From: Baolu Lu <baolu.lu@linux.intel.com>
To: Ethan Zhao <haifeng.zhao@linux.intel.com>,
bhelgaas@google.com, robin.murphy@arm.com, jgg@ziepe.ca
Cc: baolu.lu@linux.intel.com, kevin.tian@intel.com,
dwmw2@infradead.org, will@kernel.org, lukas@wunner.de,
yi.l.liu@intel.com, dan.carpenter@linaro.org,
iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, Haorong Ye <yehaorong@bytedance.com>
Subject: Re: [PATCH v13 1/3] PCI: make pci_dev_is_disconnected() helper public for other drivers
Date: Thu, 22 Feb 2024 20:54:54 +0800 [thread overview]
Message-ID: <9c4637d5-6496-4c68-b2db-4be1e56ca746@linux.intel.com> (raw)
In-Reply-To: <20240222090251.2849702-2-haifeng.zhao@linux.intel.com>
On 2024/2/22 17:02, Ethan Zhao wrote:
> Make pci_dev_is_disconnected() public so that it can be called from
> Intel VT-d driver to quickly fix/workaround the surprise removal
> unplug hang issue for those ATS capable devices on PCIe switch downstream
> hotplug capable ports.
>
> Beside pci_device_is_present() function, this one has no config space
> space access, so is light enough to optimize the normal pure surprise
> removal and safe removal flow.
>
> Tested-by: Haorong Ye<yehaorong@bytedance.com>
> Signed-off-by: Ethan Zhao<haifeng.zhao@linux.intel.com>
> ---
> drivers/pci/pci.h | 5 -----
> include/linux/pci.h | 5 +++++
> 2 files changed, 5 insertions(+), 5 deletions(-)
Hi PCI subsystem maintainers,
The iommu drivers (including, but not limited to, the Intel VT-d driver)
require a helper to check the physical presence of a PCI device in two
scenarios:
- During the iommu_release_device() path: This ensures the device is
physically present before sending device TLB invalidation to device.
- During the device driver lifecycle when a device TLB invalidation
timeout event is generated by the IOMMU hardware: This helps handle
situations where the device might have been hot-removed.
While there may be some adjustments needed in patch 3/3, I'd like to
confirm with you whether it's feasible to expose this helper for general
use within the iommu subsystem.
If you agree with this change, I can route this patch to Linus through
the iommu tree with an "acked-by" or "reviewed-by" tag from you.
Best regards,
baolu
next prev parent reply other threads:[~2024-02-22 12:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 9:02 [PATCH v13 0/3] fix vt-d hard lockup when hotplug ATS capable device Ethan Zhao
2024-02-22 9:02 ` [PATCH v13 1/3] PCI: make pci_dev_is_disconnected() helper public for other drivers Ethan Zhao
2024-02-22 12:54 ` Baolu Lu [this message]
2024-02-23 6:47 ` Dan Carpenter
2024-02-23 7:35 ` Ethan Zhao
2024-02-26 23:05 ` Bjorn Helgaas
2024-02-29 1:58 ` Ethan Zhao
2024-02-29 22:33 ` Bjorn Helgaas
2024-03-01 2:03 ` Ethan Zhao
2024-02-29 22:26 ` Bjorn Helgaas
2024-02-22 9:02 ` [PATCH v13 2/3] iommu/vt-d: don't issue ATS Invalidation request when device is disconnected Ethan Zhao
2024-02-22 9:02 ` [PATCH v13 3/3] iommu/vt-d: improve ITE fault handling if target device isn't valid Ethan Zhao
2024-02-22 11:24 ` Dan Carpenter
2024-02-23 2:29 ` Ethan Zhao
2024-02-23 6:08 ` Dan Carpenter
2024-02-23 7:32 ` Ethan Zhao
2024-02-23 8:19 ` Dan Carpenter
2024-02-26 2:48 ` Ethan Zhao
2024-02-26 20:00 ` Ethan Zhao
2024-02-27 4:54 ` Dan Carpenter
2024-02-26 22:52 ` Bjorn Helgaas
2024-02-27 2:30 ` Ethan Zhao
2024-02-27 16:29 ` Bjorn Helgaas
2024-02-28 9:00 ` Ethan Zhao
2024-02-26 11:48 ` kernel test robot
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