linux-kernel - [PATCH 3/4] drm/etnaviv: add total hi bandwidth perfcounter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 14 Aug 2020 11:05:03 +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 3/4] drm/etnaviv: add total hi bandwidth perfcounter

These two perf counters represent the total read and write
GPU bandwidth in terms of 64bits.

The used sequence was taken from Vivante kernel driver.

Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_perfmon.c | 35 ++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
index 782732e6ce72..b37459f022d7 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
@@ -69,6 +69,29 @@ static u32 pipe_perf_reg_read(struct etnaviv_gpu *gpu,
 	return value;
 }
 
+static u32 pipe_reg_read(struct etnaviv_gpu *gpu,
+	const struct etnaviv_pm_domain *domain,
+	const struct etnaviv_pm_signal *signal)
+{
+	u32 clock = gpu_read(gpu, VIVS_HI_CLOCK_CONTROL);
+	u32 value = 0;
+	unsigned i;
+
+	for (i = 0; i < gpu->identity.pixel_pipes; i++) {
+		clock &= ~(VIVS_HI_CLOCK_CONTROL_DEBUG_PIXEL_PIPE__MASK);
+		clock |= VIVS_HI_CLOCK_CONTROL_DEBUG_PIXEL_PIPE(i);
+		gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, clock);
+		value += gpu_read(gpu, signal->data);
+	}
+
+	/* switch back to pixel pipe 0 to prevent GPU hang */
+	clock &= ~(VIVS_HI_CLOCK_CONTROL_DEBUG_PIXEL_PIPE__MASK);
+	clock |= VIVS_HI_CLOCK_CONTROL_DEBUG_PIXEL_PIPE(0);
+	gpu_write(gpu, VIVS_HI_CLOCK_CONTROL, clock);
+
+	return value;
+}
+
 static u32 hi_total_cycle_read(struct etnaviv_gpu *gpu,
 	const struct etnaviv_pm_domain *domain,
 	const struct etnaviv_pm_signal *signal)
@@ -102,8 +125,18 @@ static const struct etnaviv_pm_domain doms_3d[] = {
 		.name = "HI",
 		.profile_read = VIVS_MC_PROFILE_HI_READ,
 		.profile_config = VIVS_MC_PROFILE_CONFIG2,
-		.nr_signals = 5,
+		.nr_signals = 7,
 		.signal = (const struct etnaviv_pm_signal[]) {
+			{
+				"TOTAL_READ_BYTES8",
+				VIVS_HI_PROFILE_READ_BYTES8,
+				&pipe_reg_read,
+			},
+			{
+				"TOTAL_WRITE_BYTES8",
+				VIVS_HI_PROFILE_WRITE_BYTES8,
+				&pipe_reg_read,
+			},
 			{
 				"TOTAL_CYCLES",
 				0,
-- 
2.26.2