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From: Heyi Guo <guoheyi@huawei.com>
To: <linux-kernel@vger.kernel.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	wanghaibin 00208455 <wanghaibin.wang@huawei.com>
Subject: MSI number limit for PCI hotplug under PCI bridge on ARM platform
Date: Mon, 1 Apr 2019 21:55:52 +0800	[thread overview]
Message-ID: <327ba551-2cbd-08bb-d4c1-107c3ff7d45d@huawei.com> (raw)

Hi folks,

In current kernel implementation for ARM platform, all devices under one PCI bridge share a same device ID and the total number of MSI interrupts is fixed at the first time any child device is allocating MSI. However, this may cause failure of allocating MSI if the system supports device hot-plug under the PCI bridge, which is possible for ARM virtual machine with generic pcie-to-pci-bridge and kernel config HOTPLUG_PCI_SHPC enabled.

Does it make sense to add support for the above scenario? If it does, any suggestion for how to do that?

Thanks,

Heyi



             reply	other threads:[~2019-04-01 14:28 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-01 13:55 Heyi Guo [this message]
2019-04-02  5:00 ` Marc Zyngier
2019-04-02  9:30   ` Heyi Guo
2019-04-02 10:07     ` Marc Zyngier

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