[Qemu-devel] [PATCH 1/2] ppc/pnc: fix XSCOM MMIO base address for P9 machines with multiple chips

[Cédric Le Goater]

The PNV_XSCOM_BASE and PNV_XSCOM_SIZE macros are specific to POWER8
and they are used when the device tree is populated and the MMIO
region created, even for POWER9 chips. This is not too much of a
problem today because we don't have important devices on the second
chip, but we might have oneday (PHBs).

Fix by using the appropriate macros in case of P9.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 include/hw/ppc/pnv.h       |  3 +++
 include/hw/ppc/pnv_xscom.h |  2 +-
 hw/ppc/pnv.c               | 24 ++++++++++++++++--------
 hw/ppc/pnv_xscom.c         | 17 ++++++++++++-----
 4 files changed, 32 insertions(+), 14 deletions(-)

diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h
index 703e5ef222de..aa926d120771 100644
--- a/include/hw/ppc/pnv.h
+++ b/include/hw/ppc/pnv.h
@@ -283,4 +283,7 @@ int pnv_bmc_hiomap(IPMIBmc *bmc);
 #define PNV9_PSIHB_ESB_SIZE          0x0000000000010000ull
 #define PNV9_PSIHB_ESB_BASE(chip)    PNV9_CHIP_BASE(chip, 
0x00060302031c0000ull)
 
+#define PNV9_XSCOM_SIZE              0x0000000400000000ull
+#define PNV9_XSCOM_BASE(chip)        PNV9_CHIP_BASE(chip, 0x00603fc00000000ull)
+
 #endif /* PPC_PNV_H */
diff --git a/include/hw/ppc/pnv_xscom.h b/include/hw/ppc/pnv_xscom.h
index 7ddc82c3a288..78fcf88a495b 100644
--- a/include/hw/ppc/pnv_xscom.h
+++ b/include/hw/ppc/pnv_xscom.h
@@ -102,7 +102,7 @@ typedef struct PnvXScomInterfaceClass {
 #define PNV9_XSCOM_PEC_PCI_BASE   0xd010800
 #define PNV9_XSCOM_PEC_PCI_SIZE   0x200
 
-extern void pnv_xscom_realize(PnvChip *chip, Error **errp);
+extern void pnv_xscom_realize(PnvChip *chip, uint64_t size, Error **errp);
 extern int pnv_dt_xscom(PnvChip *chip, void *fdt, int offset);
 
 extern void pnv_xscom_add_subregion(PnvChip *chip, hwaddr offset,
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 7b60c97339dd..92c01dfc09ef 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -902,6 +902,14 @@ static void pnv_chip_power8_realize(DeviceState *dev, 
Error **errp)
     Error *local_err = NULL;
     int i;
 
+    /* XSCOM bridge is first */
+    pnv_xscom_realize(chip, PNV_XSCOM_SIZE, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+    sysbus_mmio_map(SYS_BUS_DEVICE(chip), 0, PNV_XSCOM_BASE(chip));
+
     pcc->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -1092,6 +1100,14 @@ static void pnv_chip_power9_realize(DeviceState *dev, 
Error **errp)
     Error *local_err = NULL;
     uint32_t i;
 
+    /* XSCOM bridge is first */
+    pnv_xscom_realize(chip, PNV9_XSCOM_SIZE, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
+    sysbus_mmio_map(SYS_BUS_DEVICE(chip), 0, PNV9_XSCOM_BASE(chip));
+
     pcc->parent_realize(dev, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
@@ -1301,14 +1317,6 @@ static void pnv_chip_realize(DeviceState *dev, Error 
**errp)
     PnvChip *chip = PNV_CHIP(dev);
     Error *error = NULL;
 
-    /* XSCOM bridge */
-    pnv_xscom_realize(chip, &error);
-    if (error) {
-        error_propagate(errp, error);
-        return;
-    }
-    sysbus_mmio_map(SYS_BUS_DEVICE(chip), 0, PNV_XSCOM_BASE(chip));
-
     /* Cores */
     pnv_chip_core_realize(chip, &error);
     if (error) {
diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
index cc7c66320f23..770176326526 100644
--- a/hw/ppc/pnv_xscom.c
+++ b/hw/ppc/pnv_xscom.c
@@ -211,17 +211,17 @@ const MemoryRegionOps pnv_xscom_ops = {
     .endianness = DEVICE_BIG_ENDIAN,
 };
 
-void pnv_xscom_realize(PnvChip *chip, Error **errp)
+void pnv_xscom_realize(PnvChip *chip, uint64_t size, Error **errp)
 {
     SysBusDevice *sbd = SYS_BUS_DEVICE(chip);
     char *name;
 
     name = g_strdup_printf("xscom-%x", chip->chip_id);
     memory_region_init_io(&chip->xscom_mmio, OBJECT(chip), &pnv_xscom_ops,
-                          chip, name, PNV_XSCOM_SIZE);
+                          chip, name, size);
     sysbus_init_mmio(sbd, &chip->xscom_mmio);
 
-    memory_region_init(&chip->xscom, OBJECT(chip), name, PNV_XSCOM_SIZE);
+    memory_region_init(&chip->xscom, OBJECT(chip), name, size);
     address_space_init(&chip->xscom_as, &chip->xscom, name);
     g_free(name);
 }
@@ -263,12 +263,19 @@ static const char compat_p9[] = 
"ibm,power9-xscom\0ibm,xscom";
 
 int pnv_dt_xscom(PnvChip *chip, void *fdt, int root_offset)
 {
-    uint64_t reg[] = { cpu_to_be64(PNV_XSCOM_BASE(chip)),
-                       cpu_to_be64(PNV_XSCOM_SIZE) };
+    uint64_t reg[2];
     int xscom_offset;
     ForeachPopulateArgs args;
     char *name;
 
+    if (pnv_chip_is_power9(chip)) {
+        reg[0] = cpu_to_be64(PNV9_XSCOM_BASE(chip));
+        reg[1] = cpu_to_be64(PNV9_XSCOM_SIZE);
+    } else {
+        reg[0] = cpu_to_be64(PNV_XSCOM_BASE(chip));
+        reg[1] = cpu_to_be64(PNV_XSCOM_SIZE);
+    }
+
     name = g_strdup_printf("xscom@%" PRIx64, be64_to_cpu(reg[0]));
     xscom_offset = fdt_add_subnode(fdt, root_offset, name);
     _FDT(xscom_offset);
-- 
2.21.0