mirror of https://gitee.com/openkylin/linux.git
546 lines
12 KiB
C
546 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/compat.h>
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#include <linux/dma-mapping.h>
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#include <linux/iommu.h>
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#include <linux/module.h>
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#include <linux/poll.h>
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#include <linux/uacce.h>
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static struct class *uacce_class;
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static dev_t uacce_devt;
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static DEFINE_MUTEX(uacce_mutex);
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static DEFINE_XARRAY_ALLOC(uacce_xa);
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static int uacce_start_queue(struct uacce_queue *q)
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{
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int ret = 0;
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mutex_lock(&uacce_mutex);
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if (q->state != UACCE_Q_INIT) {
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ret = -EINVAL;
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goto out_with_lock;
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}
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if (q->uacce->ops->start_queue) {
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ret = q->uacce->ops->start_queue(q);
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if (ret < 0)
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goto out_with_lock;
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}
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q->state = UACCE_Q_STARTED;
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out_with_lock:
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mutex_unlock(&uacce_mutex);
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return ret;
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}
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static int uacce_put_queue(struct uacce_queue *q)
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{
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struct uacce_device *uacce = q->uacce;
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mutex_lock(&uacce_mutex);
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if (q->state == UACCE_Q_ZOMBIE)
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goto out;
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if ((q->state == UACCE_Q_STARTED) && uacce->ops->stop_queue)
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uacce->ops->stop_queue(q);
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if ((q->state == UACCE_Q_INIT || q->state == UACCE_Q_STARTED) &&
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uacce->ops->put_queue)
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uacce->ops->put_queue(q);
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q->state = UACCE_Q_ZOMBIE;
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out:
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mutex_unlock(&uacce_mutex);
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return 0;
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}
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static long uacce_fops_unl_ioctl(struct file *filep,
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unsigned int cmd, unsigned long arg)
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{
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struct uacce_queue *q = filep->private_data;
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struct uacce_device *uacce = q->uacce;
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switch (cmd) {
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case UACCE_CMD_START_Q:
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return uacce_start_queue(q);
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case UACCE_CMD_PUT_Q:
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return uacce_put_queue(q);
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default:
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if (!uacce->ops->ioctl)
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return -EINVAL;
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return uacce->ops->ioctl(q, cmd, arg);
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}
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}
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#ifdef CONFIG_COMPAT
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static long uacce_fops_compat_ioctl(struct file *filep,
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unsigned int cmd, unsigned long arg)
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{
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arg = (unsigned long)compat_ptr(arg);
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return uacce_fops_unl_ioctl(filep, cmd, arg);
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}
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#endif
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static int uacce_bind_queue(struct uacce_device *uacce, struct uacce_queue *q)
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{
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int pasid;
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struct iommu_sva *handle;
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if (!(uacce->flags & UACCE_DEV_SVA))
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return 0;
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handle = iommu_sva_bind_device(uacce->parent, current->mm, NULL);
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if (IS_ERR(handle))
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return PTR_ERR(handle);
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pasid = iommu_sva_get_pasid(handle);
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if (pasid == IOMMU_PASID_INVALID) {
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iommu_sva_unbind_device(handle);
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return -ENODEV;
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}
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q->handle = handle;
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q->pasid = pasid;
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return 0;
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}
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static void uacce_unbind_queue(struct uacce_queue *q)
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{
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if (!q->handle)
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return;
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iommu_sva_unbind_device(q->handle);
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q->handle = NULL;
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}
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static int uacce_fops_open(struct inode *inode, struct file *filep)
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{
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struct uacce_device *uacce;
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struct uacce_queue *q;
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int ret = 0;
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uacce = xa_load(&uacce_xa, iminor(inode));
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if (!uacce)
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return -ENODEV;
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q = kzalloc(sizeof(struct uacce_queue), GFP_KERNEL);
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if (!q)
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return -ENOMEM;
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ret = uacce_bind_queue(uacce, q);
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if (ret)
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goto out_with_mem;
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q->uacce = uacce;
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if (uacce->ops->get_queue) {
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ret = uacce->ops->get_queue(uacce, q->pasid, q);
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if (ret < 0)
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goto out_with_bond;
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}
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init_waitqueue_head(&q->wait);
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filep->private_data = q;
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uacce->inode = inode;
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q->state = UACCE_Q_INIT;
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mutex_lock(&uacce->queues_lock);
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list_add(&q->list, &uacce->queues);
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mutex_unlock(&uacce->queues_lock);
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return 0;
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out_with_bond:
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uacce_unbind_queue(q);
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out_with_mem:
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kfree(q);
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return ret;
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}
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static int uacce_fops_release(struct inode *inode, struct file *filep)
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{
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struct uacce_queue *q = filep->private_data;
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mutex_lock(&q->uacce->queues_lock);
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list_del(&q->list);
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mutex_unlock(&q->uacce->queues_lock);
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uacce_put_queue(q);
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uacce_unbind_queue(q);
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kfree(q);
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return 0;
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}
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static vm_fault_t uacce_vma_fault(struct vm_fault *vmf)
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{
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if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
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return VM_FAULT_SIGBUS;
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return 0;
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}
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static void uacce_vma_close(struct vm_area_struct *vma)
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{
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struct uacce_queue *q = vma->vm_private_data;
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struct uacce_qfile_region *qfr = NULL;
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if (vma->vm_pgoff < UACCE_MAX_REGION)
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qfr = q->qfrs[vma->vm_pgoff];
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kfree(qfr);
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}
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static const struct vm_operations_struct uacce_vm_ops = {
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.fault = uacce_vma_fault,
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.close = uacce_vma_close,
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};
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static int uacce_fops_mmap(struct file *filep, struct vm_area_struct *vma)
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{
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struct uacce_queue *q = filep->private_data;
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struct uacce_device *uacce = q->uacce;
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struct uacce_qfile_region *qfr;
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enum uacce_qfrt type = UACCE_MAX_REGION;
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int ret = 0;
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if (vma->vm_pgoff < UACCE_MAX_REGION)
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type = vma->vm_pgoff;
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else
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return -EINVAL;
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qfr = kzalloc(sizeof(*qfr), GFP_KERNEL);
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if (!qfr)
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return -ENOMEM;
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vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_WIPEONFORK;
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vma->vm_ops = &uacce_vm_ops;
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vma->vm_private_data = q;
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qfr->type = type;
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mutex_lock(&uacce_mutex);
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if (q->state != UACCE_Q_INIT && q->state != UACCE_Q_STARTED) {
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ret = -EINVAL;
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goto out_with_lock;
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}
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if (q->qfrs[type]) {
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ret = -EEXIST;
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goto out_with_lock;
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}
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switch (type) {
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case UACCE_QFRT_MMIO:
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if (!uacce->ops->mmap) {
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ret = -EINVAL;
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goto out_with_lock;
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}
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ret = uacce->ops->mmap(q, vma, qfr);
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if (ret)
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goto out_with_lock;
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break;
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case UACCE_QFRT_DUS:
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if (!uacce->ops->mmap) {
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ret = -EINVAL;
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goto out_with_lock;
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}
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ret = uacce->ops->mmap(q, vma, qfr);
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if (ret)
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goto out_with_lock;
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break;
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default:
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ret = -EINVAL;
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goto out_with_lock;
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}
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q->qfrs[type] = qfr;
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mutex_unlock(&uacce_mutex);
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return ret;
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out_with_lock:
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mutex_unlock(&uacce_mutex);
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kfree(qfr);
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return ret;
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}
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static __poll_t uacce_fops_poll(struct file *file, poll_table *wait)
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{
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struct uacce_queue *q = file->private_data;
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struct uacce_device *uacce = q->uacce;
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poll_wait(file, &q->wait, wait);
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if (uacce->ops->is_q_updated && uacce->ops->is_q_updated(q))
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return EPOLLIN | EPOLLRDNORM;
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return 0;
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}
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static const struct file_operations uacce_fops = {
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.owner = THIS_MODULE,
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.open = uacce_fops_open,
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.release = uacce_fops_release,
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.unlocked_ioctl = uacce_fops_unl_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = uacce_fops_compat_ioctl,
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#endif
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.mmap = uacce_fops_mmap,
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.poll = uacce_fops_poll,
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};
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#define to_uacce_device(dev) container_of(dev, struct uacce_device, dev)
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static ssize_t api_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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return sprintf(buf, "%s\n", uacce->api_ver);
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}
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static ssize_t flags_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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return sprintf(buf, "%u\n", uacce->flags);
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}
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static ssize_t available_instances_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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if (!uacce->ops->get_available_instances)
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return -ENODEV;
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return sprintf(buf, "%d\n",
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uacce->ops->get_available_instances(uacce));
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}
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static ssize_t algorithms_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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return sprintf(buf, "%s\n", uacce->algs);
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}
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static ssize_t region_mmio_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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return sprintf(buf, "%lu\n",
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uacce->qf_pg_num[UACCE_QFRT_MMIO] << PAGE_SHIFT);
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}
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static ssize_t region_dus_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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return sprintf(buf, "%lu\n",
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uacce->qf_pg_num[UACCE_QFRT_DUS] << PAGE_SHIFT);
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}
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static DEVICE_ATTR_RO(api);
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static DEVICE_ATTR_RO(flags);
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static DEVICE_ATTR_RO(available_instances);
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static DEVICE_ATTR_RO(algorithms);
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static DEVICE_ATTR_RO(region_mmio_size);
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static DEVICE_ATTR_RO(region_dus_size);
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static struct attribute *uacce_dev_attrs[] = {
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&dev_attr_api.attr,
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&dev_attr_flags.attr,
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&dev_attr_available_instances.attr,
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&dev_attr_algorithms.attr,
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&dev_attr_region_mmio_size.attr,
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&dev_attr_region_dus_size.attr,
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NULL,
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};
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static umode_t uacce_dev_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct uacce_device *uacce = to_uacce_device(dev);
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if (((attr == &dev_attr_region_mmio_size.attr) &&
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(!uacce->qf_pg_num[UACCE_QFRT_MMIO])) ||
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((attr == &dev_attr_region_dus_size.attr) &&
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(!uacce->qf_pg_num[UACCE_QFRT_DUS])))
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return 0;
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return attr->mode;
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}
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static struct attribute_group uacce_dev_group = {
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.is_visible = uacce_dev_is_visible,
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.attrs = uacce_dev_attrs,
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};
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__ATTRIBUTE_GROUPS(uacce_dev);
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static void uacce_release(struct device *dev)
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{
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struct uacce_device *uacce = to_uacce_device(dev);
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kfree(uacce);
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}
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/**
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* uacce_alloc() - alloc an accelerator
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* @parent: pointer of uacce parent device
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* @interface: pointer of uacce_interface for register
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*
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* Returns uacce pointer if success and ERR_PTR if not
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* Need check returned negotiated uacce->flags
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*/
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struct uacce_device *uacce_alloc(struct device *parent,
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struct uacce_interface *interface)
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{
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unsigned int flags = interface->flags;
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struct uacce_device *uacce;
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int ret;
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uacce = kzalloc(sizeof(struct uacce_device), GFP_KERNEL);
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if (!uacce)
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return ERR_PTR(-ENOMEM);
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if (flags & UACCE_DEV_SVA) {
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ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
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if (ret)
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flags &= ~UACCE_DEV_SVA;
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}
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uacce->parent = parent;
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uacce->flags = flags;
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uacce->ops = interface->ops;
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ret = xa_alloc(&uacce_xa, &uacce->dev_id, uacce, xa_limit_32b,
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GFP_KERNEL);
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if (ret < 0)
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goto err_with_uacce;
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INIT_LIST_HEAD(&uacce->queues);
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mutex_init(&uacce->queues_lock);
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device_initialize(&uacce->dev);
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uacce->dev.devt = MKDEV(MAJOR(uacce_devt), uacce->dev_id);
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uacce->dev.class = uacce_class;
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uacce->dev.groups = uacce_dev_groups;
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uacce->dev.parent = uacce->parent;
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uacce->dev.release = uacce_release;
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dev_set_name(&uacce->dev, "%s-%d", interface->name, uacce->dev_id);
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return uacce;
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err_with_uacce:
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if (flags & UACCE_DEV_SVA)
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iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
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kfree(uacce);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(uacce_alloc);
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/**
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* uacce_register() - add the accelerator to cdev and export to user space
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* @uacce: The initialized uacce device
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*
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* Return 0 if register succeeded, or an error.
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*/
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int uacce_register(struct uacce_device *uacce)
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{
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if (!uacce)
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return -ENODEV;
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uacce->cdev = cdev_alloc();
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if (!uacce->cdev)
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return -ENOMEM;
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uacce->cdev->ops = &uacce_fops;
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uacce->cdev->owner = THIS_MODULE;
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return cdev_device_add(uacce->cdev, &uacce->dev);
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}
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EXPORT_SYMBOL_GPL(uacce_register);
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/**
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* uacce_remove() - remove the accelerator
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* @uacce: the accelerator to remove
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*/
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void uacce_remove(struct uacce_device *uacce)
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{
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struct uacce_queue *q, *next_q;
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if (!uacce)
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return;
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/*
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* unmap remaining mapping from user space, preventing user still
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* access the mmaped area while parent device is already removed
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*/
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if (uacce->inode)
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unmap_mapping_range(uacce->inode->i_mapping, 0, 0, 1);
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/* ensure no open queue remains */
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mutex_lock(&uacce->queues_lock);
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list_for_each_entry_safe(q, next_q, &uacce->queues, list) {
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uacce_put_queue(q);
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uacce_unbind_queue(q);
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}
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mutex_unlock(&uacce->queues_lock);
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/* disable sva now since no opened queues */
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if (uacce->flags & UACCE_DEV_SVA)
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iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
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if (uacce->cdev)
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cdev_device_del(uacce->cdev, &uacce->dev);
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xa_erase(&uacce_xa, uacce->dev_id);
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put_device(&uacce->dev);
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}
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EXPORT_SYMBOL_GPL(uacce_remove);
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static int __init uacce_init(void)
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{
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int ret;
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uacce_class = class_create(THIS_MODULE, UACCE_NAME);
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if (IS_ERR(uacce_class))
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return PTR_ERR(uacce_class);
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ret = alloc_chrdev_region(&uacce_devt, 0, MINORMASK, UACCE_NAME);
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if (ret)
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class_destroy(uacce_class);
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return ret;
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}
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static __exit void uacce_exit(void)
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{
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unregister_chrdev_region(uacce_devt, MINORMASK);
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class_destroy(uacce_class);
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}
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subsys_initcall(uacce_init);
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module_exit(uacce_exit);
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|
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Hisilicon Tech. Co., Ltd.");
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MODULE_DESCRIPTION("Accelerator interface for Userland applications");
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