From nobody Sat Nov 23 21:58:35 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 17311479499321000.4481588990562; Sat, 9 Nov 2024 02:25:49 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t9icz-0000Oy-Fp; Sat, 09 Nov 2024 05:23:38 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9iXs-0001LW-Ot; Sat, 09 Nov 2024 05:18:21 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9iXq-0008BN-Pt; Sat, 09 Nov 2024 05:18:20 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 87F0EA140D; Sat, 9 Nov 2024 13:13:51 +0300 (MSK) Received: from think4mjt.tls.msk.ru (mjtthink.wg.tls.msk.ru [192.168.177.146]) by tsrv.corpit.ru (Postfix) with ESMTP id 35628167EF8; Sat, 9 Nov 2024 13:14:46 +0300 (MSK) From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Yong-Xuan Wang , Alistair Francis , Michael Tokarev Subject: [Stable-8.2.8 40/49] hw/intc/riscv_aplic: Check and update pending when write sourcecfg Date: Sat, 9 Nov 2024 13:14:31 +0300 Message-Id: <20241109101443.312701-40-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1731147950902116600 Content-Type: text/plain; charset="utf-8" From: Yong-Xuan Wang The section 4.5.2 of the RISC-V AIA specification says that any write to a sourcecfg register of an APLIC might (or might not) cause the corresponding interrupt-pending bit to be set to one if the rectified input value is high (=3D 1) under the new source mode. If an interrupt is asserted before the driver configs its interrupt type to APLIC, it's pending bit will not be set except a relevant write to a setip or setipnum register. When we write the interrupt type to sourcecfg register, if the APLIC device doesn't check rectified input value and update the pending bit, this interrupt might never becomes pending. For APLIC.m, we can manully set pending by setip or setipnum registers in driver. But for APLIC.w, the pending status totally depends on the rectified input value, we can't control the pending status via mmio registers. In this case, hw should check and update pending status for us when writing sourcecfg registers. Update QEMU emulation to handle "pre-existing" interrupts. Signed-off-by: Yong-Xuan Wang Acked-by: Alistair Francis Message-ID: <20241004104649.13129-1-yongxuan.wang@sifive.com> Signed-off-by: Alistair Francis (cherry picked from commit 2ae6cca1d3389801ee72fc5e58c52573218f3514) Signed-off-by: Michael Tokarev diff --git a/hw/intc/riscv_aplic.c b/hw/intc/riscv_aplic.c index 71978b9870..4536f3941e 100644 --- a/hw/intc/riscv_aplic.c +++ b/hw/intc/riscv_aplic.c @@ -159,31 +159,42 @@ static bool is_kvm_aia(bool msimode) return kvm_irqchip_in_kernel() && msimode; } =20 +static bool riscv_aplic_irq_rectified_val(RISCVAPLICState *aplic, + uint32_t irq) +{ + uint32_t sourcecfg, sm, raw_input, irq_inverted; + + if (!irq || aplic->num_irqs <=3D irq) { + return false; + } + + sourcecfg =3D aplic->sourcecfg[irq]; + if (sourcecfg & APLIC_SOURCECFG_D) { + return false; + } + + sm =3D sourcecfg & APLIC_SOURCECFG_SM_MASK; + if (sm =3D=3D APLIC_SOURCECFG_SM_INACTIVE) { + return false; + } + + raw_input =3D (aplic->state[irq] & APLIC_ISTATE_INPUT) ? 1 : 0; + irq_inverted =3D (sm =3D=3D APLIC_SOURCECFG_SM_LEVEL_LOW || + sm =3D=3D APLIC_SOURCECFG_SM_EDGE_FALL) ? 1 : 0; + + return !!(raw_input ^ irq_inverted); +} + static uint32_t riscv_aplic_read_input_word(RISCVAPLICState *aplic, uint32_t word) { - uint32_t i, irq, sourcecfg, sm, raw_input, irq_inverted, ret =3D 0; + uint32_t i, irq, rectified_val, ret =3D 0; =20 for (i =3D 0; i < 32; i++) { irq =3D word * 32 + i; - if (!irq || aplic->num_irqs <=3D irq) { - continue; - } =20 - sourcecfg =3D aplic->sourcecfg[irq]; - if (sourcecfg & APLIC_SOURCECFG_D) { - continue; - } - - sm =3D sourcecfg & APLIC_SOURCECFG_SM_MASK; - if (sm =3D=3D APLIC_SOURCECFG_SM_INACTIVE) { - continue; - } - - raw_input =3D (aplic->state[irq] & APLIC_ISTATE_INPUT) ? 1 : 0; - irq_inverted =3D (sm =3D=3D APLIC_SOURCECFG_SM_LEVEL_LOW || - sm =3D=3D APLIC_SOURCECFG_SM_EDGE_FALL) ? 1 : 0; - ret |=3D (raw_input ^ irq_inverted) << i; + rectified_val =3D riscv_aplic_irq_rectified_val(aplic, irq); + ret |=3D rectified_val << i; } =20 return ret; @@ -690,6 +701,10 @@ static void riscv_aplic_write(void *opaque, hwaddr add= r, uint64_t value, (aplic->sourcecfg[irq] =3D=3D 0)) { riscv_aplic_set_pending_raw(aplic, irq, false); riscv_aplic_set_enabled_raw(aplic, irq, false); + } else { + if (riscv_aplic_irq_rectified_val(aplic, irq)) { + riscv_aplic_set_pending_raw(aplic, irq, true); + } } } else if (aplic->mmode && aplic->msimode && (addr =3D=3D APLIC_MMSICFGADDR)) { --=20 2.39.5