svn commit: r238452 - head/sys/vm
Alan Cox
alc at FreeBSD.org
Sat Jul 14 18:10:45 UTC 2012
Author: alc
Date: Sat Jul 14 18:10:44 2012
New Revision: 238452
URL: http://svn.freebsd.org/changeset/base/238452
Log:
Move kmem_alloc_{attr,contig}() to vm/vm_kern.c, where similarly named
functions reside. Correct the comment describing kmem_alloc_contig().
Modified:
head/sys/vm/vm_contig.c
head/sys/vm/vm_kern.c
Modified: head/sys/vm/vm_contig.c
==============================================================================
--- head/sys/vm/vm_contig.c Sat Jul 14 16:34:17 2012 (r238451)
+++ head/sys/vm/vm_contig.c Sat Jul 14 18:10:44 2012 (r238452)
@@ -75,14 +75,11 @@ __FBSDID("$FreeBSD$");
#include <vm/vm.h>
#include <vm/vm_param.h>
-#include <vm/vm_kern.h>
#include <vm/pmap.h>
-#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
-#include <vm/vm_extern.h>
static int
vm_contig_launder_page(vm_page_t m, vm_page_t *next)
@@ -208,144 +205,3 @@ again:
}
vm_page_unlock_queues();
}
-
-/*
- * Allocates a region from the kernel address map and pages within the
- * specified physical address range to the kernel object, creates a wired
- * mapping from the region to these pages, and returns the region's starting
- * virtual address. The allocated pages are not necessarily physically
- * contiguous. If M_ZERO is specified through the given flags, then the pages
- * are zeroed before they are mapped.
- */
-vm_offset_t
-kmem_alloc_attr(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low,
- vm_paddr_t high, vm_memattr_t memattr)
-{
- vm_object_t object = kernel_object;
- vm_offset_t addr;
- vm_ooffset_t end_offset, offset;
- vm_page_t m;
- int pflags, tries;
-
- size = round_page(size);
- vm_map_lock(map);
- if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
- vm_map_unlock(map);
- return (0);
- }
- offset = addr - VM_MIN_KERNEL_ADDRESS;
- vm_object_reference(object);
- vm_map_insert(map, object, offset, addr, addr + size, VM_PROT_ALL,
- VM_PROT_ALL, 0);
- if ((flags & (M_NOWAIT | M_USE_RESERVE)) == M_NOWAIT)
- pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_NOBUSY;
- else
- pflags = VM_ALLOC_SYSTEM | VM_ALLOC_NOBUSY;
- if (flags & M_ZERO)
- pflags |= VM_ALLOC_ZERO;
- VM_OBJECT_LOCK(object);
- end_offset = offset + size;
- for (; offset < end_offset; offset += PAGE_SIZE) {
- tries = 0;
-retry:
- m = vm_page_alloc_contig(object, OFF_TO_IDX(offset), pflags, 1,
- low, high, PAGE_SIZE, 0, memattr);
- if (m == NULL) {
- VM_OBJECT_UNLOCK(object);
- if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) {
- vm_map_unlock(map);
- vm_contig_grow_cache(tries, low, high);
- vm_map_lock(map);
- VM_OBJECT_LOCK(object);
- tries++;
- goto retry;
- }
- /*
- * Since the pages that were allocated by any previous
- * iterations of this loop are not busy, they can be
- * freed by vm_object_page_remove(), which is called
- * by vm_map_delete().
- */
- vm_map_delete(map, addr, addr + size);
- vm_map_unlock(map);
- return (0);
- }
- if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
- pmap_zero_page(m);
- m->valid = VM_PAGE_BITS_ALL;
- }
- VM_OBJECT_UNLOCK(object);
- vm_map_unlock(map);
- vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM |
- VM_MAP_WIRE_NOHOLES);
- return (addr);
-}
-
-/*
- * Allocates a region from the kernel address map, inserts the
- * given physically contiguous pages into the kernel object,
- * creates a wired mapping from the region to the pages, and
- * returns the region's starting virtual address. If M_ZERO is
- * specified through the given flags, then the pages are zeroed
- * before they are mapped.
- */
-vm_offset_t
-kmem_alloc_contig(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low,
- vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
- vm_memattr_t memattr)
-{
- vm_object_t object = kernel_object;
- vm_offset_t addr;
- vm_ooffset_t offset;
- vm_page_t end_m, m;
- int pflags, tries;
-
- size = round_page(size);
- vm_map_lock(map);
- if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
- vm_map_unlock(map);
- return (0);
- }
- offset = addr - VM_MIN_KERNEL_ADDRESS;
- vm_object_reference(object);
- vm_map_insert(map, object, offset, addr, addr + size, VM_PROT_ALL,
- VM_PROT_ALL, 0);
- if ((flags & (M_NOWAIT | M_USE_RESERVE)) == M_NOWAIT)
- pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_NOBUSY;
- else
- pflags = VM_ALLOC_SYSTEM | VM_ALLOC_NOBUSY;
- if (flags & M_ZERO)
- pflags |= VM_ALLOC_ZERO;
- if (flags & M_NODUMP)
- pflags |= VM_ALLOC_NODUMP;
- VM_OBJECT_LOCK(object);
- tries = 0;
-retry:
- m = vm_page_alloc_contig(object, OFF_TO_IDX(offset), pflags,
- atop(size), low, high, alignment, boundary, memattr);
- if (m == NULL) {
- VM_OBJECT_UNLOCK(object);
- if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) {
- vm_map_unlock(map);
- vm_contig_grow_cache(tries, low, high);
- vm_map_lock(map);
- VM_OBJECT_LOCK(object);
- tries++;
- goto retry;
- }
- vm_map_delete(map, addr, addr + size);
- vm_map_unlock(map);
- return (0);
- }
- end_m = m + atop(size);
- for (; m < end_m; m++) {
- if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
- pmap_zero_page(m);
- m->valid = VM_PAGE_BITS_ALL;
- }
- VM_OBJECT_UNLOCK(object);
- vm_map_unlock(map);
- vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM |
- VM_MAP_WIRE_NOHOLES);
- return (addr);
-}
Modified: head/sys/vm/vm_kern.c
==============================================================================
--- head/sys/vm/vm_kern.c Sat Jul 14 16:34:17 2012 (r238451)
+++ head/sys/vm/vm_kern.c Sat Jul 14 18:10:44 2012 (r238452)
@@ -195,6 +195,148 @@ kmem_alloc(map, size)
}
/*
+ * Allocates a region from the kernel address map and physical pages
+ * within the specified address range to the kernel object. Creates a
+ * wired mapping from this region to these pages, and returns the
+ * region's starting virtual address. The allocated pages are not
+ * necessarily physically contiguous. If M_ZERO is specified through the
+ * given flags, then the pages are zeroed before they are mapped.
+ */
+vm_offset_t
+kmem_alloc_attr(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low,
+ vm_paddr_t high, vm_memattr_t memattr)
+{
+ vm_object_t object = kernel_object;
+ vm_offset_t addr;
+ vm_ooffset_t end_offset, offset;
+ vm_page_t m;
+ int pflags, tries;
+
+ size = round_page(size);
+ vm_map_lock(map);
+ if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
+ vm_map_unlock(map);
+ return (0);
+ }
+ offset = addr - VM_MIN_KERNEL_ADDRESS;
+ vm_object_reference(object);
+ vm_map_insert(map, object, offset, addr, addr + size, VM_PROT_ALL,
+ VM_PROT_ALL, 0);
+ if ((flags & (M_NOWAIT | M_USE_RESERVE)) == M_NOWAIT)
+ pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_NOBUSY;
+ else
+ pflags = VM_ALLOC_SYSTEM | VM_ALLOC_NOBUSY;
+ if (flags & M_ZERO)
+ pflags |= VM_ALLOC_ZERO;
+ VM_OBJECT_LOCK(object);
+ end_offset = offset + size;
+ for (; offset < end_offset; offset += PAGE_SIZE) {
+ tries = 0;
+retry:
+ m = vm_page_alloc_contig(object, OFF_TO_IDX(offset), pflags, 1,
+ low, high, PAGE_SIZE, 0, memattr);
+ if (m == NULL) {
+ VM_OBJECT_UNLOCK(object);
+ if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) {
+ vm_map_unlock(map);
+ vm_contig_grow_cache(tries, low, high);
+ vm_map_lock(map);
+ VM_OBJECT_LOCK(object);
+ tries++;
+ goto retry;
+ }
+
+ /*
+ * Since the pages that were allocated by any previous
+ * iterations of this loop are not busy, they can be
+ * freed by vm_object_page_remove(), which is called
+ * by vm_map_delete().
+ */
+ vm_map_delete(map, addr, addr + size);
+ vm_map_unlock(map);
+ return (0);
+ }
+ if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
+ pmap_zero_page(m);
+ m->valid = VM_PAGE_BITS_ALL;
+ }
+ VM_OBJECT_UNLOCK(object);
+ vm_map_unlock(map);
+ vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM |
+ VM_MAP_WIRE_NOHOLES);
+ return (addr);
+}
+
+/*
+ * Allocates a region from the kernel address map and physically
+ * contiguous pages within the specified address range to the kernel
+ * object. Creates a wired mapping from this region to these pages, and
+ * returns the region's starting virtual address. If M_ZERO is specified
+ * through the given flags, then the pages are zeroed before they are
+ * mapped.
+ */
+vm_offset_t
+kmem_alloc_contig(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low,
+ vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
+ vm_memattr_t memattr)
+{
+ vm_object_t object = kernel_object;
+ vm_offset_t addr;
+ vm_ooffset_t offset;
+ vm_page_t end_m, m;
+ int pflags, tries;
+
+ size = round_page(size);
+ vm_map_lock(map);
+ if (vm_map_findspace(map, vm_map_min(map), size, &addr)) {
+ vm_map_unlock(map);
+ return (0);
+ }
+ offset = addr - VM_MIN_KERNEL_ADDRESS;
+ vm_object_reference(object);
+ vm_map_insert(map, object, offset, addr, addr + size, VM_PROT_ALL,
+ VM_PROT_ALL, 0);
+ if ((flags & (M_NOWAIT | M_USE_RESERVE)) == M_NOWAIT)
+ pflags = VM_ALLOC_INTERRUPT | VM_ALLOC_NOBUSY;
+ else
+ pflags = VM_ALLOC_SYSTEM | VM_ALLOC_NOBUSY;
+ if (flags & M_ZERO)
+ pflags |= VM_ALLOC_ZERO;
+ if (flags & M_NODUMP)
+ pflags |= VM_ALLOC_NODUMP;
+ VM_OBJECT_LOCK(object);
+ tries = 0;
+retry:
+ m = vm_page_alloc_contig(object, OFF_TO_IDX(offset), pflags,
+ atop(size), low, high, alignment, boundary, memattr);
+ if (m == NULL) {
+ VM_OBJECT_UNLOCK(object);
+ if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) {
+ vm_map_unlock(map);
+ vm_contig_grow_cache(tries, low, high);
+ vm_map_lock(map);
+ VM_OBJECT_LOCK(object);
+ tries++;
+ goto retry;
+ }
+ vm_map_delete(map, addr, addr + size);
+ vm_map_unlock(map);
+ return (0);
+ }
+ end_m = m + atop(size);
+ for (; m < end_m; m++) {
+ if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0)
+ pmap_zero_page(m);
+ m->valid = VM_PAGE_BITS_ALL;
+ }
+ VM_OBJECT_UNLOCK(object);
+ vm_map_unlock(map);
+ vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM |
+ VM_MAP_WIRE_NOHOLES);
+ return (addr);
+}
+
+/*
* kmem_free:
*
* Release a region of kernel virtual memory allocated
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