[POWERPC] Add code for removing HPTEs for parts of the linear mapping

For memory remove, we need to clean up htab mappings for the
section of the memory we are removing.

This implements support for removing htab bolted mappings for pSeries
logical partitions.  Other sub-archs may need to implement similar
functionality for hotplug memory remove to work on them.

Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 9a455d46379d..233d9be25f49 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -520,6 +520,20 @@ static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
         BUG_ON(lpar_rc != H_SUCCESS);
 }
 
+static void pSeries_lpar_hpte_removebolted(unsigned long ea,
+                                           int psize, int ssize)
+{
+        unsigned long slot, vsid, va;
+
+        vsid = get_kernel_vsid(ea, ssize);
+        va = hpt_va(ea, vsid, ssize);
+
+        slot = pSeries_lpar_hpte_find(va, psize, ssize);
+        BUG_ON(slot == -1);
+
+        pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0);
+}
+
 /* Flag bits for H_BULK_REMOVE */
 #define HBR_REQUEST     0x4000000000000000UL
 #define HBR_RESPONSE    0x8000000000000000UL
@@ -597,6 +611,7 @@ void __init hpte_init_lpar(void)
         ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
         ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
         ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
+        ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted;
         ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
         ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
 }