linux-kernel - Re: [PATCH] PCI: call dma_debug_add_bus for pci_bus

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Message-ID: <20180731073602.jbbcr4twd2gnkfoc@suse.de>
Date:   Tue, 31 Jul 2018 09:36:02 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, linux-pci@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linuxppc-dev@...ts.ozlabs.org,
        x86@...nel.org, linux-sh@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: call dma_debug_add_bus for pci_bus_type in common
 code

On Mon, Jul 30, 2018 at 04:17:13PM -0500, Bjorn Helgaas wrote:
> [+cc Joerg]
> 
> On Mon, Jul 30, 2018 at 09:38:42AM +0200, Christoph Hellwig wrote:
> > There is nothing arch specific about PCI or dma-debug, so move this
> > call to common code just after registering the bus type.
> 
> I assume that previously, even if the user set CONFIG_DMA_API_DEBUG=y
> we only got PCI DMA debug on powerpc, sh, and x86.  And after this
> patch, we'll get PCI DMA debug on *all* arches?
> 
> If that's true, I'll add a comment to that effect to the commitlog
> since that new functionality might be of interest to other arches.

There should be implicit support for dma-debug for all arches that use
the generic dma_ops code. The dma_debug_add_bus() function just adds the
reporting of pending dma-allocations on driver-unload for a device. 

Regards,

	Joerg