lkml.org 
[lkml]   [2010]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 06/24] lmb: Add find_lmb_area()
Date
It will try find area according with size/align in specified range (start, end).

Need use it find correct buffer for new lmb.reserved.region.

also make it more easy for x86 to use lmb.
x86 early_res is using find/reserve pattern instead of alloc.

find_lmb_area() will hohor goal

When we need temperary buff for range array etc for range work, if We are using
lmb_alloc(), We will need to add some post fix code for buffer that is used
by range array, because it is in the lmb.reserved already.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
include/linux/lmb.h | 4 ++
mm/lmb.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 85 insertions(+), 0 deletions(-)
diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index e14ea8d..05234bd 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -83,6 +83,10 @@ lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
lmb_size_pages(type, region_nr);
}

+u64 __find_lmb_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
+ u64 size, u64 align);
+u64 find_lmb_area(u64 start, u64 end, u64 size, u64 align);
+
#include <asm/lmb.h>

#endif /* __KERNEL__ */
diff --git a/mm/lmb.c b/mm/lmb.c
index 65b62dc..d5d5dc4 100644
--- a/mm/lmb.c
+++ b/mm/lmb.c
@@ -11,9 +11,13 @@
*/

#include <linux/kernel.h>
+#include <linux/types.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/lmb.h>
+#include <linux/bootmem.h>
+#include <linux/mm.h>
+#include <linux/range.h>

#define LMB_ALLOC_ANYWHERE 0

@@ -546,3 +550,80 @@ int lmb_find(struct lmb_property *res)
}
return -1;
}
+
+static int __init find_overlapped_early(u64 start, u64 end)
+{
+ int i;
+ struct lmb_property *r;
+
+ for (i = 0; i < lmb.reserved.cnt && lmb.reserved.region[i].size; i++) {
+ r = &lmb.reserved.region[i];
+ if (end > r->base && start < (r->base + r->size))
+ break;
+ }
+
+ return i;
+}
+
+/* Check for already reserved areas */
+static inline bool __init bad_addr(u64 *addrp, u64 size, u64 align)
+{
+ int i;
+ u64 addr = *addrp;
+ bool changed = false;
+ struct lmb_property *r;
+again:
+ i = find_overlapped_early(addr, addr + size);
+ r = &lmb.reserved.region[i];
+ if (i < lmb.reserved.cnt && r->size) {
+ *addrp = addr = round_up(r->base + r->size, align);
+ changed = true;
+ goto again;
+ }
+ return changed;
+}
+
+u64 __init __find_lmb_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
+ u64 size, u64 align)
+{
+ u64 addr, last;
+
+ addr = round_up(ei_start, align);
+ if (addr < start)
+ addr = round_up(start, align);
+ if (addr >= ei_last)
+ goto out;
+ while (bad_addr(&addr, size, align) && addr+size <= ei_last)
+ ;
+ last = addr + size;
+ if (last > ei_last)
+ goto out;
+ if (last > end)
+ goto out;
+
+ return addr;
+
+out:
+ return -1ULL;
+}
+
+/*
+ * Find a free area with specified alignment in a specific range.
+ */
+u64 __init find_lmb_area(u64 start, u64 end, u64 size, u64 align)
+{
+ int i;
+
+ for (i = 0; i < lmb.memory.cnt; i++) {
+ u64 ei_start = lmb.memory.region[i].base;
+ u64 ei_last = ei_start + lmb.memory.region[i].size;
+ u64 addr;
+
+ addr = __find_lmb_area(ei_start, ei_last, start, end,
+ size, align);
+
+ if (addr != -1ULL)
+ return addr;
+ }
+ return -1ULL;
+}
--
1.6.4.2


\
 
 \ /
  Last update: 2010-03-26 23:31    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site