/* This function reads as much of the page as possible - it may return
a short read. If the page is invalid (e.g. the page could not be
mapped in or its not in a valid memory resource we null pad the
buffer and log to syslog.
*/
static ssize_t pmem_read_partial(struct file *file, char *buf, size_t count,
loff_t *poff) {
unsigned long page_offset = *poff % PAGE_SIZE;
unsigned long page_physaddr = *poff & PAGE_MASK;
size_t to_read = min(PAGE_SIZE - page_offset, count);
/* disable preemption to make sure we stay on the cpu where the page is
* remapped. If we don't do this we risk being preempted and scheduled on
* another cpu with an invalid mapping, returning wrong data. */
//pte_mmap->disable_interrupts_();
/* Manually remap the rogue page to the target offset */
if (pte_mmap->remap_page(pte_mmap, page_physaddr) !=
PTE_SUCCESS) {
DEBUG_LOG("Failed to remap rogue page to %#016lx", page_physaddr);
goto invalid_page;
}
/* Copy the data into the user buffer. */
if (_copy_to_user(
buf, (void *)((pte_mmap->rogue_page.value + page_offset)),
to_read)) {
DEBUG_LOG("Failed to copy page %#016llx to user space", *poff);
goto error_copy;
}
error_copy:
/* Increment the file offset. */
*poff += to_read;
//pte_mmap->enable_interrupts_();
return to_read;
invalid_page:
DEBUG_LOG("%016llx is invalid, zero padding...", *poff);
if (_copy_to_user(buf, (const void *)zero_page, to_read)) {
DEBUG_LOG("Failed to copy zero page for adress %#016llx to user "
"space.", *poff);
}
/* Increment the file offset. */
*poff += to_read;
//pte_mmap->enable_interrupts_();
return to_read;
};
int
ath_ioctl_ethtool(struct ath_softc *sc, int cmd, void *addr)
{
struct ethtool_drvinfo info = {0};
if (cmd != ETHTOOL_GDRVINFO)
return -EOPNOTSUPP;
info.cmd = cmd;
strncpy(info.driver, version, (sizeof(info.driver) - 1));
strncpy(info.version, dev_info, (sizeof(info.version) - 1));
return _copy_to_user(addr, &info, sizeof(info)) ? -EFAULT : 0;
}
