platform/x86/amd/pmf: Add support to notify sbios heart beat event

Add support for newer revision of the heart beat notify events.
This event is used to notify to the OEM BIOS on driver
load/unload/suspend/resume scenarios.

If OEM BIOS does not receive the heart beat event from PMF driver, OEM
BIOS shall conclude that PMF driver is no more active and BIOS will
update to the legacy system power thermals.

Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Co-developed-by: Patil Rajesh Reddy <[email protected]>
Signed-off-by: Patil Rajesh Reddy <[email protected]>
Signed-off-by: Shyam Sundar S K <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>

Author: Shyam Sundar S K

drivers/platform/x86/amd/pmf/acpi.c

@@ -140,6 +140,43 @@ static void apmf_sbios_heartbeat_notify(struct work_struct *work)
 	kfree(info);
 }
 
+int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag)
+{
+	struct sbios_hb_event_v2 args = { };
+	struct acpi_buffer params;
+	union acpi_object *info;
+
+	args.size = sizeof(args);
+
+	switch (flag) {
+	case ON_LOAD:
+		args.load = 1;
+		break;
+	case ON_UNLOAD:
+		args.unload = 1;
+		break;
+	case ON_SUSPEND:
+		args.suspend = 1;
+		break;
+	case ON_RESUME:
+		args.resume = 1;
+		break;
+	default:
+		dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag);
+		return -EINVAL;
+	}
+
+	params.length = sizeof(args);
+	params.pointer = &args;
+
+	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, &params);
+	if (!info)
+		return -EIO;
+
+	kfree(info);
+	return 0;
+}
+
 int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
 {
 	union acpi_object *info;
@@ -327,7 +364,7 @@ void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
 {
 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
 
-	if (pmf_dev->hb_interval)
+	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
 		cancel_delayed_work_sync(&pmf_dev->heart_beat);
 
 	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
@@ -351,7 +388,7 @@ int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
 		goto out;
 	}
 
-	if (pmf_dev->hb_interval) {
+	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
 		/* 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);

drivers/platform/x86/amd/pmf/core.c

@@ -299,6 +299,9 @@ static int amd_pmf_suspend_handler(struct device *dev)
 
 	kfree(pdev->buf);
 
+	if (is_apmf_func_supported(pdev, APMF_FUNC_SBIOS_HEARTBEAT_V2))
+		amd_pmf_notify_sbios_heartbeat_event_v2(pdev, ON_SUSPEND);
+
 	return 0;
 }
 
@@ -313,6 +316,9 @@ static int amd_pmf_resume_handler(struct device *dev)
 			return ret;
 	}
 
+	if (is_apmf_func_supported(pdev, APMF_FUNC_SBIOS_HEARTBEAT_V2))
+		amd_pmf_notify_sbios_heartbeat_event_v2(pdev, ON_RESUME);
+
 	return 0;
 }
 
@@ -435,6 +441,8 @@ static int amd_pmf_probe(struct platform_device *pdev)
 	amd_pmf_dbgfs_register(dev);
 	amd_pmf_init_features(dev);
 	apmf_install_handler(dev);
+	if (is_apmf_func_supported(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2))
+		amd_pmf_notify_sbios_heartbeat_event_v2(dev, ON_LOAD);
 
 	dev_info(dev->dev, "registered PMF device successfully\n");
 
@@ -446,6 +454,8 @@ static void amd_pmf_remove(struct platform_device *pdev)
 	struct amd_pmf_dev *dev = platform_get_drvdata(pdev);
 
 	amd_pmf_deinit_features(dev);
+	if (is_apmf_func_supported(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2))
+		amd_pmf_notify_sbios_heartbeat_event_v2(dev, ON_UNLOAD);
 	apmf_acpi_deinit(dev);
 	amd_pmf_dbgfs_unregister(dev);
 	mutex_destroy(&dev->lock);

drivers/platform/x86/amd/pmf/pmf.h

@@ -34,6 +34,7 @@ struct cookie_header {
 #define APMF_FUNC_STATIC_SLIDER_GRANULAR       9
 #define APMF_FUNC_DYN_SLIDER_AC				11
 #define APMF_FUNC_DYN_SLIDER_DC				12
+#define APMF_FUNC_SBIOS_HEARTBEAT_V2			16
 
 /* Message Definitions */
 #define SET_SPL				0x03 /* SPL: Sustained Power Limit */
@@ -89,6 +90,21 @@ struct cookie_header {
 
 #define PMF_IF_V1		1
 
+struct sbios_hb_event_v2 {
+	u16 size;
+	u8 load;
+	u8 unload;
+	u8 suspend;
+	u8 resume;
+} __packed;
+
+enum sbios_hb_v2 {
+	ON_LOAD,
+	ON_UNLOAD,
+	ON_SUSPEND,
+	ON_RESUME,
+};
+
 /* AMD PMF BIOS interfaces */
 struct apmf_verify_interface {
 	u16 size;
@@ -609,6 +625,7 @@ int amd_pmf_get_power_source(void);
 int apmf_install_handler(struct amd_pmf_dev *pmf_dev);
 int apmf_os_power_slider_update(struct amd_pmf_dev *dev, u8 flag);
 int amd_pmf_set_dram_addr(struct amd_pmf_dev *dev, bool alloc_buffer);
+int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag);
 
 /* SPS Layer */
 int amd_pmf_get_pprof_modes(struct amd_pmf_dev *pmf);