On Wed, 2015-07-22 at 00:13 -0700, Ashutosh Dixit wrote:
> On Tue, Jul 21 2015 at 01:39:10 PM, Toshi Kani wrote:
> >
> > You can do the following instead. If you have the physical address
> > already
> > (i.e. the address you passed to ioremap), you can skip
> > slow_virt_to_phys().
> > pfn_t
On Tue, Jul 21 2015 at 01:39:10 PM, Toshi Kani wrote:
>
> You can do the following instead. If you have the physical address already
> (i.e. the address you passed to ioremap), you can skip slow_virt_to_phys().
> pfn_to_page() is a hack for the time being so that you can use the same
> DMA mappi
On Tue, 2015-07-21 at 14:39 -0600, Toshi Kani wrote:
> On Tue, 2015-07-21 at 08:17 -0700, Ashutosh Dixit wrote:
> > On Mon, Jul 20 2015 at 12:21:18 PM, Toshi Kani
:
> > Yes, you are correct, the 'struct page' pointer returned by
> > vmalloc_to_page does not point to a "real" struct page entry. N
On Tue, 2015-07-21 at 08:17 -0700, Ashutosh Dixit wrote:
> On Mon, Jul 20 2015 at 12:21:18 PM, Toshi Kani wrote:
> > > > Can you send me outputs of the following files? If the driver
> > > > fails to load in v4.2-rc1, you can obtain the info in v4.1.
> > > >
> > > > /proc/mtrr
> > > > /proc/
On Mon, Jul 20 2015 at 12:21:18 PM, Toshi Kani wrote:
>> > Can you send me outputs of the following files? If the driver
>> > fails to load in v4.2-rc1, you can obtain the info in v4.1.
>> >
>> > /proc/mtrr
>> > /proc/iomem
>> > /proc/vmallocinfo
>> > /sys/kernel/debug/kernel_page_tables
On Mon, 2015-07-20 at 11:33 -0700, Ashutosh Dixit wrote:
> On Mon, Jul 20 2015 at 08:59:02 AM, Toshi Kani wrote:
>
> > Can you also try the 'nohugeiomap' kernel option to the 4.2-rc1 kernel
> > to see if the problem goes away?
>
> Yes the problem goes away with 'nohugeiomap'.
>
> > Yes, vmalloc
On Mon, Jul 20 2015 at 08:59:02 AM, Toshi Kani wrote:
> Can you also try the 'nohugeiomap' kernel option to the 4.2-rc1 kernel
> to see if the problem goes away?
Yes the problem goes away with 'nohugeiomap'.
> Yes, vmalloc_to_page() assumes 4KB mappings. But ioremap with huge
> pages was enabl
On Mon, 2015-07-20 at 09:54 -0600, Toshi Kani wrote:
> On Sat, 2015-07-18 at 18:04 +, Dixit, Ashutosh wrote:
> > vmalloc_to_page with ioremap'd memory used to work correctly till
> > v4.1. In
> > v4.2-rc1 when ioremap is done using huge pages vmalloc_to_page on
> > ioremap'd
> > memory crashe
On Sat, 2015-07-18 at 18:04 +, Dixit, Ashutosh wrote:
> vmalloc_to_page with ioremap'd memory used to work correctly till
> v4.1. In
> v4.2-rc1 when ioremap is done using huge pages vmalloc_to_page on
> ioremap'd
> memory crashes. Are there plans to fix this?
>
> An example of the use of vma
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