drm/v3d: Different V3D versions can have different number of perfcnt

Currently, even though V3D 7.1 has 93 performance counters, it is not
possible to create counters bigger than 87, as
`v3d_perfmon_create_ioctl()` understands that counters bigger than 87
are invalid.

Therefore, create a device variable to expose the maximum
number of counters for a given V3D version and make
`v3d_perfmon_create_ioctl()` check this variable.

This commit fixes CTS failures in the performance queries tests
`dEQP-VK.query_pool.performance_query.*` [1]

Link: https://gitlab.freedesktop.org/mesa/mesa/-/commit/ea1f09a5f21839f4f3b93610b58507c4bd9b9b81 [1]
Fixes: 6fd94871 ("drm/v3d: add brcm,2712-v3d as a compatible V3D device")
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240512222655.2792754-3-mcanal@igalia.com

drivers/gpu/drm/v3d/v3d_drv.c

@@ -294,6 +294,13 @@ 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 = ARRAY_SIZE(v3d_v71_performance_counters);
+	else if (v3d->ver >= 42)
+		v3d->max_counters = ARRAY_SIZE(v3d_v42_performance_counters);
+	else
+		v3d->max_counters = 0;
+
 	v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
 	if (IS_ERR(v3d->reset)) {
 		ret = PTR_ERR(v3d->reset);

drivers/gpu/drm/v3d/v3d_drv.h

@@ -104,6 +104,11 @@ struct v3d_dev {
 	int ver;
 	bool single_irq_line;
 
+	/* Different revisions of V3D have different total number of performance
+	 * counters
+	 */
+	unsigned int max_counters;
+
 	void __iomem *hub_regs;
 	void __iomem *core_regs[3];
 	void __iomem *bridge_regs;

drivers/gpu/drm/v3d/v3d_perfmon.c

@@ -123,6 +123,7 @@ int v3d_perfmon_create_ioctl(struct drm_device *dev, void *data,
 {
 	struct v3d_file_priv *v3d_priv = file_priv->driver_priv;
 	struct drm_v3d_perfmon_create *req = data;
+	struct v3d_dev *v3d = v3d_priv->v3d;
 	struct v3d_perfmon *perfmon;
 	unsigned int i;
 	int ret;
@@ -134,7 +135,7 @@ 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_PERFCNT_NUM)
+		if (req->counters[i] >= v3d->max_counters)
 			return -EINVAL;
 	}