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pci: recognize "non-essential instrumentation" devices

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Some AMD EPYC VCPUs generated boot message of the type:

     pci4: <unknown> at device 0.0 (no driver attached)

These are displayed for device class 0x13 devices, e.g.:

none8@pci0:130:0:0:	class=0x130000 rev=0x00 hdr=0x00 vendor=0x1022 \
			device=0x148a subvendor=0x1022 subdevice=0x148a
    vendor     = 'Advanced Micro Devices, Inc. [AMD]'
    device     = 'Starship/Matisse PCIe Dummy Function'
    class      = non-essential instrumentation

Since these devices serve no purpose (no driver attaches) I have
enabled the reporting of suich devices only for verbose boots (a
diversion from the patch provided in the PR).

A verbose boot will now display such devices as:

  pci4: <non-essential instrumentation> at device 0.0 (no driver attached)

PR:		263469
Reported by:	jfc@mit.edu (John F. Carr)
MFC after:	1 week
This commit is contained in:
John F. Carr 2022-04-22 16:28:34 +02:00 committed by Stefan Eßer
parent 460ad988a9
commit f010b9c2b9
1 changed files with 1 additions and 0 deletions
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1
sys/dev/pci/pci.c
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@ -5030,6 +5030,7 @@ static const struct
{PCIC_DASP, PCIS_DASP_PERFCNTRS, 1, "performance counters"},
{PCIC_DASP, PCIS_DASP_COMM_SYNC, 1, "communication synchronizer"},
{PCIC_DASP, PCIS_DASP_MGMT_CARD, 1, "signal processing management"},
{PCIC_INSTRUMENT, -1, 0, "non-essential instrumentation"},
{0, 0, 0, NULL}
};