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DM: reset each ptdev before assignment 

This helps achieving valid dev state after UOS restart

Signed-off-by: Edwin Zhai <edwin.zhai@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Edwin Zhai 2018-06-22 14:23:22 +08:00 committed by lijinxia
parent b8384ea0dd
commit dafca1743d
1 changed files with 23 additions and 18 deletions
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25
devicemodel/hw/pci/passthrough.c
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@ -37,6 +37,8 @@
#include <errno.h>
#include <pthread.h>
#include <pciaccess.h>
#include <fcntl.h>
#include <unistd.h>
#include "iodev.h"
#include "vmmapi.h"
@ -815,7 +817,7 @@ cfginit(struct vmctx *ctx, struct passthru_dev *ptdev, int bus,
{
int irq_type = IRQ_MSI;
char reset_path[60];
FILE *f;
int fd;
bzero(&ptdev->sel, sizeof(struct pcisel));
ptdev->sel.bus = bus;
@ -835,26 +837,29 @@ cfginit(struct vmctx *ctx, struct passthru_dev *ptdev, int bus,
irq_type = IRQ_INTX;
}
/* Check reset method for PCIe dev. If SOS kernel provides 'reset'
* entry in sysfs, related dev has some reset capability, e.g. FLR, or
* secondary bus reset. PCIe dev without any reset capability is
* refused for passthrough.
/* If SOS kernel provides 'reset' entry in sysfs, related dev has some
* reset capability, e.g. FLR, or secondary bus reset. We do 2 things:
* - reset each dev before passthrough to achieve valid dev state after
* UOS reboot
* - refuse to passthrough PCIe dev without any reset capability
*/
if (ptdev->pcie_cap) {
snprintf(reset_path, 40,
"/sys/bus/pci/devices/0000:%02x:%02x.%x/reset",
bus, slot, func);
if ((f = fopen(reset_path, "r")))
fclose(f);
else if (errno == ENOENT) {
fd = open(reset_path, O_WRONLY);
if (fd >= 0) {
if (write(fd, "1", 1) < 0)
warnx("reset dev %x/%x/%x failed!\n",
bus, slot, func);
close(fd);
} else if (errno == ENOENT && ptdev->pcie_cap) {
warnx("No reset capability for PCIe %x/%x/%x, "
"remove it from ptdev list!!\n",
bus, slot, func);
if (!no_reset)
return -1;
}
}
if (cfginitbar(ctx, ptdev) != 0) {
warnx("failed to initialize BARs for PCI %x/%x/%x",