1. 17 Jun, 2019 37 commits
  2. 13 Jun, 2019 1 commit
  3. 05 Jun, 2019 1 commit
    • James kung's avatar
      Prevent pending G1S interrupt become G0 interrupt · acc29852
      James kung authored
      
      
      According to Arm GIC spec(IHI0069E, section 4.6.1),
      when GICD_CTLR.DS == 0, Secure Group 1 interrupts
      are treated as Group 0 by a CPU interface if:
      - The PE does not implement EL3.
      - ICC_SRE_EL1(S).SRE == 0
      
      When a cpu enter suspend or deep idle, it might be
      powered off. When the cpu resume, according to
      the GIC spec(IHI0069E, section 9.2.15, 9.2.16 and
      9.2.22) the ICC_SRE_EL1.SRE reset value is 0 (if
      write is allowed) and G0/G1S/G1NS interrupt of the
      GIC cpu interface are all disabled.
      
      If a G1S SPI interrupt occurred and the target cpu
      of the SPI is assigned to a specific cpu which is
      in suspend and is powered off, when the cpu resume
      and start to initial the GIC cpu interface, the
      initial sequence might affect the interrupt group
      type of the pending interrupt on the cpu interface.
      
      Current initial sequence on the cpu interface is:
      1. Enable G0 interrupt
      2. Enable G1S interrupt
      3. Enable ICC_SRE_EL1(S).SRE
      
      It is possible to treat the pending G1S interrupt
      as G0 interrupt on the cpu interface if the G1S
      SPI interrupt occurred between step2 and step3.
      
      To prevent the above situation happend, the initial
      sequence should be changed as follows:
      1. Enable ICC_SRE_EL1(S).SRE
      2. Enable G0 interrupt
      3. Enable G1S interrupt
      
      Change-Id: Ie34f6e0b32eb9a1677ff72571fd4bfdb5cae25b0
      Signed-off-by: default avatarJames Kung <kong1191@gmail.com>
      acc29852
  4. 23 May, 2019 1 commit