linux-kernel - [PATCH 6/7] thermal/drivers/int340x: Support workload hint interrupts

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Message-Id: <20230620230150.3068704-7-srinivas.pandruvada@linux.intel.com>
Date:   Tue, 20 Jun 2023 16:01:49 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     rafael@...nel.org, rui.zhang@...el.com, daniel.lezcano@...aro.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH 6/7] thermal/drivers/int340x: Support workload hint interrupts

On thermal device interrupt, if the interrupt is generated for passing
workload hint, call the callback to pass notification to the user
space.

First call proc_thermal_check_wlt_intr() to check interrupt, if this
callback returns true, wake IRQ thread. Call
proc_thermal_wlt_intr_callback() to notify user space.

While here remove function pkg_thermal_schedule_work() and move the
processing to the caller. The function pkg_thermal_schedule_work() just
called schedule_delayed_work().

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../processor_thermal_device_pci.c            | 33 ++++++++++++++-----
 1 file changed, 24 insertions(+), 9 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
index edddebedf42e..7fa5c3d459bd 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device_pci.c
@@ -115,27 +115,40 @@ static void proc_thermal_threshold_work_fn(struct work_struct *work)
 	proc_thermal_mmio_write(pci_info, PROC_THERMAL_MMIO_INT_ENABLE_0, 1);
 }
 
-static void pkg_thermal_schedule_work(struct delayed_work *work)
+static irqreturn_t proc_thermal_irq_thread_handler(int irq, void *devid)
 {
-	unsigned long ms = msecs_to_jiffies(notify_delay_ms);
+	struct proc_thermal_pci *pci_info = devid;
+
+	proc_thermal_wlt_intr_callback(pci_info->pdev, pci_info->proc_priv);
 
-	schedule_delayed_work(work, ms);
+	return IRQ_HANDLED;
 }
 
 static irqreturn_t proc_thermal_irq_handler(int irq, void *devid)
 {
 	struct proc_thermal_pci *pci_info = devid;
+	struct proc_thermal_device *proc_priv;
+	int ret = IRQ_HANDLED;
 	u32 status;
 
+	proc_priv = pci_info->proc_priv;
+
+	if (proc_priv->mmio_feature_mask & PROC_THERMAL_FEATURE_WLT_HINT) {
+		if (proc_thermal_check_wlt_intr(pci_info->proc_priv))
+			ret = IRQ_WAKE_THREAD;
+	}
+
 	proc_thermal_mmio_read(pci_info, PROC_THERMAL_MMIO_INT_STATUS_0, &status);
+	if (status) {
+		unsigned long ms = msecs_to_jiffies(notify_delay_ms);
 
-	/* Disable enable interrupt flag */
-	proc_thermal_mmio_write(pci_info, PROC_THERMAL_MMIO_INT_ENABLE_0, 0);
+		/* Disable enable interrupt flag */
+		proc_thermal_mmio_write(pci_info, PROC_THERMAL_MMIO_INT_ENABLE_0, 0);
+		schedule_delayed_work(&pci_info->work, ms);
+	}
 	pci_write_config_byte(pci_info->pdev, 0xdc, 0x01);
 
-	pkg_thermal_schedule_work(&pci_info->work);
-
-	return IRQ_HANDLED;
+	return ret;
 }
 
 static int sys_get_curr_temp(struct thermal_zone_device *tzd, int *temp)
@@ -269,7 +282,7 @@ static int proc_thermal_pci_probe(struct pci_dev *pdev, const struct pci_device_
 	}
 
 	ret = devm_request_threaded_irq(&pdev->dev, irq,
-					proc_thermal_irq_handler, NULL,
+					proc_thermal_irq_handler, proc_thermal_irq_thread_handler,
 					irq_flag, KBUILD_MODNAME, pci_info);
 	if (ret) {
 		dev_err(&pdev->dev, "Request IRQ %d failed\n", pdev->irq);
@@ -383,6 +396,8 @@ static struct pci_driver proc_thermal_pci_driver = {
 
 module_pci_driver(proc_thermal_pci_driver);
 
+MODULE_IMPORT_NS(INT340X_THERMAL);
+
 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>");
 MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver");
 MODULE_LICENSE("GPL v2");
-- 
2.38.1