Re: [PATCH v2 5/7] eal/linux: mmap ioports on ppc64

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

On Tue, May 17, 2016 at 05:54:01PM +0200, David Marchand wrote:
> > +pci_uio_ioport_map(struct rte_pci_device *dev, int bar,
> > +                  struct rte_pci_ioport *p)
> > +{
> > +       FILE *f;
> > +       char buf[BUFSIZ];
> > +       char filename[PATH_MAX];
> > +       uint64_t phys_addr, end_addr, flags;
> > +       int fd, i;
> > +       void *addr;
> > +
> > +       /* open and read addresses of the corresponding resource in sysfs */
> > +       snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource",
> > +               SYSFS_PCI_DEVICES, dev->addr.domain, dev->addr.bus,
> > +                dev->addr.devid, dev->addr.function);
> > +       f = fopen(filename, "r");
> > +       if (f == NULL) {
> > +               RTE_LOG(ERR, EAL, "Cannot open sysfs resource: %s\n",
> > +                       strerror(errno));
> > +               return -1;
> > +       }
> > +       for (i = 0; i < bar + 1; i++) {
> > +               if (fgets(buf, sizeof(buf), f) == NULL) {
> > +                       RTE_LOG(ERR, EAL, "Cannot read sysfs resource\n");
> > +                       goto error;
> > +               }
> > +       }
> > +       if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr,
> > +                       &end_addr, &flags) < 0)
> > +               goto error;
> > +       if ((flags & IORESOURCE_IO) == 0) {
> > +               RTE_LOG(ERR, EAL, "BAR %d is not an IO resource\n", bar);
> > +               goto error;
> > +       }
> > +       snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT "/resource%d",
> > +               SYSFS_PCI_DEVICES, dev->addr.domain, dev->addr.bus,
> > +                dev->addr.devid, dev->addr.function, bar);
> > +
> > +       /* mmap the pci resource */
> > +       fd = open(filename, O_RDWR);
> > +       if (fd < 0) {
> > +               RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", filename,
> > +                       strerror(errno));
> > +               goto error;
> > +       }
> > +       addr = mmap(NULL, end_addr + 1, PROT_READ | PROT_WRITE,
> > +               MAP_SHARED, fd, 0);
> 
> Sorry, did not catch it in v1, but a close(fd) is missing here.
> With this, I think the patchset looks good.
> 
> Just missing some opinion from the virtio maintainers ?

Apologize for being late for review. Assuming you have done proper
test, this patch set looks good to me. (well, I don't quite like
the tons of "#ifdef ... #else ..#end" block though)

A side note is that I noticed an ABI breakage introduced in this
patch, so, this release is not a good fit?

	--yliu