[dpdk-dev] [PATCH] pci/uio: enable prefetchable resources mapping
Changpeng Liu
changpeng.liu at intel.com
Thu Feb 1 02:18:22 CET 2018
For PCI prefetchable resources, Linux will create a
write combined file as well, the library will try
to map resourceX_wc file first, if the file does
not exist, then it will map resourceX as usual.
Signed-off-by: Changpeng Liu <changpeng.liu at intel.com>
---
drivers/bus/pci/linux/pci_uio.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/bus/pci/linux/pci_uio.c b/drivers/bus/pci/linux/pci_uio.c
index d423e4b..2957a5f 100644
--- a/drivers/bus/pci/linux/pci_uio.c
+++ b/drivers/bus/pci/linux/pci_uio.c
@@ -293,7 +293,7 @@
/* update devname for mmap */
snprintf(devname, sizeof(devname),
- "%s/" PCI_PRI_FMT "/resource%d",
+ "%s/" PCI_PRI_FMT "/resource%d_wc",
rte_pci_get_sysfs_path(),
loc->domain, loc->bus, loc->devid,
loc->function, res_idx);
@@ -307,13 +307,22 @@
}
/*
- * open resource file, to mmap it
+ * open prefetchable resource file first, try to mmap it
*/
fd = open(devname, O_RDWR);
if (fd < 0) {
- RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
- devname, strerror(errno));
- goto error;
+ snprintf(devname, sizeof(devname),
+ "%s/" PCI_PRI_FMT "/resource%d",
+ rte_pci_get_sysfs_path(),
+ loc->domain, loc->bus, loc->devid,
+ loc->function, res_idx);
+ /* then try to map resource file */
+ fd = open(devname, O_RDWR);
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
+ devname, strerror(errno));
+ goto error;
+ }
}
/* try mapping somewhere close to the end of hugepages */
--
1.9.3
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