Used to get the size and alignment requirements for
the gfx shadow buffer for preemption.

v2: use FW version check to determine whether to
    return a valid size here
    return an error if not supported (Alex)

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c | 27 ++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c 
b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
index 1fc1e941f7df..d6aeaf530fe2 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v11_0.c
@@ -822,6 +822,32 @@ static void gfx_v11_0_select_me_pipe_q(struct 
amdgpu_device *adev,
        soc21_grbm_select(adev, me, pipe, q, vm);
 }
 
+/* all sizes are in bytes */
+#define MQD_SHADOW_BASE_SIZE      73728
+#define MQD_SHADOW_BASE_ALIGNMENT 256
+#define MQD_FWWORKAREA_SIZE       484
+#define MQD_FWWORKAREA_ALIGNMENT  256
+
+static int gfx_v11_0_get_gfx_shadow_info(struct amdgpu_device *adev,
+                                        struct amdgpu_gfx_shadow_info 
*shadow_info)
+{
+       if (shadow_info) {
+               if (adev->gfx.cp_gfx_shadow) {
+                       shadow_info->shadow_size = MQD_SHADOW_BASE_SIZE;
+                       shadow_info->shadow_alignment = 
MQD_SHADOW_BASE_ALIGNMENT;
+                       shadow_info->csa_size = MQD_FWWORKAREA_SIZE;
+                       shadow_info->csa_alignment = MQD_FWWORKAREA_ALIGNMENT;
+                       shadow_info->gds_size = 0x1000;
+                       shadow_info->gds_alignment = 256;
+                       return 0;
+               } else {
+                       memset(shadow_info, 0, sizeof(struct 
amdgpu_gfx_shadow_info));
+                       return -ENOTSUPP;
+               }
+       }
+       return -EINVAL;
+}
+
 static const struct amdgpu_gfx_funcs gfx_v11_0_gfx_funcs = {
        .get_gpu_clock_counter = &gfx_v11_0_get_gpu_clock_counter,
        .select_se_sh = &gfx_v11_0_select_se_sh,
@@ -830,6 +856,7 @@ static const struct amdgpu_gfx_funcs gfx_v11_0_gfx_funcs = {
        .read_wave_vgprs = &gfx_v11_0_read_wave_vgprs,
        .select_me_pipe_q = &gfx_v11_0_select_me_pipe_q,
        .update_perfmon_mgcg = &gfx_v11_0_update_perf_clk,
+       .get_gfx_shadow_info = &gfx_v11_0_get_gfx_shadow_info,
 };
 
 static int gfx_v11_0_gpu_early_init(struct amdgpu_device *adev)
-- 
2.39.2

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