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[ Upstream commit b0b0b8b897f8e12b2368e868bd7cdc5742d5c5a9 ] Aardvark hardware supports Multi-MSI and MSI_FLAG_MULTI_PCI_MSI is already set for the MSI chip. But when allocating MSI interrupt numbers for Multi-MSI, the numbers need to be properly aligned, otherwise endpoint devices send MSI interrupt with incorrect numbers. Fix this issue by using function bitmap_find_free_region() instead of bitmap_find_next_zero_area(). To ensure that aligned MSI interrupt numbers are used by endpoint devices, we cannot use Linux virtual irq numbers (as they are random and not properly aligned). Instead we need to use the aligned hwirq numbers. This change fixes receiving MSI interrupts on Armada 3720 boards and allows using NVMe disks which use Multi-MSI feature with 3 interrupts. Without this NVMe disks freeze booting as linux nvme-core.c is waiting 60s for an interrupt. Link: https://lore.kernel.org/r/20220110015018.26359-4-kabel@kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Marek Behún <kabel@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.