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Message-ID: <88ee0a26-8d64-4060-b703-40156cd011a7@linaro.org>
Date: Thu, 28 Aug 2025 15:22:01 +0200
From: Casey Connolly <casey.connolly@...aro.org>
To: Shivendra Pratap <shivendra.pratap@....qualcomm.com>,
Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
Bjorn Andersson <andersson@...nel.org>, Sebastian Reichel <sre@...nel.org>,
Rob Herring <robh@...nel.org>, Sudeep Holla <sudeep.holla@....com>,
Souvik Chakravarty <Souvik.Chakravarty@....com>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
<conor+dt@...nel.org>, Andy Yan <andy.yan@...k-chips.com>,
Mark Rutland <mark.rutland@....com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>, Arnd Bergmann <arnd@...db.de>,
Konrad Dybcio <konradybcio@...nel.org>, cros-qcom-dts-watchers@...omium.org,
Vinod Koul <vkoul@...nel.org>, Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Florian Fainelli <florian.fainelli@...adcom.com>
Cc: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
Stephen Boyd <swboyd@...omium.org>, Andre Draszik
<andre.draszik@...aro.org>, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
Elliot Berman <quic_eberman@...cinc.com>,
Srinivas Kandagatla <srini@...nel.org>
Subject: Re: [PATCH v14 03/10] power: reset: reboot-mode: Add support for 64
bit magic
Hi Shivendra,
On 15/08/2025 16:35, Shivendra Pratap wrote:
> Current reboot-mode supports a single 32-bit argument for any
> supported mode. Some reboot-mode based drivers may require
> passing two independent 32-bit arguments during a reboot
> sequence, for uses-cases, where a mode requires an additional
> argument. Such drivers may not be able to use the reboot-mode
> driver. For example, ARM PSCI vendor-specific resets, need two
> arguments for its operation – reset_type and cookie, to complete
> the reset operation. If a driver wants to implement this
> firmware-based reset, it cannot use reboot-mode framework.
>
> Introduce 64-bit magic values in reboot-mode driver to
> accommodate dual 32-bit arguments when specified via device tree.
> In cases, where no second argument is passed from device tree,
> keep the upper 32-bit of magic un-changed(0) to maintain backward
> compatibility.
How about adding a n_magic_args property to struct reboot_mode_driver?
Then in struct mode_info change magic to be a u32 array of a fixed
length (currently two in-keeping with the DT bindings).
Parsing the DT values then gets simpler (u32_array) and the magic value
can be passed into the ->write() cb as a pointer since all the
reboot_mode drivers already know how big the array is. Unpopulated DT
values would just be 0.
Kind regards,
>
> Update the current drivers using reboot-mode for a 64-bit magic
> value.
>
> Signed-off-by: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
> ---
> drivers/power/reset/nvmem-reboot-mode.c | 13 +++++++++----
> drivers/power/reset/qcom-pon.c | 11 ++++++++---
> drivers/power/reset/reboot-mode.c | 19 +++++++++++++------
> drivers/power/reset/syscon-reboot-mode.c | 11 ++++++++---
> include/linux/reboot-mode.h | 3 ++-
> 5 files changed, 40 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/power/reset/nvmem-reboot-mode.c b/drivers/power/reset/nvmem-reboot-mode.c
> index 41530b70cfc48c2a83fbbd96f523d5816960a0d1..5d73dde585b1fd438b1847f884feb37cd9e4dd5c 100644
> --- a/drivers/power/reset/nvmem-reboot-mode.c
> +++ b/drivers/power/reset/nvmem-reboot-mode.c
> @@ -16,15 +16,20 @@ struct nvmem_reboot_mode {
> struct nvmem_cell *cell;
> };
>
> -static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot,
> - unsigned int magic)
> +static int nvmem_reboot_mode_write(struct reboot_mode_driver *reboot, u64 magic)
> {
> - int ret;
> struct nvmem_reboot_mode *nvmem_rbm;
> + u32 magic_32;
> + int ret;
> +
> + if (magic > U32_MAX)
> + return -EINVAL;
> +
> + magic_32 = magic;
>
> nvmem_rbm = container_of(reboot, struct nvmem_reboot_mode, reboot);
>
> - ret = nvmem_cell_write(nvmem_rbm->cell, &magic, sizeof(magic));
> + ret = nvmem_cell_write(nvmem_rbm->cell, &magic_32, sizeof(magic_32));
> if (ret < 0)
> dev_err(reboot->dev, "update reboot mode bits failed\n");
>
> diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
> index 7e108982a582e8243c5c806bd4a793646b87189f..d0ed9431a02313a7bbaa93743c16fa1ae713ddfe 100644
> --- a/drivers/power/reset/qcom-pon.c
> +++ b/drivers/power/reset/qcom-pon.c
> @@ -27,17 +27,22 @@ struct qcom_pon {
> long reason_shift;
> };
>
> -static int qcom_pon_reboot_mode_write(struct reboot_mode_driver *reboot,
> - unsigned int magic)
> +static int qcom_pon_reboot_mode_write(struct reboot_mode_driver *reboot, u64 magic)
> {
> struct qcom_pon *pon = container_of
> (reboot, struct qcom_pon, reboot_mode);
> + u32 magic_32;
> int ret;
>
> + if (magic > U32_MAX || (magic << pon->reason_shift) > U32_MAX)
> + return -EINVAL;
> +
> + magic_32 = magic << pon->reason_shift;
> +
> ret = regmap_update_bits(pon->regmap,
> pon->baseaddr + PON_SOFT_RB_SPARE,
> GENMASK(7, pon->reason_shift),
> - magic << pon->reason_shift);
> + magic_32);
> if (ret < 0)
> dev_err(pon->dev, "update reboot mode bits failed\n");
>
> diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
> index 9bb97bcd33cd3d58c75c791e9b568024e810e5b0..ac81b8b0a9b7fc31f8ef21024333a050087ce90f 100644
> --- a/drivers/power/reset/reboot-mode.c
> +++ b/drivers/power/reset/reboot-mode.c
> @@ -19,12 +19,11 @@
>
> struct mode_info {
> const char *mode;
> - u32 magic;
> + u64 magic;
> struct list_head list;
> };
>
> -static unsigned int get_reboot_mode_magic(struct reboot_mode_driver *reboot,
> - const char *cmd)
> +static u64 get_reboot_mode_magic(struct reboot_mode_driver *reboot, const char *cmd)
> {
> const char *normal = "normal";
> struct mode_info *info;
> @@ -66,7 +65,7 @@ static int reboot_mode_notify(struct notifier_block *this,
> unsigned long mode, void *cmd)
> {
> struct reboot_mode_driver *reboot;
> - unsigned int magic;
> + u64 magic;
>
> reboot = container_of(this, struct reboot_mode_driver, reboot_notifier);
> magic = get_reboot_mode_magic(reboot, cmd);
> @@ -89,6 +88,8 @@ int reboot_mode_register(struct reboot_mode_driver *reboot, struct device_node *
> struct mode_info *next;
> struct property *prop;
> size_t len = strlen(PREFIX);
> + u32 magic_arg1;
> + u32 magic_arg2;
> int ret;
>
> if (!np)
> @@ -108,12 +109,18 @@ int reboot_mode_register(struct reboot_mode_driver *reboot, struct device_node *
> goto error;
> }
>
> - if (of_property_read_u32(np, prop->name, &info->magic)) {
> - pr_err("reboot mode %s without magic number\n", info->mode);
> + if (of_property_read_u32(np, prop->name, &magic_arg1)) {
> + pr_err("reboot mode without magic number\n");
> kfree(info);
> continue;
> }
>
> + if (of_property_read_u32_index(np, prop->name, 1, &magic_arg2))
> + magic_arg2 = 0;
> +
> + info->magic = magic_arg2;
> + info->magic = (info->magic << 32) | magic_arg1;
> +
> info->mode = kstrdup_const(prop->name + len, GFP_KERNEL);
> if (!info->mode) {
> ret = -ENOMEM;
> diff --git a/drivers/power/reset/syscon-reboot-mode.c b/drivers/power/reset/syscon-reboot-mode.c
> index e0772c9f70f7a19cd8ec8a0b7fdbbaa7ba44afd0..3cbd000c512239b12ec51987e900d260540a9dea 100644
> --- a/drivers/power/reset/syscon-reboot-mode.c
> +++ b/drivers/power/reset/syscon-reboot-mode.c
> @@ -20,16 +20,21 @@ struct syscon_reboot_mode {
> u32 mask;
> };
>
> -static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,
> - unsigned int magic)
> +static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot, u64 magic)
> {
> struct syscon_reboot_mode *syscon_rbm;
> + u32 magic_32;
> int ret;
>
> + if (magic > U32_MAX)
> + return -EINVAL;
> +
> + magic_32 = magic;
> +
> syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);
>
> ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,
> - syscon_rbm->mask, magic);
> + syscon_rbm->mask, magic_32);
> if (ret < 0)
> dev_err(reboot->dev, "update reboot mode bits failed\n");
>
> diff --git a/include/linux/reboot-mode.h b/include/linux/reboot-mode.h
> index 98f68f95c9e8460be23282c51ef7fcbed73887bd..370228b5161963aac1d75af752ada0e8282b1078 100644
> --- a/include/linux/reboot-mode.h
> +++ b/include/linux/reboot-mode.h
> @@ -3,11 +3,12 @@
> #define __REBOOT_MODE_H__
>
> #include <linux/mutex.h>
> +#include <linux/types.h>
>
> struct reboot_mode_driver {
> struct device *dev;
> struct list_head head;
> - int (*write)(struct reboot_mode_driver *reboot, unsigned int magic);
> + int (*write)(struct reboot_mode_driver *reboot, u64 magic);
> struct notifier_block reboot_notifier;
> /*Protects access to reboot mode list*/
> struct mutex rb_lock;
>
--
// Casey (she/her)
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