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System call delegation supports DMA alignment

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This commit is contained in:
Taku Shimosawa
2012-02-24 18:08:05 +09:00
parent dad780a133
commit a63b4a7369
7 changed files with 124 additions and 20 deletions
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46
linux/mod_mcctrl/syscall.c
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@ -9,11 +9,28 @@
#include <asm/delay.h>
#include "mcctrl.h"
#define ALIGN_WAIT_BUF(z) (((z + 63) >> 6) << 6)
#define SC_DEBUG
#ifdef SC_DEBUG
static struct aal_dma_request last_request;
static void print_dma_lastreq(void)
{
printk("SRC OS : %p | %lx\nDESTOS : %p | %lx\n", last_request.src_os,
last_request.src_phys, last_request.dest_os,
last_request.dest_phys);
printk("SIZE : %lx | NOTIFY : %p | PRIV : %p\n",
last_request.size, last_request.notify, last_request.priv);
}
#endif
static int do_async_copy(aal_os_t os, unsigned long dest, unsigned long src,
unsigned long size, unsigned int inbound)
{
struct aal_dma_request request;
aal_dma_channel_t channel;
unsigned long asize = ALIGN_WAIT_BUF(size);
channel = aal_device_get_dma_channel(aal_os_to_dev(os), 0);
if (!channel) {
@ -21,28 +38,48 @@ static int do_async_copy(aal_os_t os, unsigned long dest, unsigned long src,
}
memset(&request, 0, sizeof(request));
request.src_os = os;
request.src_os = inbound ? os : NULL;
request.src_phys = src;
request.dest_os = NULL;
request.dest_os = inbound ? NULL : os;
request.dest_phys = dest;
request.size = size;
request.notify = (void *)(inbound ? dest + size : src + size);
request.notify = (void *)(inbound ? dest + asize : src + asize);
request.priv = (void *)1;
*(unsigned long *)phys_to_virt((unsigned long)request.notify) = 0;
#ifdef SC_DEBUG
last_request = request;
#endif
aal_dma_request(channel, &request);
return 0;
}
int mcctrl_dma_abort;
static void async_wait(unsigned char *p, int size)
{
while (!p[size]) {
int asize = ALIGN_WAIT_BUF(size);
unsigned long long s, w;
rdtscll(s);
while (!p[asize]) {
mb();
cpu_relax();
rdtscll(w);
if (w > s + 1024UL * 1024 * 1024 * 10) {
printk("DMA Timed out : %p (%p + %d) => %d\n",
p + asize, p, size, p[asize]);
print_dma_lastreq();
mcctrl_dma_abort = 1;
return;
}
}
}
static void clear_wait(unsigned char *p, int size)
{
int asize = ALIGN_WAIT_BUF(size);
p[size] = 0;
}
@ -75,7 +112,6 @@ static unsigned long translate_remote_va(struct mcctrl_channel *c,
return -EFAULT;
}
unsigned long last_thread_exec = 0;
extern struct mcctrl_channel *channels;