[IA64] allocate multiple contiguous pages via uncached allocator
Dean Nelson [Fri, 25 Apr 2008 20:22:19 +0000 (15:22 -0500)]
Enable the uncached allocator to allocate multiple pages of contiguous
uncached memory.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/uncached.c
drivers/char/mspec.c
drivers/misc/sgi-xp/xpc_partition.c
include/asm-ia64/uncached.h

index 2a90c32..e77995a 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2001-2006 Silicon Graphics, Inc.  All rights reserved.
+ * Copyright (C) 2001-2008 Silicon Graphics, Inc.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License
@@ -177,12 +177,13 @@ failed:
  * uncached_alloc_page
  *
  * @starting_nid: node id of node to start with, or -1
+ * @n_pages: number of contiguous pages to allocate
  *
- * Allocate 1 uncached page. Allocates on the requested node. If no
- * uncached pages are available on the requested node, roundrobin starting
- * with the next higher node.
+ * Allocate the specified number of contiguous uncached pages on the
+ * the requested node. If not enough contiguous uncached pages are available
+ * on the requested node, roundrobin starting with the next higher node.
  */
-unsigned long uncached_alloc_page(int starting_nid)
+unsigned long uncached_alloc_page(int starting_nid, int n_pages)
 {
        unsigned long uc_addr;
        struct uncached_pool *uc_pool;
@@ -202,7 +203,8 @@ unsigned long uncached_alloc_page(int starting_nid)
                if (uc_pool->pool == NULL)
                        continue;
                do {
-                       uc_addr = gen_pool_alloc(uc_pool->pool, PAGE_SIZE);
+                       uc_addr = gen_pool_alloc(uc_pool->pool,
+                                                n_pages * PAGE_SIZE);
                        if (uc_addr != 0)
                                return uc_addr;
                } while (uncached_add_chunk(uc_pool, nid) == 0);
@@ -217,11 +219,12 @@ EXPORT_SYMBOL(uncached_alloc_page);
 /*
  * uncached_free_page
  *
- * @uc_addr: uncached address of page to free
+ * @uc_addr: uncached address of first page to free
+ * @n_pages: number of contiguous pages to free
  *
- * Free a single uncached page.
+ * Free the specified number of uncached pages.
  */
-void uncached_free_page(unsigned long uc_addr)
+void uncached_free_page(unsigned long uc_addr, int n_pages)
 {
        int nid = paddr_to_nid(uc_addr - __IA64_UNCACHED_OFFSET);
        struct gen_pool *pool = uncached_pools[nid].pool;
@@ -232,7 +235,7 @@ void uncached_free_page(unsigned long uc_addr)
        if ((uc_addr & (0XFUL << 60)) != __IA64_UNCACHED_OFFSET)
                panic("uncached_free_page invalid address %lx\n", uc_addr);
 
-       gen_pool_free(pool, uc_addr, PAGE_SIZE);
+       gen_pool_free(pool, uc_addr, n_pages * PAGE_SIZE);
 }
 EXPORT_SYMBOL(uncached_free_page);
 
index ff146c2..fe2a95b 100644 (file)
@@ -180,7 +180,7 @@ mspec_close(struct vm_area_struct *vma)
                my_page = vdata->maddr[index];
                vdata->maddr[index] = 0;
                if (!mspec_zero_block(my_page, PAGE_SIZE))
-                       uncached_free_page(my_page);
+                       uncached_free_page(my_page, 1);
                else
                        printk(KERN_WARNING "mspec_close(): "
                               "failed to zero page %ld\n", my_page);
@@ -209,7 +209,7 @@ mspec_nopfn(struct vm_area_struct *vma, unsigned long address)
        index = (address - vdata->vm_start) >> PAGE_SHIFT;
        maddr = (volatile unsigned long) vdata->maddr[index];
        if (maddr == 0) {
-               maddr = uncached_alloc_page(numa_node_id());
+               maddr = uncached_alloc_page(numa_node_id(), 1);
                if (maddr == 0)
                        return NOPFN_OOM;
 
@@ -218,7 +218,7 @@ mspec_nopfn(struct vm_area_struct *vma, unsigned long address)
                        vdata->count++;
                        vdata->maddr[index] = maddr;
                } else {
-                       uncached_free_page(maddr);
+                       uncached_free_page(maddr, 1);
                        maddr = vdata->maddr[index];
                }
                spin_unlock(&vdata->lock);
@@ -367,7 +367,7 @@ mspec_init(void)
                                int nasid;
                                unsigned long phys;
 
-                               scratch_page[nid] = uncached_alloc_page(nid);
+                               scratch_page[nid] = uncached_alloc_page(nid, 1);
                                if (scratch_page[nid] == 0)
                                        goto free_scratch_pages;
                                phys = __pa(scratch_page[nid]);
@@ -414,7 +414,7 @@ mspec_init(void)
  free_scratch_pages:
        for_each_node(nid) {
                if (scratch_page[nid] != 0)
-                       uncached_free_page(scratch_page[nid]);
+                       uncached_free_page(scratch_page[nid], 1);
        }
        return ret;
 }
@@ -431,7 +431,7 @@ mspec_exit(void)
 
                for_each_node(nid) {
                        if (scratch_page[nid] != 0)
-                               uncached_free_page(scratch_page[nid]);
+                               uncached_free_page(scratch_page[nid], 1);
                }
        }
 }
index 27e200e..acd3fd4 100644 (file)
@@ -211,7 +211,7 @@ xpc_rsvd_page_init(void)
         */
        amos_page = xpc_vars->amos_page;
        if (amos_page == NULL) {
-               amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0));
+               amos_page = (AMO_t *)TO_AMO(uncached_alloc_page(0, 1));
                if (amos_page == NULL) {
                        dev_err(xpc_part, "can't allocate page of AMOs\n");
                        return NULL;
@@ -230,7 +230,7 @@ xpc_rsvd_page_init(void)
                                dev_err(xpc_part, "can't change memory "
                                        "protections\n");
                                uncached_free_page(__IA64_UNCACHED_OFFSET |
-                                                  TO_PHYS((u64)amos_page));
+                                                  TO_PHYS((u64)amos_page), 1);
                                return NULL;
                        }
                }
index b82d923..13d7e65 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2001-2005 Silicon Graphics, Inc.  All rights reserved.
+ * Copyright (C) 2001-2008 Silicon Graphics, Inc.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of version 2 of the GNU General Public License
@@ -8,5 +8,5 @@
  * Prototypes for the uncached page allocator
  */
 
-extern unsigned long uncached_alloc_page(int nid);
-extern void uncached_free_page(unsigned long);
+extern unsigned long uncached_alloc_page(int starting_nid, int n_pages);
+extern void uncached_free_page(unsigned long uc_addr, int n_pages);