static int i915_emit_irq(drm_device_t * dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
RING_LOCALS;
i915_kernel_lost_context(dev);
DRM_DEBUG("%s\n", __FUNCTION__);
dev_priv->sarea_priv->last_enqueue = ++dev_priv->counter;
if (dev_priv->counter > 0x7FFFFFFFUL)
dev_priv->sarea_priv->last_enqueue = dev_priv->counter = 1;
BEGIN_LP_RING(6);
OUT_RING(CMD_STORE_DWORD_IDX);
OUT_RING(20);
OUT_RING(dev_priv->counter);
OUT_RING(0);
OUT_RING(0);
OUT_RING(GFX_OP_USER_INTERRUPT);
ADVANCE_LP_RING();
return dev_priv->counter;
}
static int i915_emit_irq(drm_device_t * dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
u32 ret;
RING_LOCALS;
i915_kernel_lost_context(dev);
DRM_DEBUG("%s\n", __FUNCTION__);
ret = dev_priv->counter;
BEGIN_LP_RING(2);
OUT_RING(0);
OUT_RING(GFX_OP_USER_INTERRUPT);
ADVANCE_LP_RING();
return ret;
}
static int init_ring_common(struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = ring->dev->dev_private;
struct drm_i915_gem_object *obj = ring->obj;
u32 head;
/* Stop the ring if it's running. */
I915_WRITE_CTL(ring, 0);
I915_WRITE_HEAD(ring, 0);
ring->write_tail(ring, 0);
/* Initialize the ring. */
I915_WRITE_START(ring, obj->gtt_offset);
head = I915_READ_HEAD(ring) & HEAD_ADDR;
/* G45 ring initialization fails to reset head to zero */
if (head != 0) {
DRM_DEBUG_KMS("%s head not reset to zero "
"ctl %08x head %08x tail %08x start %08x\n",
ring->name,
I915_READ_CTL(ring),
I915_READ_HEAD(ring),
I915_READ_TAIL(ring),
I915_READ_START(ring));
I915_WRITE_HEAD(ring, 0);
if (I915_READ_HEAD(ring) & HEAD_ADDR) {
DRM_ERROR("failed to set %s head to zero "
"ctl %08x head %08x tail %08x start %08x\n",
ring->name,
I915_READ_CTL(ring),
I915_READ_HEAD(ring),
I915_READ_TAIL(ring),
I915_READ_START(ring));
}
}
I915_WRITE_CTL(ring,
((ring->size - PAGE_SIZE) & RING_NR_PAGES)
| RING_REPORT_64K | RING_VALID);
/* If the head is still not zero, the ring is dead */
if ((I915_READ_CTL(ring) & RING_VALID) == 0 ||
I915_READ_START(ring) != obj->gtt_offset ||
(I915_READ_HEAD(ring) & HEAD_ADDR) != 0) {
DRM_ERROR("%s initialization failed "
"ctl %08x head %08x tail %08x start %08x\n",
ring->name,
I915_READ_CTL(ring),
I915_READ_HEAD(ring),
I915_READ_TAIL(ring),
I915_READ_START(ring));
return -EIO;
}
if (!drm_core_check_feature(ring->dev, DRIVER_MODESET))
i915_kernel_lost_context(ring->dev);
else {
ring->head = I915_READ_HEAD(ring);
ring->tail = I915_READ_TAIL(ring) & TAIL_ADDR;
ring->space = ring_space(ring);
}
return 0;
}
/**
* i965_reset - reset chip after a hang
* @dev: drm device to reset
* @flags: reset domains
*
* Reset the chip. Useful if a hang is detected. Returns zero on successful
* reset or otherwise an error code.
*
* Procedure is fairly simple:
* - reset the chip using the reset reg
* - re-init context state
* - re-init hardware status page
* - re-init ring buffer
* - re-init interrupt state
* - re-init display
*/
int i965_reset(struct drm_device *dev, u8 flags)
{
drm_i915_private_t *dev_priv = dev->dev_private;
unsigned long timeout;
u8 gdrst;
/*
* We really should only reset the display subsystem if we actually
* need to
*/
bool need_display = true;
mutex_lock(&dev->struct_mutex);
/*
* Clear request list
*/
i915_gem_retire_requests(dev);
if (need_display)
i915_save_display(dev);
if (IS_I965G(dev) || IS_G4X(dev)) {
/*
* Set the domains we want to reset, then the reset bit (bit 0).
* Clear the reset bit after a while and wait for hardware status
* bit (bit 1) to be set
*/
pci_read_config_byte(dev->pdev, GDRST, &gdrst);
pci_write_config_byte(dev->pdev, GDRST, gdrst | flags | ((flags == GDRST_FULL) ? 0x1 : 0x0));
udelay(50);
pci_write_config_byte(dev->pdev, GDRST, gdrst & 0xfe);
/* ...we don't want to loop forever though, 500ms should be plenty */
timeout = jiffies + msecs_to_jiffies(500);
do {
udelay(100);
pci_read_config_byte(dev->pdev, GDRST, &gdrst);
} while ((gdrst & 0x1) && time_after(timeout, jiffies));
if (gdrst & 0x1) {
WARN(true, "i915: Failed to reset chip\n");
mutex_unlock(&dev->struct_mutex);
return -EIO;
}
} else {
DRM_ERROR("Error occurred. Don't know how to reset this chip.\n");
mutex_unlock(&dev->struct_mutex);
return -ENODEV;
}
/* Ok, now get things going again... */
/*
* Everything depends on having the GTT running, so we need to start
* there. Fortunately we don't need to do this unless we reset the
* chip at a PCI level.
*
* Next we need to restore the context, but we don't use those
* yet either...
*
* Ring buffer needs to be re-initialized in the KMS case, or if X
* was running at the time of the reset (i.e. we weren't VT
* switched away).
*/
if (drm_core_check_feature(dev, DRIVER_MODESET) ||
!dev_priv->mm.suspended) {
drm_i915_ring_buffer_t *ring = &dev_priv->ring;
struct drm_gem_object *obj = ring->ring_obj;
struct drm_i915_gem_object *obj_priv = obj->driver_private;
dev_priv->mm.suspended = 0;
/* Stop the ring if it's running. */
I915_WRITE(PRB0_CTL, 0);
I915_WRITE(PRB0_TAIL, 0);
I915_WRITE(PRB0_HEAD, 0);
/* Initialize the ring. */
I915_WRITE(PRB0_START, obj_priv->gtt_offset);
I915_WRITE(PRB0_CTL,
((obj->size - 4096) & RING_NR_PAGES) |
RING_NO_REPORT |
RING_VALID);
if (!drm_core_check_feature(dev, DRIVER_MODESET))
i915_kernel_lost_context(dev);
else {
ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
ring->tail = I915_READ(PRB0_TAIL) & TAIL_ADDR;
ring->space = ring->head - (ring->tail + 8);
if (ring->space < 0)
ring->space += ring->Size;
}
mutex_unlock(&dev->struct_mutex);
drm_irq_uninstall(dev);
drm_irq_install(dev);
mutex_lock(&dev->struct_mutex);
}
/*
* Display needs restore too...
*/
if (need_display)
i915_restore_display(dev);
mutex_unlock(&dev->struct_mutex);
return 0;
}
