From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: dev@dpdk.org, Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: [dpdk-dev] [PATCH v4] igb_uio: fix possible mmap failure for Linux >= v4.5
Date: Sun, 10 Jul 2016 15:58:19 +0200 [thread overview]
Message-ID: <3923466.ri2s8GbSSX@xps13> (raw)
In-Reply-To: <1467730852-12040-1-git-send-email-ferruh.yigit@intel.com>
2016-07-05 16:00, Ferruh Yigit:
> 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: af75078fece3 ("first public release")
>
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Applied, thanks
I suggested to apply it in RC3 but we have no comments.
That's why it is part of RC2.
next prev parent reply other threads:[~2016-07-10 13:58 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-01 10:21 [dpdk-dev] Issue with igb_uio in Fedora 24 Mcnamara, John
2016-07-01 10:53 ` Ferruh Yigit
2016-07-01 11:35 ` [dpdk-dev] [PATCH] igb_uio: fix mmap failure Ferruh Yigit
2016-07-01 12:47 ` Thomas Monjalon
2016-07-01 14:39 ` Ferruh Yigit
2016-07-01 14:54 ` Thomas Monjalon
2016-07-01 15:07 ` [dpdk-dev] [PATCH v2] igb_uio: fix possible mmap failure for Linux > v4.3 Ferruh Yigit
2016-07-01 15:52 ` De Lara Guarch, Pablo
2016-07-01 15:54 ` Ferruh Yigit
2016-07-01 15:59 ` [dpdk-dev] [PATCH v3] igb_uio: fix possible mmap failure for Linux >= v4.5 Ferruh Yigit
2016-07-05 15:00 ` [dpdk-dev] [PATCH v4] " Ferruh Yigit
2016-07-10 13:58 ` Thomas Monjalon [this message]
2016-07-02 0:12 ` [dpdk-dev] Issue with igb_uio in Fedora 24 De Lara Guarch, Pablo
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