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Use r271207 optimization only for MSI-enabled HBAs.

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It was found that VirtualBox' AHCI does not allow nterrupt to be cleared
before the interrupt status register is read, causing interrupt storm.

AHCI specification allows to skip this register use when multi-vector MSI
is enabled and so interrupting port is known.  For single-vector MSI that
is not stated explicitly, but if the port is only one, it is obviously
known too.
This commit is contained in:
Alexander Motin 2014-10-06 10:58:54 +00:00
parent 9677c48e30
commit 88971a900d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=272606
1 changed files with 1 additions and 1 deletions
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2
sys/dev/ahci/ahci.c
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@ -360,7 +360,7 @@ ahci_setup_interrupt(device_t dev)
for (i = 0; i < ctlr->numirqs; i++) {
ctlr->irqs[i].ctlr = ctlr;
ctlr->irqs[i].r_irq_rid = i + (ctlr->msi ? 1 : 0);
if (ctlr->channels == 1 && !ctlr->ccc)
if (ctlr->channels == 1 && !ctlr->ccc && ctlr->msi)
ctlr->irqs[i].mode = AHCI_IRQ_MODE_ONE;
else if (ctlr->numirqs == 1 || i >= ctlr->channels ||
(ctlr->ccc && i == ctlr->cccv))