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Message-ID: <41214edb-2011-4f96-84a3-d90f7970c4c8@amd.com>
Date: Mon, 2 Sep 2024 09:07:08 +0200
From: Michal Simek <michal.simek@....com>
To: Ronak Jain <ronak.jain@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] firmware: xilinx: Add missing debug firmware
interfaces
Hi,
On 7/30/24 10:43, Ronak Jain wrote:
> Add missing PM EEMI APIs interface in debug firmware driver.
>
> The debugfs firmware driver interface is intended for testing and
> debugging the EEMI APIs only. This interface does not contain any
> checking regarding improper usage, and the number, type and valid
> ranges of the arguments. This interface must be used with a lot of
> care. In fact, accessing this interface during normal PM operation
> will very likely cause unexpected problems.
>
> The debugfs interface shouldn't be used in the production system and
> hence it is disabled by default in defconfig.
>
> Signed-off-by: Ronak Jain <ronak.jain@....com>
> Signed-off-by: Michal Simek <michal.simek@....com>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> ---
> Changes in v2:
> - Address the compilation error
>
> References to the public documents who talks about the debugfs
> interface.
> https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/18842232/Zynq+UltraScale+MPSoC+Power+Management+-+Linux+Kernel#ZynqUltraScale%EF%BC%8BMPSoCPowerManagement-LinuxKernel-Debugfs
>
> https://docs.amd.com/r/en-US/ug1137-zynq-ultrascale-mpsoc-swdev/Debug-Interface
> ---
> drivers/firmware/xilinx/zynqmp-debug.c | 162 ++++++++++++++++++++++++-
> include/linux/firmware/xlnx-zynqmp.h | 4 +
> 2 files changed, 165 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/xilinx/zynqmp-debug.c b/drivers/firmware/xilinx/zynqmp-debug.c
> index 8528850af889..22853ae0efdf 100644
> --- a/drivers/firmware/xilinx/zynqmp-debug.c
> +++ b/drivers/firmware/xilinx/zynqmp-debug.c
> @@ -31,12 +31,50 @@ static char debugfs_buf[PAGE_SIZE];
>
> #define PM_API(id) {id, #id, strlen(#id)}
> static struct pm_api_info pm_api_list[] = {
> + PM_API(PM_FORCE_POWERDOWN),
> + PM_API(PM_REQUEST_WAKEUP),
> + PM_API(PM_SYSTEM_SHUTDOWN),
> + PM_API(PM_REQUEST_NODE),
> + PM_API(PM_RELEASE_NODE),
> + PM_API(PM_SET_REQUIREMENT),
> PM_API(PM_GET_API_VERSION),
> + PM_API(PM_REGISTER_NOTIFIER),
> + PM_API(PM_RESET_ASSERT),
> + PM_API(PM_RESET_GET_STATUS),
> + PM_API(PM_GET_CHIPID),
> + PM_API(PM_PINCTRL_SET_FUNCTION),
> + PM_API(PM_PINCTRL_CONFIG_PARAM_GET),
> + PM_API(PM_PINCTRL_CONFIG_PARAM_SET),
> + PM_API(PM_IOCTL),
> + PM_API(PM_CLOCK_ENABLE),
> + PM_API(PM_CLOCK_DISABLE),
> + PM_API(PM_CLOCK_GETSTATE),
> + PM_API(PM_CLOCK_SETDIVIDER),
> + PM_API(PM_CLOCK_GETDIVIDER),
> + PM_API(PM_CLOCK_SETPARENT),
> + PM_API(PM_CLOCK_GETPARENT),
> PM_API(PM_QUERY_DATA),
> };
>
> static struct dentry *firmware_debugfs_root;
>
> +/**
> + * zynqmp_pm_ioctl - PM IOCTL for device control and configs
> + * @node: Node ID of the device
> + * @ioctl: ID of the requested IOCTL
> + * @arg1: Argument 1 of requested IOCTL call
> + * @arg2: Argument 2 of requested IOCTL call
> + * @arg3: Argument 3 of requested IOCTL call
> + * @out: Returned output value
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +static int zynqmp_pm_ioctl(const u32 node, const u32 ioctl, const u32 arg1,
> + const u32 arg2, const u32 arg3, u32 *out)
> +{
> + return zynqmp_pm_invoke_fn(PM_IOCTL, out, 5, node, ioctl, arg1, arg2, arg3);
> +}
> +
> /**
> * zynqmp_pm_argument_value() - Extract argument value from a PM-API request
> * @arg: Entered PM-API argument in string format
> @@ -95,6 +133,128 @@ static int process_api_request(u32 pm_id, u64 *pm_api_arg, u32 *pm_api_ret)
> sprintf(debugfs_buf, "PM-API Version = %d.%d\n",
> pm_api_version >> 16, pm_api_version & 0xffff);
> break;
> + case PM_FORCE_POWERDOWN:
> + ret = zynqmp_pm_force_pwrdwn(pm_api_arg[0],
> + pm_api_arg[1] ? pm_api_arg[1] :
> + ZYNQMP_PM_REQUEST_ACK_NO);
> + break;
> + case PM_REQUEST_WAKEUP:
> + ret = zynqmp_pm_request_wake(pm_api_arg[0],
> + pm_api_arg[1], pm_api_arg[2],
> + pm_api_arg[3] ? pm_api_arg[3] :
> + ZYNQMP_PM_REQUEST_ACK_NO);
> + break;
> + case PM_SYSTEM_SHUTDOWN:
> + ret = zynqmp_pm_system_shutdown(pm_api_arg[0], pm_api_arg[1]);
> + break;
> + case PM_REQUEST_NODE:
> + ret = zynqmp_pm_request_node(pm_api_arg[0],
> + pm_api_arg[1] ? pm_api_arg[1] :
> + ZYNQMP_PM_CAPABILITY_ACCESS,
> + pm_api_arg[2] ? pm_api_arg[2] : 0,
> + pm_api_arg[3] ? pm_api_arg[3] :
> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> + break;
> + case PM_RELEASE_NODE:
> + ret = zynqmp_pm_release_node(pm_api_arg[0]);
> + break;
> + case PM_SET_REQUIREMENT:
> + ret = zynqmp_pm_set_requirement(pm_api_arg[0],
> + pm_api_arg[1] ? pm_api_arg[1] :
> + ZYNQMP_PM_CAPABILITY_CONTEXT,
> + pm_api_arg[2] ?
> + pm_api_arg[2] : 0,
> + pm_api_arg[3] ? pm_api_arg[3] :
> + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> + break;
> + case PM_REGISTER_NOTIFIER:
> + ret = zynqmp_pm_register_notifier(pm_api_arg[0],
> + pm_api_arg[1] ?
> + pm_api_arg[1] : 0,
> + pm_api_arg[2] ?
> + pm_api_arg[2] : 0,
> + pm_api_arg[3] ?
> + pm_api_arg[3] : 0);
> + break;
> + case PM_RESET_ASSERT:
> + ret = zynqmp_pm_reset_assert(pm_api_arg[0], pm_api_arg[1]);
> + break;
> + case PM_RESET_GET_STATUS:
> + ret = zynqmp_pm_reset_get_status(pm_api_arg[0], &pm_api_ret[0]);
> + if (!ret)
> + sprintf(debugfs_buf, "Reset status: %u\n",
> + pm_api_ret[0]);
> + break;
> + case PM_GET_CHIPID:
> + ret = zynqmp_pm_get_chipid(&pm_api_ret[0], &pm_api_ret[1]);
> + if (!ret)
> + sprintf(debugfs_buf, "Idcode: %#x, Version:%#x\n",
> + pm_api_ret[0], pm_api_ret[1]);
> + break;
> + case PM_PINCTRL_SET_FUNCTION:
> + ret = zynqmp_pm_pinctrl_set_function(pm_api_arg[0],
> + pm_api_arg[1]);
> + break;
> + case PM_PINCTRL_CONFIG_PARAM_GET:
> + ret = zynqmp_pm_pinctrl_get_config(pm_api_arg[0], pm_api_arg[1],
> + &pm_api_ret[0]);
> + if (!ret)
> + sprintf(debugfs_buf,
> + "Pin: %llu, Param: %llu, Value: %u\n",
> + pm_api_arg[0], pm_api_arg[1],
> + pm_api_ret[0]);
> + break;
> + case PM_PINCTRL_CONFIG_PARAM_SET:
> + ret = zynqmp_pm_pinctrl_set_config(pm_api_arg[0],
> + pm_api_arg[1],
> + pm_api_arg[2]);
> + break;
> + case PM_IOCTL:
> + ret = zynqmp_pm_ioctl(pm_api_arg[0], pm_api_arg[1],
> + pm_api_arg[2], pm_api_arg[3],
> + pm_api_arg[4], &pm_api_ret[0]);
> + if (!ret && (pm_api_arg[1] == IOCTL_GET_RPU_OPER_MODE ||
> + pm_api_arg[1] == IOCTL_GET_PLL_FRAC_MODE ||
> + pm_api_arg[1] == IOCTL_GET_PLL_FRAC_DATA ||
> + pm_api_arg[1] == IOCTL_READ_GGS ||
> + pm_api_arg[1] == IOCTL_READ_PGGS ||
> + pm_api_arg[1] == IOCTL_READ_REG))
> + sprintf(debugfs_buf, "IOCTL return value: %u\n",
> + pm_api_ret[1]);
> + if (!ret && pm_api_arg[1] == IOCTL_GET_QOS)
> + sprintf(debugfs_buf, "Default QoS: %u\nCurrent QoS: %u\n",
> + pm_api_ret[1], pm_api_ret[2]);
> + break;
> + case PM_CLOCK_ENABLE:
> + ret = zynqmp_pm_clock_enable(pm_api_arg[0]);
> + break;
> + case PM_CLOCK_DISABLE:
> + ret = zynqmp_pm_clock_disable(pm_api_arg[0]);
> + break;
> + case PM_CLOCK_GETSTATE:
> + ret = zynqmp_pm_clock_getstate(pm_api_arg[0], &pm_api_ret[0]);
> + if (!ret)
> + sprintf(debugfs_buf, "Clock state: %u\n",
> + pm_api_ret[0]);
> + break;
> + case PM_CLOCK_SETDIVIDER:
> + ret = zynqmp_pm_clock_setdivider(pm_api_arg[0], pm_api_arg[1]);
> + break;
> + case PM_CLOCK_GETDIVIDER:
> + ret = zynqmp_pm_clock_getdivider(pm_api_arg[0], &pm_api_ret[0]);
> + if (!ret)
> + sprintf(debugfs_buf, "Divider Value: %d\n",
> + pm_api_ret[0]);
> + break;
> + case PM_CLOCK_SETPARENT:
> + ret = zynqmp_pm_clock_setparent(pm_api_arg[0], pm_api_arg[1]);
> + break;
> + case PM_CLOCK_GETPARENT:
> + ret = zynqmp_pm_clock_getparent(pm_api_arg[0], &pm_api_ret[0]);
> + if (!ret)
> + sprintf(debugfs_buf,
> + "Clock parent Index: %u\n", pm_api_ret[0]);
> + break;
> case PM_QUERY_DATA:
> qdata.qid = pm_api_arg[0];
> qdata.arg1 = pm_api_arg[1];
> @@ -150,7 +310,7 @@ static ssize_t zynqmp_pm_debugfs_api_write(struct file *file,
> char *kern_buff, *tmp_buff;
> char *pm_api_req;
> u32 pm_id = 0;
> - u64 pm_api_arg[4] = {0, 0, 0, 0};
> + u64 pm_api_arg[5] = {0, 0, 0, 0, 0};
> /* Return values from PM APIs calls */
> u32 pm_api_ret[4] = {0, 0, 0, 0};
>
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index d7d07afc0532..563382cf16f2 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -218,9 +218,13 @@ enum pm_ioctl_id {
> /* Runtime feature configuration */
> IOCTL_SET_FEATURE_CONFIG = 26,
> IOCTL_GET_FEATURE_CONFIG = 27,
> + /* IOCTL for Secure Read/Write Interface */
> + IOCTL_READ_REG = 28,
> /* Dynamic SD/GEM configuration */
> IOCTL_SET_SD_CONFIG = 30,
> IOCTL_SET_GEM_CONFIG = 31,
> + /* IOCTL to get default/current QoS */
> + IOCTL_GET_QOS = 34,
> };
>
> enum pm_query_id {
Applied.
M
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