx;
if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
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return -EFAULT;
DRM_DEBUG("%d\n", ctx.handle);
return drm_context_switch(dev, dev->last_context, ctx.handle);
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}
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/**
* 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)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
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drm_ctx_t ctx;
if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
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return -EFAULT;
DRM_DEBUG("%d\n", ctx.handle);
drm_context_switch_complete(dev, ctx.handle);
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return 0;
}
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/**
* 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)
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{
drm_file_t *priv = filp->private_data;
drm_device_t *dev = priv->head->dev;
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drm_ctx_t ctx;
if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx)))
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return -EFAULT;
DRM_DEBUG("%d\n", ctx.handle);
if (ctx.handle == DRM_KERNEL_CONTEXT + 1) {
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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);
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}
mutex_lock(&dev->ctxlist_mutex);
if (!list_empty(&dev->ctxlist)) {
drm_ctx_list_t *pos, *n;
list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
if (pos->handle == ctx.handle) {
list_del(&pos->head);
drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST);
--dev->ctx_count;
}
}
}
mutex_unlock(&dev->ctxlist_mutex);
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return 0;
}
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/*@}*/