[Qemu-devel] [RFC PATCH v1 05/13] spapr: Support ibm, lrdr-capacity device tree property

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

Add support for ibm,lrdr-capacity since this is needed by the guest
kernel to know about the possible hot-pluggable CPUs and Memory.

Define minimum hotpluggable memory size as 256MB and start storing maximum
possible memory for the guest in sPAPREnvironment.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
 hw/ppc/spapr.c         |  3 ++-
 hw/ppc/spapr_rtas.c    | 28 ++++++++++++++++++++++++++--
 include/hw/ppc/spapr.h |  6 ++++--
 3 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index f49b0fa..515d770 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -775,7 +775,7 @@ static void spapr_finalize_fdt(sPAPREnvironment *spapr,
     }
 
     /* RTAS */
-    ret = spapr_rtas_device_tree_setup(fdt, rtas_addr, rtas_size);
+    ret = spapr_rtas_device_tree_setup(spapr, fdt, rtas_addr, rtas_size);
     if (ret < 0) {
         fprintf(stderr, "Couldn't set up RTAS device tree properties\n");
     }
@@ -1473,6 +1473,7 @@ static void ppc_spapr_init(MachineState *machine)
 
     /* allocate RAM */
     spapr->ram_limit = ram_size;
+    spapr->maxram_limit = machine->maxram_size;
     memory_region_allocate_system_memory(ram, NULL, "ppc_spapr.ram",
                                          spapr->ram_limit);
     memory_region_add_subregion(sysmem, 0, ram);
diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
index d847f45..e8a0f21 100644
--- a/hw/ppc/spapr_rtas.c
+++ b/hw/ppc/spapr_rtas.c
@@ -29,6 +29,7 @@
 #include "sysemu/char.h"
 #include "hw/qdev.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/cpus.h"
 
 #include "hw/ppc/spapr.h"
 #include "hw/ppc/spapr_vio.h"
@@ -551,11 +552,12 @@ void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
     rtas_table[token].fn = fn;
 }
 
-int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
-                                 hwaddr rtas_size)
+int spapr_rtas_device_tree_setup(sPAPREnvironment *spapr, void *fdt,
+                                 hwaddr rtas_addr, hwaddr rtas_size)
 {
     int ret;
     int i;
+    uint32_t lrdr_capacity[5];
 
     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
     if (ret < 0) {
@@ -604,6 +606,28 @@ int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
         }
 
     }
+
+    ret = qemu_fdt_setprop_cell(fdt, "/rtas", "#address-cells", 0x2);
+    if (ret < 0) {
+        fprintf(stderr, "Couldn't add #address-cells rtas property\n");
+    }
+
+    ret = qemu_fdt_setprop_cell(fdt, "/rtas", "#size-cells", 0x2);
+    if (ret < 0) {
+        fprintf(stderr, "Couldn't add #size-cells rtas property\n");
+    }
+
+    lrdr_capacity[0] = cpu_to_be32(spapr->maxram_limit >> 32);
+    lrdr_capacity[1] = cpu_to_be32(spapr->maxram_limit & 0xffffffff);
+    lrdr_capacity[2] = 0;
+    lrdr_capacity[3] = cpu_to_be32(SPAPR_MIN_MEMORY_BLOCK_SIZE);
+    lrdr_capacity[4] = cpu_to_be32(max_cpus/smp_threads);
+    ret = qemu_fdt_setprop(fdt, "/rtas", "ibm,lrdr-capacity", lrdr_capacity,
+                     sizeof(lrdr_capacity));
+    if (ret < 0) {
+        fprintf(stderr, "Couldn't add ibm,lrdr-capacity rtas property\n");
+    }
+
     return 0;
 }
 
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 831db6b..ae8b4e1 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -18,6 +18,7 @@ typedef struct sPAPREnvironment {
     XICSState *icp;
 
     hwaddr ram_limit;
+    hwaddr maxram_limit;
     void *htab;
     uint32_t htab_shift;
     hwaddr rma_size;
@@ -444,8 +445,8 @@ void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn);
 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                              uint32_t token, uint32_t nargs, target_ulong args,
                              uint32_t nret, target_ulong rets);
-int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
-                                 hwaddr rtas_size);
+int spapr_rtas_device_tree_setup(sPAPREnvironment *spapr, void *fdt,
+                                 hwaddr rtas_addr, hwaddr rtas_size);
 
 #define SPAPR_TCE_PAGE_SHIFT   12
 #define SPAPR_TCE_PAGE_SIZE    (1ULL << SPAPR_TCE_PAGE_SHIFT)
@@ -479,6 +480,7 @@ struct sPAPRTCETable {
 };
 
 #define TIMEBASE_FREQ           512000000ULL
+#define SPAPR_MIN_MEMORY_BLOCK_SIZE (1 << 28) /* 256MB */
 
 void spapr_events_init(sPAPREnvironment *spapr);
 void spapr_events_fdt_skel(void *fdt, uint32_t epow_irq);
-- 
2.1.0