mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 09:46:43 +07:00
0abdd7a81b
Record actively mapped pages and provide an api for asserting a given
page is dma inactive before execution proceeds. Placing
debug_dma_assert_idle() in cow_user_page() flagged the violation of the
dma-api in the NET_DMA implementation (see commit 7787380336 "net_dma:
mark broken").
The implementation includes the capability to count, in a limited way,
repeat mappings of the same page that occur without an intervening
unmap. This 'overlap' counter is limited to the few bits of tag space
in a radix tree. This mechanism is added to mitigate false negative
cases where, for example, a page is dma mapped twice and
debug_dma_assert_idle() is called after the page is un-mapped once.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
195 lines
5.1 KiB
C
195 lines
5.1 KiB
C
/*
|
|
* Copyright (C) 2008 Advanced Micro Devices, Inc.
|
|
*
|
|
* Author: Joerg Roedel <joerg.roedel@amd.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef __DMA_DEBUG_H
|
|
#define __DMA_DEBUG_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct device;
|
|
struct scatterlist;
|
|
struct bus_type;
|
|
|
|
#ifdef CONFIG_DMA_API_DEBUG
|
|
|
|
extern void dma_debug_add_bus(struct bus_type *bus);
|
|
|
|
extern void dma_debug_init(u32 num_entries);
|
|
|
|
extern int dma_debug_resize_entries(u32 num_entries);
|
|
|
|
extern void debug_dma_map_page(struct device *dev, struct page *page,
|
|
size_t offset, size_t size,
|
|
int direction, dma_addr_t dma_addr,
|
|
bool map_single);
|
|
|
|
extern void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
|
|
|
|
extern void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
|
|
size_t size, int direction, bool map_single);
|
|
|
|
extern void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, int mapped_ents, int direction);
|
|
|
|
extern void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
|
int nelems, int dir);
|
|
|
|
extern void debug_dma_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t dma_addr, void *virt);
|
|
|
|
extern void debug_dma_free_coherent(struct device *dev, size_t size,
|
|
void *virt, dma_addr_t addr);
|
|
|
|
extern void debug_dma_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t dma_handle, size_t size,
|
|
int direction);
|
|
|
|
extern void debug_dma_sync_single_for_device(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
size_t size, int direction);
|
|
|
|
extern void debug_dma_sync_single_range_for_cpu(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
unsigned long offset,
|
|
size_t size,
|
|
int direction);
|
|
|
|
extern void debug_dma_sync_single_range_for_device(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
unsigned long offset,
|
|
size_t size, int direction);
|
|
|
|
extern void debug_dma_sync_sg_for_cpu(struct device *dev,
|
|
struct scatterlist *sg,
|
|
int nelems, int direction);
|
|
|
|
extern void debug_dma_sync_sg_for_device(struct device *dev,
|
|
struct scatterlist *sg,
|
|
int nelems, int direction);
|
|
|
|
extern void debug_dma_dump_mappings(struct device *dev);
|
|
|
|
extern void debug_dma_assert_idle(struct page *page);
|
|
|
|
#else /* CONFIG_DMA_API_DEBUG */
|
|
|
|
static inline void dma_debug_add_bus(struct bus_type *bus)
|
|
{
|
|
}
|
|
|
|
static inline void dma_debug_init(u32 num_entries)
|
|
{
|
|
}
|
|
|
|
static inline int dma_debug_resize_entries(u32 num_entries)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void debug_dma_map_page(struct device *dev, struct page *page,
|
|
size_t offset, size_t size,
|
|
int direction, dma_addr_t dma_addr,
|
|
bool map_single)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_mapping_error(struct device *dev,
|
|
dma_addr_t dma_addr)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
|
|
size_t size, int direction,
|
|
bool map_single)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
|
|
int nents, int mapped_ents, int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_unmap_sg(struct device *dev,
|
|
struct scatterlist *sglist,
|
|
int nelems, int dir)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t dma_addr, void *virt)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_free_coherent(struct device *dev, size_t size,
|
|
void *virt, dma_addr_t addr)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_sync_single_for_cpu(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
size_t size, int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_sync_single_for_device(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
size_t size, int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_sync_single_range_for_cpu(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
unsigned long offset,
|
|
size_t size,
|
|
int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_sync_single_range_for_device(struct device *dev,
|
|
dma_addr_t dma_handle,
|
|
unsigned long offset,
|
|
size_t size,
|
|
int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_sync_sg_for_cpu(struct device *dev,
|
|
struct scatterlist *sg,
|
|
int nelems, int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_sync_sg_for_device(struct device *dev,
|
|
struct scatterlist *sg,
|
|
int nelems, int direction)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_dump_mappings(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static inline void debug_dma_assert_idle(struct page *page)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DMA_API_DEBUG */
|
|
|
|
#endif /* __DMA_DEBUG_H */
|