drm/v3d: Move perfmon init completely into own unit

Now that the build time dependencies on various array sizes have been
removed, we can move the perfmon init completely into its own compilation
unit and remove the hardcoded defines.

This improves on the temporary fix quickly delivered in commit
9c3951ec ("drm/v3d: Fix perfmon build error/warning").
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
References: 9c3951ec ("drm/v3d: Fix perfmon build error/warning")
Reviewed-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240711135340.84617-10-tursulin@igalia.com

drivers/gpu/drm/v3d/v3d_drv.c

@@ -95,7 +95,7 @@ static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
 		args->value = 1;
 		return 0;
 	case DRM_V3D_PARAM_MAX_PERF_COUNTERS:
-		args->value = v3d->max_counters;
+		args->value = v3d->perfmon_info.max_counters;
 		return 0;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", args->param);
@@ -298,12 +298,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
 	v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 	WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 
-	if (v3d->ver >= 71)
-		v3d->max_counters = V3D_V71_NUM_PERFCOUNTERS;
-	else if (v3d->ver >= 42)
-		v3d->max_counters = V3D_V42_NUM_PERFCOUNTERS;
-	else
-		v3d->max_counters = 0;
+	v3d_perfmon_init(v3d);
 
 	v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
 	if (IS_ERR(v3d->reset)) {

drivers/gpu/drm/v3d/v3d_drv.h

@@ -104,10 +104,7 @@ struct v3d_dev {
 	int ver;
 	bool single_irq_line;
 
-	/* Different revisions of V3D have different total number of performance
-	 * counters
-	 */
-	unsigned int max_counters;
+	struct v3d_perfmon_info perfmon_info;
 
 	void __iomem *hub_regs;
 	void __iomem *core_regs[3];
@@ -568,6 +565,7 @@ int v3d_sched_init(struct v3d_dev *v3d);
 void v3d_sched_fini(struct v3d_dev *v3d);
 
 /* v3d_perfmon.c */
+void v3d_perfmon_init(struct v3d_dev *v3d);
 void v3d_perfmon_get(struct v3d_perfmon *perfmon);
 void v3d_perfmon_put(struct v3d_perfmon *perfmon);
 void v3d_perfmon_start(struct v3d_dev *v3d, struct v3d_perfmon *perfmon);

drivers/gpu/drm/v3d/v3d_perfmon.c

@@ -195,6 +195,23 @@ static const struct v3d_perf_counter_desc v3d_v71_performance_counters[] = {
 	{"QPU", "QPU-stalls-other", "[QPU] Stalled qcycles waiting for any other reason (vary/W/Z)"},
 };
 
+void v3d_perfmon_init(struct v3d_dev *v3d)
+{
+	const struct v3d_perf_counter_desc *counters = NULL;
+	unsigned int max = 0;
+
+	if (v3d->ver >= 71) {
+		counters = v3d_v71_performance_counters;
+		max = ARRAY_SIZE(v3d_v71_performance_counters);
+	} else if (v3d->ver >= 42) {
+		counters = v3d_v42_performance_counters;
+		max = ARRAY_SIZE(v3d_v42_performance_counters);
+	}
+
+	v3d->perfmon_info.max_counters = max;
+	v3d->perfmon_info.counters = counters;
+}
+
 void v3d_perfmon_get(struct v3d_perfmon *perfmon)
 {
 	if (perfmon)
@@ -321,7 +338,7 @@ int v3d_perfmon_create_ioctl(struct drm_device *dev, void *data,
 
 	/* Make sure all counters are valid. */
 	for (i = 0; i < req->ncounters; i++) {
-		if (req->counters[i] >= v3d->max_counters)
+		if (req->counters[i] >= v3d->perfmon_info.max_counters)
 			return -EINVAL;
 	}
 
@@ -416,25 +433,14 @@ int v3d_perfmon_get_counter_ioctl(struct drm_device *dev, void *data,
 			return -EINVAL;
 	}
 
+	if (!v3d->perfmon_info.max_counters)
+		return -EOPNOTSUPP;
+
 	/* Make sure that the counter ID is valid */
-	if (req->counter >= v3d->max_counters)
+	if (req->counter >= v3d->perfmon_info.max_counters)
 		return -EINVAL;
 
-	BUILD_BUG_ON(ARRAY_SIZE(v3d_v42_performance_counters) !=
-		     V3D_V42_NUM_PERFCOUNTERS);
-	BUILD_BUG_ON(ARRAY_SIZE(v3d_v71_performance_counters) !=
-		     V3D_V71_NUM_PERFCOUNTERS);
-	BUILD_BUG_ON(V3D_MAX_COUNTERS < V3D_V42_NUM_PERFCOUNTERS);
-	BUILD_BUG_ON(V3D_MAX_COUNTERS < V3D_V71_NUM_PERFCOUNTERS);
-	BUILD_BUG_ON((V3D_MAX_COUNTERS != V3D_V42_NUM_PERFCOUNTERS) &&
-		     (V3D_MAX_COUNTERS != V3D_V71_NUM_PERFCOUNTERS));
-
-	if (v3d->ver >= 71)
-		counter = &v3d_v71_performance_counters[req->counter];
-	else if (v3d->ver >= 42)
-		counter = &v3d_v42_performance_counters[req->counter];
-	else
-		return -EOPNOTSUPP;
+	counter = &v3d->perfmon_info.counters[req->counter];
 
 	strscpy(req->name, counter->name, sizeof(req->name));
 	strscpy(req->category, counter->category, sizeof(req->category));

drivers/gpu/drm/v3d/v3d_performance_counters.h

@@ -19,11 +19,17 @@ struct v3d_perf_counter_desc {
 	char description[256];
 };
 
+struct v3d_perfmon_info {
+	/*
+	 * Different revisions of V3D have different total number of
+	 * performance counters.
+	 */
+	unsigned int max_counters;
 
-#define V3D_V42_NUM_PERFCOUNTERS (87)
-#define V3D_V71_NUM_PERFCOUNTERS (93)
-
-/* Maximum number of performance counters supported by any version of V3D */
-#define V3D_MAX_COUNTERS (93)
+	/*
+	 * Array of counters valid for the platform.
+	 */
+	const struct v3d_perf_counter_desc *counters;
+};
 
 #endif