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drm/imagination: Warn or error on unsupported hardware

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Gate the use of unsupported hardware behind a new module parameter
(exp_hw_support).

Reviewed-by: Alessio Belle <alessio.belle@imgtec.com>
Link: https://patch.msgid.link/20260113-device-support-info-v1-6-91e5db7f7294@imgtec.com
Signed-off-by: Matt Coster <matt.coster@imgtec.com>
This commit is contained in:
Matt Coster 2026-01-13 10:16:44 +00:00
parent 3519e9ea13
commit 1c21f240fb
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GPG Key ID: 79BC19F3D9DE6AB0
1 changed files with 72 additions and 1 deletions
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73
drivers/gpu/drm/imagination/pvr_device.c
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@ -525,6 +525,77 @@ pvr_gpuid_decode_string(const struct pvr_device *pvr_dev,
}
EXPORT_SYMBOL_IF_KUNIT(pvr_gpuid_decode_string);
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 supported 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 current
* version of the driver.
*
* @PVR_GPU_UNKNOWN: Cores that are unknown to the driver. These may not even 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 = 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 bugs!");
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 check.");
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 read from hardware.");
@ -555,7 +626,7 @@ pvr_load_gpu_id(struct pvr_device *pvr_dev)
return err;
}
return 0;
return pvr_check_gpu_supported(pvr_dev, gpu_id);
}
/**