1. 13 Jan, 2018 1 commit
  2. 12 Jan, 2018 1 commit
  3. 08 Jan, 2018 13 commits
  4. 05 Jan, 2018 2 commits
    • Dongjiu Geng's avatar
      arm64: v8.4: Support for new floating point multiplication instructions · 3b3b6810
      Dongjiu Geng authored
      
      
      ARM v8.4 extensions add new neon instructions for performing a
      multiplication of each FP16 element of one vector with the corresponding
      FP16 element of a second vector, and to add or subtract this without an
      intermediate rounding to the corresponding FP32 element in a third vector.
      
      This patch detects this feature and let the userspace know about it via a
      HWCAP bit and MRS emulation.
      
      Cc: Dave Martin <Dave.Martin@arm.com>
      Reviewed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
      Signed-off-by: default avatarDongjiu Geng <gengdongjiu@huawei.com>
      Reviewed-by: default avatarDave Martin <Dave.Martin@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      3b3b6810
    • Catalin Marinas's avatar
      arm64: asid: Do not replace active_asids if already 0 · a8ffaaa0
      Catalin Marinas authored
      Under some uncommon timing conditions, a generation check and
      xchg(active_asids, A1) in check_and_switch_context() on P1 can race with
      an ASID roll-over on P2. If P2 has not seen the update to
      active_asids[P1], it can re-allocate A1 to a new task T2 on P2. P1 ends
      up waiting on the spinlock since the xchg() returned 0 while P2 can go
      through a second ASID roll-over with (T2,A1,G2) active on P2. This
      roll-over copies active_asids[P1] == A1,G1 into reserved_asids[P1] and
      active_asids[P2] == A1,G2 into reserved_asids[P2]. A subsequent
      scheduling of T1 on P1 and T2 on P2 would match reserved_asids and get
      their generation bumped to G3:
      
      P1					P2
      --                                      --
      TTBR0.BADDR = T0
      TTBR0.ASID = A0
      asid_generation = G1
      check_and_switch_context(T1,A1,G1)
        generation match
      					check_and_switch_context(T2,A0,G0)
       				          new_context()
      					    ASID roll-over
      					    asid_generation = G2
      					    flush_context()
      					      active_asids[P1] = 0
      					      asid_map[A1] = 0
      					      reserved_asids[P1] = A0,G0
        xchg(active_asids, A1)
          active_asids[P1] = A1,G1
          xchg returns 0
        spin_lock_irqsave()
      					    allocated ASID (T2,A1,G2)
      					    asid_map[A1] = 1
      					  active_asids[P2] = A1,G2
      					...
      					check_and_switch_context(T3,A0,G0)
      					  new_context()
      					    ASID roll-over
      					    asid_generation = G3
      					    flush_context()
      					      active_asids[P1] = 0
      					      asid_map[A1] = 1
      					      reserved_asids[P1] = A1,G1
      					      reserved_asids[P2] = A1,G2
      					    allocated ASID (T3,A2,G3)
      					    asid_map[A2] = 1
      					  active_asids[P2] = A2,G3
        new_context()
          check_update_reserved_asid(A1,G1)
            matches reserved_asid[P1]
            reserved_asid[P1] = A1,G3
        updated T1 ASID to (T1,A1,G3)
      					check_and_switch_context(T2,A1,G2)
      					  new_context()
      					    check_and_switch_context(A1,G2)
      					      matches reserved_asids[P2]
      					      reserved_asids[P2] = A1,G3
      					  updated T2 ASID to (T2,A1,G3)
      
      At this point, we have two tasks, T1 and T2 both using ASID A1 with the
      latest generation G3. Any of them is allowed to be scheduled on the
      other CPU leading to two different tasks with the same ASID on the same
      CPU.
      
      This patch changes the xchg to cmpxchg so that the active_asids is only
      updated if non-zero to avoid a race with an ASID roll-over on a
      different CPU.
      
      The ASID allocation algorithm has been formally verified using the TLA+
      model checker (see
      https://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/kernel-tla.git/tree/asidalloc.tla
      
      
      for the spec).
      Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      a8ffaaa0
  5. 02 Jan, 2018 11 commits
  6. 22 Dec, 2017 9 commits
  7. 11 Dec, 2017 3 commits