From: Yijing Wang <wangyijing@huawei.com>
Date: Tue, 23 Sep 2014 05:27:24 +0000 (+0800)
Subject: PCI/MSI: Add "msi_bus" sysfs MSI/MSI-X control for endpoints
X-Git-Tag: omap-for-v3.19/prcm-cleanup~136^2~4^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=468ff15a3ab98ed7153c29c68229ffb97f15a251;p=pandora-kernel.git

PCI/MSI: Add "msi_bus" sysfs MSI/MSI-X control for endpoints

The "msi_bus" sysfs file for bridges sets a bus flag to allow or disallow
future driver requests for MSI or MSI-X.  Previously, the sysfs file
existed for endpoints but did nothing.

Add "msi_bus" support for endpoints, so an administrator can prevent the
use of MSI and MSI-X for individual devices.

Note that as for bridges, these changes only affect future driver requests
for MSI or MSI-X, so drivers may need to be reloaded.

Add documentation for the "msi_bus" sysfs file.

[bhelgaas: changelog, comments, add "subordinate", add endpoint printk,
rework bus_flags setting, make bus_flags printk unconditional]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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