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amdkfd: introduce new ioctl AMDKFD_IOC_CREATE_PROCESS

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This commit implemetns a new ioctl AMDKFD_IOC_CREATE_PROCESS
that creates a new secondary kfd_progress on the FD.

To keep backward compatibility, userspace programs need to invoke
this ioctl explicitly on a FD to create a secondary
kfd_process which replacing its primary kfd_process.

This commit bumps ioctl minor version.

Signed-off-by: Zhu Lingshan <lingshan.zhu@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Zhu Lingshan
2025-08-21 17:22:44 +08:00
committed by Alex Deucher
parent e3491fa3f3
commit cc6b66d661
4 changed files with 53 additions and 4 deletions
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45
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
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@@ -3150,6 +3150,48 @@ out:
return r;
}
/* userspace programs need to invoke this ioctl explicitly on a FD to
* create a secondary kfd_process which replacing its primary kfd_process
*/
static int kfd_ioctl_create_process(struct file *filep, struct kfd_process *p, void *data)
{
struct kfd_process *process;
int ret;
/* Each FD owns only one kfd_process */
if (p->context_id != KFD_CONTEXT_ID_PRIMARY)
return -EINVAL;
if (!filep->private_data || !p)
return -EINVAL;
mutex_lock(&kfd_processes_mutex);
if (p != filep->private_data) {
mutex_unlock(&kfd_processes_mutex);
return -EINVAL;
}
process = create_process(current, false);
if (IS_ERR(process)) {
mutex_unlock(&kfd_processes_mutex);
return PTR_ERR(process);
}
filep->private_data = process;
mutex_unlock(&kfd_processes_mutex);
ret = kfd_create_process_sysfs(process);
if (ret)
pr_warn("Failed to create sysfs entry for the kfd_process");
/* Each open() increases kref of the primary kfd_process,
* so we need to reduce it here when we create a new secondary process replacing it
*/
kfd_unref_process(p);
return 0;
}
#define AMDKFD_IOCTL_DEF(ioctl, _func, _flags) \
[_IOC_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, \
.cmd_drv = 0, .name = #ioctl}
@@ -3268,6 +3310,9 @@ static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
AMDKFD_IOCTL_DEF(AMDKFD_IOC_DBG_TRAP,
kfd_ioctl_set_debug_trap, 0),
AMDKFD_IOCTL_DEF(AMDKFD_IOC_CREATE_PROCESS,
kfd_ioctl_create_process, 0),
};
#define AMDKFD_CORE_IOCTL_COUNT ARRAY_SIZE(amdkfd_ioctls)