From: Janosch Frank <frankja@linux.ibm.com>
To: kvm@vger.kernel.org
Cc: thuth@redhat.com, david@redhat.com, borntraeger@de.ibm.com,
imbrenda@linux.ibm.com, cohuck@redhat.com,
linux-s390@vger.kernel.org
Subject: [kvm-unit-tests PATCH v4 1/9] s390x: Add test_bit to library
Date: Tue, 12 Jan 2021 08:20:46 -0500 [thread overview]
Message-ID: <20210112132054.49756-2-frankja@linux.ibm.com> (raw)
In-Reply-To: <20210112132054.49756-1-frankja@linux.ibm.com>
Query/feature bits are commonly tested via MSB bit numbers on
s390. Let's add test bit functions, so we don't need to copy code to
test query bits.
The test_bit code has been taken from the kernel since most s390x KVM unit
test developers are used to them.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
---
lib/s390x/asm/bitops.h | 26 ++++++++++++++++++++++++++
lib/s390x/asm/facility.h | 3 ++-
s390x/uv-guest.c | 6 +++---
3 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/lib/s390x/asm/bitops.h b/lib/s390x/asm/bitops.h
index e7cdda9..792881e 100644
--- a/lib/s390x/asm/bitops.h
+++ b/lib/s390x/asm/bitops.h
@@ -1,3 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Bitops taken from the kernel as most developers are already used
+ * to them.
+ *
+ * Copyright IBM Corp. 1999,2013
+ *
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>,
+ *
+ */
#ifndef _ASMS390X_BITOPS_H_
#define _ASMS390X_BITOPS_H_
@@ -7,4 +17,20 @@
#define BITS_PER_LONG 64
+static inline bool test_bit(unsigned long nr,
+ const volatile unsigned long *ptr)
+{
+ const volatile unsigned char *addr;
+
+ addr = ((const volatile unsigned char *)ptr);
+ addr += (nr ^ (BITS_PER_LONG - 8)) >> 3;
+ return (*addr >> (nr & 7)) & 1;
+}
+
+static inline bool test_bit_inv(unsigned long nr,
+ const volatile unsigned long *ptr)
+{
+ return test_bit(nr ^ (BITS_PER_LONG - 1), ptr);
+}
+
#endif
diff --git a/lib/s390x/asm/facility.h b/lib/s390x/asm/facility.h
index 7828cf8..95d4a15 100644
--- a/lib/s390x/asm/facility.h
+++ b/lib/s390x/asm/facility.h
@@ -11,13 +11,14 @@
#include <libcflat.h>
#include <asm/facility.h>
#include <asm/arch_def.h>
+#include <bitops.h>
#define NB_STFL_DOUBLEWORDS 32
extern uint64_t stfl_doublewords[];
static inline bool test_facility(int nr)
{
- return stfl_doublewords[nr / 64] & (0x8000000000000000UL >> (nr % 64));
+ return test_bit_inv(nr, stfl_doublewords);
}
static inline void stfl(void)
diff --git a/s390x/uv-guest.c b/s390x/uv-guest.c
index bc947ab..e51b85e 100644
--- a/s390x/uv-guest.c
+++ b/s390x/uv-guest.c
@@ -75,11 +75,11 @@ static void test_query(void)
* Ultravisor version and are expected to always be available
* because they are basic building blocks.
*/
- report(uvcb.inst_calls_list[0] & (1UL << (63 - BIT_UVC_CMD_QUI)),
+ report(test_bit_inv(BIT_UVC_CMD_QUI, &uvcb.inst_calls_list[0]),
"query indicated");
- report(uvcb.inst_calls_list[0] & (1UL << (63 - BIT_UVC_CMD_SET_SHARED_ACCESS)),
+ report(test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, &uvcb.inst_calls_list[0]),
"share indicated");
- report(uvcb.inst_calls_list[0] & (1UL << (63 - BIT_UVC_CMD_REMOVE_SHARED_ACCESS)),
+ report(test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, &uvcb.inst_calls_list[0]),
"unshare indicated");
report_prefix_pop();
}
--
2.25.1
next prev parent reply other threads:[~2021-01-12 13:22 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-12 13:20 [kvm-unit-tests PATCH v4 0/9] s390x: Add SIE library and simple tests Janosch Frank
2021-01-12 13:20 ` Janosch Frank [this message]
2021-01-14 13:55 ` [kvm-unit-tests PATCH v4 1/9] s390x: Add test_bit to library Claudio Imbrenda
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 2/9] s390x: Consolidate sclp read info Janosch Frank
2021-01-14 13:57 ` Claudio Imbrenda
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 3/9] s390x: SCLP feature checking Janosch Frank
2021-01-13 11:02 ` Cornelia Huck
2021-01-14 13:47 ` Claudio Imbrenda
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 4/9] s390x: Split assembly into multiple files Janosch Frank
2021-01-13 11:04 ` Cornelia Huck
2021-01-13 12:04 ` Thomas Huth
2021-01-13 12:15 ` Janosch Frank
2021-01-14 8:54 ` Thomas Huth
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 5/9] s390x: sie: Add SIE to lib Janosch Frank
2021-01-13 12:44 ` Thomas Huth
2021-01-13 13:34 ` Janosch Frank
2021-01-14 14:43 ` Claudio Imbrenda
2021-01-14 15:03 ` Janosch Frank
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 6/9] s390x: sie: Add first SIE test Janosch Frank
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 7/9] s390x: Add diag318 intercept test Janosch Frank
2021-01-13 11:12 ` Cornelia Huck
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 8/9] s390x: Fix sclp.h style issues Janosch Frank
2021-01-12 13:20 ` [kvm-unit-tests PATCH v4 9/9] s390x: sclp: Add CPU entry offset comment Janosch Frank
2021-01-12 15:51 ` Thomas Huth
2021-01-13 10:25 ` David Hildenbrand
2021-01-13 11:06 ` Janosch Frank
2021-01-13 11:09 ` Cornelia Huck
2021-01-13 13:16 ` Thomas Huth
2021-01-14 14:45 ` Claudio Imbrenda
2021-01-18 9:43 ` [kvm-unit-tests PATCH v4 0/9] s390x: Add SIE library and simple tests Janosch Frank
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210112132054.49756-2-frankja@linux.ibm.com \
--to=frankja@linux.ibm.com \
--cc=borntraeger@de.ibm.com \
--cc=cohuck@redhat.com \
--cc=david@redhat.com \
--cc=imbrenda@linux.ibm.com \
--cc=kvm@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=thuth@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).