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-rw-r--r--drivers/char/drm/mga_dma.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/drivers/char/drm/mga_dma.c b/drivers/char/drm/mga_dma.c
new file mode 100644
index 000000000000..832eaf8a5068
--- /dev/null
+++ b/drivers/char/drm/mga_dma.c
@@ -0,0 +1,754 @@
+/* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
+ * Created: Mon Dec 13 01:50:01 1999 by jhartmann@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>
+ * Jeff Hartmann <jhartmann@valinux.com>
+ * Keith Whitwell <keith@tungstengraphics.com>
+ *
+ * Rewritten by:
+ * Gareth Hughes <gareth@valinux.com>
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "mga_drm.h"
+#include "mga_drv.h"
+
+#define MGA_DEFAULT_USEC_TIMEOUT 10000
+#define MGA_FREELIST_DEBUG 0
+
+static int mga_do_cleanup_dma( drm_device_t *dev );
+
+/* ================================================================
+ * Engine control
+ */
+
+int mga_do_wait_for_idle( drm_mga_private_t *dev_priv )
+{
+ u32 status = 0;
+ int i;
+ DRM_DEBUG( "\n" );
+
+ for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
+ status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
+ if ( status == MGA_ENDPRDMASTS ) {
+ MGA_WRITE8( MGA_CRTC_INDEX, 0 );
+ return 0;
+ }
+ DRM_UDELAY( 1 );
+ }
+
+#if MGA_DMA_DEBUG
+ DRM_ERROR( "failed!\n" );
+ DRM_INFO( " status=0x%08x\n", status );
+#endif
+ return DRM_ERR(EBUSY);
+}
+
+static int mga_do_dma_reset( drm_mga_private_t *dev_priv )
+{
+ drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
+ drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+
+ DRM_DEBUG( "\n" );
+
+ /* The primary DMA stream should look like new right about now.
+ */
+ primary->tail = 0;
+ primary->space = primary->size;
+ primary->last_flush = 0;
+
+ sarea_priv->last_wrap = 0;
+
+ /* FIXME: Reset counters, buffer ages etc...
+ */
+
+ /* FIXME: What else do we need to reinitialize? WARP stuff?
+ */
+
+ return 0;
+}
+
+/* ================================================================
+ * Primary DMA stream
+ */
+
+void mga_do_dma_flush( drm_mga_private_t *dev_priv )
+{
+ drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+ u32 head, tail;
+ u32 status = 0;
+ int i;
+ DMA_LOCALS;
+ DRM_DEBUG( "\n" );
+
+ /* We need to wait so that we can do an safe flush */
+ for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
+ status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
+ if ( status == MGA_ENDPRDMASTS ) break;
+ DRM_UDELAY( 1 );
+ }
+
+ if ( primary->tail == primary->last_flush ) {
+ DRM_DEBUG( " bailing out...\n" );
+ return;
+ }
+
+ tail = primary->tail + dev_priv->primary->offset;
+
+ /* We need to pad the stream between flushes, as the card
+ * actually (partially?) reads the first of these commands.
+ * See page 4-16 in the G400 manual, middle of the page or so.
+ */
+ BEGIN_DMA( 1 );
+
+ DMA_BLOCK( MGA_DMAPAD, 0x00000000,
+ MGA_DMAPAD, 0x00000000,
+ MGA_DMAPAD, 0x00000000,
+ MGA_DMAPAD, 0x00000000 );
+
+ ADVANCE_DMA();
+
+ primary->last_flush = primary->tail;
+
+ head = MGA_READ( MGA_PRIMADDRESS );
+
+ if ( head <= tail ) {
+ primary->space = primary->size - primary->tail;
+ } else {
+ primary->space = head - tail;
+ }
+
+ DRM_DEBUG( " head = 0x%06lx\n", head - dev_priv->primary->offset );
+ DRM_DEBUG( " tail = 0x%06lx\n", tail - dev_priv->primary->offset );
+ DRM_DEBUG( " space = 0x%06x\n", primary->space );
+
+ mga_flush_write_combine();
+ MGA_WRITE( MGA_PRIMEND, tail | MGA_PAGPXFER );
+
+ DRM_DEBUG( "done.\n" );
+}
+
+void mga_do_dma_wrap_start( drm_mga_private_t *dev_priv )
+{
+ drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+ u32 head, tail;
+ DMA_LOCALS;
+ DRM_DEBUG( "\n" );
+
+ BEGIN_DMA_WRAP();
+
+ DMA_BLOCK( MGA_DMAPAD, 0x00000000,
+ MGA_DMAPAD, 0x00000000,
+ MGA_DMAPAD, 0x00000000,
+ MGA_DMAPAD, 0x00000000 );
+
+ ADVANCE_DMA();
+
+ tail = primary->tail + dev_priv->primary->offset;
+
+ primary->tail = 0;
+ primary->last_flush = 0;
+ primary->last_wrap++;
+
+ head = MGA_READ( MGA_PRIMADDRESS );
+
+ if ( head == dev_priv->primary->offset ) {
+ primary->space = primary->size;
+ } else {
+ primary->space = head - dev_priv->primary->offset;
+ }
+
+ DRM_DEBUG( " head = 0x%06lx\n",
+ head - dev_priv->primary->offset );
+ DRM_DEBUG( " tail = 0x%06x\n", primary->tail );
+ DRM_DEBUG( " wrap = %d\n", primary->last_wrap );
+ DRM_DEBUG( " space = 0x%06x\n", primary->space );
+
+ mga_flush_write_combine();
+ MGA_WRITE( MGA_PRIMEND, tail | MGA_PAGPXFER );
+
+ set_bit( 0, &primary->wrapped );
+ DRM_DEBUG( "done.\n" );
+}
+
+void mga_do_dma_wrap_end( drm_mga_private_t *dev_priv )
+{
+ drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+ drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
+ u32 head = dev_priv->primary->offset;
+ DRM_DEBUG( "\n" );
+
+ sarea_priv->last_wrap++;
+ DRM_DEBUG( " wrap = %d\n", sarea_priv->last_wrap );
+
+ mga_flush_write_combine();
+ MGA_WRITE( MGA_PRIMADDRESS, head | MGA_DMA_GENERAL );
+
+ clear_bit( 0, &primary->wrapped );
+ DRM_DEBUG( "done.\n" );
+}
+
+
+/* ================================================================
+ * Freelist management
+ */
+
+#define MGA_BUFFER_USED ~0
+#define MGA_BUFFER_FREE 0
+
+#if MGA_FREELIST_DEBUG
+static void mga_freelist_print( drm_device_t *dev )
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_mga_freelist_t *entry;
+
+ DRM_INFO( "\n" );
+ DRM_INFO( "current dispatch: last=0x%x done=0x%x\n",
+ dev_priv->sarea_priv->last_dispatch,
+ (unsigned int)(MGA_READ( MGA_PRIMADDRESS ) -
+ dev_priv->primary->offset) );
+ DRM_INFO( "current freelist:\n" );
+
+ for ( entry = dev_priv->head->next ; entry ; entry = entry->next ) {
+ DRM_INFO( " %p idx=%2d age=0x%x 0x%06lx\n",
+ entry, entry->buf->idx, entry->age.head,
+ entry->age.head - dev_priv->primary->offset );
+ }
+ DRM_INFO( "\n" );
+}
+#endif
+
+static int mga_freelist_init( drm_device_t *dev, drm_mga_private_t *dev_priv )
+{
+ drm_device_dma_t *dma = dev->dma;
+ drm_buf_t *buf;
+ drm_mga_buf_priv_t *buf_priv;
+ drm_mga_freelist_t *entry;
+ int i;
+ DRM_DEBUG( "count=%d\n", dma->buf_count );
+
+ dev_priv->head = drm_alloc( sizeof(drm_mga_freelist_t),
+ DRM_MEM_DRIVER );
+ if ( dev_priv->head == NULL )
+ return DRM_ERR(ENOMEM);
+
+ memset( dev_priv->head, 0, sizeof(drm_mga_freelist_t) );
+ SET_AGE( &dev_priv->head->age, MGA_BUFFER_USED, 0 );
+
+ for ( i = 0 ; i < dma->buf_count ; i++ ) {
+ buf = dma->buflist[i];
+ buf_priv = buf->dev_private;
+
+ entry = drm_alloc( sizeof(drm_mga_freelist_t),
+ DRM_MEM_DRIVER );
+ if ( entry == NULL )
+ return DRM_ERR(ENOMEM);
+
+ memset( entry, 0, sizeof(drm_mga_freelist_t) );
+
+ entry->next = dev_priv->head->next;
+ entry->prev = dev_priv->head;
+ SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
+ entry->buf = buf;
+
+ if ( dev_priv->head->next != NULL )
+ dev_priv->head->next->prev = entry;
+ if ( entry->next == NULL )
+ dev_priv->tail = entry;
+
+ buf_priv->list_entry = entry;
+ buf_priv->discard = 0;
+ buf_priv->dispatched = 0;
+
+ dev_priv->head->next = entry;
+ }
+
+ return 0;
+}
+
+static void mga_freelist_cleanup( drm_device_t *dev )
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_mga_freelist_t *entry;
+ drm_mga_freelist_t *next;
+ DRM_DEBUG( "\n" );
+
+ entry = dev_priv->head;
+ while ( entry ) {
+ next = entry->next;
+ drm_free( entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER );
+ entry = next;
+ }
+
+ dev_priv->head = dev_priv->tail = NULL;
+}
+
+#if 0
+/* FIXME: Still needed?
+ */
+static void mga_freelist_reset( drm_device_t *dev )
+{
+ drm_device_dma_t *dma = dev->dma;
+ drm_buf_t *buf;
+ drm_mga_buf_priv_t *buf_priv;
+ int i;
+
+ for ( i = 0 ; i < dma->buf_count ; i++ ) {
+ buf = dma->buflist[i];
+ buf_priv = buf->dev_private;
+ SET_AGE( &buf_priv->list_entry->age,
+ MGA_BUFFER_FREE, 0 );
+ }
+}
+#endif
+
+static drm_buf_t *mga_freelist_get( drm_device_t *dev )
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_mga_freelist_t *next;
+ drm_mga_freelist_t *prev;
+ drm_mga_freelist_t *tail = dev_priv->tail;
+ u32 head, wrap;
+ DRM_DEBUG( "\n" );
+
+ head = MGA_READ( MGA_PRIMADDRESS );
+ wrap = dev_priv->sarea_priv->last_wrap;
+
+ DRM_DEBUG( " tail=0x%06lx %d\n",
+ tail->age.head ?
+ tail->age.head - dev_priv->primary->offset : 0,
+ tail->age.wrap );
+ DRM_DEBUG( " head=0x%06lx %d\n",
+ head - dev_priv->primary->offset, wrap );
+
+ if ( TEST_AGE( &tail->age, head, wrap ) ) {
+ prev = dev_priv->tail->prev;
+ next = dev_priv->tail;
+ prev->next = NULL;
+ next->prev = next->next = NULL;
+ dev_priv->tail = prev;
+ SET_AGE( &next->age, MGA_BUFFER_USED, 0 );
+ return next->buf;
+ }
+
+ DRM_DEBUG( "returning NULL!\n" );
+ return NULL;
+}
+
+int mga_freelist_put( drm_device_t *dev, drm_buf_t *buf )
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_mga_buf_priv_t *buf_priv = buf->dev_private;
+ drm_mga_freelist_t *head, *entry, *prev;
+
+ DRM_DEBUG( "age=0x%06lx wrap=%d\n",
+ buf_priv->list_entry->age.head -
+ dev_priv->primary->offset,
+ buf_priv->list_entry->age.wrap );
+
+ entry = buf_priv->list_entry;
+ head = dev_priv->head;
+
+ if ( buf_priv->list_entry->age.head == MGA_BUFFER_USED ) {
+ SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
+ prev = dev_priv->tail;
+ prev->next = entry;
+ entry->prev = prev;
+ entry->next = NULL;
+ } else {
+ prev = head->next;
+ head->next = entry;
+ prev->prev = entry;
+ entry->prev = head;
+ entry->next = prev;
+ }
+
+ return 0;
+}
+
+
+/* ================================================================
+ * DMA initialization, cleanup
+ */
+
+static int mga_do_init_dma( drm_device_t *dev, drm_mga_init_t *init )
+{
+ drm_mga_private_t *dev_priv;
+ int ret;
+ DRM_DEBUG( "\n" );
+
+ dev_priv = drm_alloc( sizeof(drm_mga_private_t), DRM_MEM_DRIVER );
+ if ( !dev_priv )
+ return DRM_ERR(ENOMEM);
+
+ memset( dev_priv, 0, sizeof(drm_mga_private_t) );
+
+ dev_priv->chipset = init->chipset;
+
+ dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
+
+ if ( init->sgram ) {
+ dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
+ } else {
+ dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
+ }
+ dev_priv->maccess = init->maccess;
+
+ dev_priv->fb_cpp = init->fb_cpp;
+ dev_priv->front_offset = init->front_offset;
+ dev_priv->front_pitch = init->front_pitch;
+ dev_priv->back_offset = init->back_offset;
+ dev_priv->back_pitch = init->back_pitch;
+
+ dev_priv->depth_cpp = init->depth_cpp;
+ dev_priv->depth_offset = init->depth_offset;
+ dev_priv->depth_pitch = init->depth_pitch;
+
+ /* FIXME: Need to support AGP textures...
+ */
+ dev_priv->texture_offset = init->texture_offset[0];
+ dev_priv->texture_size = init->texture_size[0];
+
+ DRM_GETSAREA();
+
+ if(!dev_priv->sarea) {
+ DRM_ERROR( "failed to find sarea!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(EINVAL);
+ }
+
+ dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
+ if(!dev_priv->mmio) {
+ DRM_ERROR( "failed to find mmio region!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(EINVAL);
+ }
+ dev_priv->status = drm_core_findmap(dev, init->status_offset);
+ if(!dev_priv->status) {
+ DRM_ERROR( "failed to find status page!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(EINVAL);
+ }
+ dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
+ if(!dev_priv->warp) {
+ DRM_ERROR( "failed to find warp microcode region!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(EINVAL);
+ }
+ dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
+ if(!dev_priv->primary) {
+ DRM_ERROR( "failed to find primary dma region!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(EINVAL);
+ }
+ dev->agp_buffer_map = drm_core_findmap(dev, init->buffers_offset);
+ if(!dev->agp_buffer_map) {
+ DRM_ERROR( "failed to find dma buffer region!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(EINVAL);
+ }
+
+ dev_priv->sarea_priv =
+ (drm_mga_sarea_t *)((u8 *)dev_priv->sarea->handle +
+ init->sarea_priv_offset);
+
+ drm_core_ioremap( dev_priv->warp, dev );
+ drm_core_ioremap( dev_priv->primary, dev );
+ drm_core_ioremap( dev->agp_buffer_map, dev );
+
+ if(!dev_priv->warp->handle ||
+ !dev_priv->primary->handle ||
+ !dev->agp_buffer_map->handle ) {
+ DRM_ERROR( "failed to ioremap agp regions!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(ENOMEM);
+ }
+
+ ret = mga_warp_install_microcode( dev_priv );
+ if ( ret < 0 ) {
+ DRM_ERROR( "failed to install WARP ucode!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return ret;
+ }
+
+ ret = mga_warp_init( dev_priv );
+ if ( ret < 0 ) {
+ DRM_ERROR( "failed to init WARP engine!\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return ret;
+ }
+
+ dev_priv->prim.status = (u32 *)dev_priv->status->handle;
+
+ mga_do_wait_for_idle( dev_priv );
+
+ /* Init the primary DMA registers.
+ */
+ MGA_WRITE( MGA_PRIMADDRESS,
+ dev_priv->primary->offset | MGA_DMA_GENERAL );
+#if 0
+ MGA_WRITE( MGA_PRIMPTR,
+ virt_to_bus((void *)dev_priv->prim.status) |
+ MGA_PRIMPTREN0 | /* Soft trap, SECEND, SETUPEND */
+ MGA_PRIMPTREN1 ); /* DWGSYNC */
+#endif
+
+ dev_priv->prim.start = (u8 *)dev_priv->primary->handle;
+ dev_priv->prim.end = ((u8 *)dev_priv->primary->handle
+ + dev_priv->primary->size);
+ dev_priv->prim.size = dev_priv->primary->size;
+
+ dev_priv->prim.tail = 0;
+ dev_priv->prim.space = dev_priv->prim.size;
+ dev_priv->prim.wrapped = 0;
+
+ dev_priv->prim.last_flush = 0;
+ dev_priv->prim.last_wrap = 0;
+
+ dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
+
+ dev_priv->prim.status[0] = dev_priv->primary->offset;
+ dev_priv->prim.status[1] = 0;
+
+ dev_priv->sarea_priv->last_wrap = 0;
+ dev_priv->sarea_priv->last_frame.head = 0;
+ dev_priv->sarea_priv->last_frame.wrap = 0;
+
+ if ( mga_freelist_init( dev, dev_priv ) < 0 ) {
+ DRM_ERROR( "could not initialize freelist\n" );
+ /* Assign dev_private so we can do cleanup. */
+ dev->dev_private = (void *)dev_priv;
+ mga_do_cleanup_dma( dev );
+ return DRM_ERR(ENOMEM);
+ }
+
+ /* Make dev_private visable to others. */
+ dev->dev_private = (void *)dev_priv;
+ return 0;
+}
+
+static int mga_do_cleanup_dma( drm_device_t *dev )
+{
+ DRM_DEBUG( "\n" );
+
+ /* Make sure interrupts are disabled here because the uninstall ioctl
+ * may not have been called from userspace and after dev_private
+ * is freed, it's too late.
+ */
+ if ( dev->irq_enabled ) drm_irq_uninstall(dev);
+
+ if ( dev->dev_private ) {
+ drm_mga_private_t *dev_priv = dev->dev_private;
+
+ if ( dev_priv->warp != NULL )
+ drm_core_ioremapfree( dev_priv->warp, dev );
+ if ( dev_priv->primary != NULL )
+ drm_core_ioremapfree( dev_priv->primary, dev );
+ if ( dev->agp_buffer_map != NULL )
+ drm_core_ioremapfree( dev->agp_buffer_map, dev );
+
+ if ( dev_priv->head != NULL ) {
+ mga_freelist_cleanup( dev );
+ }
+
+ drm_free( dev->dev_private, sizeof(drm_mga_private_t),
+ DRM_MEM_DRIVER );
+ dev->dev_private = NULL;
+ }
+
+ return 0;
+}
+
+int mga_dma_init( DRM_IOCTL_ARGS )
+{
+ DRM_DEVICE;
+ drm_mga_init_t init;
+
+ LOCK_TEST_WITH_RETURN( dev, filp );
+
+ DRM_COPY_FROM_USER_IOCTL( init, (drm_mga_init_t __user *)data, sizeof(init) );
+
+ switch ( init.func ) {
+ case MGA_INIT_DMA:
+ return mga_do_init_dma( dev, &init );
+ case MGA_CLEANUP_DMA:
+ return mga_do_cleanup_dma( dev );
+ }
+
+ return DRM_ERR(EINVAL);
+}
+
+
+/* ================================================================
+ * Primary DMA stream management
+ */
+
+int mga_dma_flush( DRM_IOCTL_ARGS )
+{
+ DRM_DEVICE;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ drm_lock_t lock;
+
+ LOCK_TEST_WITH_RETURN( dev, filp );
+
+ DRM_COPY_FROM_USER_IOCTL( lock, (drm_lock_t __user *)data, sizeof(lock) );
+
+ DRM_DEBUG( "%s%s%s\n",
+ (lock.flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
+ (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
+ (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "" );
+
+ WRAP_WAIT_WITH_RETURN( dev_priv );
+
+ if ( lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL) ) {
+ mga_do_dma_flush( dev_priv );
+ }
+
+ if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
+#if MGA_DMA_DEBUG
+ int ret = mga_do_wait_for_idle( dev_priv );
+ if ( ret < 0 )
+ DRM_INFO( "%s: -EBUSY\n", __FUNCTION__ );
+ return ret;
+#else
+ return mga_do_wait_for_idle( dev_priv );
+#endif
+ } else {
+ return 0;
+ }
+}
+
+int mga_dma_reset( DRM_IOCTL_ARGS )
+{
+ DRM_DEVICE;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+
+ LOCK_TEST_WITH_RETURN( dev, filp );
+
+ return mga_do_dma_reset( dev_priv );
+}
+
+
+/* ================================================================
+ * DMA buffer management
+ */
+
+static int mga_dma_get_buffers( DRMFILE filp,
+ drm_device_t *dev, drm_dma_t *d )
+{
+ drm_buf_t *buf;
+ int i;
+
+ for ( i = d->granted_count ; i < d->request_count ; i++ ) {
+ buf = mga_freelist_get( dev );
+ if ( !buf ) return DRM_ERR(EAGAIN);
+
+ buf->filp = filp;
+
+ if ( DRM_COPY_TO_USER( &d->request_indices[i],
+ &buf->idx, sizeof(buf->idx) ) )
+ return DRM_ERR(EFAULT);
+ if ( DRM_COPY_TO_USER( &d->request_sizes[i],
+ &buf->total, sizeof(buf->total) ) )
+ return DRM_ERR(EFAULT);
+
+ d->granted_count++;
+ }
+ return 0;
+}
+
+int mga_dma_buffers( DRM_IOCTL_ARGS )
+{
+ DRM_DEVICE;
+ drm_device_dma_t *dma = dev->dma;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ drm_dma_t __user *argp = (void __user *)data;
+ drm_dma_t d;
+ int ret = 0;
+
+ LOCK_TEST_WITH_RETURN( dev, filp );
+
+ DRM_COPY_FROM_USER_IOCTL( d, argp, sizeof(d) );
+
+ /* Please don't send us buffers.
+ */
+ if ( d.send_count != 0 ) {
+ DRM_ERROR( "Process %d trying to send %d buffers via drmDMA\n",
+ DRM_CURRENTPID, d.send_count );
+ return DRM_ERR(EINVAL);
+ }
+
+ /* We'll send you buffers.
+ */
+ if ( d.request_count < 0 || d.request_count > dma->buf_count ) {
+ DRM_ERROR( "Process %d trying to get %d buffers (of %d max)\n",
+ DRM_CURRENTPID, d.request_count, dma->buf_count );
+ return DRM_ERR(EINVAL);
+ }
+
+ WRAP_TEST_WITH_RETURN( dev_priv );
+
+ d.granted_count = 0;
+
+ if ( d.request_count ) {
+ ret = mga_dma_get_buffers( filp, dev, &d );
+ }
+
+ DRM_COPY_TO_USER_IOCTL( argp, d, sizeof(d) );
+
+ return ret;
+}
+
+void mga_driver_pretakedown(drm_device_t *dev)
+{
+ mga_do_cleanup_dma( dev );
+}
+
+int mga_driver_dma_quiescent(drm_device_t *dev)
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ return mga_do_wait_for_idle( dev_priv );
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.