linux-kernel - Re: [PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller

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Date:	Mon, 8 Feb 2016 10:53:22 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	tglx@...utronix.de, jason@...edaemon.net, tsahee@...apurnalabs.com,
	rshitrit@...apurnalabs.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] irqchip: add the Alpine MSIX interrupt controller

Hello Marc,

On Mon, 8 Feb 2016 09:44:49 +0000, Marc Zyngier wrote:

> > +static struct msi_domain_info alpine_msix_domain_info = {
> > +	.flags	= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
> > +		  MSI_FLAG_PCI_MSIX,
> 
> You can probably add MSI_FLAG_PCI_MSI, it should work as well (MULTI_MSI
> obviously won't).

Why wouldn't MULTI_MSI work? The code is using
bitmap_find_next_zero_area() in alpine_msix_allocate_sgi() precisely to
find num_req consecutive bits set to 0, in order to allocate multiple
MSIs at once. Am I missing something?

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com