From: vijay.kilari@gmail.com
To: Ian.Campbell@citrix.com, julien.grall@citrix.com,
stefano.stabellini@eu.citrix.com, stefano.stabellini@citrix.com,
tim@xen.org, xen-devel@lists.xen.org
Cc: Prasun.Kapoor@caviumnetworks.com,
Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>,
manish.jaggi@caviumnetworks.com, vijay.kilari@gmail.com
Subject: [RFC PATCH v3 01/18] xen/arm: Add bitmap_find_next_zero_area helper function
Date: Mon, 22 Jun 2015 17:31:40 +0530 [thread overview]
Message-ID: <1434974517-12136-2-git-send-email-vijay.kilari@gmail.com> (raw)
In-Reply-To: <1434974517-12136-1-git-send-email-vijay.kilari@gmail.com>
From: Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>
bitmap_find_next_zero_area helper function will be used
by physical ITS driver imported from linux
Signed-off-by: Vijaya Kumar K <Vijaya.Kumar@caviumnetworks.com>
---
v3: Moved changes to xen/common/bitmap.c and
xen/include/xen/bitmap.h
---
xen/common/bitmap.c | 39 +++++++++++++++++++++++++++++++++++++++
xen/include/xen/bitmap.h | 5 +++++
2 files changed, 44 insertions(+)
diff --git a/xen/common/bitmap.c b/xen/common/bitmap.c
index 61d1ea4..ba060b2 100644
--- a/xen/common/bitmap.c
+++ b/xen/common/bitmap.c
@@ -489,6 +489,45 @@ int bitmap_allocate_region(unsigned long *bitmap, int pos, int order)
}
EXPORT_SYMBOL(bitmap_allocate_region);
+/*
+ * bitmap_find_next_zero_area - find a contiguous aligned zero area
+ * @map: The address to base the search on
+ * @size: The bitmap size in bits
+ * @start: The bitnumber to start searching at
+ * @nr: The number of zeroed bits we're looking for
+ * @align_mask: Alignment mask for zero area
+ *
+ * The @align_mask should be one less than a power of 2; the effect is that
+ * the bit offset of all zero areas this function finds is multiples of that
+ * power of 2. A @align_mask of 0 means no alignment is required.
+ */
+#define ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
+
+unsigned long bitmap_find_next_zero_area(unsigned long *map,
+ unsigned long size,
+ unsigned long start,
+ unsigned int nr,
+ unsigned long align_mask)
+{
+ unsigned long index, end, i;
+again:
+ index = find_next_zero_bit(map, size, start);
+
+ /* Align allocation */
+ index = ALIGN_MASK(index, align_mask);
+
+ end = index + nr;
+ if (end > size)
+ return end;
+ i = find_next_bit(map, end, index);
+ if (i < end) {
+ start = i + 1;
+ goto again;
+ }
+ return index;
+}
+EXPORT_SYMBOL(bitmap_find_next_zero_area);
+
#ifdef __BIG_ENDIAN
void bitmap_long_to_byte(uint8_t *bp, const unsigned long *lp, int nbits)
diff --git a/xen/include/xen/bitmap.h b/xen/include/xen/bitmap.h
index e2a3686..5c48ac3 100644
--- a/xen/include/xen/bitmap.h
+++ b/xen/include/xen/bitmap.h
@@ -101,6 +101,11 @@ extern int bitmap_scnlistprintf(char *buf, unsigned int len,
extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
+extern unsigned long bitmap_find_next_zero_area(unsigned long *map,
+ unsigned long size,
+ unsigned long start,
+ unsigned int nr,
+ unsigned long align_mask);
#define BITMAP_LAST_WORD_MASK(nbits) \
( \
--
1.7.9.5
next prev parent reply other threads:[~2015-06-22 12:01 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-22 12:01 [RFC PATCH v3 00/18] Add ITS support vijay.kilari
2015-06-22 12:01 ` vijay.kilari [this message]
2015-06-22 14:14 ` [RFC PATCH v3 01/18] xen/arm: Add bitmap_find_next_zero_area helper function Julien Grall
2015-06-22 12:01 ` [RFC PATCH v3 02/18] xen: Add log2 functionality vijay.kilari
2015-06-22 13:17 ` Jan Beulich
2015-06-24 13:05 ` Vijay Kilari
2015-06-24 13:21 ` Jan Beulich
2015-06-22 12:01 ` [RFC PATCH v3 03/18] xen: console: Add ratelimit support for error message vijay.kilari
2015-06-22 13:21 ` Jan Beulich
2015-06-25 13:14 ` Vijay Kilari
2015-06-25 13:21 ` Andrew Cooper
2015-06-25 13:31 ` Jan Beulich
2015-06-22 12:01 ` [RFC PATCH v3 04/18] xen/arm: gicv3: Refactor redistributor information vijay.kilari
2015-06-22 15:00 ` Julien Grall
2015-06-29 11:09 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 05/18] xen/arm: ITS: Port ITS driver to xen vijay.kilari
2015-06-22 17:16 ` Julien Grall
2015-06-26 9:19 ` Vijay Kilari
2015-06-26 9:52 ` Julien Grall
2015-06-29 11:39 ` Ian Campbell
2015-06-29 15:43 ` Vijay Kilari
2015-06-29 15:47 ` Vijay Kilari
2015-06-29 16:49 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 06/18] xen/arm: ITS: Add helper functions to manage its_devices vijay.kilari
2015-06-23 10:21 ` Julien Grall
2015-06-22 12:01 ` [RFC PATCH v3 07/18] xen/arm: ITS: implement hw_irq_controller for LPIs vijay.kilari
2015-06-23 14:32 ` Julien Grall
2015-06-26 12:54 ` Vijay Kilari
2015-06-26 15:05 ` Julien Grall
2015-06-29 11:53 ` Ian Campbell
2015-06-29 12:46 ` Julien Grall
2015-07-02 12:15 ` Vijay Kilari
2015-06-26 14:25 ` Vijay Kilari
2015-06-26 15:15 ` Julien Grall
2015-06-29 11:59 ` Ian Campbell
2015-07-02 12:21 ` Vijay Kilari
2015-07-02 12:35 ` Ian Campbell
2015-07-02 12:44 ` Vijay Kilari
2015-07-02 12:59 ` Ian Campbell
2015-07-02 16:11 ` Julien Grall
2015-06-22 12:01 ` [RFC PATCH v3 08/18] xen/arm: vITS: Add virtual ITS driver vijay.kilari
2015-06-23 16:39 ` Julien Grall
2015-07-02 13:33 ` Vijay Kilari
2015-07-02 14:30 ` Ian Campbell
2015-06-24 9:20 ` Julien Grall
2015-06-29 12:13 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 09/18] xen/arm: ITS: Add virtual ITS commands support vijay.kilari
2015-06-24 10:29 ` Julien Grall
2015-06-29 12:16 ` Ian Campbell
2015-06-29 12:18 ` Ian Campbell
2015-06-29 12:23 ` Ian Campbell
2015-07-03 6:50 ` Vijay Kilari
2015-07-03 8:41 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 10/18] xen/arm: ITS: Add APIs to add and assign device vijay.kilari
2015-06-24 11:38 ` Julien Grall
2015-06-29 12:25 ` Ian Campbell
2015-06-29 12:29 ` Ian Campbell
2015-07-02 8:40 ` Vijay Kilari
2015-07-02 9:01 ` Ian Campbell
2015-07-02 10:30 ` Julien Grall
2015-06-22 12:01 ` [RFC PATCH v3 11/18] xen/arm: ITS: Add GITS registers emulation vijay.kilari
2015-06-26 12:51 ` Julien Grall
2015-07-08 12:11 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 12/18] xen/arm: ITS: Add GICR register emulation vijay.kilari
2015-06-22 12:01 ` [RFC PATCH v3 13/18] xen/arm: ITS: Add irq descriptors for LPIs vijay.kilari
2015-06-29 12:58 ` Ian Campbell
2015-06-29 13:11 ` Julien Grall
2015-07-07 11:00 ` Vijay Kilari
2015-07-07 11:16 ` Julien Grall
2015-07-07 15:50 ` Ian Campbell
2015-07-07 15:52 ` Julien Grall
2015-07-07 16:04 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 14/18] xen/arm: ITS: Initialize physical ITS vijay.kilari
2015-06-22 12:01 ` [RFC PATCH v3 15/18] xen/arm: ITS: Add domain specific ITS initialization vijay.kilari
2015-06-29 13:01 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 16/18] xen/arm: ITS: Handle LPI interrupts vijay.kilari
2015-06-29 13:03 ` Ian Campbell
2015-06-22 12:01 ` [RFC PATCH v3 17/18] xen/arm: ITS: Generate ITS node for Dom0 vijay.kilari
2015-06-29 13:06 ` Ian Campbell
2015-07-07 5:31 ` Vijay Kilari
2015-07-07 8:21 ` Julien Grall
2015-07-07 10:25 ` Vijay Kilari
2015-07-07 11:07 ` Julien Grall
2015-06-22 12:01 ` [RFC PATCH v3 18/18] xen/arm: ITS: Map ITS translation space vijay.kilari
2015-06-22 13:52 ` [RFC PATCH v3 00/18] Add ITS support Julien Grall
2015-06-22 13:56 ` Ian Campbell
2015-06-24 10:02 ` Ian Campbell
2015-06-29 13:11 ` Ian Campbell
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