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path: root/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
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Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c29
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