From patchwork Thu Aug 16 15:36:07 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 1334141 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork2.kernel.org (Postfix) with ESMTP id 4818CDFB34 for ; Thu, 16 Aug 2012 16:03:25 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1T22Ts-0006Nc-9C; Thu, 16 Aug 2012 15:59:33 +0000 Received: from smtp.citrix.com ([66.165.176.89]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1T22RO-0004i8-3V for linux-arm-kernel@lists.infradead.org; Thu, 16 Aug 2012 15:56:59 +0000 X-IronPort-AV: E=Sophos;i="4.77,778,1336363200"; d="scan'208";a="34872811" Received: from ftlpmailmx01.citrite.net ([10.13.107.65]) by FTLPIPO01.CITRIX.COM with ESMTP/TLS/RC4-MD5; 16 Aug 2012 11:56:57 -0400 Received: from ukmail1.uk.xensource.com (10.80.16.128) by smtprelay.citrix.com (10.13.107.65) with Microsoft SMTP Server id 8.3.213.0; Thu, 16 Aug 2012 11:56:57 -0400 Received: from kaball.uk.xensource.com ([10.80.2.59]) by ukmail1.uk.xensource.com with esmtp (Exim 4.69) (envelope-from ) id 1T227b-0007Iu-Er; Thu, 16 Aug 2012 16:36:31 +0100 From: Stefano Stabellini To: Subject: [PATCH v3 15/25] xen/arm: receive Xen events on ARM Date: Thu, 16 Aug 2012 16:36:07 +0100 Message-ID: <1345131377-14713-15-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-Spam-Note: CRM114 invocation failed X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [66.165.176.89 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: xen-devel@lists.xensource.com, linaro-dev@lists.linaro.org, Ian.Campbell@citrix.com, arnd@arndb.de, konrad.wilk@oracle.com, catalin.marinas@arm.com, Stefano Stabellini , tim@xen.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Compile events.c on ARM. Parse, map and enable the IRQ to get event notifications from the device tree (node "/xen"). Signed-off-by: Stefano Stabellini --- arch/arm/include/asm/xen/events.h | 18 ++++++++++++++++++ arch/arm/xen/enlighten.c | 33 +++++++++++++++++++++++++++++++++ arch/x86/xen/enlighten.c | 1 + arch/x86/xen/irq.c | 1 + arch/x86/xen/xen-ops.h | 1 - drivers/xen/events.c | 17 ++++++++++++++--- include/xen/events.h | 2 ++ 7 files changed, 69 insertions(+), 4 deletions(-) create mode 100644 arch/arm/include/asm/xen/events.h diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h new file mode 100644 index 0000000..94b4e90 --- /dev/null +++ b/arch/arm/include/asm/xen/events.h @@ -0,0 +1,18 @@ +#ifndef _ASM_ARM_XEN_EVENTS_H +#define _ASM_ARM_XEN_EVENTS_H + +#include + +enum ipi_vector { + XEN_PLACEHOLDER_VECTOR, + + /* Xen IPIs go here */ + XEN_NR_IPIS, +}; + +static inline int xen_irqs_disabled(struct pt_regs *regs) +{ + return raw_irqs_disabled_flags(regs->ARM_cpsr); +} + +#endif /* _ASM_ARM_XEN_EVENTS_H */ diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index 2e65e8d..14af29d 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -1,4 +1,5 @@ #include +#include #include #include #include @@ -9,6 +10,8 @@ #include #include #include +#include +#include #include #include #include @@ -33,6 +36,8 @@ EXPORT_SYMBOL_GPL(xen_have_vector_callback); int xen_platform_pci_unplug = XEN_UNPLUG_ALL; EXPORT_SYMBOL_GPL(xen_platform_pci_unplug); +static __read_mostly int xen_events_irq = -1; + int xen_remap_domain_mfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long mfn, int nr, @@ -74,6 +79,9 @@ static int __init xen_guest_init(void) if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res)) return 0; xen_hvm_resume_frames = res.start >> PAGE_SHIFT; + xen_events_irq = irq_of_parse_and_map(node, 0); + pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n", + version, xen_events_irq, xen_hvm_resume_frames); xen_domain_type = XEN_HVM_DOMAIN; xen_setup_features(); @@ -115,3 +123,28 @@ static int __init xen_guest_init(void) return 0; } core_initcall(xen_guest_init); + +static irqreturn_t xen_arm_callback(int irq, void *arg) +{ + xen_hvm_evtchn_do_upcall(); + return IRQ_HANDLED; +} + +static int __init xen_init_events(void) +{ + if (!xen_domain() || xen_events_irq < 0) + return -ENODEV; + + xen_init_IRQ(); + + if (request_percpu_irq(xen_events_irq, xen_arm_callback, + "events", xen_vcpu)) { + pr_err("Error requesting IRQ %d\n", xen_events_irq); + return -EINVAL; + } + + enable_percpu_irq(xen_events_irq, 0); + + return 0; +} +postcore_initcall(xen_init_events); diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index ff962d4..9f8b0ef 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -33,6 +33,7 @@ #include #include +#include #include #include #include diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c index 1573376..01a4dc0 100644 --- a/arch/x86/xen/irq.c +++ b/arch/x86/xen/irq.c @@ -5,6 +5,7 @@ #include #include #include +#include #include #include diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 202d4c1..2368295 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -35,7 +35,6 @@ void xen_set_pat(u64); char * __init xen_memory_setup(void); void __init xen_arch_setup(void); -void __init xen_init_IRQ(void); void xen_enable_sysenter(void); void xen_enable_syscall(void); void xen_vcpu_restore(void); diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 7da65d3..c3516d3 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -31,14 +31,16 @@ #include #include +#ifdef CONFIG_X86 #include #include #include #include #include -#include #include #include +#endif +#include #include #include @@ -50,6 +52,9 @@ #include #include #include +#include +#include +#include /* * This lock protects updates to the following mapping and reference-count @@ -1377,7 +1382,9 @@ void xen_evtchn_do_upcall(struct pt_regs *regs) { struct pt_regs *old_regs = set_irq_regs(regs); +#ifdef CONFIG_X86 exit_idle(); +#endif irq_enter(); __xen_evtchn_do_upcall(); @@ -1786,9 +1793,9 @@ void xen_callback_vector(void) void xen_callback_vector(void) {} #endif -void __init xen_init_IRQ(void) +void xen_init_IRQ(void) { - int i, rc; + int i; evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq), GFP_KERNEL); @@ -1804,6 +1811,7 @@ void __init xen_init_IRQ(void) pirq_needs_eoi = pirq_needs_eoi_flag; +#ifdef CONFIG_X86 if (xen_hvm_domain()) { xen_callback_vector(); native_init_IRQ(); @@ -1811,6 +1819,7 @@ void __init xen_init_IRQ(void) * __acpi_register_gsi can point at the right function */ pci_xen_hvm_init(); } else { + int rc; struct physdev_pirq_eoi_gmfn eoi_gmfn; irq_ctx_init(smp_processor_id()); @@ -1826,4 +1835,6 @@ void __init xen_init_IRQ(void) } else pirq_needs_eoi = pirq_check_eoi_map; } +#endif } +EXPORT_SYMBOL_GPL(xen_init_IRQ); diff --git a/include/xen/events.h b/include/xen/events.h index 04399b2..c6bfe01 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -109,4 +109,6 @@ int xen_irq_from_gsi(unsigned gsi); /* Determine whether to ignore this IRQ if it is passed to a guest. */ int xen_test_irq_shared(int irq); +/* initialize Xen IRQ subsystem */ +void xen_init_IRQ(void); #endif /* _XEN_EVENTS_H */