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Clarke" To: Alistair Popple Subject: Re: [PATCH v2 1/7] powerpc: Add new HWCAP bits Message-ID: <20200519174834.GD24922@oc3272150783.ibm.com> References: <20200519003157.31946-1-alistair@popple.id.au> <20200519003157.31946-2-alistair@popple.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200519003157.31946-2-alistair@popple.id.au> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.676 definitions=2020-05-19_06:2020-05-19, 2020-05-19 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 bulkscore=0 cotscore=-2147483648 malwarescore=0 mlxscore=0 suspectscore=0 spamscore=0 phishscore=0 impostorscore=0 mlxlogscore=626 clxscore=1015 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005190150 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aneesh.kumar@linux.ibm.com, mikey@neuling.org, linuxppc-dev@lists.ozlabs.org, npiggin@gmail.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, May 19, 2020 at 10:31:51AM +1000, Alistair Popple wrote: > POWER10 introduces two new architectural features - ISAv3.1 and matrix > multiply accumulate (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. > > Signed-off-by: Alistair Popple > --- > 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..2692a56bf20b 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 Accumulate */ Carrying the conclusion of the recent discussion further, this should also be "Matrix-Multiply Assist". PC