Hi Ross,
On Fri, Jul 29, 2016 at 02:59:12PM -0600, Ross Zwisler wrote:
> The "NVDIMM Block Window Driver Writer's Guide":
>
> http://pmem.io/documents/
> http://pmem.io/documents/NVDIMM_DriverWritersGuide-July-2016.pdf
>
> defines the layout of the block window status register. For the July 2016
> version of the spec linked to above, this happens in Figure 4 on page 26.
>
> The only bits defined in this spec are bits 31, 5, 4, 2, 1 and 0. The rest
> of the bits in the status register are reserved, and there is a warning
> following the diagram that says:
>
> Note: The driver cannot assume the value of the RESERVED bits in the
> status register are zero. These reserved bits need to be masked off, and
> the driver must avoid checking the state of those bits.
>
> This change ensures that for hardware implementations that set these
> reserved bits in the status register, the driver won't incorrectly fail the
> block I/Os.
>
> Signed-off-by: Ross Zwisler <ross.zwis...@linux.intel.com>
> Cc: Dan Williams <dan.j.willi...@intel.com>
> Cc: sta...@vger.kernel.org
> ---
> drivers/acpi/nfit.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
> index 1f0e060..375c10f 100644
> --- a/drivers/acpi/nfit.c
> +++ b/drivers/acpi/nfit.c
The drivers/acpi/nfit.c is moved to drivers/acpi/nfit/core.c
> @@ -1396,11 +1396,12 @@ static u32 read_blk_stat(struct nfit_blk *nfit_blk,
> unsigned int bw)
> {
> struct nfit_blk_mmio *mmio = &nfit_blk->mmio[DCR];
> u64 offset = nfit_blk->stat_offset + mmio->size * bw;
> + const u32 STATUS_MASK = 0x80000037;
>
> if (mmio->num_lines)
> offset = to_interleave_offset(offset, mmio);
>
> - return readl(mmio->addr.base + offset);
> + return readl(mmio->addr.base + offset) & STATUS_MASK;
> }
>
> static void write_blk_ctl(struct nfit_blk *nfit_blk, unsigned int bw,
> --
> 2.9.0
Other parts are good to me.
Reviewed-by: Lee, Chun-Yi <j...@suse.com>
Regards
Joey Lee
