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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C94CFC433EF for ; Mon, 11 Oct 2021 13:24:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AD31A6103C for ; Mon, 11 Oct 2021 13:24:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236886AbhJKN0y (ORCPT ); Mon, 11 Oct 2021 09:26:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:53672 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236854AbhJKN0x (ORCPT ); Mon, 11 Oct 2021 09:26:53 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9184360F4B; Mon, 11 Oct 2021 13:24:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1633958693; bh=9m+DpA2gtePLN7XyZpxzMA7snyaATDs0wGR8pRq60OM=; h=From:To:Cc:Subject:Date:From; b=OknVS/UUtvpIldUY9L+Z5/8DtV814XWzm+/jNAeRChjsxzyMUQ0RYU60pVl4RwFx/ eBe1v/X5SNCXq7gTbsewcqr5rmZw+8E9C/ssUtkl7X4UN6Jqrlvy8tsgJaNDqnbyqu ovpckISFNQ9lAKSg0UZDCuxDcmCWkVY615NTXVDdg0wFN4QWr5wPpu62fEJMesu9T2 k6RuyB3LVKcmGfR60gbAZkemvQVGs59TkLCCrIKbgmNAvW3ajWqdxPcw4TyhHe4nVb 0el3/hwHYEV6ZH06dmcUFGp9GnkgjlPvXBs7MpvaiWFfHv3Z8ezaZA93i+vUEkD5nK AoiLvYQRROjcA== From: guoren@kernel.org To: guoren@kernel.org, anup@brainfault.org, atish.patra@wdc.com, maz@kernel.org, tglx@linutronix.de, palmer@dabbelt.com Cc: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Guo Ren Subject: [PATCH 1/2] irqchip/sifive-plic: Fix duplicate mask/unmask for claim/complete Date: Mon, 11 Oct 2021 21:24:30 +0800 Message-Id: <20211011132431.2792797-1-guoren@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Guo Ren PLIC only has enable-registers not mask/unmask registers. Mixing mask/unmask with irq_eoi is wrong, because readl(claim) could mask irq by hardware. We only need mask/unmask to fixup the hardware which couldn't claim + mask correctly. If hardware supports claim + mask, it would cause unnecessary mask/umak operations. Signed-off-by: Guo Ren Cc: Thomas Gleixner Cc: Marc Zyngier Cc: Palmer Dabbelt Cc: Anup Patel Cc: Atish Patra --- drivers/irqchip/irq-sifive-plic.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index cf74cfa82045..0fa46912f452 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -64,6 +64,7 @@ struct plic_priv { struct cpumask lmask; struct irq_domain *irqdomain; void __iomem *regs; + bool claim_mask_support; }; struct plic_handler { @@ -111,7 +112,7 @@ static inline void plic_irq_toggle(const struct cpumask *mask, } } -static void plic_irq_unmask(struct irq_data *d) +static void plic_irq_enable(struct irq_data *d) { struct cpumask amask; unsigned int cpu; @@ -125,7 +126,7 @@ static void plic_irq_unmask(struct irq_data *d) plic_irq_toggle(cpumask_of(cpu), d, 1); } -static void plic_irq_mask(struct irq_data *d) +static void plic_irq_disable(struct irq_data *d) { struct plic_priv *priv = irq_data_get_irq_chip_data(d); @@ -168,8 +169,8 @@ static void plic_irq_eoi(struct irq_data *d) static struct irq_chip plic_chip = { .name = "SiFive PLIC", - .irq_mask = plic_irq_mask, - .irq_unmask = plic_irq_unmask, + .irq_enable = plic_irq_enable, + .irq_disable = plic_irq_disable, .irq_eoi = plic_irq_eoi, #ifdef CONFIG_SMP .irq_set_affinity = plic_set_affinity, @@ -181,6 +182,11 @@ static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq, { struct plic_priv *priv = d->host_data; + if (!priv->claim_mask_support) { + plic_chip.irq_mask = plic_irq_disable; + plic_chip.irq_unmask = plic_irq_enable; + } + irq_domain_set_info(d, irq, hwirq, &plic_chip, d->host_data, handle_fasteoi_irq, NULL, NULL); irq_set_noprobe(irq); @@ -298,6 +304,8 @@ static int __init plic_init(struct device_node *node, if (WARN_ON(!nr_contexts)) goto out_iounmap; + priv->claim_mask_support = of_property_read_bool(node, "claim-mask-support"); + error = -ENOMEM; priv->irqdomain = irq_domain_add_linear(node, nr_irqs + 1, &plic_irqdomain_ops, priv); -- 2.25.1