Commit fe8929bd authored by Ashutosh Dixit's avatar Ashutosh Dixit
Browse files

drm/xe/perf/uapi: Add perf_stream_paranoid sysctl 



Normally only superuser/root can access perf counter data. However,
superuser can set perf_stream_paranoid sysctl to 0 to allow non-privileged
users to also access perf data. perf_stream_paranoid is introduced at the
perf layer to allow different perf stream types to share this access
mechanism.

v2: Add kernel doc for non-static functions (Michal)

Acked-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: default avatarJosé Roberto de Souza <jose.souza@intel.com>
Reviewed-by: default avatarUmesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: default avatarAshutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618014609.3233427-3-ashutosh.dixit@intel.com
parent 52c2e956

drivers/gpu/drm/xe/xe_module.c

+5 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 
#include "xe_drv.h"

#include "xe_hw_fence.h"

#include "xe_pci.h"

#include "xe_perf.h"

#include "xe_sched_job.h"



struct xe_modparam xe_modparam = {
@@ -78,6 +79,10 @@ static const struct init_funcs init_funcs[] = { 
		.init = xe_register_pci_driver,

		.exit = xe_unregister_pci_driver,

	},

	{

		.init = xe_perf_sysctl_register,

		.exit = xe_perf_sysctl_unregister,

	},

};



static int __init xe_init(void)

drivers/gpu/drm/xe/xe_perf.c

+40 −0
Original line number Diff line number Diff line
@@ -4,11 +4,15 @@ 
 */



#include <linux/errno.h>

#include <linux/sysctl.h>



#include <drm/xe_drm.h>



#include "xe_perf.h"



u32 xe_perf_stream_paranoid = true;

static struct ctl_table_header *sysctl_header;



/**

 * xe_perf_ioctl - The top level perf layer ioctl

 * @dev: @drm_device
@@ -32,3 +36,39 @@ int xe_perf_ioctl(struct drm_device *dev, void *data, struct drm_file *file) 
		return -EINVAL;

	}

}



static struct ctl_table perf_ctl_table[] = {

	{

	 .procname = "perf_stream_paranoid",

	 .data = &xe_perf_stream_paranoid,

	 .maxlen = sizeof(xe_perf_stream_paranoid),

	 .mode = 0644,

	 .proc_handler = proc_dointvec_minmax,

	 .extra1 = SYSCTL_ZERO,

	 .extra2 = SYSCTL_ONE,

	 },

	{}

};



/**

 * xe_perf_sysctl_register - Register "perf_stream_paranoid" sysctl

 *

 * Normally only superuser/root can access perf counter data. However,

 * superuser can set perf_stream_paranoid sysctl to 0 to allow non-privileged

 * users to also access perf data.

 *

 * Return: always returns 0

 */

int xe_perf_sysctl_register(void)

{

	sysctl_header = register_sysctl("dev/xe", perf_ctl_table);

	return 0;

}



/**

 * xe_perf_sysctl_unregister - Unregister "perf_stream_paranoid" sysctl

 */

void xe_perf_sysctl_unregister(void)

{

	unregister_sysctl_table(sysctl_header);

}

drivers/gpu/drm/xe/xe_perf.h

+6 −0
Original line number Diff line number Diff line
@@ -6,9 +6,15 @@ 
#ifndef _XE_PERF_H_

#define _XE_PERF_H_



#include <linux/types.h>



struct drm_device;

struct drm_file;



extern u32 xe_perf_stream_paranoid;



int xe_perf_ioctl(struct drm_device *dev, void *data, struct drm_file *file);

int xe_perf_sysctl_register(void);

void xe_perf_sysctl_unregister(void);



#endif