Commit 719b378d authored by Sunil Khatri's avatar Sunil Khatri Committed by Christian König
Browse files

drm/amdgpu: add debugfs support for VM pagetable per client 



Add a debugfs file under the client directory which shares
the root page table base address of the VM.

This address could be used to dump the pagetable for debug
memory issues.

Signed-off-by: default avatarSunil Khatri <sunil.khatri@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20250704075548.1549849-4-sunil.khatri@amd.com


Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
parent 1fd45bc2

drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

+52 −0
Original line number Diff line number Diff line
@@ -2131,6 +2131,55 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev) 
	return 0;

}



static int amdgpu_pt_info_read(struct seq_file *m, void *unused)

{

	struct drm_file *file;

	struct amdgpu_fpriv *fpriv;

	struct amdgpu_bo *root_bo;

	int r;



	file = m->private;

	if (!file)

		return -EINVAL;



	fpriv = file->driver_priv;

	if (!fpriv && !fpriv->vm.root.bo)

		return -ENODEV;



	root_bo = amdgpu_bo_ref(fpriv->vm.root.bo);

	r = amdgpu_bo_reserve(root_bo, true);

	if (r) {

		amdgpu_bo_unref(&root_bo);

		return -EINVAL;

	}



	seq_printf(m, "gpu_address: 0x%llx\n", amdgpu_bo_gpu_offset(fpriv->vm.root.bo));



	amdgpu_bo_unreserve(root_bo);

	amdgpu_bo_unref(&root_bo);



	return 0;

}



static int amdgpu_pt_info_open(struct inode *inode, struct file *file)

{

	return single_open(file, amdgpu_pt_info_read, inode->i_private);

}



static const struct file_operations amdgpu_pt_info_fops = {

	.owner = THIS_MODULE,

	.open = amdgpu_pt_info_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



void amdgpu_debugfs_vm_init(struct drm_file *file)

{

	debugfs_create_file("vm_pagetable_info", 0444, file->debugfs_client, file,

			    &amdgpu_pt_info_fops);

}



#else

int amdgpu_debugfs_init(struct amdgpu_device *adev)

{
@@ -2140,4 +2189,7 @@ int amdgpu_debugfs_regs_init(struct amdgpu_device *adev) 
{

	return 0;

}

void amdgpu_debugfs_vm_init(struct drm_file *file)

{

}

#endif

drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.h

+1 −0
Original line number Diff line number Diff line
@@ -33,4 +33,5 @@ void amdgpu_debugfs_fence_init(struct amdgpu_device *adev); 
void amdgpu_debugfs_firmware_init(struct amdgpu_device *adev);

void amdgpu_debugfs_gem_init(struct amdgpu_device *adev);

void amdgpu_debugfs_mes_event_log_init(struct amdgpu_device *adev);

void amdgpu_debugfs_vm_init(struct drm_file *file);

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

+2 −0
Original line number Diff line number Diff line
@@ -1395,6 +1395,8 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv) 
	if (r)

		goto error_pasid;



	amdgpu_debugfs_vm_init(file_priv);



	r = amdgpu_vm_init(adev, &fpriv->vm, fpriv->xcp_id);

	if (r)

		goto error_pasid;