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charset="utf-8" On systems with multiple remote processors, the remoteproc device enumeration is not stable as it depends on the probe ordering. As a result, the /sys/class/remoteproc/remoteproc entries do not always refer to the same remote processor instance, which complicates userspace applications. Inspired by the SPI implementation, this commit allows board-specific numbering to be defined in device tree while still supporting dynamically registered remote processors. For instance, on STM32MP25 Soc this can be used by defining: aliases { rproc0 =3D &m33_rproc; rproc1 =3D &m0_rproc; }; When a "rproc" DT alias is present, use it to assign a fixed "/sys/class/remoteproc/remoteproc" entry. If no remoteproc alias is defined, keep the legacy index allocation. If only some remoteproc instances have an alias, allocate dynamic index starting after the highest alias index declared. Signed-off-by: Arnaud Pouliquen Tested-by: Peng Fan --- V3: - fix double space typo - add Peng Fan's Tested-by V2: - Introduces rproc_get_index based on Mathieu Poirier's suggestion. An update compared to Mathieu's version is that the call to ida_alloc_range is retained if an alias is found for the remote device, to balance with ida_free(). - Rename DT alias stem from "remoteproc" to "rproc" to be consistent with keytone driver. --- drivers/remoteproc/remoteproc_core.c | 40 ++++++++++++++++++++++++++-- include/linux/remoteproc.h | 3 +++ 2 files changed, 41 insertions(+), 2 deletions(-) diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remo= teproc_core.c index aada2780b343..4a02814c5d04 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -2433,6 +2433,43 @@ static int rproc_alloc_ops(struct rproc *rproc, cons= t struct rproc_ops *ops) return 0; } =20 +/** + * rproc_get_index - assign a unique device index for a remote processor + * @dev: device associated with the remote processor + * + * Look for a static index coming from the "rproc" DT alias + * (e.g. "rproc0"). If none is found, start allocating + * dynamic IDs after the highest alias in use. + * + * Return: a non-negative index on success, or a negative error code on fa= ilure. + */ +static int rproc_get_index(struct device *dev) +{ + int index; + + /* No DT to deal with */ + if (!dev->of_node) + goto legacy; + + /* See if an alias has been assigned to this remoteproc */ + index =3D of_alias_get_id(dev->of_node, RPROC_ALIAS); + if (index >=3D 0) + return ida_alloc_range(&rproc_dev_index, index, index, + GFP_KERNEL); + /* + * No alias has been assigned to this remoteproc device. See if any + * "rproc" aliases have been assigned and start allocating after + * the highest one if it is the case. + */ + index =3D of_alias_get_highest_id(RPROC_ALIAS); + if (index >=3D 0) + return ida_alloc_range(&rproc_dev_index, index + 1, ~0, + GFP_KERNEL); + +legacy: + return ida_alloc(&rproc_dev_index, GFP_KERNEL); +} + /** * rproc_alloc() - allocate a remote processor handle * @dev: the underlying device @@ -2481,8 +2518,7 @@ struct rproc *rproc_alloc(struct device *dev, const c= har *name, rproc->dev.driver_data =3D rproc; idr_init(&rproc->notifyids); =20 - /* Assign a unique device index and name */ - rproc->index =3D ida_alloc(&rproc_dev_index, GFP_KERNEL); + rproc->index =3D rproc_get_index(dev); if (rproc->index < 0) { dev_err(dev, "ida_alloc failed: %d\n", rproc->index); goto put_device; diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index b4795698d8c2..3feb2456ecc4 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -503,6 +503,9 @@ enum rproc_features { RPROC_MAX_FEATURES, }; 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charset="utf-8" The RPROC_ALIAS definition was introduced in remoteproc.h. Reuse it for of_alias_get_id()to to align alias handling across the code. Signed-off-by: Arnaud Pouliquen --- drivers/remoteproc/keystone_remoteproc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/remoteproc/keystone_remoteproc.c b/drivers/remoteproc/= keystone_remoteproc.c index 4d6550b48567..cf8288d17afd 100644 --- a/drivers/remoteproc/keystone_remoteproc.c +++ b/drivers/remoteproc/keystone_remoteproc.c @@ -378,7 +378,7 @@ static int keystone_rproc_probe(struct platform_device = *pdev) return -ENODEV; } =20 - dsp_id =3D of_alias_get_id(np, "rproc"); + dsp_id =3D of_alias_get_id(np, RPROC_ALIAS); if (dsp_id < 0) { dev_warn(dev, "device does not have an alias id\n"); return dsp_id; --=20 2.43.0