Re: [Qemu-devel] [PATCH v3 1/5] pc-dimm: refactor qmp_pc_dimm_device_list

[Igor Mammedov <imammedo@redhat.com>]

On Mon,  5 Mar 2018 14:57:06 +0800
Haozhong Zhang <haozhong.zhang@intel.com> wrote:

I'd suggest following commit subj/msg:

-----
 pc-dimm: make qmp_pc_dimm_device_list() sort devices by address

 Make qmp_pc_dimm_device_list() return sorted by start address
 list of devices so that it could be reused in places that
 would need sorted list*. Reuse existing pc_dimm_built_list()
 to get sorted list.

 While at it hide recursive callbacks from callers, so that:

   qmp_pc_dimm_device_list(qdev_get_machine(), &list);

 could be replaced with simpler:

   list = qmp_pc_dimm_device_list();

 * follow up patch will use it in build_srat()
-----

with commit message updated:
  Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> Use pc_dimm_built_list to hide recursive callbacks from callers.
> 
> Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
> ---
>  hw/mem/pc-dimm.c         | 83 +++++++++++++++++++++++++-----------------------
>  hw/ppc/spapr.c           |  3 +-
>  include/hw/mem/pc-dimm.h |  2 +-
>  numa.c                   |  4 +--
>  qmp.c                    |  7 +---
>  stubs/qmp_pc_dimm.c      |  4 +--
>  6 files changed, 50 insertions(+), 53 deletions(-)
> 
> diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
> index 6e74b61cb6..4d050fe2cd 100644
> --- a/hw/mem/pc-dimm.c
> +++ b/hw/mem/pc-dimm.c
> @@ -162,45 +162,6 @@ uint64_t get_plugged_memory_size(void)
>      return pc_existing_dimms_capacity(&error_abort);
>  }
>  
> -int qmp_pc_dimm_device_list(Object *obj, void *opaque)
> -{
> -    MemoryDeviceInfoList ***prev = opaque;
> -
> -    if (object_dynamic_cast(obj, TYPE_PC_DIMM)) {
> -        DeviceState *dev = DEVICE(obj);
> -
> -        if (dev->realized) {
> -            MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
> -            MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
> -            PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
> -            DeviceClass *dc = DEVICE_GET_CLASS(obj);
> -            PCDIMMDevice *dimm = PC_DIMM(obj);
> -
> -            if (dev->id) {
> -                di->has_id = true;
> -                di->id = g_strdup(dev->id);
> -            }
> -            di->hotplugged = dev->hotplugged;
> -            di->hotpluggable = dc->hotpluggable;
> -            di->addr = dimm->addr;
> -            di->slot = dimm->slot;
> -            di->node = dimm->node;
> -            di->size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP,
> -                                                NULL);
> -            di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
> -
> -            info->u.dimm.data = di;
> -            elem->value = info;
> -            elem->next = NULL;
> -            **prev = elem;
> -            *prev = &elem->next;
> -        }
> -    }
> -
> -    object_child_foreach(obj, qmp_pc_dimm_device_list, opaque);
> -    return 0;
> -}
> -
>  static int pc_dimm_slot2bitmap(Object *obj, void *opaque)
>  {
>      unsigned long *bitmap = opaque;
> @@ -276,6 +237,50 @@ static int pc_dimm_built_list(Object *obj, void *opaque)
>      return 0;
>  }
>  
> +MemoryDeviceInfoList *qmp_pc_dimm_device_list(void)
> +{
> +    GSList *dimms = NULL, *item;
> +    MemoryDeviceInfoList *list = NULL, *prev = NULL;
> +
> +    object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &dimms);
> +
> +    for (item = dimms; item; item = g_slist_next(item)) {
> +        PCDIMMDevice *dimm = PC_DIMM(item->data);
> +        Object *obj = OBJECT(dimm);
> +        MemoryDeviceInfoList *elem = g_new0(MemoryDeviceInfoList, 1);
> +        MemoryDeviceInfo *info = g_new0(MemoryDeviceInfo, 1);
> +        PCDIMMDeviceInfo *di = g_new0(PCDIMMDeviceInfo, 1);
> +        DeviceClass *dc = DEVICE_GET_CLASS(obj);
> +        DeviceState *dev = DEVICE(obj);
> +
> +        if (dev->id) {
> +            di->has_id = true;
> +            di->id = g_strdup(dev->id);
> +        }
> +        di->hotplugged = dev->hotplugged;
> +        di->hotpluggable = dc->hotpluggable;
> +        di->addr = dimm->addr;
> +        di->slot = dimm->slot;
> +        di->node = dimm->node;
> +        di->size = object_property_get_uint(obj, PC_DIMM_SIZE_PROP, NULL);
> +        di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));
> +
> +        info->u.dimm.data = di;
> +        elem->value = info;
> +        elem->next = NULL;
> +        if (prev) {
> +            prev->next = elem;
> +        } else {
> +            list = elem;
> +        }
> +        prev = elem;
> +    }
> +
> +    g_slist_free(dimms);
> +
> +    return list;
> +}
> +
>  uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
>                                 uint64_t address_space_size,
>                                 uint64_t *hint, uint64_t align, uint64_t size,
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 83c9d66dd5..68a81e47d2 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -731,8 +731,7 @@ static int spapr_populate_drconf_memory(sPAPRMachineState *spapr, void *fdt)
>      }
>  
>      if (hotplug_lmb_start) {
> -        MemoryDeviceInfoList **prev = &dimms;
> -        qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
> +        dimms = qmp_pc_dimm_device_list();
>      }
>  
>      /* ibm,dynamic-memory */
> diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> index d83b957829..1fc479281c 100644
> --- a/include/hw/mem/pc-dimm.h
> +++ b/include/hw/mem/pc-dimm.h
> @@ -93,7 +93,7 @@ uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
>  
>  int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
>  
> -int qmp_pc_dimm_device_list(Object *obj, void *opaque);
> +MemoryDeviceInfoList *qmp_pc_dimm_device_list(void);
>  uint64_t pc_existing_dimms_capacity(Error **errp);
>  uint64_t get_plugged_memory_size(void);
>  void pc_dimm_memory_plug(DeviceState *dev, MemoryHotplugState *hpms,
> diff --git a/numa.c b/numa.c
> index 7e0e789b02..c6734ceb8c 100644
> --- a/numa.c
> +++ b/numa.c
> @@ -520,12 +520,10 @@ void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
>  
>  static void numa_stat_memory_devices(NumaNodeMem node_mem[])
>  {
> -    MemoryDeviceInfoList *info_list = NULL;
> -    MemoryDeviceInfoList **prev = &info_list;
> +    MemoryDeviceInfoList *info_list = qmp_pc_dimm_device_list();
>      MemoryDeviceInfoList *info;
>      PCDIMMDeviceInfo     *pcdimm_info;
>  
> -    qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
>      for (info = info_list; info; info = info->next) {
>          MemoryDeviceInfo *value = info->value;
>  
> diff --git a/qmp.c b/qmp.c
> index 793f6f3323..c6ac7b05b4 100644
> --- a/qmp.c
> +++ b/qmp.c
> @@ -680,12 +680,7 @@ void qmp_object_del(const char *id, Error **errp)
>  
>  MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
>  {
> -    MemoryDeviceInfoList *head = NULL;
> -    MemoryDeviceInfoList **prev = &head;
> -
> -    qmp_pc_dimm_device_list(qdev_get_machine(), &prev);
> -
> -    return head;
> +    return qmp_pc_dimm_device_list();
>  }
>  
>  ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
> diff --git a/stubs/qmp_pc_dimm.c b/stubs/qmp_pc_dimm.c
> index 9ddc4f619a..b6b2cca89e 100644
> --- a/stubs/qmp_pc_dimm.c
> +++ b/stubs/qmp_pc_dimm.c
> @@ -2,9 +2,9 @@
>  #include "qom/object.h"
>  #include "hw/mem/pc-dimm.h"
>  
> -int qmp_pc_dimm_device_list(Object *obj, void *opaque)
> +MemoryDeviceInfoList *qmp_pc_dimm_device_list(void)
>  {
> -   return 0;
> +   return NULL;
>  }
>  
>  uint64_t get_plugged_memory_size(void)