1. 03 6月, 2014 2 次提交
  2. 02 6月, 2014 5 次提交
  3. 01 6月, 2014 1 次提交
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      ACPICA: Tables: Add mechanism to control early table checksum verification. · 47d68c7f
      Lv Zheng 提交于
      It is reported that Linux x86 kernel cannot map large tables. The following
      large SSDT table on such platform fails to pass checksum verification and
      cannot be installed:
       ACPI: SSDT 0x00000000B9638018 07A0C4 (v02 INTEL  S2600CP  00004000 INTL 20100331)
      
      It sounds strange that in the 64-bit virtual memory address space, we
      cannot map a single ACPI table to do checksum verification. The root cause
      is:
       1. ACPICA doesn't split IO memory mapping and table mapping;
       2. Linux x86 OSL implements acpi_os_map_memory() using a size limited fix-map
          mechanism during early boot stage, which is more suitable for only IO
          mappings.
      
      ACPICA originally only mapped table header for signature validation, and
      this header mapping is required by OSL override mechanism. There was no
      checksum verification because we could not map the whole table using this
      OSL. While the following ACPICA commit enforces checksum verification by
      mapping the whole table during Linux boot stage and it finally triggers
      this issue on some platforms:
       Commit: 86dfc6f3
       Subject: ACPICA: Tables: Fix table checksums verification before installation.
      
      Before doing further cleanups for the OSL table mapping and override
      implementation, this patch introduces an option for such OSPMs to
      temporarily discard the checksum verification feature. It then can be
      re-enabled easily when the ACPICA and the underlying OSL is ready.
      
      This patch also deletes a comment around the limitation of mappings because
      it is not correct. The limitation is not how many times we can map in the
      early stage, but the OSL mapping facility may not be suitable for mapping
      the ACPI tables and thus may complain us the size limitation.
      
      The acpi_tb_verify_table() is renamed to acpi_tb_verify_temp_table() due to the
      work around added, it now only applies to the table descriptor that hasn't
      been installed and cannot be used in other cases. Lv Zheng.
      Tested-by: NYuanhan Liu <yuanhan.liu@linux.intel.com>
      Signed-off-by: NLv Zheng <lv.zheng@intel.com>
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      47d68c7f
  4. 31 5月, 2014 1 次提交
  5. 30 5月, 2014 9 次提交
  6. 29 5月, 2014 9 次提交
  7. 28 5月, 2014 13 次提交