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Code Issues Releases Wiki Activity

added DMA memory managment functions

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This commit is contained in:
Steffen Vogel 2016-07-08 12:59:09 +02:00
parent eb7391a4a3
commit ac389a76ff
2 changed files with 73 additions and 6 deletions
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24
include/villas/fpga/dma.h
View file

@ -18,20 +18,32 @@
#include <xilinx/xaxidma.h>
#define FPGA_DMA_BASEADDR 0x00000000
#define FPGA_DMA_BOUNDARY 0x1000
#define FPGA_DMA_BD_OFFSET 0xC0000000
#define FPGA_DMA_BD_SIZE (32 << 20) // 32 MB
#define XAXIDMA_SR_SGINCL_MASK 0x00000008
struct dma {
XAxiDma inst;
};
struct dma_mem {
uint32_t base_virt;
uint32_t base_phys;
char *base_virt;
char *base_phys;
size_t len;
};
struct dma {
XAxiDma inst;
struct dma_mem bd;
};
struct ip;
int dma_mem_split(struct dma_mem *o, struct dma_mem *a, struct dma_mem *b);
int dma_alloc(struct ip *c, struct dma_mem *mem, size_t len, int flags);
int dma_free(struct ip *c, struct dma_mem *mem);
int dma_write(struct ip *c, char *buf, size_t len);
int dma_read(struct ip *c, char *buf, size_t len);
int dma_read_complete(struct ip *c, char **buf, size_t *len);

55
lib/fpga/dma.c
View file

@ -11,6 +11,7 @@
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/mman.h>
#include <villas/log.h>
@ -18,6 +19,60 @@
#include "fpga/dma.h"
#include "fpga/ip.h"
int dma_mem_split(struct dma_mem *o, struct dma_mem *a, struct dma_mem *b)
{
int split = o->len / 2;
a->base_virt = o->base_virt;
a->base_phys = o->base_phys;
b->base_virt = a->base_virt + split;
b->base_phys = a->base_phys + split;
a->len = split;
b->len = o->len - split;
return 0;
}
int dma_alloc(struct ip *c, struct dma_mem *mem, size_t len, int flags)
{
int ret;
/* Align to next bigger page size chunk */
if (len & 0xFFF) {
len += 0x1000;
len &= ~0xFFF;
}
mem->len = len;
mem->base_phys = -1; /* find free */
mem->base_virt = mmap(0, mem->len, PROT_READ | PROT_WRITE, flags | MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, 0, 0);
if (mem->base_virt == MAP_FAILED)
return -1;
ret = vfio_map_dma(c->card->vd.group->container, mem);
if (ret)
return -2;
return 0;
}
int dma_free(struct ip *c, struct dma_mem *mem)
{
int ret;
ret = vfio_unmap_dma(c->card->vd.group->container, mem);
if (ret)
return ret;
ret = munmap(mem->base_virt, mem->len);
if (ret)
return ret;
return 0;
}
int dma_ping_pong(struct ip *c, char *src, char *dst, size_t len)
{
int ret;