On 2024-06-05 08:14, Lorenzo Pieralisi wrote:
On Mon, Apr 22, 2024 at 10:42:19AM +0200, Lorenzo Pieralisi wrote:
On Tue, Jan 23, 2024 at 12:03:32PM +0100, Lorenzo Pieralisi wrote:
> 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: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
> Cc: Robin Murphy <robin.murphy@xxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
> Cc: Marc Zyngier <maz@xxxxxxxxxx>
> ---
> drivers/acpi/processor_core.c | 15 +++++++++++++++
> drivers/irqchip/irq-gic-v3-its.c | 4 ++++
> drivers/irqchip/irq-gic-v3.c | 9 +++++++++
> include/linux/acpi.h | 3 +++
> 4 files changed, 31 insertions(+)
Hi Marc, Rafael,
I would kindly ask you please what to do with this patch, it still
applies to v6.9-rc5 - I can resend it if needed, ACPICA changes
are already merged as-per the cover letter.
Hi Marc, Rafael,
I would kindly ask please what to do with this patch, rebased to
v6.10-rc1,
I can resend it if that's preferred, please let me know.
Please resend it with my:
Acked-by: Marc Zyngier <maz@xxxxxxxxxx>
and Cc'ing Thomas Gleixner.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
