kernel/arch/powerpc/sysdev/xive/common.c, branch linux-4.16.y

Merge branch 'topic/ppc-kvm' into next

2018-01-21T11:43:43Z

Merge the topic branch we share with kvm-ppc, this brings in two xive commits, one from Paul to rework HMI handling, and a minor cleanup to drop an unused flag.

powerpc/xive: Remove incorrect debug code

2018-01-16T12:48:04Z

WORD2 if the TIMA isn't byte accessible and isn't that useful to know about, take out the pr_devel statement. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: Add interrupt flag to disable automatic EOI

2018-01-12T04:24:44Z

This will be used by KVM in order to keep escalation interrupts in the non-EOI (masked) state after they fire. They will be re-enabled directly in HW by KVM when needed. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: Clear XIVE internal structures when a CPU is removed

2017-10-04T11:01:57Z

Commit eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller") introduced support for the XIVE exploitation mode of the P9 interrupt controller on the pseries platform. At that time, support for CPU removal was not complete on PowerVM and CPU hot unplug remained untested. It appears that some cleanups of the XIVE internal structures are required before releasing the CPU, without which the kernel crashes in a RTAS call doing the CPU isolation. These changes fix the crash by deconfiguring the IPI interrupt source and clearing the event queues of the CPU when it is removed. Fixes: eac1e731b59e ("powerpc/xive: guest exploitation of the XIVE interrupt controller") Signed-off-by: Cédric Le Goater Signed-off-by: Michael Ellerman

powerpc/xive: improve debugging macros

2017-09-02T11:02:38Z

Having the CPU identifier in the debug logs is helpful when tracking issues. Also add some more logging and fix a compile issue in xive_do_source_eoi(). Signed-off-by: Cédric Le Goater Acked-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: introduce H_INT_ESB hcall

2017-09-02T11:02:37Z

The H_INT_ESB hcall() is used to issue a load or store to the ESB page instead of using the MMIO pages. This can be used as a workaround on some HW issues. The OS knows that this hcall should be used on an interrupt source when the ESB hcall flag is set to 1 in the hcall H_INT_GET_SOURCE_INFO. To maintain the frontier between the xive frontend and backend, we introduce a new xive operation 'esb_rw' to be used in the routines doing memory accesses on the ESBs. Signed-off-by: Cédric Le Goater Acked-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: introduce xive_esb_write()

2017-09-02T11:02:36Z

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: Cédric Le Goater Reviewed-by: David Gibson Acked-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: rename xive_poke_esb() in xive_esb_read()

2017-09-02T11:02:36Z

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: Cédric Le Goater Reviewed-by: David Gibson Acked-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: guest exploitation of the XIVE interrupt controller

2017-09-02T11:02:35Z

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 Acked-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman

powerpc/xive: introduce a common routine xive_queue_page_alloc()

2017-09-02T11:02:34Z

This routine will be used in the spapr backend. Also introduce a short xive_alloc_order() helper. Signed-off-by: Cédric Le Goater Reviewed-by: David Gibson Acked-by: Benjamin Herrenschmidt Signed-off-by: Michael Ellerman