diff mbox series

[09/11] xhci: Fix TRB prefetch issue of ZHAOXIN hosts

Message ID 20230602144009.1225632-10-mathias.nyman@linux.intel.com
State New
Headers show
Series xhci features for usb-next | expand

Commit Message

Mathias Nyman June 2, 2023, 2:40 p.m. UTC 
From: Weitao Wang <WeitaoWang-oc@zhaoxin.com>

On some ZHAOXIN hosts, 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 a segment and only the first
page will be used. And add a quirk XHCI_ZHAOXIN_TRB_FETCH for this issue.

Cc: stable@vger.kernel.org
Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci-mem.c | 8 ++++++--
 drivers/usb/host/xhci-pci.c | 7 ++++++-
 drivers/usb/host/xhci.h     | 1 +
 3 files changed, 13 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index a8e9a4bb1537..c4170421bc9c 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -2345,8 +2345,12 @@  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 * 2, TRB_SEGMENT_SIZE * 2, xhci->page_size * 2);
+	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,
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 2103c6c0a967..3aad946bab68 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -522,8 +522,13 @@  static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
 		xhci->quirks |= XHCI_NO_SOFT_RETRY;
 
 	if (pdev->vendor == PCI_VENDOR_ID_ZHAOXIN) {
-		if (pdev->device == 0x9202)
+		if (pdev->device == 0x9202) {
 			xhci->quirks |= XHCI_RESET_ON_RESUME;
+			xhci->quirks |= XHCI_ZHAOXIN_TRB_FETCH;
+		}
+
+		if (pdev->device == 0x9203)
+			xhci->quirks |= XHCI_ZHAOXIN_TRB_FETCH;
 	}
 
 	/* xHC spec requires PCI devices to support D3hot and D3cold */
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 456e1c8ca005..5a495126c8ba 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1904,6 +1904,7 @@  struct xhci_hcd {
 #define XHCI_EP_CTX_BROKEN_DCS	BIT_ULL(42)
 #define XHCI_SUSPEND_RESUME_CLKS	BIT_ULL(43)
 #define XHCI_RESET_TO_DEFAULT	BIT_ULL(44)
+#define XHCI_ZHAOXIN_TRB_FETCH	BIT_ULL(45)
 
 	unsigned int		num_active_eps;
 	unsigned int		limit_active_eps;