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drm/radeon: Enable sdma preemption 

This patch adds to radeon the enablement of sdma preemption.
This is needed to support HWS of SDMA user-mode queues.

Signed-off-by: Ben Goz <ben.goz@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ben Goz 2015-01-03 22:12:35 +02:00 committed by Oded Gabbay
parent 85dfaef341
commit d7a60d8ea5
1 changed files with 29 additions and 0 deletions
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29
drivers/gpu/drm/radeon/cik_sdma.c
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@ -282,6 +282,33 @@ static void cik_sdma_rlc_stop(struct radeon_device *rdev)
/* XXX todo */
}
/**
* cik_sdma_ctx_switch_enable - enable/disable sdma engine preemption
*
* @rdev: radeon_device pointer
* @enable: enable/disable preemption.
*
* Halt or unhalt the async dma engines (CIK).
*/
void cik_sdma_ctx_switch_enable(struct radeon_device *rdev, bool enable)
{
uint32_t reg_offset, value;
int i;
for (i = 0; i < 2; i++) {
if (i == 0)
reg_offset = SDMA0_REGISTER_OFFSET;
else
reg_offset = SDMA1_REGISTER_OFFSET;
value = RREG32(SDMA0_CNTL + reg_offset);
if (enable)
value |= AUTO_CTXSW_ENABLE;
else
value &= ~AUTO_CTXSW_ENABLE;
WREG32(SDMA0_CNTL + reg_offset, value);
}
}
/**
* cik_sdma_enable - stop the async dma engines
*
@ -312,6 +339,8 @@ void cik_sdma_enable(struct radeon_device *rdev, bool enable)
me_cntl |= SDMA_HALT;
WREG32(SDMA0_ME_CNTL + reg_offset, me_cntl);
}
cik_sdma_ctx_switch_enable(rdev, enable);
}
/**