linux-kernel - Re: [PATCH v3 3/4] sh/PCI: Pass GAPSPCI_DMA_BASE CPU & bus address to dma_declare_coherent

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Date:	Mon, 26 May 2014 17:33:28 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joerg Roedel <joro@...tes.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Liviu Dudau <Liviu.Dudau@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	James Bottomley <jbottomley@...allels.com>,
	Magnus Damm <damm@...nsource.se>,
	linux-pci <linux-pci@...r.kernel.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH v3 3/4] sh/PCI: Pass GAPSPCI_DMA_BASE CPU & bus address to dma_declare_coherent_memory()

On Mon, May 26, 2014 at 8:46 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> On Thu, May 8, 2014 at 10:49 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>> --- a/arch/sh/drivers/pci/fixups-dreamcast.c
>> +++ b/arch/sh/drivers/pci/fixups-dreamcast.c
>> @@ -31,6 +31,8 @@
>>  static void gapspci_fixup_resources(struct pci_dev *dev)
>>  {
>>         struct pci_channel *p = dev->sysdata;
>> +       struct resource res;
>> +       struct pci_bus_region region;
>>
>>         printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev));
>>
>> @@ -50,11 +52,21 @@ static void gapspci_fixup_resources(struct pci_dev *dev)
>>
>>                 /*
>>                  * Redirect dma memory allocations to special memory window.
>> +                *
>> +                * If this GAPSPCI region were mapped by a BAR, the CPU
>> +                * phys_addr_t would be pci_resource_start(), and the bus
>> +                * address would be pci_bus_address(pci_resource_start()).
>> +                * But apparently there's no BAR mapping it, so we just
>> +                * "know" its CPU address is GAPSPCI_DMA_BASE.
>>                  */
>> +               res.start = GAPSPCI_DMA_BASE;
>> +               res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1;
>> +               res.flags = IORESOURCE_MEM;
>> +               pcibios_resource_to_bus(dev, &region, &resource);
>
> In response to http://kisskb.ellerman.id.au/kisskb/buildresult/11212250/
>
> | /scratch/kisskb/src/arch/sh/drivers/pci/fixups-dreamcast.c: In
> function 'gapspci_fixup_resources':
> | /scratch/kisskb/src/arch/sh/drivers/pci/fixups-dreamcast.c:65:42:
> error: 'resource' undeclared (first use in this function)
> | /scratch/kisskb/src/arch/sh/drivers/pci/fixups-dreamcast.c:65:42:
> note: each undeclared identifier is reported only once for each
> function it appears in
>
> "resource" seem to have been replaced by "res", but this warning still happens:
>
> | /scratch/kisskb/src/arch/sh/drivers/pci/fixups-dreamcast.c:65:3:
> warning: passing argument 1 of 'pcibios_resource_to_bus' from
> incompatible pointer type [enabled by default]
> | /scratch/kisskb/src/include/linux/pci.h:737:6: note: expected
> 'struct pci_bus *' but argument is of type 'struct pci_dev *'

Sheesh, this really has not been my day.  Fixed, thanks.

>>                 BUG_ON(!dma_declare_coherent_memory(&dev->dev,
>> -                                               GAPSPCI_DMA_BASE,
>> -                                               GAPSPCI_DMA_BASE,
>> -                                               GAPSPCI_DMA_SIZE,
>> +                                               res.start,
>> +                                               region.start,
>> +                                               resource_size(&res),
>>                                                 DMA_MEMORY_MAP |
>>                                                 DMA_MEMORY_EXCLUSIVE));
>>                 break;
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
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