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driver core: lift dma_default_coherent into common code

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Lift the dma_default_coherent variable from the mips architecture code
to the driver core.  This allows an architecture to sdefault all device
to be DMA coherent at run time, even if the kernel is build with support
for DMA noncoherent device.  By allowing device_initialize to set the
->dma_coherent field to this default the amount of arch hooks required
for this behavior can be greatly reduced.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Christoph Hellwig 2021-02-10 10:56:39 +01:00 committed by Thomas Bogendoerfer
parent 14ac09a65e
commit 6d4e9a8efe
13 changed files with 14 additions and 39 deletions
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1
arch/mips/Kconfig
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@ -1163,7 +1163,6 @@ config ARCH_SUPPORTS_UPROBES
bool
config DMA_MAYBE_COHERENT
select ARCH_HAS_DMA_COHERENCE_H
select DMA_NONCOHERENT
bool

2
arch/mips/alchemy/common/setup.c
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@ -28,8 +28,8 @@
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <asm/dma-coherence.h>
#include <asm/mipsregs.h>
#include <au1000.h>

22
arch/mips/include/asm/dma-coherence.h
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@ -1,22 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org>
*
*/
#ifndef __ASM_DMA_COHERENCE_H
#define __ASM_DMA_COHERENCE_H
#ifdef CONFIG_DMA_MAYBE_COHERENT
extern bool dma_default_coherent;
static inline bool dev_is_dma_coherent(struct device *dev)
{
return dma_default_coherent;
}
#else
#define dma_default_coherent (!IS_ENABLED(CONFIG_DMA_NONCOHERENT))
#endif
#endif

4
arch/mips/kernel/setup.c
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@ -36,7 +36,6 @@
#include <asm/cdmm.h>
#include <asm/cpu.h>
#include <asm/debug.h>
#include <asm/dma-coherence.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/smp-ops.h>
@ -803,9 +802,6 @@ arch_initcall(debugfs_mips);
#endif
#ifdef CONFIG_DMA_MAYBE_COHERENT
bool dma_default_coherent;
EXPORT_SYMBOL_GPL(dma_default_coherent);
static int __init setcoherentio(char *str)
{
dma_default_coherent = true;

2
arch/mips/mm/c-r4k.c
View File

@ -19,6 +19,7 @@
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/bitops.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <asm/bcache.h>
#include <asm/bootinfo.h>
@ -35,7 +36,6 @@
#include <asm/war.h>
#include <asm/cacheflush.h> /* for run_uncached() */
#include <asm/traps.h>
#include <asm/dma-coherence.h>
#include <asm/mips-cps.h>
/*

1
arch/mips/mm/dma-noncoherent.c
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@ -10,7 +10,6 @@
#include <asm/cache.h>
#include <asm/cpu-type.h>
#include <asm/dma-coherence.h>
#include <asm/io.h>
/*

2
arch/mips/mti-malta/malta-setup.c
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@ -13,8 +13,8 @@
#include <linux/pci.h>
#include <linux/screen_info.h>
#include <linux/time.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <asm/dma-coherence.h>
#include <asm/fw/fw.h>
#include <asm/mips-cps.h>
#include <asm/mips-boards/generic.h>

2
arch/mips/pci/pci-alchemy.c
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@ -17,8 +17,8 @@
#include <linux/init.h>
#include <linux/syscore_ops.h>
#include <linux/vmalloc.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include <asm/dma-coherence.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/tlbmisc.h>

1
arch/mips/pistachio/init.c
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@ -13,7 +13,6 @@
#include <linux/of_fdt.h>
#include <asm/cacheflush.h>
#include <asm/dma-coherence.h>
#include <asm/fw/fw.h>
#include <asm/mips-boards/generic.h>
#include <asm/mips-cps.h>

6
drivers/base/core.c
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@ -28,6 +28,7 @@
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
#include <linux/sysfs.h>
#include <linux/dma-map-ops.h> /* for dma_default_coherent */
#include "base.h"
#include "power/power.h"
@ -2585,6 +2586,11 @@ void device_initialize(struct device *dev)
INIT_LIST_HEAD(&dev->links.suppliers);
INIT_LIST_HEAD(&dev->links.defer_sync);
dev->links.status = DL_DEV_NO_DRIVER;
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
dev->dma_coherent = dma_default_coherent;
#endif
}
EXPORT_SYMBOL_GPL(device_initialize);

5
include/linux/dma-map-ops.h
View File

@ -229,11 +229,10 @@ bool dma_free_from_pool(struct device *dev, void *start, size_t size);
int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start,
dma_addr_t dma_start, u64 size);
#ifdef CONFIG_ARCH_HAS_DMA_COHERENCE_H
#include <asm/dma-coherence.h>
#elif defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
extern bool dma_default_coherent;
static inline bool dev_is_dma_coherent(struct device *dev)
{
return dev->dma_coherent;

3
kernel/dma/Kconfig
View File

@ -33,9 +33,6 @@ config NEED_DMA_MAP_STATE
config ARCH_DMA_ADDR_T_64BIT
def_bool 64BIT || PHYS_ADDR_T_64BIT
config ARCH_HAS_DMA_COHERENCE_H
bool
config ARCH_HAS_DMA_SET_MASK
bool

2
kernel/dma/mapping.c
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@ -16,6 +16,8 @@
#include "debug.h"
#include "direct.h"
bool dma_default_coherent;
/*
* Managed DMA API
*/