Author: avg
Date: Mon Jun 15 13:43:23 2015
New Revision: 284416
URL: https://svnweb.freebsd.org/changeset/base/284416
Log:
ttm_vm_page_alloc: use vm_page_alloc for pages without dma32 restriction
This change re-organizes code a little bit to extract common pieces
of ttm_alloc_new_pages() and ttm_get_pages() into dedicated functions.
Also, for requests without address restrictions regular vm_page_alloc()
is used.
Lastly, when vm_page_alloc_contig() fails we call VM_WAIT before calling
vm_pageout_grow_cache() to ensure that there is enough free pages at all.
Reviewed by: kib
MFC after: 15 days
Modified:
head/sys/dev/drm2/ttm/ttm_page_alloc.c
Modified: head/sys/dev/drm2/ttm/ttm_page_alloc.c
==============================================================================
--- head/sys/dev/drm2/ttm/ttm_page_alloc.c Mon Jun 15 13:27:57 2015
(r284415)
+++ head/sys/dev/drm2/ttm/ttm_page_alloc.c Mon Jun 15 13:43:23 2015
(r284416)
@@ -155,6 +155,66 @@ ttm_caching_state_to_vm(enum ttm_caching
panic("caching state %d\n", cstate);
}
+static vm_page_t
+ttm_vm_page_alloc_dma32(int req, vm_memattr_t memattr)
+{
+ vm_page_t p;
+ int tries;
+
+ for (tries = 0; ; tries++) {
+ p = vm_page_alloc_contig(NULL, 0, req, 1, 0, 0xffffffff,
+ PAGE_SIZE, 0, memattr);
+ if (p != NULL || tries > 2)
+ return (p);
+
+ /*
+ * Before growing the cache see if this is just a normal
+ * memory shortage.
+ */
+ VM_WAIT;
+ vm_pageout_grow_cache(tries, 0, 0xffffffff);
+ }
+}
+
+static vm_page_t
+ttm_vm_page_alloc_any(int req, vm_memattr_t memattr)
+{
+ vm_page_t p;
+
+ while (1) {
+ p = vm_page_alloc(NULL, 0, req);
+ if (p != NULL)
+ break;
+ VM_WAIT;
+ }
+ pmap_page_set_memattr(p, memattr);
+ return (p);
+}
+
+static vm_page_t
+ttm_vm_page_alloc(int flags, enum ttm_caching_state cstate)
+{
+ vm_page_t p;
+ vm_memattr_t memattr;
+ int req;
+
+ memattr = ttm_caching_state_to_vm(cstate);
+ req = VM_ALLOC_NORMAL | VM_ALLOC_WIRED | VM_ALLOC_NOOBJ;
+ if ((flags & TTM_PAGE_FLAG_ZERO_ALLOC) != 0)
+ req |= VM_ALLOC_ZERO;
+
+ if ((flags & TTM_PAGE_FLAG_DMA32) != 0)
+ p = ttm_vm_page_alloc_dma32(req, memattr);
+ else
+ p = ttm_vm_page_alloc_any(req, memattr);
+
+ if (p != NULL) {
+ p->oflags &= ~VPO_UNMANAGED;
+ p->flags |= PG_FICTITIOUS;
+ }
+ return (p);
+}
+
static void ttm_pool_kobj_release(struct ttm_pool_manager *m)
{
@@ -461,14 +521,6 @@ static void ttm_handle_caching_state_fai
}
}
-static vm_paddr_t
-ttm_alloc_high_bound(int ttm_alloc_flags)
-{
-
- return ((ttm_alloc_flags & TTM_PAGE_FLAG_DMA32) ? 0xffffffff :
- VM_MAX_ADDRESS);
-}
-
/**
* Allocate new pages with correct caching.
*
@@ -481,32 +533,17 @@ static int ttm_alloc_new_pages(struct pg
vm_page_t *caching_array;
vm_page_t p;
int r = 0;
- unsigned i, cpages, aflags;
+ unsigned i, cpages;
unsigned max_cpages = min(count,
(unsigned)(PAGE_SIZE/sizeof(vm_page_t)));
- int tries;
- aflags = VM_ALLOC_NORMAL | VM_ALLOC_WIRED | VM_ALLOC_NOOBJ |
- ((ttm_alloc_flags & TTM_PAGE_FLAG_ZERO_ALLOC) != 0 ?
- VM_ALLOC_ZERO : 0);
-
/* allocate array for page caching change */
caching_array = malloc(max_cpages * sizeof(vm_page_t), M_TEMP,
M_WAITOK | M_ZERO);
for (i = 0, cpages = 0; i < count; ++i) {
- tries = 0;
-retry:
- p = vm_page_alloc_contig(NULL, 0, aflags, 1, 0,
- ttm_alloc_high_bound(ttm_alloc_flags),
- PAGE_SIZE, 0, ttm_caching_state_to_vm(cstate));
+ p = ttm_vm_page_alloc(ttm_alloc_flags, cstate);
if (!p) {
- if (tries < 3) {
- vm_pageout_grow_cache(tries, 0,
- ttm_alloc_high_bound(ttm_alloc_flags));
- tries++;
- goto retry;
- }
printf("[TTM] Unable to get page %u\n", i);
/* store already allocated pages in the pool after
@@ -522,8 +559,6 @@ retry:
r = -ENOMEM;
goto out;
}
- p->oflags &= ~VPO_UNMANAGED;
- p->flags |= PG_FICTITIOUS;
#ifdef CONFIG_HIGHMEM /* KIB: nop */
/* gfp flags of highmem page should never be dma32 so we
@@ -705,34 +740,18 @@ static int ttm_get_pages(vm_page_t *page
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct pglist plist;
vm_page_t p = NULL;
- int gfp_flags, aflags;
+ int gfp_flags;
unsigned count;
int r;
- int tries;
-
- aflags = VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED |
- ((flags & TTM_PAGE_FLAG_ZERO_ALLOC) != 0 ? VM_ALLOC_ZERO : 0);
/* No pool for cached pages */
if (pool == NULL) {
for (r = 0; r < npages; ++r) {
- tries = 0;
-retry:
- p = vm_page_alloc_contig(NULL, 0, aflags, 1, 0,
- ttm_alloc_high_bound(flags), PAGE_SIZE,
- 0, ttm_caching_state_to_vm(cstate));
+ p = ttm_vm_page_alloc(flags, cstate);
if (!p) {
- if (tries < 3) {
- vm_pageout_grow_cache(tries, 0,
- ttm_alloc_high_bound(flags));
- tries++;
- goto retry;
- }
printf("[TTM] Unable to allocate page\n");
return -ENOMEM;
}
- p->oflags &= ~VPO_UNMANAGED;
- p->flags |= PG_FICTITIOUS;
pages[r] = p;
}
return 0;
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