Simplify the PCI bus dma tag code a bit. First, don't create a tag at
all for platforms that only have 32-bit bus addresses. Second, remove the 'tag_valid' flag from the softc. Instead, if we don't create a tag in pci_attach_common(), just cache the value of our parent's tag so that we always have a valid tag to return.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=232667
@ -77,10 +77,12 @@ __FBSDID("$FreeBSD$");
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* However, in the case of PAE, DMA addresses can cross a 4GB
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* boundary, so as a workaround use a 2GB boundary.
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*/
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#if (BUS_SPACE_MAXADDR > 0xFFFFFFFF)
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#ifdef PAE
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#define PCI_DMA_BOUNDARY (1u << 31)
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#define PCI_DMA_BOUNDARY 0x80000000
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#else
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#define PCI_DMA_BOUNDARY ((bus_size_t)((uint64_t)1 << 32))
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#define PCI_DMA_BOUNDARY 0x100000000
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#endif
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#endif
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#define PCIR_IS_BIOS(cfg, reg) \
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@ -3232,7 +3234,10 @@ int
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pci_attach_common(device_t dev)
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{
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struct pci_softc *sc;
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int busno, domain, error;
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int busno, domain;
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#ifdef PCI_DMA_BOUNDARY
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int error, tag_valid;
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#endif
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sc = device_get_softc(dev);
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domain = pcib_get_domain(dev);
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@ -3240,6 +3245,8 @@ pci_attach_common(device_t dev)
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if (bootverbose)
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device_printf(dev, "domain=%d, physical bus=%d\n",
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domain, busno);
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#ifdef PCI_DMA_BOUNDARY
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tag_valid = 0;
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if (device_get_devclass(device_get_parent(device_get_parent(dev))) !=
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devclass_find("pci")) {
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error = bus_dma_tag_create(bus_get_dma_tag(dev), 1,
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@ -3250,8 +3257,11 @@ pci_attach_common(device_t dev)
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device_printf(dev, "Failed to create DMA tag: %d\n",
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error);
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else
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sc->sc_dma_tag_valid = 1;
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tag_valid = 1;
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}
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if (!tag_valid)
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#endif
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sc->sc_dma_tag = bus_get_dma_tag(dev);
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return (0);
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}
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@ -4363,9 +4373,7 @@ pci_get_dma_tag(device_t bus, device_t dev)
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{
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struct pci_softc *sc = device_get_softc(bus);
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if (sc->sc_dma_tag_valid)
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return (sc->sc_dma_tag);
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return (bus_generic_get_dma_tag(bus, dev));
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}
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uint32_t
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@ -40,7 +40,6 @@ DECLARE_CLASS(pci_driver);
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struct pci_softc {
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bus_dma_tag_t sc_dma_tag;
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int sc_dma_tag_valid;
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};
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extern int pci_do_power_resume;
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