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drm/i915: Add comments to explain the BSD tail write workaround 

Having had to dive into the bspec to understand what each stage of the
workaround meant, and how that the ring broadcasting IDLE corresponded
with the GT powering down the ring (i.e. rc6) add comments to aide
the next reader.

And since the register "is used to control all aspects of PSMI and power
saving functions" that makes it quite interesting to inspect with
regards to RC6 hangs, so add it to the error-state.

v2: Rediscover the piece of magic, set the RNCID to 0 before waiting for
the ring to wake up.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-07-05 17:14:01 +01:00 committed by Daniel Vetter
parent 67b1b57182
commit 12f55818ba
5 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -676,6 +676,7 @@ static void i915_ring_error_state(struct seq_file *m,
seq_printf(m, " INSTPM: 0x%08x\n", error->instpm[ring]);
seq_printf(m, " FADDR: 0x%08x\n", error->faddr[ring]);
if (INTEL_INFO(dev)->gen >= 6) {
seq_printf(m, " RC PSMI: 0x%08x\n", error->rc_psmi[ring]);
seq_printf(m, " FAULT_REG: 0x%08x\n", error->fault_reg[ring]);
seq_printf(m, " SYNC_0: 0x%08x\n",
error->semaphore_mboxes[ring][0]);

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -190,6 +190,7 @@ struct drm_i915_error_state {
u32 instdone[I915_NUM_RINGS];
u32 acthd[I915_NUM_RINGS];
u32 semaphore_mboxes[I915_NUM_RINGS][I915_NUM_RINGS - 1];
u32 rc_psmi[I915_NUM_RINGS]; /* sleep state */
/* our own tracking of ring head and tail */
u32 cpu_ring_head[I915_NUM_RINGS];
u32 cpu_ring_tail[I915_NUM_RINGS];

1
drivers/gpu/drm/i915/i915_irq.c
View File

@ -1067,6 +1067,7 @@ static void i915_record_ring_state(struct drm_device *dev,
struct drm_i915_private *dev_priv = dev->dev_private;
if (INTEL_INFO(dev)->gen >= 6) {
error->rc_psmi[ring->id] = I915_READ(ring->mmio_base + 0x50);
error->fault_reg[ring->id] = I915_READ(RING_FAULT_REG(ring));
error->semaphore_mboxes[ring->id][0]
= I915_READ(RING_SYNC_0(ring->mmio_base));

8
drivers/gpu/drm/i915/i915_reg.h
View File

@ -690,10 +690,10 @@
#define GEN6_BLITTER_FBC_NOTIFY (1<<3)
#define GEN6_BSD_SLEEP_PSMI_CONTROL 0x12050
#define GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK (1 << 16)
#define GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE (1 << 0)
#define GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE 0
#define GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR (1 << 3)
#define GEN6_BSD_SLEEP_MSG_DISABLE (1 << 0)
#define GEN6_BSD_SLEEP_FLUSH_DISABLE (1 << 2)
#define GEN6_BSD_SLEEP_INDICATOR (1 << 3)
#define GEN6_BSD_GO_INDICATOR (1 << 4)
#define GEN6_BSD_HWSTAM 0x12098
#define GEN6_BSD_IMR 0x120a8

29
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -1270,20 +1270,31 @@ static void gen6_bsd_ring_write_tail(struct intel_ring_buffer *ring,
drm_i915_private_t *dev_priv = ring->dev->dev_private;
/* Every tail move must follow the sequence below */
I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_DISABLE);
I915_WRITE(GEN6_BSD_RNCID, 0x0);
/* Disable notification that the ring is IDLE. The GT
* will then assume that it is busy and bring it out of rc6.
*/
I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
_MASKED_BIT_ENABLE(GEN6_BSD_SLEEP_MSG_DISABLE));
/* Clear the context id. Here be magic! */
I915_WRITE64(GEN6_BSD_RNCID, 0x0);
/* Wait for the ring not to be idle, i.e. for it to wake up. */
if (wait_for((I915_READ(GEN6_BSD_SLEEP_PSMI_CONTROL) &
GEN6_BSD_SLEEP_PSMI_CONTROL_IDLE_INDICATOR) == 0,
50))
DRM_ERROR("timed out waiting for IDLE Indicator\n");
GEN6_BSD_SLEEP_INDICATOR) == 0,
50))
DRM_ERROR("timed out waiting for the BSD ring to wake up\n");
/* Now that the ring is fully powered up, update the tail */
I915_WRITE_TAIL(ring, value);
POSTING_READ(RING_TAIL(ring->mmio_base));
/* Let the ring send IDLE messages to the GT again,
* and so let it sleep to conserve power when idle.
*/
I915_WRITE(GEN6_BSD_SLEEP_PSMI_CONTROL,
GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK |
GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_ENABLE);
_MASKED_BIT_DISABLE(GEN6_BSD_SLEEP_MSG_DISABLE));
}
static int gen6_ring_flush(struct intel_ring_buffer *ring,