From: yunhua li <yunhual@gmail.com>
To: linux-usb@vger.kernel.org
Subject: Per USB device interrupt handler for xhci
Date: Fri, 5 Jul 2019 19:50:28 -0700 [thread overview]
Message-ID: <CAMqbrUg3bz=i8nh4W2-NWOsnQdqcaB3nvZnMJQ1sGXuD0ogk7Q@mail.gmail.com> (raw)
Hi all
xhci_msi_irq is the interrupt handler for xhci, the controller it self
is a PCI device, on my system it is a Intel chip. I have multiple USB
device connect to this USB host controller, xhci_msi_irq is interrupt
handler for the PCI device(USB Host controller).
Is it possible to have multiple IRQ, and different IRQ for different
USB device? If so how? the chip(USB Host controller) should know which
USB device’s transaction,
When the chip decide to assert an interrupt, it should be a reason for
a specified USB device, then assert a correspondence MSI interrupt.
Thanks.
sudo lspci -s 00:14.0 -v
00:14.0 USB controller: Intel Corporation Device a2af (prog-if 30 [XHCI])
Subsystem: Dell Device 0738
Flags: bus master, medium devsel, latency 0, IRQ 29
Memory at 38003ff10000 (64-bit, non-prefetchable) [size=64K]
Capabilities: [70] Power Management version 2
Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
Kernel driver in use: xhci_hcd
Regards
next reply other threads:[~2019-07-06 2:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-06 2:50 yunhua li [this message]
2019-07-06 4:46 ` Per USB device interrupt handler for xhci Greg KH
2019-07-08 19:58 ` yunhua li
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