On Tue, Apr 21, 2015 at 12:55 PM, Toshi Kani <toshi.k...@hp.com> wrote:
> On Tue, 2015-04-21 at 12:58 -0700, Dan Williams wrote:
>> On Tue, Apr 21, 2015 at 12:35 PM, Toshi Kani <toshi.k...@hp.com> wrote:
>> > On Fri, 2015-04-17 at 21:35 -0400, Dan Williams wrote:
>> > :
>> >> +
>> >> +static int nd_mem_init(struct nd_bus *nd_bus)
>> >> +{
>> >> + struct nd_spa *nd_spa;
>> >> +
>> >> + /*
>> >> + * For each SPA-DCR address range find its corresponding
>> >> + * MEMDEV(s). From each MEMDEV find the corresponding DCR.
>> >> + * Then, try to find a SPA-BDW and a corresponding BDW that
>> >> + * references the DCR. Throw it all into an nd_mem object.
>> >> + * Note, that BDWs are optional.
>> >> + */
>> >> + list_for_each_entry(nd_spa, &nd_bus->spas, list) {
>> >> + u16 spa_index = readw(&nd_spa->nfit_spa->spa_index);
>> >> + int type = nfit_spa_type(nd_spa->nfit_spa);
>> >> + struct nd_mem *nd_mem, *found;
>> >> + struct nd_memdev *nd_memdev;
>> >> + u16 dcr_index;
>> >> +
>> >> + if (type != NFIT_SPA_DCR)
>> >> + continue;
>> >
>> > This function requires NFIT_SPA_DCR, SPA Range Structure with NVDIMM
>> > Control Region GUID, for initializing an nd_mem object. However,
>> > battery-backed DIMMs do not have such control region SPA. IIUC, the
>> > NFIT spec does not require NFIT_SPA_DCR.
>> >
>> > Can you change this function to work with NFIT_SPA_PM as well?
>>
>> NFIT_SPA_PM ranges are handled separately from nd_mem_init(). See
>> nd_region_create() in patch 10.
>
> If nd_mem_init() does not initialize nd_mem objects, nd_bus_probe() in
> core.c fails in nd_bus_init_interleave_sets() and skips all subsequent
> nd_bus_xxx() calls. So, nd_region_create() won't be called.
>
> nd_bus_init_interleave_sets() fails because init_interleave_set()
> returns -ENODEV if (!nd_mem).
Ah, ok your test case is specifying PMEM backed by memory device
info. We have a test case for simple ranges (nfit_test1_setup()), but
it doesn't hit this bug because it does not specify any memory-device
tables.
Thanks, will fix this in v2 of the patch set.
> BTW, there are two nd_bus_probe() in bus.c and core.c, which is
> confusing.
Ok, will fix this as well in the v2 posting.
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