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Mon, 07 Feb 2022 16:15:40 -0800 (PST) Subject: Re: [PATCH v11 31/40] kselftest/arm64: sme: Add SME support to vlset To: Mark Brown , Catalin Marinas , Will Deacon , Marc Zyngier , Shuah Khan Cc: Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Shuah Khan References: <20220207152109.197566-1-broonie@kernel.org> <20220207152109.197566-32-broonie@kernel.org> From: Shuah Khan Message-ID: Date: Mon, 7 Feb 2022 17:15:39 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20220207152109.197566-32-broonie@kernel.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220207_161542_046997_31FE04FC X-CRM114-Status: GOOD ( 22.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/7/22 8:21 AM, Mark Brown wrote: > The Scalable Matrix Extenions (SME) introduces additional register state > with configurable vector lengths, similar to SVE but configured separately. > Extend vlset to support configuring this state with a --sme or -s command > line option. It would be useful to add a -g command to get the current value. -g would just do PR_SVE_GET_VL and print the value perhaps? > > Signed-off-by: Mark Brown > --- > tools/testing/selftests/arm64/fp/vlset.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/arm64/fp/vlset.c b/tools/testing/selftests/arm64/fp/vlset.c > index 308d27a68226..76912a581a95 100644 > --- a/tools/testing/selftests/arm64/fp/vlset.c > +++ b/tools/testing/selftests/arm64/fp/vlset.c > @@ -22,12 +22,15 @@ static int inherit = 0; > static int no_inherit = 0; > static int force = 0; > static unsigned long vl; > +static int set_ctl = PR_SVE_SET_VL; > +static int get_ctl = PR_SVE_GET_VL; > > static const struct option options[] = { > { "force", no_argument, NULL, 'f' }, > { "inherit", no_argument, NULL, 'i' }, > { "max", no_argument, NULL, 'M' }, > { "no-inherit", no_argument, &no_inherit, 1 }, > + { "sme", no_argument, NULL, 's' }, > { "help", no_argument, NULL, '?' }, > {} > }; > @@ -50,6 +53,9 @@ static int parse_options(int argc, char **argv) > case 'M': vl = SVE_VL_MAX; break; > case 'f': force = 1; break; > case 'i': inherit = 1; break; > + case 's': set_ctl = PR_SME_SET_VL; > + get_ctl = PR_SME_GET_VL; > + break; > case 0: break; > default: goto error; > } > @@ -125,14 +131,14 @@ int main(int argc, char **argv) > if (inherit) > flags |= PR_SVE_VL_INHERIT; > > - t = prctl(PR_SVE_SET_VL, vl | flags); > + t = prctl(set_ctl, vl | flags); > if (t < 0) { > fprintf(stderr, "%s: PR_SVE_SET_VL: %s\n", > program_name, strerror(errno)); > goto error; > } > > - t = prctl(PR_SVE_GET_VL); > + t = prctl(get_ctl); > if (t == -1) { > fprintf(stderr, "%s: PR_SVE_GET_VL: %s\n", > program_name, strerror(errno)); > With the above comment addressed or explained: Reviewed-by: Shuah Khan thanks, -- Shuah _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel