From: Alistair Popple <alistair@popple.id.au>
To: linuxppc-dev@lists.ozlabs.org
Cc: mikey@neuling.org, npiggin@gmail.com, aneesh.kumar@linux.ibm.com,
Alistair Popple <alistair@popple.id.au>
Subject: [PATCH v3 1/7] powerpc: Add new HWCAP bits
Date: Thu, 21 May 2020 11:43:35 +1000 [thread overview]
Message-ID: <20200521014341.29095-2-alistair@popple.id.au> (raw)
In-Reply-To: <20200521014341.29095-1-alistair@popple.id.au>
POWER10 introduces two new architectural features - ISAv3.1 and matrix
multiply assist (MMA) instructions. Userspace detects the presence
of these features via two HWCAP bits introduced in this patch. These
bits have been agreed to by the compiler and binutils team.
According to ISAv3.1 MMA is an optional feature and software that makes
use of it should first check for availability via this HWCAP bit and use
alternate code paths if unavailable.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
Tested-by: Michael Neuling <mikey@neuling.org>
---
arch/powerpc/include/uapi/asm/cputable.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/powerpc/include/uapi/asm/cputable.h b/arch/powerpc/include/uapi/asm/cputable.h
index 540592034740..731b97dc2d15 100644
--- a/arch/powerpc/include/uapi/asm/cputable.h
+++ b/arch/powerpc/include/uapi/asm/cputable.h
@@ -50,6 +50,8 @@
#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 */
+#define PPC_FEATURE2_ARCH_3_1 0x00040000 /* ISA 3.1 */
+#define PPC_FEATURE2_MMA 0x00020000 /* Matrix Multiply Assist */
/*
* IMPORTANT!
--
2.20.1
next prev parent reply other threads:[~2020-05-21 1:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 1:43 [PATCH v3 0/7] Base support for POWER10 Alistair Popple
2020-05-21 1:43 ` Alistair Popple [this message]
2020-05-21 1:43 ` [PATCH v3 2/7] powerpc: Add support for ISA v3.1 Alistair Popple
2020-05-21 1:43 ` [PATCH v3 3/7] powerpc/dt_cpu_ftrs: Advertise support for ISA v3.1 if selected Alistair Popple
2020-05-21 1:43 ` [PATCH v3 4/7] powerpc/dt_cpu_ftrs: Set current thread fscr bits Alistair Popple
2022-03-09 8:25 ` Christophe Leroy
2022-03-09 10:28 ` Michael Ellerman
2020-05-21 1:43 ` [PATCH v3 5/7] powerpc/dt_cpu_ftrs: Enable Prefixed Instructions Alistair Popple
2020-05-21 1:43 ` [PATCH v3 6/7] powerpc/dt_cpu_ftrs: Add MMA feature Alistair Popple
2020-05-21 17:17 ` Paul A. Clarke
2020-05-21 1:43 ` [PATCH v3 7/7] powerpc: Add POWER10 architected mode Alistair Popple
2020-06-09 5:28 ` [PATCH v3 0/7] Base support for POWER10 Michael Ellerman
2020-06-09 16:51 ` Murilo Opsfelder Araújo
2020-06-10 5:30 ` Michael Ellerman
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=20200521014341.29095-2-alistair@popple.id.au \
--to=alistair@popple.id.au \
--cc=aneesh.kumar@linux.ibm.com \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mikey@neuling.org \
--cc=npiggin@gmail.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