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[src/trunk]: src/sys/arch/arm/arm32 Simplify the _ARM32_NEED_BUS_DMA_BOUNCE #...
details: https://anonhg.NetBSD.org/src/rev/21881b7d6eaf
branches: trunk
changeset: 451999:21881b7d6eaf
user: skrll <skrll%NetBSD.org@localhost>
date: Fri Jun 14 09:09:12 2019 +0000
description:
Simplify the _ARM32_NEED_BUS_DMA_BOUNCE #ifdefs and rely on compiler
optimisation of the bouncing = false case.
Drain the write buf (aka DSB) in more cases
Catch all CPUs that support speculation. (thunderx isn't CPU_CORTEX)
diffstat:
sys/arch/arm/arm32/bus_dma.c | 73 +++++++++++++++++++++++--------------------
1 files changed, 39 insertions(+), 34 deletions(-)
diffs (181 lines):
diff -r a71a696329d3 -r 21881b7d6eaf sys/arch/arm/arm32/bus_dma.c
--- a/sys/arch/arm/arm32/bus_dma.c Fri Jun 14 09:06:45 2019 +0000
+++ b/sys/arch/arm/arm32/bus_dma.c Fri Jun 14 09:09:12 2019 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: bus_dma.c,v 1.114 2019/06/08 11:57:27 skrll Exp $ */
+/* $NetBSD: bus_dma.c,v 1.115 2019/06/14 09:09:12 skrll Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@@ -36,7 +36,7 @@
#include "opt_cputypes.h"
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.114 2019/06/08 11:57:27 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.115 2019/06/14 09:09:12 skrll Exp $");
#include <sys/param.h>
#include <sys/bus.h>
@@ -254,12 +254,13 @@
return 0;
}
+static int _bus_dma_uiomove(void *buf, struct uio *uio, size_t n,
+ int direction);
+
#ifdef _ARM32_NEED_BUS_DMA_BOUNCE
static int _bus_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map,
bus_size_t size, int flags);
static void _bus_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map);
-static int _bus_dma_uiomove(void *buf, struct uio *uio, size_t n,
- int direction);
static int
_bus_dma_load_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
@@ -796,7 +797,7 @@
bool readonly_p)
{
-#if defined(ARM_MMU_EXTENDED) || defined(CPU_CORTEX)
+#if defined(ARM_MMU_EXTENDED)
/*
* No optimisations are available for readonly mbufs on armv6+, so
* assume it's not readonly from here on.
@@ -863,7 +864,8 @@
cpu_sdcache_wb_range(va, pa, len);
break;
-#ifdef CPU_CORTEX
+#if defined(CPU_CORTEX) || defined(CPU_ARMV8)
+
/*
* Cortex CPUs can do speculative loads so we need to clean the cache
* after a DMA read to deal with any speculatively loaded cache lines.
@@ -1074,22 +1076,23 @@
#endif
const int pre_ops = ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
-#ifdef CPU_CORTEX
+#if defined(CPU_CORTEX) || defined(CPU_ARMV8)
const int post_ops = ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
#else
const int post_ops = 0;
#endif
- if (!bouncing) {
- if (pre_ops == 0 && post_ops == BUS_DMASYNC_POSTWRITE) {
- STAT_INCR(sync_postwrite);
- return;
- } else if (pre_ops == 0 && post_ops == 0) {
- return;
- }
+ if (pre_ops == 0 && post_ops == 0)
+ return;
+
+ if (post_ops == BUS_DMASYNC_POSTWRITE) {
+ KASSERT(pre_ops == 0);
+ STAT_INCR(sync_postwrite);
+ return;
}
+
KASSERTMSG(bouncing || pre_ops != 0 || (post_ops & BUS_DMASYNC_POSTREAD),
"pre_ops %#x post_ops %#x", pre_ops, post_ops);
-#ifdef _ARM32_NEED_BUS_DMA_BOUNCE
+
if (bouncing && (ops & BUS_DMASYNC_PREWRITE)) {
struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie;
STAT_INCR(write_bounces);
@@ -1123,23 +1126,28 @@
#endif /* DIAGNOSTIC */
}
}
-#endif /* _ARM32_NEED_BUS_DMA_BOUNCE */
- /* Skip cache frobbing if mapping was COHERENT. */
- if (!bouncing && (map->_dm_flags & _BUS_DMAMAP_COHERENT)) {
- /* Drain the write buffer. */
- if (pre_ops & BUS_DMASYNC_PREWRITE)
+ /* Skip cache frobbing if mapping was COHERENT */
+ if ((map->_dm_flags & _BUS_DMAMAP_COHERENT)) {
+ /*
+ * Drain the write buffer of DMA operators.
+ * 1) when cpu->device (prewrite)
+ * 2) when device->cpu (postread)
+ */
+ if ((pre_ops & BUS_DMASYNC_PREWRITE) || (post_ops & BUS_DMASYNC_POSTREAD))
cpu_drain_writebuf();
+
+ /*
+ * Only thing left to do for COHERENT mapping is copy from bounce
+ * in the POSTREAD case.
+ */
+ if (bouncing && (post_ops & BUS_DMASYNC_POSTREAD))
+ goto bounce_it;
+
return;
}
-#ifdef _ARM32_NEED_BUS_DMA_BOUNCE
- if (bouncing && ((map->_dm_flags & _BUS_DMAMAP_COHERENT) || pre_ops == 0)) {
- goto bounce_it;
- }
-#endif /* _ARM32_NEED_BUS_DMA_BOUNCE */
-
-#ifndef ARM_MMU_EXTENDED
+#if !defined( ARM_MMU_EXTENDED)
/*
* If the mapping belongs to a non-kernel vmspace, and the
* vmspace has not been active since the last time a full
@@ -1151,11 +1159,9 @@
#endif
int buftype = map->_dm_buftype;
-#ifdef _ARM32_NEED_BUS_DMA_BOUNCE
if (bouncing) {
buftype = _BUS_DMA_BUFTYPE_LINEAR;
}
-#endif
switch (buftype) {
case _BUS_DMA_BUFTYPE_LINEAR:
@@ -1186,14 +1192,14 @@
/* Drain the write buffer. */
cpu_drain_writebuf();
-#ifdef _ARM32_NEED_BUS_DMA_BOUNCE
- bounce_it:
if (!bouncing || (ops & BUS_DMASYNC_POSTREAD) == 0)
return;
+ bounce_it:
+ STAT_INCR(read_bounces);
+
struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie;
char * const dataptr = (char *)cookie->id_bouncebuf + offset;
- STAT_INCR(read_bounces);
/*
* Copy the bounce buffer to the caller's buffer.
*/
@@ -1224,7 +1230,6 @@
break;
#endif
}
-#endif /* _ARM32_NEED_BUS_DMA_BOUNCE */
}
/*
@@ -1749,6 +1754,7 @@
cookie->id_nbouncesegs = 0;
cookie->id_flags &= ~_BUS_DMA_HAS_BOUNCE;
}
+#endif /* _ARM32_NEED_BUS_DMA_BOUNCE */
/*
* This function does the same as uiomove, but takes an explicit
@@ -1792,7 +1798,6 @@
}
return 0;
}
-#endif /* _ARM32_NEED_BUS_DMA_BOUNCE */
int
_bus_dmatag_subregion(bus_dma_tag_t tag, bus_addr_t min_addr,
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