From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DB417C369A2 for ; Fri, 11 Apr 2025 17:08:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=QFhMhZ7q0HyfLSwm9a0a804WEdlzAwTl/Wzichs2tKQ=; b=ULwhsHAeJJUILhfOFdjiqnwZPd AdEHNyab+/CBusBX5VUI9kYMHW1hWfigd3X+EmPq9+KxQlVpqFAC6vFGJGDFfK6Ypv0w/UeOdOzk4 HSPAQKrdqJLRWvBx546Q+lAZDPUZ8KkcF5pYb3oRZW8sD03CxSGObpAq5sgNK8Rjd+w/wZKaWsPmf ivsHoPwTBnnUUTPxwVHwbGUiRL0c0G/djAMUewGPA1NCJIeYQEjb+ZuccS6I+7OQ1JU2eFb9LaC8r HCliOQk7FaD+BxDR9dZr4XBaW1ACHgbUKtB7ey9o022cD80wlUOEV29AsWbIc64VMH1W3J7Po5wpb XYPSGcdQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u3HrN-0000000ET42-41sL; Fri, 11 Apr 2025 17:08:09 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u3HpZ-0000000EScH-1h3Z for linux-arm-kernel@lists.infradead.org; Fri, 11 Apr 2025 17:06:17 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 8BF8768471; Fri, 11 Apr 2025 17:06:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BD2DC4CEE2; Fri, 11 Apr 2025 17:06:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744391176; bh=LCpOJCeSOBB59YaAWLr3Fa430+JRYrnTRAqBnQl3nDo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=khB2ukdP9E7ti/hWeipsjfCxlbBBJqi3+4gJYHi5XMJbNV9jvfxiVYgF5eMeVvMoa Y0UlV7DtSyHXnwwQoa9s7A7jz5vJ73aMZ0wmHZljZzU/jZMALX0Vl0wmdCI5opihXS iq7OwCh0j6bwL78DWHoXhkB0Kogu+9cn8b+cGzAuxm/a4n6xw6wAJzrmsPaMIFyBQa 18iLaTQdaEYxrtDSnBK3RJZfsPvuB91u03+NXu5auzG7SFmf7VY6LgvngbYuNyTKsV PxzbSPg6vsnuSmPgkJiG/R0WQnVrShiYHxTC1pB+e82PHEbDpKZBdF774NhGdOGwMw wgydXuYTfOPIg== Date: Fri, 11 Apr 2025 19:06:09 +0200 From: Lorenzo Pieralisi To: Thomas Gleixner Cc: Marc Zyngier , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Sascha Bischoff , Timothy Hayes , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH 18/24] irqchip/gic-v5: Add GICv5 PPI support Message-ID: References: <20250408-gicv5-host-v1-0-1f26db465f8d@kernel.org> <20250408-gicv5-host-v1-18-1f26db465f8d@kernel.org> <877c3uuy7u.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <877c3uuy7u.ffs@tglx> 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, Apr 08, 2025 at 11:42:29PM +0200, Thomas Gleixner wrote: [...] > > +static int gicv5_ppi_irq_set_irqchip_state(struct irq_data *d, > > + enum irqchip_irq_state which, > > + bool val) > > +{ > > + u64 hwirq_id_bit = BIT_ULL(d->hwirq % 64); > > + > > + switch (which) { > > + case IRQCHIP_STATE_PENDING: > > + if (val) { > > + if (d->hwirq < 64) > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_SPENDR0_EL1); > > + else > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_SPENDR1_EL1); > > + > > + } else { > > + if (d->hwirq < 64) > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_CPENDR0_EL1); > > + else > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_CPENDR1_EL1); > > + } > > + > > + return 0; > > + case IRQCHIP_STATE_ACTIVE: > > + if (val) { > > + if (d->hwirq < 64) > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_SACTIVER0_EL1); > > + else > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_SACTIVER1_EL1); > > + } else { > > + if (d->hwirq < 64) > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_CACTIVER0_EL1); > > + else > > + write_sysreg_s(hwirq_id_bit, > > + SYS_ICC_PPI_CACTIVER1_EL1); > > + } > > You already precalculate hwirq_id_bit. Can't you do something similar > for the registers? > > case IRQCHIP_STATE_PENDING: > u32 reg = val ? SYS_ICC_PPI_SPENDR1_EL1 : SYS_ICC_PPI_SPENDR0_EL1; > > write_sysreg_s(hwirq_id_bit, reg); > return 0; > case IRQCHIP_STATE_ACTIVE: > .... > > Ditto in the get_state() function. > > No? Can't do it like that, write_sysreg_s takes a register encoding, not a u32 offset, I will see if I can wrap it in a macro, even though that might obfuscate a bit rather than clarify. > > +static asmlinkage void __exception_irq_entry > > +gicv5_handle_irq(struct pt_regs *regs) > > +{ > > + u64 ia; > > + bool valid; > > + u32 hwirq; > > See above > > > + ia = gicr_insn(GICV5_OP_GICR_CDIA); > > + valid = GICV5_GIC_CDIA_VALID(ia); > > And please move that to the declaration lines gicr_insn() is an instruction ACK'ing the IRQ, I would leave it like this explicitly if you don't mind lest it gave the impression that it is an initializer. Thanks, Lorenzo > > +static int __init gicv5_init_domains(struct fwnode_handle *handle) > > +{ > > + gicv5_global_data.fwnode = handle; > > + gicv5_global_data.ppi_domain = irq_domain_create_linear( > > + handle, 128, &gicv5_irq_ppi_domain_ops, NULL); > > The ever changing choice of coding styles across functions is really > interesting. Obviously the length of 'gicv5_global_data.ppi_domain' > forces ugly, but that does not mean it needs to be that way: > > struct irqdomain *d; > > d = irq_domain_create_linear(handle, 128, &gicv5_irq_ppi_domain_ops, NULL); > if (!d) > return - ENOMEM; > > irq_domain_update_bus_token(d, DOMAIN_BUS_WIRED); > gicv5_global_data.fwnode = handle; > gicv5_global_data.ppi_domain = d; > return 0; > > No? > > > +static int __init gicv5_of_init(struct device_node *node, > > + struct device_node *parent) > > +{ > > + int ret; > > + > > + ret = gicv5_init_domains(&node->fwnode); > > + if (ret) > > + return ret; > > + > > + gicv5_set_cpuif_pribits(); > > + > > + ret = gicv5_starting_cpu(smp_processor_id()); > > You invoke the CPU hotplug callback for the boot CPU explicitly, but > what the heck installs the actual hotplug callback for the secondary > CPUs? > > Thanks, > > tglx