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Tue, 13 Jan 2026 10:17:00 +0000 (GMT) Received: from 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa (172.25.4.58) by HHMAIL01.hh.imgtec.org (10.100.10.19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.29; Tue, 13 Jan 2026 10:16:59 +0000 From: Matt Coster Date: Tue, 13 Jan 2026 10:16:44 +0000 Subject: [PATCH 6/6] drm/imagination: Warn or error on unsupported hardware Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20260113-device-support-info-v1-6-91e5db7f7294@imgtec.com> References: <20260113-device-support-info-v1-0-91e5db7f7294@imgtec.com> In-Reply-To: <20260113-device-support-info-v1-0-91e5db7f7294@imgtec.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter CC: Frank Binns , Brajesh Gupta , Alessio Belle , Alexandru Dadu , Matt Coster , , X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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Signed-off-by: Matt Coster --- drivers/gpu/drm/imagination/pvr_device.c | 73 ++++++++++++++++++++++++++++= +++- 1 file changed, 72 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/imagination/pvr_device.c b/drivers/gpu/drm/ima= gination/pvr_device.c index d87557812409a..f58bb66a63275 100644 --- a/drivers/gpu/drm/imagination/pvr_device.c +++ b/drivers/gpu/drm/imagination/pvr_device.c @@ -525,6 +525,77 @@ pvr_gpuid_decode_string(const struct pvr_device *pvr_d= ev, } EXPORT_SYMBOL_IF_KUNIT(pvr_gpuid_decode_string); =20 +static bool pvr_exp_hw_support; +module_param_named(exp_hw_support, pvr_exp_hw_support, bool, 0600); +MODULE_PARM_DESC(exp_hw_support, "Bypass runtime checks for fully supporte= d GPU cores. WARNING: enabling this option may result in a buggy, insecure,= or otherwise unusable driver."); + +/** + * enum pvr_gpu_support_level - The level of support for a gpu_id in the c= urrent + * version of the driver. + * + * @PVR_GPU_UNKNOWN: Cores that are unknown to the driver. These may not e= ven exist. + * @PVR_GPU_EXPERIMENTAL: Cores that have experimental support. + * @PVR_GPU_SUPPORTED: Cores that are supported and maintained. + */ +enum pvr_gpu_support_level { + PVR_GPU_UNKNOWN, + PVR_GPU_EXPERIMENTAL, + PVR_GPU_SUPPORTED, +}; + +static enum pvr_gpu_support_level +pvr_gpu_support_level(const struct pvr_gpu_id *gpu_id) +{ + switch (pvr_gpu_id_to_packed_bvnc(gpu_id)) { + case PVR_PACKED_BVNC(33, 15, 11, 3): + case PVR_PACKED_BVNC(36, 53, 104, 796): + return PVR_GPU_SUPPORTED; + + case PVR_PACKED_BVNC(36, 52, 104, 182): + return PVR_GPU_EXPERIMENTAL; + + default: + return PVR_GPU_UNKNOWN; + } +} + +static int +pvr_check_gpu_supported(struct pvr_device *pvr_dev, + const struct pvr_gpu_id *gpu_id) +{ + struct drm_device *drm_dev =3D from_pvr_device(pvr_dev); + + switch (pvr_gpu_support_level(gpu_id)) { + case PVR_GPU_SUPPORTED: + if (pvr_exp_hw_support) + drm_info(drm_dev, "Module parameter 'exp_hw_support' was set, but this = hardware is fully supported by the current driver."); + + break; + + case PVR_GPU_EXPERIMENTAL: + if (!pvr_exp_hw_support) { + drm_err(drm_dev, "Unsupported GPU! Set 'exp_hw_support' to bypass this = check."); + return -ENODEV; + } + + drm_warn(drm_dev, "Running on unsupported hardware; you may encounter bu= gs!"); + break; + + /* NOTE: This code path may indicate misbehaving hardware. */ + case PVR_GPU_UNKNOWN: + default: + if (!pvr_exp_hw_support) { + drm_err(drm_dev, "Unknown GPU! Set 'exp_hw_support' to bypass this chec= k."); + return -ENODEV; + } + + drm_warn(drm_dev, "Running on unknown hardware; expect issues."); + break; + } + + return 0; +} + static char *pvr_gpuid_override; module_param_named(gpuid, pvr_gpuid_override, charp, 0400); MODULE_PARM_DESC(gpuid, "GPU ID (BVNC) to be used instead of the value rea= d from hardware."); @@ -555,7 +626,7 @@ pvr_load_gpu_id(struct pvr_device *pvr_dev) return err; } =20 - return 0; + return pvr_check_gpu_supported(pvr_dev, gpu_id); } =20 /** --=20 2.52.0