123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503 |
- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1990 University of Utah.
- * Copyright (c) 1991, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * the Systems Programming Group of the University of Utah Computer
- * Science Department.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/conf.h>
- #include <sys/lock.h>
- #include <sys/proc.h>
- #include <sys/mutex.h>
- #include <sys/mman.h>
- #include <sys/rwlock.h>
- #include <sys/sx.h>
- #include <sys/user.h>
- #include <sys/vmmeter.h>
- #include <vm/vm.h>
- #include <vm/vm_param.h>
- #include <vm/vm_object.h>
- #include <vm/vm_page.h>
- #include <vm/vm_pager.h>
- #include <vm/vm_phys.h>
- #include <vm/uma.h>
- static void dev_pager_init(void);
- static vm_object_t dev_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
- vm_ooffset_t, struct ucred *);
- static void dev_pager_dealloc(vm_object_t);
- static int dev_pager_getpages(vm_object_t, vm_page_t *, int, int *, int *);
- static void dev_pager_putpages(vm_object_t, vm_page_t *, int, int, int *);
- static boolean_t dev_pager_haspage(vm_object_t, vm_pindex_t, int *, int *);
- static void dev_pager_free_page(vm_object_t object, vm_page_t m);
- static int dev_pager_populate(vm_object_t object, vm_pindex_t pidx,
- int fault_type, vm_prot_t, vm_pindex_t *first, vm_pindex_t *last);
- /* list of device pager objects */
- static struct pagerlst dev_pager_object_list;
- /* protect list manipulation */
- static struct mtx dev_pager_mtx;
- const struct pagerops devicepagerops = {
- .pgo_kvme_type = KVME_TYPE_DEVICE,
- .pgo_init = dev_pager_init,
- .pgo_alloc = dev_pager_alloc,
- .pgo_dealloc = dev_pager_dealloc,
- .pgo_getpages = dev_pager_getpages,
- .pgo_putpages = dev_pager_putpages,
- .pgo_haspage = dev_pager_haspage,
- };
- const struct pagerops mgtdevicepagerops = {
- .pgo_kvme_type = KVME_TYPE_MGTDEVICE,
- .pgo_alloc = dev_pager_alloc,
- .pgo_dealloc = dev_pager_dealloc,
- .pgo_getpages = dev_pager_getpages,
- .pgo_putpages = dev_pager_putpages,
- .pgo_haspage = dev_pager_haspage,
- .pgo_populate = dev_pager_populate,
- };
- static int old_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
- vm_ooffset_t foff, struct ucred *cred, u_short *color);
- static void old_dev_pager_dtor(void *handle);
- static int old_dev_pager_fault(vm_object_t object, vm_ooffset_t offset,
- int prot, vm_page_t *mres);
- static const struct cdev_pager_ops old_dev_pager_ops = {
- .cdev_pg_ctor = old_dev_pager_ctor,
- .cdev_pg_dtor = old_dev_pager_dtor,
- .cdev_pg_fault = old_dev_pager_fault
- };
- static void
- dev_pager_init(void)
- {
- TAILQ_INIT(&dev_pager_object_list);
- mtx_init(&dev_pager_mtx, "dev_pager list", NULL, MTX_DEF);
- }
- vm_object_t
- cdev_pager_lookup(void *handle)
- {
- vm_object_t object;
- again:
- mtx_lock(&dev_pager_mtx);
- object = vm_pager_object_lookup(&dev_pager_object_list, handle);
- if (object != NULL && object->un_pager.devp.dev == NULL) {
- msleep(&object->un_pager.devp.dev, &dev_pager_mtx,
- PVM | PDROP, "cdplkp", 0);
- vm_object_deallocate(object);
- goto again;
- }
- mtx_unlock(&dev_pager_mtx);
- return (object);
- }
- vm_object_t
- cdev_pager_allocate(void *handle, enum obj_type tp,
- const struct cdev_pager_ops *ops, vm_ooffset_t size, vm_prot_t prot,
- vm_ooffset_t foff, struct ucred *cred)
- {
- vm_object_t object;
- vm_pindex_t pindex;
- if (tp != OBJT_DEVICE && tp != OBJT_MGTDEVICE)
- return (NULL);
- KASSERT(tp == OBJT_MGTDEVICE || ops->cdev_pg_populate == NULL,
- ("populate on unmanaged device pager"));
- /*
- * Offset should be page aligned.
- */
- if (foff & PAGE_MASK)
- return (NULL);
- /*
- * Treat the mmap(2) file offset as an unsigned value for a
- * device mapping. This, in effect, allows a user to pass all
- * possible off_t values as the mapping cookie to the driver. At
- * this point, we know that both foff and size are a multiple
- * of the page size. Do a check to avoid wrap.
- */
- size = round_page(size);
- pindex = OFF_TO_IDX(foff) + OFF_TO_IDX(size);
- if (pindex > OBJ_MAX_SIZE || pindex < OFF_TO_IDX(foff) ||
- pindex < OFF_TO_IDX(size))
- return (NULL);
- again:
- mtx_lock(&dev_pager_mtx);
- /*
- * Look up pager, creating as necessary.
- */
- object = vm_pager_object_lookup(&dev_pager_object_list, handle);
- if (object == NULL) {
- vm_object_t object1;
- /*
- * Allocate object and associate it with the pager. Initialize
- * the object's pg_color based upon the physical address of the
- * device's memory.
- */
- mtx_unlock(&dev_pager_mtx);
- object1 = vm_object_allocate(tp, pindex);
- mtx_lock(&dev_pager_mtx);
- object = vm_pager_object_lookup(&dev_pager_object_list, handle);
- if (object != NULL) {
- object1->type = OBJT_DEAD;
- vm_object_deallocate(object1);
- object1 = NULL;
- if (object->un_pager.devp.dev == NULL) {
- msleep(&object->un_pager.devp.dev,
- &dev_pager_mtx, PVM | PDROP, "cdplkp", 0);
- vm_object_deallocate(object);
- goto again;
- }
- /*
- * We raced with other thread while allocating object.
- */
- if (pindex > object->size)
- object->size = pindex;
- KASSERT(object->type == tp,
- ("Inconsistent device pager type %p %d",
- object, tp));
- KASSERT(object->un_pager.devp.ops == ops,
- ("Inconsistent devops %p %p", object, ops));
- } else {
- u_short color;
- object = object1;
- object1 = NULL;
- object->handle = handle;
- object->un_pager.devp.ops = ops;
- TAILQ_INIT(&object->un_pager.devp.devp_pglist);
- TAILQ_INSERT_TAIL(&dev_pager_object_list, object,
- pager_object_list);
- mtx_unlock(&dev_pager_mtx);
- if (ops->cdev_pg_populate != NULL)
- vm_object_set_flag(object, OBJ_POPULATE);
- if (ops->cdev_pg_ctor(handle, size, prot, foff,
- cred, &color) != 0) {
- mtx_lock(&dev_pager_mtx);
- TAILQ_REMOVE(&dev_pager_object_list, object,
- pager_object_list);
- wakeup(&object->un_pager.devp.dev);
- mtx_unlock(&dev_pager_mtx);
- object->type = OBJT_DEAD;
- vm_object_deallocate(object);
- object = NULL;
- mtx_lock(&dev_pager_mtx);
- } else {
- mtx_lock(&dev_pager_mtx);
- object->flags |= OBJ_COLORED;
- object->pg_color = color;
- object->un_pager.devp.dev = handle;
- wakeup(&object->un_pager.devp.dev);
- }
- }
- MPASS(object1 == NULL);
- } else {
- if (object->un_pager.devp.dev == NULL) {
- msleep(&object->un_pager.devp.dev,
- &dev_pager_mtx, PVM | PDROP, "cdplkp", 0);
- vm_object_deallocate(object);
- goto again;
- }
- if (pindex > object->size)
- object->size = pindex;
- KASSERT(object->type == tp,
- ("Inconsistent device pager type %p %d", object, tp));
- }
- mtx_unlock(&dev_pager_mtx);
- return (object);
- }
- static vm_object_t
- dev_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
- vm_ooffset_t foff, struct ucred *cred)
- {
- return (cdev_pager_allocate(handle, OBJT_DEVICE, &old_dev_pager_ops,
- size, prot, foff, cred));
- }
- void
- cdev_pager_free_page(vm_object_t object, vm_page_t m)
- {
- VM_OBJECT_ASSERT_WLOCKED(object);
- if (object->type == OBJT_MGTDEVICE) {
- KASSERT((m->oflags & VPO_UNMANAGED) == 0, ("unmanaged %p", m));
- pmap_remove_all(m);
- (void)vm_page_remove(m);
- } else if (object->type == OBJT_DEVICE)
- dev_pager_free_page(object, m);
- }
- static void
- dev_pager_free_page(vm_object_t object, vm_page_t m)
- {
- VM_OBJECT_ASSERT_WLOCKED(object);
- KASSERT((object->type == OBJT_DEVICE &&
- (m->oflags & VPO_UNMANAGED) != 0),
- ("Managed device or page obj %p m %p", object, m));
- TAILQ_REMOVE(&object->un_pager.devp.devp_pglist, m, plinks.q);
- vm_page_putfake(m);
- }
- static void
- dev_pager_dealloc(vm_object_t object)
- {
- vm_page_t m;
- VM_OBJECT_WUNLOCK(object);
- object->un_pager.devp.ops->cdev_pg_dtor(object->un_pager.devp.dev);
- mtx_lock(&dev_pager_mtx);
- TAILQ_REMOVE(&dev_pager_object_list, object, pager_object_list);
- mtx_unlock(&dev_pager_mtx);
- VM_OBJECT_WLOCK(object);
- if (object->type == OBJT_DEVICE) {
- /*
- * Free up our fake pages.
- */
- while ((m = TAILQ_FIRST(&object->un_pager.devp.devp_pglist))
- != NULL) {
- if (vm_page_busy_acquire(m, VM_ALLOC_WAITFAIL) == 0)
- continue;
- dev_pager_free_page(object, m);
- }
- }
- object->handle = NULL;
- object->type = OBJT_DEAD;
- }
- static int
- dev_pager_getpages(vm_object_t object, vm_page_t *ma, int count, int *rbehind,
- int *rahead)
- {
- int error;
- /* Since our haspage reports zero after/before, the count is 1. */
- KASSERT(count == 1, ("%s: count %d", __func__, count));
- if (object->un_pager.devp.ops->cdev_pg_fault == NULL)
- return (VM_PAGER_FAIL);
- VM_OBJECT_WLOCK(object);
- error = object->un_pager.devp.ops->cdev_pg_fault(object,
- IDX_TO_OFF(ma[0]->pindex), PROT_READ, &ma[0]);
- VM_OBJECT_ASSERT_WLOCKED(object);
- if (error == VM_PAGER_OK) {
- KASSERT((object->type == OBJT_DEVICE &&
- (ma[0]->oflags & VPO_UNMANAGED) != 0) ||
- (object->type == OBJT_MGTDEVICE &&
- (ma[0]->oflags & VPO_UNMANAGED) == 0),
- ("Wrong page type %p %p", ma[0], object));
- if (object->type == OBJT_DEVICE) {
- TAILQ_INSERT_TAIL(&object->un_pager.devp.devp_pglist,
- ma[0], plinks.q);
- }
- if (rbehind)
- *rbehind = 0;
- if (rahead)
- *rahead = 0;
- }
- VM_OBJECT_WUNLOCK(object);
- return (error);
- }
- static int
- dev_pager_populate(vm_object_t object, vm_pindex_t pidx, int fault_type,
- vm_prot_t max_prot, vm_pindex_t *first, vm_pindex_t *last)
- {
- VM_OBJECT_ASSERT_WLOCKED(object);
- if (object->un_pager.devp.ops->cdev_pg_populate == NULL)
- return (VM_PAGER_FAIL);
- return (object->un_pager.devp.ops->cdev_pg_populate(object, pidx,
- fault_type, max_prot, first, last));
- }
- static int
- old_dev_pager_fault(vm_object_t object, vm_ooffset_t offset, int prot,
- vm_page_t *mres)
- {
- vm_paddr_t paddr;
- vm_page_t m_paddr, page;
- struct cdev *dev;
- struct cdevsw *csw;
- struct file *fpop;
- struct thread *td;
- vm_memattr_t memattr, memattr1;
- int ref, ret;
- memattr = object->memattr;
- VM_OBJECT_WUNLOCK(object);
- dev = object->handle;
- csw = dev_refthread(dev, &ref);
- if (csw == NULL) {
- VM_OBJECT_WLOCK(object);
- return (VM_PAGER_FAIL);
- }
- td = curthread;
- fpop = td->td_fpop;
- td->td_fpop = NULL;
- ret = csw->d_mmap(dev, offset, &paddr, prot, &memattr);
- td->td_fpop = fpop;
- dev_relthread(dev, ref);
- if (ret != 0) {
- printf(
- "WARNING: dev_pager_getpage: map function returns error %d", ret);
- VM_OBJECT_WLOCK(object);
- return (VM_PAGER_FAIL);
- }
- /* If "paddr" is a real page, perform a sanity check on "memattr". */
- if ((m_paddr = vm_phys_paddr_to_vm_page(paddr)) != NULL &&
- (memattr1 = pmap_page_get_memattr(m_paddr)) != memattr) {
- /*
- * For the /dev/mem d_mmap routine to return the
- * correct memattr, pmap_page_get_memattr() needs to
- * be called, which we do there.
- */
- if ((csw->d_flags & D_MEM) == 0) {
- printf("WARNING: Device driver %s has set "
- "\"memattr\" inconsistently (drv %u pmap %u).\n",
- csw->d_name, memattr, memattr1);
- }
- memattr = memattr1;
- }
- if (((*mres)->flags & PG_FICTITIOUS) != 0) {
- /*
- * If the passed in result page is a fake page, update it with
- * the new physical address.
- */
- page = *mres;
- VM_OBJECT_WLOCK(object);
- vm_page_updatefake(page, paddr, memattr);
- } else {
- /*
- * Replace the passed in reqpage page with our own fake page and
- * free up the all of the original pages.
- */
- page = vm_page_getfake(paddr, memattr);
- VM_OBJECT_WLOCK(object);
- vm_page_replace(page, object, (*mres)->pindex, *mres);
- *mres = page;
- }
- vm_page_valid(page);
- return (VM_PAGER_OK);
- }
- static void
- dev_pager_putpages(vm_object_t object, vm_page_t *m, int count, int flags,
- int *rtvals)
- {
- panic("dev_pager_putpage called");
- }
- static boolean_t
- dev_pager_haspage(vm_object_t object, vm_pindex_t pindex, int *before,
- int *after)
- {
- if (before != NULL)
- *before = 0;
- if (after != NULL)
- *after = 0;
- return (TRUE);
- }
- static int
- old_dev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
- vm_ooffset_t foff, struct ucred *cred, u_short *color)
- {
- struct cdev *dev;
- struct cdevsw *csw;
- vm_memattr_t dummy;
- vm_ooffset_t off;
- vm_paddr_t paddr;
- unsigned int npages;
- int ref;
- /*
- * Make sure this device can be mapped.
- */
- dev = handle;
- csw = dev_refthread(dev, &ref);
- if (csw == NULL)
- return (ENXIO);
- /*
- * Check that the specified range of the device allows the desired
- * protection.
- *
- * XXX assumes VM_PROT_* == PROT_*
- */
- npages = OFF_TO_IDX(size);
- paddr = 0; /* Make paddr initialized for the case of size == 0. */
- for (off = foff; npages--; off += PAGE_SIZE) {
- if (csw->d_mmap(dev, off, &paddr, (int)prot, &dummy) != 0) {
- dev_relthread(dev, ref);
- return (EINVAL);
- }
- }
- dev_ref(dev);
- dev_relthread(dev, ref);
- *color = atop(paddr) - OFF_TO_IDX(off - PAGE_SIZE);
- return (0);
- }
- static void
- old_dev_pager_dtor(void *handle)
- {
- dev_rel(handle);
- }
|