diff mbox series

[v3,2/4] xhci: fix issue of cross page boundary in TRB prefetch

Message ID 20230506201536.7362-3-WeitaoWang-oc@zhaoxin.com (mailing list archive)
State New, archived
Headers show
Series Fix some issues of xHCI for zhaoxin | expand

Commit Message

Weitao Wang May 6, 2023, 8:15 p.m. UTC 
On some Zhaoxin platforms, xHCI will prefetch TRB for performance
improvement. However this TRB prefetch mechanism may cross page boundary,
which may access memory not allocated by xHCI driver. In order to fix
this issue, two pages was allocated for TRB and only the first
page will be used.

Cc: stable@vger.kernel.org
Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
---
 drivers/usb/host/xhci-mem.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 7e106bd804ca..6d00980d0070 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2352,8 +2352,12 @@  int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags)
 	 * and our use of dma addresses in the trb_address_map radix tree needs
 	 * TRB_SEGMENT_SIZE alignment, so we pick the greater alignment need.
 	 */
-	xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
-			TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, xhci->page_size);
+	if (xhci->quirks & XHCI_ZHAOXIN_TRB_FETCH)
+		xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
+				TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, xhci->page_size);
+	else
+		xhci->segment_pool = dma_pool_create("xHCI ring segments", dev,
+				TRB_SEGMENT_SIZE, TRB_SEGMENT_SIZE, xhci->page_size);
 
 	/* See Table 46 and Note on Figure 55 */
 	xhci->device_pool = dma_pool_create("xHCI input/output contexts", dev,