svn commit: r249772 - projects/amd64_xen_pv/sys/amd64/xen

[Cherry G. Mathew]

Author: cherry
Date: Mon Apr 22 18:35:04 2013
New Revision: 249772
URL: http://svnweb.freebsd.org/changeset/base/249772

Log:
  Add new function to iterate through all
  p->v mappings in a given pmap.
  
  Approved by: gibbs(implicit)

Modified:
  projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.c
  projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.h

Modified: projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.c
==============================================================================
--- projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.c	Mon Apr 22 18:31:39 2013	(r249771)
+++ projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.c	Mon Apr 22 18:35:04 2013	(r249772)
@@ -159,6 +159,8 @@ pv_to_chunk(pv_entry_t pv)
 #define	PC_FREE1	0xfffffffffffffffful
 #define	PC_FREE2	0x000000fffffffffful
 
+static const uint64_t pc_freemask[_NPCM] = { PC_FREE0, PC_FREE1, PC_FREE2 };
+
 /*
  * Returns a new PV entry, allocating a new PV chunk from the system when
  * needed.  If this PV chunk allocation fails and a PV list lock pointer was
@@ -458,7 +460,8 @@ pmap_pv_vm_page_mapped(pmap_t pmap, vm_p
 }
 
 /*
- * Iterate through all mappings, until callback returns 'true'
+ * Iterate through all va mappings a physical page is part of, until
+ * callback returns 'true'. 
  * Returns the number of iterations.
  */
 
@@ -479,6 +482,47 @@ pmap_pv_iterate(vm_page_t m, pv_cb_t cb)
 }
 
 /*
+ * Iterate through all pv mappings in a pmap, until callback returns
+ * 'true'.
+ * Returns the number of iterations.
+ */
+
+int
+pmap_pv_iterate_map(pmap_t pmap, pv_cb_t cb)
+{
+	int iter = 0;
+
+	int field, idx;
+	int64_t bit;
+	uint64_t inuse, bitmask;
+	pv_entry_t pv;
+	struct pv_chunk *pc, *npc;
+
+	PMAP_LOCK_ASSERT(pmap, MA_OWNED);
+
+	TAILQ_FOREACH_SAFE(pc, &pmap->pm_pvchunk, pc_list, npc) {
+		iter++;
+		for (field = 0; field < _NPCM; field++) {
+			inuse = ~pc->pc_map[field] & pc_freemask[field];
+			while (inuse != 0) {
+				bit = bsfq(inuse);
+				bitmask = 1UL << bit;
+				idx = field * 64 + bit;
+				pv = &pc->pc_pventry[idx];
+				inuse &= ~bitmask;
+
+				if (cb(PV_PMAP(pv), pv->pv_va, NULL)) break;
+			}
+			if (TAILQ_EMPTY(&pmap->pm_pvchunk)) {
+				/* Chunks were all freed! Bail. */
+				break;
+			}
+		}
+	}
+	return iter;
+}
+
+/*
  * Destroy all pv mappings for a given physical page.
  */
 void

Modified: projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.h
==============================================================================
--- projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.h	Mon Apr 22 18:31:39 2013	(r249771)
+++ projects/amd64_xen_pv/sys/amd64/xen/pmap_pv.h	Mon Apr 22 18:35:04 2013	(r249772)
@@ -52,6 +52,7 @@ bool pmap_put_pv_entry(pmap_t pmap, vm_o
 bool pmap_free_pv_entry(pmap_t pmap, vm_offset_t va, vm_page_t m);
 pv_entry_t pmap_find_pv_entry(pmap_t pmap, vm_offset_t va, vm_page_t m);
 int pmap_pv_iterate(vm_page_t m, pv_cb_t cb);
+int pmap_pv_iterate_map(pmap_t pmap, pv_cb_t cb);
 void pmap_pv_page_unmap(vm_page_t m);
 
 #endif /* !_MACHINE_PMAP_PV_H_ */