linux-kernel - Re: [PATCH v8 07/10] iommufd: Fault-capable hwpt attach/detach/replace

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Message-ID: <CABQgh9EQjEpHLn76g0Fdu7L6PwmYbiJxuPT-OSPKo7SrN7dAgQ@mail.gmail.com>
Date: Mon, 28 Oct 2024 17:56:28 +0800
From: Zhangfei Gao <zhangfei.gao@...aro.org>
To: Baolu Lu <baolu.lu@...ux.intel.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>, Joerg Roedel <joro@...tes.org>, 
	Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, 
	Jean-Philippe Brucker <jean-philippe@...aro.org>, Nicolin Chen <nicolinc@...dia.com>, 
	Yi Liu <yi.l.liu@...el.com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>, 
	Joel Granados <j.granados@...sung.com>, iommu@...ts.linux.dev, 
	virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, 
	Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
Subject: Re: [PATCH v8 07/10] iommufd: Fault-capable hwpt attach/detach/replace

On Sun, 27 Oct 2024 at 22:26, Baolu Lu <baolu.lu@...ux.intel.com> wrote:

>
> Can you please make this change a formal patch by yourself? As I don't
> have hardware in hand, I'm not confident to accurately describe the
> requirement or verify the new version during the upstream process.
>

OK, how about this one

Subject: [PATCH] iommufd: modify iommufd_fault_iopf_enable limitation

iommufd_fault_iopf_enable has limitation to PRI on PCI/SRIOV VFs
because the PRI might be a shared resource and current iommu
subsystem is not ready to support enabling/disabling PRI on a VF
without any impact on others.

However, we have devices that appear as PCI but are actually on the
AMBA bus. These fake PCI devices have PASID capability, support
stall as well as SRIOV, so remove the limitation for these devices.

Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/iommufd/fault.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommufd/fault.c b/drivers/iommu/iommufd/fault.c
index bca956d496bd..8b3e34250dae 100644
--- a/drivers/iommu/iommufd/fault.c
+++ b/drivers/iommu/iommufd/fault.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/pci.h>
+#include <linux/pci-ats.h>
 #include <linux/poll.h>
 #include <uapi/linux/iommufd.h>

@@ -27,8 +28,12 @@ static int iommufd_fault_iopf_enable(struct
iommufd_device *idev)
         * resource between PF and VFs. There is no coordination for this
         * shared capability. This waits for a vPRI reset to recover.
         */
-       if (dev_is_pci(dev) && to_pci_dev(dev)->is_virtfn)
-               return -EINVAL;
+       if (dev_is_pci(dev)) {
+               struct pci_dev *pdev = to_pci_dev(dev);
+
+               if (pdev->is_virtfn && pci_pri_supported(pdev))
+                       return -EINVAL;
+       }

        mutex_lock(&idev->iopf_lock);
        /* Device iopf has already been on. */
--

2.25.1