On Thu, 9 Jul 2015, Jiang Liu wrote:

Recently Marc Zyngier [off-list ref] has posted a patch set at
https://lkml.org/lkml/2015/7/7/712
to enhance PCI MSI code to support generic MSI.

This is a companion patch set to refine struct msi_desc and related data
structures to support generic MSI, and it would be better to combined with
Marc's patch set.  It's also requested by
Stuart Yoder [off-list ref]

It first introduces a helper function msi_desc_to_pci_sysdata(), and
convert current PCI drivers to use helper functions to access fields
in struct msi_desc.
Then it moves msi_list from struct pci_dev into struct device and
refines struct msi_desc.
At last it moves alloc_msi_entry() into kernel/irq/msi.c for reuse.

Currently msi_desc_to_pci_sysdata() and msi_desc_to_pci_dev() are
implemented as normal functions instead of inlines to avoid header file
inclusion issue. If inlined version is preferred for performance, we could
move all of first_pci_msi_entry, for_each_pci_msi_entry, msi_desc_to_pci_dev
and msi_desc_to_pci_sysdata from linxu/kernel/msi.h into linux/kernel/pci.h.

This patch set is based on v4.2-rc1 and passes 0day test suite. You
may access the code at:
https://github.com/jiangliu/linux.git msi_desc_v1

Bjorn,

this patch series is a prerequisite for proper support of non-pci
based MSI. If there are no objections from your side, I'd like to move
it through the irq tree so we can build the non-pci MSI stuff on top.

Thanks,

	tglx