[PATCH 08/17] drm/amdgpu: Add PACKET3_RUN_CLEANER_SHADER for cleaner shader execution

[Alex Deucher]

From: Srinivasan Shanmugam <srinivasan.shanmugam at amd.com>

This commit adds the PACKET3_RUN_CLEANER_SHADER definition. This packet
is a command packet used to instruct the GPU to execute the cleaner
shader.

The cleaner shader is a piece of GPU code that is used to clear or
initialize certain GPU resources, such as Local Data Share (LDS), Vector
General Purpose Registers (VGPRs), and Scalar General Purpose Registers
(SGPRs). Clearing these resources is important for ensuring data
isolation between different workloads running on the GPU.

The PACKET3_RUN_CLEANER_SHADER packet is used to trigger the execution
of the cleaner shader on the GPU. The packet consists of a header
followed by a RESERVED field, which is programmed to zero. When the GPU
receives this packet, it fetches and executes the cleaner shader
instructions from the location specified in the packet.

The cleaner shader feature helps to enhances security and reliability by
preventing data leaks between workloads.

Cc: Christian König <christian.koenig at amd.com>
Cc: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/soc15d.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/soc15d.h b/drivers/gpu/drm/amd/amdgpu/soc15d.h
index e74e1983da53..b9cbeb389edc 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15d.h
+++ b/drivers/gpu/drm/amd/amdgpu/soc15d.h
@@ -413,6 +413,10 @@
 #              define PACKET3_QUERY_STATUS_DOORBELL_OFFSET(x)  ((x) << 2)
 #              define PACKET3_QUERY_STATUS_ENG_SEL(x)          ((x) << 25)
 
+#define PACKET3_RUN_CLEANER_SHADER                      0xD2
+/* 1. header
+ * 2. RESERVED [31:0]
+ */
 
 #define VCE_CMD_NO_OP		0x00000000
 #define VCE_CMD_END		0x00000001
-- 
2.46.0