spapr_events: re-use EPOW event infrastructure for hotplug events

This extends the data structures currently used to report EPOW events to
guests via the check-exception RTAS interfaces to also include event types
for hotplug/unplug events.

This is currently undocumented and being finalized for inclusion in PAPR
specification, but we implement this here as an extension for guest
userspace tools to implement (existing guest kernels simply log these
events via a sysfs interface that's read by rtas_errd, and current
versions of rtas_errd/powerpc-utils already support the use of this
mechanism for initiating hotplug operations).

We also add support for queues of pending RTAS events, since in the
case of hotplug there's chance for multiple events being in-flight
at any point in time.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 13 insertions, 1 deletions

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 8622193..71b3e08 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -3,11 +3,13 @@
 
 #include "sysemu/dma.h"
 #include "hw/ppc/xics.h"
+#include "hw/ppc/spapr_drc.h"
 
 struct VIOsPAPRBus;
 struct sPAPRPHBState;
 struct sPAPRNVRAM;
 typedef struct sPAPRConfigureConnectorState sPAPRConfigureConnectorState;
+typedef struct sPAPREventLogEntry sPAPREventLogEntry;
 
 #define HPTE64_V_HPTE_DIRTY     0x0000000000000040ULL
 
@@ -32,8 +34,9 @@ typedef struct sPAPREnvironment {
     struct PPCTimebase tb;
     bool has_graphics;
 
-    uint32_t epow_irq;
+    uint32_t check_exception_irq;
     Notifier epow_notifier;
+    QTAILQ_HEAD(, sPAPREventLogEntry) pending_events;
 
     /* Migration state */
     int htab_save_index;
@@ -533,6 +536,13 @@ struct sPAPRTCETable {
 };
 
 sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn);
+
+struct sPAPREventLogEntry {
+    int log_type;
+    void *data;
+    QTAILQ_ENTRY(sPAPREventLogEntry) next;
+};
+
 void spapr_events_init(sPAPREnvironment *spapr);
 void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq);
 int spapr_h_cas_compose_response(target_ulong addr, target_ulong size);
@@ -547,6 +557,8 @@ int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
                       sPAPRTCETable *tcet);
 void spapr_pci_switch_vga(bool big_endian);
+void spapr_hotplug_req_add_event(sPAPRDRConnector *drc);
+void spapr_hotplug_req_remove_event(sPAPRDRConnector *drc);
 
 /* rtas-configure-connector state */
 struct sPAPRConfigureConnectorState {