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Date: Wed, 16 Aug 2023 11:27:32 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: Oleksii Moisieiev <Oleksii_Moisieiev@...m.com>
Cc: "sudeep.holla@....com" <sudeep.holla@....com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v4 1/4] firmware: arm_scmi: Add optional flags to
extended names helper
On Tue, Aug 08, 2023 at 06:25:35PM +0000, Oleksii Moisieiev wrote:
> From: Cristian Marussi <cristian.marussi@....com>
>
> Some recently added SCMI protocols needs an additional flags parameter to
> be able to properly configure the command used to query the extended name
> of a resource.
>
Hi Oleksii,
> Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> ---
You need to apply also your Signed-off as last in V5 for this to be
accepted AND beside this I spotted a bug while re-testing this. (my bad)
See down below a possible fix.
> drivers/firmware/arm_scmi/clock.c | 2 +-
> drivers/firmware/arm_scmi/driver.c | 7 +++++--
> drivers/firmware/arm_scmi/perf.c | 3 ++-
> drivers/firmware/arm_scmi/power.c | 2 +-
> drivers/firmware/arm_scmi/powercap.c | 2 +-
> drivers/firmware/arm_scmi/protocols.h | 3 ++-
> drivers/firmware/arm_scmi/reset.c | 3 ++-
> drivers/firmware/arm_scmi/sensors.c | 2 +-
> drivers/firmware/arm_scmi/voltage.c | 2 +-
> 9 files changed, 16 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
> index 96060bf90a24..e6e087686e8c 100644
> --- a/drivers/firmware/arm_scmi/clock.c
> +++ b/drivers/firmware/arm_scmi/clock.c
> @@ -169,7 +169,7 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
> if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x2) {
> if (SUPPORTS_EXTENDED_NAMES(attributes))
> ph->hops->extended_name_get(ph, CLOCK_NAME_GET, clk_id,
> - clk->name,
> + NULL, clk->name,
> SCMI_MAX_STR_SIZE);
>
> if (SUPPORTS_RATE_CHANGED_NOTIF(attributes))
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index e7d97b59963b..729201d8f935 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -1438,6 +1438,7 @@ struct scmi_msg_resp_domain_name_get {
> * @ph: A protocol handle reference.
> * @cmd_id: The specific command ID to use.
> * @res_id: The specific resource ID to use.
> + * @flags: A pointer to specific flags to use, if any.
> * @name: A pointer to the preallocated area where the retrieved name will be
> * stored as a NULL terminated string.
> * @len: The len in bytes of the @name char array.
> @@ -1445,8 +1446,8 @@ struct scmi_msg_resp_domain_name_get {
> * Return: 0 on Succcess
> */
> static int scmi_common_extended_name_get(const struct scmi_protocol_handle *ph,
> - u8 cmd_id, u32 res_id, char *name,
> - size_t len)
> + u8 cmd_id, u32 res_id, u32 *flags,
> + char *name, size_t len)
> {
> int ret;
> struct scmi_xfer *t;
> @@ -1458,6 +1459,8 @@ static int scmi_common_extended_name_get(const struct scmi_protocol_handle *ph,
> goto out;
>
> put_unaligned_le32(res_id, t->tx.buf);
> + if (flags)
> + put_unaligned_le32(*flags, t->tx.buf + sizeof(res_id));
> resp = t->rx.buf;
>
> ret = ph->xops->do_xfer(ph, t);
Here my patch is buggy since when you provide the optional flags they
are after the res_id parameter BUT the previous xfer_get_init still
requires an xfer with a tx_len size of sizeof(res_id) ONLY, so while the
flags will fit into tx.buf that second optional flags field won't be
sent because the core SCMI stack will see t->tx.len == 4 :<
(so this flags extension wont work when needed in Pinctrl)
A possible fix that I tested consist in changing this snippet with:
-->8---
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index b5957cc12fee..06c101edba7f 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -1438,6 +1438,7 @@ struct scmi_msg_resp_domain_name_get {
* @ph: A protocol handle reference.
* @cmd_id: The specific command ID to use.
* @res_id: The specific resource ID to use.
+ * @flags: A pointer to specific flags to use, if any.
* @name: A pointer to the preallocated area where the retrieved name will be
* stored as a NULL terminated string.
* @len: The len in bytes of the @name char array.
@@ -1445,19 +1446,22 @@ struct scmi_msg_resp_domain_name_get {
* Return: 0 on Succcess
*/
static int scmi_common_extended_name_get(const struct scmi_protocol_handle *ph,
- u8 cmd_id, u32 res_id, char *name,
- size_t len)
+ u8 cmd_id, u32 res_id, u32 *flags,
+ char *name, size_t len)
{
int ret;
+ size_t txlen;
struct scmi_xfer *t;
struct scmi_msg_resp_domain_name_get *resp;
- ret = ph->xops->xfer_get_init(ph, cmd_id, sizeof(res_id),
- sizeof(*resp), &t);
+ txlen = !flags ? sizeof(res_id) : sizeof(res_id) + sizeof(*flags);
+ ret = ph->xops->xfer_get_init(ph, cmd_id, txlen, sizeof(*resp), &t);
if (ret)
goto out;
put_unaligned_le32(res_id, t->tx.buf);
+ if (flags)
+ put_unaligned_le32(*flags, t->tx.buf + sizeof(res_id));
resp = t->rx.buf;
ret = ph->xops->do_xfer(ph, t);
---8<---
My bad,
Thanks,
Cristian
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