/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2011 Hudson River Trading LLC * Written by: John H. Baldwin * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); /* * Support APIs for Host to PCI bridge drivers and drivers that * provide PCI domains. */ #include #include #include #include #include #include #include #include /* * Try to read the bus number of a host-PCI bridge using appropriate config * registers. */ int host_pcib_get_busno(pci_read_config_fn read_config, int bus, int slot, int func, uint8_t *busnum) { uint32_t id; id = read_config(bus, slot, func, PCIR_DEVVENDOR, 4); if (id == 0xffffffff) return (0); switch (id) { case 0x12258086: /* Intel 824?? */ /* XXX This is a guess */ /* *busnum = read_config(bus, slot, func, 0x41, 1); */ *busnum = bus; break; case 0x84c48086: /* Intel 82454KX/GX (Orion) */ *busnum = read_config(bus, slot, func, 0x4a, 1); break; case 0x84ca8086: /* * For the 450nx chipset, there is a whole bundle of * things pretending to be host bridges. The MIOC will * be seen first and isn't really a pci bridge (the * actual buses are attached to the PXB's). We need to * read the registers of the MIOC to figure out the * bus numbers for the PXB channels. * * Since the MIOC doesn't have a pci bus attached, we * pretend it wasn't there. */ return (0); case 0x84cb8086: switch (slot) { case 0x12: /* Intel 82454NX PXB#0, Bus#A */ *busnum = read_config(bus, 0x10, func, 0xd0, 1); break; case 0x13: /* Intel 82454NX PXB#0, Bus#B */ *busnum = read_config(bus, 0x10, func, 0xd1, 1) + 1; break; case 0x14: /* Intel 82454NX PXB#1, Bus#A */ *busnum = read_config(bus, 0x10, func, 0xd3, 1); break; case 0x15: /* Intel 82454NX PXB#1, Bus#B */ *busnum = read_config(bus, 0x10, func, 0xd4, 1) + 1; break; } break; /* ServerWorks -- vendor 0x1166 */ case 0x00051166: case 0x00061166: case 0x00081166: case 0x00091166: case 0x00101166: case 0x00111166: case 0x00171166: case 0x01011166: case 0x010f1014: case 0x01101166: case 0x02011166: case 0x02251166: case 0x03021014: *busnum = read_config(bus, slot, func, 0x44, 1); break; /* Compaq/HP -- vendor 0x0e11 */ case 0x60100e11: *busnum = read_config(bus, slot, func, 0xc8, 1); break; default: /* Don't know how to read bus number. */ return 0; } return 1; } #ifdef NEW_PCIB /* * Return a pointer to a pretty name for a PCI device. If the device * has a driver attached, the device's name is used, otherwise a name * is generated from the device's PCI address. */ const char * pcib_child_name(device_t child) { static char buf[64]; if (device_get_nameunit(child) != NULL) return (device_get_nameunit(child)); snprintf(buf, sizeof(buf), "pci%d:%d:%d:%d", pci_get_domain(child), pci_get_bus(child), pci_get_slot(child), pci_get_function(child)); return (buf); } /* * Some Host-PCI bridge drivers know which resource ranges they can * decode and should only allocate subranges to child PCI devices. * This API provides a way to manage this. The bridge driver should * initialize this structure during attach and call * pcib_host_res_decodes() on each resource range it decodes. It can * then use pcib_host_res_alloc() and pcib_host_res_adjust() as helper * routines for BUS_ALLOC_RESOURCE() and BUS_ADJUST_RESOURCE(). This * API assumes that resources for any decoded ranges can be safely * allocated from the parent via bus_generic_alloc_resource(). */ int pcib_host_res_init(device_t pcib, struct pcib_host_resources *hr) { hr->hr_pcib = pcib; resource_list_init(&hr->hr_rl); return (0); } int pcib_host_res_free(device_t pcib, struct pcib_host_resources *hr) { resource_list_free(&hr->hr_rl); return (0); } int pcib_host_res_decodes(struct pcib_host_resources *hr, int type, rman_res_t start, rman_res_t end, u_int flags) { struct resource_list_entry *rle; int rid; if (bootverbose) device_printf(hr->hr_pcib, "decoding %d %srange %#jx-%#jx\n", type, flags & RF_PREFETCHABLE ? "prefetchable ": "", start, end); rid = resource_list_add_next(&hr->hr_rl, type, start, end, end - start + 1); if (flags & RF_PREFETCHABLE) { KASSERT(type == SYS_RES_MEMORY, ("only memory is prefetchable")); rle = resource_list_find(&hr->hr_rl, type, rid); rle->flags = RLE_PREFETCH; } return (0); } struct resource * pcib_host_res_alloc(struct pcib_host_resources *hr, device_t dev, int type, int *rid, rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) { struct resource_list_entry *rle; struct resource *r; rman_res_t new_start, new_end; if (flags & RF_PREFETCHABLE) KASSERT(type == SYS_RES_MEMORY, ("only memory is prefetchable")); rle = resource_list_find(&hr->hr_rl, type, 0); if (rle == NULL) { /* * No decoding ranges for this resource type, just pass * the request up to the parent. */ return (bus_generic_alloc_resource(hr->hr_pcib, dev, type, rid, start, end, count, flags)); } restart: /* Try to allocate from each decoded range. */ for (; rle != NULL; rle = STAILQ_NEXT(rle, link)) { if (rle->type != type) continue; if (((flags & RF_PREFETCHABLE) != 0) != ((rle->flags & RLE_PREFETCH) != 0)) continue; new_start = ummax(start, rle->start); new_end = ummin(end, rle->end); if (new_start > new_end || new_start + count - 1 > new_end || new_start + count < new_start) continue; r = bus_generic_alloc_resource(hr->hr_pcib, dev, type, rid, new_start, new_end, count, flags); if (r != NULL) { if (bootverbose) device_printf(hr->hr_pcib, "allocated type %d (%#jx-%#jx) for rid %x of %s\n", type, rman_get_start(r), rman_get_end(r), *rid, pcib_child_name(dev)); return (r); } } /* * If we failed to find a prefetch range for a memory * resource, try again without prefetch. */ if (flags & RF_PREFETCHABLE) { flags &= ~RF_PREFETCHABLE; rle = resource_list_find(&hr->hr_rl, type, 0); goto restart; } return (NULL); } int pcib_host_res_adjust(struct pcib_host_resources *hr, device_t dev, int type, struct resource *r, rman_res_t start, rman_res_t end) { struct resource_list_entry *rle; rle = resource_list_find(&hr->hr_rl, type, 0); if (rle == NULL) { /* * No decoding ranges for this resource type, just pass * the request up to the parent. */ return (bus_generic_adjust_resource(hr->hr_pcib, dev, type, r, start, end)); } /* Only allow adjustments that stay within a decoded range. */ for (; rle != NULL; rle = STAILQ_NEXT(rle, link)) { if (rle->start <= start && rle->end >= end) return (bus_generic_adjust_resource(hr->hr_pcib, dev, type, r, start, end)); } return (ERANGE); } #ifdef PCI_RES_BUS struct pci_domain { int pd_domain; struct rman pd_bus_rman; TAILQ_ENTRY(pci_domain) pd_link; }; static TAILQ_HEAD(, pci_domain) domains = TAILQ_HEAD_INITIALIZER(domains); /* * Each PCI domain maintains its own resource manager for PCI bus * numbers in that domain. Domain objects are created on first use. * Host to PCI bridge drivers and PCI-PCI bridge drivers should * allocate their bus ranges from their domain. */ static struct pci_domain * pci_find_domain(int domain) { struct pci_domain *d; char buf[64]; int error; TAILQ_FOREACH(d, &domains, pd_link) { if (d->pd_domain == domain) return (d); } snprintf(buf, sizeof(buf), "PCI domain %d bus numbers", domain); d = malloc(sizeof(*d) + strlen(buf) + 1, M_DEVBUF, M_WAITOK | M_ZERO); d->pd_domain = domain; d->pd_bus_rman.rm_start = 0; d->pd_bus_rman.rm_end = PCI_BUSMAX; d->pd_bus_rman.rm_type = RMAN_ARRAY; strcpy((char *)(d + 1), buf); d->pd_bus_rman.rm_descr = (char *)(d + 1); error = rman_init(&d->pd_bus_rman); if (error == 0) error = rman_manage_region(&d->pd_bus_rman, 0, PCI_BUSMAX); if (error) panic("Failed to initialize PCI domain %d rman", domain); TAILQ_INSERT_TAIL(&domains, d, pd_link); return (d); } struct resource * pci_domain_alloc_bus(int domain, device_t dev, int *rid, rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) { struct pci_domain *d; struct resource *res; if (domain < 0 || domain > PCI_DOMAINMAX) return (NULL); d = pci_find_domain(domain); res = rman_reserve_resource(&d->pd_bus_rman, start, end, count, flags, dev); if (res == NULL) return (NULL); rman_set_rid(res, *rid); return (res); } int pci_domain_adjust_bus(int domain, device_t dev, struct resource *r, rman_res_t start, rman_res_t end) { #ifdef INVARIANTS struct pci_domain *d; #endif if (domain < 0 || domain > PCI_DOMAINMAX) return (EINVAL); #ifdef INVARIANTS d = pci_find_domain(domain); KASSERT(rman_is_region_manager(r, &d->pd_bus_rman), ("bad resource")); #endif return (rman_adjust_resource(r, start, end)); } int pci_domain_release_bus(int domain, device_t dev, int rid, struct resource *r) { #ifdef INVARIANTS struct pci_domain *d; #endif if (domain < 0 || domain > PCI_DOMAINMAX) return (EINVAL); #ifdef INVARIANTS d = pci_find_domain(domain); KASSERT(rman_is_region_manager(r, &d->pd_bus_rman), ("bad resource")); #endif return (rman_release_resource(r)); } #endif /* PCI_RES_BUS */ #endif /* NEW_PCIB */