From: Julien Grall <julien.grall@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: tokamoto@jp.fujitsu.com, Anton.Kirilov@arm.com,
catalin.marinas@arm.com, will.deacon@arm.com, oleg@redhat.com,
Julien Grall <julien.grall@arm.com>,
alex.bennee@linaro.org, Dave.Martin@arm.com, Daniel.Kiss@arm.com
Subject: [RFC PATCH 4/8] arm64/fpsimdmacros: Introduce a macro to update ZCR_EL1.LEN
Date: Fri, 18 Jan 2019 16:46:06 +0000 [thread overview]
Message-ID: <20190118164610.8123-5-julien.grall@arm.com> (raw)
In-Reply-To: <20190118164610.8123-1-julien.grall@arm.com>
A follow-up patch will need to update ZCR_EL1.LEN.
Add a macro that could be re-used in the current and new place to avoid
code duplication.
Signed-off-by: Julien Grall <julien.grall@arm.com>
---
arch/arm64/include/asm/fpsimdmacros.h | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/include/asm/fpsimdmacros.h b/arch/arm64/include/asm/fpsimdmacros.h
index e2ab77dd9b4f..5e291d9c1ba0 100644
--- a/arch/arm64/include/asm/fpsimdmacros.h
+++ b/arch/arm64/include/asm/fpsimdmacros.h
@@ -198,6 +198,17 @@
.purgem _for__body
.endm
+/* Update ZCR_EL1.LEN with the new VQ */
+.macro sve_load_vq xvqminus1, xtmp, xtmp2
+ mrs_s \xtmp, SYS_ZCR_EL1
+ bic \xtmp2, \xtmp, ZCR_ELx_LEN_MASK
+ orr \xtmp2, \xtmp2, \xvqminus1
+ cmp \xtmp2, \xtmp
+ b.eq 921f
+ msr_s SYS_ZCR_EL1, \xtmp2 //self-synchronising
+921:
+.endm
+
.macro sve_save nxbase, xpfpsr, nxtmp
_for n, 0, 31, _sve_str_v \n, \nxbase, \n - 34
_for n, 0, 15, _sve_str_p \n, \nxbase, \n - 16
@@ -212,13 +223,7 @@
.endm
.macro sve_load nxbase, xpfpsr, xvqminus1, nxtmp, xtmp2
- mrs_s x\nxtmp, SYS_ZCR_EL1
- bic \xtmp2, x\nxtmp, ZCR_ELx_LEN_MASK
- orr \xtmp2, \xtmp2, \xvqminus1
- cmp \xtmp2, x\nxtmp
- b.eq 921f
- msr_s SYS_ZCR_EL1, \xtmp2 // self-synchronising
-921:
+ sve_load_vq \xvqminus1, x\nxtmp, \xtmp2
_for n, 0, 31, _sve_ldr_v \n, \nxbase, \n - 34
_sve_ldr_p 0, \nxbase
_sve_wrffr 0
--
2.11.0
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next prev parent reply other threads:[~2019-01-18 16:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-18 16:46 [RFC PATCH 0/8] arm64/sve: First steps towards optimizing syscalls Julien Grall
2019-01-18 16:46 ` [RFC PATCH 1/8] arm64/fpsimd: Update documentation of do_sve_acc Julien Grall
2019-01-21 12:13 ` Mark Rutland
2019-01-22 16:03 ` Julien Grall
2019-01-18 16:46 ` [RFC PATCH 2/8] arm64/signal: Update the comment in preserve_sve_context Julien Grall
2019-01-21 12:17 ` Mark Rutland
2019-01-18 16:46 ` [RFC PATCH 3/8] arm64/fpsimdmacros: Allow the macro "for" to be used in more cases Julien Grall
2019-01-18 16:46 ` Julien Grall [this message]
2019-01-18 16:46 ` [RFC PATCH 5/8] arm64/sve: Implement helper to flush SVE registers Julien Grall
2019-01-18 16:46 ` [RFC PATCH 6/8] arm64/sve: Implement helper to load SVE registers from FPSIMD state Julien Grall
2019-01-18 16:46 ` [RFC PATCH 7/8] arm64/sve: Don't disable SVE on syscalls return Julien Grall
2019-01-18 16:46 ` [RFC PATCH 8/8] arm64/sve: Rework SVE trap access to use TIF_SVE_NEEDS_FLUSH Julien Grall
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