MLK-23754-19 remoteproc: add rproc_memcpy

Some platforms has limitation using memcpy to/from memory
that will be used by remote processor.

To i.MX8 Chips, TCM memory not support 64bit access, and non 64bit
aligned access will cause issue.

So introduce rproc_memory to let driver could have their own memcpy
variants.

Reviewed-by: Richard Zhu <hongxing.zhu@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

drivers/remoteproc/remoteproc_core.c

@@ -71,6 +71,23 @@ static const char *rproc_crash_to_string(enum rproc_crash_type type)
 	return "unknown";
 }
 
+/*
+ * rproc_memcpy() - memcpy verison for remoteproc usage
+ * @flags:
+ *	- 0 means to DA
+ *	- 1 means from DA
+ *
+ */
+void *rproc_memcpy(struct rproc *rproc, void *dest,
+		   const void *src, size_t count, int flags)
+{
+	if (rproc->ops->memcpy)
+		return rproc->ops->memcpy(rproc, dest, src, count, flags);
+
+	return memcpy(dest, src, count);
+}
+EXPORT_SYMBOL(rproc_memcpy);
+
 /*
  * This is the IOMMU fault handler we register with the IOMMU API
  * (when relevant; not all remote processors access memory through
@@ -1642,7 +1659,8 @@ static void rproc_coredump(struct rproc *rproc)
 					&segment->da, segment->size);
 				memset(data + offset, 0xff, segment->size);
 			} else {
-				memcpy(data + offset, ptr, segment->size);
+				rproc_memcpy(rproc, data + offset, ptr,
+					     segment->size, 1);
 			}
 		}
 

drivers/remoteproc/remoteproc_elf_loader.c

@@ -183,7 +183,8 @@ int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
 
 		/* put the segment where the remote processor expects it */
 		if (phdr->p_filesz)
-			memcpy(ptr, elf_data + phdr->p_offset, filesz);
+			rproc_memcpy(rproc, ptr, elf_data + phdr->p_offset,
+				     filesz, 0);
 
 	}
 

drivers/remoteproc/remoteproc_internal.h

@@ -50,6 +50,8 @@ void rproc_exit_sysfs(void);
 void rproc_free_vring(struct rproc_vring *rvring);
 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
 
+void *rproc_memcpy(struct rproc *rproc, void *dest, const void *src,
+		   size_t count, int);
 void *rproc_da_to_va(struct rproc *rproc, u64 da, int len);
 phys_addr_t rproc_va_to_pa(void *cpu_addr);
 int rproc_trigger_recovery(struct rproc *rproc);

include/linux/remoteproc.h

@@ -383,6 +383,8 @@ struct rproc_ops {
 	int (*load)(struct rproc *rproc, const struct firmware *fw);
 	int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
 	u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
+	void * (*memcpy)(struct rproc *rproc, void *dest,
+			 const void *src, size_t count, int flags);
 };
 
 /**