From: Wei Liu <wei.liu2@citrix.com>
To: xen-devel@lists.xen.org
Cc: Wei Liu <wei.liu2@citrix.com>,
ian.campbell@citrix.com, jbeulich@suse.com,
david.vrabel@citrix.com
Subject: [PATCH V2 06/15] Introduce some macros for event channels
Date: Mon, 4 Feb 2013 17:23:49 +0000 [thread overview]
Message-ID: <1359998638-16774-7-git-send-email-wei.liu2@citrix.com> (raw)
In-Reply-To: <1359998638-16774-1-git-send-email-wei.liu2@citrix.com>
For N-level event channels, the shared bitmaps in the hypervisor are by design
not guaranteed to be contigious.
These macros are used to calculate page number / offset within a page of a
given event channel.
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
xen/include/asm-arm/types.h | 7 +++++--
xen/include/asm-x86/config.h | 4 +++-
xen/include/xen/event.h | 13 +++++++++++++
3 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/xen/include/asm-arm/types.h b/xen/include/asm-arm/types.h
index 48864f9..65562b8 100644
--- a/xen/include/asm-arm/types.h
+++ b/xen/include/asm-arm/types.h
@@ -41,10 +41,13 @@ typedef char bool_t;
#define test_and_clear_bool(b) xchg(&(b), 0)
#endif /* __ASSEMBLY__ */
+#define BYTE_BITORDER 3
+#define BITS_PER_BYTE (1 << BYTE_BITORDER)
-#define BITS_PER_LONG 32
-#define BYTES_PER_LONG 4
+#define BITS_PER_LONG (1 << LONG_BITORDER)
#define LONG_BYTEORDER 2
+#define LONG_BITORDER (LONG_BYTEORDER + BYTE_BITORDER)
+#define BYTES_PER_LONG (1 << LONG_BYTEORDER)
#endif /* __ARM_TYPES_H__ */
/*
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index da82e73..b921586 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -8,11 +8,13 @@
#define __X86_CONFIG_H__
#define LONG_BYTEORDER 3
+#define BYTE_BITORDER 3
+#define LONG_BITORDER (BYTE_BITORDER + LONG_BYTEORDER)
#define CONFIG_PAGING_LEVELS 4
#define BYTES_PER_LONG (1 << LONG_BYTEORDER)
#define BITS_PER_LONG (BYTES_PER_LONG << 3)
-#define BITS_PER_BYTE 8
+#define BITS_PER_BYTE (1 << BYTE_BITORDER)
#define CONFIG_X86 1
#define CONFIG_X86_HT 1
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index 1021a1a..4474296 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -39,6 +39,19 @@
#define EVTCHNS_PER_BUCKET 512
#define NR_EVTCHN_BUCKETS (NR_EVENT_CHANNELS / EVTCHNS_PER_BUCKET)
+/* N.B. EVTCHNS_PER_PAGE is always powers of 2, use shifts to optimize */
+#define EVTCHNS_SHIFT (PAGE_SHIFT+BYTE_BITORDER)
+#define EVTCHNS_PER_PAGE (_AC(1,L) << EVTCHNS_SHIFT)
+#define EVTCHN_MASK (~(EVTCHNS_PER_PAGE-1))
+#define EVTCHN_PAGE_NO(chn) ((chn) >> EVTCHNS_SHIFT)
+#define EVTCHN_OFFSET_IN_PAGE(chn) ((chn) & ~EVTCHN_MASK)
+
+#ifndef CONFIG_COMPAT
+#define EVTCHN_WORD_BITORDER(d) LONG_BITORDER
+#else
+#define EVTCHN_WORD_BITORDER(d) (has_32bit_shinfo(d) ? 5 : LONG_BITORDER)
+#endif
+
struct evtchn
{
#define ECS_FREE 0 /* Channel is available for use. */
--
1.7.10.4
next prev parent reply other threads:[~2013-02-04 17:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-04 17:23 [PATCH V2] Implement 3-level event channel in Xen Wei Liu
2013-02-04 17:23 ` [PATCH V2 01/15] Dynamically allocate d->evtchn Wei Liu
2013-02-04 17:23 ` [PATCH V2 02/15] Move event channel macros / struct definition to proper place Wei Liu
2013-02-04 17:23 ` [PATCH V2 03/15] Add evtchn_level in struct domain Wei Liu
2013-02-04 17:23 ` [PATCH V2 04/15] Bump EVTCHNS_PER_BUCKET to 512 Wei Liu
2013-02-04 17:23 ` [PATCH V2 05/15] Add evtchn_is_{pending, masked} and evtchn_clear_pending Wei Liu
2013-02-04 17:23 ` Wei Liu [this message]
2013-02-04 17:23 ` [PATCH V2 07/15] Update Xen public header Wei Liu
2013-02-04 17:23 ` [PATCH V2 08/15] Define N-level event channel registration interface Wei Liu
2013-02-04 17:23 ` [PATCH V2 09/15] Add control structures for 3-level event channel Wei Liu
2013-02-04 17:23 ` [PATCH V2 10/15] Make NR_EVTCHN_BUCKETS 3-level ready Wei Liu
2013-02-04 17:23 ` [PATCH V2 11/15] Genneralized event channel operations Wei Liu
2013-02-04 17:23 ` [PATCH V2 12/15] Infrastructure for manipulating 3-level event channel pages Wei Liu
2013-02-04 17:23 ` [PATCH V2 13/15] Implement 3-level event channel routines Wei Liu
2013-02-04 17:23 ` [PATCH V2 14/15] Only allow 3-level event channel on Dom0 and driver domain Wei Liu
2013-02-06 8:28 ` Jan Beulich
2013-02-04 17:23 ` [PATCH V2 15/15] libxl: add evtchn_l3 flag Wei Liu
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