1. 20 12月, 2018 14 次提交
  2. 19 12月, 2018 19 次提交
  3. 17 12月, 2018 4 次提交
  4. 10 12月, 2018 1 次提交
  5. 09 12月, 2018 2 次提交
    • O
      powerpc/mm: Fallback to RAM if the altmap is unusable · 9ef34630
      Oliver O'Halloran 提交于
      The "altmap" is used to provide a pool of memory that is reserved for
      the vmemmap backing of hot-plugged memory. This is useful when adding
      large amount of ZONE_DEVICE memory to a system with a limited amount of
      normal memory.
      
      On ppc64 we use huge pages to map the vmemmap which requires the backing
      storage to be contigious and aligned to the hugepage size. The altmap
      implementation allows for the altmap provider to reserve a few PFNs at
      the start of the range for it's own uses and when this occurs the
      first chunk of the altmap is not usable for hugepage mappings. On hash
      there is no sane way to fall back to a normal sized page mapping so we
      fail the allocation. This results in memory hotplug failing with
      ENOMEM when the new range doesn't fall into an existing vmemmap block.
      
      This patch handles this case by falling back to using system memory
      rather than failing if we cannot allocate from the altmap. This
      fallback should only ever be used for the first vmemmap block so it
      should not cause excess memory consumption.
      
      Fixes: 7b73d978 ("mm: pass the vmem_altmap to vmemmap_populate")
      Signed-off-by: NOliver O'Halloran <oohall@gmail.com>
      Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      9ef34630
    • O
      powerpc/papr_scm: Use ibm,unit-guid as the iset cookie · 43001c52
      Oliver O'Halloran 提交于
      The interleave set cookie is used to determine if a label stored in the
      metadata space should be applied to the current region. This is
      important in the case of NVDIMMs since the firmware may change the
      interleaving configuration of a DIMM which would invalidate the existing
      labels. In our case the hypervisor hides those details from us so we
      don't really care, but libnvdimm still requires the interleave set
      cookie to be non-zero.
      
      For our purposes we just need the set cookie to be unique and fixed for
      a given PAPR SCM region and using the unit-guid (really a UUID) is fine
      for this purpose.
      
      Fixes: b5beae5e ("powerpc/pseries: Add driver for PAPR SCM regions")
      Signed-off-by: NOliver O'Halloran <oohall@gmail.com>
      [mpe: Use kernel types (u64)]
      Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
      43001c52