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drm/shared/i915_dma.c

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/* i915_dma.c -- DMA support for the I915 -*- linux-c -*-
*/
/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
**************************************************************************/
#define __NO_VERSION__
#include "i915.h"
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
static void i915_print_status_page(drm_device_t *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
u32 *temp = dev_priv->hw_status_page;
if (!temp) {
DRM_DEBUG("no status page\n");
return;
}
DRM_DEBUG( "hw_status: Interrupt Status : %x\n", temp[0]);
DRM_DEBUG( "hw_status: LpRing Head ptr : %x\n", temp[1]);
DRM_DEBUG( "hw_status: IRing Head ptr : %x\n", temp[2]);
DRM_DEBUG( "hw_status: Reserved : %x\n", temp[3]);
DRM_DEBUG( "hw_status: Driver Counter : %d\n", temp[5]);
}
/* Really want an OS-independent resettable timer. Would like to have
* this loop run for (eg) 3 sec, but have the timer reset every time
* the head pointer changes, so that EBUSY only happens if the ring
* actually stalls for (eg) 3 seconds.
*/
int i915_wait_ring( drm_device_t *dev, int n, const char *caller )
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_ring_buffer_t *ring = &(dev_priv->ring);
u32 last_head = I915_READ(LP_RING + RING_HEAD) & HEAD_ADDR;
int i;
for ( i = 0 ; i < 10000 ; i++ ) {
ring->head = I915_READ(LP_RING + RING_HEAD) & HEAD_ADDR;
ring->space = ring->head - (ring->tail+8);
if (ring->space < 0) ring->space += ring->Size;
if ( ring->space >= n )
return 0;
dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
if (ring->head != last_head)
i = 0;
last_head = ring->head;
}
return DRM_ERR(EBUSY);
}
void i915_kernel_lost_context(drm_device_t *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_ring_buffer_t *ring = &(dev_priv->ring);
ring->head = I915_READ(LP_RING + RING_HEAD) & HEAD_ADDR;
ring->tail = I915_READ(LP_RING + RING_TAIL) & TAIL_ADDR;
ring->space = ring->head - (ring->tail+8);
if (ring->space < 0) ring->space += ring->Size;
if (ring->head == ring->tail)
dev_priv->sarea_priv->perf_boxes |= I915_BOX_RING_EMPTY;
}
int i915_cleanup(drm_device_t *dev)
{
/* 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) DRM(irq_uninstall)(dev);
if (dev->dev_private) {
drm_i915_private_t *dev_priv =
(drm_i915_private_t *) dev->dev_private;
if (dev_priv->ring.virtual_start) {
DRM_IOREMAPFREE( &dev_priv->ring.map, dev);
}
if (dev_priv->hw_status_page) {
pci_free_consistent(dev->pdev, PAGE_SIZE,
dev_priv->hw_status_page,
dev_priv->dma_status_page);
/* Need to rewrite hardware status page */
I915_WRITE(0x02080, 0x1ffff000);
}
DRM(free)(dev->dev_private, sizeof(drm_i915_private_t),
DRM_MEM_DRIVER);
dev->dev_private = NULL;
}
return 0;
}
static int i915_initialize(drm_device_t *dev,
drm_i915_private_t *dev_priv,
drm_i915_init_t *init)
{
memset(dev_priv, 0, sizeof(drm_i915_private_t));
DRM_GETSAREA();
if(!dev_priv->sarea) {
DRM_ERROR("can not find sarea!\n");
dev->dev_private = (void *)dev_priv;
i915_cleanup(dev);
return DRM_ERR(EINVAL);
}
DRM_FIND_MAP( dev_priv->mmio_map, init->mmio_offset );
if(!dev_priv->mmio_map) {
dev->dev_private = (void *)dev_priv;
i915_cleanup(dev);
DRM_ERROR("can not find mmio map!\n");
return DRM_ERR(EINVAL);
}
dev_priv->sarea_priv = (drm_i915_sarea_t *)
((u8 *)dev_priv->sarea->handle +
init->sarea_priv_offset);
dev_priv->ring.Start = init->ring_start;
dev_priv->ring.End = init->ring_end;
dev_priv->ring.Size = init->ring_size;
dev_priv->ring.tail_mask = dev_priv->ring.Size - 1;
dev_priv->ring.map.offset = init->ring_start;
dev_priv->ring.map.size = init->ring_size;
dev_priv->ring.map.type = 0;
dev_priv->ring.map.flags = 0;
dev_priv->ring.map.mtrr = 0;
DRM_IOREMAP( &dev_priv->ring.map, dev );
if (dev_priv->ring.map.handle == NULL) {
dev->dev_private = (void *) dev_priv;
i915_cleanup(dev);
DRM_ERROR("can not ioremap virtual address for"
" ring buffer\n");
return DRM_ERR(ENOMEM);
}
dev_priv->ring.virtual_start = dev_priv->ring.map.handle;
dev_priv->back_offset = init->back_offset;
dev_priv->front_offset = init->front_offset;
dev_priv->current_page = 0;
dev_priv->sarea_priv->pf_current_page = dev_priv->current_page;
/* We are using separate values as placeholders for mechanisms for
* private backbuffer/depthbuffer usage.
*/
dev_priv->use_mi_batchbuffer_start = 0;
/* Allow hardware batchbuffers unless told otherwise.
*/
dev_priv->allow_batchbuffer = 1;
/* Program Hardware Status Page */
dev_priv->hw_status_page =
pci_alloc_consistent( dev->pdev, PAGE_SIZE,
&dev_priv->dma_status_page );
if (!dev_priv->hw_status_page) {
dev->dev_private = (void *)dev_priv;
i915_cleanup(dev);
DRM_ERROR("Can not allocate hardware status page\n");
return DRM_ERR(ENOMEM);
}
memset(dev_priv->hw_status_page, 0, PAGE_SIZE);
DRM_DEBUG("hw status page @ %p\n", dev_priv->hw_status_page);
I915_WRITE(0x02080, dev_priv->dma_status_page);
DRM_DEBUG("Enabled hardware status page\n");
dev->dev_private = (void *)dev_priv;
return 0;
}
static int i915_resume(drm_device_t *dev)
{
drm_i915_private_t *dev_priv =
(drm_i915_private_t *) dev->dev_private;
DRM_DEBUG( "%s\n", __FUNCTION__);
if(!dev_priv->sarea) {
DRM_ERROR("can not find sarea!\n");
return DRM_ERR(EINVAL);
}
if(!dev_priv->mmio_map) {
DRM_ERROR("can not find mmio map!\n");
return DRM_ERR(EINVAL);
}
if (dev_priv->ring.map.handle == NULL) {
DRM_ERROR("can not ioremap virtual address for"
" ring buffer\n");
return DRM_ERR(ENOMEM);
}
/* Program Hardware Status Page */
if (!dev_priv->hw_status_page) {
DRM_ERROR("Can not find hardware status page\n");
return DRM_ERR(EINVAL);
}
DRM_DEBUG("hw status page @ %p\n", dev_priv->hw_status_page);
I915_WRITE(0x02080, dev_priv->dma_status_page);
DRM_DEBUG("Enabled hardware status page\n");
return 0;
}
int i915_dma_init( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv;
drm_i915_init_t init;
int retcode = 0;
DRM_COPY_FROM_USER_IOCTL( init, (drm_i915_init_t *)data, sizeof(init));
switch(init.func) {
case I915_INIT_DMA:
dev_priv = DRM(alloc)(sizeof(drm_i915_private_t),
DRM_MEM_DRIVER);
if(dev_priv == NULL)
return DRM_ERR(ENOMEM);
retcode = i915_initialize(dev, dev_priv, &init);
break;
case I915_CLEANUP_DMA:
retcode = i915_cleanup(dev);
break;
case I915_RESUME_DMA:
retcode = i915_resume(dev);
break;
default:
retcode = -EINVAL;
break;
}
return retcode;
}
/* Implement basically the same security restrictions as hardware does
* for MI_BATCH_NON_SECURE. These can be made stricter at any time.
*
* Most of the calculations below involve calculating the size of a
* particular instruction. It's important to get the size right as
* that tells us where the next instruction to check is. Any illegal
* instruction detected will be given a size of zero, which is a
* signal to abort the rest of the buffer.
*/
static int do_validate_cmd( int cmd )
{
switch (((cmd>>29) & 0x7)) {
case 0x0:
switch ((cmd>>23) & 0x3f) {
case 0x0:
return 1; /* MI_NOOP */
case 0x4:
return 1; /* MI_FLUSH */
default:
return 0; /* disallow everything else */
}
break;
case 0x1:
return 0; /* reserved */
case 0x2:
return (cmd & 0xff) + 2; /* 2d commands */
case 0x3:
if (((cmd>>24) & 0x1f) <= 0x18)
return 1;
switch ((cmd>>24) & 0x1f) {
case 0x1c:
return 1;
case 0x1d:
return (cmd & 0xffff) + 2;
case 0x1e:
if (cmd & (1<<23))
return (cmd & 0xffff) + 1;
else
return 1;
case 0x1f:
if ((cmd & (1<<23)) == 0) /* inline vertices */
return (cmd & 0x1ffff) + 2;
else if (cmd & (1<<17)) /* indirect random */
if ((cmd & 0xffff) == 0)
return 0; /* unknown length, too hard */
else
return (((cmd & 0xffff) + 1) / 2) + 1;
else
return 2; /* indirect sequential */
default:
return 0;
}
default:
return 0;
}
return 0;
}
static int validate_cmd( int cmd )
{
int ret = do_validate_cmd( cmd );
/* printk("validate_cmd( %x ): %d\n", cmd, ret); */
return ret;
}
static int i915_emit_cmds( drm_device_t *dev,
int *buffer,
int dwords )
{
drm_i915_private_t *dev_priv = dev->dev_private;
int i;
RING_LOCALS;
for (i = 0 ; i < dwords ; ) {
int cmd, sz;
if (DRM_COPY_FROM_USER_UNCHECKED(&cmd, &buffer[i], sizeof(cmd)))
return DRM_ERR( EINVAL );
/* printk("%d/%d ", i, dwords); */
if ((sz = validate_cmd(cmd)) == 0 || i + sz > dwords)
return DRM_ERR( EINVAL );
BEGIN_LP_RING( sz );
OUT_RING(cmd);
while (++i, --sz) {
if (DRM_COPY_FROM_USER_UNCHECKED( &cmd, &buffer[i],
sizeof(cmd))) {
return DRM_ERR( EINVAL );
}
OUT_RING(cmd);
}
ADVANCE_LP_RING();
}
return 0;
}
static int i915_emit_box( drm_device_t *dev,
drm_clip_rect_t *boxes,
int i,
int DR1,
int DR4)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_clip_rect_t box;
RING_LOCALS;
if (DRM_COPY_FROM_USER_UNCHECKED( &box, &boxes[i], sizeof(box) )) {
return EFAULT;
}
if (box.y2 <= box.y1 ||
box.x2 <= box.x1 ||
box.y2 <= 0 ||
box.x2 <= 0) {
DRM_ERROR("Bad box %d,%d..%d,%d\n",
box.x1, box.y1, box.x2, box.y2);
return DRM_ERR(EINVAL);
}
BEGIN_LP_RING(6);
OUT_RING( GFX_OP_DRAWRECT_INFO );
OUT_RING( DR1 );
OUT_RING( (box.x1 & 0xffff) | (box.y1<<16) );
OUT_RING( ((box.x2-1) & 0xffff) | ((box.y2-1)<<16) );
OUT_RING( DR4 );
OUT_RING( 0 );
ADVANCE_LP_RING();
return 0;
}
static int i915_dispatch_cmdbuffer(drm_device_t *dev,
drm_i915_cmdbuffer_t *cmd )
{
drm_i915_private_t *dev_priv = dev->dev_private;
int nbox = cmd->num_cliprects;
int i = 0, count, ret;
RING_LOCALS;
if (cmd->sz & 0x3) {
DRM_ERROR("alignment");
return DRM_ERR(EINVAL);
}
i915_kernel_lost_context(dev);
count = nbox ? nbox : 1;
for (i = 0 ; i < count ; i++) {
if (i < nbox) {
ret = i915_emit_box( dev, cmd->cliprects, i,
cmd->DR1, cmd->DR4);
if (ret)
return ret;
}
ret = i915_emit_cmds( dev, (int *)cmd->buf, cmd->sz / 4 );
if (ret)
return ret;
}
return 0;
}
static int i915_dispatch_batchbuffer(drm_device_t *dev,
drm_i915_batchbuffer_t *batch )
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_clip_rect_t box, *boxes = batch->cliprects;
int nbox = batch->num_cliprects;
int i = 0, count;
RING_LOCALS;
if ((batch->start | batch->used) & 0x7) {
DRM_ERROR("alignment");
return DRM_ERR(EINVAL);
}
i915_kernel_lost_context(dev);
count = nbox ? nbox : 1;
for (i = 0 ; i < count ; i++) {
if (i < nbox) {
int ret = i915_emit_box( dev, boxes, i,
batch->DR1, batch->DR4);
if (ret)
return ret;
}
if (dev_priv->use_mi_batchbuffer_start) {
BEGIN_LP_RING(2);
OUT_RING( MI_BATCH_BUFFER_START | (2<<6) );
OUT_RING( batch->start | MI_BATCH_NON_SECURE );
ADVANCE_LP_RING();
}
else {
BEGIN_LP_RING(4);
OUT_RING( MI_BATCH_BUFFER );
OUT_RING( batch->start | MI_BATCH_NON_SECURE );
OUT_RING( batch->start + batch->used - 4 );
OUT_RING( 0 );
ADVANCE_LP_RING();
}
}
dev_priv->sarea_priv->last_enqueue = dev_priv->counter++;
BEGIN_LP_RING(4);
OUT_RING( CMD_STORE_DWORD_IDX );
OUT_RING( 20 );
OUT_RING( dev_priv->counter );
OUT_RING( 0 );
ADVANCE_LP_RING();
return 0;
}
static int i915_dispatch_flip( drm_device_t *dev )
{
drm_i915_private_t *dev_priv = dev->dev_private;
RING_LOCALS;
DRM_DEBUG( "%s: page=%d pfCurrentPage=%d\n",
__FUNCTION__,
dev_priv->current_page,
dev_priv->sarea_priv->pf_current_page);
i915_kernel_lost_context(dev);
BEGIN_LP_RING( 2 );
OUT_RING( INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE );
OUT_RING( 0 );
ADVANCE_LP_RING();
BEGIN_LP_RING( 6 );
OUT_RING( CMD_OP_DISPLAYBUFFER_INFO | ASYNC_FLIP );
OUT_RING( 0 );
if ( dev_priv->current_page == 0 ) {
OUT_RING( dev_priv->back_offset );
dev_priv->current_page = 1;
} else {
OUT_RING( dev_priv->front_offset );
dev_priv->current_page = 0;
}
OUT_RING(0);
ADVANCE_LP_RING();
BEGIN_LP_RING( 2 );
OUT_RING( MI_WAIT_FOR_EVENT |
MI_WAIT_FOR_PLANE_A_FLIP );
OUT_RING( 0 );
ADVANCE_LP_RING();
dev_priv->sarea_priv->last_enqueue = dev_priv->counter++;
BEGIN_LP_RING(4);
OUT_RING( CMD_STORE_DWORD_IDX );
OUT_RING( 20 );
OUT_RING( dev_priv->counter );
OUT_RING( 0 );
ADVANCE_LP_RING();
dev_priv->sarea_priv->pf_current_page = dev_priv->current_page;
return 0;
}
static int i915_quiescent(drm_device_t *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
i915_kernel_lost_context(dev);
return i915_wait_ring( dev, dev_priv->ring.Size - 8, __FUNCTION__ );
}
int i915_flush_ioctl( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("i915_flush_ioctl called without lock held\n");
return DRM_ERR(EINVAL);
}
return i915_quiescent(dev);
}
int i915_batchbuffer( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv = (drm_i915_private_t *)dev->dev_private;
u32 *hw_status = dev_priv->hw_status_page;
drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
dev_priv->sarea_priv;
drm_i915_batchbuffer_t batch;
int ret;
if (!dev_priv->allow_batchbuffer) {
DRM_ERROR("Batchbuffer ioctl disabled\n");
return DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( batch, (drm_i915_batchbuffer_t *)data,
sizeof(batch) );
DRM_DEBUG("i915 batchbuffer, start %x used %d cliprects %d\n",
batch.start, batch.used, batch.num_cliprects);
if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("i915_batchbuffer called without lock held\n");
return DRM_ERR(EINVAL);
}
if (batch.num_cliprects && DRM_VERIFYAREA_READ(batch.cliprects,
batch.num_cliprects *
sizeof(drm_clip_rect_t)))
return DRM_ERR(EFAULT);
ret = i915_dispatch_batchbuffer( dev, &batch );
sarea_priv->last_dispatch = (int) hw_status[5];
return ret;
}
int i915_cmdbuffer( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv = (drm_i915_private_t *)dev->dev_private;
u32 *hw_status = dev_priv->hw_status_page;
drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
dev_priv->sarea_priv;
drm_i915_cmdbuffer_t cmdbuf;
int ret;
DRM_COPY_FROM_USER_IOCTL( cmdbuf, (drm_i915_cmdbuffer_t *)data,
sizeof(cmdbuf) );
DRM_DEBUG("i915 cmdbuffer, buf %p sz %d cliprects %d\n",
cmdbuf.buf, cmdbuf.sz, cmdbuf.num_cliprects);
if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("i915_cmdbuffer called without lock held\n");
return DRM_ERR(EINVAL);
}
if (cmdbuf.num_cliprects &&
DRM_VERIFYAREA_READ(cmdbuf.cliprects,
cmdbuf.num_cliprects *
sizeof(drm_clip_rect_t))) {
DRM_ERROR("Fault accessing cliprects\n");
return DRM_ERR(EFAULT);
}
ret = i915_dispatch_cmdbuffer( dev, &cmdbuf );
if (ret) {
DRM_ERROR("i915_dispatch_cmdbuffer failed\n");
return ret;
}
sarea_priv->last_dispatch = (int) hw_status[5];
return 0;
}
int i915_do_cleanup_pageflip( drm_device_t *dev )
{
drm_i915_private_t *dev_priv = dev->dev_private;
DRM_DEBUG("%s\n", __FUNCTION__);
if (dev_priv->current_page != 0)
i915_dispatch_flip( dev );
return 0;
}
int i915_flip_bufs( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
DRM_DEBUG("%s\n", __FUNCTION__);
if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("i915_flip_buf called without lock held\n");
return DRM_ERR(EINVAL);
}
return i915_dispatch_flip( dev );
}
int i915_getparam( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_getparam_t param;
int value;
if ( !dev_priv ) {
DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
return DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL(param, (drm_i915_getparam_t *)data,
sizeof(param));
switch( param.param ) {
case I915_PARAM_IRQ_ACTIVE:
value = dev->irq ? 1 : 0;
break;
case I915_PARAM_ALLOW_BATCHBUFFER:
value = dev_priv->allow_batchbuffer ? 1 : 0;
break;
default:
DRM_ERROR("Unkown parameter %d\n", param.param);
return DRM_ERR(EINVAL);
}
if ( DRM_COPY_TO_USER( param.value, &value, sizeof(int) ) ) {
DRM_ERROR("DRM_COPY_TO_USER failed\n");
return DRM_ERR(EFAULT);
}
return 0;
}
int i915_setparam( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_setparam_t param;
if ( !dev_priv ) {
DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
return DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( param, (drm_i915_setparam_t *)data,
sizeof(param) );
switch( param.param ) {
case I915_SETPARAM_USE_MI_BATCHBUFFER_START:
dev_priv->use_mi_batchbuffer_start = param.value;
break;
case I915_SETPARAM_TEX_LRU_LOG_GRANULARITY:
dev_priv->tex_lru_log_granularity = param.value;
break;
case I915_SETPARAM_ALLOW_BATCHBUFFER:
dev_priv->allow_batchbuffer = param.value;
break;
default:
DRM_ERROR("unknown parameter %d\n", param.param);
return DRM_ERR(EINVAL);
}
return 0;
}
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