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devobj: allow read only device file mappings (OFED 3.3 support)

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This commit is contained in:
Balazs Gerofi
2016-06-21 06:57:47 +09:00
parent d90900b6e6
commit a83ad620c8
4 changed files with 11 additions and 6 deletions
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4
kernel/devobj.c
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@@ -78,7 +78,8 @@ static struct memobj *to_memobj(struct devobj *devobj)
/***********************************************************************
* devobj
*/
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp)
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp,
int prot)
{
ihk_mc_user_context_t ctx;
struct pager_map_result result; // XXX: assumes contiguous physical
@@ -115,6 +116,7 @@ int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxp
ihk_mc_syscall_arg2(&ctx) = len;
ihk_mc_syscall_arg3(&ctx) = off;
ihk_mc_syscall_arg4(&ctx) = virt_to_phys(&result);
ihk_mc_syscall_arg5(&ctx) = prot;
error = syscall_generic_forwarding(__NR_mmap, &ctx);
if (error) {

3
kernel/include/memobj.h
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@@ -141,6 +141,7 @@ int fileobj_create(int fd, struct memobj **objp, int *maxprotp);
struct shmid_ds;
int shmobj_create(struct shmid_ds *ds, struct memobj **objp);
int zeroobj_create(struct memobj **objp);
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp);
int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxprotp,
int prot);
#endif /* HEADER_MEMOBJ_H */

2
kernel/syscall.c
View File

@@ -1108,7 +1108,7 @@ do_mmap(const intptr_t addr0, const size_t len0, const int prot,
vrflags &= ~VR_MEMTYPE_MASK;
vrflags |= VR_MEMTYPE_UC;
}
error = devobj_create(fd, len, off, &memobj, &maxprot);
error = devobj_create(fd, len, off, &memobj, &maxprot, prot);
}
if (error) {
ekprintf("do_mmap:fileobj_create failed. %d\n", error);