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kfifo: add kfifo_dma_out_prepare_mapped()

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When the kfifo buffer is already dma-mapped, one cannot use the kfifo
API to fill in an SG list.

Add kfifo_dma_in_prepare_mapped() which allows exactly this. A mapped
dma_addr_t is passed and it is filled into provided sgl too. Including
the dma_len.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20240405060826.2521-8-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE)
2024-04-05 08:08:18 +02:00
committed by Greg Kroah-Hartman
parent fea0dde081
commit d52b761e4b
2 changed files with 47 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
lib/kfifo.c
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@@ -6,6 +6,7 @@
*/
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/err.h>
@@ -307,7 +308,7 @@ EXPORT_SYMBOL(__kfifo_to_user);
static unsigned int setup_sgl_buf(struct __kfifo *fifo, struct scatterlist *sgl,
unsigned int data_offset, int nents,
unsigned int len)
unsigned int len, dma_addr_t dma)
{
const void *buf = fifo->data + data_offset;
@@ -316,11 +317,16 @@ static unsigned int setup_sgl_buf(struct __kfifo *fifo, struct scatterlist *sgl,
sg_set_buf(sgl, buf, len);
if (dma != DMA_MAPPING_ERROR) {
sg_dma_address(sgl) = dma + data_offset;
sg_dma_len(sgl) = len;
}
return 1;
}
static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
int nents, unsigned int len, unsigned int off)
int nents, unsigned int len, unsigned int off, dma_addr_t dma)
{
unsigned int size = fifo->mask + 1;
unsigned int esize = fifo->esize;
@@ -335,14 +341,15 @@ static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
}
len_to_end = min(len, size - off);
n = setup_sgl_buf(fifo, sgl, off, nents, len_to_end);
n += setup_sgl_buf(fifo, sgl + n, 0, nents - n, len - len_to_end);
n = setup_sgl_buf(fifo, sgl, off, nents, len_to_end, dma);
n += setup_sgl_buf(fifo, sgl + n, 0, nents - n, len - len_to_end, dma);
return n;
}
unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,
struct scatterlist *sgl, int nents, unsigned int len)
struct scatterlist *sgl, int nents, unsigned int len,
dma_addr_t dma)
{
unsigned int l;
@@ -350,12 +357,13 @@ unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,
if (len > l)
len = l;
return setup_sgl(fifo, sgl, nents, len, fifo->in);
return setup_sgl(fifo, sgl, nents, len, fifo->in, dma);
}
EXPORT_SYMBOL(__kfifo_dma_in_prepare);
unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,
struct scatterlist *sgl, int nents, unsigned int len)
struct scatterlist *sgl, int nents, unsigned int len,
dma_addr_t dma)
{
unsigned int l;
@@ -363,7 +371,7 @@ unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,
if (len > l)
len = l;
return setup_sgl(fifo, sgl, nents, len, fifo->out);
return setup_sgl(fifo, sgl, nents, len, fifo->out, dma);
}
EXPORT_SYMBOL(__kfifo_dma_out_prepare);
@@ -547,7 +555,8 @@ int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to,
EXPORT_SYMBOL(__kfifo_to_user_r);
unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
struct scatterlist *sgl, int nents, unsigned int len, size_t recsize,
dma_addr_t dma)
{
BUG_ON(!nents);
@@ -556,7 +565,7 @@ unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
if (len + recsize > kfifo_unused(fifo))
return 0;
return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize);
return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize, dma);
}
EXPORT_SYMBOL(__kfifo_dma_in_prepare_r);
@@ -570,7 +579,8 @@ void __kfifo_dma_in_finish_r(struct __kfifo *fifo,
EXPORT_SYMBOL(__kfifo_dma_in_finish_r);
unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
struct scatterlist *sgl, int nents, unsigned int len, size_t recsize,
dma_addr_t dma)
{
BUG_ON(!nents);
@@ -579,7 +589,7 @@ unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
if (len + recsize > fifo->in - fifo->out)
return 0;
return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize);
return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize, dma);
}
EXPORT_SYMBOL(__kfifo_dma_out_prepare_r);