[PATCH] remoteproc: uclass: Modify uc_pdata->name to use combination of device name and device's parent name
MD Danish Anwar
danishanwar at ti.com
Fri Jul 19 10:59:08 CEST 2024
uc_pdata->name is populated from device tree property "remoteproc-name".
For those devcices that don't set "remoteproc-name", uc_pdata->name
falls back to dev->name.
If two devices have same name, this will result into uc_pdata->name not
being unique and rproc_init() will fail.
Fix this by using combination of dev->name and dev->parent->name instead
of using just the dev->name to populate uc_pdata->name.
Signed-off-by: MD Danish Anwar <danishanwar at ti.com>
---
Cc: Andrew Davis <afd at ti.com>
Failure Example:
In k3-am64-main.dtsi, both pru0_0 [1] and pru1_0 [2] will have
dev->name as "pru at 34000" although their parent name is different.
pru0_0 has dev->name as "pru at 34000" and parent name as "icssg at 30000000"
pru1_0 has dev->name as "pru at 34000" and parent name as "icssg at 30080000"
rproc_init() fails for pru1_0 as the the uc_pdata->name becomes same as the pru0_0.
More details on this issue can be found here [3]. It was suggested to use a
different combination if `dev->name` is not unique by Andrew Davis <afd at ti.com> [4]
Failure Logs:
rproc_pre_probe: 'pru at 34000': using fdt
rproc_pre_probe: 'pru at 34000': using fdt
rproc_pre_probe: pru at 34000 duplicate name 'pru at 34000'
_rproc_probe_dev: pru at 34000: Failed to initialize - -22
rproc_boot: rproc_init() failed: -22
To fix it, this commit uses combination of dev and dev's parent name.
After this commit,
pru0_0 uc->pdata->name = "pru at 34000:icssg at 30000000"
pru1_0 uc->pdata->name = "pru at 34000:icssg at 30080000"
Both the names are unique, thus rproc_init() succeeds.
[1] https://elixir.bootlin.com/u-boot/v2024.07-rc3/source/dts/upstream/src/arm64/ti/k3-am64-main.dtsi#L1276
[2] https://elixir.bootlin.com/u-boot/v2024.07-rc3/source/dts/upstream/src/arm64/ti/k3-am64-main.dtsi#L1417
[3] https://lore.kernel.org/all/5cda289f-1d14-41f6-84e3-ff1d1034be13@ti.com/
[4] https://lore.kernel.org/all/e48f5818-182c-47ab-b384-379659830d38@ti.com/
drivers/remoteproc/rproc-uclass.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/remoteproc/rproc-uclass.c b/drivers/remoteproc/rproc-uclass.c
index 3ba2b40dca..e550292dda 100644
--- a/drivers/remoteproc/rproc-uclass.c
+++ b/drivers/remoteproc/rproc-uclass.c
@@ -158,9 +158,15 @@ static int rproc_pre_probe(struct udevice *dev)
uc_pdata->driver_plat_data = pdata->driver_plat_data;
}
- /* Else try using device Name */
- if (!uc_pdata->name)
- uc_pdata->name = dev->name;
+ /* Else try using a combination of device Name and devices's parent's name */
+ if (!uc_pdata->name) {
+ int rproc_name_size = 256;
+ char *buf;
+
+ buf = malloc(rproc_name_size);
+ snprintf(buf, rproc_name_size, "%s-%s", dev->name, dev->parent->name);
+ uc_pdata->name = buf;
+ }
if (!uc_pdata->name) {
debug("Unnamed device!");
return -EINVAL;
--
2.34.1
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