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Tue, 16 Sep 2025 04:16:37 +0000 (GMT) Message-ID: <589f259e-1db9-4ec2-accc-b27966d09a3e@linux.ibm.com> Date: Tue, 16 Sep 2025 09:46:36 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC V2 7/8] powerpc: Enable IRQ generic entry/exit path. To: Mukesh Kumar Chaurasiya , maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu References: <20250908210235.137300-2-mchauras@linux.ibm.com> <20250908210235.137300-10-mchauras@linux.ibm.com> From: Shrikanth Hegde Content-Language: en-US Cc: oleg@redhat.com, kees@kernel.org, luto@amacapital.net, wad@chromium.org, deller@gmx.de, ldv@strace.io, macro@orcam.me.uk, charlie@rivosinc.com, akpm@linux-foundation.org, bigeasy@linutronix.de, ankur.a.arora@oracle.com, naveen@kernel.org, thomas.weissschuh@linutronix.de, Jason@zx2c4.com, peterz@infradead.org, tglx@linutronix.de, namcao@linutronix.de, kan.liang@linux.intel.com, mingo@kernel.org, oliver.upton@linux.dev, mark.barnett@arm.com, atrajeev@linux.vnet.ibm.com, rppt@kernel.org, coltonlewis@google.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org In-Reply-To: <20250908210235.137300-10-mchauras@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=BKWzrEQG c=1 sm=1 tr=0 ts=68c8e4ca cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=VnNF1IyMAAAA:8 a=0PegofB9Ehvu-5fvZ-0A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: cFHjTyaiwG-2xZoHkKLBrdYb5i7Ajopr X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTE1MDA4NiBTYWx0ZWRfX/MiUy93ScqHQ TK/XilKI282VEMPGrs+ZuM83QHIB6c+odFVOzaSltZDqsJIpjfryIufz1yTcRT/C4/Lr1+6iz0U 81F7xeMJuR6MBTTaB3asQ67YMt5YJuw5O+i4mD0nAdWRysJS6tM3Lp9eyzt2HtNfxtlKsfCtuO6 L94fTra1/pwZAvCPA7E4GkHGwHsCJ9Jn0WyzYl3pBUuwlktCzlEXIA+ar/9VzbHknBjIlkuu/vv /wWt8u1c51HQj41SUVP+nvAFUAJydMHyHfvqm4vuKro+Idn3j33YjfhhYbWE929DurTu3j0/Tfs HkN8800Q0G9a6tAkUjX4MBcOizlfy1lfrotFtOxlRQlbUCoQZKUWhbrLQrydfuWp/s0RBT5CSUY 5L6is53O X-Proofpoint-ORIG-GUID: huUVE0SOMz9TpgoGifUCpWb_sly1_8Hl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-16_01,2025-09-12_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 adultscore=0 suspectscore=0 impostorscore=0 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509150086 On 9/9/25 2:32 AM, Mukesh Kumar Chaurasiya wrote: > Enable generic entry/exit path for ppc irq. > > Signed-off-by: Mukesh Kumar Chaurasiya > --- > arch/powerpc/Kconfig | 1 + > arch/powerpc/include/asm/entry-common.h | 93 ++--- > arch/powerpc/include/asm/interrupt.h | 492 +++--------------------- > arch/powerpc/kernel/interrupt.c | 9 +- > arch/powerpc/kernel/interrupt_64.S | 2 - > 5 files changed, 92 insertions(+), 505 deletions(-) > \ > diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c > index f53d432f60870..7bb8a31b24ea7 100644 > --- a/arch/powerpc/kernel/interrupt.c > +++ b/arch/powerpc/kernel/interrupt.c > @@ -297,13 +297,8 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs) > /* Returning to a kernel context with local irqs enabled. */ > WARN_ON_ONCE(!(regs->msr & MSR_EE)); > again: > - if (need_irq_preemption()) { > - /* Return to preemptible kernel context */ > - if (unlikely(read_thread_flags() & _TIF_NEED_RESCHED)) { > - if (preempt_count() == 0) > - preempt_schedule_irq(); > - } > - } > + if (need_irq_preemption()) > + irqentry_exit_cond_resched(); irqentry_exit_cond_resched is also called in irqentry_exit. It would be better if we can find ways to avoid calling it again. I see a loop here. But comment says it is not enabling irq again. so the loop is bounded. So might be okay to remove cond_resched here. do run preemptirq, irq tracers to ensure that is case. Also, what is this "soft_interrupts"? > > check_return_regs_valid(regs); > > diff --git a/arch/powerpc/kernel/interrupt_64.S b/arch/powerpc/kernel/interrupt_64.S > index 1ad059a9e2fef..6aa88fe91fb6a 100644 > --- a/arch/powerpc/kernel/interrupt_64.S > +++ b/arch/powerpc/kernel/interrupt_64.S > @@ -418,8 +418,6 @@ _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()) > beq interrupt_return_\srr\()_kernel > interrupt_return_\srr\()_user: /* make backtraces match the _kernel variant */ > _ASM_NOKPROBE_SYMBOL(interrupt_return_\srr\()_user) > - addi r3,r1,STACK_INT_FRAME_REGS > - bl CFUNC(interrupt_exit_user_prepare) > #ifndef CONFIG_INTERRUPT_SANITIZE_REGISTERS > cmpdi r3,0 > bne- .Lrestore_nvgprs_\srr