numam-dpdk/doc
Ferruh Yigit d05aafe62f igb_uio: fix possible mmap failure with Linux 4.5
mmap the iomem range of the PCI device fails for kernels that
enabled CONFIG_IO_STRICT_DEVMEM option:

EAL: pci_map_resource():
         cannot mmap(39, 0x7f1c51800000, 0x100000, 0x0):
         Invalid argument (0xffffffffffffffff)

CONFIG_IO_STRICT_DEVMEM is introduced in Linux v4.5 and not enabled
by default:
Linux commit: 90a545e restrict /dev/mem to idle io memory ranges

As a workaround igb_uio can stop reserving PCI memory resources, from
kernel point of view iomem region looks like idle and mmap works
again. This matches uio_pci_generic usage.

With this update device iomem range is not protected against any
other kernel drivers or userspace access. But this  shouldn't
be a problem for dpdk usage module since purpose of the igb_uio
module is to provide userspace access.

Fixes: af75078fec ("first public release")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
2016-07-10 15:56:54 +02:00
..
api port: support KNI 2016-06-21 18:05:45 +02:00
guides igb_uio: fix possible mmap failure with Linux 4.5 2016-07-10 15:56:54 +02:00
logo doc: change theme of guides 2015-12-13 22:30:47 +01:00
build-sdk-quick.txt mk: stop on warning only in developer build 2016-03-03 11:33:14 +01:00