linux/arch/powerpc/platforms
Cédric Le Goater eac1e731b5 powerpc/xive: guest exploitation of the XIVE interrupt controller
This is the framework for using XIVE in a PowerVM guest. The support
is very similar to the native one in a much simpler form.

Each source is associated with an Event State Buffer (ESB). This is a
two bit state machine which is used to trigger events. The bits are
named "P" (pending) and "Q" (queued) and can be controlled by MMIO.
The Guest OS registers event (or notifications) queues on which the HW
will post event data for a target to notify.

Instead of OPAL calls, a set of Hypervisors call are used to configure
the interrupt sources and the event/notification queues of the guest:

 - H_INT_GET_SOURCE_INFO

   used to obtain the address of the MMIO page of the Event State
   Buffer (PQ bits) entry associated with the source.

 - H_INT_SET_SOURCE_CONFIG

   assigns a source to a "target".

 - H_INT_GET_SOURCE_CONFIG

   determines to which "target" and "priority" is assigned to a source

 - H_INT_GET_QUEUE_INFO

   returns the address of the notification management page associated
   with the specified "target" and "priority".

 - H_INT_SET_QUEUE_CONFIG

   sets or resets the event queue for a given "target" and "priority".
   It is also used to set the notification config associated with the
   queue, only unconditional notification for the moment.  Reset is
   performed with a queue size of 0 and queueing is disabled in that
   case.

 - H_INT_GET_QUEUE_CONFIG

   returns the queue settings for a given "target" and "priority".

 - H_INT_RESET

   resets all of the partition's interrupt exploitation structures to
   their initial state, losing all configuration set via the hcalls
   H_INT_SET_SOURCE_CONFIG and H_INT_SET_QUEUE_CONFIG.

 - H_INT_SYNC

   issue a synchronisation on a source to make sure sure all
   notifications have reached their queue.

As for XICS, the XIVE interface for the guest is described in the
device tree under the "interrupt-controller" node. A couple of new
properties are specific to XIVE :

 - "reg"

   contains the base address and size of the thread interrupt
   managnement areas (TIMA), also called rings, for the User level and
   for the Guest OS level. Only the Guest OS level is taken into
   account today.

 - "ibm,xive-eq-sizes"

   the size of the event queues. One cell per size supported, contains
   log2 of size, in ascending order.

 - "ibm,xive-lisn-ranges"

   the interrupt numbers ranges assigned to the guest. These are
   allocated using a simple bitmap.

and also :

 - "/ibm,plat-res-int-priorities"

   contains a list of priorities that the hypervisor has reserved for
   its own use.

Tested with a QEMU XIVE model for pseries and with the Power hypervisor.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-09-02 21:02:35 +10:00
..
4xx powerpc/4xx: Constify cpm_suspend_ops 2017-08-31 19:56:33 +10:00
8xx powerpc/8xx: Fix two CONFIG_8xx left behind 2017-08-14 21:57:33 +10:00
40x powerpc updates for 4.10 2016-12-16 09:26:42 -08:00
44x powerpc/44x: Move 44x machine check handlers into platforms/44x 2017-08-10 23:31:24 +10:00
52xx powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
82xx powerpc/e8248e: Select PHYLIB only if NETDEVICES is enabled 2016-09-24 23:59:47 -05:00
83xx powerpc/83xx: Use sizeof correct type when ioremapping 2017-08-31 14:26:05 +10:00
85xx powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
86xx powerpc: Add struct smp_ops_t.cause_nmi_ipi operation 2017-04-28 21:02:25 +10:00
512x powerpc/512x: Constify clk_div_tables 2017-08-31 14:26:06 +10:00
amigaone powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
cell powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
chrp powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
embedded6xx powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
maple powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
pasemi powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
powermac powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
powernv powerpc/powernv/npu: Move tlb flush before launching ATSD 2017-09-01 16:42:55 +10:00
ps3 powerpc: Squash lines for simple wrapper functions 2017-08-31 14:26:42 +10:00
pseries powerpc/xive: guest exploitation of the XIVE interrupt controller 2017-09-02 21:02:35 +10:00
fsl_uli1575.c of/irq: Refactor interrupt-map parsing 2013-10-24 11:43:04 +01:00
Kconfig powerpc/book3s64: Move PPC_DT_CPU_FTRs and enable it by default 2017-06-08 20:42:57 +10:00
Kconfig.cputype powerpc/8xx: remove CONFIG_8xx 2017-08-10 23:32:17 +10:00
Makefile powerpc/4xx: Create 4xx pseudo-platform in platforms/4xx 2017-08-10 23:31:30 +10:00