svn commit: r207419 - head/sys/i386/xen

Kip Macy kmacy at FreeBSD.org
Fri Apr 30 03:26:12 UTC 2010


Author: kmacy
Date: Fri Apr 30 03:26:12 2010
New Revision: 207419
URL: http://svn.freebsd.org/changeset/base/207419

Log:
  merge 194209 in to the i386/xen pmap
  
  requested by: alc@

Modified:
  head/sys/i386/xen/pmap.c

Modified: head/sys/i386/xen/pmap.c
==============================================================================
--- head/sys/i386/xen/pmap.c	Fri Apr 30 03:15:00 2010	(r207418)
+++ head/sys/i386/xen/pmap.c	Fri Apr 30 03:26:12 2010	(r207419)
@@ -289,6 +289,12 @@ SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_
 	"Max number of PV entries");
 SYSCTL_INT(_vm_pmap, OID_AUTO, shpgperproc, CTLFLAG_RD, &shpgperproc, 0,
 	"Page share factor per proc");
+SYSCTL_NODE(_vm_pmap, OID_AUTO, pde, CTLFLAG_RD, 0,
+    "2/4MB page mapping counters");
+
+static u_long pmap_pde_mappings;
+SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, mappings, CTLFLAG_RD,
+    &pmap_pde_mappings, 0, "2/4MB page mappings");
 
 static void	free_pv_entry(pmap_t pmap, pv_entry_t pv);
 static pv_entry_t get_pv_entry(pmap_t locked_pmap, int try);
@@ -3130,64 +3136,59 @@ pmap_object_init_pt(pmap_t pmap, vm_offs
 		    vm_object_t object, vm_pindex_t pindex,
 		    vm_size_t size)
 {
+	pd_entry_t *pde;
+	vm_paddr_t pa, ptepa;
 	vm_page_t p;
+	int pat_mode;
 
 	VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
 	KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG,
 	    ("pmap_object_init_pt: non-device object"));
 	if (pseflag && 
-	    ((addr & (NBPDR - 1)) == 0) && ((size & (NBPDR - 1)) == 0)) {
-		int i;
-		vm_page_t m[1];
-		unsigned int ptepindex;
-		int npdes;
-		pd_entry_t ptepa;
-
-		PMAP_LOCK(pmap);
-		if (pmap->pm_pdir[ptepindex = (addr >> PDRSHIFT)])
-			goto out;
-		PMAP_UNLOCK(pmap);
-retry:
+	    (addr & (NBPDR - 1)) == 0 && (size & (NBPDR - 1)) == 0) {
+		if (!vm_object_populate(object, pindex, pindex + atop(size)))
+			return;
 		p = vm_page_lookup(object, pindex);
-		if (p != NULL) {
-			if (vm_page_sleep_if_busy(p, FALSE, "init4p"))
-				goto retry;
-		} else {
-			p = vm_page_alloc(object, pindex, VM_ALLOC_NORMAL);
-			if (p == NULL)
-				return;
-			m[0] = p;
-
-			if (vm_pager_get_pages(object, m, 1, 0) != VM_PAGER_OK) {
-				vm_page_lock_queues();
-				vm_page_free(p);
-				vm_page_unlock_queues();
-				return;
-			}
-
-			p = vm_page_lookup(object, pindex);
-			vm_page_wakeup(p);
-		}
-
+		KASSERT(p->valid == VM_PAGE_BITS_ALL,
+		    ("pmap_object_init_pt: invalid page %p", p));
+		pat_mode = p->md.pat_mode;
+		/*
+		 * Abort the mapping if the first page is not physically
+		 * aligned to a 2/4MB page boundary.
+		 */
 		ptepa = VM_PAGE_TO_PHYS(p);
 		if (ptepa & (NBPDR - 1))
 			return;
-
-		p->valid = VM_PAGE_BITS_ALL;
-
+		/*
+		 * Skip the first page.  Abort the mapping if the rest of
+		 * the pages are not physically contiguous or have differing
+		 * memory attributes.
+		 */
+		p = TAILQ_NEXT(p, listq);
+		for (pa = ptepa + PAGE_SIZE; pa < ptepa + size;
+		    pa += PAGE_SIZE) {
+			KASSERT(p->valid == VM_PAGE_BITS_ALL,
+			    ("pmap_object_init_pt: invalid page %p", p));
+			if (pa != VM_PAGE_TO_PHYS(p) ||
+			    pat_mode != p->md.pat_mode)
+				return;
+			p = TAILQ_NEXT(p, listq);
+		}
+		/* Map using 2/4MB pages. */
 		PMAP_LOCK(pmap);
-		pmap->pm_stats.resident_count += size >> PAGE_SHIFT;
-		npdes = size >> PDRSHIFT;
-		critical_enter();
-		for(i = 0; i < npdes; i++) {
-			PD_SET_VA(pmap, ptepindex,
-			    ptepa | PG_U | PG_M | PG_RW | PG_V | PG_PS, FALSE);
-			ptepa += NBPDR;
-			ptepindex += 1;
+		for (pa = ptepa | pmap_cache_bits(pat_mode, 1); pa < ptepa +
+		    size; pa += NBPDR) {
+			pde = pmap_pde(pmap, addr);
+			if (*pde == 0) {
+				pde_store(pde, pa | PG_PS | PG_M | PG_A |
+				    PG_U | PG_RW | PG_V);
+				pmap->pm_stats.resident_count += NBPDR /
+				    PAGE_SIZE;
+				pmap_pde_mappings++;
+			}
+			/* Else continue on if the PDE is already valid. */
+			addr += NBPDR;
 		}
-		pmap_invalidate_all(pmap);
-		critical_exit();
-out:
 		PMAP_UNLOCK(pmap);
 	}
 }


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