From patchwork Thu Oct 29 23:46:10 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jake Oshins X-Patchwork-Id: 538080 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id ACD56141176 for ; Fri, 30 Oct 2015 10:49:20 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=sendgrid.me header.i=@sendgrid.me header.b=x+qHAnQb; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758385AbbJ2XtS (ORCPT ); Thu, 29 Oct 2015 19:49:18 -0400 Received: from o1.f.az.sendgrid.net ([208.117.55.132]:63556 "EHLO o1.f.az.sendgrid.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757667AbbJ2XrB (ORCPT ); Thu, 29 Oct 2015 19:47:01 -0400 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sendgrid.me; h=from:to:cc:subject:in-reply-to:references; s=smtpapi; bh=0xquipUBBF6SA3KM5xvrYt5V0zE=; b=x+qHAnQbaQaN77NQNTCVjHyOB3Jia zUOCayb3NUsnlzl2/nnOfDQwCUWA5+okhTEdRlNf22oe2lwM3Ewz8mDkga6CeHOF /4FYKczWFA1FjVirquw52mKEFpxIRe+zhfU6oUZHXbyvkGVzkVXhsfO1MuGYnFRy apy3CtLIv1YwEI= Received: by filter-451.sjc1.sendgrid.net with SMTP id filter-451.29078.5632AFF253 2015-10-29 23:46:58.856217212 +0000 UTC Received: from jakeoshinsu2.jakeoshinsu2.d1.internal.cloudapp.net (unknown [104.210.40.47]) by ismtpd0007p1las1.sendgrid.net (SG) with ESMTP id bG0WaL0tQ6SOhm1X-JhnVQ Thu, 29 Oct 2015 23:46:58.198 +0000 (UTC) From: jakeo@microsoft.com To: gregkh@linuxfoundation.org, kys@microsoft.com, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com, tglx@redhat.com, haiyangz@microsoft.com, marc.zyngier@arm.com, jiang.liu@linux.intel.com, bhelgaas@google.com, linux-pci@vger.kernel.org Cc: Jake Oshins Subject: [PATCH v4 1/7] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num Date: Thu, 29 Oct 2015 23:46:10 +0000 Message-Id: <1446162376-43419-2-git-send-email-jakeo@microsoft.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1446162376-43419-1-git-send-email-jakeo@microsoft.com> References: <1446162376-43419-1-git-send-email-jakeo@microsoft.com> X-SG-EID: lfnueJVzSjg1mfuVqqukVH7tZvRy9mfCIcBnfbfzaMN80X8aB29+dibnyajIT1i26dWNv91LUrj90g ASXXR4Bbgh77nDZOuKNs6xpSUjEY6CmC7nkh2FeRYjzINn+TFYqRWqbBll1IGeVPTzsocjS2YZegbz vIakijjqaVbflpc= Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Jake Oshins This patch exposes the mapping between Linux CPU number and Hyper-V virtual processor number. This is necessary because the hypervisor needs to know which virtual processor to target when making a mapping in the Interrupt Redirection Table in the I/O MMU. Signed-off-by: Jake Oshins --- drivers/hv/vmbus_drv.c | 17 +++++++++++++++++ include/linux/hyperv.h | 2 ++ 2 files changed, 19 insertions(+) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index f19b6f7..c89d0e5 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1191,6 +1191,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, } EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); +/** + * vmbus_cpu_number_to_vp_number() - Map CPU to VP. + * @cpu_number: CPU number in Linux terms + * + * This function returns the mapping between the Linux processor + * number and the hypervisor's virtual processor number, useful + * in making hypercalls and such that talk about specific + * processors. + * + * Return: Virtual processor number in Hyper-V terms + */ +int vmbus_cpu_number_to_vp_number(int cpu_number) +{ + return hv_context.vp_index[cpu_number]; +} +EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number); + static int vmbus_acpi_add(struct acpi_device *device) { acpi_status result; diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 54733d5..02393b6 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -982,6 +982,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, resource_size_t size, resource_size_t align, bool fb_overlap_ok); +int vmbus_cpu_number_to_vp_number(int cpu_number); + /** * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device *