index : renesas/drm.git	android live master
	libdrm, cloned from git://anongit.freedesktop.org/mesa/drm	Laurent Pinchart

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log msg author committer range

path: root/linux-core

Age	Commit message (Expand)	Author
2006-02-21	set dma pages reserved	Dave Airlie
2006-02-21	use coherent memory for PCI allocations with COMP flag	Dave Airlie
2006-02-19	experimental PCI DMA fixes use proper Linux interfaces	Dave Airlie
2006-02-18	make some functions static from the kernel	Dave Airlie
2006-02-18	always enable and set master on pci device	Dave Airlie
2006-02-18	fix build wrong function call	Dave Airlie
2006-02-18	major realigment of DRM CVS with kernel code, makes integration much easier	Dave Airlie
2006-02-18	fix card unload	Dave Airlie
2006-02-18	Fixup test for memory at end of memory space	Dave Airlie
2006-01-26	add missing name, desc, date, major, minor and patchlevel entries	Alan Hourihane
2006-01-12	via: direction bug in get_user_pages call in via_dmablit.c fixed. Bumped	Thomas Hellstrom
2006-01-06	via: Combine PCI DMA transfers with stride==width (Idea from Luc	Thomas Hellstrom
2006-01-02	nothing from VIA or S3 in this	Dave Airlie
2006-01-02	use drm_cards_limit instead of cards_limit	Dave Airlie
2006-01-02	use common read/write routines	Dave Airlie
2006-01-02	sparse cleanups	Dave Airlie
2006-01-02	align spacing with kernel	Dave Airlie
2006-01-02	Realign via driver with changes in Linux kernel (mainly whitespace)	Dave Airlie
2005-12-28	Add vblank support to i915 DRM..	Dave Airlie
2005-12-04	Fix from SuSE for issue with context creation failure	Dave Airlie
2005-11-29	Fix from Hugh Dickins for consistent mapping	Dave Airlie
2005-11-15	Loosen via dmablit alignment checks somewhat. Adapt stride check to maximum	Thomas Hellstrom
2005-11-11	enable i915 32/64 bit ioctls	Dave Airlie
2005-11-11	i810 should be fine with i810.. no idea what this crack is ..	Dave Airlie
2005-11-11	whitespace align with kernel	Dave Airlie
2005-11-11	realign whitespace with kernel	Dave Airlie
2005-11-11	A bunch of create_proc_dir_entry() calls creating directories had crept in	Dave Airlie
2005-11-11	convert to use __set_current_state, align some header includes	Dave Airlie
2005-11-11	whitespace align closer with kernel	Dave Airlie
2005-11-11	cleanup ioctl/max_ioctl to use header file for extern symbols	Dave Airlie
2005-11-10	Fix cpu_to_le32 same as kernel not sure it is correct for ppc	Dave Airlie
2005-11-10	cleanup / whitespace align with kernel	Dave Airlie
2005-11-08	Initial port of savage to FreeBSD for the AGP and !ShadowStatus case. Adds	Eric Anholt
2005-11-08	Catch FreeBSD up to the pcie gart changes. Required minor modification to	Eric Anholt
2005-11-07	Fix bug #4908 for now. Alternative is highlighted in this bug report as the	Alan Hourihane
2005-11-03	Converts the remaining drm_agp_foo functions to be a drm_agp_foo and	Ian Romanick
2005-10-23	we don't use this stuff anymore .. remove 1k buffer from driver ..	Dave Airlie
2005-10-21	Don't set MTRR's for intel hardware	Alan Hourihane
2005-10-20	via: PCI DMA bugfixes and DOS due to too many mapped pages checks.	Thomas Hellstrom
2005-10-11	The Linux 2.6.9 (and earlier) fops structure does not contain a	Ian Romanick
2005-10-06	Skeleton nv drm driver, to enable DMA in EXA. (Lars Knoll, minor updates by	Adam Jackson
2005-10-06	remove version not used anymore	Dave Airlie
2005-09-30	fix header this is now a c file	Dave Airlie
2005-09-30	Add support to turn writeback off via radeon module option	Dave Airlie
2005-09-30	fixup bens fix so it works..	Dave Airlie
2005-09-30	Add Bens fix for radeon maps on ppc	Dave Airlie
2005-09-25	via: fix stray error printout message.	Thomas Hellstrom
2005-09-25	Add the via PCI DMA blit code.	Thomas Hellstrom
2005-09-25	add __ATTR	Dave Airlie
2005-09-25	use linux kernel macros don't make our own	Dave Airlie

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generated by cgit v1.2.3 (git 2.25.1) at 2025-08-28 04:31:19 +0000

/**
 * \file drm_context.c
 * IOCTLs for generic contexts
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * 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 <duwe@caldera.de>
 *		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::ctx_idr, while holding the drm_device::struct_mutex
 * lock.
 */
void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle)
{
	struct drm_ctx_sarea_list *ctx;

	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;
}

/**
 * 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_ctxbitmap_next(drm_device_t * dev)
{
	int new_id;
	int ret;
	struct drm_ctx_sarea_list *new_ctx;

	new_ctx = drm_calloc(1, sizeof(struct drm_ctx_sarea_list), DRM_MEM_CTXLIST);
	if (!new_ctx)
		return -1;

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;
	}
	
	mutex_unlock(&dev->struct_mutex);
	return new_id;
}

/**
 * Context bitmap initialization.
 *
 * \param dev DRM device.
 *
 * Initialise the drm_device::ctx_idr
 */
int drm_ctxbitmap_init(drm_device_t * dev)
{
	idr_init(&dev->ctx_idr);
	return 0;
}



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);
	return 0;
}

/**
 * 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_ctxbitmap_cleanup(drm_device_t * dev)
{
	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);
}

/*@}*/

/******************************************************************/
/** \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::ctx_idr 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;
	struct drm_ctx_sarea_list *ctx_sarea;

	if (copy_from_user(&request, argp, sizeof(request)))
		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);
		return -EINVAL;
	}
	map = ctx_sarea->map;

	mutex_unlock(&dev->struct_mutex);

	request.handle = NULL;
	list_for_each_entry(_entry, &dev->maplist, head) {
		if (_entry->map == map) {
			request.handle = 
			    (void *)(unsigned long)_entry->user_token;
			break;
		}
	}
	if (request.handle == NULL)
		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::ctx_idr 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 drm_ctx_sarea_list *ctx_sarea;

	if (copy_from_user(&request,
			   (drm_ctx_priv_map_t __user *) arg, sizeof(request)))
		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;
	}
      bad:
	mutex_unlock(&dev->struct_mutex);
	return -EINVAL;

      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);
	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.
 */
static 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)
			if (!dev->driver->context_ctor(dev, ctx.handle)) {
				DRM_DEBUG("Running out of ctxs or memory.\n");
				return -ENOMEM;
			}
	}

	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);

	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);
	}

	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);

	return 0;
}

/*@}*/