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Enable PCI BAR reallocation by default.

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When pci_realloc_bars was first added, the intention was to eventually
enable it by default, but it was left disabled to preserve existing
behavior.  The setting is pretty conservative in that it does not
attempt to allocate resources for BARs that the BIOS/firmware leaves
disabled.  It only attempts to reallocate resources for a BAR that the
firmware programmed during boot but that conflicts with another
resource during the kernel's device scan.

PR 221350 is an example of a machine that this knob fixes.

Reviewed by:	imp
Differential Revision:	https://reviews.freebsd.org/D18965
This commit is contained in:
John Baldwin 2019-02-11 20:47:09 +00:00
parent 22427daf7e
commit 967b2dce02
1 changed files with 1 additions and 1 deletions
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2
sys/dev/pci/pci.c
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@ -341,7 +341,7 @@ SYSCTL_INT(_hw_pci, OID_AUTO, enable_io_modes, CTLFLAG_RWTUN,
" enable these bits correctly. We'd like to do this all the time, but"
" there are some peripherals that this causes problems with.");
static int pci_do_realloc_bars = 0;
static int pci_do_realloc_bars = 1;
SYSCTL_INT(_hw_pci, OID_AUTO, realloc_bars, CTLFLAG_RWTUN,
&pci_do_realloc_bars, 0,
"Attempt to allocate a new range for any BARs whose original "