[08/10] spapr: Add DRC count indexed hotplug identifier type

From: Bharata B Rao <bharata@linux.vnet.ibm.com>

Add support for DRC count indexed hotplug ID type which is primarily
needed for memory hot unplug. This type allows for specifying the
number of DRs that should be plugged/unplugged starting from a given
DRC index.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
* updated rtas_event_log_v6_hp to reflect count/index field ordering
  used in PAPR hotplug ACR
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/ppc/spapr_events.c  | 76 ++++++++++++++++++++++++++++++++++++++++----------
 include/hw/ppc/spapr.h |  4 +++
 2 files changed, 65 insertions(+), 15 deletions(-)

On Mon, Oct 24, 2016 at 11:47:34PM -0500, Michael Roth wrote:
> From: Bharata B Rao <bharata@linux.vnet.ibm.com>
> 
> Add support for DRC count indexed hotplug ID type which is primarily
> needed for memory hot unplug. This type allows for specifying the
> number of DRs that should be plugged/unplugged starting from a given
> DRC index.
> 
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
> * updated rtas_event_log_v6_hp to reflect count/index field ordering
>   used in PAPR hotplug ACR
> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  hw/ppc/spapr_events.c  | 76 ++++++++++++++++++++++++++++++++++++++++----------
>  include/hw/ppc/spapr.h |  4 +++
>  2 files changed, 65 insertions(+), 15 deletions(-)
> 
> diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
> index b6b3511..596e991 100644
> --- a/hw/ppc/spapr_events.c
> +++ b/hw/ppc/spapr_events.c
> @@ -175,6 +175,16 @@ struct epow_log_full {
>      struct rtas_event_log_v6_epow epow;
>  } QEMU_PACKED;
>  
> +union drc_identifier {
> +    uint32_t index;
> +    uint32_t count;
> +    struct {
> +        uint32_t count;
> +        uint32_t index;
> +    } count_indexed;
> +    char name[1];
> +} QEMU_PACKED;
> +
>  struct rtas_event_log_v6_hp {
>  #define RTAS_LOG_V6_SECTION_ID_HOTPLUG              0x4850 /* HP */
>      struct rtas_event_log_v6_section_header hdr;
> @@ -191,12 +201,9 @@ struct rtas_event_log_v6_hp {
>  #define RTAS_LOG_V6_HP_ID_DRC_NAME                       1
>  #define RTAS_LOG_V6_HP_ID_DRC_INDEX                      2
>  #define RTAS_LOG_V6_HP_ID_DRC_COUNT                      3
> +#define RTAS_LOG_V6_HP_ID_DRC_COUNT_INDEXED              4
>      uint8_t reserved;
> -    union {
> -        uint32_t index;
> -        uint32_t count;
> -        char name[1];
> -    } drc;
> +    union drc_identifier drc_id;
>  } QEMU_PACKED;
>  
>  struct hp_log_full {
> @@ -496,7 +503,7 @@ static void spapr_hotplug_set_signalled(uint32_t drc_index)
>  
>  static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
>                                      sPAPRDRConnectorType drc_type,
> -                                    uint32_t drc)
> +                                    union drc_identifier *drc_id)
>  {
>      sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
>      struct hp_log_full *new_hp;
> @@ -541,7 +548,7 @@ static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
>      case SPAPR_DR_CONNECTOR_TYPE_PCI:
>          hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_PCI;
>          if (hp->hotplug_action == RTAS_LOG_V6_HP_ACTION_ADD) {
> -            spapr_hotplug_set_signalled(drc);
> +            spapr_hotplug_set_signalled(drc_id->index);
>          }
>          break;
>      case SPAPR_DR_CONNECTOR_TYPE_LMB:
> @@ -559,9 +566,18 @@ static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
>      }
>  
>      if (hp_id == RTAS_LOG_V6_HP_ID_DRC_COUNT) {
> -        hp->drc.count = cpu_to_be32(drc);
> +        hp->drc_id.count = cpu_to_be32(drc_id->count);
>      } else if (hp_id == RTAS_LOG_V6_HP_ID_DRC_INDEX) {
> -        hp->drc.index = cpu_to_be32(drc);
> +        hp->drc_id.index = cpu_to_be32(drc_id->index);
> +    } else if (hp_id == RTAS_LOG_V6_HP_ID_DRC_COUNT_INDEXED) {
> +        /* we should not be using count_indexed value unless the guest
> +         * supports dedicated hotplug event source
> +         */
> +        g_assert(spapr_ovec_test(spapr->ov5_cas, OV5_HP_EVT));
> +        hp->drc_id.count_indexed.count =
> +            cpu_to_be32(drc_id->count_indexed.count);
> +        hp->drc_id.count_indexed.index =
> +            cpu_to_be32(drc_id->count_indexed.index);
>      }
>  
>      rtas_event_log_queue(RTAS_LOG_TYPE_HOTPLUG, new_hp, true);
> @@ -575,34 +591,64 @@ void spapr_hotplug_req_add_by_index(sPAPRDRConnector *drc)
>  {
>      sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
>      sPAPRDRConnectorType drc_type = drck->get_type(drc);
> -    uint32_t index = drck->get_index(drc);
> +    union drc_identifier drc_id;
>  
> +    drc_id.index = drck->get_index(drc);
>      spapr_hotplug_req_event(RTAS_LOG_V6_HP_ID_DRC_INDEX,
> -                            RTAS_LOG_V6_HP_ACTION_ADD, drc_type, index);
> +                            RTAS_LOG_V6_HP_ACTION_ADD, drc_type, &drc_id);
>  }
>  
>  void spapr_hotplug_req_remove_by_index(sPAPRDRConnector *drc)
>  {
>      sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
>      sPAPRDRConnectorType drc_type = drck->get_type(drc);
> -    uint32_t index = drck->get_index(drc);
> +    union drc_identifier drc_id;
>  
> +    drc_id.index = drck->get_index(drc);
>      spapr_hotplug_req_event(RTAS_LOG_V6_HP_ID_DRC_INDEX,
> -                            RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, index);
> +                            RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_id);
>  }
>  
>  void spapr_hotplug_req_add_by_count(sPAPRDRConnectorType drc_type,
>                                         uint32_t count)
>  {
> +    union drc_identifier drc_id;
> +
> +    drc_id.count = count;
>      spapr_hotplug_req_event(RTAS_LOG_V6_HP_ID_DRC_COUNT,
> -                            RTAS_LOG_V6_HP_ACTION_ADD, drc_type, count);
> +                            RTAS_LOG_V6_HP_ACTION_ADD, drc_type, &drc_id);
>  }
>  
>  void spapr_hotplug_req_remove_by_count(sPAPRDRConnectorType drc_type,
>                                            uint32_t count)
>  {
> +    union drc_identifier drc_id;
> +
> +    drc_id.count = count;
>      spapr_hotplug_req_event(RTAS_LOG_V6_HP_ID_DRC_COUNT,
> -                            RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, count);
> +                            RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_id);
> +}
> +
> +void spapr_hotplug_req_add_by_count_indexed(sPAPRDRConnectorType drc_type,
> +                                            uint32_t count, uint32_t index)
> +{
> +    union drc_identifier drc_id;
> +
> +    drc_id.count_indexed.count = count;
> +    drc_id.count_indexed.index = index;
> +    spapr_hotplug_req_event(RTAS_LOG_V6_HP_ID_DRC_COUNT_INDEXED,
> +                            RTAS_LOG_V6_HP_ACTION_ADD, drc_type, &drc_id);
> +}
> +
> +void spapr_hotplug_req_remove_by_count_indexed(sPAPRDRConnectorType drc_type,
> +                                               uint32_t count, uint32_t index)
> +{
> +    union drc_identifier drc_id;
> +
> +    drc_id.count_indexed.count = count;
> +    drc_id.count_indexed.index = index;
> +    spapr_hotplug_req_event(RTAS_LOG_V6_HP_ID_DRC_COUNT_INDEXED,
> +                            RTAS_LOG_V6_HP_ACTION_REMOVE, drc_type, &drc_id);
>  }
>  
>  static void check_exception(PowerPCCPU *cpu, sPAPRMachineState *spapr,
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 21af971..bd5bcf7 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -610,6 +610,10 @@ void spapr_hotplug_req_add_by_count(sPAPRDRConnectorType drc_type,
>                                         uint32_t count);
>  void spapr_hotplug_req_remove_by_count(sPAPRDRConnectorType drc_type,
>                                            uint32_t count);
> +void spapr_hotplug_req_add_by_count_indexed(sPAPRDRConnectorType drc_type,
> +                                            uint32_t count, uint32_t index);
> +void spapr_hotplug_req_remove_by_count_indexed(sPAPRDRConnectorType drc_type,
> +                                               uint32_t count, uint32_t index);
>  void spapr_cpu_init(sPAPRMachineState *spapr, PowerPCCPU *cpu, Error **errp);
>  void *spapr_populate_hotplug_cpu_dt(CPUState *cs, int *fdt_offset,
>                                      sPAPRMachineState *spapr);