gamma_dma.c
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上传日期:2013-02-24
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- /* gamma_dma.c -- DMA support for GMX 2000 -*- linux-c -*-
- * Created: Fri Mar 19 14:30:16 1999 by faith@precisioninsight.com
- *
- * Copyright 1999 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
- * PRECISION INSIGHT 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.
- *
- * Authors:
- * Rickard E. (Rik) Faith <faith@valinux.com>
- *
- */
- #define __NO_VERSION__
- #include "drmP.h"
- #include "gamma_drv.h"
- #include <linux/interrupt.h> /* For task queue support */
- /* WARNING!!! MAGIC NUMBER!!! The number of regions already added to the
- kernel must be specified here. Currently, the number is 2. This must
- match the order the X server uses for instantiating register regions ,
- or must be passed in a new ioctl. */
- #define GAMMA_REG(reg)
- (2
- + ((reg < 0x1000)
- ? 0
- : ((reg < 0x10000) ? 1 : ((reg < 0x11000) ? 2 : 3))))
- #define GAMMA_OFF(reg)
- ((reg < 0x1000)
- ? reg
- : ((reg < 0x10000)
- ? (reg - 0x1000)
- : ((reg < 0x11000)
- ? (reg - 0x10000)
- : (reg - 0x11000))))
- #define GAMMA_BASE(reg) ((unsigned long)dev->maplist[GAMMA_REG(reg)]->handle)
- #define GAMMA_ADDR(reg) (GAMMA_BASE(reg) + GAMMA_OFF(reg))
- #define GAMMA_DEREF(reg) *(__volatile__ int *)GAMMA_ADDR(reg)
- #define GAMMA_READ(reg) GAMMA_DEREF(reg)
- #define GAMMA_WRITE(reg,val) do { GAMMA_DEREF(reg) = val; } while (0)
- #define GAMMA_BROADCASTMASK 0x9378
- #define GAMMA_COMMANDINTENABLE 0x0c48
- #define GAMMA_DMAADDRESS 0x0028
- #define GAMMA_DMACOUNT 0x0030
- #define GAMMA_FILTERMODE 0x8c00
- #define GAMMA_GCOMMANDINTFLAGS 0x0c50
- #define GAMMA_GCOMMANDMODE 0x0c40
- #define GAMMA_GCOMMANDSTATUS 0x0c60
- #define GAMMA_GDELAYTIMER 0x0c38
- #define GAMMA_GDMACONTROL 0x0060
- #define GAMMA_GINTENABLE 0x0808
- #define GAMMA_GINTFLAGS 0x0810
- #define GAMMA_INFIFOSPACE 0x0018
- #define GAMMA_OUTFIFOWORDS 0x0020
- #define GAMMA_OUTPUTFIFO 0x2000
- #define GAMMA_SYNC 0x8c40
- #define GAMMA_SYNC_TAG 0x0188
- static inline void gamma_dma_dispatch(drm_device_t *dev, unsigned long address,
- unsigned long length)
- {
- GAMMA_WRITE(GAMMA_DMAADDRESS, virt_to_phys((void *)address));
- while (GAMMA_READ(GAMMA_GCOMMANDSTATUS) != 4)
- ;
- GAMMA_WRITE(GAMMA_DMACOUNT, length / 4);
- }
- static inline void gamma_dma_quiescent_single(drm_device_t *dev)
- {
- while (GAMMA_READ(GAMMA_DMACOUNT))
- ;
- while (GAMMA_READ(GAMMA_INFIFOSPACE) < 3)
- ;
- GAMMA_WRITE(GAMMA_FILTERMODE, 1 << 10);
- GAMMA_WRITE(GAMMA_SYNC, 0);
-
- do {
- while (!GAMMA_READ(GAMMA_OUTFIFOWORDS))
- ;
- } while (GAMMA_READ(GAMMA_OUTPUTFIFO) != GAMMA_SYNC_TAG);
- }
- static inline void gamma_dma_quiescent_dual(drm_device_t *dev)
- {
- while (GAMMA_READ(GAMMA_DMACOUNT))
- ;
- while (GAMMA_READ(GAMMA_INFIFOSPACE) < 3)
- ;
- GAMMA_WRITE(GAMMA_BROADCASTMASK, 3);
- GAMMA_WRITE(GAMMA_FILTERMODE, 1 << 10);
- GAMMA_WRITE(GAMMA_SYNC, 0);
-
- /* Read from first MX */
- do {
- while (!GAMMA_READ(GAMMA_OUTFIFOWORDS))
- ;
- } while (GAMMA_READ(GAMMA_OUTPUTFIFO) != GAMMA_SYNC_TAG);
-
- /* Read from second MX */
- do {
- while (!GAMMA_READ(GAMMA_OUTFIFOWORDS + 0x10000))
- ;
- } while (GAMMA_READ(GAMMA_OUTPUTFIFO + 0x10000) != GAMMA_SYNC_TAG);
- }
- static inline void gamma_dma_ready(drm_device_t *dev)
- {
- while (GAMMA_READ(GAMMA_DMACOUNT))
- ;
- }
- static inline int gamma_dma_is_ready(drm_device_t *dev)
- {
- return !GAMMA_READ(GAMMA_DMACOUNT);
- }
- static void gamma_dma_service(int irq, void *device, struct pt_regs *regs)
- {
- drm_device_t *dev = (drm_device_t *)device;
- drm_device_dma_t *dma = dev->dma;
-
- atomic_inc(&dev->total_irq);
- GAMMA_WRITE(GAMMA_GDELAYTIMER, 0xc350/2); /* 0x05S */
- GAMMA_WRITE(GAMMA_GCOMMANDINTFLAGS, 8);
- GAMMA_WRITE(GAMMA_GINTFLAGS, 0x2001);
- if (gamma_dma_is_ready(dev)) {
- /* Free previous buffer */
- if (test_and_set_bit(0, &dev->dma_flag)) {
- atomic_inc(&dma->total_missed_free);
- return;
- }
- if (dma->this_buffer) {
- drm_free_buffer(dev, dma->this_buffer);
- dma->this_buffer = NULL;
- }
- clear_bit(0, &dev->dma_flag);
- /* Dispatch new buffer */
- queue_task(&dev->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
- }
- }
- /* Only called by gamma_dma_schedule. */
- static int gamma_do_dma(drm_device_t *dev, int locked)
- {
- unsigned long address;
- unsigned long length;
- drm_buf_t *buf;
- int retcode = 0;
- drm_device_dma_t *dma = dev->dma;
- #if DRM_DMA_HISTOGRAM
- cycles_t dma_start, dma_stop;
- #endif
- if (test_and_set_bit(0, &dev->dma_flag)) {
- atomic_inc(&dma->total_missed_dma);
- return -EBUSY;
- }
-
- #if DRM_DMA_HISTOGRAM
- dma_start = get_cycles();
- #endif
- if (!dma->next_buffer) {
- DRM_ERROR("No next_buffern");
- clear_bit(0, &dev->dma_flag);
- return -EINVAL;
- }
- buf = dma->next_buffer;
- address = (unsigned long)buf->address;
- length = buf->used;
- DRM_DEBUG("context %d, buffer %d (%ld bytes)n",
- buf->context, buf->idx, length);
- if (buf->list == DRM_LIST_RECLAIM) {
- drm_clear_next_buffer(dev);
- drm_free_buffer(dev, buf);
- clear_bit(0, &dev->dma_flag);
- return -EINVAL;
- }
- if (!length) {
- DRM_ERROR("0 length buffern");
- drm_clear_next_buffer(dev);
- drm_free_buffer(dev, buf);
- clear_bit(0, &dev->dma_flag);
- return 0;
- }
-
- if (!gamma_dma_is_ready(dev)) {
- clear_bit(0, &dev->dma_flag);
- return -EBUSY;
- }
- if (buf->while_locked) {
- if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
- DRM_ERROR("Dispatching buffer %d from pid %d"
- " "while locked", but no lock heldn",
- buf->idx, buf->pid);
- }
- } else {
- if (!locked && !drm_lock_take(&dev->lock.hw_lock->lock,
- DRM_KERNEL_CONTEXT)) {
- atomic_inc(&dma->total_missed_lock);
- clear_bit(0, &dev->dma_flag);
- return -EBUSY;
- }
- }
- if (dev->last_context != buf->context
- && !(dev->queuelist[buf->context]->flags
- & _DRM_CONTEXT_PRESERVED)) {
- /* PRE: dev->last_context != buf->context */
- if (drm_context_switch(dev, dev->last_context, buf->context)) {
- drm_clear_next_buffer(dev);
- drm_free_buffer(dev, buf);
- }
- retcode = -EBUSY;
- goto cleanup;
-
- /* POST: we will wait for the context
- switch and will dispatch on a later call
- when dev->last_context == buf->context.
- NOTE WE HOLD THE LOCK THROUGHOUT THIS
- TIME! */
- }
- drm_clear_next_buffer(dev);
- buf->pending = 1;
- buf->waiting = 0;
- buf->list = DRM_LIST_PEND;
- #if DRM_DMA_HISTOGRAM
- buf->time_dispatched = get_cycles();
- #endif
- gamma_dma_dispatch(dev, address, length);
- drm_free_buffer(dev, dma->this_buffer);
- dma->this_buffer = buf;
- atomic_add(length, &dma->total_bytes);
- atomic_inc(&dma->total_dmas);
- if (!buf->while_locked && !dev->context_flag && !locked) {
- if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
- DRM_KERNEL_CONTEXT)) {
- DRM_ERROR("n");
- }
- }
- cleanup:
- clear_bit(0, &dev->dma_flag);
- #if DRM_DMA_HISTOGRAM
- dma_stop = get_cycles();
- atomic_inc(&dev->histo.dma[drm_histogram_slot(dma_stop - dma_start)]);
- #endif
- return retcode;
- }
- static void gamma_dma_schedule_timer_wrapper(unsigned long dev)
- {
- gamma_dma_schedule((drm_device_t *)dev, 0);
- }
- static void gamma_dma_schedule_tq_wrapper(void *dev)
- {
- gamma_dma_schedule(dev, 0);
- }
- int gamma_dma_schedule(drm_device_t *dev, int locked)
- {
- int next;
- drm_queue_t *q;
- drm_buf_t *buf;
- int retcode = 0;
- int processed = 0;
- int missed;
- int expire = 20;
- drm_device_dma_t *dma = dev->dma;
- #if DRM_DMA_HISTOGRAM
- cycles_t schedule_start;
- #endif
- if (test_and_set_bit(0, &dev->interrupt_flag)) {
- /* Not reentrant */
- atomic_inc(&dma->total_missed_sched);
- return -EBUSY;
- }
- missed = atomic_read(&dma->total_missed_sched);
- #if DRM_DMA_HISTOGRAM
- schedule_start = get_cycles();
- #endif
- again:
- if (dev->context_flag) {
- clear_bit(0, &dev->interrupt_flag);
- return -EBUSY;
- }
- if (dma->next_buffer) {
- /* Unsent buffer that was previously
- selected, but that couldn't be sent
- because the lock could not be obtained
- or the DMA engine wasn't ready. Try
- again. */
- atomic_inc(&dma->total_tried);
- if (!(retcode = gamma_do_dma(dev, locked))) {
- atomic_inc(&dma->total_hit);
- ++processed;
- }
- } else {
- do {
- next = drm_select_queue(dev,
- gamma_dma_schedule_timer_wrapper);
- if (next >= 0) {
- q = dev->queuelist[next];
- buf = drm_waitlist_get(&q->waitlist);
- dma->next_buffer = buf;
- dma->next_queue = q;
- if (buf && buf->list == DRM_LIST_RECLAIM) {
- drm_clear_next_buffer(dev);
- drm_free_buffer(dev, buf);
- }
- }
- } while (next >= 0 && !dma->next_buffer);
- if (dma->next_buffer) {
- if (!(retcode = gamma_do_dma(dev, locked))) {
- ++processed;
- }
- }
- }
- if (--expire) {
- if (missed != atomic_read(&dma->total_missed_sched)) {
- atomic_inc(&dma->total_lost);
- if (gamma_dma_is_ready(dev)) goto again;
- }
- if (processed && gamma_dma_is_ready(dev)) {
- atomic_inc(&dma->total_lost);
- processed = 0;
- goto again;
- }
- }
-
- clear_bit(0, &dev->interrupt_flag);
-
- #if DRM_DMA_HISTOGRAM
- atomic_inc(&dev->histo.schedule[drm_histogram_slot(get_cycles()
- - schedule_start)]);
- #endif
- return retcode;
- }
- static int gamma_dma_priority(drm_device_t *dev, drm_dma_t *d)
- {
- unsigned long address;
- unsigned long length;
- int must_free = 0;
- int retcode = 0;
- int i;
- int idx;
- drm_buf_t *buf;
- drm_buf_t *last_buf = NULL;
- drm_device_dma_t *dma = dev->dma;
- DECLARE_WAITQUEUE(entry, current);
- /* Turn off interrupt handling */
- while (test_and_set_bit(0, &dev->interrupt_flag)) {
- schedule();
- if (signal_pending(current)) return -EINTR;
- }
- if (!(d->flags & _DRM_DMA_WHILE_LOCKED)) {
- while (!drm_lock_take(&dev->lock.hw_lock->lock,
- DRM_KERNEL_CONTEXT)) {
- schedule();
- if (signal_pending(current)) {
- clear_bit(0, &dev->interrupt_flag);
- return -EINTR;
- }
- }
- ++must_free;
- }
- atomic_inc(&dma->total_prio);
- for (i = 0; i < d->send_count; i++) {
- idx = d->send_indices[i];
- if (idx < 0 || idx >= dma->buf_count) {
- DRM_ERROR("Index %d (of %d max)n",
- d->send_indices[i], dma->buf_count - 1);
- continue;
- }
- buf = dma->buflist[ idx ];
- if (buf->pid != current->pid) {
- DRM_ERROR("Process %d using buffer owned by %dn",
- current->pid, buf->pid);
- retcode = -EINVAL;
- goto cleanup;
- }
- if (buf->list != DRM_LIST_NONE) {
- DRM_ERROR("Process %d using %d's buffer on list %dn",
- current->pid, buf->pid, buf->list);
- retcode = -EINVAL;
- goto cleanup;
- }
- /* This isn't a race condition on
- buf->list, since our concern is the
- buffer reclaim during the time the
- process closes the /dev/drm? handle, so
- it can't also be doing DMA. */
- buf->list = DRM_LIST_PRIO;
- buf->used = d->send_sizes[i];
- buf->context = d->context;
- buf->while_locked = d->flags & _DRM_DMA_WHILE_LOCKED;
- address = (unsigned long)buf->address;
- length = buf->used;
- if (!length) {
- DRM_ERROR("0 length buffern");
- }
- if (buf->pending) {
- DRM_ERROR("Sending pending buffer:"
- " buffer %d, offset %dn",
- d->send_indices[i], i);
- retcode = -EINVAL;
- goto cleanup;
- }
- if (buf->waiting) {
- DRM_ERROR("Sending waiting buffer:"
- " buffer %d, offset %dn",
- d->send_indices[i], i);
- retcode = -EINVAL;
- goto cleanup;
- }
- buf->pending = 1;
-
- if (dev->last_context != buf->context
- && !(dev->queuelist[buf->context]->flags
- & _DRM_CONTEXT_PRESERVED)) {
- add_wait_queue(&dev->context_wait, &entry);
- current->state = TASK_INTERRUPTIBLE;
- /* PRE: dev->last_context != buf->context */
- drm_context_switch(dev, dev->last_context,
- buf->context);
- /* POST: we will wait for the context
- switch and will dispatch on a later call
- when dev->last_context == buf->context.
- NOTE WE HOLD THE LOCK THROUGHOUT THIS
- TIME! */
- schedule();
- current->state = TASK_RUNNING;
- remove_wait_queue(&dev->context_wait, &entry);
- if (signal_pending(current)) {
- retcode = -EINTR;
- goto cleanup;
- }
- if (dev->last_context != buf->context) {
- DRM_ERROR("Context mismatch: %d %dn",
- dev->last_context,
- buf->context);
- }
- }
- #if DRM_DMA_HISTOGRAM
- buf->time_queued = get_cycles();
- buf->time_dispatched = buf->time_queued;
- #endif
- gamma_dma_dispatch(dev, address, length);
- atomic_add(length, &dma->total_bytes);
- atomic_inc(&dma->total_dmas);
-
- if (last_buf) {
- drm_free_buffer(dev, last_buf);
- }
- last_buf = buf;
- }
- cleanup:
- if (last_buf) {
- gamma_dma_ready(dev);
- drm_free_buffer(dev, last_buf);
- }
-
- if (must_free && !dev->context_flag) {
- if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
- DRM_KERNEL_CONTEXT)) {
- DRM_ERROR("n");
- }
- }
- clear_bit(0, &dev->interrupt_flag);
- return retcode;
- }
- static int gamma_dma_send_buffers(drm_device_t *dev, drm_dma_t *d)
- {
- DECLARE_WAITQUEUE(entry, current);
- drm_buf_t *last_buf = NULL;
- int retcode = 0;
- drm_device_dma_t *dma = dev->dma;
- if (d->flags & _DRM_DMA_BLOCK) {
- last_buf = dma->buflist[d->send_indices[d->send_count-1]];
- add_wait_queue(&last_buf->dma_wait, &entry);
- }
-
- if ((retcode = drm_dma_enqueue(dev, d))) {
- if (d->flags & _DRM_DMA_BLOCK)
- remove_wait_queue(&last_buf->dma_wait, &entry);
- return retcode;
- }
-
- gamma_dma_schedule(dev, 0);
-
- if (d->flags & _DRM_DMA_BLOCK) {
- DRM_DEBUG("%d waitingn", current->pid);
- for (;;) {
- current->state = TASK_INTERRUPTIBLE;
- if (!last_buf->waiting && !last_buf->pending)
- break; /* finished */
- schedule();
- if (signal_pending(current)) {
- retcode = -EINTR; /* Can't restart */
- break;
- }
- }
- current->state = TASK_RUNNING;
- DRM_DEBUG("%d runningn", current->pid);
- remove_wait_queue(&last_buf->dma_wait, &entry);
- if (!retcode
- || (last_buf->list==DRM_LIST_PEND && !last_buf->pending)) {
- if (!waitqueue_active(&last_buf->dma_wait)) {
- drm_free_buffer(dev, last_buf);
- }
- }
- if (retcode) {
- DRM_ERROR("ctx%d w%d p%d c%d i%d l%d %d/%dn",
- d->context,
- last_buf->waiting,
- last_buf->pending,
- DRM_WAITCOUNT(dev, d->context),
- last_buf->idx,
- last_buf->list,
- last_buf->pid,
- current->pid);
- }
- }
- return retcode;
- }
- int gamma_dma(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_device_dma_t *dma = dev->dma;
- int retcode = 0;
- drm_dma_t d;
- if (copy_from_user(&d, (drm_dma_t *)arg, sizeof(d)))
- return -EFAULT;
- DRM_DEBUG("%d %d: %d send, %d reqn",
- current->pid, d.context, d.send_count, d.request_count);
- if (d.context == DRM_KERNEL_CONTEXT || d.context >= dev->queue_slots) {
- DRM_ERROR("Process %d using context %dn",
- current->pid, d.context);
- return -EINVAL;
- }
- if (d.send_count < 0 || d.send_count > dma->buf_count) {
- DRM_ERROR("Process %d trying to send %d buffers (of %d max)n",
- current->pid, d.send_count, dma->buf_count);
- return -EINVAL;
- }
- if (d.request_count < 0 || d.request_count > dma->buf_count) {
- DRM_ERROR("Process %d trying to get %d buffers (of %d max)n",
- current->pid, d.request_count, dma->buf_count);
- return -EINVAL;
- }
- if (d.send_count) {
- if (d.flags & _DRM_DMA_PRIORITY)
- retcode = gamma_dma_priority(dev, &d);
- else
- retcode = gamma_dma_send_buffers(dev, &d);
- }
- d.granted_count = 0;
- if (!retcode && d.request_count) {
- retcode = drm_dma_get_buffers(dev, &d);
- }
- DRM_DEBUG("%d returning, granted = %dn",
- current->pid, d.granted_count);
- if (copy_to_user((drm_dma_t *)arg, &d, sizeof(d)))
- return -EFAULT;
- return retcode;
- }
- int gamma_irq_install(drm_device_t *dev, int irq)
- {
- int retcode;
- if (!irq) return -EINVAL;
-
- down(&dev->struct_sem);
- if (dev->irq) {
- up(&dev->struct_sem);
- return -EBUSY;
- }
- dev->irq = irq;
- up(&dev->struct_sem);
-
- DRM_DEBUG("%dn", irq);
- dev->context_flag = 0;
- dev->interrupt_flag = 0;
- dev->dma_flag = 0;
-
- dev->dma->next_buffer = NULL;
- dev->dma->next_queue = NULL;
- dev->dma->this_buffer = NULL;
- INIT_LIST_HEAD(&dev->tq.list);
- dev->tq.sync = 0;
- dev->tq.routine = gamma_dma_schedule_tq_wrapper;
- dev->tq.data = dev;
- /* Before installing handler */
- GAMMA_WRITE(GAMMA_GCOMMANDMODE, 0);
- GAMMA_WRITE(GAMMA_GDMACONTROL, 0);
-
- /* Install handler */
- if ((retcode = request_irq(dev->irq,
- gamma_dma_service,
- 0,
- dev->devname,
- dev))) {
- down(&dev->struct_sem);
- dev->irq = 0;
- up(&dev->struct_sem);
- return retcode;
- }
- /* After installing handler */
- GAMMA_WRITE(GAMMA_GINTENABLE, 0x2001);
- GAMMA_WRITE(GAMMA_COMMANDINTENABLE, 0x0008);
- GAMMA_WRITE(GAMMA_GDELAYTIMER, 0x39090);
-
- return 0;
- }
- int gamma_irq_uninstall(drm_device_t *dev)
- {
- int irq;
- down(&dev->struct_sem);
- irq = dev->irq;
- dev->irq = 0;
- up(&dev->struct_sem);
-
- if (!irq) return -EINVAL;
-
- DRM_DEBUG("%dn", irq);
-
- GAMMA_WRITE(GAMMA_GDELAYTIMER, 0);
- GAMMA_WRITE(GAMMA_COMMANDINTENABLE, 0);
- GAMMA_WRITE(GAMMA_GINTENABLE, 0);
- free_irq(irq, dev);
- return 0;
- }
- int gamma_control(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_control_t ctl;
- int retcode;
-
- if (copy_from_user(&ctl, (drm_control_t *)arg, sizeof(ctl)))
- return -EFAULT;
-
- switch (ctl.func) {
- case DRM_INST_HANDLER:
- if ((retcode = gamma_irq_install(dev, ctl.irq)))
- return retcode;
- break;
- case DRM_UNINST_HANDLER:
- if ((retcode = gamma_irq_uninstall(dev)))
- return retcode;
- break;
- default:
- return -EINVAL;
- }
- return 0;
- }
- int gamma_lock(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;
- DECLARE_WAITQUEUE(entry, current);
- int ret = 0;
- drm_lock_t lock;
- drm_queue_t *q;
- #if DRM_DMA_HISTOGRAM
- cycles_t start;
- dev->lck_start = start = get_cycles();
- #endif
- if (copy_from_user(&lock, (drm_lock_t *)arg, sizeof(lock)))
- return -EFAULT;
- if (lock.context == DRM_KERNEL_CONTEXT) {
- DRM_ERROR("Process %d using kernel context %dn",
- current->pid, lock.context);
- return -EINVAL;
- }
- DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08xn",
- lock.context, current->pid, dev->lock.hw_lock->lock,
- lock.flags);
- if (lock.context < 0 || lock.context >= dev->queue_count)
- return -EINVAL;
- q = dev->queuelist[lock.context];
-
- ret = drm_flush_block_and_flush(dev, lock.context, lock.flags);
- if (!ret) {
- if (_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)
- != lock.context) {
- long j = jiffies - dev->lock.lock_time;
- if (j > 0 && j <= DRM_LOCK_SLICE) {
- /* Can't take lock if we just had it and
- there is contention. */
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(j);
- }
- }
- add_wait_queue(&dev->lock.lock_queue, &entry);
- for (;;) {
- current->state = TASK_INTERRUPTIBLE;
- if (!dev->lock.hw_lock) {
- /* Device has been unregistered */
- ret = -EINTR;
- break;
- }
- if (drm_lock_take(&dev->lock.hw_lock->lock,
- lock.context)) {
- dev->lock.pid = current->pid;
- dev->lock.lock_time = jiffies;
- atomic_inc(&dev->total_locks);
- atomic_inc(&q->total_locks);
- break; /* Got lock */
- }
-
- /* Contention */
- atomic_inc(&dev->total_sleeps);
- schedule();
- if (signal_pending(current)) {
- ret = -ERESTARTSYS;
- break;
- }
- }
- current->state = TASK_RUNNING;
- remove_wait_queue(&dev->lock.lock_queue, &entry);
- }
- drm_flush_unblock(dev, lock.context, lock.flags); /* cleanup phase */
-
- if (!ret) {
- sigemptyset(&dev->sigmask);
- sigaddset(&dev->sigmask, SIGSTOP);
- sigaddset(&dev->sigmask, SIGTSTP);
- sigaddset(&dev->sigmask, SIGTTIN);
- sigaddset(&dev->sigmask, SIGTTOU);
- dev->sigdata.context = lock.context;
- dev->sigdata.lock = dev->lock.hw_lock;
- block_all_signals(drm_notifier, &dev->sigdata, &dev->sigmask);
- if (lock.flags & _DRM_LOCK_READY)
- gamma_dma_ready(dev);
- if (lock.flags & _DRM_LOCK_QUIESCENT) {
- if (gamma_found() == 1) {
- gamma_dma_quiescent_single(dev);
- } else {
- gamma_dma_quiescent_dual(dev);
- }
- }
- }
- DRM_DEBUG("%d %sn", lock.context, ret ? "interrupted" : "has lock");
- #if DRM_DMA_HISTOGRAM
- atomic_inc(&dev->histo.lacq[drm_histogram_slot(get_cycles() - start)]);
- #endif
-
- return ret;
- }