[PATCH v6 18/20] ppc/pnv: Introduce a pnv_xive_block_id() helper

[Cédric Le Goater]

When PC_TCTXT_CHIPID_OVERRIDE is configured, the PC_TCTXT_CHIPID field
overrides the hardwired chip ID in the Powerbus operations and for CAM
compares. This is typically used in the one block-per-chip configuration
to associate a unique block id number to each IC of the system.

Simplify the model with a pnv_xive_block_id() helper and remove
'tctx_chipid' which becomes useless.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 include/hw/ppc/pnv_xive.h |  3 --
 hw/intc/pnv_xive.c        | 64 ++++++++++++++++++++-------------------
 2 files changed, 33 insertions(+), 34 deletions(-)

diff --git a/include/hw/ppc/pnv_xive.h b/include/hw/ppc/pnv_xive.h
index 4fdaa9247d65..f4c7caad40ee 100644
--- a/include/hw/ppc/pnv_xive.h
+++ b/include/hw/ppc/pnv_xive.h
@@ -72,9 +72,6 @@ typedef struct PnvXive {
     /* Interrupt controller registers */
     uint64_t      regs[0x300];
 
-    /* Can be configured by FW */
-    uint32_t      tctx_chipid;
-
     /*
      * Virtual Structure Descriptor tables : EAT, SBE, ENDT, NVTT, IRQ
      * These are in a SRAM protected by ECC.
diff --git a/hw/intc/pnv_xive.c b/hw/intc/pnv_xive.c
index 216ebc150a41..23e73641f254 100644
--- a/hw/intc/pnv_xive.c
+++ b/hw/intc/pnv_xive.c
@@ -85,13 +85,30 @@ static inline uint64_t SETFIELD(uint64_t mask, uint64_t 
word,
     return (word & ~mask) | ((value << ctz64(mask)) & mask);
 }
 
+/*
+ * When PC_TCTXT_CHIPID_OVERRIDE is configured, the PC_TCTXT_CHIPID
+ * field overrides the hardwired chip ID in the Powerbus operations
+ * and for CAM compares
+ */
+static uint8_t pnv_xive_block_id(PnvXive *xive)
+{
+    uint8_t blk = xive->chip->chip_id;
+    uint64_t cfg_val = xive->regs[PC_TCTXT_CFG >> 3];
+
+    if (cfg_val & PC_TCTXT_CHIPID_OVERRIDE) {
+        blk = GETFIELD(PC_TCTXT_CHIPID, cfg_val);
+    }
+
+    return blk;
+}
+
 /*
  * Remote access to controllers. HW uses MMIOs. For now, a simple scan
  * of the chips is good enough.
  *
  * TODO: Block scope support
  */
-static PnvXive *pnv_xive_get_ic(uint8_t blk)
+static PnvXive *pnv_xive_get_remote(uint8_t blk)
 {
     PnvMachineState *pnv = PNV_MACHINE(qdev_get_machine());
     int i;
@@ -100,7 +117,7 @@ static PnvXive *pnv_xive_get_ic(uint8_t blk)
         Pnv9Chip *chip9 = PNV9_CHIP(pnv->chips[i]);
         PnvXive *xive = &chip9->xive;
 
-        if (xive->chip->chip_id == blk) {
+        if (pnv_xive_block_id(xive) == blk) {
             return xive;
         }
     }
@@ -216,7 +233,7 @@ static uint64_t pnv_xive_vst_addr(PnvXive *xive, uint32_t 
type, uint8_t blk,
 
     /* Remote VST access */
     if (GETFIELD(VSD_MODE, vsd) == VSD_MODE_FORWARD) {
-        xive = pnv_xive_get_ic(blk);
+        xive = pnv_xive_get_remote(blk);
 
         return xive ? pnv_xive_vst_addr(xive, type, blk, idx) : 0;
     }
@@ -364,7 +381,10 @@ static int pnv_xive_get_eas(XiveRouter *xrtr, uint8_t blk, 
uint32_t idx,
 {
     PnvXive *xive = PNV_XIVE(xrtr);
 
-    if (pnv_xive_get_ic(blk) != xive) {
+    /*
+     * EAT lookups should be local to the IC
+     */
+    if (pnv_xive_block_id(xive) != blk) {
         xive_error(xive, "VST: EAS %x is remote !?", XIVE_EAS(blk, idx));
         return -1;
     }
@@ -470,7 +490,7 @@ static PnvXive *pnv_xive_tm_get_xive(PowerPCCPU *cpu)
 static void pnv_xive_notify(XiveNotifier *xn, uint32_t srcno)
 {
     PnvXive *xive = PNV_XIVE(xn);
-    uint8_t blk = xive->chip->chip_id;
+    uint8_t blk = pnv_xive_block_id(xive);
 
     xive_router_notify(xn, XIVE_EAS(blk, srcno));
 }
@@ -834,20 +854,7 @@ static void pnv_xive_ic_reg_write(void *opaque, hwaddr 
offset,
     case PC_TCTXT_CFG:
         /*
          * TODO: block group support
-         *
-         * PC_TCTXT_CFG_BLKGRP_EN
-         * PC_TCTXT_CFG_HARD_CHIPID_BLK :
-         *   Moves the chipid into block field for hardwired CAM compares.
-         *   Block offset value is adjusted to 0b0..01 & ThrdId
-         *
-         *   Will require changes in xive_presenter_tctx_match(). I am
-         *   not sure how to handle that yet.
          */
-
-        /* Overrides hardwired chip ID with the chip ID field */
-        if (val & PC_TCTXT_CHIPID_OVERRIDE) {
-            xive->tctx_chipid = GETFIELD(PC_TCTXT_CHIPID, val);
-        }
         break;
     case PC_TCTXT_TRACK:
         /*
@@ -1656,19 +1663,20 @@ static const MemoryRegionOps pnv_xive_pc_ops = {
 void pnv_xive_pic_print_info(PnvXive *xive, Monitor *mon)
 {
     XiveRouter *xrtr = XIVE_ROUTER(xive);
-    uint8_t blk = xive->chip->chip_id;
+    uint8_t blk = pnv_xive_block_id(xive);
+    uint8_t chip_id = xive->chip->chip_id;
     uint32_t srcno0 = XIVE_EAS(blk, 0);
     uint32_t nr_ipis = pnv_xive_nr_ipis(xive, blk);
     XiveEAS eas;
     XiveEND end;
     int i;
 
-    monitor_printf(mon, "XIVE[%x] Source %08x .. %08x\n", blk, srcno0,
-                   srcno0 + nr_ipis - 1);
+    monitor_printf(mon, "XIVE[%x] #%d Source %08x .. %08x\n", chip_id, blk,
+                   srcno0, srcno0 + nr_ipis - 1);
     xive_source_pic_print_info(&xive->ipi_source, srcno0, mon);
 
-    monitor_printf(mon, "XIVE[%x] EAT %08x .. %08x\n", blk, srcno0,
-                   srcno0 + nr_ipis - 1);
+    monitor_printf(mon, "XIVE[%x] #%d EAT %08x .. %08x\n", chip_id, blk,
+                   srcno0, srcno0 + nr_ipis - 1);
     for (i = 0; i < nr_ipis; i++) {
         if (xive_router_get_eas(xrtr, blk, i, &eas)) {
             break;
@@ -1678,13 +1686,13 @@ void pnv_xive_pic_print_info(PnvXive *xive, Monitor 
*mon)
         }
     }
 
-    monitor_printf(mon, "XIVE[%x] ENDT\n", blk);
+    monitor_printf(mon, "XIVE[%x] #%d ENDT\n", chip_id, blk);
     i = 0;
     while (!xive_router_get_end(xrtr, blk, i, &end)) {
         xive_end_pic_print_info(&end, i++, mon);
     }
 
-    monitor_printf(mon, "XIVE[%x] END Escalation EAT\n", blk);
+    monitor_printf(mon, "XIVE[%x] #%d END Escalation EAT\n", chip_id, blk);
     i = 0;
     while (!xive_router_get_end(xrtr, blk, i, &end)) {
         xive_end_eas_pic_print_info(&end, i++, mon);
@@ -1697,12 +1705,6 @@ static void pnv_xive_reset(void *dev)
     XiveSource *xsrc = &xive->ipi_source;
     XiveENDSource *end_xsrc = &xive->end_source;
 
-    /*
-     * Use the PnvChip id to identify the XIVE interrupt controller.
-     * It can be overriden by configuration at runtime.
-     */
-    xive->tctx_chipid = xive->chip->chip_id;
-
     /* Default page size (Should be changed at runtime to 64k) */
     xive->ic_shift = xive->vc_shift = xive->pc_shift = 12;
 
-- 
2.21.0