1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
3 #include <linux/init.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
7 #include <linux/device.h>
8 #include <linux/sched/task.h>
9 #include <linux/intel-svm.h>
10 #include <linux/io-64-nonatomic-lo-hi.h>
11 #include <linux/cdev.h>
13 #include <linux/poll.h>
14 #include <uapi/linux/idxd.h>
15 #include "registers.h"
18 struct idxd_cdev_context {
25 * ictx is an array based off of accelerator types. enum idxd_type
28 static struct idxd_cdev_context ictx[IDXD_TYPE_MAX] = {
32 struct idxd_user_context {
34 struct task_struct *task;
38 enum idxd_cdev_cleanup {
43 static void idxd_cdev_dev_release(struct device *dev)
45 dev_dbg(dev, "releasing cdev device\n");
49 static struct device_type idxd_cdev_device_type = {
51 .release = idxd_cdev_dev_release,
54 static inline struct idxd_cdev *inode_idxd_cdev(struct inode *inode)
56 struct cdev *cdev = inode->i_cdev;
58 return container_of(cdev, struct idxd_cdev, cdev);
61 static inline struct idxd_wq *idxd_cdev_wq(struct idxd_cdev *idxd_cdev)
63 return container_of(idxd_cdev, struct idxd_wq, idxd_cdev);
66 static inline struct idxd_wq *inode_wq(struct inode *inode)
68 return idxd_cdev_wq(inode_idxd_cdev(inode));
71 static int idxd_cdev_open(struct inode *inode, struct file *filp)
73 struct idxd_user_context *ctx;
74 struct idxd_device *idxd;
77 struct idxd_cdev *idxd_cdev;
81 dev = &idxd->pdev->dev;
82 idxd_cdev = &wq->idxd_cdev;
84 dev_dbg(dev, "%s called\n", __func__);
86 if (idxd_wq_refcount(wq) > 1 && wq_dedicated(wq))
89 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
94 filp->private_data = ctx;
99 static int idxd_cdev_release(struct inode *node, struct file *filep)
101 struct idxd_user_context *ctx = filep->private_data;
102 struct idxd_wq *wq = ctx->wq;
103 struct idxd_device *idxd = wq->idxd;
104 struct device *dev = &idxd->pdev->dev;
106 dev_dbg(dev, "%s called\n", __func__);
107 filep->private_data = NULL;
114 static int check_vma(struct idxd_wq *wq, struct vm_area_struct *vma,
117 struct device *dev = &wq->idxd->pdev->dev;
119 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) {
120 dev_info_ratelimited(dev,
121 "%s: %s: mapping too large: %lu\n",
123 vma->vm_end - vma->vm_start);
130 static int idxd_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
132 struct idxd_user_context *ctx = filp->private_data;
133 struct idxd_wq *wq = ctx->wq;
134 struct idxd_device *idxd = wq->idxd;
135 struct pci_dev *pdev = idxd->pdev;
136 phys_addr_t base = pci_resource_start(pdev, IDXD_WQ_BAR);
140 dev_dbg(&pdev->dev, "%s called\n", __func__);
141 rc = check_vma(wq, vma, __func__);
143 vma->vm_flags |= VM_DONTCOPY;
144 pfn = (base + idxd_get_wq_portal_full_offset(wq->id,
145 IDXD_PORTAL_LIMITED)) >> PAGE_SHIFT;
146 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
147 vma->vm_private_data = ctx;
149 return io_remap_pfn_range(vma, vma->vm_start, pfn, PAGE_SIZE,
153 static __poll_t idxd_cdev_poll(struct file *filp,
154 struct poll_table_struct *wait)
156 struct idxd_user_context *ctx = filp->private_data;
157 struct idxd_wq *wq = ctx->wq;
158 struct idxd_device *idxd = wq->idxd;
159 struct idxd_cdev *idxd_cdev = &wq->idxd_cdev;
163 poll_wait(filp, &idxd_cdev->err_queue, wait);
164 spin_lock_irqsave(&idxd->dev_lock, flags);
165 if (idxd->sw_err.valid)
166 out = EPOLLIN | EPOLLRDNORM;
167 spin_unlock_irqrestore(&idxd->dev_lock, flags);
172 static const struct file_operations idxd_cdev_fops = {
173 .owner = THIS_MODULE,
174 .open = idxd_cdev_open,
175 .release = idxd_cdev_release,
176 .mmap = idxd_cdev_mmap,
177 .poll = idxd_cdev_poll,
180 int idxd_cdev_get_major(struct idxd_device *idxd)
182 return MAJOR(ictx[idxd->type].devt);
185 static int idxd_wq_cdev_dev_setup(struct idxd_wq *wq)
187 struct idxd_device *idxd = wq->idxd;
188 struct idxd_cdev *idxd_cdev = &wq->idxd_cdev;
189 struct idxd_cdev_context *cdev_ctx;
193 idxd_cdev->dev = kzalloc(sizeof(*idxd_cdev->dev), GFP_KERNEL);
197 dev = idxd_cdev->dev;
198 dev->parent = &idxd->pdev->dev;
199 dev_set_name(dev, "%s/wq%u.%u", idxd_get_dev_name(idxd),
201 dev->bus = idxd_get_bus_type(idxd);
203 cdev_ctx = &ictx[wq->idxd->type];
204 minor = ida_simple_get(&cdev_ctx->minor_ida, 0, MINORMASK, GFP_KERNEL);
210 dev->devt = MKDEV(MAJOR(cdev_ctx->devt), minor);
211 dev->type = &idxd_cdev_device_type;
212 rc = device_register(dev);
214 dev_err(&idxd->pdev->dev, "device register failed\n");
218 idxd_cdev->minor = minor;
223 ida_simple_remove(&cdev_ctx->minor_ida, MINOR(dev->devt));
226 idxd_cdev->dev = NULL;
230 static void idxd_wq_cdev_cleanup(struct idxd_wq *wq,
231 enum idxd_cdev_cleanup cdev_state)
233 struct idxd_cdev *idxd_cdev = &wq->idxd_cdev;
234 struct idxd_cdev_context *cdev_ctx;
236 cdev_ctx = &ictx[wq->idxd->type];
237 if (cdev_state == CDEV_NORMAL)
238 cdev_del(&idxd_cdev->cdev);
239 device_unregister(idxd_cdev->dev);
241 * The device_type->release() will be called on the device and free
242 * the allocated struct device. We can just forget it.
244 ida_simple_remove(&cdev_ctx->minor_ida, idxd_cdev->minor);
245 idxd_cdev->dev = NULL;
246 idxd_cdev->minor = -1;
249 int idxd_wq_add_cdev(struct idxd_wq *wq)
251 struct idxd_cdev *idxd_cdev = &wq->idxd_cdev;
252 struct cdev *cdev = &idxd_cdev->cdev;
256 rc = idxd_wq_cdev_dev_setup(wq);
260 dev = idxd_cdev->dev;
261 cdev_init(cdev, &idxd_cdev_fops);
262 cdev_set_parent(cdev, &dev->kobj);
263 rc = cdev_add(cdev, dev->devt, 1);
265 dev_dbg(&wq->idxd->pdev->dev, "cdev_add failed: %d\n", rc);
266 idxd_wq_cdev_cleanup(wq, CDEV_FAILED);
270 init_waitqueue_head(&idxd_cdev->err_queue);
274 void idxd_wq_del_cdev(struct idxd_wq *wq)
276 idxd_wq_cdev_cleanup(wq, CDEV_NORMAL);
279 int idxd_cdev_register(void)
283 for (i = 0; i < IDXD_TYPE_MAX; i++) {
284 ida_init(&ictx[i].minor_ida);
285 rc = alloc_chrdev_region(&ictx[i].devt, 0, MINORMASK,
294 void idxd_cdev_remove(void)
298 for (i = 0; i < IDXD_TYPE_MAX; i++) {
299 unregister_chrdev_region(ictx[i].devt, MINORMASK);
300 ida_destroy(&ictx[i].minor_ida);