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Message-ID: <2b55b71aaa89e9010d58f5b3c7f5823782ab760c.camel@linux.intel.com>
Date: Thu, 23 Dec 2021 07:30:58 -0800
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>, rafael@...nel.org,
daniel.lezcano@...aro.org, linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] thermal/drivers/int340x: Fix RFIM mailbox write
commands
On Thu, 2021-12-23 at 15:12 +0530, Sumeet Pawnikar wrote:
> The existing mail mechanism only supports writing of workload types.
> But mailbox command for RFIM (cmd = 0x08) also requires write operation
> which was ignored. This results in failing to store RFI restriction.
> This requires enhancing mailbox writes for non workload commands also.
> So, remove the check for MBOX_CMD_WORKLOAD_TYPE_WRITE in mailbox write,
> with this other write commands also can be supoorted. But at the same
> time, we have to make sure that there is no impact on read commands,
> by not writing anything in mailbox data register.
> To properly implement, add two separate functions for mbox read and
> write
> command for processor thermal workload command type. This helps to
> differentiate the read and write workload command types while sending
> mbox
> command.
>
> Fixes: 5d6fbc96bd36 ("thermal/drivers/int340x: processor_thermal:
> Export additional attributes")
> Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@...el.com>
> Cc: stable@...r.kernel.org # 5.14+
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
> Changes in v2 from v1:
> - Addressed below review comments received from Srinivas.
> - updated subject line.
> - removed data argument for send_mbox_read_cmd function as it's not
> used.
> - removed writel call inside send_mbox_read_cmd function which is
> not required.
> ---
> .../processor_thermal_device.h | 3 +-
> .../int340x_thermal/processor_thermal_mbox.c | 100 +++++++++++-------
> .../int340x_thermal/processor_thermal_rfim.c | 23 ++--
> 3 files changed, 73 insertions(+), 53 deletions(-)
>
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h
> index be27f633e40a..9b2a64ef55d0 100644
> --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h
> +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.h
> @@ -80,7 +80,8 @@ void proc_thermal_rfim_remove(struct pci_dev *pdev);
> int proc_thermal_mbox_add(struct pci_dev *pdev, struct
> proc_thermal_device *proc_priv);
> void proc_thermal_mbox_remove(struct pci_dev *pdev);
>
> -int processor_thermal_send_mbox_cmd(struct pci_dev *pdev, u16 cmd_id,
> u32 cmd_data, u64 *cmd_resp);
> +int processor_thermal_send_mbox_read_cmd(struct pci_dev *pdev, u16 id,
> u64 *resp);
> +int processor_thermal_send_mbox_write_cmd(struct pci_dev *pdev, u16
> id, u32 data);
> int proc_thermal_add(struct device *dev, struct proc_thermal_device
> *priv);
> void proc_thermal_remove(struct proc_thermal_device *proc_priv);
> int proc_thermal_suspend(struct device *dev);
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_mbox.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_mbox.c
> index 01008ae00e7f..0b89a4340ff4 100644
> --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_mbox.c
> +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_mbox.c
> @@ -24,19 +24,15 @@
>
> static DEFINE_MUTEX(mbox_lock);
>
> -static int send_mbox_cmd(struct pci_dev *pdev, u16 cmd_id, u32
> cmd_data, u64 *cmd_resp)
> +static int wait_for_mbox_ready(struct proc_thermal_device *proc_priv)
> {
> - struct proc_thermal_device *proc_priv;
> u32 retries, data;
> int ret;
>
> - mutex_lock(&mbox_lock);
> - proc_priv = pci_get_drvdata(pdev);
> -
> /* Poll for rb bit == 0 */
> retries = MBOX_RETRY_COUNT;
> do {
> - data = readl((void __iomem *) (proc_priv->mmio_base +
> MBOX_OFFSET_INTERFACE));
> + data = readl(proc_priv->mmio_base +
> MBOX_OFFSET_INTERFACE);
> if (data & BIT_ULL(MBOX_BUSY_BIT)) {
> ret = -EBUSY;
> continue;
> @@ -45,53 +41,78 @@ static int send_mbox_cmd(struct pci_dev *pdev, u16
> cmd_id, u32 cmd_data, u64 *cm
> break;
> } while (--retries);
>
> + return ret;
> +}
> +
> +static int send_mbox_write_cmd(struct pci_dev *pdev, u16 id, u32 data)
> +{
> + struct proc_thermal_device *proc_priv;
> + u32 reg_data;
> + int ret;
> +
> + proc_priv = pci_get_drvdata(pdev);
> +
> + mutex_lock(&mbox_lock);
> +
> + ret = wait_for_mbox_ready(proc_priv);
> if (ret)
> goto unlock_mbox;
>
> - if (cmd_id == MBOX_CMD_WORKLOAD_TYPE_WRITE)
> - writel(cmd_data, (void __iomem *) ((proc_priv-
> >mmio_base + MBOX_OFFSET_DATA)));
> -
> + writel(data, (proc_priv->mmio_base + MBOX_OFFSET_DATA));
> /* Write command register */
> - data = BIT_ULL(MBOX_BUSY_BIT) | cmd_id;
> - writel(data, (void __iomem *) ((proc_priv->mmio_base +
> MBOX_OFFSET_INTERFACE)));
> + reg_data = BIT_ULL(MBOX_BUSY_BIT) | id;
> + writel(reg_data, (proc_priv->mmio_base +
> MBOX_OFFSET_INTERFACE));
>
> - /* Poll for rb bit == 0 */
> - retries = MBOX_RETRY_COUNT;
> - do {
> - data = readl((void __iomem *) (proc_priv->mmio_base +
> MBOX_OFFSET_INTERFACE));
> - if (data & BIT_ULL(MBOX_BUSY_BIT)) {
> - ret = -EBUSY;
> - continue;
> - }
> + ret = wait_for_mbox_ready(proc_priv);
>
> - if (data) {
> - ret = -ENXIO;
> - goto unlock_mbox;
> - }
> +unlock_mbox:
> + mutex_unlock(&mbox_lock);
> + return ret;
> +}
>
> - ret = 0;
> +static int send_mbox_read_cmd(struct pci_dev *pdev, u16 id, u64 *resp)
> +{
> + struct proc_thermal_device *proc_priv;
> + u32 reg_data;
> + int ret;
>
> - if (!cmd_resp)
> - break;
> + proc_priv = pci_get_drvdata(pdev);
>
> - if (cmd_id == MBOX_CMD_WORKLOAD_TYPE_READ)
> - *cmd_resp = readl((void __iomem *) (proc_priv-
> >mmio_base + MBOX_OFFSET_DATA));
> - else
> - *cmd_resp = readq((void __iomem *) (proc_priv-
> >mmio_base + MBOX_OFFSET_DATA));
> + mutex_lock(&mbox_lock);
>
> - break;
> - } while (--retries);
> + ret = wait_for_mbox_ready(proc_priv);
> + if (ret)
> + goto unlock_mbox;
> +
> + /* Write command register */
> + reg_data = BIT_ULL(MBOX_BUSY_BIT) | id;
> + writel(reg_data, (proc_priv->mmio_base +
> MBOX_OFFSET_INTERFACE));
> +
> + ret = wait_for_mbox_ready(proc_priv);
> + if (ret)
> + goto unlock_mbox;
> +
> + if (id == MBOX_CMD_WORKLOAD_TYPE_READ)
> + *resp = readl(proc_priv->mmio_base + MBOX_OFFSET_DATA);
> + else
> + *resp = readq(proc_priv->mmio_base + MBOX_OFFSET_DATA);
>
> unlock_mbox:
> mutex_unlock(&mbox_lock);
> return ret;
> }
>
> -int processor_thermal_send_mbox_cmd(struct pci_dev *pdev, u16 cmd_id,
> u32 cmd_data, u64 *cmd_resp)
> +int processor_thermal_send_mbox_read_cmd(struct pci_dev *pdev, u16 id,
> u64 *resp)
> {
> - return send_mbox_cmd(pdev, cmd_id, cmd_data, cmd_resp);
> + return send_mbox_read_cmd(pdev, id, resp);
> }
> -EXPORT_SYMBOL_GPL(processor_thermal_send_mbox_cmd);
> +EXPORT_SYMBOL_NS_GPL(processor_thermal_send_mbox_read_cmd,
> INT340X_THERMAL);
> +
> +int processor_thermal_send_mbox_write_cmd(struct pci_dev *pdev, u16
> id, u32 data)
> +{
> + return send_mbox_write_cmd(pdev, id, data);
> +}
> +EXPORT_SYMBOL_NS_GPL(processor_thermal_send_mbox_write_cmd,
> INT340X_THERMAL);
>
> /* List of workload types */
> static const char * const workload_types[] = {
> @@ -104,7 +125,6 @@ static const char * const workload_types[] = {
> NULL
> };
>
> -
> static ssize_t workload_available_types_show(struct device *dev,
> struct device_attribute
> *attr,
> char *buf)
> @@ -146,7 +166,7 @@ static ssize_t workload_type_store(struct device
> *dev,
>
> data |= ret;
>
> - ret = send_mbox_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_WRITE, data,
> NULL);
> + ret = send_mbox_write_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_WRITE,
> data);
> if (ret)
> return false;
>
> @@ -161,7 +181,7 @@ static ssize_t workload_type_show(struct device
> *dev,
> u64 cmd_resp;
> int ret;
>
> - ret = send_mbox_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_READ, 0,
> &cmd_resp);
> + ret = send_mbox_read_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_READ,
> &cmd_resp);
> if (ret)
> return false;
>
> @@ -186,8 +206,6 @@ static const struct attribute_group
> workload_req_attribute_group = {
> .name = "workload_request"
> };
>
> -
> -
> static bool workload_req_created;
>
> int proc_thermal_mbox_add(struct pci_dev *pdev, struct
> proc_thermal_device *proc_priv)
> @@ -196,7 +214,7 @@ int proc_thermal_mbox_add(struct pci_dev *pdev,
> struct proc_thermal_device *proc
> int ret;
>
> /* Check if there is a mailbox support, if fails return success
> */
> - ret = send_mbox_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_READ, 0,
> &cmd_resp);
> + ret = send_mbox_read_cmd(pdev, MBOX_CMD_WORKLOAD_TYPE_READ,
> &cmd_resp);
> if (ret)
> return 0;
>
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> index e693ec8234fb..8c42e7662033 100644
> --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> @@ -9,6 +9,8 @@
> #include <linux/pci.h>
> #include "processor_thermal_device.h"
>
> +MODULE_IMPORT_NS(INT340X_THERMAL);
> +
> struct mmio_reg {
> int read_only;
> u32 offset;
> @@ -194,8 +196,7 @@ static ssize_t rfi_restriction_store(struct device
> *dev,
> struct device_attribute *attr,
> const char *buf, size_t count)
> {
> - u16 cmd_id = 0x0008;
> - u64 cmd_resp;
> + u16 id = 0x0008;
> u32 input;
> int ret;
>
> @@ -203,7 +204,7 @@ static ssize_t rfi_restriction_store(struct device
> *dev,
> if (ret)
> return ret;
>
> - ret = processor_thermal_send_mbox_cmd(to_pci_dev(dev), cmd_id,
> input, &cmd_resp);
> + ret = processor_thermal_send_mbox_write_cmd(to_pci_dev(dev),
> id, input);
> if (ret)
> return ret;
>
> @@ -214,30 +215,30 @@ static ssize_t rfi_restriction_show(struct device
> *dev,
> struct device_attribute *attr,
> char *buf)
> {
> - u16 cmd_id = 0x0007;
> - u64 cmd_resp;
> + u16 id = 0x0007;
> + u64 resp;
> int ret;
>
> - ret = processor_thermal_send_mbox_cmd(to_pci_dev(dev), cmd_id,
> 0, &cmd_resp);
> + ret = processor_thermal_send_mbox_read_cmd(to_pci_dev(dev), id,
> &resp);
> if (ret)
> return ret;
>
> - return sprintf(buf, "%llu\n", cmd_resp);
> + return sprintf(buf, "%llu\n", resp);
> }
>
> static ssize_t ddr_data_rate_show(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> {
> - u16 cmd_id = 0x0107;
> - u64 cmd_resp;
> + u16 id = 0x0107;
> + u64 resp;
> int ret;
>
> - ret = processor_thermal_send_mbox_cmd(to_pci_dev(dev), cmd_id,
> 0, &cmd_resp);
> + ret = processor_thermal_send_mbox_read_cmd(to_pci_dev(dev), id,
> &resp);
> if (ret)
> return ret;
>
> - return sprintf(buf, "%llu\n", cmd_resp);
> + return sprintf(buf, "%llu\n", resp);
> }
>
> static DEVICE_ATTR_RW(rfi_restriction);
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