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authorJake Oshins <jakeo@microsoft.com>2016-04-05 10:22:56 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 14:01:37 -0700
commitea37a6b8a0b9fbe3f85b4b9da3206c28f1de6f8e (patch)
tree1d7bce488a552f6e2efc21a7953f8d2647955b65 /drivers/hv/vmbus_drv.c
parent6d146aefbaa5c5dff0c2e9d81e90e5112ded284e (diff)
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drivers:hv: Separate out frame buffer logic when picking MMIO range
Simplify the logic that picks MMIO ranges by pulling out the logic related to trying to lay frame buffer claim on top of where the firmware placed the frame buffer. Signed-off-by: Jake Oshins <jakeo@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
-rw-r--r--drivers/hv/vmbus_drv.c80
1 files changed, 35 insertions, 45 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index eaa5c3b7fd8a..a29a6c0abc01 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1162,64 +1162,54 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
bool fb_overlap_ok)
{
struct resource *iter, *shadow;
- resource_size_t range_min, range_max, start, local_min, local_max;
+ resource_size_t range_min, range_max, start;
const char *dev_n = dev_name(&device_obj->device);
- u32 fb_end = screen_info.lfb_base + (screen_info.lfb_size << 1);
- int i, retval;
+ int retval;
retval = -ENXIO;
down(&hyperv_mmio_lock);
+ /*
+ * If overlaps with frame buffers are allowed, then first attempt to
+ * make the allocation from within the reserved region. Because it
+ * is already reserved, no shadow allocation is necessary.
+ */
+ if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) &&
+ !(max < fb_mmio->start)) {
+
+ range_min = fb_mmio->start;
+ range_max = fb_mmio->end;
+ start = (range_min + align - 1) & ~(align - 1);
+ for (; start + size - 1 <= range_max; start += align) {
+ *new = request_mem_region_exclusive(start, size, dev_n);
+ if (*new) {
+ retval = 0;
+ goto exit;
+ }
+ }
+ }
+
for (iter = hyperv_mmio; iter; iter = iter->sibling) {
if ((iter->start >= max) || (iter->end <= min))
continue;
range_min = iter->start;
range_max = iter->end;
-
- /* If this range overlaps the frame buffer, split it into
- two tries. */
- for (i = 0; i < 2; i++) {
- local_min = range_min;
- local_max = range_max;
- if (fb_overlap_ok || (range_min >= fb_end) ||
- (range_max <= screen_info.lfb_base)) {
- i++;
- } else {
- if ((range_min <= screen_info.lfb_base) &&
- (range_max >= screen_info.lfb_base)) {
- /*
- * The frame buffer is in this window,
- * so trim this into the part that
- * preceeds the frame buffer.
- */
- local_max = screen_info.lfb_base - 1;
- range_min = fb_end;
- } else {
- range_min = fb_end;
- continue;
- }
+ start = (range_min + align - 1) & ~(align - 1);
+ for (; start + size - 1 <= range_max; start += align) {
+ shadow = __request_region(iter, start, size, NULL,
+ IORESOURCE_BUSY);
+ if (!shadow)
+ continue;
+
+ *new = request_mem_region_exclusive(start, size, dev_n);
+ if (*new) {
+ shadow->name = (char *)*new;
+ retval = 0;
+ goto exit;
}
- start = (local_min + align - 1) & ~(align - 1);
- for (; start + size - 1 <= local_max; start += align) {
- shadow = __request_region(iter, start,
- size,
- NULL,
- IORESOURCE_BUSY);
- if (!shadow)
- continue;
-
- *new = request_mem_region_exclusive(start, size,
- dev_n);
- if (*new) {
- shadow->name = (char *)*new;
- retval = 0;
- goto exit;
- }
-
- __release_region(iter, start, size);
- }
+ __release_region(iter, start, size);
}
}