drm/etnaviv: add infrastructure to query perf counter

Make it possible that userspace can query all performance domains and
its signals. This information is needed to sample those signals via
submit ioctl.

At the moment no performance domain is available.

Changes from v1 -> v2:
- use a 16 bit value for signals
- fix padding issues
- add id member to domain and signal struct

Changes v4 -> v5
- provide for each pipe an own set of pm domains

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>

4 files changed, 183 insertions, 1 deletions

diff --git a/drivers/gpu/drm/etnaviv/Makefile b/drivers/gpu/drm/etnaviv/Makefile
index 4f76c992043f..15c3bfa89a79 100644
--- a/drivers/gpu/drm/etnaviv/Makefile
+++ b/drivers/gpu/drm/etnaviv/Makefile
@@ -10,6 +10,7 @@ etnaviv-y := \
 	etnaviv_gpu.o \
 	etnaviv_iommu_v2.o \
 	etnaviv_iommu.o \
-	etnaviv_mmu.o
+	etnaviv_mmu.o \
+	etnaviv_perfmon.o
 
 obj-$(CONFIG_DRM_ETNAVIV)	+= etnaviv.o
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 2cb4773823c2..8721dc23312f 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -23,6 +23,7 @@
 #include "etnaviv_gpu.h"
 #include "etnaviv_gem.h"
 #include "etnaviv_mmu.h"
+#include "etnaviv_perfmon.h"
 
 #ifdef CONFIG_DRM_ETNAVIV_REGISTER_LOGGING
 static bool reglog;
@@ -451,6 +452,40 @@ static int etnaviv_ioctl_gem_wait(struct drm_device *dev, void *data,
 	return ret;
 }
 
+static int etnaviv_ioctl_pm_query_dom(struct drm_device *dev, void *data,
+	struct drm_file *file)
+{
+	struct etnaviv_drm_private *priv = dev->dev_private;
+	struct drm_etnaviv_pm_domain *args = data;
+	struct etnaviv_gpu *gpu;
+
+	if (args->pipe >= ETNA_MAX_PIPES)
+		return -EINVAL;
+
+	gpu = priv->gpu[args->pipe];
+	if (!gpu)
+		return -ENXIO;
+
+	return etnaviv_pm_query_dom(gpu, args);
+}
+
+static int etnaviv_ioctl_pm_query_sig(struct drm_device *dev, void *data,
+	struct drm_file *file)
+{
+	struct etnaviv_drm_private *priv = dev->dev_private;
+	struct drm_etnaviv_pm_signal *args = data;
+	struct etnaviv_gpu *gpu;
+
+	if (args->pipe >= ETNA_MAX_PIPES)
+		return -EINVAL;
+
+	gpu = priv->gpu[args->pipe];
+	if (!gpu)
+		return -ENXIO;
+
+	return etnaviv_pm_query_sig(gpu, args);
+}
+
 static const struct drm_ioctl_desc etnaviv_ioctls[] = {
 #define ETNA_IOCTL(n, func, flags) \
 	DRM_IOCTL_DEF_DRV(ETNAVIV_##n, etnaviv_ioctl_##func, flags)
@@ -463,6 +498,8 @@ static const struct drm_ioctl_desc etnaviv_ioctls[] = {
 	ETNA_IOCTL(WAIT_FENCE,   wait_fence,   DRM_AUTH|DRM_RENDER_ALLOW),
 	ETNA_IOCTL(GEM_USERPTR,  gem_userptr,  DRM_AUTH|DRM_RENDER_ALLOW),
 	ETNA_IOCTL(GEM_WAIT,     gem_wait,     DRM_AUTH|DRM_RENDER_ALLOW),
+	ETNA_IOCTL(PM_QUERY_DOM, pm_query_dom, DRM_AUTH|DRM_RENDER_ALLOW),
+	ETNA_IOCTL(PM_QUERY_SIG, pm_query_sig, DRM_AUTH|DRM_RENDER_ALLOW),
 };
 
 static const struct vm_operations_struct vm_ops = {
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
new file mode 100644
index 000000000000..08ef01c2a0ef
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2017 Etnaviv Project
+ * Copyright (C) 2017 Zodiac Inflight Innovations
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "etnaviv_gpu.h"
+
+struct etnaviv_pm_domain;
+
+struct etnaviv_pm_signal {
+	char name[64];
+	u32 data;
+
+	u32 (*sample)(struct etnaviv_gpu *gpu,
+	              const struct etnaviv_pm_domain *domain,
+	              const struct etnaviv_pm_signal *signal);
+};
+
+struct etnaviv_pm_domain {
+	char name[64];
+	u8 nr_signals;
+	const struct etnaviv_pm_signal *signal;
+};
+
+struct etnaviv_pm_domain_meta {
+	const struct etnaviv_pm_domain *domains;
+	u32 nr_domains;
+};
+
+static const struct etnaviv_pm_domain doms_3d[] = {
+};
+
+static const struct etnaviv_pm_domain doms_2d[] = {
+};
+
+static const struct etnaviv_pm_domain doms_vg[] = {
+};
+
+static const struct etnaviv_pm_domain_meta doms_meta[] = {
+	{
+		.nr_domains = ARRAY_SIZE(doms_3d),
+		.domains = &doms_3d[0]
+	},
+	{
+		.nr_domains = ARRAY_SIZE(doms_2d),
+		.domains = &doms_2d[0]
+	},
+	{
+		.nr_domains = ARRAY_SIZE(doms_vg),
+		.domains = &doms_vg[0]
+	}
+};
+
+int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,
+	struct drm_etnaviv_pm_domain *domain)
+{
+	const struct etnaviv_pm_domain_meta *meta = &doms_meta[domain->pipe];
+	const struct etnaviv_pm_domain *dom;
+
+	if (domain->iter >= meta->nr_domains)
+		return -EINVAL;
+
+	dom = meta->domains + domain->iter;
+
+	domain->id = domain->iter;
+	domain->nr_signals = dom->nr_signals;
+	strncpy(domain->name, dom->name, sizeof(domain->name));
+
+	domain->iter++;
+	if (domain->iter == meta->nr_domains)
+		domain->iter = 0xff;
+
+	return 0;
+}
+
+int etnaviv_pm_query_sig(struct etnaviv_gpu *gpu,
+	struct drm_etnaviv_pm_signal *signal)
+{
+	const struct etnaviv_pm_domain_meta *meta = &doms_meta[signal->pipe];
+	const struct etnaviv_pm_domain *dom;
+	const struct etnaviv_pm_signal *sig;
+
+	if (signal->domain >= meta->nr_domains)
+		return -EINVAL;
+
+	dom = meta->domains + signal->domain;
+
+	if (signal->iter > dom->nr_signals)
+		return -EINVAL;
+
+	sig = &dom->signal[signal->iter];
+
+	signal->id = signal->iter;
+	strncpy(signal->name, sig->name, sizeof(signal->name));
+
+	signal->iter++;
+	if (signal->iter == dom->nr_signals)
+		signal->iter = 0xffff;
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h
new file mode 100644
index 000000000000..4589cadc3a4f
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_perfmon.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2017 Etnaviv Project
+ * Copyright (C) 2017 Zodiac Inflight Innovations
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ETNAVIV_PERFMON_H__
+#define __ETNAVIV_PERFMON_H__
+
+struct etnaviv_gpu;
+struct drm_etnaviv_pm_domain;
+struct drm_etnaviv_pm_signal;
+
+int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,
+	struct drm_etnaviv_pm_domain *domain);
+
+int etnaviv_pm_query_sig(struct etnaviv_gpu *gpu,
+	struct drm_etnaviv_pm_signal *signal);
+
+#endif /* __ETNAVIV_PERFMON_H__ */