From: Barry Song <21cnbao@gmail.com>
To: gregkh@linuxfoundation.org, rafael@kernel.org,
bhelgaas@google.com, maz@kernel.org, tglx@linutronix.de,
linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org, linuxarm@huawei.com,
robin.murphy@arm.com, will@kernel.org, lorenzo.pieralisi@arm.com,
dwmw@amazon.co.uk, Barry Song <song.bao.hua@hisilicon.com>
Subject: [PATCH v2 0/2] msi: extend msi_irqs sysfs entries to platform devices
Date: Thu, 12 Aug 2021 22:53:39 +1200 [thread overview]
Message-ID: <20210812105341.51657-1-21cnbao@gmail.com> (raw)
From: Barry Song <song.bao.hua@hisilicon.com>
Just like pci devices have msi_irqs which can be used by userspace irq affinity
tools or applications to bind irqs, platform devices also widely support msi
irqs.
For platform devices, for example ARM SMMU, userspaces also care about its msi
irqs as applications can know the mapping between devices and irqs and then
make smarter decision on handling irq affinity. For example, for SVA mode,
it is better to pin io page fault to the numa node applications are running
on. Otherwise, io page fault will get a remote page from the node iopf happens
rather than from the node applications are running on.
The first patch extracts the sysfs populate/destory code from PCI to
MSI core. The 2nd patch lets platform-msi export msi_irqs entry so that
userspace can know the mapping between devices and irqs for platform
devices.
-v2:
extract common code for msi_irqs sysfs populate/destory from PCI to MSI core,
platform_device can directly reuse common code;
-v1:
https://lore.kernel.org/lkml/20210811105020.12980-1-song.bao.hua@hisilicon.com/
Barry Song (2):
genirq/msi: extract common sysfs populate entries to msi core from pci
platform-msi: Add ABI to show msi_irqs of platform devices
Documentation/ABI/testing/sysfs-bus-platform | 14 +++
drivers/base/platform-msi.c | 10 ++
drivers/pci/msi.c | 124 ++-----------------------
include/linux/msi.h | 4 +
kernel/irq/msi.c | 134 +++++++++++++++++++++++++++
5 files changed, 171 insertions(+), 115 deletions(-)
--
1.8.3.1
next reply other threads:[~2021-08-12 10:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 10:53 Barry Song [this message]
2021-08-12 10:53 ` [PATCH v2 1/2] genirq/msi: extract common sysfs populate entries to msi core from pci Barry Song
2021-08-12 10:53 ` [PATCH v2 2/2] platform-msi: Add ABI to show msi_irqs of platform devices Barry Song
2021-08-12 11:02 ` [PATCH v2 0/2] msi: extend msi_irqs sysfs entries to " Greg KH
2021-08-12 19:59 ` Bjorn Helgaas
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