2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
33 #include <sys/kernel.h>
34 #include <sys/sysctl.h>
36 #include <sys/mutex.h>
38 #include <sys/fcntl.h>
40 #include <sys/filio.h>
41 #include <sys/rwlock.h>
46 #include <machine/stdarg.h>
47 #include <machine/pmap.h>
49 #include <linux/kobject.h>
50 #include <linux/device.h>
51 #include <linux/slab.h>
52 #include <linux/module.h>
53 #include <linux/cdev.h>
54 #include <linux/file.h>
55 #include <linux/sysfs.h>
58 #include <linux/vmalloc.h>
60 #include <vm/vm_pager.h>
62 MALLOC_DEFINE(M_KMALLOC, "linux", "Linux kmalloc compat");
64 #include <linux/rbtree.h>
65 /* Undo Linux compat changes. */
69 #define RB_ROOT(head) (head)->rbh_root
71 /* From sys/queue.h */
72 #define LIST_HEAD(name, type) \
74 struct type *lh_first; /* first element */ \
77 struct kobject class_root;
78 struct device linux_rootdev;
79 struct class miscclass;
80 struct list_head pci_drivers;
81 struct list_head pci_devices;
85 panic_cmp(struct rb_node *one, struct rb_node *two)
90 RB_GENERATE(linux_root, rb_node, __entry, panic_cmp);
93 kobject_set_name(struct kobject *kobj, const char *fmt, ...)
99 error = kobject_set_name_vargs(kobj, fmt, args);
106 kobject_add_complete(struct kobject *kobj, struct kobject *parent)
111 kobj->parent = kobject_get(parent);
112 error = sysfs_create_dir(kobj);
113 if (error == 0 && kobj->ktype && kobj->ktype->default_attrs) {
114 struct attribute **attr;
117 for (attr = t->default_attrs; *attr != NULL; attr++) {
118 error = sysfs_create_file(kobj, *attr);
123 sysfs_remove_dir(kobj);
130 kobject_add(struct kobject *kobj, struct kobject *parent, const char *fmt, ...)
136 error = kobject_set_name_vargs(kobj, fmt, args);
141 return kobject_add_complete(kobj, parent);
145 kobject_release(struct kref *kref)
147 struct kobject *kobj;
150 kobj = container_of(kref, struct kobject, kref);
151 sysfs_remove_dir(kobj);
153 kobject_put(kobj->parent);
156 if (kobj->ktype && kobj->ktype->release)
157 kobj->ktype->release(kobj);
162 kobject_kfree(struct kobject *kobj)
168 kobject_kfree_name(struct kobject *kobj)
175 struct kobj_type kfree_type = { .release = kobject_kfree };
178 dev_release(struct device *dev)
180 pr_debug("dev_release: %s\n", dev_name(dev));
185 device_create(struct class *class, struct device *parent, dev_t devt,
186 void *drvdata, const char *fmt, ...)
191 dev = kzalloc(sizeof(*dev), M_WAITOK);
192 dev->parent = parent;
195 dev->driver_data = drvdata;
196 dev->release = dev_release;
198 kobject_set_name_vargs(&dev->kobj, fmt, args);
200 device_register(dev);
206 kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
207 struct kobject *parent, const char *fmt, ...)
212 kobject_init(kobj, ktype);
214 kobj->parent = parent;
218 error = kobject_set_name_vargs(kobj, fmt, args);
222 return kobject_add_complete(kobj, parent);
226 linux_file_dtor(void *cdp)
228 struct linux_file *filp;
231 filp->f_op->release(filp->f_vnode, filp);
232 vdrop(filp->f_vnode);
237 linux_dev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
239 struct linux_cdev *ldev;
240 struct linux_file *filp;
244 file = curthread->td_fpop;
248 filp = kzalloc(sizeof(*filp), GFP_KERNEL);
249 filp->f_dentry = &filp->f_dentry_store;
250 filp->f_op = ldev->ops;
251 filp->f_flags = file->f_flag;
252 vhold(file->f_vnode);
253 filp->f_vnode = file->f_vnode;
254 if (filp->f_op->open) {
255 error = -filp->f_op->open(file->f_vnode, filp);
261 error = devfs_set_cdevpriv(filp, linux_file_dtor);
263 filp->f_op->release(file->f_vnode, filp);
272 linux_dev_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
274 struct linux_cdev *ldev;
275 struct linux_file *filp;
279 file = curthread->td_fpop;
283 if ((error = devfs_get_cdevpriv((void **)&filp)) != 0)
285 filp->f_flags = file->f_flag;
286 devfs_clear_cdevpriv();
293 linux_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
296 struct linux_cdev *ldev;
297 struct linux_file *filp;
301 file = curthread->td_fpop;
305 if ((error = devfs_get_cdevpriv((void **)&filp)) != 0)
307 filp->f_flags = file->f_flag;
309 * Linux does not have a generic ioctl copyin/copyout layer. All
310 * linux ioctls must be converted to void ioctls which pass a
311 * pointer to the address of the data. We want the actual user
312 * address so we dereference here.
314 data = *(void **)data;
315 if (filp->f_op->unlocked_ioctl)
316 error = -filp->f_op->unlocked_ioctl(filp, cmd, (u_long)data);
324 linux_dev_read(struct cdev *dev, struct uio *uio, int ioflag)
326 struct linux_cdev *ldev;
327 struct linux_file *filp;
332 file = curthread->td_fpop;
336 if ((error = devfs_get_cdevpriv((void **)&filp)) != 0)
338 filp->f_flags = file->f_flag;
339 if (uio->uio_iovcnt != 1)
340 panic("linux_dev_read: uio %p iovcnt %d",
341 uio, uio->uio_iovcnt);
342 if (filp->f_op->read) {
343 bytes = filp->f_op->read(filp, uio->uio_iov->iov_base,
344 uio->uio_iov->iov_len, &uio->uio_offset);
346 uio->uio_iov->iov_base += bytes;
347 uio->uio_iov->iov_len -= bytes;
348 uio->uio_resid -= bytes;
358 linux_dev_write(struct cdev *dev, struct uio *uio, int ioflag)
360 struct linux_cdev *ldev;
361 struct linux_file *filp;
366 file = curthread->td_fpop;
370 if ((error = devfs_get_cdevpriv((void **)&filp)) != 0)
372 filp->f_flags = file->f_flag;
373 if (uio->uio_iovcnt != 1)
374 panic("linux_dev_write: uio %p iovcnt %d",
375 uio, uio->uio_iovcnt);
376 if (filp->f_op->write) {
377 bytes = filp->f_op->write(filp, uio->uio_iov->iov_base,
378 uio->uio_iov->iov_len, &uio->uio_offset);
380 uio->uio_iov->iov_base += bytes;
381 uio->uio_iov->iov_len -= bytes;
382 uio->uio_resid -= bytes;
392 linux_dev_poll(struct cdev *dev, int events, struct thread *td)
394 struct linux_cdev *ldev;
395 struct linux_file *filp;
400 file = curthread->td_fpop;
404 if ((error = devfs_get_cdevpriv((void **)&filp)) != 0)
406 filp->f_flags = file->f_flag;
407 if (filp->f_op->poll)
408 revents = filp->f_op->poll(filp, NULL) & events;
416 linux_dev_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
417 int nprot, vm_memattr_t *memattr)
420 /* XXX memattr not honored. */
426 linux_dev_mmap_single(struct cdev *dev, vm_ooffset_t *offset,
427 vm_size_t size, struct vm_object **object, int nprot)
429 struct linux_cdev *ldev;
430 struct linux_file *filp;
432 struct vm_area_struct vma;
437 file = curthread->td_fpop;
441 if (size != PAGE_SIZE)
443 if ((error = devfs_get_cdevpriv((void **)&filp)) != 0)
445 filp->f_flags = file->f_flag;
447 vma.vm_end = PAGE_SIZE;
448 vma.vm_pgoff = *offset / PAGE_SIZE;
450 vma.vm_page_prot = 0;
451 if (filp->f_op->mmap) {
452 error = -filp->f_op->mmap(filp, &vma);
454 paddr = (vm_paddr_t)vma.vm_pfn << PAGE_SHIFT;
456 m = PHYS_TO_VM_PAGE(paddr);
457 *object = vm_pager_allocate(OBJT_DEVICE, dev,
458 PAGE_SIZE, nprot, *offset, curthread->td_ucred);
461 if (vma.vm_page_prot != VM_MEMATTR_DEFAULT)
462 pmap_page_set_memattr(m, vma.vm_page_prot);
470 struct cdevsw linuxcdevsw = {
471 .d_version = D_VERSION,
472 .d_flags = D_TRACKCLOSE,
473 .d_open = linux_dev_open,
474 .d_close = linux_dev_close,
475 .d_read = linux_dev_read,
476 .d_write = linux_dev_write,
477 .d_ioctl = linux_dev_ioctl,
478 .d_mmap_single = linux_dev_mmap_single,
479 .d_mmap = linux_dev_mmap,
480 .d_poll = linux_dev_poll,
484 linux_file_read(struct file *file, struct uio *uio, struct ucred *active_cred,
485 int flags, struct thread *td)
487 struct linux_file *filp;
492 filp = (struct linux_file *)file->f_data;
493 filp->f_flags = file->f_flag;
494 if (uio->uio_iovcnt != 1)
495 panic("linux_file_read: uio %p iovcnt %d",
496 uio, uio->uio_iovcnt);
497 if (filp->f_op->read) {
498 bytes = filp->f_op->read(filp, uio->uio_iov->iov_base,
499 uio->uio_iov->iov_len, &uio->uio_offset);
501 uio->uio_iov->iov_base += bytes;
502 uio->uio_iov->iov_len -= bytes;
503 uio->uio_resid -= bytes;
513 linux_file_poll(struct file *file, int events, struct ucred *active_cred,
516 struct linux_file *filp;
519 filp = (struct linux_file *)file->f_data;
520 filp->f_flags = file->f_flag;
521 if (filp->f_op->poll)
522 revents = filp->f_op->poll(filp, NULL) & events;
530 linux_file_close(struct file *file, struct thread *td)
532 struct linux_file *filp;
535 filp = (struct linux_file *)file->f_data;
536 filp->f_flags = file->f_flag;
537 error = -filp->f_op->release(NULL, filp);
538 funsetown(&filp->f_sigio);
545 linux_file_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *cred,
548 struct linux_file *filp;
551 filp = (struct linux_file *)fp->f_data;
552 filp->f_flags = fp->f_flag;
559 if (filp->f_op->fasync == NULL)
561 error = filp->f_op->fasync(0, filp, fp->f_flag & FASYNC);
564 error = fsetown(*(int *)data, &filp->f_sigio);
566 error = filp->f_op->fasync(0, filp,
567 fp->f_flag & FASYNC);
570 *(int *)data = fgetown(&filp->f_sigio);
579 struct fileops linuxfileops = {
580 .fo_read = linux_file_read,
581 .fo_poll = linux_file_poll,
582 .fo_close = linux_file_close,
583 .fo_ioctl = linux_file_ioctl,
584 .fo_chmod = invfo_chmod,
585 .fo_chown = invfo_chown,
586 .fo_sendfile = invfo_sendfile,
590 * Hash of vmmap addresses. This is infrequently accessed and does not
591 * need to be particularly large. This is done because we must store the
592 * caller's idea of the map size to properly unmap.
595 LIST_ENTRY(vmmap) vm_next;
597 unsigned long vm_size;
600 LIST_HEAD(vmmaphd, vmmap);
601 #define VMMAP_HASH_SIZE 64
602 #define VMMAP_HASH_MASK (VMMAP_HASH_SIZE - 1)
603 #define VM_HASH(addr) ((uintptr_t)(addr) >> PAGE_SHIFT) & VMMAP_HASH_MASK
604 static struct vmmaphd vmmaphead[VMMAP_HASH_SIZE];
605 static struct mtx vmmaplock;
608 vmmap_add(void *addr, unsigned long size)
612 vmmap = kmalloc(sizeof(*vmmap), GFP_KERNEL);
613 mtx_lock(&vmmaplock);
614 vmmap->vm_size = size;
615 vmmap->vm_addr = addr;
616 LIST_INSERT_HEAD(&vmmaphead[VM_HASH(addr)], vmmap, vm_next);
617 mtx_unlock(&vmmaplock);
620 static struct vmmap *
621 vmmap_remove(void *addr)
625 mtx_lock(&vmmaplock);
626 LIST_FOREACH(vmmap, &vmmaphead[VM_HASH(addr)], vm_next)
627 if (vmmap->vm_addr == addr)
630 LIST_REMOVE(vmmap, vm_next);
631 mtx_unlock(&vmmaplock);
637 _ioremap_attr(vm_paddr_t phys_addr, unsigned long size, int attr)
641 addr = pmap_mapdev_attr(phys_addr, size, attr);
644 vmmap_add(addr, size);
654 vmmap = vmmap_remove(addr);
657 pmap_unmapdev((vm_offset_t)addr, vmmap->vm_size);
663 vmap(struct page **pages, unsigned int count, unsigned long flags, int prot)
668 size = count * PAGE_SIZE;
669 off = kva_alloc(size);
672 vmmap_add((void *)off, size);
673 pmap_qenter(off, pages, count);
675 return ((void *)off);
683 vmmap = vmmap_remove(addr);
686 pmap_qremove((vm_offset_t)addr, vmmap->vm_size / PAGE_SIZE);
687 kva_free((vm_offset_t)addr, vmmap->vm_size);
692 linux_compat_init(void)
694 struct sysctl_oid *rootoid;
697 rootoid = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(),
698 OID_AUTO, "sys", CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, "sys");
699 kobject_init(&class_root, &class_ktype);
700 kobject_set_name(&class_root, "class");
701 class_root.oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(rootoid),
702 OID_AUTO, "class", CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, "class");
703 kobject_init(&linux_rootdev.kobj, &dev_ktype);
704 kobject_set_name(&linux_rootdev.kobj, "device");
705 linux_rootdev.kobj.oidp = SYSCTL_ADD_NODE(NULL,
706 SYSCTL_CHILDREN(rootoid), OID_AUTO, "device", CTLFLAG_RD, NULL,
708 linux_rootdev.bsddev = root_bus;
709 miscclass.name = "misc";
710 class_register(&miscclass);
711 INIT_LIST_HEAD(&pci_drivers);
712 INIT_LIST_HEAD(&pci_devices);
713 spin_lock_init(&pci_lock);
714 mtx_init(&vmmaplock, "IO Map lock", NULL, MTX_DEF);
715 for (i = 0; i < VMMAP_HASH_SIZE; i++)
716 LIST_INIT(&vmmaphead[i]);
719 SYSINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_init, NULL);
722 linux_compat_uninit(void)
724 kobject_kfree_name(&class_root);
725 kobject_kfree_name(&linux_rootdev.kobj);
726 kobject_kfree_name(&miscclass.kobj);
728 SYSUNINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_uninit, NULL);