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[209.85.208.47]) by smtp.gmail.com with ESMTPSA id u7-20020a1709067d0700b00a26b057df46sm3979982ejo.126.2024.01.08.07.21.37 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Jan 2024 07:21:37 -0800 (PST) Received: by mail-ed1-f47.google.com with SMTP id 4fb4d7f45d1cf-555aa7fd668so2126718a12.0 for ; Mon, 08 Jan 2024 07:21:37 -0800 (PST) X-Received: by 2002:a50:ccd1:0:b0:557:2069:db87 with SMTP id b17-20020a50ccd1000000b005572069db87mr2090388edj.57.1704727297540; Mon, 08 Jan 2024 07:21:37 -0800 (PST) List-Id: FreeBSD on the RISC-V instruction set architecture List-Archive: https://lists.freebsd.org/archives/freebsd-riscv List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-riscv@freebsd.org X-BeenThere: freebsd-riscv@freebsd.org MIME-Version: 1.0 References: <7A8DC6C8-9582-455C-B05D-9F24838A9070@thechauhan.dev> <9992B290-04CA-485C-A79B-5CDFC8AA917D@fer.hr> In-Reply-To: <9992B290-04CA-485C-A79B-5CDFC8AA917D@fer.hr> From: =?UTF-8?Q?Bojan_Novkovi=C4=87?= Date: Mon, 8 Jan 2024 16:21:26 +0100 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Calling a function on other CPUs in an SMP machine To: himanshu@thechauhan.dev Cc: freebsd-riscv@freebsd.org Content-Type: multipart/alternative; boundary="0000000000000254be060e70c185" X-Spamd-Bar: -- X-Spamd-Result: default: False [-3.00 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FORGED_SENDER(0.30)[bnovkov@freebsd.org,bojan.novkovic@kset.org]; R_SPF_ALLOW(-0.20)[+ip4:209.85.128.0/17]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; RWL_MAILSPIKE_POSSIBLE(0.00)[209.85.128.42:from]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; MISSING_XM_UA(0.00)[]; ASN(0.00)[asn:15169, ipnet:209.85.128.0/17, country:US]; MIME_TRACE(0.00)[0:+,1:+,2:~]; RCPT_COUNT_TWO(0.00)[2]; R_DKIM_NA(0.00)[]; MLMMJ_DEST(0.00)[freebsd-riscv@freebsd.org]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_NONE(0.00)[]; FROM_NEQ_ENVFROM(0.00)[bnovkov@freebsd.org,bojan.novkovic@kset.org]; ARC_NA(0.00)[]; PREVIOUSLY_DELIVERED(0.00)[freebsd-riscv@freebsd.org]; DMARC_NA(0.00)[freebsd.org]; RCVD_TLS_LAST(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; RCVD_IN_DNSWL_NONE(0.00)[209.85.128.42:from,209.85.208.47:received] X-Rspamd-Queue-Id: 4T7yTH41xTz4NQt --0000000000000254be060e70c185 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Jan 8, 2024 at 3:49=E2=80=AFPM Himanshu Chauhan wrote: > What is the best way to call a function (like a per-cpu setup function fr= om a driver) on remote CPUs in an SMP machine? > > The 'smp_rendezvous{_cpu}' functions in 'sys/smp.h' are what you are looking for. They are not listed in the manpages, but you can find more information about them in 'kern/subr_smp.c'. Bojan --0000000000000254be060e70c185 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Mon, Jan 8, 2024 at 3:49=E2=80=AFPM=C2= =A0Himanshu Chauhan <himanshu@thechauhan.dev> wrote:
What is the best way to call=
 a function (like a per-cpu setup function from a driver) on remote CPUs in=
 an SMP machine?
The 'smp_rendezvous{_= cpu}' functions in 'sys/smp.h' are what you are looking for.
They are not listed in the manpages, but you can find more inf= ormation about them in 'kern/subr_smp.c'.

= Bojan
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