[Nouveau] [PATCH] PCI: add prefetch quirk to work around Asus/Nvidia suspend issues

[Daniel Drake]

On Mon, Sep 3, 2018 at 8:12 PM, Mika Westerberg
<mika.westerberg at linux.intel.com> wrote:
> We have seen one similar issue with LPSS devices when BIOS assigns
> device BARs above 4G (which is not the case here) and it turned out to
> be misconfigured MTRR register or something like that. It may not be
> related at all but it could be worth a try to dump out MTRR registers of
> one of the affected systems and see if the memory areas are listed there
> (and if the attributes are somehow wrong if found).

>From Asus X542UQ:

# cat /proc/mtrr
reg00: base=0x0c0000000 ( 3072MB), size= 1024MB, count=1: uncachable
reg01: base=0x0a0000000 ( 2560MB), size=  512MB, count=1: uncachable
reg02: base=0x090000000 ( 2304MB), size=  256MB, count=1: uncachable
reg03: base=0x08c000000 ( 2240MB), size=   64MB, count=1: uncachable
reg04: base=0x08b800000 ( 2232MB), size=    8MB, count=1: uncachable

# cat /sys/kernel/debug/x86/pat_memtype_list
PAT memtype list:
write-back @ 0x84a23000-0x84a24000
write-back @ 0x8ad34000-0x8ad60000
write-back @ 0x8ad5f000-0x8ad66000
write-back @ 0x8ad5f000-0x8ad60000
write-back @ 0x8ad65000-0x8ad6a000
write-back @ 0x8ad69000-0x8ad6b000
write-back @ 0x8ad6a000-0x8ad6c000
write-back @ 0x8ad6b000-0x8ad6e000
write-back @ 0x8ad9c000-0x8ad9d000
write-back @ 0x8adce000-0x8adcf000
write-back @ 0x8adcf000-0x8add0000
write-back @ 0x8adcf000-0x8add2000
write-back @ 0x8add3000-0x8add4000
write-back @ 0x8ae04000-0x8ae05000
write-back @ 0x8b208000-0x8b209000
write-combining @ 0xc0000000-0xd0000000
write-combining @ 0xd0000000-0xe0000000
write-combining @ 0xe0000000-0xe0040000
write-combining @ 0xe0040000-0xe0050000
write-combining @ 0xe0050000-0xe0051000
write-combining @ 0xe0051000-0xe0151000
write-combining @ 0xe0151000-0xe0191000
write-combining @ 0xe0191000-0xe01a1000
write-combining @ 0xe01a1000-0xe01b1000
write-combining @ 0xe01b1000-0xe01c1000
write-combining @ 0xe01c1000-0xe01c3000
write-combining @ 0xe01c3000-0xe01c5000
write-combining @ 0xe01c5000-0xe01cd000
write-combining @ 0xe01cd000-0xe01d5000
write-combining @ 0xe01d5000-0xe01dd000
write-combining @ 0xe01dd000-0xe01e5000
write-combining @ 0xe01e5000-0xe01ed000
write-combining @ 0xe01ed000-0xe01f5000
write-combining @ 0xe01f5000-0xe01fd000
write-combining @ 0xe01fd000-0xe0205000
write-combining @ 0xe0205000-0xe020d000
write-combining @ 0xe020d000-0xe0215000
uncached-minus @ 0xed000000-0xed200000
write-combining @ 0xed800000-0xee000000
uncached-minus @ 0xee000000-0xef000000
uncached-minus @ 0xef200000-0xef400000
uncached-minus @ 0xef400000-0xef401000
uncached-minus @ 0xef404000-0xef405000
uncached-minus @ 0xef510000-0xef520000
uncached-minus @ 0xef528000-0xef52c000
uncached-minus @ 0xef533000-0xef534000
uncached-minus @ 0xef533000-0xef534000
uncached-minus @ 0xef533000-0xef534000
uncached-minus @ 0xef534000-0xef535000
uncached-minus @ 0xef534000-0xef535000
uncached-minus @ 0xef534000-0xef535000
uncached-minus @ 0xef535000-0xef536000
uncached-minus @ 0xef537000-0xef538000
uncached-minus @ 0xef538000-0xef539000
uncached-minus @ 0xef538000-0xef539000
uncached-minus @ 0xef538000-0xef539000
uncached-minus @ 0xef539000-0xef53a000
uncached-minus @ 0xef539000-0xef53a000
uncached-minus @ 0xef539000-0xef53a000
uncached-minus @ 0xef53a000-0xef53b000
uncached-minus @ 0xf0000000-0xf8000000
uncached-minus @ 0xf00e0000-0xf00e1000
uncached-minus @ 0xf0100000-0xf0101000
uncached-minus @ 0xf0101000-0xf0102000
uncached-minus @ 0xfdac0000-0xfdad0000
uncached-minus @ 0xfdae0000-0xfdaf0000
uncached-minus @ 0xfdaf0000-0xfdb00000
uncached-minus @ 0xfdc43000-0xfdc44000
uncached-minus @ 0xfe000000-0xfe001000
uncached-minus @ 0xfe000000-0xfe001000
uncached-minus @ 0xfed00000-0xfed01000
uncached-minus @ 0xfed15000-0xfed16000
uncached-minus @ 0xfed40000-0xfed41000
uncached-minus @ 0xfed90000-0xfed91000
uncached-minus @ 0xfed91000-0xfed92000

Is that the info you were looking for?

Thanks
Daniel