drm/amdgpu/psp: don't free PSP buffers on suspend

We can reuse the same buffers on resume.

v2: squash in S4 fix from Shikai

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2213
Reviewed-by: Christian König <christian.koenig@amd.com>
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
index effa7df..7978307 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
@@ -172,6 +172,7 @@ void psp_ta_free_shared_buf(struct ta_mem_context *mem_ctx)
 {
        amdgpu_bo_free_kernel(&mem_ctx->shared_bo, &mem_ctx->shared_mc_addr,
                              &mem_ctx->shared_buf);
+       mem_ctx->shared_bo = NULL;
 }
 
 static void psp_free_shared_bufs(struct psp_context *psp)
@@ -182,6 +183,7 @@ static void psp_free_shared_bufs(struct psp_context *psp)
        /* free TMR memory buffer */
        pptr = amdgpu_sriov_vf(psp->adev) ? &tmr_buf : NULL;
        amdgpu_bo_free_kernel(&psp->tmr_bo, &psp->tmr_mc_addr, pptr);
+       psp->tmr_bo = NULL;
 
        /* free xgmi shared memory */
        psp_ta_free_shared_buf(&psp->xgmi_context.context.mem_context);
@@ -743,7 +745,7 @@ static int psp_load_toc(struct psp_context *psp,
 /* Set up Trusted Memory Region */
 static int psp_tmr_init(struct psp_context *psp)
 {
-       int ret;
+       int ret = 0;
        int tmr_size;
        void *tmr_buf;
        void **pptr;
@@ -770,10 +772,12 @@ static int psp_tmr_init(struct psp_context *psp)
                }
        }
 
-       pptr = amdgpu_sriov_vf(psp->adev) ? &tmr_buf : NULL;
-       ret = amdgpu_bo_create_kernel(psp->adev, tmr_size, PSP_TMR_ALIGNMENT,
-                                     AMDGPU_GEM_DOMAIN_VRAM,
-                                     &psp->tmr_bo, &psp->tmr_mc_addr, pptr);
+       if (!psp->tmr_bo) {
+               pptr = amdgpu_sriov_vf(psp->adev) ? &tmr_buf : NULL;
+               ret = amdgpu_bo_create_kernel(psp->adev, tmr_size, PSP_TMR_ALIGNMENT,
+                                             AMDGPU_GEM_DOMAIN_VRAM,
+                                             &psp->tmr_bo, &psp->tmr_mc_addr, pptr);
+       }
 
        return ret;
 }
@@ -2732,8 +2736,6 @@ static int psp_suspend(void *handle)
        }
 
 out:
-       psp_free_shared_bufs(psp);
-
        return ret;
 }