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LinuxKPI: implement dma_sync_single_for_*, apply to (un)map single/sg

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Implement dma_sync_single_for_{cpu,device} translating the Linux
DMA_ flags to BUS_DMASYNC_ combinations.  Make map_single/unmap_single*
functions call the respective sync function.   Apply the same logic to
the scatter-gather list map/unmap functions.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Reviewed by:	hselasky
Differential Revision: https://reviews.freebsd.org/D32255
This commit is contained in:
Bjoern A. Zeeb 2021-10-01 10:51:50 +00:00
parent 7d3fc84b2d
commit 95edb10b47
2 changed files with 124 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
sys/compat/linuxkpi/common/include/linux/dma-mapping.h
View File

@ -103,6 +103,7 @@ int linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
void linux_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents __unused, enum dma_data_direction dir __unused,
unsigned long attrs __unused);
void linuxkpi_dma_sync(struct device *, dma_addr_t, size_t, bus_dmasync_op_t);
static inline int
dma_supported(struct device *dev, u64 dma_mask)
@ -167,12 +168,6 @@ dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
kmem_free((vm_offset_t)cpu_addr, size);
}
#define dma_map_single_attrs(dev, ptr, size, dir, attrs) \
linux_dma_map_phys(dev, vtophys(ptr), size)
#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
linux_dma_unmap(dev, dma_addr, size)
static inline dma_addr_t
dma_map_page_attrs(struct device *dev, struct page *page, size_t offset,
size_t size, enum dma_data_direction dir, unsigned long attrs)
@ -205,9 +200,28 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
}
static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma, size_t size,
enum dma_data_direction direction)
{
bus_dmasync_op_t op;
switch (direction) {
case DMA_BIDIRECTIONAL:
op = BUS_DMASYNC_POSTREAD;
linuxkpi_dma_sync(dev, dma, size, op);
op = BUS_DMASYNC_PREREAD;
break;
case DMA_TO_DEVICE:
op = BUS_DMASYNC_POSTWRITE;
break;
case DMA_FROM_DEVICE:
op = BUS_DMASYNC_POSTREAD;
break;
default:
return;
}
linuxkpi_dma_sync(dev, dma, size, op);
}
static inline void
@ -218,9 +232,26 @@ dma_sync_single(struct device *dev, dma_addr_t addr, size_t size,
}
static inline void
dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
dma_sync_single_for_device(struct device *dev, dma_addr_t dma,
size_t size, enum dma_data_direction direction)
{
bus_dmasync_op_t op;
switch (direction) {
case DMA_BIDIRECTIONAL:
op = BUS_DMASYNC_PREWRITE;
break;
case DMA_TO_DEVICE:
op = BUS_DMASYNC_PREREAD;
break;
case DMA_FROM_DEVICE:
op = BUS_DMASYNC_PREWRITE;
break;
default:
return;
}
linuxkpi_dma_sync(dev, dma, size, op);
}
static inline void
@ -260,6 +291,34 @@ static inline unsigned int dma_set_max_seg_size(struct device *dev,
return (0);
}
static inline dma_addr_t
_dma_map_single_attrs(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction, unsigned long attrs __unused)
{
dma_addr_t dma;
dma = linux_dma_map_phys(dev, vtophys(ptr), size);
if (!dma_mapping_error(dev, dma))
dma_sync_single_for_device(dev, dma, size, direction);
return (dma);
}
static inline void
_dma_unmap_single_attrs(struct device *dev, dma_addr_t dma, size_t size,
enum dma_data_direction direction, unsigned long attrs __unused)
{
dma_sync_single_for_cpu(dev, dma, size, direction);
linux_dma_unmap(dev, dma, size);
}
#define dma_map_single_attrs(dev, ptr, size, dir, attrs) \
_dma_map_single_attrs(dev, ptr, size, dir, 0)
#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
_dma_unmap_single_attrs(dev, dma_addr, size, dir, 0)
#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)

60
sys/compat/linuxkpi/common/src/linux_pci.c
View File

@ -1,7 +1,7 @@
/*-
* Copyright (c) 2015-2016 Mellanox Technologies, Ltd.
* All rights reserved.
* Copyright (c) 2020-2021 The FreeBSD Foundation
* Copyright (c) 2020-2022 The FreeBSD Foundation
*
* Portions of this software were developed by Björn Zeeb
* under sponsorship from the FreeBSD Foundation.
@ -957,9 +957,32 @@ linux_dma_alloc_coherent(struct device *dev, size_t size,
return (mem);
}
void
linuxkpi_dma_sync(struct device *dev, dma_addr_t dma_addr, size_t size,
bus_dmasync_op_t op)
{
struct linux_dma_priv *priv;
struct linux_dma_obj *obj;
priv = dev->dma_priv;
if (pctrie_is_empty(&priv->ptree))
return;
DMA_PRIV_LOCK(priv);
obj = LINUX_DMA_PCTRIE_LOOKUP(&priv->ptree, dma_addr);
if (obj == NULL) {
DMA_PRIV_UNLOCK(priv);
return;
}
bus_dmamap_sync(obj->dmat, obj->dmamap, op);
DMA_PRIV_UNLOCK(priv);
}
int
linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir __unused, unsigned long attrs __unused)
enum dma_data_direction direction, unsigned long attrs __unused)
{
struct linux_dma_priv *priv;
struct scatterlist *sg;
@ -992,6 +1015,21 @@ linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents,
sg_dma_address(sg) = seg.ds_addr;
}
switch (direction) {
case DMA_BIDIRECTIONAL:
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_PREWRITE);
break;
case DMA_TO_DEVICE:
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_PREREAD);
break;
case DMA_FROM_DEVICE:
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_PREWRITE);
break;
default:
break;
}
DMA_PRIV_UNLOCK(priv);
return (nents);
@ -999,7 +1037,7 @@ linux_dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nents,
void
linux_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
int nents __unused, enum dma_data_direction dir __unused,
int nents __unused, enum dma_data_direction direction,
unsigned long attrs __unused)
{
struct linux_dma_priv *priv;
@ -1007,6 +1045,22 @@ linux_dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sgl,
priv = dev->dma_priv;
DMA_PRIV_LOCK(priv);
switch (direction) {
case DMA_BIDIRECTIONAL:
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_POSTREAD);
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_PREREAD);
break;
case DMA_TO_DEVICE:
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_POSTWRITE);
break;
case DMA_FROM_DEVICE:
bus_dmamap_sync(priv->dmat, sgl->dma_map, BUS_DMASYNC_POSTREAD);
break;
default:
break;
}
bus_dmamap_unload(priv->dmat, sgl->dma_map);
bus_dmamap_destroy(priv->dmat, sgl->dma_map);
DMA_PRIV_UNLOCK(priv);