[src/trunk]: src/sys/external/bsd/drm2/drm Need sync after a series of dcbf's...

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

details:   https://anonhg.NetBSD.org/src/rev/624fb1841289
branches:  trunk
changeset: 366398:624fb1841289
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Mon Aug 27 15:23:57 2018 +0000

description:
Need sync after a series of dcbf's on powerpc.

diffstat:

 sys/external/bsd/drm2/drm/drm_cache.c |  36 +++++++++++++++++++++++++++++-----
 1 files changed, 30 insertions(+), 6 deletions(-)

diffs (110 lines):

diff -r 81a5bc5b8b0d -r 624fb1841289 sys/external/bsd/drm2/drm/drm_cache.c
--- a/sys/external/bsd/drm2/drm/drm_cache.c     Mon Aug 27 15:23:40 2018 +0000
+++ b/sys/external/bsd/drm2/drm/drm_cache.c     Mon Aug 27 15:23:57 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: drm_cache.c,v 1.9 2018/08/27 15:11:46 riastradh Exp $  */
+/*     $NetBSD: drm_cache.c,v 1.10 2018/08/27 15:23:57 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.9 2018/08/27 15:11:46 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.10 2018/08/27 15:23:57 riastradh Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -49,6 +49,7 @@
 #if defined(DRM_CLFLUSH)
 static bool            drm_md_clflush_finegrained_p(void);
 static void            drm_md_clflush_all(void);
+static void            drm_md_clflush_commit(void);
 static void            drm_md_clflush_page(struct page *);
 static void            drm_md_clflush_virt_range(const void *, size_t);
 #endif
@@ -60,6 +61,7 @@
        if (drm_md_clflush_finegrained_p()) {
                while (npages--)
                        drm_md_clflush_page(pages[npages]);
+               drm_md_clflush_commit();
        } else {
                drm_md_clflush_all();
        }
@@ -76,6 +78,7 @@
                TAILQ_FOREACH(page, list, pageq.queue)
                        drm_md_clflush_page(container_of(page, struct page,
                                p_vmp));
+               drm_md_clflush_commit();
        } else {
                drm_md_clflush_all();
        }
@@ -86,10 +89,12 @@
 drm_clflush_page(struct page *page)
 {
 #if defined(DRM_CLFLUSH)
-       if (drm_md_clflush_finegrained_p())
+       if (drm_md_clflush_finegrained_p()) {
                drm_md_clflush_page(page);
-       else
+               drm_md_clflush_commit();
+       } else {
                drm_md_clflush_all();
+       }
 #endif
 }
 
@@ -97,10 +102,12 @@
 drm_clflush_virt_range(const void *vaddr, size_t nbytes)
 {
 #if defined(DRM_CLFLUSH)
-       if (drm_md_clflush_finegrained_p())
+       if (drm_md_clflush_finegrained_p()) {
                drm_md_clflush_virt_range(vaddr, nbytes);
-       else
+               drm_md_clflush_commit();
+       } else {
                drm_md_clflush_all();
+       }
 #endif
 }
 
@@ -140,6 +147,11 @@
 }
 
 static void
+drm_md_clflush_commit(void)
+{
+}
+
+static void
 drm_md_clflush_page(struct page *page)
 {
        void *const vaddr = kmap_atomic(page);
@@ -175,6 +187,12 @@
        asm volatile ("dcbf\t%0,%1" : : "b"(va), "r"(off));
 }
 
+static void
+drm_ppc_sync(void)
+{
+       asm volatile ("sync" ::: "memory");
+}
+
 static bool
 drm_md_clflush_finegrained_p(void)
 {
@@ -188,6 +206,12 @@
 }
 
 static void
+drm_md_clflush_commit(void)
+{
+       drm_ppc_sync();
+}
+
+static void
 drm_md_clflush_page(struct page *page)
 {
        void *const vaddr = kmap_atomic(page);