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    Subject[PATCH V2 11/12] drivers:hv: Allow for MMIO claims that span ACPI _CRS records
    Date
    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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