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Message-Id: <20200710074143.306787-3-christian.gmeiner@gmail.com>
Date: Fri, 10 Jul 2020 09:41:25 +0200
From: Christian Gmeiner <christian.gmeiner@...il.com>
To: linux-kernel@...r.kernel.org
Cc: cphealy@...il.com, Christian Gmeiner <christian.gmeiner@...il.com>,
Lucas Stach <l.stach@...gutronix.de>,
Russell King <linux+etnaviv@...linux.org.uk>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>, etnaviv@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH 2/4] drm/etnaviv: add loadavg accounting
The GPU has an idle state register where each bit represents the idle
state of a sub-GPU component like FE or TX. Sample this register
every 10ms and calculate a simple moving average over the sub-GPU
component idle states with a total observation time frame of 1s.
This provides us with a percentage based load of each sub-GPU
component.
Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
---
drivers/gpu/drm/etnaviv/etnaviv_drv.c | 14 ++++++++++++
drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 32 +++++++++++++++++++++++++++
drivers/gpu/drm/etnaviv/etnaviv_gpu.h | 29 ++++++++++++++++++++++++
3 files changed, 75 insertions(+)
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index f9afe11c50f0..b31920241c86 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -46,6 +46,19 @@ static void load_gpu(struct drm_device *dev)
}
}
+static void unload_gpu(struct drm_device *dev)
+{
+ struct etnaviv_drm_private *priv = dev->dev_private;
+ unsigned int i;
+
+ for (i = 0; i < ETNA_MAX_PIPES; i++) {
+ struct etnaviv_gpu *g = priv->gpu[i];
+
+ if (g)
+ etnaviv_gpu_shutdown(g);
+ }
+}
+
static int etnaviv_open(struct drm_device *dev, struct drm_file *file)
{
struct etnaviv_drm_private *priv = dev->dev_private;
@@ -581,6 +594,7 @@ static void etnaviv_unbind(struct device *dev)
struct drm_device *drm = dev_get_drvdata(dev);
struct etnaviv_drm_private *priv = drm->dev_private;
+ unload_gpu(drm);
drm_dev_unregister(drm);
component_unbind_all(dev, drm);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index a31eeff2b297..1f0eb7e00657 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -714,6 +714,28 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
gpu_write(gpu, VIVS_HI_INTR_ENBL, ~0U);
}
+static void etnaviv_loadavg_function(struct timer_list *t)
+{
+ struct etnaviv_gpu *gpu = from_timer(gpu, t, loadavg_timer);
+ const u32 idle = gpu_read(gpu, VIVS_HI_IDLE_STATE);
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(etna_idle_module_names); i++)
+ if ((idle & etna_idle_module_names[i].bit))
+ sma_loadavg_add(&gpu->loadavg_value[i], 0);
+ else
+ sma_loadavg_add(&gpu->loadavg_value[i], 100);
+
+ spin_lock_bh(&gpu->loadavg_spinlock);
+
+ for (i = 0; i < ARRAY_SIZE(etna_idle_module_names); i++)
+ gpu->loadavg_percentage[i] = sma_loadavg_read(&gpu->loadavg_value[i]);
+
+ spin_unlock_bh(&gpu->loadavg_spinlock);
+
+ mod_timer(t, jiffies + msecs_to_jiffies(10));
+}
+
int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
{
struct etnaviv_drm_private *priv = gpu->drm->dev_private;
@@ -804,6 +826,10 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
for (i = 0; i < ARRAY_SIZE(gpu->event); i++)
complete(&gpu->event_free);
+ /* Setup loadavg timer */
+ timer_setup(&gpu->loadavg_timer, etnaviv_loadavg_function, 0);
+ mod_timer(&gpu->loadavg_timer, jiffies + msecs_to_jiffies(10));
+
/* Now program the hardware */
mutex_lock(&gpu->lock);
etnaviv_gpu_hw_init(gpu);
@@ -824,6 +850,11 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
return ret;
}
+void etnaviv_gpu_shutdown(struct etnaviv_gpu *gpu)
+{
+ del_timer(&gpu->loadavg_timer);
+}
+
#ifdef CONFIG_DEBUG_FS
struct dma_debug {
u32 address[2];
@@ -1762,6 +1793,7 @@ static int etnaviv_gpu_platform_probe(struct platform_device *pdev)
gpu->dev = &pdev->dev;
mutex_init(&gpu->lock);
mutex_init(&gpu->fence_lock);
+ spin_lock_init(&gpu->loadavg_spinlock);
/* Map registers: */
gpu->mmio = devm_platform_ioremap_resource(pdev, 0);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
index 8ea48697d132..a5b9c89c6744 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
@@ -10,6 +10,8 @@
#include "etnaviv_gem.h"
#include "etnaviv_mmu.h"
#include "etnaviv_drv.h"
+#include "etnaviv_sma.h"
+#include "state_hi.xml.h"
struct etnaviv_gem_submit;
struct etnaviv_vram_mapping;
@@ -91,6 +93,26 @@ struct clk;
#define ETNA_NR_EVENTS 30
+DECLARE_SMA(loadavg, 100)
+
+static const struct {
+ const char *name;
+ u32 bit;
+} etna_idle_module_names[] = {
+ { "FE", VIVS_HI_IDLE_STATE_FE },
+ { "DE", VIVS_HI_IDLE_STATE_DE },
+ { "PE", VIVS_HI_IDLE_STATE_PE },
+ { "SH", VIVS_HI_IDLE_STATE_SH },
+ { "PA", VIVS_HI_IDLE_STATE_PA },
+ { "SE", VIVS_HI_IDLE_STATE_SE },
+ { "RA", VIVS_HI_IDLE_STATE_RA },
+ { "TX", VIVS_HI_IDLE_STATE_TX },
+ { "VG", VIVS_HI_IDLE_STATE_VG },
+ { "IM", VIVS_HI_IDLE_STATE_IM },
+ { "FP", VIVS_HI_IDLE_STATE_FP },
+ { "TS", VIVS_HI_IDLE_STATE_TS },
+};
+
struct etnaviv_gpu {
struct drm_device *drm;
struct thermal_cooling_device *cooling;
@@ -145,6 +167,12 @@ struct etnaviv_gpu {
unsigned int freq_scale;
unsigned long base_rate_core;
unsigned long base_rate_shader;
+
+ /* Loadavg: */
+ struct timer_list loadavg_timer;
+ spinlock_t loadavg_spinlock;
+ struct sma_loadavg loadavg_value[ARRAY_SIZE(etna_idle_module_names)];
+ unsigned int loadavg_percentage[ARRAY_SIZE(etna_idle_module_names)];
};
static inline void gpu_write(struct etnaviv_gpu *gpu, u32 reg, u32 data)
@@ -160,6 +188,7 @@ static inline u32 gpu_read(struct etnaviv_gpu *gpu, u32 reg)
int etnaviv_gpu_get_param(struct etnaviv_gpu *gpu, u32 param, u64 *value);
int etnaviv_gpu_init(struct etnaviv_gpu *gpu);
+void etnaviv_gpu_shutdown(struct etnaviv_gpu *gpu);
bool etnaviv_fill_identity_from_hwdb(struct etnaviv_gpu *gpu);
#ifdef CONFIG_DEBUG_FS
--
2.26.2
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