This is a note to let you know that I've just added the patch titled
xhci: also avoid the XHCI_ZERO_64B_REGS quirk with a passthrough iommu
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xhci-also-avoid-the-xhci_zero_64b_regs-quirk-with-a-passthrough-iommu.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ecaa4902439298f6b0e29f47424a86b310a9ff4f Mon Sep 17 00:00:00 2001
From: D Scott Phillips <scott@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 30 Mar 2023 17:30:54 +0300
Subject: xhci: also avoid the XHCI_ZERO_64B_REGS quirk with a passthrough iommu
From: D Scott Phillips <scott@xxxxxxxxxxxxxxxxxxxxxx>
commit ecaa4902439298f6b0e29f47424a86b310a9ff4f upstream.
Previously the quirk was skipped when no iommu was present. The same
rationale for skipping the quirk also applies in the iommu.passthrough=1
case.
Skip applying the XHCI_ZERO_64B_REGS quirk if the device's iommu domain is
passthrough.
Fixes: 12de0a35c996 ("xhci: Add quirk to zero 64bit registers on Renesas PCIe controllers")
Cc: stable <stable@xxxxxxxxxx>
Signed-off-by: D Scott Phillips <scott@xxxxxxxxxxxxxxxxxxxxxx>
Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230330143056.1390020-2-mathias.nyman@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -9,6 +9,7 @@
*/
#include <linux/pci.h>
+#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/irq.h>
#include <linux/log2.h>
@@ -225,6 +226,7 @@ int xhci_reset(struct xhci_hcd *xhci, u6
static void xhci_zero_64b_regs(struct xhci_hcd *xhci)
{
struct device *dev = xhci_to_hcd(xhci)->self.sysdev;
+ struct iommu_domain *domain;
int err, i;
u64 val;
u32 intrs;
@@ -243,7 +245,9 @@ static void xhci_zero_64b_regs(struct xh
* an iommu. Doing anything when there is no iommu is definitely
* unsafe...
*/
- if (!(xhci->quirks & XHCI_ZERO_64B_REGS) || !device_iommu_mapped(dev))
+ domain = iommu_get_domain_for_dev(dev);
+ if (!(xhci->quirks & XHCI_ZERO_64B_REGS) || !domain ||
+ domain->type == IOMMU_DOMAIN_IDENTITY)
return;
xhci_info(xhci, "Zeroing 64bit base registers, expecting fault\n");
Patches currently in stable-queue which might be from scott@xxxxxxxxxxxxxxxxxxxxxx are
queue-5.15/xhci-also-avoid-the-xhci_zero_64b_regs-quirk-with-a-passthrough-iommu.patch
