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drm/i915: Add support for resetting the SO write pointers on gen7.

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These registers are automatically incremented by the hardware during
transform feedback to track where the next streamed vertex output
should go.  Unlike the previous generation, which had a packet for
setting the corresponding registers to a defined value, gen7 only has
MI_LOAD_REGISTER_IMM to do so.  That's a secure packet (since it loads
an arbitrary register), so we need to do it from the kernel, and it
needs to be settable atomically with the batchbuffer execution so that
two clients doing transform feedback don't stomp on each others'
state.

Instead of building a more complicated interface involcing setting the
registers to a specific value, just set them to 0 when asked and
userland can tweak its pointers accordingly.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Eric Anholt 2012-01-03 09:23:29 -08:00 committed by Keith Packard
parent e959b5db4a
commit ae662d3126
4 changed files with 44 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_dma.c
View File

@ -781,6 +781,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
case I915_PARAM_HAS_RELAXED_DELTA:
value = 1;
break;
case I915_PARAM_HAS_GEN7_SOL_RESET:
value = 1;
break;
default:
DRM_DEBUG_DRIVER("Unknown parameter %d\n",
param->param);

31
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@ -970,6 +970,31 @@ i915_gem_execbuffer_retire_commands(struct drm_device *dev,
}
}
static int
i915_reset_gen7_sol_offsets(struct drm_device *dev,
struct intel_ring_buffer *ring)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int ret, i;
if (!IS_GEN7(dev) || ring != &dev_priv->ring[RCS])
return 0;
ret = intel_ring_begin(ring, 4 * 3);
if (ret)
return ret;
for (i = 0; i < 4; i++) {
intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
intel_ring_emit(ring, GEN7_SO_WRITE_OFFSET(i));
intel_ring_emit(ring, 0);
}
intel_ring_advance(ring);
return 0;
}
static int
i915_gem_do_execbuffer(struct drm_device *dev, void *data,
struct drm_file *file,
@ -1184,6 +1209,12 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
dev_priv->relative_constants_mode = mode;
}
if (args->flags & I915_EXEC_GEN7_SOL_RESET) {
ret = i915_reset_gen7_sol_offsets(dev, ring);
if (ret)
goto err;
}
trace_i915_gem_ring_dispatch(ring, seqno);
exec_start = batch_obj->gtt_offset + args->batch_start_offset;

6
drivers/gpu/drm/i915/i915_reg.h
View File

@ -3736,4 +3736,10 @@
#define CPT_AUD_CNTL_ST_A 0xE50B4
#define CPT_AUD_CNTRL_ST2 0xE50C0
/* These are the 4 32-bit write offset registers for each stream
* output buffer. It determines the offset from the
* 3DSTATE_SO_BUFFERs that the next streamed vertex output goes to.
*/
#define GEN7_SO_WRITE_OFFSET(n) (0x5280 + (n) * 4)
#endif /* _I915_REG_H_ */

4
include/drm/i915_drm.h
View File

@ -295,6 +295,7 @@ typedef struct drm_i915_irq_wait {
#define I915_PARAM_HAS_COHERENT_RINGS 13
#define I915_PARAM_HAS_EXEC_CONSTANTS 14
#define I915_PARAM_HAS_RELAXED_DELTA 15
#define I915_PARAM_HAS_GEN7_SOL_RESET 16
typedef struct drm_i915_getparam {
int param;
@ -657,6 +658,9 @@ struct drm_i915_gem_execbuffer2 {
__u64 rsvd2;
};
/** Resets the SO write offset registers for transform feedback on gen7. */
#define I915_EXEC_GEN7_SOL_RESET (1<<8)
struct drm_i915_gem_pin {
/** Handle of the buffer to be pinned. */
__u32 handle;