drm/xe: Add sa/guc_buf_cache sync interface

In upcoming changes the cached buffers are going to be used to read data
produced by the GuC. Add a counterpart to flush, which synchronizes the
CPU-side of suballocation with the GPU data and propagate the interface
to GuC Buffer Cache.

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patch.msgid.link/20251112132220.516975-11-michal.winiarski@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_guc_buf.c b/drivers/gpu/drm/xe/xe_guc_buf.c
index 502ca3a4ee6064ab56eb9753d7d2ba032fce7827..4d8a4712309f4d02548141d49e6dc5038d056529 100644 (file)
--- a/drivers/gpu/drm/xe/xe_guc_buf.c
+++ b/drivers/gpu/drm/xe/xe_guc_buf.c
@@ -115,6 +115,19 @@ void xe_guc_buf_release(const struct xe_guc_buf buf)
                xe_sa_bo_free(buf.sa, NULL);
 }
 
+/**
+ * xe_guc_buf_sync_read() - Copy the data from the GPU memory to the sub-allocation.
+ * @buf: the &xe_guc_buf to sync
+ *
+ * Return: a CPU pointer of the sub-allocation.
+ */
+void *xe_guc_buf_sync_read(const struct xe_guc_buf buf)
+{
+       xe_sa_bo_sync_read(buf.sa);
+
+       return xe_sa_bo_cpu_addr(buf.sa);
+}
+
 /**
  * xe_guc_buf_flush() - Copy the data from the sub-allocation to the GPU memory.
  * @buf: the &xe_guc_buf to flush

diff --git a/drivers/gpu/drm/xe/xe_guc_buf.h b/drivers/gpu/drm/xe/xe_guc_buf.h
index 0d67604d96bdd7fd84766ab8ed2322324b77bb36..c5e0f1fd24d7462d01af4c2b924bcc38661fca90 100644 (file)
--- a/drivers/gpu/drm/xe/xe_guc_buf.h
+++ b/drivers/gpu/drm/xe/xe_guc_buf.h
@@ -30,6 +30,7 @@ static inline bool xe_guc_buf_is_valid(const struct xe_guc_buf buf)
 }
 
 void *xe_guc_buf_cpu_ptr(const struct xe_guc_buf buf);
+void *xe_guc_buf_sync_read(const struct xe_guc_buf buf);
 u64 xe_guc_buf_flush(const struct xe_guc_buf buf);
 u64 xe_guc_buf_gpu_addr(const struct xe_guc_buf buf);
 u64 xe_guc_cache_gpu_addr_from_ptr(struct xe_guc_buf_cache *cache, const void *ptr, u32 size);

diff --git a/drivers/gpu/drm/xe/xe_sa.c b/drivers/gpu/drm/xe/xe_sa.c
index fedd017d6dd36a0585fa33464e89d210cc59deba..63a5263dcf1b18837504e6145fe9d651c650f6f5 100644 (file)
--- a/drivers/gpu/drm/xe/xe_sa.c
+++ b/drivers/gpu/drm/xe/xe_sa.c
@@ -110,6 +110,10 @@ struct drm_suballoc *__xe_sa_bo_new(struct xe_sa_manager *sa_manager, u32 size,
        return drm_suballoc_new(&sa_manager->base, size, gfp, true, 0);
 }
 
+/**
+ * xe_sa_bo_flush_write() - Copy the data from the sub-allocation to the GPU memory.
+ * @sa_bo: the &drm_suballoc to flush
+ */
 void xe_sa_bo_flush_write(struct drm_suballoc *sa_bo)
 {
        struct xe_sa_manager *sa_manager = to_xe_sa_manager(sa_bo->manager);
@@ -123,6 +127,23 @@ void xe_sa_bo_flush_write(struct drm_suballoc *sa_bo)
                         drm_suballoc_size(sa_bo));
 }
 
+/**
+ * xe_sa_bo_sync_read() - Copy the data from GPU memory to the sub-allocation.
+ * @sa_bo: the &drm_suballoc to sync
+ */
+void xe_sa_bo_sync_read(struct drm_suballoc *sa_bo)
+{
+       struct xe_sa_manager *sa_manager = to_xe_sa_manager(sa_bo->manager);
+       struct xe_device *xe = tile_to_xe(sa_manager->bo->tile);
+
+       if (!sa_manager->bo->vmap.is_iomem)
+               return;
+
+       xe_map_memcpy_from(xe, xe_sa_bo_cpu_addr(sa_bo), &sa_manager->bo->vmap,
+                          drm_suballoc_soffset(sa_bo),
+                          drm_suballoc_size(sa_bo));
+}
+
 void xe_sa_bo_free(struct drm_suballoc *sa_bo,
                   struct dma_fence *fence)
 {

diff --git a/drivers/gpu/drm/xe/xe_sa.h b/drivers/gpu/drm/xe/xe_sa.h
index 99dbf0eea54025112dfe756f22c343962248c4cf..1be74435083618b34b5a85a503b4c933e505605b 100644 (file)
--- a/drivers/gpu/drm/xe/xe_sa.h
+++ b/drivers/gpu/drm/xe/xe_sa.h
@@ -37,6 +37,7 @@ static inline struct drm_suballoc *xe_sa_bo_new(struct xe_sa_manager *sa_manager
 }
 
 void xe_sa_bo_flush_write(struct drm_suballoc *sa_bo);
+void xe_sa_bo_sync_read(struct drm_suballoc *sa_bo);
 void xe_sa_bo_free(struct drm_suballoc *sa_bo, struct dma_fence *fence);
 
 static inline struct xe_sa_manager *