[PATCH v2] drm/amdgpu: Add debugfs file for VBIOS and version

[Christian König]

Am 24.08.2017 um 16:10 schrieb Kent Russell:
> Add 2 debugfs files, one that contains the VBIOS version, and one that
> contains the VBIOS itself. These won't change after initialization,
> so we can add the VBIOS version when we parse the atombios information.
>
> This ensures that we can find out the VBIOS version, even when the dmesg
> buffer fills up, and makes it easier to associate which VBIOS version is
> for which GPU on mGPU configurations. Set the size to 20 characters in
> case of some weird VBIOS version that exceeds the expected 17 character
> format (3-8-3\0). The VBIOS dump also allows for easy debugging
>
>      v2: Move to debugfs, clarify commit message, add VBIOS dump file
>
> Signed-off-by: Kent Russell <kent.russell at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 62 ++++++++++++++++++++++++++++++
>   drivers/gpu/drm/amd/amdgpu/atom.c          |  5 ++-
>   drivers/gpu/drm/amd/amdgpu/atom.h          |  1 +
>   3 files changed, 67 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index eb1315a..c041496 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -66,6 +66,8 @@ MODULE_FIRMWARE("amdgpu/raven_gpu_info.bin");
>   static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev);
>   static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev);
>   static int amdgpu_debugfs_test_ib_ring_init(struct amdgpu_device *adev);
> +static int amdgpu_debugfs_vbios_dump_init(struct amdgpu_device *adev);
> +static int amdgpu_debugfs_vbios_version_init(struct amdgpu_device *adev);
>   
>   static const char *amdgpu_asic_name[] = {
>   	"TAHITI",
> @@ -2250,6 +2252,14 @@ int amdgpu_device_init(struct amdgpu_device *adev,
>   	if (r)
>   		DRM_ERROR("registering firmware debugfs failed (%d).\n", r);
>   
> +	r = amdgpu_debugfs_vbios_dump_init(adev);
> +	if (r)
> +		DRM_ERROR("Creating vbios dump debugfs failed (%d).\n", r);
> +
> +	r = amdgpu_debugfs_vbios_version_init(adev);
> +	if (r)
> +		DRM_ERROR("Creating vbios version debugfs failed (%d).\n", r);
> +
>   	if ((amdgpu_testing & 1)) {
>   		if (adev->accel_working)
>   			amdgpu_test_moves(adev);
> @@ -3830,6 +3840,50 @@ int amdgpu_debugfs_init(struct drm_minor *minor)
>   {
>   	return 0;
>   }
> +
> +static int amdgpu_debugfs_get_vbios_dump(struct seq_file *m, void *data)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *) m->private;
> +	struct drm_device *dev = node->minor->dev;
> +	struct amdgpu_device *adev = dev->dev_private;
> +
> +	seq_write(m, adev->bios, adev->bios_size);
> +	return 0;
> +}
> +
> +static int amdgpu_debugfs_get_vbios_version(struct seq_file *m, void *data)
> +{
> +	struct drm_info_node *node = (struct drm_info_node *) m->private;
> +	struct drm_device *dev = node->minor->dev;
> +	struct amdgpu_device *adev = dev->dev_private;
> +	struct atom_context *ctx = adev->mode_info.atom_context;
> +
> +	seq_printf(m, "%s\n", ctx->vbios_version);
> +	return 0;
> +}
> +
> +static const struct drm_info_list amdgpu_vbios_dump_list[] = {
> +		{"amdgpu_vbios",
> +		 amdgpu_debugfs_get_vbios_dump,
> +		 0, NULL},
> +};
> +
> +static const struct drm_info_list amdgpu_vbios_version_list[] = {
> +		{"amdgpu_vbios_version",
> +		 amdgpu_debugfs_get_vbios_version,
> +		 0, NULL},
> +};
> +
> +static int amdgpu_debugfs_vbios_dump_init(struct amdgpu_device *adev)
> +{
> +	return amdgpu_debugfs_add_files(adev,
> +					amdgpu_vbios_dump_list, 1);
> +}
> +static int amdgpu_debugfs_vbios_version_init(struct amdgpu_device *adev)
> +{
> +	return amdgpu_debugfs_add_files(adev,
> +					amdgpu_vbios_version_list, 1);
> +}

Is there any point in having all those different functions and arrays 
just for debugfs init?

We should probably just have one of them in amdgpu_device.c.

But that is a different topic, this patch is Reviewed-by: Christian 
König <christian.koenig at amd.com> anyway.

Regards,
Christian.

>   #else
>   static int amdgpu_debugfs_test_ib_ring_init(struct amdgpu_device *adev)
>   {
> @@ -3839,5 +3893,13 @@ static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
>   {
>   	return 0;
>   }
> +static int amdgpu_debugfs_vbios_dump_init(struct amdgpu_device *adev)
> +{
> +	return 0;
> +}
> +static int amdgpu_debugfs_vbios_version_init(struct amdgpu_device *adev)
> +{
> +	return 0;
> +}
>   static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev) { }
>   #endif
> diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c b/drivers/gpu/drm/amd/amdgpu/atom.c
> index d69aa2e..69500a8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/atom.c
> +++ b/drivers/gpu/drm/amd/amdgpu/atom.c
> @@ -1343,8 +1343,11 @@ struct atom_context *amdgpu_atom_parse(struct card_info *card, void *bios)
>   		idx = 0x80;
>   
>   	str = CSTR(idx);
> -	if (*str != '\0')
> +	if (*str != '\0') {
>   		pr_info("ATOM BIOS: %s\n", str);
> +		strlcpy(ctx->vbios_version, str, sizeof(ctx->vbios_version));
> +	}
> +
>   
>   	return ctx;
>   }
> diff --git a/drivers/gpu/drm/amd/amdgpu/atom.h b/drivers/gpu/drm/amd/amdgpu/atom.h
> index ddd8045..a391709 100644
> --- a/drivers/gpu/drm/amd/amdgpu/atom.h
> +++ b/drivers/gpu/drm/amd/amdgpu/atom.h
> @@ -140,6 +140,7 @@ struct atom_context {
>   	int io_mode;
>   	uint32_t *scratch;
>   	int scratch_size_bytes;
> +	char vbios_version[20];
>   };
>   
>   extern int amdgpu_atom_debug;