[PATCH 2/8] remoteproc: Cache resource table size

From: Bjorn Andersson
Date: Wed Dec 13 2017 - 17:41:27 EST


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.

Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
drivers/remoteproc/remoteproc_core.c | 20 +++++++-------------
include/linux/remoteproc.h | 2 ++
2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 15e2c4530a0a..761268096fe0 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/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;
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 2d1058111e57..b72be13d773d 100644
--- a/include/linux/remoteproc.h
+++ b/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;
};
--
2.15.0