Commit 27ebf21f authored by Lijo Lazar's avatar Lijo Lazar Committed by Alex Deucher
Browse files

drm/amd/pm: Add debugfs node to read private buffer 



Add debugfs interface to read region allocated for FW private buffer

Signed-off-by: default avatarLijo Lazar <lijo.lazar@amd.com>
Suggested-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: default avatarHawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarKevin Wang <kevin1.wang@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent b8c78bdb

drivers/gpu/drm/amd/pm/amdgpu_pm.c

+44 −0
Original line number Diff line number Diff line
@@ -3534,6 +3534,45 @@ static int amdgpu_debugfs_pm_info_show(struct seq_file *m, void *unused) 


DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_pm_info);



/*

 * amdgpu_pm_priv_buffer_read - Read memory region allocated to FW

 *

 * Reads debug memory region allocated to PMFW

 */

static ssize_t amdgpu_pm_prv_buffer_read(struct file *f, char __user *buf,

					 size_t size, loff_t *pos)

{

	struct amdgpu_device *adev = file_inode(f)->i_private;

	const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;

	void *pp_handle = adev->powerplay.pp_handle;

	size_t smu_prv_buf_size;

	void *smu_prv_buf;



	if (amdgpu_in_reset(adev))

		return -EPERM;

	if (adev->in_suspend && !adev->in_runpm)

		return -EPERM;



	if (pp_funcs && pp_funcs->get_smu_prv_buf_details)

		pp_funcs->get_smu_prv_buf_details(pp_handle, &smu_prv_buf,

						  &smu_prv_buf_size);

	else

		return -ENOSYS;



	if (!smu_prv_buf || !smu_prv_buf_size)

		return -EINVAL;



	return simple_read_from_buffer(buf, size, pos, smu_prv_buf,

				       smu_prv_buf_size);

}



static const struct file_operations amdgpu_debugfs_pm_prv_buffer_fops = {

	.owner = THIS_MODULE,

	.open = simple_open,

	.read = amdgpu_pm_prv_buffer_read,

	.llseek = default_llseek,

};



#endif



void amdgpu_debugfs_pm_init(struct amdgpu_device *adev)
@@ -3545,5 +3584,10 @@ void amdgpu_debugfs_pm_init(struct amdgpu_device *adev) 
	debugfs_create_file("amdgpu_pm_info", 0444, root, adev,

			    &amdgpu_debugfs_pm_info_fops);



	if (adev->pm.smu_prv_buffer_size > 0)

		debugfs_create_file_size("amdgpu_pm_prv_buffer", 0444, root,

					 adev,

					 &amdgpu_debugfs_pm_prv_buffer_fops,

					 adev->pm.smu_prv_buffer_size);

#endif

}