[Qemu-devel] [PATCH v4 05/26] ppc/xics: store the ICS object under the sPAPR machine

["Cédric Le Goater" <clg@kaod.org>]

A list of ICS objects was introduced under the XICS object for the
PowerNV machine but, for the sPAPR machine, it brings extra complexity
as there is only a single ICS. To simplify the code, let's add the ICS
pointer under the sPAPR machine and try to reduce the use of this list
where possible.

Also, change the xics_spapr_*() routines to use an ICS object instead
of an XICSState and change their name to reflect that these are
specific to the sPAPR ICS object.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---

 Changes since v3:

 - assigned spapr->ics at the end of try_create_xics()

 hw/intc/xics_spapr.c   | 22 +++++++++-------------
 hw/ppc/spapr.c         | 14 +++++++++-----
 hw/ppc/spapr_events.c  |  4 ++--
 hw/ppc/spapr_pci.c     |  8 ++++----
 hw/ppc/spapr_vio.c     |  2 +-
 include/hw/ppc/spapr.h |  1 +
 include/hw/ppc/xics.h  |  6 +++---
 7 files changed, 29 insertions(+), 28 deletions(-)

diff --git a/hw/intc/xics_spapr.c b/hw/intc/xics_spapr.c
index 859b5675e175..1501e796e5e0 100644
--- a/hw/intc/xics_spapr.c
+++ b/hw/intc/xics_spapr.c
@@ -118,7 +118,7 @@ static void rtas_set_xive(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                           uint32_t nargs, target_ulong args,
                           uint32_t nret, target_ulong rets)
 {
-    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
+    ICSState *ics = spapr->ics;
     uint32_t nr, srcno, server, priority;
 
     if ((nargs != 3) || (nret != 1)) {
@@ -151,7 +151,7 @@ static void rtas_get_xive(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                           uint32_t nargs, target_ulong args,
                           uint32_t nret, target_ulong rets)
 {
-    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
+    ICSState *ics = spapr->ics;
     uint32_t nr, srcno;
 
     if ((nargs != 1) || (nret != 3)) {
@@ -181,7 +181,7 @@ static void rtas_int_off(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                          uint32_t nargs, target_ulong args,
                          uint32_t nret, target_ulong rets)
 {
-    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
+    ICSState *ics = spapr->ics;
     uint32_t nr, srcno;
 
     if ((nargs != 1) || (nret != 1)) {
@@ -212,7 +212,7 @@ static void rtas_int_on(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                         uint32_t nargs, target_ulong args,
                         uint32_t nret, target_ulong rets)
 {
-    ICSState *ics = QLIST_FIRST(&spapr->xics->ics);
+    ICSState *ics = spapr->ics;
     uint32_t nr, srcno;
 
     if ((nargs != 1) || (nret != 1)) {
@@ -294,9 +294,8 @@ static int ics_find_free_block(ICSState *ics, int num, int alignnum)
     return -1;
 }
 
-int xics_spapr_alloc(XICSState *xics, int irq_hint, bool lsi, Error **errp)
+int spapr_ics_alloc(ICSState *ics, int irq_hint, bool lsi, Error **errp)
 {
-    ICSState *ics = QLIST_FIRST(&xics->ics);
     int irq;
 
     if (!ics) {
@@ -327,10 +326,9 @@ int xics_spapr_alloc(XICSState *xics, int irq_hint, bool lsi, Error **errp)
  * Allocate block of consecutive IRQs, and return the number of the first IRQ in
  * the block. If align==true, aligns the first IRQ number to num.
  */
-int xics_spapr_alloc_block(XICSState *xics, int num, bool lsi, bool align,
-                           Error **errp)
+int spapr_ics_alloc_block(ICSState *ics, int num, bool lsi,
+                          bool align, Error **errp)
 {
-    ICSState *ics = QLIST_FIRST(&xics->ics);
     int i, first = -1;
 
     if (!ics) {
@@ -380,11 +378,9 @@ static void ics_free(ICSState *ics, int srcno, int num)
     }
 }
 
-void xics_spapr_free(XICSState *xics, int irq, int num)
+void spapr_ics_free(ICSState *ics, int irq, int num)
 {
-    ICSState *ics = xics_find_source(xics, irq);
-
-    if (ics) {
+    if (ics_valid_irq(ics, irq)) {
         trace_xics_ics_free(0, irq, num);
         ics_free(ics, irq - ics->offset, num);
     }
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index f1b690e8983e..130bfdc0055c 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -95,7 +95,8 @@
 
 #define HTAB_SIZE(spapr)        (1ULL << ((spapr)->htab_shift))
 
-static XICSState *try_create_xics(const char *type, const char *type_ics,
+static XICSState *try_create_xics(sPAPRMachineState *spapr,
+                                  const char *type, const char *type_ics,
                                   const char *type_icp, int nr_servers,
                                   int nr_irqs, Error **errp)
 {
@@ -112,7 +113,7 @@ static XICSState *try_create_xics(const char *type, const char *type_ics,
     }
 
     ics = ICS_SIMPLE(object_new(type_ics));
-    object_property_add_child(OBJECT(xics), "ics", OBJECT(ics), NULL);
+    object_property_add_child(OBJECT(spapr), "ics", OBJECT(ics), NULL);
     object_property_set_int(OBJECT(ics), nr_irqs, "nr-irqs", &err);
     object_property_add_const_link(OBJECT(ics), "xics", OBJECT(xics), NULL);
     object_property_set_bool(OBJECT(ics), true, "realized", &local_err);
@@ -138,6 +139,7 @@ static XICSState *try_create_xics(const char *type, const char *type_ics,
         object_unref(OBJECT(icp));
     }
 
+    spapr->ics = ics;
     return xics;
 
 error:
@@ -158,7 +160,8 @@ static XICSState *xics_system_init(MachineState *machine,
         Error *err = NULL;
 
         if (machine_kernel_irqchip_allowed(machine)) {
-            xics = try_create_xics(TYPE_XICS_SPAPR_KVM, TYPE_ICS_KVM,
+            xics = try_create_xics(SPAPR_MACHINE(machine),
+                                   TYPE_XICS_SPAPR_KVM, TYPE_ICS_KVM,
                                    TYPE_KVM_ICP, nr_servers, nr_irqs, &err);
         }
         if (machine_kernel_irqchip_required(machine) && !xics) {
@@ -170,8 +173,9 @@ static XICSState *xics_system_init(MachineState *machine,
     }
 
     if (!xics) {
-        xics = try_create_xics(TYPE_XICS_SPAPR, TYPE_ICS_SIMPLE, TYPE_ICP,
-                               nr_servers, nr_irqs, errp);
+        xics = try_create_xics(SPAPR_MACHINE(machine),
+                               TYPE_XICS_SPAPR, TYPE_ICS_SIMPLE,
+                               TYPE_ICP, nr_servers, nr_irqs, errp);
     }
 
     return xics;
diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
index f85a9c32a7fc..38b4258a9be7 100644
--- a/hw/ppc/spapr_events.c
+++ b/hw/ppc/spapr_events.c
@@ -752,7 +752,7 @@ void spapr_events_init(sPAPRMachineState *spapr)
     spapr->event_sources = spapr_event_sources_new();
 
     spapr_event_sources_register(spapr->event_sources, EVENT_CLASS_EPOW,
-                                 xics_spapr_alloc(spapr->xics, 0, false,
+                                 spapr_ics_alloc(spapr->ics, 0, false,
                                                   &error_fatal));
 
     /* NOTE: if machine supports modern/dedicated hotplug event source,
@@ -765,7 +765,7 @@ void spapr_events_init(sPAPRMachineState *spapr)
      */
     if (spapr->use_hotplug_event_source) {
         spapr_event_sources_register(spapr->event_sources, EVENT_CLASS_HOT_PLUG,
-                                     xics_spapr_alloc(spapr->xics, 0, false,
+                                     spapr_ics_alloc(spapr->ics, 0, false,
                                                       &error_fatal));
     }
 
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 1c4fa8b0f606..3f580a68be8e 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -326,7 +326,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, sPAPRMachineState *spapr,
             return;
         }
 
-        xics_spapr_free(spapr->xics, msi->first_irq, msi->num);
+        spapr_ics_free(spapr->ics, msi->first_irq, msi->num);
         if (msi_present(pdev)) {
             spapr_msi_setmsg(pdev, 0, false, 0, 0);
         }
@@ -364,7 +364,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, sPAPRMachineState *spapr,
     }
 
     /* Allocate MSIs */
-    irq = xics_spapr_alloc_block(spapr->xics, req_num, false,
+    irq = spapr_ics_alloc_block(spapr->ics, req_num, false,
                            ret_intr_type == RTAS_TYPE_MSI, &err);
     if (err) {
         error_reportf_err(err, "Can't allocate MSIs for device %x: ",
@@ -375,7 +375,7 @@ static void rtas_ibm_change_msi(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 
     /* Release previous MSIs */
     if (msi) {
-        xics_spapr_free(spapr->xics, msi->first_irq, msi->num);
+        spapr_ics_free(spapr->ics, msi->first_irq, msi->num);
         g_hash_table_remove(phb->msi, &config_addr);
     }
 
@@ -1747,7 +1747,7 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
         uint32_t irq;
         Error *local_err = NULL;
 
-        irq = xics_spapr_alloc_block(spapr->xics, 1, true, false, &local_err);
+        irq = spapr_ics_alloc_block(spapr->ics, 1, true, false, &local_err);
         if (local_err) {
             error_propagate(errp, local_err);
             error_prepend(errp, "can't allocate LSIs: ");
diff --git a/hw/ppc/spapr_vio.c b/hw/ppc/spapr_vio.c
index 8bfc5f971f8e..a0ee4fd26586 100644
--- a/hw/ppc/spapr_vio.c
+++ b/hw/ppc/spapr_vio.c
@@ -454,7 +454,7 @@ static void spapr_vio_busdev_realize(DeviceState *qdev, Error **errp)
         dev->qdev.id = id;
     }
 
-    dev->irq = xics_spapr_alloc(spapr->xics, dev->irq, false, &local_err);
+    dev->irq = spapr_ics_alloc(spapr->ics, dev->irq, false, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index f9b17d860a75..21e506b13cfa 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -59,6 +59,7 @@ struct sPAPRMachineState {
     QLIST_HEAD(, sPAPRPHBState) phbs;
     struct sPAPRNVRAM *nvram;
     XICSState *xics;
+    ICSState *ics;
     DeviceState *rtc;
 
     void *htab;
diff --git a/include/hw/ppc/xics.h b/include/hw/ppc/xics.h
index e79a70748e4c..37d4d9ce3f81 100644
--- a/include/hw/ppc/xics.h
+++ b/include/hw/ppc/xics.h
@@ -181,10 +181,10 @@ struct ICSIRQState {
 #define XICS_IRQS_SPAPR               1024
 
 qemu_irq xics_get_qirq(XICSState *icp, int irq);
-int xics_spapr_alloc(XICSState *icp, int irq_hint, bool lsi, Error **errp);
-int xics_spapr_alloc_block(XICSState *icp, int num, bool lsi, bool align,
+int spapr_ics_alloc(ICSState *ics, int irq_hint, bool lsi, Error **errp);
+int spapr_ics_alloc_block(ICSState *ics, int num, bool lsi, bool align,
                            Error **errp);
-void xics_spapr_free(XICSState *icp, int irq, int num);
+void spapr_ics_free(ICSState *ics, int irq, int num);
 void spapr_dt_xics(XICSState *xics, void *fdt, uint32_t phandle);
 
 void xics_cpu_setup(XICSState *icp, PowerPCCPU *cpu);
-- 
2.7.4