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Implement gnttab interface on NetBSD. The kernel interface is different from FreeBSD so we can't use the FreeBSD version Signed-off-by: Manuel Bouyer <bouyer@netbsd.org> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
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/* | ||
* Copyright (c) 2007-2008, D G Murray <Derek.Murray@cl.cam.ac.uk> | ||
* Copyright (c) 2016-2017, Akshay Jaggi <jaggi@FreeBSD.org> | ||
* | ||
* This library is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU Lesser General Public | ||
* License as published by the Free Software Foundation; | ||
* version 2.1 of the License. | ||
* | ||
* This library is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* Lesser General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU Lesser General Public | ||
* License along with this library; If not, see <http://www.gnu.org/licenses/>. | ||
* | ||
* Split out from linux.c | ||
*/ | ||
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#include <fcntl.h> | ||
#include <errno.h> | ||
#include <unistd.h> | ||
#include <stdlib.h> | ||
#include <stdint.h> | ||
#include <string.h> | ||
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#include <sys/ioctl.h> | ||
#include <sys/mman.h> | ||
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#include <xen/xen.h> | ||
#include <xen/xenio.h> | ||
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#include "private.h" | ||
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#define PAGE_SHIFT 12 | ||
#define PAGE_SIZE (1UL << PAGE_SHIFT) | ||
#define PAGE_MASK (~(PAGE_SIZE-1)) | ||
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#define DEVXEN "/kern/xen/privcmd" | ||
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int osdep_gnttab_open(xengnttab_handle *xgt) | ||
{ | ||
int fd = open(DEVXEN, O_RDWR | O_CLOEXEC); | ||
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if ( fd == -1 ) | ||
return -1; | ||
xgt->fd = fd; | ||
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return 0; | ||
} | ||
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int osdep_gnttab_close(xengnttab_handle *xgt) | ||
{ | ||
if ( xgt->fd == -1 ) | ||
return 0; | ||
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return close(xgt->fd); | ||
} | ||
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int osdep_gnttab_set_max_grants(xengnttab_handle *xgt, uint32_t count) | ||
{ | ||
return 0; | ||
} | ||
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void *osdep_gnttab_grant_map(xengnttab_handle *xgt, | ||
uint32_t count, int flags, int prot, | ||
uint32_t *domids, uint32_t *refs, | ||
uint32_t notify_offset, | ||
evtchn_port_t notify_port) | ||
{ | ||
uint32_t i; | ||
int fd = xgt->fd; | ||
struct ioctl_gntdev_mmap_grant_ref map; | ||
void *addr = NULL; | ||
int domids_stride; | ||
unsigned int refs_size = count * sizeof(struct ioctl_gntdev_grant_ref); | ||
int rv; | ||
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domids_stride = !!(flags & XENGNTTAB_GRANT_MAP_SINGLE_DOMAIN); | ||
map.refs = malloc(refs_size); | ||
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for ( i = 0; i < count; i++ ) | ||
{ | ||
map.refs[i].domid = domids[i * domids_stride]; | ||
map.refs[i].ref = refs[i]; | ||
} | ||
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map.count = count; | ||
addr = mmap(NULL, count * PAGE_SIZE, | ||
prot, flags | MAP_ANON | MAP_SHARED, -1, 0); | ||
if ( map.va == MAP_FAILED ) | ||
{ | ||
GTERROR(xgt->logger, "osdep_gnttab_grant_map: mmap failed"); | ||
munmap((void *)map.va, count * PAGE_SIZE); | ||
addr = MAP_FAILED; | ||
} | ||
map.va = addr; | ||
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map.notify.offset = 0; | ||
map.notify.action = 0; | ||
if ( notify_offset < PAGE_SIZE * count ) | ||
{ | ||
map.notify.offset = notify_offset; | ||
map.notify.action |= UNMAP_NOTIFY_CLEAR_BYTE; | ||
} | ||
if ( notify_port != -1 ) | ||
{ | ||
map.notify.event_channel_port = notify_port; | ||
map.notify.action |= UNMAP_NOTIFY_SEND_EVENT; | ||
} | ||
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rv = ioctl(fd, IOCTL_GNTDEV_MMAP_GRANT_REF, &map); | ||
if ( rv ) | ||
{ | ||
GTERROR(xgt->logger, | ||
"ioctl IOCTL_GNTDEV_MMAP_GRANT_REF failed: %d", rv); | ||
munmap(addr, count * PAGE_SIZE); | ||
addr = MAP_FAILED; | ||
} | ||
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free(map.refs); | ||
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return addr; | ||
} | ||
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int osdep_gnttab_unmap(xengnttab_handle *xgt, | ||
void *start_address, | ||
uint32_t count) | ||
{ | ||
int rc; | ||
if ( start_address == NULL ) | ||
{ | ||
errno = EINVAL; | ||
return -1; | ||
} | ||
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/* Next, unmap the memory. */ | ||
rc = munmap(start_address, count * PAGE_SIZE); | ||
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return rc; | ||
} | ||
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int osdep_gnttab_grant_copy(xengnttab_handle *xgt, | ||
uint32_t count, | ||
xengnttab_grant_copy_segment_t *segs) | ||
{ | ||
errno = ENOSYS; | ||
return -1; | ||
} | ||
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int osdep_gntshr_open(xengntshr_handle *xgs) | ||
{ | ||
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int fd = open(DEVXEN, O_RDWR); | ||
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if ( fd == -1 ) | ||
return -1; | ||
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xgs->fd = fd; | ||
return 0; | ||
} | ||
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int osdep_gntshr_close(xengntshr_handle *xgs) | ||
{ | ||
if ( xgs->fd == -1 ) | ||
return 0; | ||
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return close(xgs->fd); | ||
} | ||
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void *osdep_gntshr_share_pages(xengntshr_handle *xgs, | ||
uint32_t domid, int count, | ||
uint32_t *refs, int writable, | ||
uint32_t notify_offset, | ||
evtchn_port_t notify_port) | ||
{ | ||
int err; | ||
int fd = xgs->fd; | ||
void *area = NULL; | ||
struct ioctl_gntdev_alloc_grant_ref alloc; | ||
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alloc.gref_ids = malloc(count * sizeof(uint32_t)); | ||
if ( alloc.gref_ids == NULL ) | ||
return NULL; | ||
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alloc.domid = domid; | ||
alloc.flags = writable ? GNTDEV_ALLOC_FLAG_WRITABLE : 0; | ||
alloc.count = count; | ||
area = mmap(NULL, count * PAGE_SIZE, | ||
PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0); | ||
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if ( area == MAP_FAILED ) | ||
{ | ||
GTERROR(xgs->logger, "osdep_gnttab_grant_map: mmap failed"); | ||
area = MAP_FAILED; | ||
goto out; | ||
} | ||
alloc.va = area; | ||
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alloc.notify.offset = 0; | ||
alloc.notify.action = 0; | ||
if ( notify_offset < PAGE_SIZE * count ) | ||
{ | ||
alloc.notify.offset = notify_offset; | ||
alloc.notify.action |= UNMAP_NOTIFY_CLEAR_BYTE; | ||
} | ||
if ( notify_port != -1 ) | ||
{ | ||
alloc.notify.event_channel_port = notify_port; | ||
alloc.notify.action |= UNMAP_NOTIFY_SEND_EVENT; | ||
} | ||
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err = ioctl(fd, IOCTL_GNTDEV_ALLOC_GRANT_REF, &alloc); | ||
if ( err ) | ||
{ | ||
GSERROR(xgs->logger, "IOCTL_GNTDEV_ALLOC_GRANT_REF failed"); | ||
munmap(area, count * PAGE_SIZE); | ||
area = MAP_FAILED; | ||
goto out; | ||
} | ||
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memcpy(refs, alloc.gref_ids, count * sizeof(uint32_t)); | ||
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out: | ||
free(alloc.gref_ids); | ||
return area; | ||
} | ||
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int osdep_gntshr_unshare(xengntshr_handle *xgs, | ||
void *start_address, uint32_t count) | ||
{ | ||
return munmap(start_address, count * PAGE_SIZE); | ||
} | ||
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/* | ||
* The functions below are Linux-isms that will likely never be implemented | ||
* on NetBSD unless NetBSD also implements something akin to Linux dmabuf. | ||
*/ | ||
int osdep_gnttab_dmabuf_exp_from_refs(xengnttab_handle *xgt, uint32_t domid, | ||
uint32_t flags, uint32_t count, | ||
const uint32_t *refs, | ||
uint32_t *dmabuf_fd) | ||
{ | ||
abort(); | ||
} | ||
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int osdep_gnttab_dmabuf_exp_wait_released(xengnttab_handle *xgt, | ||
uint32_t fd, uint32_t wait_to_ms) | ||
{ | ||
abort(); | ||
} | ||
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int osdep_gnttab_dmabuf_imp_to_refs(xengnttab_handle *xgt, uint32_t domid, | ||
uint32_t fd, uint32_t count, uint32_t *refs) | ||
{ | ||
abort(); | ||
} | ||
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int osdep_gnttab_dmabuf_imp_release(xengnttab_handle *xgt, uint32_t fd) | ||
{ | ||
abort(); | ||
} | ||
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/* | ||
* Local variables: | ||
* mode: C | ||
* c-file-style: "BSD" | ||
* c-basic-offset: 4 | ||
* tab-width: 4 | ||
* indent-tabs-mode: nil | ||
* End: | ||
*/ |