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linux_dsm_epyc7002/drivers/misc/habanalabs/habanalabs_ioctl.c

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habanalabs: add command buffer module This patch adds the command buffer (CB) module, which allows the user to create and destroy CBs and to map them to the user's process address-space. A command buffer is a memory blocks that reside in DMA-able address-space and is physically contiguous so it can be accessed by the device without MMU translation. The command buffer memory is allocated using the coherent DMA API. When creating a new CB, the IOCTL returns a handle of it, and the user-space process needs to use that handle to mmap the buffer to get a VA in the user's address-space. Before destroying (freeing) a CB, the user must unmap the CB's VA using the CB handle. Each CB has a reference counter, which tracks its usage in command submissions and also its mmaps (only a single mmap is allowed). The driver maintains a pool of pre-allocated CBs in order to reduce latency during command submissions. In case the pool is empty, the driver will go to the slow-path of allocating a new CB, i.e. calling dma_alloc_coherent. Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-16 05:39:15 +07:00
// 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;
habanalabs: add device reset support This patch adds support for doing various on-the-fly reset of Goya. The driver supports two types of resets: 1. soft-reset 2. hard-reset Soft-reset is done when the device detects a timeout of a command submission that was given to the device. The soft-reset process only resets the engines that are relevant for the submission of compute jobs, i.e. the DMA channels, the TPCs and the MME. The purpose is to bring the device as fast as possible to a working state. Hard-reset is done in several cases: 1. After soft-reset is done but the device is not responding 2. When fatal errors occur inside the device, e.g. ECC error 3. When the driver is removed Hard-reset performs a reset of the entire chip except for the PCI controller and the PLLs. It is a much longer process then soft-reset but it helps to recover the device without the need to reboot the Host. After hard-reset, the driver will restore the max power attribute and in case of manual power management, the frequencies that were set. This patch also adds two entries to the sysfs, which allows the root user to initiate a soft or hard reset. Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-16 05:39:20 +07:00
if (hdev->hard_reset_pending) {
dev_crit_ratelimited(hdev->dev,
"Device HARD reset pending! Please close FD\n");
return -ENODEV;
}
habanalabs: add command buffer module This patch adds the command buffer (CB) module, which allows the user to create and destroy CBs and to map them to the user's process address-space. A command buffer is a memory blocks that reside in DMA-able address-space and is physically contiguous so it can be accessed by the device without MMU translation. The command buffer memory is allocated using the coherent DMA API. When creating a new CB, the IOCTL returns a handle of it, and the user-space process needs to use that handle to mmap the buffer to get a VA in the user's address-space. Before destroying (freeing) a CB, the user must unmap the CB's VA using the CB handle. Each CB has a reference counter, which tracks its usage in command submissions and also its mmaps (only a single mmap is allowed). The driver maintains a pool of pre-allocated CBs in order to reduce latency during command submissions. In case the pool is empty, the driver will go to the slow-path of allocating a new CB, i.e. calling dma_alloc_coherent. Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-02-16 05:39:15 +07:00
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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