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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2016-2019 HabanaLabs, Ltd.
* All Rights Reserved.
*/
#include <uapi/misc/habanalabs.h>
#include "habanalabs.h"
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#define HL_IOCTL_DEF(ioctl, _func) \
[_IOC_NR(ioctl)] = {.cmd = ioctl, .func = _func}
static const struct hl_ioctl_desc hl_ioctls[] = {
HL_IOCTL_DEF(HL_IOCTL_CB, hl_cb_ioctl)
};
#define HL_CORE_IOCTL_COUNT ARRAY_SIZE(hl_ioctls)
long hl_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
struct hl_fpriv *hpriv = filep->private_data;
struct hl_device *hdev = hpriv->hdev;
hl_ioctl_t *func;
const struct hl_ioctl_desc *ioctl = NULL;
unsigned int nr = _IOC_NR(cmd);
char stack_kdata[128] = {0};
char *kdata = NULL;
unsigned int usize, asize;
int retcode;
if (hdev->hard_reset_pending) {
dev_crit_ratelimited(hdev->dev,
"Device HARD reset pending! Please close FD\n");
return -ENODEV;
}
if ((nr >= HL_COMMAND_START) && (nr < HL_COMMAND_END)) {
u32 hl_size;
ioctl = &hl_ioctls[nr];
hl_size = _IOC_SIZE(ioctl->cmd);
usize = asize = _IOC_SIZE(cmd);
if (hl_size > asize)
asize = hl_size;
cmd = ioctl->cmd;
} else {
dev_err(hdev->dev, "invalid ioctl: pid=%d, nr=0x%02x\n",
task_pid_nr(current), nr);
return -ENOTTY;
}
/* Do not trust userspace, use our own definition */
func = ioctl->func;
if (unlikely(!func)) {
dev_dbg(hdev->dev, "no function\n");
retcode = -ENOTTY;
goto out_err;
}
if (cmd & (IOC_IN | IOC_OUT)) {
if (asize <= sizeof(stack_kdata)) {
kdata = stack_kdata;
} else {
kdata = kzalloc(asize, GFP_KERNEL);
if (!kdata) {
retcode = -ENOMEM;
goto out_err;
}
}
}
if (cmd & IOC_IN) {
if (copy_from_user(kdata, (void __user *)arg, usize)) {
retcode = -EFAULT;
goto out_err;
}
} else if (cmd & IOC_OUT) {
memset(kdata, 0, usize);
}
retcode = func(hpriv, kdata);
if (cmd & IOC_OUT)
if (copy_to_user((void __user *)arg, kdata, usize))
retcode = -EFAULT;
out_err:
if (retcode)
dev_dbg(hdev->dev,
"error in ioctl: pid=%d, cmd=0x%02x, nr=0x%02x\n",
task_pid_nr(current), cmd, nr);
if (kdata != stack_kdata)
kfree(kdata);
return retcode;
}
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