ahci: Check if bus is cache-coherent
We do this for FDT systems but not for ACPI ones. Check the presence of the _CCA attribute. Sponsored by: Ampere Computing, LLC Reviewed by: andrew Differential Revision: https://reviews.freebsd.org/D20144
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=347440
@ -89,6 +89,7 @@ ahci_fdt_probe(device_t dev)
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static int
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ahci_acpi_probe(device_t dev)
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{
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struct ahci_controller *ctlr = device_get_softc(dev);
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ACPI_HANDLE h;
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if ((h = acpi_get_handle(dev)) == NULL)
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@ -98,6 +99,12 @@ ahci_acpi_probe(device_t dev)
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pci_get_subclass(dev) == PCIS_STORAGE_SATA &&
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pci_get_progif(dev) == PCIP_STORAGE_SATA_AHCI_1_0) {
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device_set_desc_copy(dev, "AHCI SATA controller");
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if (ACPI_FAILURE(acpi_GetInteger(h, "_CCA",
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&ctlr->dma_coherent)))
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ctlr->dma_coherent = 0;
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if (bootverbose)
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device_printf(dev, "Bus is%s cache-coherent\n",
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ctlr->dma_coherent ? "" : " not");
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return (BUS_PROBE_DEFAULT);
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}
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