linux-kernel - [PATCH v4 7/7] drm/etnaviv: Warn when probing on NPUs

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Date:   Thu,  1 Dec 2022 10:21:28 +0100
From:   Tomeu Vizoso <tomeu.vizoso@...labora.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     italonicola@...labora.com,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        etnaviv@...ts.freedesktop.org (moderated list:DRM DRIVERS FOR VIVANTE
        GPU IP),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS FOR VIVANTE GPU
        IP), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v4 7/7] drm/etnaviv: Warn when probing on NPUs

Userspace is still not making full use of the hardware, so we don't know
yet if changes to the UAPI won't be needed. Warn about it.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index 37018bc55810..3cbc82bbf8d4 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -765,6 +765,10 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
 		goto fail;
 	}
 
+	if (gpu->identity.nn_core_count > 0)
+		dev_warn(gpu->dev, "etnaviv has been instantiated on a NPU, "
+                                   "for which the UAPI is still experimental\n");
+
 	/* Exclude VG cores with FE2.0 */
 	if (gpu->identity.features & chipFeatures_PIPE_VG &&
 	    gpu->identity.features & chipFeatures_FE20) {
-- 
2.38.1