1. 17 Jun, 2024 20 commits
  2. 06 Jun, 2024 1 commit
    • Lorenzo Pieralisi's avatar
      irqchip/gic-v3: Enable non-coherent redistributors/ITSes ACPI probing · ababa16f
      Lorenzo Pieralisi authored
      The GIC architecture specification defines a set of registers for
      redistributors and ITSes that control the sharebility and cacheability
      attributes of redistributors/ITSes initiator ports on the interconnect
      (GICR_[V]PROPBASER, GICR_[V]PENDBASER, GITS_BASER<n>).
      
      Architecturally the GIC provides a means to drive shareability and
      cacheability attributes signals but it is not mandatory for designs to
      wire up the corresponding interconnect signals that control the
      cacheability/shareability of transactions.
      
      Redistributors and ITSes interconnect ports can be connected to
      non-coherent interconnects that are not able to manage the
      shareability/cacheability attributes; this implicitly makes the
      redistributors and ITSes non-coherent observers.
      
      To enable non-coherent GIC designs on ACPI based systems, parse the MADT
      GICC/GICR/ITS subtables non-coherent flags to determine whether the
      respective components are non-coherent observers and force the
      shareability attributes to be programmed into the redistributors and
      ITSes registers.
      
      An ACPI global function (acpi_get_madt_revision()) is added to retrieve
      the MADT revision, in that it is essential to check the MADT revision
      before checking for flags that were added with MADT revision 7 so that
      if the kernel is booted with an ACPI MADT table with revision < 7 it
      skips parsing the newly added flags (that should be zeroed reserved
      values for MADT versions < 7 but they could turn out to be buggy and
      should be ignored).
      Signed-off-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
      Acked-by: default avatarMarc Zyngier <maz@kernel.org>
      Cc: "Rafael J. Wysocki" <rafael@kernel.org>
      Link: https://lore.kernel.org/r/20240606094238.757649-2-lpieralisi@kernel.org
      ababa16f
  3. 05 Jun, 2024 3 commits
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