1. 08 5月, 2014 3 次提交
    • A
      arm64: add support for kernel mode NEON in interrupt context · 190f1ca8
      Ard Biesheuvel 提交于
      This patch modifies kernel_neon_begin() and kernel_neon_end(), so
      they may be called from any context. To address the case where only
      a couple of registers are needed, kernel_neon_begin_partial(u32) is
      introduced which takes as a parameter the number of bottom 'n' NEON
      q-registers required. To mark the end of such a partial section, the
      regular kernel_neon_end() should be used.
      Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
      190f1ca8
    • A
      arm64: defer reloading a task's FPSIMD state to userland resume · 005f78cd
      Ard Biesheuvel 提交于
      If a task gets scheduled out and back in again and nothing has touched
      its FPSIMD state in the mean time, there is really no reason to reload
      it from memory. Similarly, repeated calls to kernel_neon_begin() and
      kernel_neon_end() will preserve and restore the FPSIMD state every time.
      
      This patch defers the FPSIMD state restore to the last possible moment,
      i.e., right before the task returns to userland. If a task does not return to
      userland at all (for any reason), the existing FPSIMD state is preserved
      and may be reused by the owning task if it gets scheduled in again on the
      same CPU.
      
      This patch adds two more functions to abstract away from straight FPSIMD
      register file saves and restores:
      - fpsimd_restore_current_state -> ensure current's FPSIMD state is loaded
      - fpsimd_flush_task_state -> invalidate live copies of a task's FPSIMD state
      Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
      005f78cd
    • A
      arm64: add abstractions for FPSIMD state manipulation · c51f9269
      Ard Biesheuvel 提交于
      There are two tacit assumptions in the FPSIMD handling code that will no longer
      hold after the next patch that optimizes away some FPSIMD state restores:
      . the FPSIMD registers of this CPU contain the userland FPSIMD state of
        task 'current';
      . when switching to a task, its FPSIMD state will always be restored from
        memory.
      
      This patch adds the following functions to abstract away from straight FPSIMD
      register file saves and restores:
      - fpsimd_preserve_current_state -> ensure current's FPSIMD state is saved
      - fpsimd_update_current_state -> replace current's FPSIMD state
      
      Where necessary, the signal handling and fork code are updated to use the above
      wrappers instead of poking into the FPSIMD registers directly.
      Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
      c51f9269
  2. 13 4月, 2014 1 次提交
  3. 12 4月, 2014 11 次提交
  4. 11 4月, 2014 9 次提交
  5. 10 4月, 2014 1 次提交
  6. 09 4月, 2014 15 次提交