linux-kernel - Re: [RFC Patch V1 00/12] Reorganize struct msi_desc to prepare for support of generic MSI

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Date:	Tue, 21 Jul 2015 10:31:29 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Stuart Yoder <stuart.yoder@...escale.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Borislav Petkov <bp@...en8.de>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC Patch V1 00/12] Reorganize struct msi_desc to prepare for
 support of generic MSI

On Thu, 9 Jul 2015, Jiang Liu wrote:
> Recently Marc Zyngier <marc.zyngier@....com> 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 <stuart.yoder@...escale.com>
> 
> 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
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