linux-kernel - [PATCH 4/4] drm/etnaviv: export loadavg via perfmon

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Date:   Fri, 10 Jul 2020 09:41:27 +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 4/4] drm/etnaviv: export loadavg via perfmon

Make it possible to access the sub-GPU component load value from
user space with the perfmon infrastructure.

Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 79 +++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
index 75f9db8f7bec..614d86e2802d 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
@@ -98,6 +98,19 @@ static u32 hi_total_idle_cycle_read(struct etnaviv_gpu *gpu,
 	return gpu_read(gpu, reg);
 }
 
+static u32 load_read(struct etnaviv_gpu *gpu,
+	const struct etnaviv_pm_domain *domain,
+	const struct etnaviv_pm_signal *signal)
+{
+	u32 load;
+
+	spin_lock_bh(&gpu->loadavg_spinlock);
+	load = gpu->loadavg_percentage[signal->data];
+	spin_unlock_bh(&gpu->loadavg_spinlock);
+
+	return load;
+}
+
 static const struct etnaviv_pm_domain doms_3d[] = {
 	{
 		.name = "HI",
@@ -387,6 +400,72 @@ static const struct etnaviv_pm_domain doms_3d[] = {
 				&perf_reg_read
 			}
 		}
+	},
+	{
+		.name = "LOAD",
+		.nr_signals = 12,
+		.signal = (const struct etnaviv_pm_signal[]) {
+			{
+				"FE",
+				0,
+				&load_read
+			},
+			{
+				"DE",
+				1,
+				&load_read
+			},
+			{
+				"PE",
+				2,
+				&load_read
+			},
+			{
+				"SH",
+				3,
+				&load_read
+			},
+			{
+				"PA",
+				4,
+				&load_read
+			},
+			{
+				"SE",
+				5,
+				&load_read
+			},
+			{
+				"RA",
+				6,
+				&load_read
+			},
+			{
+				"TX",
+				7,
+				&load_read
+			},
+			{
+				"VG",
+				8,
+				&load_read
+			},
+			{
+				"IM",
+				9,
+				&load_read
+			},
+			{
+				"FP",
+				10,
+				&load_read
+			},
+			{
+				"TS",
+				11,
+				&load_read
+			}
+		}
 	}
 };
 
-- 
2.26.2