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Simplify the PCI bus dma tag code a bit. First, don't create a tag at

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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.
This commit is contained in:
John Baldwin 2012-03-07 18:50:33 +00:00
parent 7ad50a360b
commit 8766350924
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=232667
2 changed files with 15 additions and 8 deletions
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22
sys/dev/pci/pci.c
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@ -77,10 +77,12 @@ __FBSDID("$FreeBSD$");
* However, in the case of PAE, DMA addresses can cross a 4GB
* boundary, so as a workaround use a 2GB boundary.
*/
#if (BUS_SPACE_MAXADDR > 0xFFFFFFFF)
#ifdef PAE
#define PCI_DMA_BOUNDARY (1u << 31)
#define PCI_DMA_BOUNDARY 0x80000000
#else
#define PCI_DMA_BOUNDARY ((bus_size_t)((uint64_t)1 << 32))
#define PCI_DMA_BOUNDARY 0x100000000
#endif
#endif
#define PCIR_IS_BIOS(cfg, reg) \
@ -3232,7 +3234,10 @@ int
pci_attach_common(device_t dev)
{
struct pci_softc *sc;
int busno, domain, error;
int busno, domain;
#ifdef PCI_DMA_BOUNDARY
int error, tag_valid;
#endif
sc = device_get_softc(dev);
domain = pcib_get_domain(dev);
@ -3240,6 +3245,8 @@ pci_attach_common(device_t dev)
if (bootverbose)
device_printf(dev, "domain=%d, physical bus=%d\n",
domain, busno);
#ifdef PCI_DMA_BOUNDARY
tag_valid = 0;
if (device_get_devclass(device_get_parent(device_get_parent(dev))) !=
devclass_find("pci")) {
error = bus_dma_tag_create(bus_get_dma_tag(dev), 1,
@ -3250,8 +3257,11 @@ pci_attach_common(device_t dev)
device_printf(dev, "Failed to create DMA tag: %d\n",
error);
else
sc->sc_dma_tag_valid = 1;
tag_valid = 1;
}
if (!tag_valid)
#endif
sc->sc_dma_tag = bus_get_dma_tag(dev);
return (0);
}
@ -4363,9 +4373,7 @@ pci_get_dma_tag(device_t bus, device_t dev)
{
struct pci_softc *sc = device_get_softc(bus);
if (sc->sc_dma_tag_valid)
return (sc->sc_dma_tag);
return (bus_generic_get_dma_tag(bus, dev));
return (sc->sc_dma_tag);
}
uint32_t

1
sys/dev/pci/pci_private.h
View File

@ -40,7 +40,6 @@ DECLARE_CLASS(pci_driver);
struct pci_softc {
bus_dma_tag_t sc_dma_tag;
int sc_dma_tag_valid;
};
extern int pci_do_power_resume;