diff mbox series

[v1,06/15] platform/x86/amd/pmf: Add heartbeat signal support

Message ID 20220712145847.3438544-7-Shyam-sundar.S-k@amd.com (mailing list archive)
State Changes Requested, archived
Headers show
Series platform/x86/amd/pmf: Introduce AMD PMF Driver | expand

Commit Message

Shyam Sundar S K July 12, 2022, 2:58 p.m. UTC 
PMF driver can send periodic heartbeat signals to OEM BIOS. When BIOS does
not receive the signal after a period of time, it can infer that AMDPMF
has hung or failed to load.

In this situation, BIOS can fallback to legacy operations. OEM can modify
the time interval of the signal or completely disable signals through
ACPI Method.

Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
---
 drivers/platform/x86/amd/pmf/acpi.c | 42 +++++++++++++++++++++++++++--
 drivers/platform/x86/amd/pmf/core.c |  1 +
 drivers/platform/x86/amd/pmf/pmf.h  | 10 +++++++
 3 files changed, 51 insertions(+), 2 deletions(-)

Comments

Hans de Goede July 27, 2022, 7:53 p.m. UTC | #1 
Hi,

On 7/12/22 16:58, Shyam Sundar S K wrote:
> PMF driver can send periodic heartbeat signals to OEM BIOS. When BIOS does
> not receive the signal after a period of time, it can infer that AMDPMF
> has hung or failed to load.
> 
> In this situation, BIOS can fallback to legacy operations. OEM can modify
> the time interval of the signal or completely disable signals through
> ACPI Method.
> 
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Regards,

Hans


> ---
>  drivers/platform/x86/amd/pmf/acpi.c | 42 +++++++++++++++++++++++++++--
>  drivers/platform/x86/amd/pmf/core.c |  1 +
>  drivers/platform/x86/amd/pmf/pmf.h  | 10 +++++++
>  3 files changed, 51 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
> index fd5ab7a116f0..60ffc9ba4adc 100644
> --- a/drivers/platform/x86/amd/pmf/acpi.c
> +++ b/drivers/platform/x86/amd/pmf/acpi.c
> @@ -97,6 +97,7 @@ int is_apmf_func_supported(unsigned long index)
>  
>  static int apmf_get_system_params(struct apmf_if *ampf_if)
>  {
> +	struct apmf_notification_cfg *n = &ampf_if->notify_cfg;
>  	struct apmf_system_params params;
>  	union acpi_object *info;
>  	size_t size;
> @@ -120,11 +121,13 @@ static int apmf_get_system_params(struct apmf_if *ampf_if)
>  	memset(&params, 0, sizeof(params));
>  	memcpy(&params, info->buffer.pointer, size);
>  
> -	pr_debug("PMF: system params mask:0x%x flags:0x%x cmd_code:0x%x\n",
> +	pr_debug("PMF: system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
>  		 params.valid_mask,
>  		 params.flags,
> -		 params.command_code);
> +		 params.command_code,
> +		 params.heartbeat_int);
>  	params.flags = params.flags & params.valid_mask;
> +	n->hb_interval = params.heartbeat_int;
>  
>  out:
>  	kfree(info);
> @@ -159,6 +162,26 @@ int apmf_get_static_slider_granular(struct apmf_if *ampf_if,
>  	return err;
>  }
>  
> +static void apmf_sbios_heartbeat_notify(struct work_struct *work)
> +{
> +	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
> +	struct apmf_notification_cfg *n = &dev->apmf_if->notify_cfg;
> +	union acpi_object *info;
> +	int err = 0;
> +
> +	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
> +	info = apmf_if_call(dev->apmf_if, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
> +	if (!info) {
> +		err = -EIO;
> +		goto out;
> +	}
> +
> +	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(n->hb_interval * 1000));
> +
> +out:
> +	kfree(info);
> +}
> +
>  static acpi_handle apmf_if_probe_handle(void)
>  {
>  	acpi_handle handle = NULL;
> @@ -179,8 +202,15 @@ static acpi_handle apmf_if_probe_handle(void)
>  	return handle;
>  }
>  
> +void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
> +{
> +	if (pmf_dev->apmf_if->func.sbios_heartbeat)
> +		cancel_delayed_work_sync(&pmf_dev->heart_beat);
> +}
> +
>  int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
>  {
> +	struct apmf_notification_cfg *n;
>  	acpi_handle apmf_if_handle;
>  	struct apmf_if *apmf_if;
>  	int ret;
> @@ -202,6 +232,7 @@ int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
>  		goto out;
>  	}
>  	pmf_dev->apmf_if = apmf_if;
> +	n = &apmf_if->notify_cfg;
>  
>  	if (apmf_if->func.system_params) {
>  		ret = apmf_get_system_params(apmf_if);
> @@ -212,6 +243,13 @@ int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
>  		}
>  	}
>  
> +	if (n->hb_interval) {
> +		apmf_if->func.sbios_heartbeat = true;
> +		/* send heartbeats only if the interval is not zero */
> +		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
> +		schedule_delayed_work(&pmf_dev->heart_beat, 0);
> +	}
> +
>  out:
>  	return ret;
>  }
> diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
> index 3d2af6a8e5e4..ff26928e6a49 100644
> --- a/drivers/platform/x86/amd/pmf/core.c
> +++ b/drivers/platform/x86/amd/pmf/core.c
> @@ -289,6 +289,7 @@ static int amd_pmf_remove(struct platform_device *pdev)
>  
>  	mutex_destroy(&dev->lock);
>  	amd_pmf_deinit_features(dev);
> +	apmf_acpi_deinit(dev);
>  	amd_pmf_dbgfs_unregister(dev);
>  	kfree(dev->buf);
>  	return 0;
> diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
> index 77021ef4bfde..504e1ae79706 100644
> --- a/drivers/platform/x86/amd/pmf/pmf.h
> +++ b/drivers/platform/x86/amd/pmf/pmf.h
> @@ -17,6 +17,7 @@
>  /* APMF Functions */
>  #define APMF_FUNC_VERIFY_INTERFACE			0
>  #define APMF_FUNC_GET_SYS_PARAMS			1
> +#define APMF_FUNC_SBIOS_HEARTBEAT			4
>  #define APMF_FUNC_STATIC_SLIDER_GRANULAR	9
>  
>  /* Message Definitions */
> @@ -43,12 +44,18 @@
>  /* AMD PMF BIOS interfaces */
>  struct apmf_if_functions {
>  	bool system_params;
> +	bool sbios_heartbeat;
>  	bool static_slider_granular;
>  };
>  
> +struct apmf_notification_cfg {
> +	int hb_interval; /* SBIOS heartbeat interval */
> +};
> +
>  struct apmf_if {
>  	acpi_handle handle;
>  	struct apmf_if_functions func;
> +	struct apmf_notification_cfg notify_cfg;
>  };
>  
>  struct apmf_verify_interface {
> @@ -63,6 +70,7 @@ struct apmf_system_params {
>  	u32 valid_mask;
>  	u32 flags;
>  	u8 command_code;
> +	u32 heartbeat_int;
>  } __packed;
>  
>  enum amd_stt_skin_temp {
> @@ -101,6 +109,7 @@ struct amd_pmf_dev {
>  	struct apmf_if *apmf_if;
>  	enum platform_profile_option current_profile;
>  	struct platform_profile_handler pprof;
> +	struct delayed_work heart_beat;
>  	struct mutex lock; /* protects the PMF interface */
>  #if IS_ENABLED(CONFIG_DEBUG_FS)
>  	struct dentry *dbgfs_dir;
> @@ -130,6 +139,7 @@ struct amd_pmf_static_slider_granular {
>  
>  /* Core Layer */
>  int apmf_acpi_init(struct amd_pmf_dev *pmf_dev);
> +void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev);
>  int is_apmf_func_supported(unsigned long index);
>  int amd_pmf_send_cmd(struct amd_pmf_dev *dev, u8 message, bool get, u32 arg, u32 *data);
>  int amd_pmf_get_power_source(void);
diff mbox series

Patch

diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
index fd5ab7a116f0..60ffc9ba4adc 100644
--- a/drivers/platform/x86/amd/pmf/acpi.c
+++ b/drivers/platform/x86/amd/pmf/acpi.c
@@ -97,6 +97,7 @@  int is_apmf_func_supported(unsigned long index)
 
 static int apmf_get_system_params(struct apmf_if *ampf_if)
 {
+	struct apmf_notification_cfg *n = &ampf_if->notify_cfg;
 	struct apmf_system_params params;
 	union acpi_object *info;
 	size_t size;
@@ -120,11 +121,13 @@  static int apmf_get_system_params(struct apmf_if *ampf_if)
 	memset(&params, 0, sizeof(params));
 	memcpy(&params, info->buffer.pointer, size);
 
-	pr_debug("PMF: system params mask:0x%x flags:0x%x cmd_code:0x%x\n",
+	pr_debug("PMF: system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
 		 params.valid_mask,
 		 params.flags,
-		 params.command_code);
+		 params.command_code,
+		 params.heartbeat_int);
 	params.flags = params.flags & params.valid_mask;
+	n->hb_interval = params.heartbeat_int;
 
 out:
 	kfree(info);
@@ -159,6 +162,26 @@  int apmf_get_static_slider_granular(struct apmf_if *ampf_if,
 	return err;
 }
 
+static void apmf_sbios_heartbeat_notify(struct work_struct *work)
+{
+	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
+	struct apmf_notification_cfg *n = &dev->apmf_if->notify_cfg;
+	union acpi_object *info;
+	int err = 0;
+
+	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
+	info = apmf_if_call(dev->apmf_if, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
+	if (!info) {
+		err = -EIO;
+		goto out;
+	}
+
+	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(n->hb_interval * 1000));
+
+out:
+	kfree(info);
+}
+
 static acpi_handle apmf_if_probe_handle(void)
 {
 	acpi_handle handle = NULL;
@@ -179,8 +202,15 @@  static acpi_handle apmf_if_probe_handle(void)
 	return handle;
 }
 
+void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
+{
+	if (pmf_dev->apmf_if->func.sbios_heartbeat)
+		cancel_delayed_work_sync(&pmf_dev->heart_beat);
+}
+
 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
 {
+	struct apmf_notification_cfg *n;
 	acpi_handle apmf_if_handle;
 	struct apmf_if *apmf_if;
 	int ret;
@@ -202,6 +232,7 @@  int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
 		goto out;
 	}
 	pmf_dev->apmf_if = apmf_if;
+	n = &apmf_if->notify_cfg;
 
 	if (apmf_if->func.system_params) {
 		ret = apmf_get_system_params(apmf_if);
@@ -212,6 +243,13 @@  int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
 		}
 	}
 
+	if (n->hb_interval) {
+		apmf_if->func.sbios_heartbeat = true;
+		/* send heartbeats only if the interval is not zero */
+		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
+		schedule_delayed_work(&pmf_dev->heart_beat, 0);
+	}
+
 out:
 	return ret;
 }
diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c
index 3d2af6a8e5e4..ff26928e6a49 100644
--- a/drivers/platform/x86/amd/pmf/core.c
+++ b/drivers/platform/x86/amd/pmf/core.c
@@ -289,6 +289,7 @@  static int amd_pmf_remove(struct platform_device *pdev)
 
 	mutex_destroy(&dev->lock);
 	amd_pmf_deinit_features(dev);
+	apmf_acpi_deinit(dev);
 	amd_pmf_dbgfs_unregister(dev);
 	kfree(dev->buf);
 	return 0;
diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
index 77021ef4bfde..504e1ae79706 100644
--- a/drivers/platform/x86/amd/pmf/pmf.h
+++ b/drivers/platform/x86/amd/pmf/pmf.h
@@ -17,6 +17,7 @@ 
 /* APMF Functions */
 #define APMF_FUNC_VERIFY_INTERFACE			0
 #define APMF_FUNC_GET_SYS_PARAMS			1
+#define APMF_FUNC_SBIOS_HEARTBEAT			4
 #define APMF_FUNC_STATIC_SLIDER_GRANULAR	9
 
 /* Message Definitions */
@@ -43,12 +44,18 @@ 
 /* AMD PMF BIOS interfaces */
 struct apmf_if_functions {
 	bool system_params;
+	bool sbios_heartbeat;
 	bool static_slider_granular;
 };
 
+struct apmf_notification_cfg {
+	int hb_interval; /* SBIOS heartbeat interval */
+};
+
 struct apmf_if {
 	acpi_handle handle;
 	struct apmf_if_functions func;
+	struct apmf_notification_cfg notify_cfg;
 };
 
 struct apmf_verify_interface {
@@ -63,6 +70,7 @@  struct apmf_system_params {
 	u32 valid_mask;
 	u32 flags;
 	u8 command_code;
+	u32 heartbeat_int;
 } __packed;
 
 enum amd_stt_skin_temp {
@@ -101,6 +109,7 @@  struct amd_pmf_dev {
 	struct apmf_if *apmf_if;
 	enum platform_profile_option current_profile;
 	struct platform_profile_handler pprof;
+	struct delayed_work heart_beat;
 	struct mutex lock; /* protects the PMF interface */
 #if IS_ENABLED(CONFIG_DEBUG_FS)
 	struct dentry *dbgfs_dir;
@@ -130,6 +139,7 @@  struct amd_pmf_static_slider_granular {
 
 /* Core Layer */
 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev);
+void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev);
 int is_apmf_func_supported(unsigned long index);
 int amd_pmf_send_cmd(struct amd_pmf_dev *dev, u8 message, bool get, u32 arg, u32 *data);
 int amd_pmf_get_power_source(void);