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Commit 40f26f31 authored by Jake Oshins's avatar Jake Oshins Committed by Greg Kroah-Hartman
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drivers:hv: Allow for MMIO claims that span ACPI _CRS records 



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: default avatarJake Oshins <jakeo@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d6f591e3

drivers/hv/vmbus_drv.c

+16 −0
Original line number Diff line number Diff line
@@ -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)