[PATCH v9 4/7] remoteproc: core: Add TEE interface support for firmware release

Arnaud Pouliquen
2024-08-30T09:53:33Z

Add support for releasing remote processor firmware through
the Trusted Execution Environment (TEE) interface.

The tee_rproc_release_fw() function is called in the following cases:

- An error occurs in rproc_start() between the loading of the segments and
the start of the remote processor.
- When rproc_release_fw is called on error or after stopping the remote
processor.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
---
drivers/remoteproc/remoteproc_core.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 7694817f25d4..32052dedc149 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -29,6 +29,7 @@
#include <linux/debugfs.h>
#include <linux/rculist.h>
#include <linux/remoteproc.h>
+#include <linux/remoteproc_tee.h>
#include <linux/iommu.h>
#include <linux/idr.h>
#include <linux/elf.h>
@@ -1258,6 +1259,9 @@ static int rproc_alloc_registered_carveouts(struct rproc *rproc)

static void rproc_release_fw(struct rproc *rproc)
{
+ if (rproc->state == RPROC_OFFLINE && rproc->tee_interface)
+ tee_rproc_release_fw(rproc);
+
/* Free the copy of the resource table */
kfree(rproc->cached_table);
rproc->cached_table = NULL;
@@ -1348,7 +1352,7 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
if (ret) {
dev_err(dev, "failed to prepare subdevices for %s: %d\n",
rproc->name, ret);
- goto reset_table_ptr;
+ goto release_fw;
}

/* power up the remote processor */
@@ -1376,7 +1380,9 @@ static int rproc_start(struct rproc *rproc, const struct firmware *fw)
rproc->ops->stop(rproc);
unprepare_subdevices:
rproc_unprepare_subdevices(rproc);
-reset_table_ptr:
+release_fw:
+ if (rproc->tee_interface)
+ tee_rproc_release_fw(rproc);
rproc->table_ptr = rproc->cached_table;

return ret;
--
2.25.1