From: Michael Ellerman <mpe@ellerman.id.au>
To: linuxppc-dev@ozlabs.org
Cc: mikey@neuling.org, benh@kernel.crashing.org,
stewart@linux.vnet.ibm.com, cyrilbur@gmail.com
Subject: [PATCH 2/4] powerpc: Add PPC_FEATURE2_HTM_NO_SUSPEND
Date: Thu, 12 Oct 2017 21:17:17 +1100 [thread overview]
Message-ID: <1507803439-12862-2-git-send-email-mpe@ellerman.id.au> (raw)
In-Reply-To: <1507803439-12862-1-git-send-email-mpe@ellerman.id.au>
Some CPUs can operate in a mode where TM (Transactional Memory) is
enabled but the suspended state of TM is disabled. In this mode
tsuspend does not enter suspended state, instead the transaction is
aborted. Similarly any other event that would lead to suspended state
instead aborts the transaction.
There is also an ABI change, in that in this mode processes are not
allowed to sigreturn with an MSR that would lead to suspended state,
Linux will instead return an error to the sigreturn syscall.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/include/uapi/asm/cputable.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/include/uapi/asm/cputable.h b/arch/powerpc/include/uapi/asm/cputable.h
index 4d877144f377..b3b64cba71ec 100644
--- a/arch/powerpc/include/uapi/asm/cputable.h
+++ b/arch/powerpc/include/uapi/asm/cputable.h
@@ -48,6 +48,7 @@
#define PPC_FEATURE2_HAS_IEEE128 0x00400000 /* VSX IEEE Binary Float 128-bit */
#define PPC_FEATURE2_DARN 0x00200000 /* darn random number insn */
#define PPC_FEATURE2_SCV 0x00100000 /* scv syscall */
+#define PPC_FEATURE2_HTM_NO_SUSPEND 0x00080000 /* TM w/out suspended state */
/*
* IMPORTANT!
--
2.7.4
next prev parent reply other threads:[~2017-10-12 10:17 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-12 10:17 [PATCH 1/4] powerpc/tm: Add commandline option to disable hardware transactional memory Michael Ellerman
2017-10-12 10:17 ` Michael Ellerman [this message]
2017-10-12 10:17 ` [PATCH 3/4] powerpc/powernv: Enable TM without suspend if possible Michael Ellerman
2017-10-19 10:07 ` Florian Weimer
2017-10-19 12:04 ` Tulio Magno Quites Machado Filho
2017-10-19 12:45 ` Florian Weimer
2017-10-19 13:34 ` Tulio Magno Quites Machado Filho
2017-10-19 15:13 ` Adhemerval Zanella
2017-10-22 9:59 ` Michael Ellerman
2017-10-20 2:47 ` Michael Neuling
2017-10-22 9:48 ` Michael Ellerman
2017-10-22 9:54 ` Michael Ellerman
2017-10-12 10:17 ` [PATCH 4/4] powerpc/tm: P9 disable transactionally suspended sigcontexts Michael Ellerman
2017-10-12 11:58 ` [PATCH 5/4] KVM: PPC: Tie KVM_CAP_PPC_HTM to the user-visible TM feature Michael Ellerman
2017-10-24 8:08 ` [5/4] " Michael Ellerman
2017-10-20 11:45 ` [PATCH 1/4] powerpc/tm: Add commandline option to disable hardware transactional memory Breno Leitao
2017-10-20 12:58 ` David Laight
2017-10-21 1:00 ` Michael Neuling
2017-10-23 9:01 ` David Laight
2017-10-23 9:15 ` Michael Neuling
2017-10-21 0:58 ` Michael Neuling
2017-10-23 12:56 ` Breno Leitao
2017-10-24 8:12 ` Michael Ellerman
2017-10-24 8:08 ` [1/4] " Michael Ellerman
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