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Tue, 30 Jun 2026 06:58:22 -0400 (EDT) Date: Tue, 30 Jun 2026 11:58:21 +0100 From: Kiryl Shutsemau To: Usama Arif Cc: Catalin Marinas , Will Deacon , James Morse , Mark Rutland , Marc Zyngier , Doug Anderson , Petr Mladek , Thomas Gleixner , Andrew Morton , Baoquan He , Puranjay Mohan , Breno Leitao , Julien Thierry , Lecopzer Chen , Sumit Garg , kernel-team@meta.com, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v5 2/4] firmware: arm_sdei: add SDEI_EVENT_SIGNAL support Message-ID: References: <20260630105125.4006859-1-usama.arif@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260630105125.4006859-1-usama.arif@linux.dev> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260630_035825_322931_FC783A8F X-CRM114-Status: GOOD ( 22.95 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Jun 30, 2026 at 03:51:24AM -0700, Usama Arif wrote: > On Mon, 29 Jun 2026 16:07:16 +0100 Kiryl Shutsemau wrote: > > > From: "Kiryl Shutsemau (Meta)" > > > > Add sdei_event_signal(), a thin wrapper over the SDEI_EVENT_SIGNAL call > > (DEN0054) that makes the software-signalled event (event 0) pending on a > > target PE -- delivered NMI-like even when that PE has interrupts masked. > > It takes no locks, so it is safe to call from NMI / crash context. > > > > Signed-off-by: Kiryl Shutsemau (Meta) > > Reviewed-by: Douglas Anderson > > --- > > drivers/firmware/arm_sdei.c | 12 ++++++++++++ > > include/linux/arm_sdei.h | 6 ++++++ > > include/uapi/linux/arm_sdei.h | 1 + > > 3 files changed, 19 insertions(+) > > > > diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c > > index c161cf263547..e8dd2f0f3919 100644 > > --- a/drivers/firmware/arm_sdei.c > > +++ b/drivers/firmware/arm_sdei.c > > @@ -339,6 +339,18 @@ static void _ipi_unmask_cpu(void *ignored) > > sdei_unmask_local_cpu(); > > } > > > > +/* > > + * Signal the software-signalled event (event 0) to @mpidr. Does nothing > > + * but the SMC -- no locks, no event lookup -- so it is safe from NMI / > > + * crash context (e.g. the cross-CPU NMI service). > > + */ > > +int sdei_event_signal(u32 event_num, u64 mpidr) > > +{ > > + return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_SIGNAL, event_num, > > + mpidr, 0, 0, 0, NULL); > > +} > > +NOKPROBE_SYMBOL(sdei_event_signal); > > + > > Same as patch 1, can this be merged in patch 3? Its good to keep functions > where they are used. Patch 3 is big as it is. I don't think folding code that can be a standalone patch helps the situation. -- Kiryl Shutsemau / Kirill A. Shutemov