summaryrefslogtreecommitdiff
path: root/bsd/drm_dma.h
diff options
context:
space:
mode:
authorDavid Dawes <dawes@xfree86.org>2002-01-27 18:23:04 +0000
committerDavid Dawes <dawes@xfree86.org>2002-01-27 18:23:04 +0000
commit16bd14926e02e4dbc6e74689bdb3eb90f30a0233 (patch)
tree9d7cb6b98165c9e2a9091c41a39acca11d6fa162 /bsd/drm_dma.h
parentf18a6d836b5e0081dff9217b44e88e74c421c576 (diff)
Initial revision
Diffstat (limited to 'bsd/drm_dma.h')
-rw-r--r--bsd/drm_dma.h605
1 files changed, 605 insertions, 0 deletions
diff --git a/bsd/drm_dma.h b/bsd/drm_dma.h
new file mode 100644
index 00000000..e5aef241
--- /dev/null
+++ b/bsd/drm_dma.h
@@ -0,0 +1,605 @@
+/* drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
+ * Created: Fri Mar 19 14:30:16 1999 by faith@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.
+ *
+ * Authors:
+ * Rickard E. (Rik) Faith <faith@valinux.com>
+ * Gareth Hughes <gareth@valinux.com>
+ */
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <sys/rman.h>
+
+#include "drmP.h"
+
+#ifndef __HAVE_DMA_WAITQUEUE
+#define __HAVE_DMA_WAITQUEUE 0
+#endif
+#ifndef __HAVE_DMA_RECLAIM
+#define __HAVE_DMA_RECLAIM 0
+#endif
+#ifndef __HAVE_SHARED_IRQ
+#define __HAVE_SHARED_IRQ 0
+#endif
+
+#if __HAVE_SHARED_IRQ
+#define DRM_IRQ_TYPE SA_SHIRQ
+#else
+#define DRM_IRQ_TYPE 0
+#endif
+
+#if __HAVE_DMA
+
+int DRM(dma_setup)( drm_device_t *dev )
+{
+ int i;
+
+ dev->dma = DRM(alloc)( sizeof(*dev->dma), DRM_MEM_DRIVER );
+ if ( !dev->dma )
+ DRM_OS_RETURN(ENOMEM);
+
+ memset( dev->dma, 0, sizeof(*dev->dma) );
+
+ for ( i = 0 ; i <= DRM_MAX_ORDER ; i++ )
+ memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
+
+ return 0;
+}
+
+void DRM(dma_takedown)(drm_device_t *dev)
+{
+ drm_device_dma_t *dma = dev->dma;
+ int i, j;
+
+ if (!dma) return;
+
+ /* Clear dma buffers */
+ for (i = 0; i <= DRM_MAX_ORDER; i++) {
+ if (dma->bufs[i].seg_count) {
+ DRM_DEBUG("order %d: buf_count = %d,"
+ " seg_count = %d\n",
+ i,
+ dma->bufs[i].buf_count,
+ dma->bufs[i].seg_count);
+ for (j = 0; j < dma->bufs[i].seg_count; j++) {
+ DRM(free_pages)(dma->bufs[i].seglist[j],
+ dma->bufs[i].page_order,
+ DRM_MEM_DMA);
+ }
+ DRM(free)(dma->bufs[i].seglist,
+ dma->bufs[i].seg_count
+ * sizeof(*dma->bufs[0].seglist),
+ DRM_MEM_SEGS);
+ }
+ if(dma->bufs[i].buf_count) {
+ for(j = 0; j < dma->bufs[i].buf_count; j++) {
+ if(dma->bufs[i].buflist[j].dev_private) {
+ DRM(free)(dma->bufs[i].buflist[j].dev_private,
+ dma->bufs[i].buflist[j].dev_priv_size,
+ DRM_MEM_BUFS);
+ }
+ }
+ DRM(free)(dma->bufs[i].buflist,
+ dma->bufs[i].buf_count *
+ sizeof(*dma->bufs[0].buflist),
+ DRM_MEM_BUFS);
+#if __HAVE_DMA_FREELIST
+ DRM(freelist_destroy)(&dma->bufs[i].freelist);
+#endif
+ }
+ }
+
+ if (dma->buflist) {
+ DRM(free)(dma->buflist,
+ dma->buf_count * sizeof(*dma->buflist),
+ DRM_MEM_BUFS);
+ }
+
+ if (dma->pagelist) {
+ DRM(free)(dma->pagelist,
+ dma->page_count * sizeof(*dma->pagelist),
+ DRM_MEM_PAGES);
+ }
+ DRM(free)(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
+ dev->dma = NULL;
+}
+
+
+#if __HAVE_DMA_HISTOGRAM
+/* This is slow, but is useful for debugging. */
+int DRM(histogram_slot)(unsigned long count)
+{
+ int value = DRM_DMA_HISTOGRAM_INITIAL;
+ int slot;
+
+ for (slot = 0;
+ slot < DRM_DMA_HISTOGRAM_SLOTS;
+ ++slot, value = DRM_DMA_HISTOGRAM_NEXT(value)) {
+ if (count < value) return slot;
+ }
+ return DRM_DMA_HISTOGRAM_SLOTS - 1;
+}
+
+void DRM(histogram_compute)(drm_device_t *dev, drm_buf_t *buf)
+{
+ cycles_t queued_to_dispatched;
+ cycles_t dispatched_to_completed;
+ cycles_t completed_to_freed;
+ int q2d, d2c, c2f, q2c, q2f;
+
+ if (buf->time_queued) {
+ queued_to_dispatched = (buf->time_dispatched
+ - buf->time_queued);
+ dispatched_to_completed = (buf->time_completed
+ - buf->time_dispatched);
+ completed_to_freed = (buf->time_freed
+ - buf->time_completed);
+
+ q2d = DRM(histogram_slot)(queued_to_dispatched);
+ d2c = DRM(histogram_slot)(dispatched_to_completed);
+ c2f = DRM(histogram_slot)(completed_to_freed);
+
+ q2c = DRM(histogram_slot)(queued_to_dispatched
+ + dispatched_to_completed);
+ q2f = DRM(histogram_slot)(queued_to_dispatched
+ + dispatched_to_completed
+ + completed_to_freed);
+
+ atomic_inc(&dev->histo.total);
+ atomic_inc(&dev->histo.queued_to_dispatched[q2d]);
+ atomic_inc(&dev->histo.dispatched_to_completed[d2c]);
+ atomic_inc(&dev->histo.completed_to_freed[c2f]);
+
+ atomic_inc(&dev->histo.queued_to_completed[q2c]);
+ atomic_inc(&dev->histo.queued_to_freed[q2f]);
+
+ }
+ buf->time_queued = 0;
+ buf->time_dispatched = 0;
+ buf->time_completed = 0;
+ buf->time_freed = 0;
+}
+#endif
+
+void DRM(free_buffer)(drm_device_t *dev, drm_buf_t *buf)
+{
+ if (!buf) return;
+
+ buf->waiting = 0;
+ buf->pending = 0;
+ buf->pid = 0;
+ buf->used = 0;
+#if __HAVE_DMA_HISTOGRAM
+ buf->time_completed = get_cycles();
+#endif
+
+ if ( buf->dma_wait ) {
+ wakeup( &buf->dma_wait );
+ buf->dma_wait = 0;
+ }
+#if __HAVE_DMA_FREELIST
+ else {
+ drm_device_dma_t *dma = dev->dma;
+ /* If processes are waiting, the last one
+ to wake will put the buffer on the free
+ list. If no processes are waiting, we
+ put the buffer on the freelist here. */
+ DRM(freelist_put)(dev, &dma->bufs[buf->order].freelist, buf);
+ }
+#endif
+}
+
+#if !__HAVE_DMA_RECLAIM
+void DRM(reclaim_buffers)(drm_device_t *dev, pid_t pid)
+{
+ drm_device_dma_t *dma = dev->dma;
+ int i;
+
+ if (!dma) return;
+ for (i = 0; i < dma->buf_count; i++) {
+ if (dma->buflist[i]->pid == pid) {
+ switch (dma->buflist[i]->list) {
+ case DRM_LIST_NONE:
+ DRM(free_buffer)(dev, dma->buflist[i]);
+ break;
+ case DRM_LIST_WAIT:
+ dma->buflist[i]->list = DRM_LIST_RECLAIM;
+ break;
+ default:
+ /* Buffer already on hardware. */
+ break;
+ }
+ }
+ }
+}
+#endif
+
+
+/* GH: This is a big hack for now...
+ */
+#if __HAVE_OLD_DMA
+
+void DRM(clear_next_buffer)(drm_device_t *dev)
+{
+ drm_device_dma_t *dma = dev->dma;
+
+ dma->next_buffer = NULL;
+ if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) {
+ DRM_OS_WAKEUP_INT(&dma->next_queue->flush_queue);
+ }
+ dma->next_queue = NULL;
+}
+
+int DRM(select_queue)(drm_device_t *dev, void (*wrapper)(unsigned long))
+{
+ int i;
+ int candidate = -1;
+ int j = jiffies;
+
+ if (!dev) {
+ DRM_ERROR("No device\n");
+ return -1;
+ }
+ if (!dev->queuelist || !dev->queuelist[DRM_KERNEL_CONTEXT]) {
+ /* This only happens between the time the
+ interrupt is initialized and the time
+ the queues are initialized. */
+ return -1;
+ }
+
+ /* Doing "while locked" DMA? */
+ if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) {
+ return DRM_KERNEL_CONTEXT;
+ }
+
+ /* If there are buffers on the last_context
+ queue, and we have not been executing
+ this context very long, continue to
+ execute this context. */
+ if (dev->last_switch <= j
+ && dev->last_switch + DRM_TIME_SLICE > j
+ && DRM_WAITCOUNT(dev, dev->last_context)) {
+ return dev->last_context;
+ }
+
+ /* Otherwise, find a candidate */
+ for (i = dev->last_checked + 1; i < dev->queue_count; i++) {
+ if (DRM_WAITCOUNT(dev, i)) {
+ candidate = dev->last_checked = i;
+ break;
+ }
+ }
+
+ if (candidate < 0) {
+ for (i = 0; i < dev->queue_count; i++) {
+ if (DRM_WAITCOUNT(dev, i)) {
+ candidate = dev->last_checked = i;
+ break;
+ }
+ }
+ }
+
+ if (wrapper
+ && candidate >= 0
+ && candidate != dev->last_context
+ && dev->last_switch <= j
+ && dev->last_switch + DRM_TIME_SLICE > j) {
+ int s = splclock();
+ if (dev->timer.c_time != dev->last_switch + DRM_TIME_SLICE) {
+ callout_reset(&dev->timer,
+ dev->last_switch + DRM_TIME_SLICE - j,
+ (void (*)(void *))wrapper,
+ dev);
+ }
+ splx(s);
+ return -1;
+ }
+
+ return candidate;
+}
+
+
+int DRM(dma_enqueue)(drm_device_t *dev, drm_dma_t *d)
+{
+ int i;
+ drm_queue_t *q;
+ drm_buf_t *buf;
+ int idx;
+ int while_locked = 0;
+ drm_device_dma_t *dma = dev->dma;
+ int error;
+
+ DRM_DEBUG("%d\n", d->send_count);
+
+ if (d->flags & _DRM_DMA_WHILE_LOCKED) {
+ int context = dev->lock.hw_lock->lock;
+
+ if (!_DRM_LOCK_IS_HELD(context)) {
+ DRM_ERROR("No lock held during \"while locked\""
+ " request\n");
+ DRM_OS_RETURN(EINVAL);
+ }
+ if (d->context != _DRM_LOCKING_CONTEXT(context)
+ && _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) {
+ DRM_ERROR("Lock held by %d while %d makes"
+ " \"while locked\" request\n",
+ _DRM_LOCKING_CONTEXT(context),
+ d->context);
+ DRM_OS_RETURN(EINVAL);
+ }
+ q = dev->queuelist[DRM_KERNEL_CONTEXT];
+ while_locked = 1;
+ } else {
+ q = dev->queuelist[d->context];
+ }
+
+
+ atomic_inc(&q->use_count);
+ if (atomic_read(&q->block_write)) {
+ atomic_inc(&q->block_count);
+ for (;;) {
+ if (!atomic_read(&q->block_write)) break;
+ error = tsleep(&q->block_write, PZERO|PCATCH,
+ "dmawr", 0);
+ if (error) {
+ atomic_dec(&q->use_count);
+ return error;
+ }
+ }
+ atomic_dec(&q->block_count);
+ }
+
+ for (i = 0; i < d->send_count; i++) {
+ idx = d->send_indices[i];
+ if (idx < 0 || idx >= dma->buf_count) {
+ atomic_dec(&q->use_count);
+ DRM_ERROR("Index %d (of %d max)\n",
+ d->send_indices[i], dma->buf_count - 1);
+ DRM_OS_RETURN(EINVAL);
+ }
+ buf = dma->buflist[ idx ];
+ if (buf->pid != DRM_OS_CURRENTPID) {
+ atomic_dec(&q->use_count);
+ DRM_ERROR("Process %d using buffer owned by %d\n",
+ DRM_OS_CURRENTPID, buf->pid);
+ DRM_OS_RETURN(EINVAL);
+ }
+ if (buf->list != DRM_LIST_NONE) {
+ atomic_dec(&q->use_count);
+ DRM_ERROR("Process %d using buffer %d on list %d\n",
+ DRM_OS_CURRENTPID, buf->idx, buf->list);
+ }
+ buf->used = d->send_sizes[i];
+ buf->while_locked = while_locked;
+ buf->context = d->context;
+ if (!buf->used) {
+ DRM_ERROR("Queueing 0 length buffer\n");
+ }
+ if (buf->pending) {
+ atomic_dec(&q->use_count);
+ DRM_ERROR("Queueing pending buffer:"
+ " buffer %d, offset %d\n",
+ d->send_indices[i], i);
+ DRM_OS_RETURN(EINVAL);
+ }
+ if (buf->waiting) {
+ atomic_dec(&q->use_count);
+ DRM_ERROR("Queueing waiting buffer:"
+ " buffer %d, offset %d\n",
+ d->send_indices[i], i);
+ DRM_OS_RETURN(EINVAL);
+ }
+ buf->waiting = 1;
+ if (atomic_read(&q->use_count) == 1
+ || atomic_read(&q->finalization)) {
+ DRM(free_buffer)(dev, buf);
+ } else {
+ DRM(waitlist_put)(&q->waitlist, buf);
+ atomic_inc(&q->total_queued);
+ }
+ }
+ atomic_dec(&q->use_count);
+
+ return 0;
+}
+
+static int DRM(dma_get_buffers_of_order)(drm_device_t *dev, drm_dma_t *d,
+ int order)
+{
+ int i;
+ drm_buf_t *buf;
+ drm_device_dma_t *dma = dev->dma;
+
+ for (i = d->granted_count; i < d->request_count; i++) {
+ buf = DRM(freelist_get)(&dma->bufs[order].freelist,
+ d->flags & _DRM_DMA_WAIT);
+ if (!buf) break;
+ if (buf->pending || buf->waiting) {
+ DRM_ERROR("Free buffer %d in use by %d (w%d, p%d)\n",
+ buf->idx,
+ buf->pid,
+ buf->waiting,
+ buf->pending);
+ }
+ buf->pid = DRM_OS_CURRENTPID;
+ if (DRM_OS_COPYTOUSR(&d->request_indices[i],
+ &buf->idx,
+ sizeof(buf->idx)))
+ DRM_OS_RETURN(EFAULT);
+
+ if (DRM_OS_COPYTOUSR(&d->request_sizes[i],
+ &buf->total,
+ sizeof(buf->total)))
+ DRM_OS_RETURN(EFAULT);
+
+ ++d->granted_count;
+ }
+ return 0;
+}
+
+
+int DRM(dma_get_buffers)(drm_device_t *dev, drm_dma_t *dma)
+{
+ int order;
+ int retcode = 0;
+ int tmp_order;
+
+ order = DRM(order)(dma->request_size);
+
+ dma->granted_count = 0;
+ retcode = DRM(dma_get_buffers_of_order)(dev, dma, order);
+
+ if (dma->granted_count < dma->request_count
+ && (dma->flags & _DRM_DMA_SMALLER_OK)) {
+ for (tmp_order = order - 1;
+ !retcode
+ && dma->granted_count < dma->request_count
+ && tmp_order >= DRM_MIN_ORDER;
+ --tmp_order) {
+
+ retcode = DRM(dma_get_buffers_of_order)(dev, dma,
+ tmp_order);
+ }
+ }
+
+ if (dma->granted_count < dma->request_count
+ && (dma->flags & _DRM_DMA_LARGER_OK)) {
+ for (tmp_order = order + 1;
+ !retcode
+ && dma->granted_count < dma->request_count
+ && tmp_order <= DRM_MAX_ORDER;
+ ++tmp_order) {
+
+ retcode = DRM(dma_get_buffers_of_order)(dev, dma,
+ tmp_order);
+ }
+ }
+ return 0;
+}
+
+#endif /* __HAVE_OLD_DMA */
+
+
+#if __HAVE_DMA_IRQ
+
+int DRM(irq_install)( drm_device_t *dev, int irq )
+{
+ int rid;
+ int retcode;
+
+ if ( !irq )
+ DRM_OS_RETURN(EINVAL);
+
+ DRM_OS_LOCK;
+ if ( dev->irq ) {
+ DRM_OS_UNLOCK;
+ DRM_OS_RETURN(EBUSY);
+ }
+ dev->irq = irq;
+ DRM_OS_UNLOCK;
+
+ DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, 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;
+
+#if __HAVE_DMA_IRQ_BH
+ TASK_INIT(&dev->task, 0, DRM(dma_immediate_bh), dev);
+#endif
+
+ /* Before installing handler */
+ DRIVER_PREINSTALL();
+
+ /* Install handler */
+ rid = 0;
+ dev->irqr = bus_alloc_resource(dev->device, SYS_RES_IRQ, &rid,
+ 0, ~0, 1, RF_SHAREABLE);
+ if (!dev->irqr)
+ return ENOENT;
+
+ retcode = bus_setup_intr(dev->device, dev->irqr, INTR_TYPE_TTY,
+ DRM(dma_service), dev, &dev->irqh);
+ if ( retcode ) {
+ DRM_OS_LOCK;
+ bus_release_resource(dev->device, SYS_RES_IRQ, 0, dev->irqr);
+ dev->irq = 0;
+ DRM_OS_UNLOCK;
+ return retcode;
+ }
+
+ /* After installing handler */
+ DRIVER_POSTINSTALL();
+
+ return 0;
+}
+
+int DRM(irq_uninstall)( drm_device_t *dev )
+{
+ int irq;
+
+ DRM_OS_LOCK;
+ irq = dev->irq;
+ dev->irq = 0;
+ DRM_OS_UNLOCK;
+
+ if ( !irq )
+ DRM_OS_RETURN(EINVAL);
+
+ DRM_DEBUG( "%s: irq=%d\n", __FUNCTION__, irq );
+
+ DRIVER_UNINSTALL();
+
+ bus_teardown_intr(dev->device, dev->irqr, dev->irqh);
+ bus_release_resource(dev->device, SYS_RES_IRQ, 0, dev->irqr);
+
+ return 0;
+}
+
+int DRM(control)( DRM_OS_IOCTL )
+{
+ DRM_OS_DEVICE;
+ drm_control_t ctl;
+
+ DRM_OS_KRNFROMUSR( ctl, (drm_control_t *) data, sizeof(ctl) );
+
+ switch ( ctl.func ) {
+ case DRM_INST_HANDLER:
+ return DRM(irq_install)( dev, ctl.irq );
+ case DRM_UNINST_HANDLER:
+ return DRM(irq_uninstall)( dev );
+ default:
+ DRM_OS_RETURN(EINVAL);
+ }
+}
+
+#endif /* __HAVE_DMA_IRQ */
+
+#endif /* __HAVE_DMA */