merged.
Bruce
In message:
[linux-yocto][v5.15/standard/preempt-rt/nxp-sdk-5.15/nxp-s32g][PATCH] gpio: fix
pinctrl_gpio_get_mux_owner
on 24/01/2024 quanyang.w...@windriver.com wrote:
> From: Quanyang Wang <quanyang.w...@windriver.com>
>
> The commit 4ce1995313ecb ("gpio: use pinctrl_gpio_get_mux_owner")
> intends to call pinctrl_gpio_get_mux_owner to mark the muxed pin as
> "used" and copy "mux_owner" or "gpio_owner" to "info->consumer". So that
> when calling gpioinfo at userspace, the "mux_owner" is printed as
> "label" in the output of console:
>
> root@nxp-s32g:~# gpioinfo gpiochip0
> gpiochip0 - 191 lines:
> ...
> line 5: "PA_05" unused input active-high
> line 6: "PA_06" "401d8000.spi" input active-high [used]
> line 7: "PA_07" "401d8000.spi" input active-high [used]
> ...
>
> But there are 3 problems with the current implementation:
> 1. The parameter "gpio" of the function pinctrl_gpio_get_mux_owner
> should be "gc->base + info->offset" rather than "info->offset".
> 2. The member "strict" of s32cc_pmx_ops can be used to mark the flag
> GPIO_V2_LINE_FLAG_USED, so there is no need to use the funciton
> pinctrl_gpio_get_mux_owner to do that.
> 3. The function pinctrl_gpio_get_mux_owner takes mutex so it must be
> called before taking the spinlock, or else it triggers the following
> calltrace:
>
> [ 4640.017246] BUG: sleeping function called from invalid context at
> kernel/locking/rtmutex_api.c:510
> [ 4640.017264] in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 11395,
> name: gpioinfo
> [ 4640.017271] preempt_count: 0, expected: 0
> [ 4640.017276] RCU nest depth: 1, expected: 0
> [ 4640.017281] INFO: lockdep is turned off.
> [ 4640.017290] CPU: 3 PID: 11395 Comm: gpioinfo Tainted: G W O
> 5.15.147-rt72-yocto-preempt-rt #1
> [ 4640.017297] Hardware name: Freescale S32G399A (DT)
> [ 4640.017302] Call trace:
> [ 4640.017304] dump_backtrace+0x0/0x1c0
> [ 4640.017319] show_stack+0x20/0x30
> [ 4640.017325] dump_stack_lvl+0xb0/0xf4
> [ 4640.017335] dump_stack+0x18/0x34
> [ 4640.017342] __might_resched+0x15c/0x1e0
> [ 4640.017351] __might_sleep+0x50/0xa0
> [ 4640.017357] mutex_lock_nested+0x58/0xe0
> [ 4640.017367] pinctrl_get_device_gpio_range+0x48/0x11c
> [ 4640.017378] pinctrl_gpio_get_mux_owner+0x48/0x110
> [ 4640.017386] gpio_desc_to_lineinfo+0x2a8/0x2dc
> [ 4640.017396] lineinfo_get_v1+0x144/0x260
> [ 4640.017405] gpio_ioctl_unlocked+0xf4/0x3d0
> [ 4640.017410] gpio_ioctl+0x4c/0x74
> [ 4640.017415] __arm64_sys_ioctl+0xb0/0xf4
> [ 4640.017424] invoke_syscall+0x5c/0x130
> [ 4640.017437] el0_svc_common.constprop.0+0x68/0x124
> [ 4640.017445] do_el0_svc+0x4c/0xb0
> [ 4640.017452] el0_svc+0x54/0x110
> [ 4640.017458] el0t_64_sync_handler+0xa4/0x12c
> [ 4640.017464] el0t_64_sync+0x1a0/0x1a4
>
> Signed-off-by: Quanyang Wang <quanyang.w...@windriver.com>
> ---
> Hi Bruce,
> Would you please help merge this patch to the branches:
> v5.15/standard/preempt-rt/nxp-sdk-5.15/nxp-s32g
> v5.15/standard/nxp-sdk-5.15/nxp-s32g
> Thanks,
> Quanyang
> ---
> drivers/gpio/gpiolib-cdev.c | 10 +++-------
> drivers/pinctrl/freescale/pinctrl-s32cc-core.c | 1 +
> 2 files changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
> index e3b0d1fbd728a..80e8c32d65e12 100644
> --- a/drivers/gpio/gpiolib-cdev.c
> +++ b/drivers/gpio/gpiolib-cdev.c
> @@ -2021,7 +2021,6 @@ static void gpio_desc_to_lineinfo(struct gpio_desc
> *desc,
> unsigned long flags;
> u32 debounce_period_us;
> unsigned int num_attrs = 0;
> - int ret;
>
> memset(info, 0, sizeof(*info));
> info->offset = gpio_chip_hwgpio(desc);
> @@ -2036,6 +2035,9 @@ static void gpio_desc_to_lineinfo(struct gpio_desc
> *desc,
> ok_for_pinctrl =
> pinctrl_gpio_can_use_line(gc->base + info->offset);
>
> + pinctrl_gpio_get_mux_owner(gc->base + info->offset, info->consumer,
> + sizeof(info->consumer));
> +
> spin_lock_irqsave(&gpio_lock, flags);
>
> if (desc->name)
> @@ -2049,12 +2051,6 @@ static void gpio_desc_to_lineinfo(struct gpio_desc
> *desc,
>
> if (desc->label)
> strscpy(info->consumer, desc->label, sizeof(info->consumer));
> - else {
> - ret = pinctrl_gpio_get_mux_owner(info->offset, info->consumer,
> - sizeof(info->consumer));
> - if (!ret)
> - info->flags |= GPIO_V2_LINE_FLAG_USED;
> - }
>
> if (test_bit(FLAG_REQUESTED, &desc->flags) ||
> test_bit(FLAG_IS_HOGGED, &desc->flags) ||
> diff --git a/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
> b/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
> index e1d0cc817b65a..a711242dc626b 100644
> --- a/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
> +++ b/drivers/pinctrl/freescale/pinctrl-s32cc-core.c
> @@ -553,6 +553,7 @@ static const struct pinmux_ops s32cc_pmx_ops = {
> .gpio_request_enable = s32cc_pmx_gpio_request_enable,
> .gpio_disable_free = s32cc_pmx_gpio_disable_free,
> .gpio_set_direction = s32cc_pmx_gpio_set_direction,
> + .strict = true,
> };
>
> static int s32cc_pinconf_get(struct pinctrl_dev *pctldev,
> --
> 2.36.1
>
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