From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752460AbbKIVbW (ORCPT ); Mon, 9 Nov 2015 16:31:22 -0500 Received: from o1.f.az.sendgrid.net ([208.117.55.132]:60187 "EHLO o1.f.az.sendgrid.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751425AbbKIVbU (ORCPT ); Mon, 9 Nov 2015 16:31:20 -0500 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 Cc: Jake Oshins Subject: [PATCH 1/1] drivers:hv: Allow for MMIO claims that span ACPI _CRS records Date: Mon, 9 Nov 2015 21:30:32 +0000 Message-Id: <1447104632-12560-1-git-send-email-jakeo@microsoft.com> X-Mailer: git-send-email 1.9.1 X-SendGrid-Contentd-ID: {"test_id":"1447104679"} X-SG-EID: UsLXQ589HNP4HLBydmD9pgHURQozLYm9XliudupI8YvyQ370SzCfwQJkJyUZoP6Lkj3iGrpnDktQkm 6dgPTmq+KZnXAfQMIo2qYBW+sIoFBjI3wcW54S912+VJ0StJxJs+SBa96x7J2vuGU11tAZQZZvHzag OigkuAyPkelqOuk09r7n5mM2VJIvYXH6rCkp Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jake Oshins This patch makes 16GB GPUs work in Hyper-V VMs, since, for compatibility reasons, the Hyper-V BIOS lists MMIO ranges in 2GB chunks in its root bus's _CRS object. Signed-off-by: Jake Oshins --- drivers/hv/vmbus_drv.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index c89d0e5..aef5fae 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1075,12 +1075,28 @@ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) new_res->start = start; new_res->end = end; + /* + * Stick ranges from higher in address space at the front of the list. + * If two ranges are adjacent, merge them. + */ do { if (!*old_res) { *old_res = new_res; break; } + if (((*old_res)->end + 1) == new_res->start) { + (*old_res)->end = new_res->end; + kfree(new_res); + break; + } + + if ((*old_res)->start == new_res->end + 1) { + (*old_res)->start = new_res->start; + kfree(new_res); + break; + } + if ((*old_res)->end < new_res->start) { new_res->sibling = *old_res; if (prev_res) -- 1.9.1