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493 lines
13 KiB
C
493 lines
13 KiB
C
![]() |
/* drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
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* Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.com
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*
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rickard E. (Rik) Faith <faith@valinux.com>
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* Gareth Hughes <gareth@valinux.com>
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* ChangeLog:
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* 2001-11-16 Torsten Duwe <duwe@caldera.de>
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* added context constructor/destructor hooks,
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* needed by SiS driver's memory management.
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*/
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/* ================================================================
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* Old-style context support -- only used by gamma.
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*/
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/* The drm_read and drm_write_string code (especially that which manages
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the circular buffer), is based on Alessandro Rubini's LINUX DEVICE
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DRIVERS (Cambridge: O'Reilly, 1998), pages 111-113. */
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ssize_t gamma_fops_read(struct file *filp, char __user *buf, size_t count, loff_t *off)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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int left;
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int avail;
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int send;
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int cur;
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DRM_DEBUG("%p, %p\n", dev->buf_rp, dev->buf_wp);
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while (dev->buf_rp == dev->buf_wp) {
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DRM_DEBUG(" sleeping\n");
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if (filp->f_flags & O_NONBLOCK) {
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return -EAGAIN;
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}
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interruptible_sleep_on(&dev->buf_readers);
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if (signal_pending(current)) {
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DRM_DEBUG(" interrupted\n");
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return -ERESTARTSYS;
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}
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DRM_DEBUG(" awake\n");
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}
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left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
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avail = DRM_BSZ - left;
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send = DRM_MIN(avail, count);
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while (send) {
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if (dev->buf_wp > dev->buf_rp) {
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cur = DRM_MIN(send, dev->buf_wp - dev->buf_rp);
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} else {
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cur = DRM_MIN(send, dev->buf_end - dev->buf_rp);
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}
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if (copy_to_user(buf, dev->buf_rp, cur))
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return -EFAULT;
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dev->buf_rp += cur;
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if (dev->buf_rp == dev->buf_end) dev->buf_rp = dev->buf;
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send -= cur;
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}
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wake_up_interruptible(&dev->buf_writers);
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return DRM_MIN(avail, count);
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}
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/* In an incredibly convoluted setup, the kernel module actually calls
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* back into the X server to perform context switches on behalf of the
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* 3d clients.
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*/
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int DRM(write_string)(drm_device_t *dev, const char *s)
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{
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int left = (dev->buf_rp + DRM_BSZ - dev->buf_wp) % DRM_BSZ;
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int send = strlen(s);
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int count;
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DRM_DEBUG("%d left, %d to send (%p, %p)\n",
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left, send, dev->buf_rp, dev->buf_wp);
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if (left == 1 || dev->buf_wp != dev->buf_rp) {
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DRM_ERROR("Buffer not empty (%d left, wp = %p, rp = %p)\n",
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left,
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dev->buf_wp,
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dev->buf_rp);
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}
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while (send) {
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if (dev->buf_wp >= dev->buf_rp) {
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count = DRM_MIN(send, dev->buf_end - dev->buf_wp);
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if (count == left) --count; /* Leave a hole */
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} else {
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count = DRM_MIN(send, dev->buf_rp - dev->buf_wp - 1);
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}
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strncpy(dev->buf_wp, s, count);
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dev->buf_wp += count;
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if (dev->buf_wp == dev->buf_end) dev->buf_wp = dev->buf;
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send -= count;
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}
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if (dev->buf_async) kill_fasync(&dev->buf_async, SIGIO, POLL_IN);
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DRM_DEBUG("waking\n");
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wake_up_interruptible(&dev->buf_readers);
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return 0;
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}
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unsigned int gamma_fops_poll(struct file *filp, struct poll_table_struct *wait)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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poll_wait(filp, &dev->buf_readers, wait);
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if (dev->buf_wp != dev->buf_rp) return POLLIN | POLLRDNORM;
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return 0;
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}
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int DRM(context_switch)(drm_device_t *dev, int old, int new)
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{
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char buf[64];
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drm_queue_t *q;
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if (test_and_set_bit(0, &dev->context_flag)) {
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DRM_ERROR("Reentering -- FIXME\n");
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return -EBUSY;
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}
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DRM_DEBUG("Context switch from %d to %d\n", old, new);
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if (new >= dev->queue_count) {
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clear_bit(0, &dev->context_flag);
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return -EINVAL;
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}
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if (new == dev->last_context) {
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clear_bit(0, &dev->context_flag);
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return 0;
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}
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q = dev->queuelist[new];
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atomic_inc(&q->use_count);
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if (atomic_read(&q->use_count) == 1) {
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atomic_dec(&q->use_count);
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clear_bit(0, &dev->context_flag);
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return -EINVAL;
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}
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/* This causes the X server to wake up & do a bunch of hardware
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* interaction to actually effect the context switch.
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*/
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sprintf(buf, "C %d %d\n", old, new);
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DRM(write_string)(dev, buf);
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atomic_dec(&q->use_count);
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return 0;
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}
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int DRM(context_switch_complete)(drm_device_t *dev, int new)
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{
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drm_device_dma_t *dma = dev->dma;
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dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
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dev->last_switch = jiffies;
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if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
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DRM_ERROR("Lock isn't held after context switch\n");
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}
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if (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) {
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if (DRM(lock_free)(dev, &dev->lock.hw_lock->lock,
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DRM_KERNEL_CONTEXT)) {
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DRM_ERROR("Cannot free lock\n");
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}
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}
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clear_bit(0, &dev->context_flag);
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wake_up_interruptible(&dev->context_wait);
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return 0;
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}
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static int DRM(init_queue)(drm_device_t *dev, drm_queue_t *q, drm_ctx_t *ctx)
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{
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DRM_DEBUG("\n");
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if (atomic_read(&q->use_count) != 1
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|| atomic_read(&q->finalization)
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|| atomic_read(&q->block_count)) {
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DRM_ERROR("New queue is already in use: u%d f%d b%d\n",
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atomic_read(&q->use_count),
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atomic_read(&q->finalization),
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atomic_read(&q->block_count));
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}
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atomic_set(&q->finalization, 0);
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atomic_set(&q->block_count, 0);
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atomic_set(&q->block_read, 0);
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atomic_set(&q->block_write, 0);
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atomic_set(&q->total_queued, 0);
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atomic_set(&q->total_flushed, 0);
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atomic_set(&q->total_locks, 0);
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init_waitqueue_head(&q->write_queue);
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init_waitqueue_head(&q->read_queue);
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init_waitqueue_head(&q->flush_queue);
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q->flags = ctx->flags;
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DRM(waitlist_create)(&q->waitlist, dev->dma->buf_count);
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return 0;
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}
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/* drm_alloc_queue:
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PRE: 1) dev->queuelist[0..dev->queue_count] is allocated and will not
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disappear (so all deallocation must be done after IOCTLs are off)
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2) dev->queue_count < dev->queue_slots
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3) dev->queuelist[i].use_count == 0 and
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dev->queuelist[i].finalization == 0 if i not in use
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POST: 1) dev->queuelist[i].use_count == 1
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2) dev->queue_count < dev->queue_slots */
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static int DRM(alloc_queue)(drm_device_t *dev)
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{
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int i;
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drm_queue_t *queue;
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int oldslots;
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int newslots;
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/* Check for a free queue */
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for (i = 0; i < dev->queue_count; i++) {
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atomic_inc(&dev->queuelist[i]->use_count);
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if (atomic_read(&dev->queuelist[i]->use_count) == 1
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&& !atomic_read(&dev->queuelist[i]->finalization)) {
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DRM_DEBUG("%d (free)\n", i);
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return i;
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}
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atomic_dec(&dev->queuelist[i]->use_count);
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}
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/* Allocate a new queue */
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down(&dev->struct_sem);
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queue = DRM(alloc)(sizeof(*queue), DRM_MEM_QUEUES);
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memset(queue, 0, sizeof(*queue));
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atomic_set(&queue->use_count, 1);
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++dev->queue_count;
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if (dev->queue_count >= dev->queue_slots) {
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oldslots = dev->queue_slots * sizeof(*dev->queuelist);
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if (!dev->queue_slots) dev->queue_slots = 1;
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dev->queue_slots *= 2;
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newslots = dev->queue_slots * sizeof(*dev->queuelist);
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dev->queuelist = DRM(realloc)(dev->queuelist,
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oldslots,
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newslots,
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DRM_MEM_QUEUES);
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if (!dev->queuelist) {
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up(&dev->struct_sem);
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DRM_DEBUG("out of memory\n");
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return -ENOMEM;
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}
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}
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dev->queuelist[dev->queue_count-1] = queue;
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up(&dev->struct_sem);
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DRM_DEBUG("%d (new)\n", dev->queue_count - 1);
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return dev->queue_count - 1;
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}
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int DRM(resctx)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_ctx_res_t __user *argp = (void __user *)arg;
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drm_ctx_res_t res;
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drm_ctx_t ctx;
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int i;
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DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
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if (copy_from_user(&res, argp, sizeof(res)))
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return -EFAULT;
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if (res.count >= DRM_RESERVED_CONTEXTS) {
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memset(&ctx, 0, sizeof(ctx));
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for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
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ctx.handle = i;
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if (copy_to_user(&res.contexts[i],
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&i,
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sizeof(i)))
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return -EFAULT;
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}
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}
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res.count = DRM_RESERVED_CONTEXTS;
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if (copy_to_user(argp, &res, sizeof(res)))
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return -EFAULT;
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return 0;
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}
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int DRM(addctx)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_ctx_t ctx;
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drm_ctx_t __user *argp = (void __user *)arg;
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if (copy_from_user(&ctx, argp, sizeof(ctx)))
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return -EFAULT;
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if ((ctx.handle = DRM(alloc_queue)(dev)) == DRM_KERNEL_CONTEXT) {
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/* Init kernel's context and get a new one. */
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DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
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ctx.handle = DRM(alloc_queue)(dev);
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}
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DRM(init_queue)(dev, dev->queuelist[ctx.handle], &ctx);
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DRM_DEBUG("%d\n", ctx.handle);
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if (copy_to_user(argp, &ctx, sizeof(ctx)))
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return -EFAULT;
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return 0;
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}
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int DRM(modctx)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_ctx_t ctx;
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drm_queue_t *q;
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if (copy_from_user(&ctx, (drm_ctx_t __user *)arg, sizeof(ctx)))
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return -EFAULT;
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DRM_DEBUG("%d\n", ctx.handle);
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if (ctx.handle < 0 || ctx.handle >= dev->queue_count) return -EINVAL;
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q = dev->queuelist[ctx.handle];
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atomic_inc(&q->use_count);
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if (atomic_read(&q->use_count) == 1) {
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/* No longer in use */
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atomic_dec(&q->use_count);
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return -EINVAL;
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}
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if (DRM_BUFCOUNT(&q->waitlist)) {
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atomic_dec(&q->use_count);
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return -EBUSY;
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}
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q->flags = ctx.flags;
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atomic_dec(&q->use_count);
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return 0;
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}
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int DRM(getctx)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_ctx_t __user *argp = (void __user *)arg;
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drm_ctx_t ctx;
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drm_queue_t *q;
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if (copy_from_user(&ctx, argp, sizeof(ctx)))
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return -EFAULT;
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DRM_DEBUG("%d\n", ctx.handle);
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if (ctx.handle >= dev->queue_count) return -EINVAL;
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q = dev->queuelist[ctx.handle];
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atomic_inc(&q->use_count);
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if (atomic_read(&q->use_count) == 1) {
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/* No longer in use */
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atomic_dec(&q->use_count);
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return -EINVAL;
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}
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ctx.flags = q->flags;
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atomic_dec(&q->use_count);
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if (copy_to_user(argp, &ctx, sizeof(ctx)))
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return -EFAULT;
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return 0;
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}
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int DRM(switchctx)(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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drm_file_t *priv = filp->private_data;
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drm_device_t *dev = priv->dev;
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drm_ctx_t ctx;
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|
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);
|
||
|
}
|
||
|
|
||
|
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->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;
|
||
|
}
|
||
|
|
||
|
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->dev;
|
||
|
drm_ctx_t ctx;
|
||
|
drm_queue_t *q;
|
||
|
drm_buf_t *buf;
|
||
|
|
||
|
if (copy_from_user(&ctx, (drm_ctx_t __user *)arg, sizeof(ctx)))
|
||
|
return -EFAULT;
|
||
|
DRM_DEBUG("%d\n", ctx.handle);
|
||
|
|
||
|
if (ctx.handle >= dev->queue_count) return -EINVAL;
|
||
|
q = dev->queuelist[ctx.handle];
|
||
|
|
||
|
atomic_inc(&q->use_count);
|
||
|
if (atomic_read(&q->use_count) == 1) {
|
||
|
/* No longer in use */
|
||
|
atomic_dec(&q->use_count);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
atomic_inc(&q->finalization); /* Mark queue in finalization state */
|
||
|
atomic_sub(2, &q->use_count); /* Mark queue as unused (pending
|
||
|
finalization) */
|
||
|
|
||
|
while (test_and_set_bit(0, &dev->interrupt_flag)) {
|
||
|
schedule();
|
||
|
if (signal_pending(current)) {
|
||
|
clear_bit(0, &dev->interrupt_flag);
|
||
|
return -EINTR;
|
||
|
}
|
||
|
}
|
||
|
/* Remove queued buffers */
|
||
|
while ((buf = DRM(waitlist_get)(&q->waitlist))) {
|
||
|
DRM(free_buffer)(dev, buf);
|
||
|
}
|
||
|
clear_bit(0, &dev->interrupt_flag);
|
||
|
|
||
|
/* Wakeup blocked processes */
|
||
|
wake_up_interruptible(&q->read_queue);
|
||
|
wake_up_interruptible(&q->write_queue);
|
||
|
wake_up_interruptible(&q->flush_queue);
|
||
|
|
||
|
/* Finalization over. Queue is made
|
||
|
available when both use_count and
|
||
|
finalization become 0, which won't
|
||
|
happen until all the waiting processes
|
||
|
stop waiting. */
|
||
|
atomic_dec(&q->finalization);
|
||
|
return 0;
|
||
|
}
|
||
|
|