From: Julien Grall <julien.grall@arm.com>
To: xen-devel@lists.xen.org
Cc: andre.przywara@arm.com, Julien Grall <julien.grall@arm.com>,
sstabellini@kernel.org, wei.chen@arm.com, steve.capper@arm.com
Subject: [PATCH v3 10/16] xen/arm: cpufeature: Provide an helper to check if a capability is supported
Date: Tue, 7 Jun 2016 17:06:17 +0100 [thread overview]
Message-ID: <1465315583-1278-11-git-send-email-julien.grall@arm.com> (raw)
In-Reply-To: <1465315583-1278-1-git-send-email-julien.grall@arm.com>
The CPU capabilities will be set depending on the value found in the CPU
registers. This patch provides a generic to go through a set of capabilities
and find which one should be enabled.
The parameter "info" is used to display the kind of capability updated (e.g
workaround, feature...).
Signed-off-by: Julien Grall <julien.grall@arm.com>
---
Changes in v3:
- Patch added. The code was previously part of "Detect
silicon...".
---
xen/arch/arm/cpufeature.c | 16 ++++++++++++++++
xen/include/asm-arm/cpufeature.h | 9 +++++++++
2 files changed, 25 insertions(+)
diff --git a/xen/arch/arm/cpufeature.c b/xen/arch/arm/cpufeature.c
index 7a1b56b..088625b 100644
--- a/xen/arch/arm/cpufeature.c
+++ b/xen/arch/arm/cpufeature.c
@@ -24,6 +24,22 @@
DECLARE_BITMAP(cpu_hwcaps, ARM_NCAPS);
+void update_cpu_capabilities(const struct arm_cpu_capabilities *caps,
+ const char *info)
+{
+ int i;
+
+ for ( i = 0; caps[i].matches; i++ )
+ {
+ if ( !caps[i].matches(&caps[i]) )
+ continue;
+
+ if ( !cpus_have_cap(caps[i].capability) && caps[i].desc )
+ printk(XENLOG_INFO "%s: %s\n", info, caps[i].desc);
+ cpus_set_cap(caps[i].capability);
+ }
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/include/asm-arm/cpufeature.h b/xen/include/asm-arm/cpufeature.h
index 2bebad1..be2414c 100644
--- a/xen/include/asm-arm/cpufeature.h
+++ b/xen/include/asm-arm/cpufeature.h
@@ -62,6 +62,15 @@ static inline void cpus_set_cap(unsigned int num)
__set_bit(num, cpu_hwcaps);
}
+struct arm_cpu_capabilities {
+ const char *desc;
+ u16 capability;
+ bool_t (*matches)(const struct arm_cpu_capabilities *);
+};
+
+void update_cpu_capabilities(const struct arm_cpu_capabilities *caps,
+ const char *info);
+
#endif /* __ASSEMBLY__ */
#endif
--
1.9.1
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next prev parent reply other threads:[~2016-06-07 16:06 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 16:06 [PATCH v3 00/16] xen/arm: Introduce alternative runtime patching for ARM64 Julien Grall
2016-06-07 16:06 ` [PATCH v3 01/16] xen/arm: Makefile: Sort the entries alphabetically Julien Grall
2016-06-07 16:06 ` [PATCH v3 02/16] xen/arm: Include the header asm-arm/system.h in asm-arm/page.h Julien Grall
2016-06-07 16:06 ` [PATCH v3 03/16] xen/arm: Add macros to handle the MIDR Julien Grall
2016-06-07 16:06 ` [PATCH v3 04/16] xen/arm: Add cpu_hwcap bitmap Julien Grall
2016-06-07 16:06 ` [PATCH v3 05/16] xen/arm64: Add an helper to invalidate all instruction caches Julien Grall
2016-06-07 16:06 ` [PATCH v3 06/16] xen/arm: arm64: Move the define BRK_BUG_FRAME into a separate header Julien Grall
2016-06-07 16:06 ` [PATCH v3 07/16] xen/arm: arm64: Reserve a brk immediate to fault on purpose Julien Grall
2016-06-07 16:06 ` [PATCH v3 08/16] xen/arm: arm64: Add helpers to decode and encode branch instructions Julien Grall
2016-06-07 16:06 ` [PATCH v3 09/16] xen/arm: Introduce alternative runtime patching Julien Grall
2016-06-07 17:24 ` Konrad Rzeszutek Wilk
2016-06-08 9:39 ` Julien Grall
2016-06-08 18:17 ` Konrad Rzeszutek Wilk
2016-06-08 18:22 ` Julien Grall
2016-06-08 18:35 ` Konrad Rzeszutek Wilk
2016-06-09 13:33 ` Julien Grall
2016-06-07 16:06 ` Julien Grall [this message]
2016-06-22 9:59 ` [PATCH v3 10/16] xen/arm: cpufeature: Provide an helper to check if a capability is supported Stefano Stabellini
2016-06-22 10:09 ` Julien Grall
2016-06-22 10:14 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 11/16] xen/arm: Detect silicon revision and set cap bits accordingly Julien Grall
2016-06-22 10:00 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 12/16] xen/arm: Document the errata implemented in Xen Julien Grall
2016-06-22 10:03 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 13/16] xen/arm: arm64: Add Cortex-A53 cache errata workaround Julien Grall
2016-06-22 10:04 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 14/16] xen/arm: arm64: Add cortex-A57 erratum 832075 workaround Julien Grall
2016-06-22 10:10 ` Stefano Stabellini
2016-06-07 16:06 ` [PATCH v3 15/16] xen/arm: traps: Don't inject a fault if the translation VA -> IPA fails Julien Grall
2016-06-07 16:06 ` [PATCH v3 16/16] xen/arm: arm64: Document Cortex-A57 erratum 834220 Julien Grall
2016-06-14 12:15 ` Julien Grall
2016-06-22 10:08 ` Stefano Stabellini
2016-06-22 10:18 ` Julien Grall
2016-06-22 10:37 ` Stefano Stabellini
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