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Support accessing card via sysfs without driver loaded

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This commit is contained in:
Alex Forencich 2020-02-03 17:05:21 -08:00
parent c3eba353fb
commit 7977c3003b
1 changed files with 20 additions and 5 deletions
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25
utils/mqnic.c
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@ -38,10 +38,12 @@ either expressed or implied, of The Regents of the University of California.
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
struct mqnic *mqnic_open(const char *dev_name)
{
struct mqnic *dev = calloc(1, sizeof(struct mqnic));
struct stat st;
if (!dev)
{
@ -57,14 +59,26 @@ struct mqnic *mqnic_open(const char *dev_name)
goto fail_open;
}
struct mqnic_ioctl_info info;
if (ioctl(dev->fd, MQNIC_IOCTL_INFO, &info) != 0)
if (fstat(dev->fd, &st) == -1)
{
perror("MQNICCTL_INFO ioctl failed");
goto fail_ioctl;
perror("fstat failed");
goto fail_fstat;
}
dev->regs_size = st.st_size;
if (dev->regs_size == 0)
{
struct mqnic_ioctl_info info;
if (ioctl(dev->fd, MQNIC_IOCTL_INFO, &info) != 0)
{
perror("MQNIC_IOCTL_INFO ioctl failed");
goto fail_ioctl;
}
dev->regs_size = info.regs_size;
}
dev->regs_size = info.regs_size;
dev->regs = (volatile uint8_t *)mmap(NULL, dev->regs_size, PROT_READ | PROT_WRITE, MAP_SHARED, dev->fd, 0);
if (dev->regs == MAP_FAILED)
{
@ -179,6 +193,7 @@ fail_reset:
munmap((void *)dev->regs, dev->regs_size);
fail_mmap_regs:
fail_ioctl:
fail_fstat:
close(dev->fd);
fail_open:
free(dev);