Date: Fri, 2 Mar 2012 20:38:05 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r232403 - in head/sys: dev/acpica dev/cardbus dev/pci powerpc/ofw sparc64/pci Message-ID: <201203022038.q22Kc5vd046376@svn.freebsd.org>
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Author: jhb Date: Fri Mar 2 20:38:04 2012 New Revision: 232403 URL: http://svn.freebsd.org/changeset/base/232403 Log: - Add a bus_dma tag to each PCI bus that is a child of a Host-PCI bridge. The tag enforces a single restriction that all DMA transactions must not cross a 4GB boundary. Note that while this restriction technically only applies to PCI-express, this change applies it to all PCI devices as it is simpler to implement that way and errs on the side of caution. - Add a softc structure for PCI bus devices to hold the bus_dma tag and a new pci_attach_common() routine that performs actions common to the attach phase of all PCI bus drivers. Right now this only consists of a bootverbose printf and the allocate of a bus_dma tag if necessary. - Adjust all PCI bus drivers to allocate a PCI bus softc and to call pci_attach_common() from their attach routines. MFC after: 2 weeks Modified: head/sys/dev/acpica/acpi_pci.c head/sys/dev/cardbus/cardbus.c head/sys/dev/pci/pci.c head/sys/dev/pci/pci_private.h head/sys/powerpc/ofw/ofw_pcibus.c head/sys/sparc64/pci/ofw_pcibus.c Modified: head/sys/dev/acpica/acpi_pci.c ============================================================================== --- head/sys/dev/acpica/acpi_pci.c Fri Mar 2 20:34:15 2012 (r232402) +++ head/sys/dev/acpica/acpi_pci.c Fri Mar 2 20:38:04 2012 (r232403) @@ -99,7 +99,8 @@ static device_method_t acpi_pci_methods[ static devclass_t pci_devclass; -DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, 0, pci_driver); +DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, sizeof(struct pci_softc), + pci_driver); DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0); MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1); MODULE_DEPEND(acpi_pci, pci, 1, 1, 1); @@ -276,7 +277,11 @@ acpi_pci_probe(device_t dev) static int acpi_pci_attach(device_t dev) { - int busno, domain; + int busno, domain, error; + + error = pci_attach_common(dev); + if (error) + return (error); /* * Since there can be multiple independantly numbered PCI @@ -286,9 +291,6 @@ acpi_pci_attach(device_t dev) */ domain = pcib_get_domain(dev); busno = pcib_get_bus(dev); - if (bootverbose) - device_printf(dev, "domain=%d, physical bus=%d\n", - domain, busno); /* * First, PCI devices are added as in the normal PCI bus driver. Modified: head/sys/dev/cardbus/cardbus.c ============================================================================== --- head/sys/dev/cardbus/cardbus.c Fri Mar 2 20:34:15 2012 (r232402) +++ head/sys/dev/cardbus/cardbus.c Fri Mar 2 20:38:04 2012 (r232403) @@ -316,6 +316,7 @@ static device_method_t cardbus_methods[] DEVMETHOD(device_resume, cardbus_resume), /* Bus interface */ + DEVMETHOD(bus_get_dma_tag, bus_generic_get_dma_tag), DEVMETHOD(bus_read_ivar, cardbus_read_ivar), DEVMETHOD(bus_driver_added, cardbus_driver_added), Modified: head/sys/dev/pci/pci.c ============================================================================== --- head/sys/dev/pci/pci.c Fri Mar 2 20:34:15 2012 (r232402) +++ head/sys/dev/pci/pci.c Fri Mar 2 20:38:04 2012 (r232403) @@ -70,6 +70,19 @@ __FBSDID("$FreeBSD$"); #include "pcib_if.h" #include "pci_if.h" +/* + * XXX: Due to a limitation of the bus_dma_tag_create() API, we cannot + * specify a 4GB boundary on 32-bit targets. Usually this does not + * matter as it is ok to use a boundary of 0 on these systems. + * However, in the case of PAE, DMA addresses can cross a 4GB + * boundary, so as a workaround use a 2GB boundary. + */ +#ifdef PAE +#define PCI_DMA_BOUNDARY (1u << 31) +#else +#define PCI_DMA_BOUNDARY ((bus_size_t)((uint64_t)1 << 32)) +#endif + #define PCIR_IS_BIOS(cfg, reg) \ (((cfg)->hdrtype == PCIM_HDRTYPE_NORMAL && reg == PCIR_BIOS) || \ ((cfg)->hdrtype == PCIM_HDRTYPE_BRIDGE && reg == PCIR_BIOS_1)) @@ -95,6 +108,7 @@ static void pci_load_vendor_data(void); static int pci_describe_parse_line(char **ptr, int *vendor, int *device, char **desc); static char *pci_describe_device(device_t dev); +static bus_dma_tag_t pci_get_dma_tag(device_t bus, device_t dev); static int pci_modevent(module_t mod, int what, void *arg); static void pci_hdrtypedata(device_t pcib, int b, int s, int f, pcicfgregs *cfg); @@ -137,6 +151,7 @@ static device_method_t pci_methods[] = { DEVMETHOD(bus_setup_intr, pci_setup_intr), DEVMETHOD(bus_teardown_intr, pci_teardown_intr), + DEVMETHOD(bus_get_dma_tag, pci_get_dma_tag), DEVMETHOD(bus_get_resource_list,pci_get_resource_list), DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource), DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource), @@ -173,7 +188,7 @@ static device_method_t pci_methods[] = { DEVMETHOD_END }; -DEFINE_CLASS_0(pci, pci_driver, pci_methods, 0); +DEFINE_CLASS_0(pci, pci_driver, pci_methods, sizeof(struct pci_softc)); static devclass_t pci_devclass; DRIVER_MODULE(pci, pcib, pci_driver, pci_devclass, pci_modevent, 0); @@ -3124,10 +3139,41 @@ pci_probe(device_t dev) return (BUS_PROBE_GENERIC); } +int +pci_attach_common(device_t dev) +{ + struct pci_softc *sc; + int busno, domain, error; + + sc = device_get_softc(dev); + domain = pcib_get_domain(dev); + busno = pcib_get_bus(dev); + if (bootverbose) + device_printf(dev, "domain=%d, physical bus=%d\n", + domain, busno); + 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, + PCI_DMA_BOUNDARY, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, + NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED, + BUS_SPACE_MAXSIZE, 0, NULL, NULL, &sc->sc_dma_tag); + if (error) + device_printf(dev, "Failed to create DMA tag: %d\n", + error); + else + sc->sc_dma_tag_valid = 1; + } + return (0); +} + static int pci_attach(device_t dev) { - int busno, domain; + int busno, domain, error; + + error = pci_attach_common(dev); + if (error) + return (error); /* * Since there can be multiple independantly numbered PCI @@ -3137,9 +3183,6 @@ pci_attach(device_t dev) */ domain = pcib_get_domain(dev); busno = pcib_get_bus(dev); - if (bootverbose) - device_printf(dev, "domain=%d, physical bus=%d\n", - domain, busno); pci_add_children(dev, domain, busno, sizeof(struct pci_devinfo)); return (bus_generic_attach(dev)); } @@ -4226,6 +4269,16 @@ pci_get_resource_list (device_t dev, dev return (&dinfo->resources); } +bus_dma_tag_t +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)); +} + uint32_t pci_read_config_method(device_t dev, device_t child, int reg, int width) { Modified: head/sys/dev/pci/pci_private.h ============================================================================== --- head/sys/dev/pci/pci_private.h Fri Mar 2 20:34:15 2012 (r232402) +++ head/sys/dev/pci/pci_private.h Fri Mar 2 20:38:04 2012 (r232403) @@ -38,6 +38,11 @@ */ 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; extern int pci_do_power_suspend; @@ -46,6 +51,7 @@ void pci_add_children(device_t dev, int void pci_add_child(device_t bus, struct pci_devinfo *dinfo); void pci_add_resources(device_t bus, device_t dev, int force, uint32_t prefetchmask); +int pci_attach_common(device_t dev); void pci_delete_child(device_t dev, device_t child); void pci_driver_added(device_t dev, driver_t *driver); int pci_print_child(device_t dev, device_t child); Modified: head/sys/powerpc/ofw/ofw_pcibus.c ============================================================================== --- head/sys/powerpc/ofw/ofw_pcibus.c Fri Mar 2 20:34:15 2012 (r232402) +++ head/sys/powerpc/ofw/ofw_pcibus.c Fri Mar 2 20:38:04 2012 (r232403) @@ -95,8 +95,8 @@ struct ofw_pcibus_devinfo { static devclass_t pci_devclass; -DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods, 1 /* no softc */, - pci_driver); +DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods, + sizeof(struct pci_softc), pci_driver); DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcibus_driver, pci_devclass, 0, 0); MODULE_VERSION(ofw_pcibus, 1); MODULE_DEPEND(ofw_pcibus, pci, 1, 1, 1); @@ -116,12 +116,13 @@ static int ofw_pcibus_attach(device_t dev) { u_int busno, domain; + int error; + error = pci_attach_common(dev); + if (error) + return (error); domain = pcib_get_domain(dev); busno = pcib_get_bus(dev); - if (bootverbose) - device_printf(dev, "domain=%d, physical bus=%d\n", - domain, busno); /* * Attach those children represented in the device tree. Modified: head/sys/sparc64/pci/ofw_pcibus.c ============================================================================== --- head/sys/sparc64/pci/ofw_pcibus.c Fri Mar 2 20:34:15 2012 (r232402) +++ head/sys/sparc64/pci/ofw_pcibus.c Fri Mar 2 20:38:04 2012 (r232403) @@ -100,8 +100,8 @@ struct ofw_pcibus_devinfo { static devclass_t pci_devclass; -DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods, 1 /* no softc */, - pci_driver); +DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods, + sizeof(struct pci_softc), pci_driver); EARLY_DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcibus_driver, pci_devclass, 0, 0, BUS_PASS_BUS); MODULE_VERSION(ofw_pcibus, 1); @@ -230,13 +230,14 @@ ofw_pcibus_attach(device_t dev) phandle_t node, child; uint32_t clock; u_int busno, domain, func, slot; + int error; + error = pci_attach_common(dev); + if (error) + return (error); pcib = device_get_parent(dev); domain = pcib_get_domain(dev); busno = pcib_get_bus(dev); - if (bootverbose) - device_printf(dev, "domain=%d, physical bus=%d\n", - domain, busno); node = ofw_bus_get_node(dev); /*
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