[PATCH v3 0/4] Exynos5 DMC interrupt mode

[PATCH v3 0/4] Exynos5 DMC interrupt mode

[Lukasz Luba]

Hi all,

This is a v3 patch set for the Exynos5 Dynamic Memory Controller
driver which could be found in Krzysztof's for-next branch [1].

It adds interrupt mode which does not relay on devfreq polling.
Instead of checking the device state by the framework, driver uses local
performance event counters which could trigger interrupt when overflow.
Thanks to this approach the driver avoids issues present in devfreq framework,
when default polling check does not occur.
The algorithm calculates 'busy_time' and 'total_time' needed for devfreq
governors (simple_ondemand) based on requests transactions traffic.

Changes:
v3:
- added information in bindings about interrupt names, since the code is
  sensitive for it as pointed out by Krzysztof
v2:
  changes suggested by Krzysztof
- added interrupt line for the channel 1
- added description for bindings with interrupt lines
- fixed fallback path in probe function
- added comments, blank lines, removed unneeded dev_dbg() in irq handler

Regards,
Lukasz Luba

[1] https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux.git/log/?h=for-next

Lukasz Luba (4):
  dt-bindings: memory-controllers: Add Exynos5422 DMC interrupts
    description
  ARM: dts: exynos: Add interrupt to DMC controller in Exynos5422
  ARM: dts: exynos: map 0x10000 SFR instead of 0x100 in DMC Exynos5422
  memory: samsung: exynos5422-dmc: Add support for interrupt from
    performance counters

 .../memory-controllers/exynos5422-dmc.txt     |  11 +
 arch/arm/boot/dts/exynos5420.dtsi             |   5 +-
 drivers/memory/samsung/exynos5422-dmc.c       | 345 ++++++++++++++++--
 3 files changed, 335 insertions(+), 26 deletions(-)

-- 
2.17.1


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[PATCH v3 1/4] dt-bindings: memory-controllers: Add Exynos5422 DMC interrupts description

[Lukasz Luba]

Add description for optional interrupt lines. It provides a new operation
mode, which uses internal performance counters interrupt when overflow.
This is more reliable than using default polling mode implemented in
devfreq.

Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
---
 .../bindings/memory-controllers/exynos5422-dmc.txt    | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt b/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
index 02aeb3b5a820..e2434cac4858 100644
--- a/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
+++ b/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt
@@ -31,6 +31,14 @@ Required properties for DMC device for Exynos5422:
 	The register offsets are in the driver code and specyfic for this SoC
 	type.
 
+Optional properties for DMC device for Exynos5422:
+- interrupt-parent : The parent interrupt controller.
+- interrupts : Contains the IRQ line numbers for the DMC internal performance
+  event counters in DREX0 and DREX1 channels. Align with specification of the
+  interrupt line(s) in the interrupt-parent controller.
+- interrupt-names : IRQ names "drex_0" and "drex_1", the order should be the
+  same as in the 'interrupts' list above.
+
 Example:
 
 	ppmu_dmc0_0: ppmu@10d00000 {
@@ -70,4 +78,7 @@ Example:
 		device-handle = <&samsung_K3QF2F20DB>;
 		vdd-supply = <&buck1_reg>;
 		samsung,syscon-clk = <&clock>;
+		interrupt-parent = <&combiner>;
+		interrupts = <16 0>, <16 1>;
+		interrupt-names = "drex_0", "drex_1";
 	};
-- 
2.17.1


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Re: [PATCH v3 1/4] dt-bindings: memory-controllers: Add Exynos5422 DMC interrupts description

[Krzysztof Kozlowski]

On Wed, Oct 02, 2019 at 08:04:52AM +0200, Lukasz Luba wrote:
> Add description for optional interrupt lines. It provides a new operation
> mode, which uses internal performance counters interrupt when overflow.
> This is more reliable than using default polling mode implemented in
> devfreq.
> 
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
>  .../bindings/memory-controllers/exynos5422-dmc.txt    | 11 +++++++++++

Thanks, applied.

Best regards,
Krzysztof


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[PATCH v3 2/4] ARM: dts: exynos: Add interrupt to DMC controller in Exynos5422

[Lukasz Luba]

Add interrupt to Dynamic Memory Controller in Exynos5422 and Odroid
XU3-family boards. It will be used instead of devfreq polling mode
governor. The interrupt is connected to performance counters private
for DMC, which might track utilisation of the memory channels.

Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
---
 arch/arm/boot/dts/exynos5420.dtsi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
index 92c5e0d8a824..98f6c71f57d8 100644
--- a/arch/arm/boot/dts/exynos5420.dtsi
+++ b/arch/arm/boot/dts/exynos5420.dtsi
@@ -240,6 +240,9 @@
 		dmc: memory-controller@10c20000 {
 			compatible = "samsung,exynos5422-dmc";
 			reg = <0x10c20000 0x100>, <0x10c30000 0x100>;
+			interrupt-parent = <&combiner>;
+			interrupts = <16 0>, <16 1>;
+			interrupt-names = "drex_0", "drex_1";
 			clocks = <&clock CLK_FOUT_SPLL>,
 				 <&clock CLK_MOUT_SCLK_SPLL>,
 				 <&clock CLK_FF_DOUT_SPLL2>,
-- 
2.17.1


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Re: [PATCH v3 2/4] ARM: dts: exynos: Add interrupt to DMC controller in Exynos5422

[Krzysztof Kozlowski]

On Wed, Oct 02, 2019 at 08:04:53AM +0200, Lukasz Luba wrote:
> Add interrupt to Dynamic Memory Controller in Exynos5422 and Odroid
> XU3-family boards. It will be used instead of devfreq polling mode
> governor. The interrupt is connected to performance counters private
> for DMC, which might track utilisation of the memory channels.
> 
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
>  arch/arm/boot/dts/exynos5420.dtsi | 3 +++

Thanks, applied.

Best regards,
Krzysztof


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[PATCH v3 3/4] ARM: dts: exynos: map 0x10000 SFR instead of 0x100 in DMC Exynos5422

[Lukasz Luba]

There is a need to access registers at address offset near 0x10000.
These registers are private DMC performance counters, which might be used
as interrupt trigger when overflow. Potential usage is to skip polling
in devfreq framework and switch to interrupt managed bandwidth control.

Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
---
 arch/arm/boot/dts/exynos5420.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi
index 98f6c71f57d8..c829bbdc5711 100644
--- a/arch/arm/boot/dts/exynos5420.dtsi
+++ b/arch/arm/boot/dts/exynos5420.dtsi
@@ -239,7 +239,7 @@
 
 		dmc: memory-controller@10c20000 {
 			compatible = "samsung,exynos5422-dmc";
-			reg = <0x10c20000 0x100>, <0x10c30000 0x100>;
+			reg = <0x10c20000 0x10000>, <0x10c30000 0x10000>;
 			interrupt-parent = <&combiner>;
 			interrupts = <16 0>, <16 1>;
 			interrupt-names = "drex_0", "drex_1";
-- 
2.17.1


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Re: [PATCH v3 3/4] ARM: dts: exynos: map 0x10000 SFR instead of 0x100 in DMC Exynos5422

[Krzysztof Kozlowski]

On Wed, Oct 02, 2019 at 08:04:54AM +0200, Lukasz Luba wrote:
> There is a need to access registers at address offset near 0x10000.
> These registers are private DMC performance counters, which might be used
> as interrupt trigger when overflow. Potential usage is to skip polling
> in devfreq framework and switch to interrupt managed bandwidth control.
> 
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
>  arch/arm/boot/dts/exynos5420.dtsi | 2 +-

Thanks, applied but re-ordered with previous one. Applying first
interrupts enables the interrupt mode which does not make sense without
extended mapping

Best regards,
Krzysztof


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[PATCH v3 4/4] memory: samsung: exynos5422-dmc: Add support for interrupt from performance counters

[Lukasz Luba]

Introduce a new interrupt driven mechanism for managing speed of the
memory controller. The interrupts are generated due to performance
counters overflow. The performance counters might track memory reads,
writes, transfers, page misses, etc. In the basic algorithm tracking
read transfers and calculating memory pressure should be enough to
skip polling mode in devfreq.

Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
---
 drivers/memory/samsung/exynos5422-dmc.c | 345 ++++++++++++++++++++++--
 1 file changed, 320 insertions(+), 25 deletions(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 0fe5f2186139..47dbf6d1789f 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -8,6 +8,7 @@
 #include <linux/devfreq.h>
 #include <linux/devfreq-event.h>
 #include <linux/device.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
@@ -35,6 +36,61 @@
 #define USE_BPLL_TIMINGS			(0)
 #define EXYNOS5_AREF_NORMAL			(0x2e)
 
+#define DREX_PPCCLKCON		(0x0130)
+#define DREX_PEREV2CONFIG	(0x013c)
+#define DREX_PMNC_PPC		(0xE000)
+#define DREX_CNTENS_PPC		(0xE010)
+#define DREX_CNTENC_PPC		(0xE020)
+#define DREX_INTENS_PPC		(0xE030)
+#define DREX_INTENC_PPC		(0xE040)
+#define DREX_FLAG_PPC		(0xE050)
+#define DREX_PMCNT2_PPC		(0xE130)
+
+/*
+ * A value for register DREX_PMNC_PPC which should be written to reset
+ * the cycle counter CCNT (a reference wall clock). It sets zero to the
+ * CCNT counter.
+ */
+#define CC_RESET		BIT(2)
+
+/*
+ * A value for register DREX_PMNC_PPC which does the reset of all performance
+ * counters to zero.
+ */
+#define PPC_COUNTER_RESET	BIT(1)
+
+/*
+ * Enables all configured counters (including cycle counter). The value should
+ * be written to the register DREX_PMNC_PPC.
+ */
+#define PPC_ENABLE		BIT(0)
+
+/* A value for register DREX_PPCCLKCON which enables performance events clock.
+ * Must be written before first access to the performance counters register
+ * set, otherwise it could crash.
+ */
+#define PEREV_CLK_EN		BIT(0)
+
+/*
+ * Values which are used to enable counters, interrupts or configure flags of
+ * the performance counters. They configure counter 2 and cycle counter.
+ */
+#define PERF_CNT2		BIT(2)
+#define PERF_CCNT		BIT(31)
+
+/*
+ * Performance event types which are used for setting the preferred event
+ * to track in the counters.
+ * There is a set of different types, the values are from range 0 to 0x6f.
+ * These settings should be written to the configuration register which manages
+ * the type of the event (register DREX_PEREV2CONFIG).
+ */
+#define READ_TRANSFER_CH0	(0x6d)
+#define READ_TRANSFER_CH1	(0x6f)
+
+#define PERF_COUNTER_START_VALUE 0xff000000
+#define PERF_EVENT_UP_DOWN_THRESHOLD 900000000ULL
+
 /**
  * struct dmc_opp_table - Operating level desciption
  *
@@ -85,6 +141,10 @@ struct exynos5_dmc {
 	struct clk *mout_mx_mspll_ccore_phy;
 	struct devfreq_event_dev **counter;
 	int num_counters;
+	u64 last_overflow_ts[2];
+	unsigned long load;
+	unsigned long total;
+	bool in_irq_mode;
 };
 
 #define TIMING_FIELD(t_name, t_bit_beg, t_bit_end) \
@@ -653,6 +713,173 @@ static int exynos5_counters_get(struct exynos5_dmc *dmc,
 	return 0;
 }
 
+/**
+ * exynos5_dmc_start_perf_events() - Setup and start performance event counters
+ * @dmc:	device for which the counters are going to be checked
+ * @beg_value:	initial value for the counter
+ *
+ * Function which enables needed counters, interrupts and sets initial values
+ * then starts the counters.
+ */
+static void exynos5_dmc_start_perf_events(struct exynos5_dmc *dmc,
+					  u32 beg_value)
+{
+	/* Enable interrupts for counter 2 */
+	writel(PERF_CNT2, dmc->base_drexi0 + DREX_INTENS_PPC);
+	writel(PERF_CNT2, dmc->base_drexi1 + DREX_INTENS_PPC);
+
+	/* Enable counter 2 and CCNT  */
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi0 + DREX_CNTENS_PPC);
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi1 + DREX_CNTENS_PPC);
+
+	/* Clear overflow flag for all counters */
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi0 + DREX_FLAG_PPC);
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi1 + DREX_FLAG_PPC);
+
+	/* Reset all counters */
+	writel(CC_RESET | PPC_COUNTER_RESET, dmc->base_drexi0 + DREX_PMNC_PPC);
+	writel(CC_RESET | PPC_COUNTER_RESET, dmc->base_drexi1 + DREX_PMNC_PPC);
+
+	/*
+	 * Set start value for the counters, the number of samples that
+	 * will be gathered is calculated as: 0xffffffff - beg_value
+	 */
+	writel(beg_value, dmc->base_drexi0 + DREX_PMCNT2_PPC);
+	writel(beg_value, dmc->base_drexi1 + DREX_PMCNT2_PPC);
+
+	/* Start all counters */
+	writel(PPC_ENABLE, dmc->base_drexi0 + DREX_PMNC_PPC);
+	writel(PPC_ENABLE, dmc->base_drexi1 + DREX_PMNC_PPC);
+}
+
+/**
+ * exynos5_dmc_perf_events_calc() - Calculate utilization
+ * @dmc:	device for which the counters are going to be checked
+ * @diff_ts:	time between last interrupt and current one
+ *
+ * Function which calculates needed utilization for the devfreq governor.
+ * It prepares values for 'busy_time' and 'total_time' based on elapsed time
+ * between interrupts, which approximates utilization.
+ */
+static void exynos5_dmc_perf_events_calc(struct exynos5_dmc *dmc, u64 diff_ts)
+{
+	/*
+	 * This is a simple algorithm for managing traffic on DMC.
+	 * When there is almost no load the counters overflow every 4s,
+	 * no mater the DMC frequency.
+	 * The high load might be approximated using linear function.
+	 * Knowing that, simple calculation can provide 'busy_time' and
+	 * 'total_time' to the devfreq governor which picks up target
+	 * frequency.
+	 * We want a fast ramp up and slow decay in frequency change function.
+	 */
+	if (diff_ts < PERF_EVENT_UP_DOWN_THRESHOLD) {
+		/*
+		 * Set higher utilization for the simple_ondemand governor.
+		 * The governor should increase the frequency of the DMC.
+		 */
+		dmc->load = 70;
+		dmc->total = 100;
+	} else {
+		/*
+		 * Set low utilization for the simple_ondemand governor.
+		 * The governor should decrease the frequency of the DMC.
+		 */
+		dmc->load = 35;
+		dmc->total = 100;
+	}
+
+	dev_dbg(dmc->dev, "diff_ts=%llu\n", diff_ts);
+}
+
+/**
+ * exynos5_dmc_perf_events_check() - Checks the status of the counters
+ * @dmc:	device for which the counters are going to be checked
+ *
+ * Function which is called from threaded IRQ to check the counters state
+ * and to call approximation for the needed utilization.
+ */
+static void exynos5_dmc_perf_events_check(struct exynos5_dmc *dmc)
+{
+	u32 val;
+	u64 diff_ts, ts;
+
+	ts = ktime_get_ns();
+
+	/* Stop all counters */
+	writel(0, dmc->base_drexi0 + DREX_PMNC_PPC);
+	writel(0, dmc->base_drexi1 + DREX_PMNC_PPC);
+
+	/* Check the source in interrupt flag registers (which channel) */
+	val = readl(dmc->base_drexi0 + DREX_FLAG_PPC);
+	if (val) {
+		diff_ts = ts - dmc->last_overflow_ts[0];
+		dmc->last_overflow_ts[0] = ts;
+		dev_dbg(dmc->dev, "drex0 0xE050 val= 0x%08x\n",  val);
+	} else {
+		val = readl(dmc->base_drexi1 + DREX_FLAG_PPC);
+		diff_ts = ts - dmc->last_overflow_ts[1];
+		dmc->last_overflow_ts[1] = ts;
+		dev_dbg(dmc->dev, "drex1 0xE050 val= 0x%08x\n",  val);
+	}
+
+	exynos5_dmc_perf_events_calc(dmc, diff_ts);
+
+	exynos5_dmc_start_perf_events(dmc, PERF_COUNTER_START_VALUE);
+}
+
+/**
+ * exynos5_dmc_enable_perf_events() - Enable performance events
+ * @dmc:	device for which the counters are going to be checked
+ *
+ * Function which is setup needed environment and enables counters.
+ */
+static void exynos5_dmc_enable_perf_events(struct exynos5_dmc *dmc)
+{
+	u64 ts;
+
+	/* Enable Performance Event Clock */
+	writel(PEREV_CLK_EN, dmc->base_drexi0 + DREX_PPCCLKCON);
+	writel(PEREV_CLK_EN, dmc->base_drexi1 + DREX_PPCCLKCON);
+
+	/* Select read transfers as performance event2 */
+	writel(READ_TRANSFER_CH0, dmc->base_drexi0 + DREX_PEREV2CONFIG);
+	writel(READ_TRANSFER_CH1, dmc->base_drexi1 + DREX_PEREV2CONFIG);
+
+	ts = ktime_get_ns();
+	dmc->last_overflow_ts[0] = ts;
+	dmc->last_overflow_ts[1] = ts;
+
+	/* Devfreq shouldn't be faster than initialization, play safe though. */
+	dmc->load = 99;
+	dmc->total = 100;
+}
+
+/**
+ * exynos5_dmc_disable_perf_events() - Disable performance events
+ * @dmc:	device for which the counters are going to be checked
+ *
+ * Function which stops, disables performance event counters and interrupts.
+ */
+static void exynos5_dmc_disable_perf_events(struct exynos5_dmc *dmc)
+{
+	/* Stop all counters */
+	writel(0, dmc->base_drexi0 + DREX_PMNC_PPC);
+	writel(0, dmc->base_drexi1 + DREX_PMNC_PPC);
+
+	/* Disable interrupts for counter 2 */
+	writel(PERF_CNT2, dmc->base_drexi0 + DREX_INTENC_PPC);
+	writel(PERF_CNT2, dmc->base_drexi1 + DREX_INTENC_PPC);
+
+	/* Disable counter 2 and CCNT  */
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi0 + DREX_CNTENC_PPC);
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi1 + DREX_CNTENC_PPC);
+
+	/* Clear overflow flag for all counters */
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi0 + DREX_FLAG_PPC);
+	writel(PERF_CNT2 | PERF_CCNT, dmc->base_drexi1 + DREX_FLAG_PPC);
+}
+
 /**
  * exynos5_dmc_get_status() - Read current DMC performance statistics.
  * @dev:	device for which the statistics are requested
@@ -669,18 +896,24 @@ static int exynos5_dmc_get_status(struct device *dev,
 	unsigned long load, total;
 	int ret;
 
-	ret = exynos5_counters_get(dmc, &load, &total);
-	if (ret < 0)
-		return -EINVAL;
+	if (dmc->in_irq_mode) {
+		stat->current_frequency = dmc->curr_rate;
+		stat->busy_time = dmc->load;
+		stat->total_time = dmc->total;
+	} else {
+		ret = exynos5_counters_get(dmc, &load, &total);
+		if (ret < 0)
+			return -EINVAL;
 
-	/* To protect from overflow in calculation ratios, divide by 1024 */
-	stat->busy_time = load >> 10;
-	stat->total_time = total >> 10;
+		/* To protect from overflow, divide by 1024 */
+		stat->busy_time = load >> 10;
+		stat->total_time = total >> 10;
 
-	ret = exynos5_counters_set_event(dmc);
-	if (ret < 0) {
-		dev_err(dev, "could not set event counter\n");
-		return ret;
+		ret = exynos5_counters_set_event(dmc);
+		if (ret < 0) {
+			dev_err(dev, "could not set event counter\n");
+			return ret;
+		}
 	}
 
 	return 0;
@@ -712,7 +945,6 @@ static int exynos5_dmc_get_cur_freq(struct device *dev, unsigned long *freq)
  * It provides to the devfreq framework needed functions and polling period.
  */
 static struct devfreq_dev_profile exynos5_dmc_df_profile = {
-	.polling_ms = 500,
 	.target = exynos5_dmc_target,
 	.get_dev_status = exynos5_dmc_get_status,
 	.get_cur_freq = exynos5_dmc_get_cur_freq,
@@ -1108,6 +1340,24 @@ static inline int exynos5_dmc_set_pause_on_switching(struct exynos5_dmc *dmc)
 	return 0;
 }
 
+static irqreturn_t dmc_irq_thread(int irq, void *priv)
+{
+	int res;
+	struct exynos5_dmc *dmc = priv;
+
+	mutex_lock(&dmc->df->lock);
+
+	exynos5_dmc_perf_events_check(dmc);
+
+	res = update_devfreq(dmc->df);
+	if (res)
+		dev_warn(dmc->dev, "devfreq failed with %d\n", res);
+
+	mutex_unlock(&dmc->df->lock);
+
+	return IRQ_HANDLED;
+}
+
 /**
  * exynos5_dmc_probe() - Probe function for the DMC driver
  * @pdev:	platform device for which the driver is going to be initialized
@@ -1125,6 +1375,7 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	struct exynos5_dmc *dmc;
 	struct resource *res;
+	int irq[2];
 
 	dmc = devm_kzalloc(dev, sizeof(*dmc), GFP_KERNEL);
 	if (!dmc)
@@ -1172,24 +1423,59 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
 		goto remove_clocks;
 	}
 
-	ret = exynos5_performance_counters_init(dmc);
+	ret = exynos5_dmc_set_pause_on_switching(dmc);
 	if (ret) {
-		dev_warn(dev, "couldn't probe performance counters\n");
+		dev_warn(dev, "couldn't get access to PAUSE register\n");
 		goto remove_clocks;
 	}
 
-	ret = exynos5_dmc_set_pause_on_switching(dmc);
-	if (ret) {
-		dev_warn(dev, "couldn't get access to PAUSE register\n");
-		goto err_devfreq_add;
+	/* There is two modes in which the driver works: polling or IRQ */
+	irq[0] = platform_get_irq_byname(pdev, "drex_0");
+	irq[1] = platform_get_irq_byname(pdev, "drex_1");
+	if (irq[0] > 0 && irq[1] > 0) {
+		ret = devm_request_threaded_irq(dev, irq[0], NULL,
+						dmc_irq_thread, IRQF_ONESHOT,
+						dev_name(dev), dmc);
+		if (ret) {
+			dev_err(dev, "couldn't grab IRQ\n");
+			goto remove_clocks;
+		}
+
+		ret = devm_request_threaded_irq(dev, irq[1], NULL,
+						dmc_irq_thread, IRQF_ONESHOT,
+						dev_name(dev), dmc);
+		if (ret) {
+			dev_err(dev, "couldn't grab IRQ\n");
+			goto remove_clocks;
+		}
+
+		/*
+		 * Setup default thresholds for the devfreq governor.
+		 * The values are chosen based on experiments.
+		 */
+		dmc->gov_data.upthreshold = 55;
+		dmc->gov_data.downdifferential = 5;
+
+		exynos5_dmc_enable_perf_events(dmc);
+
+		dmc->in_irq_mode = 1;
+	} else {
+		ret = exynos5_performance_counters_init(dmc);
+		if (ret) {
+			dev_warn(dev, "couldn't probe performance counters\n");
+			goto remove_clocks;
+		}
+
+		/*
+		 * Setup default thresholds for the devfreq governor.
+		 * The values are chosen based on experiments.
+		 */
+		dmc->gov_data.upthreshold = 30;
+		dmc->gov_data.downdifferential = 5;
+
+		exynos5_dmc_df_profile.polling_ms = 500;
 	}
 
-	/*
-	 * Setup default thresholds for the devfreq governor.
-	 * The values are chosen based on experiments.
-	 */
-	dmc->gov_data.upthreshold = 30;
-	dmc->gov_data.downdifferential = 5;
 
 	dmc->df = devm_devfreq_add_device(dev, &exynos5_dmc_df_profile,
 					  DEVFREQ_GOV_SIMPLE_ONDEMAND,
@@ -1200,12 +1486,18 @@ static int exynos5_dmc_probe(struct platform_device *pdev)
 		goto err_devfreq_add;
 	}
 
+	if (dmc->in_irq_mode)
+		exynos5_dmc_start_perf_events(dmc, PERF_COUNTER_START_VALUE);
+
 	dev_info(dev, "DMC initialized\n");
 
 	return 0;
 
 err_devfreq_add:
-	exynos5_counters_disable_edev(dmc);
+	if (dmc->in_irq_mode)
+		exynos5_dmc_disable_perf_events(dmc);
+	else
+		exynos5_counters_disable_edev(dmc);
 remove_clocks:
 	clk_disable_unprepare(dmc->mout_bpll);
 	clk_disable_unprepare(dmc->fout_bpll);
@@ -1225,7 +1517,10 @@ static int exynos5_dmc_remove(struct platform_device *pdev)
 {
 	struct exynos5_dmc *dmc = dev_get_drvdata(&pdev->dev);
 
-	exynos5_counters_disable_edev(dmc);
+	if (dmc->in_irq_mode)
+		exynos5_dmc_disable_perf_events(dmc);
+	else
+		exynos5_counters_disable_edev(dmc);
 
 	clk_disable_unprepare(dmc->mout_bpll);
 	clk_disable_unprepare(dmc->fout_bpll);
-- 
2.17.1


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Re: [PATCH v3 4/4] memory: samsung: exynos5422-dmc: Add support for interrupt from performance counters

[Krzysztof Kozlowski]

On Wed, Oct 02, 2019 at 08:04:55AM +0200, Lukasz Luba wrote:
> Introduce a new interrupt driven mechanism for managing speed of the
> memory controller. The interrupts are generated due to performance
> counters overflow. The performance counters might track memory reads,
> writes, transfers, page misses, etc. In the basic algorithm tracking
> read transfers and calculating memory pressure should be enough to
> skip polling mode in devfreq.
> 
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
>  drivers/memory/samsung/exynos5422-dmc.c | 345 ++++++++++++++++++++++--

Thanks, applied.

Best regards,
Krzysztof


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