On Thu, Oct 1, 2020 at 11:17 AM Ralph Campbell wrote:
>
> This is still an RFC because after looking at the pmem/dax code some
> more, I realized that the ZONE_DEVICE struct pages are being inserted
> into the process' page tables with vmf_insert_mixed() and a zero
> refcount on the ZONE_DEVICE st
On Thu, Oct 01, 2020 at 11:17:13AM -0700, Ralph Campbell wrote:
> This is still an RFC because after looking at the pmem/dax code some
> more, I realized that the ZONE_DEVICE struct pages are being inserted
> into the process' page tables with vmf_insert_mixed() and a zero
> refcount on the ZONE_DE
On 10/1/20 10:59 PM, Christoph Hellwig wrote:
On Thu, Oct 01, 2020 at 11:17:15AM -0700, Ralph Campbell wrote:
ZONE_DEVICE struct pages have an extra reference count that complicates the
code for put_page() and several places in the kernel that need to check the
reference count to see that a pa
On 10/1/20 10:56 PM, Christoph Hellwig wrote:
On Thu, Oct 01, 2020 at 11:17:14AM -0700, Ralph Campbell wrote:
There are several places where ZONE_DEVICE struct pages assume a reference
count == 1 means the page is idle and free. Instead of open coding this,
add a helper function to hide this
Previously the code relied on device->pri to be NULL and to fail probing
later. We really should just return an error inside nvkm_device_ctor for
unsupported GPUs.
Fixes: 24d5ff40a732 ("drm/nouveau/device: rework mmio mapping code to get rid
of second map")
Signed-off-by: Karol Herbst
Cc: dann
