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drm/xe/perf/uapi: Add perf_stream_paranoid sysctl

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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: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618014609.3233427-3-ashutosh.dixit@intel.com
This commit is contained in:
Ashutosh Dixit 2024-06-17 18:45:54 -07:00
parent 52c2e956dc
commit fe8929bdf8
3 changed files with 51 additions and 0 deletions
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5
drivers/gpu/drm/xe/xe_module.c
View File

@ -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)

40
drivers/gpu/drm/xe/xe_perf.c
View File

@ -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);
}

6
drivers/gpu/drm/xe/xe_perf.h
View File

@ -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