2005-06-23 23:01:16 -06:00
|
|
|
/*
|
|
|
|
* DMA coherent memory allocation.
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|
|
|
*
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|
|
|
* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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|
* option) any later version.
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*
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* Copyright (C) 2002 - 2005 Tensilica Inc.
|
2015-05-24 21:55:05 -06:00
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* Copyright (C) 2015 Cadence Design Systems Inc.
|
2005-06-23 23:01:16 -06:00
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*
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* Based on version for i386.
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*
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* Chris Zankel <chris@zankel.net>
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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*/
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2016-04-25 13:08:52 -06:00
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#include <linux/dma-contiguous.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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|
#include <linux/gfp.h>
|
2015-10-08 17:44:23 -06:00
|
|
|
#include <linux/highmem.h>
|
|
|
|
#include <linux/mm.h>
|
2012-09-16 19:44:56 -06:00
|
|
|
#include <linux/module.h>
|
2015-10-08 17:44:23 -06:00
|
|
|
#include <linux/pci.h>
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|
|
|
#include <linux/string.h>
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|
|
|
#include <linux/types.h>
|
2005-06-23 23:01:16 -06:00
|
|
|
#include <asm/cacheflush.h>
|
2015-10-08 17:44:23 -06:00
|
|
|
#include <asm/io.h>
|
2005-06-23 23:01:16 -06:00
|
|
|
|
2015-10-08 17:44:23 -06:00
|
|
|
static void do_cache_op(dma_addr_t dma_handle, size_t size,
|
|
|
|
void (*fn)(unsigned long, unsigned long))
|
|
|
|
{
|
|
|
|
unsigned long off = dma_handle & (PAGE_SIZE - 1);
|
|
|
|
unsigned long pfn = PFN_DOWN(dma_handle);
|
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|
|
struct page *page = pfn_to_page(pfn);
|
|
|
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|
|
|
if (!PageHighMem(page))
|
|
|
|
fn((unsigned long)bus_to_virt(dma_handle), size);
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|
|
|
else
|
|
|
|
while (size > 0) {
|
|
|
|
size_t sz = min_t(size_t, size, PAGE_SIZE - off);
|
|
|
|
void *vaddr = kmap_atomic(page);
|
|
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|
|
fn((unsigned long)vaddr + off, sz);
|
|
|
|
kunmap_atomic(vaddr);
|
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|
|
off = 0;
|
|
|
|
++page;
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|
|
|
size -= sz;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
static void xtensa_sync_single_for_cpu(struct device *dev,
|
|
|
|
dma_addr_t dma_handle, size_t size,
|
|
|
|
enum dma_data_direction dir)
|
|
|
|
{
|
|
|
|
switch (dir) {
|
|
|
|
case DMA_BIDIRECTIONAL:
|
|
|
|
case DMA_FROM_DEVICE:
|
2015-10-08 17:44:23 -06:00
|
|
|
do_cache_op(dma_handle, size, __invalidate_dcache_range);
|
2015-05-24 21:55:05 -06:00
|
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|
break;
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|
case DMA_NONE:
|
|
|
|
BUG();
|
|
|
|
break;
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|
default:
|
|
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|
break;
|
|
|
|
}
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|
}
|
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|
static void xtensa_sync_single_for_device(struct device *dev,
|
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|
dma_addr_t dma_handle, size_t size,
|
|
|
|
enum dma_data_direction dir)
|
|
|
|
{
|
|
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|
switch (dir) {
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|
|
|
case DMA_BIDIRECTIONAL:
|
|
|
|
case DMA_TO_DEVICE:
|
2015-10-08 17:44:23 -06:00
|
|
|
if (XCHAL_DCACHE_IS_WRITEBACK)
|
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|
do_cache_op(dma_handle, size, __flush_dcache_range);
|
2015-05-24 21:55:05 -06:00
|
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|
break;
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|
case DMA_NONE:
|
|
|
|
BUG();
|
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|
break;
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|
default:
|
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|
break;
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|
|
|
}
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|
|
|
}
|
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|
|
|
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|
|
static void xtensa_sync_sg_for_cpu(struct device *dev,
|
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|
|
struct scatterlist *sg, int nents,
|
|
|
|
enum dma_data_direction dir)
|
|
|
|
{
|
|
|
|
struct scatterlist *s;
|
|
|
|
int i;
|
|
|
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|
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|
for_each_sg(sg, s, nents, i) {
|
|
|
|
xtensa_sync_single_for_cpu(dev, sg_dma_address(s),
|
|
|
|
sg_dma_len(s), dir);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xtensa_sync_sg_for_device(struct device *dev,
|
|
|
|
struct scatterlist *sg, int nents,
|
|
|
|
enum dma_data_direction dir)
|
|
|
|
{
|
|
|
|
struct scatterlist *s;
|
|
|
|
int i;
|
|
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|
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|
for_each_sg(sg, s, nents, i) {
|
|
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|
xtensa_sync_single_for_device(dev, sg_dma_address(s),
|
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|
|
sg_dma_len(s), dir);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2005-06-23 23:01:16 -06:00
|
|
|
/*
|
|
|
|
* Note: We assume that the full memory space is always mapped to 'kseg'
|
|
|
|
* Otherwise we have to use page attributes (not implemented).
|
|
|
|
*/
|
|
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|
|
2015-05-24 21:55:05 -06:00
|
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|
static void *xtensa_dma_alloc(struct device *dev, size_t size,
|
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|
|
dma_addr_t *handle, gfp_t flag,
|
2016-08-03 14:46:00 -06:00
|
|
|
unsigned long attrs)
|
2005-06-23 23:01:16 -06:00
|
|
|
{
|
2006-12-10 03:18:48 -07:00
|
|
|
unsigned long ret;
|
|
|
|
unsigned long uncached = 0;
|
2016-04-25 13:08:52 -06:00
|
|
|
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
|
|
|
struct page *page = NULL;
|
2005-06-23 23:01:16 -06:00
|
|
|
|
|
|
|
/* ignore region speicifiers */
|
|
|
|
|
2006-12-10 03:18:48 -07:00
|
|
|
flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
|
2005-06-23 23:01:16 -06:00
|
|
|
|
2006-12-10 03:18:48 -07:00
|
|
|
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
|
|
|
|
flag |= GFP_DMA;
|
|
|
|
|
2016-04-25 13:08:52 -06:00
|
|
|
if (gfpflags_allow_blocking(flag))
|
2017-02-24 15:58:44 -07:00
|
|
|
page = dma_alloc_from_contiguous(dev, count, get_order(size),
|
|
|
|
flag);
|
2016-04-25 13:08:52 -06:00
|
|
|
|
|
|
|
if (!page)
|
|
|
|
page = alloc_pages(flag, get_order(size));
|
|
|
|
|
|
|
|
if (!page)
|
2006-12-10 03:18:48 -07:00
|
|
|
return NULL;
|
|
|
|
|
2016-04-25 13:08:52 -06:00
|
|
|
ret = (unsigned long)page_address(page);
|
|
|
|
|
2006-12-10 03:18:48 -07:00
|
|
|
/* We currently don't support coherent memory outside KSEG */
|
|
|
|
|
2014-07-23 04:06:40 -06:00
|
|
|
BUG_ON(ret < XCHAL_KSEG_CACHED_VADDR ||
|
|
|
|
ret > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1);
|
2006-12-10 03:18:48 -07:00
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
uncached = ret + XCHAL_KSEG_BYPASS_VADDR - XCHAL_KSEG_CACHED_VADDR;
|
|
|
|
*handle = virt_to_bus((void *)ret);
|
|
|
|
__invalidate_dcache_range(ret, size);
|
2006-12-10 03:18:48 -07:00
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
return (void *)uncached;
|
2005-06-23 23:01:16 -06:00
|
|
|
}
|
|
|
|
|
2016-04-25 13:08:52 -06:00
|
|
|
static void xtensa_dma_free(struct device *dev, size_t size, void *vaddr,
|
2016-08-03 14:46:00 -06:00
|
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
2005-06-23 23:01:16 -06:00
|
|
|
{
|
2014-07-23 04:06:40 -06:00
|
|
|
unsigned long addr = (unsigned long)vaddr +
|
|
|
|
XCHAL_KSEG_CACHED_VADDR - XCHAL_KSEG_BYPASS_VADDR;
|
2016-04-25 13:08:52 -06:00
|
|
|
struct page *page = virt_to_page(addr);
|
|
|
|
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
|
2006-12-10 03:18:48 -07:00
|
|
|
|
2014-07-23 04:06:40 -06:00
|
|
|
BUG_ON(addr < XCHAL_KSEG_CACHED_VADDR ||
|
|
|
|
addr > XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_SIZE - 1);
|
2006-12-10 03:18:48 -07:00
|
|
|
|
2016-04-25 13:08:52 -06:00
|
|
|
if (!dma_release_from_contiguous(dev, page, count))
|
|
|
|
__free_pages(page, get_order(size));
|
2005-06-23 23:01:16 -06:00
|
|
|
}
|
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
static dma_addr_t xtensa_map_page(struct device *dev, struct page *page,
|
|
|
|
unsigned long offset, size_t size,
|
|
|
|
enum dma_data_direction dir,
|
2016-08-03 14:46:00 -06:00
|
|
|
unsigned long attrs)
|
2015-05-24 21:55:05 -06:00
|
|
|
{
|
|
|
|
dma_addr_t dma_handle = page_to_phys(page) + offset;
|
|
|
|
|
2016-12-14 16:05:21 -07:00
|
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
|
|
xtensa_sync_single_for_device(dev, dma_handle, size, dir);
|
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
return dma_handle;
|
|
|
|
}
|
2005-06-23 23:01:16 -06:00
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
static void xtensa_unmap_page(struct device *dev, dma_addr_t dma_handle,
|
|
|
|
size_t size, enum dma_data_direction dir,
|
2016-08-03 14:46:00 -06:00
|
|
|
unsigned long attrs)
|
2005-06-23 23:01:16 -06:00
|
|
|
{
|
2016-12-14 16:05:21 -07:00
|
|
|
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
|
|
|
|
xtensa_sync_single_for_cpu(dev, dma_handle, size, dir);
|
2015-05-24 21:55:05 -06:00
|
|
|
}
|
2005-06-23 23:01:16 -06:00
|
|
|
|
2015-05-24 21:55:05 -06:00
|
|
|
static int xtensa_map_sg(struct device *dev, struct scatterlist *sg,
|
|
|
|
int nents, enum dma_data_direction dir,
|
2016-08-03 14:46:00 -06:00
|
|
|
unsigned long attrs)
|
2015-05-24 21:55:05 -06:00
|
|
|
{
|
|
|
|
struct scatterlist *s;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for_each_sg(sg, s, nents, i) {
|
|
|
|
s->dma_address = xtensa_map_page(dev, sg_page(s), s->offset,
|
|
|
|
s->length, dir, attrs);
|
|
|
|
}
|
|
|
|
return nents;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void xtensa_unmap_sg(struct device *dev,
|
|
|
|
struct scatterlist *sg, int nents,
|
|
|
|
enum dma_data_direction dir,
|
2016-08-03 14:46:00 -06:00
|
|
|
unsigned long attrs)
|
2015-05-24 21:55:05 -06:00
|
|
|
{
|
|
|
|
struct scatterlist *s;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for_each_sg(sg, s, nents, i) {
|
|
|
|
xtensa_unmap_page(dev, sg_dma_address(s),
|
|
|
|
sg_dma_len(s), dir, attrs);
|
2005-06-23 23:01:16 -06:00
|
|
|
}
|
|
|
|
}
|
2015-05-24 21:55:05 -06:00
|
|
|
|
|
|
|
int xtensa_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-01-20 14:04:01 -07:00
|
|
|
const struct dma_map_ops xtensa_dma_map_ops = {
|
2015-05-24 21:55:05 -06:00
|
|
|
.alloc = xtensa_dma_alloc,
|
|
|
|
.free = xtensa_dma_free,
|
|
|
|
.map_page = xtensa_map_page,
|
|
|
|
.unmap_page = xtensa_unmap_page,
|
|
|
|
.map_sg = xtensa_map_sg,
|
|
|
|
.unmap_sg = xtensa_unmap_sg,
|
|
|
|
.sync_single_for_cpu = xtensa_sync_single_for_cpu,
|
|
|
|
.sync_single_for_device = xtensa_sync_single_for_device,
|
|
|
|
.sync_sg_for_cpu = xtensa_sync_sg_for_cpu,
|
|
|
|
.sync_sg_for_device = xtensa_sync_sg_for_device,
|
|
|
|
.mapping_error = xtensa_dma_mapping_error,
|
|
|
|
};
|
|
|
|
EXPORT_SYMBOL(xtensa_dma_map_ops);
|
|
|
|
|
|
|
|
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
|
|
|
|
|
|
|
|
static int __init xtensa_dma_init(void)
|
|
|
|
{
|
|
|
|
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
fs_initcall(xtensa_dma_init);
|