[src/trunk]: src/sys/arch/arm/arm32 Deal with bus_dmamem_unmap of direct mapp...

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8921129bafcd
branches:  trunk
changeset: 795135:8921129bafcd
user:      matt <matt%NetBSD.org@localhost>
date:      Wed Apr 02 12:28:54 2014 +0000

description:
Deal with bus_dmamem_unmap of direct mapped KVA.

diffstat:

 sys/arch/arm/arm32/bus_dma.c |  26 +++++++++++++++++++++-----
 1 files changed, 21 insertions(+), 5 deletions(-)

diffs (61 lines):

diff -r 4fbba4369e1c -r 8921129bafcd sys/arch/arm/arm32/bus_dma.c
--- a/sys/arch/arm/arm32/bus_dma.c      Wed Apr 02 12:04:09 2014 +0000
+++ b/sys/arch/arm/arm32/bus_dma.c      Wed Apr 02 12:28:54 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bus_dma.c,v 1.83 2014/03/24 20:06:31 christos Exp $    */
+/*     $NetBSD: bus_dma.c,v 1.84 2014/04/02 12:28:54 matt Exp $        */
 
 /*-
  * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@@ -35,13 +35,15 @@
 #include "opt_arm_bus_space.h"
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.83 2014/03/24 20:06:31 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.84 2014/04/02 12:28:54 matt Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
 #include <sys/proc.h>
 #include <sys/buf.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
 #include <sys/reboot.h>
 #include <sys/conf.h>
 #include <sys/file.h>
@@ -52,10 +54,11 @@
 
 #include <uvm/uvm.h>
 
-#include <sys/bus.h>
-#include <machine/cpu.h>
+#include <arm/cpufunc.h>
 
-#include <arm/cpufunc.h>
+#ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
+#include <dev/mm.h>
+#endif
 
 #ifdef BUSDMA_COUNTERS
 static struct evcnt bus_dma_creates =
@@ -1391,6 +1394,19 @@
        KASSERTMSG(((uintptr_t)kva & PAGE_MASK) == 0,
            "kva %p (%#"PRIxPTR")", kva, ((uintptr_t)kva & PAGE_MASK));
 
+#ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS
+       /*
+        * Check to see if this used direct mapped memory.  Get it's physical
+        * address and try to map it.  If the resultant matches the kva, then
+        * it was and so we can just return since we have notice to free up.
+        */
+       paddr_t pa;
+       vaddr_t va;
+       (void)pmap_extract(pmap_kernel(), (vaddr_t)kva, &pa);
+       if (mm_md_direct_mapped_phys(pa, &va) && va == (vaddr_t)kva)
+               return;
+#endif
+
        size = round_page(size);
        pmap_kremove((vaddr_t)kva, size);
        pmap_update(pmap_kernel());