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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2021, Intel Corporation.
*
* Sohil Mehta <[email protected]>
*/
#define pr_fmt(fmt) "uintr: " fmt
#include <linux/anon_inodes.h>
#include <linux/fdtable.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <asm/uintr.h>
struct uintrfd_ctx {
struct uintr_receiver_info *r_info;
/* Protect sender_list */
spinlock_t sender_lock;
struct list_head sender_list;
};
#ifdef CONFIG_PROC_FS
static void uintrfd_show_fdinfo(struct seq_file *m, struct file *file)
{
struct uintrfd_ctx *uintrfd_ctx = file->private_data;
/* Check: Should we print the receiver and sender info here? */
seq_printf(m, "user_vector:%llu\n", uintrfd_ctx->r_info->uvec);
}
#endif
static int uintrfd_release(struct inode *inode, struct file *file)
{
struct uintrfd_ctx *uintrfd_ctx = file->private_data;
struct uintr_sender_info *s_info, *tmp;
unsigned long flags;
pr_debug("recv: Release uintrfd for r_task %d uvec %llu\n",
uintrfd_ctx->r_info->upid_ctx->task->pid,
uintrfd_ctx->r_info->uvec);
spin_lock_irqsave(&uintrfd_ctx->sender_lock, flags);
list_for_each_entry_safe(s_info, tmp, &uintrfd_ctx->sender_list, node) {
list_del(&s_info->node);
do_uintr_unregister_sender(uintrfd_ctx->r_info, s_info);
}
spin_unlock_irqrestore(&uintrfd_ctx->sender_lock, flags);
do_uintr_unregister_vector(uintrfd_ctx->r_info);
kfree(uintrfd_ctx);
return 0;
}
static const struct file_operations uintrfd_fops = {
#ifdef CONFIG_PROC_FS
.show_fdinfo = uintrfd_show_fdinfo,
#endif
.release = uintrfd_release,
.llseek = noop_llseek,
};
/*
* sys_uintr_create_fd - Create a uintr_fd for the registered interrupt vector.
*/
SYSCALL_DEFINE2(uintr_create_fd, u64, vector, unsigned int, flags)
{
struct uintrfd_ctx *uintrfd_ctx;
int uintrfd;
int ret;
if (!uintr_arch_enabled())
return -EOPNOTSUPP;
if (flags)
return -EINVAL;
uintrfd_ctx = kzalloc(sizeof(*uintrfd_ctx), GFP_KERNEL);
if (!uintrfd_ctx)
return -ENOMEM;
uintrfd_ctx->r_info = kzalloc(sizeof(*uintrfd_ctx->r_info), GFP_KERNEL);
if (!uintrfd_ctx->r_info) {
ret = -ENOMEM;
goto out_free_ctx;
}
uintrfd_ctx->r_info->uvec = vector;
ret = do_uintr_register_vector(uintrfd_ctx->r_info);
if (ret) {
kfree(uintrfd_ctx->r_info);
goto out_free_ctx;
}
INIT_LIST_HEAD(&uintrfd_ctx->sender_list);
spin_lock_init(&uintrfd_ctx->sender_lock);
/* TODO: Get user input for flags - UFD_CLOEXEC */
/* Check: Do we need O_NONBLOCK? */
uintrfd = anon_inode_getfd("[uintrfd]", &uintrfd_fops, uintrfd_ctx,
O_RDONLY | O_CLOEXEC | O_NONBLOCK);
if (uintrfd < 0) {
ret = uintrfd;
goto out_free_uvec;
}
pr_debug("recv: Alloc vector success uintrfd %d uvec %llu for task=%d\n",
uintrfd, uintrfd_ctx->r_info->uvec, current->pid);
return uintrfd;
out_free_uvec:
do_uintr_unregister_vector(uintrfd_ctx->r_info);
out_free_ctx:
kfree(uintrfd_ctx);
pr_debug("recv: Alloc vector failed for task=%d ret %d\n",
current->pid, ret);
return ret;
}
/*
* sys_uintr_register_handler - setup user interrupt handler for receiver.
*/
SYSCALL_DEFINE2(uintr_register_handler, u64 __user *, handler, unsigned int, flags)
{
int ret;
if (!uintr_arch_enabled())
return -EOPNOTSUPP;
if (flags)
return -EINVAL;
/* TODO: Validate the handler address */
if (!handler)
return -EFAULT;
ret = do_uintr_register_handler((u64)handler);
pr_debug("recv: register handler task=%d flags %d handler %lx ret %d\n",
current->pid, flags, (unsigned long)handler, ret);
return ret;
}
/*
* sys_uintr_unregister_handler - Teardown user interrupt handler for receiver.
*/
SYSCALL_DEFINE1(uintr_unregister_handler, unsigned int, flags)
{
int ret;
if (!uintr_arch_enabled())
return -EOPNOTSUPP;
if (flags)
return -EINVAL;
ret = do_uintr_unregister_handler();
pr_debug("recv: unregister handler task=%d flags %d ret %d\n",
current->pid, flags, ret);
return ret;
}
/*
* sys_uintr_register_sender - setup user inter-processor interrupt sender.
*/
SYSCALL_DEFINE2(uintr_register_sender, int, uintrfd, unsigned int, flags)
{
struct uintr_sender_info *s_info;
struct uintrfd_ctx *uintrfd_ctx;
unsigned long lock_flags;
struct file *uintr_f;
struct fd f;
int ret = 0;
if (!uintr_arch_enabled())
return -EOPNOTSUPP;
if (flags)
return -EINVAL;
f = fdget(uintrfd);
uintr_f = f.file;
if (!uintr_f)
return -EBADF;
if (uintr_f->f_op != &uintrfd_fops) {
ret = -EOPNOTSUPP;
goto out_fdput;
}
uintrfd_ctx = (struct uintrfd_ctx *)uintr_f->private_data;
spin_lock_irqsave(&uintrfd_ctx->sender_lock, lock_flags);
list_for_each_entry(s_info, &uintrfd_ctx->sender_list, node) {
if (s_info->task == current) {
ret = -EISCONN;
break;
}
}
spin_unlock_irqrestore(&uintrfd_ctx->sender_lock, lock_flags);
if (ret)
goto out_fdput;
s_info = kzalloc(sizeof(*s_info), GFP_KERNEL);
if (!s_info) {
ret = -ENOMEM;
goto out_fdput;
}
ret = do_uintr_register_sender(uintrfd_ctx->r_info, s_info);
if (ret) {
kfree(s_info);
goto out_fdput;
}
spin_lock_irqsave(&uintrfd_ctx->sender_lock, lock_flags);
list_add(&s_info->node, &uintrfd_ctx->sender_list);
spin_unlock_irqrestore(&uintrfd_ctx->sender_lock, lock_flags);
ret = s_info->uitt_index;
out_fdput:
pr_debug("send: register sender task=%d flags %d ret(uipi_id)=%d\n",
current->pid, flags, ret);
fdput(f);
return ret;
}
/*
* sys_uintr_unregister_sender - Unregister user inter-processor interrupt sender.
*/
SYSCALL_DEFINE2(uintr_unregister_sender, int, uintrfd, unsigned int, flags)
{
struct uintr_sender_info *s_info;
struct uintrfd_ctx *uintrfd_ctx;
struct file *uintr_f;
unsigned long lock_flags;
struct fd f;
int ret;
if (!uintr_arch_enabled())
return -EOPNOTSUPP;
if (flags)
return -EINVAL;
f = fdget(uintrfd);
uintr_f = f.file;
if (!uintr_f)
return -EBADF;
if (uintr_f->f_op != &uintrfd_fops) {
ret = -EOPNOTSUPP;
goto out_fdput;
}
uintrfd_ctx = (struct uintrfd_ctx *)uintr_f->private_data;
ret = -EINVAL;
spin_lock_irqsave(&uintrfd_ctx->sender_lock, lock_flags);
list_for_each_entry(s_info, &uintrfd_ctx->sender_list, node) {
if (s_info->task == current) {
ret = 0;
list_del(&s_info->node);
do_uintr_unregister_sender(uintrfd_ctx->r_info, s_info);
break;
}
}
spin_unlock_irqrestore(&uintrfd_ctx->sender_lock, lock_flags);
pr_debug("send: unregister sender uintrfd %d for task=%d ret %d\n",
uintrfd, current->pid, ret);
out_fdput:
fdput(f);
return ret;
}
/*
* sys_uintr_wait - Wait for a user interrupt
*/
SYSCALL_DEFINE1(uintr_wait, unsigned int, flags)
{
if (!uintr_arch_enabled())
return -EOPNOTSUPP;
if (flags)
return -EINVAL;
/* TODO: Add a timeout option */
return uintr_receiver_wait();
}
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