To save small bit of CPU time, hide part of SNTF register read latency
behind other reads.
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parent
7fc019af65
commit
aed39f0d65
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=196907
@ -891,16 +891,12 @@ ahci_phy_check_events(device_t dev)
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}
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static void
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ahci_notify_events(device_t dev)
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ahci_notify_events(device_t dev, u_int32_t status)
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{
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struct ahci_channel *ch = device_get_softc(dev);
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struct cam_path *dpath;
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u_int32_t status;
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int i;
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status = ATA_INL(ch->r_mem, AHCI_P_SNTF);
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if (status == 0)
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return;
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ATA_OUTL(ch->r_mem, AHCI_P_SNTF, status);
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if (bootverbose)
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device_printf(dev, "SNTF 0x%04x\n", status);
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@ -948,7 +944,7 @@ ahci_ch_intr(void *data)
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{
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device_t dev = (device_t)data;
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struct ahci_channel *ch = device_get_softc(dev);
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uint32_t istatus, cstatus, sstatus, ok, err;
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uint32_t istatus, sstatus, cstatus, sntf = 0, ok, err;
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enum ahci_err_type et;
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int i, ccs, ncq_err = 0;
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@ -958,8 +954,10 @@ ahci_ch_intr(void *data)
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return;
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ATA_OUTL(ch->r_mem, AHCI_P_IS, istatus);
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/* Read command statuses. */
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cstatus = ATA_INL(ch->r_mem, AHCI_P_CI);
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sstatus = ATA_INL(ch->r_mem, AHCI_P_SACT);
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cstatus = ATA_INL(ch->r_mem, AHCI_P_CI);
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if ((istatus & AHCI_P_IX_SDB) && (ch->caps & AHCI_CAP_SSNTF))
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sntf = ATA_INL(ch->r_mem, AHCI_P_SNTF);
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/* Process PHY events */
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if (istatus & (AHCI_P_IX_PRC | AHCI_P_IX_PC))
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ahci_phy_check_events(dev);
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@ -1023,8 +1021,8 @@ ahci_ch_intr(void *data)
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ahci_issue_read_log(dev);
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}
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/* Process NOTIFY events */
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if ((istatus & AHCI_P_IX_SDB) && (ch->caps & AHCI_CAP_SSNTF))
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ahci_notify_events(dev);
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if (sntf)
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ahci_notify_events(dev, sntf);
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}
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/* Must be called with channel locked. */
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