lkml.org 
[lkml]   [2014]   [Mar]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 3/3] arm64: Add architecture support for PCI
On Tue, Mar 04, 2014 at 10:28:51PM +0000, Arnd Bergmann wrote:
> On Tuesday 04 March 2014, Liviu Dudau wrote:
>
> > +extern int isa_dma_bridge_buggy;
>
> As commented before, I still think we can hardcode this to off

Unfortunately that doesn't work when you have CONFIG_PCI=y. drivers/pci/pci.c has:

drivers/pci/pci.c:int isa_dma_bridge_buggy;
drivers/pci/pci.c:EXPORT_SYMBOL(isa_dma_bridge_buggy);

and drivers/pci/quirks.c does:

drivers/pci/quirks.c: if (!isa_dma_bridge_buggy) {
drivers/pci/quirks.c: isa_dma_bridge_buggy=1;
drivers/pci/quirks.c- dev_info(&dev->dev, "Activating ISA DMA hang workarounds\n");
drivers/pci/quirks.c- }


>
> > +unsigned long pci_address_to_pio(phys_addr_t address)
> > +{
> > + struct ioresource *res;
> > +
> > + list_for_each_entry(res, &io_list, list) {
> > + if (address >= res->start &&
> > + address < res->start + res->size) {
> > + return res->start - address;
> > + }
> > + }
> > +
> > + return (unsigned long)-1;
> > +}
> > +EXPORT_SYMBOL_GPL(pci_address_to_pio);
>
> This has two problems:
>
> - You return the address in bus space not the logical Linux
> port number as powerpc and microblaze do.
> - You imply that the window starts at bus address zero, which
> might not be the case.

That's definitely not the intention here. I want to return the
logical port number and I want that port number to start from
zero for every registered IO range.

>
> > +EXPORT_SYMBOL(pcibios_fixup_bus);
>
> no need for this export.

OK.

>
> > +/*
> > + * We don't have to worry about legacy ISA devices, so nothing to do here
> > + */
> > +resource_size_t pcibios_align_resource(void *data, const struct resource *res,
> > + resource_size_t size, resource_size_t align)
> > +{
> > + return ALIGN(res->start, align);
> > +}
> > +EXPORT_SYMBOL(pcibios_align_resource);
>
> or this one. Also, the ALIGN() is already done by the PCI core.

This has been fix in v6 already.

Thanks for reviewing this!

Liviu

>
> Arnd
>

--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-03-06 18:21    [W:0.100 / U:0.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site