int cxl_start_work(struct cxl_context *ctx,
struct cxl_ioctl_start_work *work)
{
int rc;
/* code taken from afu_ioctl_start_work */
if (!(work->flags & CXL_START_WORK_NUM_IRQS))
work->num_interrupts = ctx->afu->pp_irqs;
else if ((work->num_interrupts < ctx->afu->pp_irqs) ||
(work->num_interrupts > ctx->afu->irqs_max)) {
return -EINVAL;
}
rc = afu_register_irqs(ctx, work->num_interrupts);
if (rc)
return rc;
rc = cxl_start_context(ctx, work->work_element_descriptor, current);
if (rc < 0) {
afu_release_irqs(ctx, ctx);
return rc;
}
return 0;
}
static long afu_ioctl_start_work(struct cxl_context *ctx,
struct cxl_ioctl_start_work __user *uwork)
{
struct cxl_ioctl_start_work work;
u64 amr = 0;
int rc;
pr_devel("%s: pe: %i\n", __func__, ctx->pe);
/* Do this outside the status_mutex to avoid a circular dependency with
* the locking in cxl_mmap_fault() */
if (copy_from_user(&work, uwork,
sizeof(struct cxl_ioctl_start_work))) {
rc = -EFAULT;
goto out;
}
mutex_lock(&ctx->status_mutex);
if (ctx->status != OPENED) {
rc = -EIO;
goto out;
}
/*
* if any of the reserved fields are set or any of the unused
* flags are set it's invalid
*/
if (work.reserved1 || work.reserved2 || work.reserved3 ||
work.reserved4 || work.reserved5 || work.reserved6 ||
(work.flags & ~CXL_START_WORK_ALL)) {
rc = -EINVAL;
goto out;
}
if (!(work.flags & CXL_START_WORK_NUM_IRQS))
work.num_interrupts = ctx->afu->pp_irqs;
else if ((work.num_interrupts < ctx->afu->pp_irqs) ||
(work.num_interrupts > ctx->afu->irqs_max)) {
rc = -EINVAL;
goto out;
}
if ((rc = afu_register_irqs(ctx, work.num_interrupts)))
goto out;
if (work.flags & CXL_START_WORK_AMR)
amr = work.amr & mfspr(SPRN_UAMOR);
/*
* We grab the PID here and not in the file open to allow for the case
* where a process (master, some daemon, etc) has opened the chardev on
* behalf of another process, so the AFU's mm gets bound to the process
* that performs this ioctl and not the process that opened the file.
*/
ctx->pid = get_pid(get_task_pid(current, PIDTYPE_PID));
trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr);
if ((rc = cxl_attach_process(ctx, false, work.work_element_descriptor,
amr))) {
afu_release_irqs(ctx);
goto out;
}
ctx->status = STARTED;
rc = 0;
out:
mutex_unlock(&ctx->status_mutex);
return rc;
}
