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authorSuman Anna <s-anna@ti.com>2023-01-06 17:40:44 +0530
committerMathieu Poirier <mathieu.poirier@linaro.org>2023-01-06 09:15:19 -0700
commit2da812ffcd11c31ef897615798a8a66041a5b73b (patch)
tree4da2089ce605f4c58243c0e6275685b240495930 /drivers/remoteproc
parent919e8942548aa878d374b1b51aa68fdf751f18b8 (diff)
remoteproc: pru: Make sysfs entries read-only for PRU client driven boots
The PRU remoteproc driver is not configured for 'auto-boot' by default, and allows to be booted either by in-kernel PRU client drivers or by userspace using the generic remoteproc sysfs interfaces. The sysfs interfaces should not be permitted to change the remoteproc firmwares or states when a PRU is being managed by an in-kernel client driver. Use the newly introduced remoteproc generic 'sysfs_read_only' flag to provide these restrictions by setting and clearing it appropriately during the PRU acquire and release steps. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> Reviewed-by: Roger Quadros <rogerq@kernel.org> Link: https://lore.kernel.org/r/20230106121046.886863-5-danishanwar@ti.com Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/pru_rproc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
index 1036bfd446b6..c16242e2d435 100644
--- a/drivers/remoteproc/pru_rproc.c
+++ b/drivers/remoteproc/pru_rproc.c
@@ -223,6 +223,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
}
pru->client_np = np;
+ rproc->sysfs_read_only = true;
mutex_unlock(&pru->lock);
@@ -261,6 +262,7 @@ void pru_rproc_put(struct rproc *rproc)
}
pru->client_np = NULL;
+ rproc->sysfs_read_only = false;
mutex_unlock(&pru->lock);
rproc_put(rproc);