On Saturday, April 02, 2016 11:49:53 AM Oliver Pinter wrote:
> > + if (cap & PCIEM_SLOT_CAP_HPS)
> > + printf(" surprise");
>
>
> What is this surprise string or state? Or is this a forgotten debug string?
It's an actual thing in the spec. "Surprise" insertion/removal means that
devices
can be hotplugged without requiring notification to the OS ahead of time. The
expresscard slots in my x220 actually report this:
pcib3@pci0:0:28:3: class=0x060400 card=0x21da17aa chip=0x1c168086 rev=0xb4
hdr=0x01
cap 10[40] = PCI-Express 2 root port max data 128(128)
link x0(x1) speed 0.0(5.0) ASPM L0s/L1(L0s/L1)
slot 3 power limit 100 mW HotPlug(empty) surprise
cap 05[80] = MSI supports 1 message
cap 0d[90] = PCI Bridge card=0x21da17aa
cap 01[a0] = powerspec 2 supports D0 D3 current D0
and after inserting a card:
pcib3@pci0:0:28:3: class=0x060400 card=0x21da17aa chip=0x1c168086 rev=0xb4
hdr=0x01
cap 10[40] = PCI-Express 2 root port max data 128(128)
link x1(x1) speed 2.5(5.0) ASPM disabled(L0s/L1)
slot 3 power limit 100 mW HotPlug(present) surprise
cap 05[80] = MSI supports 1 message
cap 0d[90] = PCI Bridge card=0x21da17aa
cap 01[a0] = powerspec 2 supports D0 D3 current D0
--
John Baldwin
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