1. 02 Sep, 2017 4 commits
    • Cédric Le Goater's avatar
      powerpc/xive: introduce xive_esb_write() · 99f12257
      Cédric Le Goater authored
      Some source support MMIO stores on the ESB page to perform EOI. Let's
      introduce a specific routine for this case even if this should be the
      only use of it.
      Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
      Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      99f12257
    • Cédric Le Goater's avatar
      powerpc/xive: rename xive_poke_esb() in xive_esb_read() · 59fc2724
      Cédric Le Goater authored
      xive_poke_esb() is performing a load/read so it is better named as
      xive_esb_read() as we will need to introduce a xive_esb_write()
      routine. Also use the XIVE_ESB_LOAD_EOI offset when EOI'ing LSI
      interrupts.
      Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
      Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      59fc2724
    • Cédric Le Goater's avatar
      powerpc/xive: guest exploitation of the XIVE interrupt controller · eac1e731
      Cédric Le Goater authored
      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: default avatarCédric Le Goater <clg@kaod.org>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      eac1e731
    • Cédric Le Goater's avatar
      powerpc/xive: introduce a common routine xive_queue_page_alloc() · 994ea2f4
      Cédric Le Goater authored
      This routine will be used in the spapr backend. Also introduce a short
      xive_alloc_order() helper.
      Signed-off-by: default avatarCédric Le Goater <clg@kaod.org>
      Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
      Acked-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      994ea2f4
  2. 01 Sep, 2017 36 commits