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Groups > linux.kernel > #1266896

[PATCH 11/11] drivers:hv: Allow for MMIO claims that span ACPI _CRS records

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From: Jake Oshins <jakeo@microsoft.com>

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 <jakeo@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
---
 drivers/hv/vmbus_drv.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index f123bca..328e4c3 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1063,12 +1063,28 @@ 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)
-- 
1.7.4.1

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Thread

[PATCH 00/11] Drivers: hv: vmbus: Miscellaneous fixes and cleanup   "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
  [PATCH 02/11] Drivers: hv: vmbus: Use uuid_le type consistently "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
  [PATCH 06/11] Drivers: hv: vmbus: serialize process_chn_event() and vmbus_close_internal() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
  [PATCH 03/11] Drivers: hv: vmbus: Use the macro for comparing GUIDs "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
    Re: [PATCH 03/11] Drivers: hv: vmbus: Use the macro for comparing GUIDs Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-11-11 09:40 +0100
      RE: [PATCH 03/11] Drivers: hv: vmbus: Use the macro for comparing  GUIDs KY Srinivasan <kys@microsoft.com> - 2015-11-11 18:40 +0100
  [PATCH 05/11] Drivers: hv: vmbus: Get rid of the unused irq variable "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
  [PATCH 08/11] Drivers: hv: vmbus: fix rescind-offer handling for device without a driver "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
  [PATCH 01/11] Drivers: hv: vss: run only on supported host versions "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
    [PATCH 10/11] Drivers: hv: vmbus: channge vmbus_connection.channel_lock to mutex "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
    [PATCH 07/11] Drivers: hv: vmbus: do sanity check of channel state in vmbus_close_internal() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:30 +0100
    [PATCH 11/11] drivers:hv: Allow for MMIO claims that span ACPI _CRS records "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:40 +0100
    [PATCH 04/11] Drivers: hv: vmbus: Get rid of the unused macro "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:40 +0100
    [PATCH 09/11] Drivers: hv: vmbus: release relid on error in vmbus_process_offer() "K. Y. Srinivasan" <kys@microsoft.com> - 2015-11-11 01:40 +0100

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