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pciconf: Use VM_MEMATTR_DEVICE on supported architectures

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Some architectures - armv7, armv8 and riscv use VM_MEMATTR_DEVICE
when mapping device registers in kernel. Do the same in pciconf.
On armada8k SoC all reads from BARs mapped with hitherto attribute
(VM_MEMATTR_UNCACHEABLE) return 0xff's.

Submitted by: Kornel Duleba <mindal@semihalf.com>
Reviewed by: kib
Obtained from: Semihalf
Sponsored by: Marvell
Differential revision: https://reviews.freebsd.org/D29603

(cherry picked from commit 1c1ead9b94)
This commit is contained in:
Marcin Wojtas 2021-04-06 17:00:05 +02:00 committed by Andrew Turner
parent b0c251b0de
commit 2a8921c5d1
1 changed files with 5 additions and 1 deletions
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6
usr.sbin/pciconf/pciconf.c
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@ -1126,7 +1126,11 @@ dump_bar(const char *name, const char *reg, const char *bar_start,
if (*reg == '\0' || *el != '\0')
errx(1, "Invalid bar specification %s", reg);
pbm.pbm_flags = 0;
pbm.pbm_memattr = VM_MEMATTR_UNCACHEABLE; /* XXX */
#ifdef VM_MEMATTR_DEVICE
pbm.pbm_memattr = VM_MEMATTR_DEVICE;
#else
pbm.pbm_memattr = VM_MEMATTR_UNCACHEABLE;
#endif
fd = open(_PATH_DEVPCI, O_RDWR, 0);
if (fd < 0)