remoteproc: Cache resource table size

We don't re-read the resource table during a recovery, so it is possible
in the recovery path that the resource table has a different size than
cached_table. Store the original size of cached_table to avoid these
getting out of sync.
Reviewed-By: Loic Pallardy <loic.pallardy@st.com>
Tested-By: Loic Pallardy <loic.pallardy@st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/remoteproc/remoteproc_core.c

@@ -732,7 +732,7 @@ static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = {
 };
 
 /* handle firmware resource entries before booting the remote processor */
-static int rproc_handle_resources(struct rproc *rproc, int len,
+static int rproc_handle_resources(struct rproc *rproc,
 				  rproc_handle_resource_t handlers[RSC_LAST])
 {
 	struct device *dev = &rproc->dev;
@@ -742,7 +742,7 @@ static int rproc_handle_resources(struct rproc *rproc, int len,
 	for (i = 0; i < rproc->table_ptr->num; i++) {
 		int offset = rproc->table_ptr->offset[i];
 		struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset;
-		int avail = len - offset - sizeof(*hdr);
+		int avail = rproc->table_sz - offset - sizeof(*hdr);
 		void *rsc = (void *)hdr + sizeof(*hdr);
 
 		/* make sure table isn't truncated */
@@ -849,16 +849,9 @@ static void rproc_resource_cleanup(struct rproc *rproc)
 
 static int rproc_start(struct rproc *rproc, const struct firmware *fw)
 {
-	struct resource_table *table, *loaded_table;
+	struct resource_table *loaded_table;
 	struct device *dev = &rproc->dev;
-	int ret, tablesz;
-
-	/* look for the resource table */
-	table = rproc_find_rsc_table(rproc, fw, &tablesz);
-	if (!table) {
-		dev_err(dev, "Resource table look up failed\n");
-		return -EINVAL;
-	}
+	int ret;
 
 	/* load the ELF segments to memory */
 	ret = rproc_load_segments(rproc, fw);
@@ -877,7 +870,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
 	 */
 	loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
 	if (loaded_table) {
-		memcpy(loaded_table, rproc->cached_table, tablesz);
+		memcpy(loaded_table, rproc->cached_table, rproc->table_sz);
 		rproc->table_ptr = loaded_table;
 	}
 
@@ -951,12 +944,13 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 		goto clean_up;
 
 	rproc->table_ptr = rproc->cached_table;
+	rproc->table_sz = tablesz;
 
 	/* reset max_notifyid */
 	rproc->max_notifyid = -1;
 
 	/* handle fw resources which are required to boot rproc */
-	ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers);
+	ret = rproc_handle_resources(rproc, rproc_loading_handlers);
 	if (ret) {
 		dev_err(dev, "Failed to process resources: %d\n", ret);
 		goto clean_up_resources;

include/linux/remoteproc.h

@@ -410,6 +410,7 @@ enum rproc_crash_type {
  * @max_notifyid: largest allocated notify id.
  * @table_ptr: pointer to the resource table in effect
  * @cached_table: copy of the resource table
+ * @table_sz: size of @cached_table
  * @has_iommu: flag to indicate if remote processor is behind an MMU
  */
 struct rproc {
@@ -440,6 +441,7 @@ struct rproc {
 	int max_notifyid;
 	struct resource_table *table_ptr;
 	struct resource_table *cached_table;
+	size_t table_sz;
 	bool has_iommu;
 	bool auto_boot;
 };