From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761764AbZE0HlL (ORCPT ); Wed, 27 May 2009 03:41:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1760943AbZE0HiF (ORCPT ); Wed, 27 May 2009 03:38:05 -0400 Received: from claw.goop.org ([74.207.240.146]:41718 "EHLO claw.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761648AbZE0HiD (ORCPT ); Wed, 27 May 2009 03:38:03 -0400 From: Jeremy Fitzhardinge To: Ingo Molnar Cc: the arch/x86 maintainers , Linux Kernel Mailing List , Xen-devel , Greg KH , Jens Axboe , Chris Wright , kurt.hackel@oracle.com, Andrew Morton , Ky Srinivasan , Beulich , Linus Torvalds , Avi Kivity , Jeremy Fitzhardinge , Jeremy Fitzhardinge Subject: [PATCH 07/17] xen/apic: identity map gsi->irqs Date: Wed, 27 May 2009 00:37:20 -0700 Message-Id: <1243409850-21577-8-git-send-email-jeremy@goop.org> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1243409850-21577-1-git-send-email-jeremy@goop.org> References: <1243409850-21577-1-git-send-email-jeremy@goop.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jeremy Fitzhardinge Reserve the lower irq range for use for hardware interrupts so we can identity-map them. [ Impact: preserve compat with native ] Signed-off-by: Jeremy Fitzhardinge --- drivers/xen/events.c | 23 +++++++++++++++++------ 1 files changed, 17 insertions(+), 6 deletions(-) diff --git a/drivers/xen/events.c b/drivers/xen/events.c index fd98c19..88395bb 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include #include @@ -40,9 +41,6 @@ #include #include -/* Leave low irqs free for identity mapping */ -#define LEGACY_IRQS 16 - /* * This lock protects updates to the following mapping and reference-count * arrays. The lock does not need to be acquired to read the mapping tables. @@ -344,12 +342,24 @@ static void unmask_evtchn(int port) put_cpu(); } +static int get_nr_hw_irqs(void) +{ + int ret = 1; + +#ifdef CONFIG_X86_IO_APIC + ret = get_nr_irqs_gsi(); +#endif + + return ret; +} + static int find_unbound_irq(void) { int irq; struct irq_desc *desc; + int start = get_nr_hw_irqs(); - for (irq = LEGACY_IRQS; irq < nr_irqs; irq++) + for (irq = start; irq < nr_irqs; irq++) if (irq_info[irq].type == IRQT_UNBOUND) break; @@ -367,8 +377,8 @@ static int find_unbound_irq(void) static bool identity_mapped_irq(unsigned irq) { - /* only identity map legacy irqs */ - return irq < LEGACY_IRQS; + /* identity map all the hardware irqs */ + return irq < get_nr_hw_irqs(); } static void pirq_unmask_notify(int irq) @@ -537,6 +547,7 @@ int xen_allocate_pirq(unsigned gsi) if (identity_mapped_irq(gsi)) { irq = gsi; + irq_to_desc_alloc_cpu(irq, 0); dynamic_irq_init(irq); } else irq = find_unbound_irq(); -- 1.6.0.6