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Save one register read (AHCI_IS) for AHCI controllers with only one port.

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For controllers with only one port (like PCIe or M.2 SSDs) interrupt can
come from only one source, and skipping read saves few percents of CPU time.

MFC after:	1 month
H/W donated by:	I/O Switch
This commit is contained in:
Alexander Motin 2014-09-06 19:43:48 +00:00
parent f3f509767a
commit c45ff92177
1 changed files with 3 additions and 1 deletions
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4
sys/dev/ahci/ahci.c
View file

@ -359,7 +359,9 @@ 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->numirqs == 1 || i >= ctlr->channels ||
if (ctlr->channels == 1 && !ctlr->ccc)
ctlr->irqs[i].mode = AHCI_IRQ_MODE_ONE;
else if (ctlr->numirqs == 1 || i >= ctlr->channels ||
(ctlr->ccc && i == ctlr->cccv))
ctlr->irqs[i].mode = AHCI_IRQ_MODE_ALL;
else if (i == ctlr->numirqs - 1)