[PATCH v04 3/5] migration/memory: Add hotplug READD_MULTIPLE

[Michael Bringmann]

migration/memory: This patch adds a new pseries hotplug action
for CPU and memory operations, PSERIES_HP_ELOG_ACTION_READD_MULTIPLE.
This is a variant of the READD operation which performs the action
upon multiple instances of the resource at one time.  The operation
is to be triggered by device-tree analysis of updates by RTAS events
analyzed by 'migation_store' during post-migration processing.  It
will be used for memory updates, initially.

Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com>
---
Changes in v04:
  -- Move init of 'lmb->internal_flags' in init_drmem_v2_lmbs to
     previous patch.
  -- Pull in implementation of dlpar_memory_readd_multiple() to go
     with operation flag.
---
 arch/powerpc/include/asm/rtas.h                 |    1 +
 arch/powerpc/platforms/pseries/hotplug-memory.c |   31 +++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
index 0183e95..cc00451 100644
--- a/arch/powerpc/include/asm/rtas.h
+++ b/arch/powerpc/include/asm/rtas.h
@@ -333,6 +333,7 @@ struct pseries_hp_errorlog {
 #define PSERIES_HP_ELOG_ACTION_ADD     1
 #define PSERIES_HP_ELOG_ACTION_REMOVE  2
 #define PSERIES_HP_ELOG_ACTION_READD   3
+#define PSERIES_HP_ELOG_ACTION_READD_MULTIPLE  4
 
 #define PSERIES_HP_ELOG_ID_DRC_NAME    1
 #define PSERIES_HP_ELOG_ID_DRC_INDEX   2
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c 
b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 9a15d39..bf2420a 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -546,6 +546,30 @@ static int dlpar_memory_readd_by_index(u32 drc_index)
        return rc;
 }
 
+static int dlpar_memory_readd_multiple(void)
+{
+       struct drmem_lmb *lmb;
+       int rc;
+
+       pr_info("Attempting to update multiple LMBs\n");
+
+       for_each_drmem_lmb(lmb) {
+               if (drmem_lmb_update(lmb)) {
+                       rc = dlpar_remove_lmb(lmb);
+
+                       if (!rc) {
+                               rc = dlpar_add_lmb(lmb);
+                               if (rc)
+                                       dlpar_release_drc(lmb->drc_index);
+                       }
+
+                       drmem_remove_lmb_update(lmb);
+               }
+       }
+
+       return rc;
+}
+
 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 {
        struct drmem_lmb *lmb, *start_lmb, *end_lmb;
@@ -646,6 +670,10 @@ static int dlpar_memory_readd_by_index(u32 drc_index)
 {
        return -EOPNOTSUPP;
 }
+static int dlpar_memory_readd_multiple(void)
+{
+       return -EOPNOTSUPP;
+}
 
 static int dlpar_memory_remove_by_ic(u32 lmbs_to_remove, u32 drc_index)
 {
@@ -923,6 +951,9 @@ int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
                drc_index = hp_elog->_drc_u.drc_index;
                rc = dlpar_memory_readd_by_index(drc_index);
                break;
+       case PSERIES_HP_ELOG_ACTION_READD_MULTIPLE:
+               rc = dlpar_memory_readd_multiple();
+               break;
        default:
                pr_err("Invalid action (%d) specified\n", hp_elog->action);
                rc = -EINVAL;