diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c index 111a301ce878..dcd9b4a8e20b 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c @@ -132,6 +132,35 @@ void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih) } /** + * amdgpu_ih_ring_write - write IV to the ring buffer + * + * @ih: ih ring to write to + * @iv: the iv to write + * @num_dw: size of the iv in dw + * + * Writes an IV to the ring buffer using the CPU and increment the wptr. + * Used for testing and delegating IVs to a software ring. + */ +void amdgpu_ih_ring_write(struct amdgpu_ih_ring *ih, const uint32_t *iv, + unsigned int num_dw) +{ + uint32_t wptr = le32_to_cpu(*ih->wptr_cpu) >> 2; + unsigned int i; + + for (i = 0; i < num_dw; ++i) + ih->ring[wptr++] = cpu_to_le32(iv[i]); + + wptr <<= 2; + wptr &= ih->ptr_mask; + + /* Only commit the new wptr if we don't overflow */ + if (wptr != READ_ONCE(ih->rptr)) { + wmb(); + WRITE_ONCE(*ih->wptr_cpu, cpu_to_le32(wptr)); + } +} + +/** * amdgpu_ih_process - interrupt handler * * @adev: amdgpu_device pointer |