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driver would verify that requests for child devices were confined to any existing I/O windows, but the driver relied on the firmware to initialize the windows and would never grow the windows for new requests. Now the driver actively manages the I/O windows. This is implemented by allocating a bus resource for each I/O window from the parent PCI bus and suballocating that resource to child devices. The suballocations are managed by creating an rman for each I/O window. The suballocated resources are mapped by passing the bus_activate_resource() call up to the parent PCI bus. Windows are grown when needed by using bus_adjust_resource() to adjust the resource allocated from the parent PCI bus. If the adjust request succeeds, the window is adjusted and the suballocation request for the child device is retried. When growing a window, the rman_first_free_region() and rman_last_free_region() routines are used to determine if the front or end of the existing I/O window is free. From using that, the smallest ranges that need to be added to either the front or back of the window are computed. The driver will first try to grow the window in whichever direction requires the smallest growth first followed by the other direction if that fails. Subtractive bridges will first attempt to satisfy requests for child resources from I/O windows (including attempts to grow the windows). If that fails, the request is passed up to the parent PCI bus directly however. The PCI-PCI bridge driver will try to use firmware-assigned ranges for child BARs first and only allocate a "fresh" range if that specific range cannot be accommodated in the I/O window. This allows systems where the firmware assigns resources during boot but later wipes the I/O windows (some ACPI BIOSen are known to do this) to "rediscover" the original I/O window ranges. The ACPI Host-PCI bridge driver has been adjusted to correctly honor hw.acpi.host_mem_start and the I/O port equivalent when a PCI-PCI bridge makes a wildcard request for an I/O window range. The new PCI-PCI bridge driver is only enabled if the NEW_PCIB kernel option is enabled. This is a transition aide to allow platforms that do not yet support bus_activate_resource() and bus_adjust_resource() in their Host-PCI bridge drivers (and possibly other drivers as needed) to use the old driver for now. Once all platforms support the new driver, the kernel option and old driver will be removed. PR: kern/143874 kern/149306 Tested by: mav
118 lines
4.7 KiB
C
118 lines
4.7 KiB
C
/*-
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* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
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* Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __PCIB_PRIVATE_H__
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#define __PCIB_PRIVATE_H__
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/*
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* Export portions of generic PCI:PCI bridge support so that it can be
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* used by subclasses.
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*/
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DECLARE_CLASS(pcib_driver);
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#ifdef NEW_PCIB
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#define WIN_IO 0x1
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#define WIN_MEM 0x2
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#define WIN_PMEM 0x4
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struct pcib_window {
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pci_addr_t base; /* base address */
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pci_addr_t limit; /* topmost address */
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struct rman rman;
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struct resource *res;
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int reg; /* resource id from parent */
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int valid;
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int mask; /* WIN_* bitmask of this window */
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int step; /* log_2 of window granularity */
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const char *name;
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};
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#endif
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/*
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* Bridge-specific data.
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*/
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struct pcib_softc
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{
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device_t dev;
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uint32_t flags; /* flags */
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#define PCIB_SUBTRACTIVE 0x1
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#define PCIB_DISABLE_MSI 0x2
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uint16_t command; /* command register */
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u_int domain; /* domain number */
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u_int pribus; /* primary bus number */
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u_int secbus; /* secondary bus number */
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u_int subbus; /* subordinate bus number */
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#ifdef NEW_PCIB
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struct pcib_window io; /* I/O port window */
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struct pcib_window mem; /* memory window */
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struct pcib_window pmem; /* prefetchable memory window */
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#else
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pci_addr_t pmembase; /* base address of prefetchable memory */
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pci_addr_t pmemlimit; /* topmost address of prefetchable memory */
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pci_addr_t membase; /* base address of memory window */
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pci_addr_t memlimit; /* topmost address of memory window */
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uint32_t iobase; /* base address of port window */
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uint32_t iolimit; /* topmost address of port window */
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#endif
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uint16_t secstat; /* secondary bus status register */
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uint16_t bridgectl; /* bridge control register */
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uint8_t seclat; /* secondary bus latency timer */
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};
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typedef uint32_t pci_read_config_fn(int b, int s, int f, int reg, int width);
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int host_pcib_get_busno(pci_read_config_fn read_config, int bus,
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int slot, int func, uint8_t *busnum);
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int pcib_attach(device_t dev);
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void pcib_attach_common(device_t dev);
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int pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result);
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int pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value);
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struct resource *pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
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u_long start, u_long end, u_long count, u_int flags);
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#ifdef NEW_PCIB
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int pcib_adjust_resource(device_t bus, device_t child, int type,
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struct resource *r, u_long start, u_long end);
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int pcib_release_resource(device_t dev, device_t child, int type, int rid,
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struct resource *r);
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#endif
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int pcib_maxslots(device_t dev);
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uint32_t pcib_read_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, int width);
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void pcib_write_config(device_t dev, u_int b, u_int s, u_int f, u_int reg, uint32_t val, int width);
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int pcib_route_interrupt(device_t pcib, device_t dev, int pin);
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int pcib_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs);
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int pcib_release_msi(device_t pcib, device_t dev, int count, int *irqs);
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int pcib_alloc_msix(device_t pcib, device_t dev, int *irq);
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int pcib_release_msix(device_t pcib, device_t dev, int irq);
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int pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data);
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#endif
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