Messages in this thread Patch in this message | | | Subject | [PATCH 1/2] libnvdimm, pmem: fix 'pfn' support for section-misaligned namespaces | From | Dan Williams <> | Date | Mon, 29 Feb 2016 18:56:26 -0800 |
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The altmap for a section-misaligned namespace needs to arrange for the base_pfn to be section-aligned. As a result the 'reserve' region (pfns from base that do not have a struct page) must be increased. Otherwise we trip the altmap validation check in __add_pages:
if (altmap->base_pfn != phys_start_pfn || vmem_altmap_offset(altmap) > nr_pages) { pr_warn_once("memory add fail, invalid altmap\n"); return -EINVAL; }
Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/nvdimm/pmem.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-)
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index efc2a5e671c6..6a6283ab974c 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -356,6 +356,31 @@ static int nvdimm_namespace_detach_pfn(struct nd_namespace_common *ndns) return 0; } +/* + * We hotplug memory at section granularity, pad the reserved area from + * the previous section base to the namespace base address. + */ +static unsigned long init_altmap_base(resource_size_t base) +{ + unsigned long base_pfn = __phys_to_pfn(base); + +#ifdef CONFIG_SPARSEMEM + base_pfn = SECTION_ALIGN_DOWN(base_pfn); +#endif + return base_pfn; +} + +static unsigned long init_altmap_reserve(resource_size_t base) +{ + unsigned long base_pfn = __phys_to_pfn(base); + unsigned long reserve = __phys_to_pfn(SZ_8K); + +#ifdef CONFIG_SPARSEMEM + reserve += base_pfn - SECTION_ALIGN_DOWN(base_pfn); +#endif + return reserve; +} + static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns) { struct nd_namespace_io *nsio = to_nd_namespace_io(&ndns->dev); @@ -369,8 +394,8 @@ static int nvdimm_namespace_attach_pfn(struct nd_namespace_common *ndns) phys_addr_t offset; int rc; struct vmem_altmap __altmap = { - .base_pfn = __phys_to_pfn(nsio->res.start), - .reserve = __phys_to_pfn(SZ_8K), + .base_pfn = init_altmap_base(nsio->res.start), + .reserve = init_altmap_reserve(nsio->res.start), }; if (!nd_pfn->uuid || !nd_pfn->ndns)
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