6b0ff427a5
A while back, Warner changed the PCI bus code to reserve resources when enumerating devices and simply give devices the previously allocated resources when they call bus_alloc_resource(). This ensures that address ranges being decoded by a BAR are always allocated in the nexus0 device (or whatever device the PCI bus gets its address space from) even if a device driver is not attached to the device. This patch extends this behavior further: - To let the PCI bus distinguish between a resource being allocated by a device driver vs. merely being allocated by the bus, use rman_set_device() to assign the device to the bus when it is owned by the bus and to the child device when it is allocated by the child device's driver. We can now prevent a device driver from allocating the same device twice. Doing so could result in odd things like allocating duplicate virtual memory to map the resource on some archs and leaking the original mapping. - When a PCI device driver releases a resource, don't pass the request all the way up the tree and release it in the nexus (or similar device) since the BAR is still active and decoding. Otherwise, another device could later allocate the same range even though it is still in use. Instead, deactivate the resource and assign it back to the PCI bus using rman_set_device(). - pci_delete_resource() will actually completely free a BAR including attemping to disable it. - Disable BAR decoding via the command register when sizing a BAR in pci_alloc_map() which is used to allocate resources for a BAR when the BIOS/firmware did not assign a usable resource range during boot. This mirrors an earlier fix to pci_add_map() which is used when to size BARs during boot. - Move the activation of I/O decoding in the PCI command register into pci_activate_resource() instead of doing it in pci_alloc_resource(). Previously we could actually enable decoding before a BAR was initialized via pci_alloc_map(). Glanced at by: bsdimp
117 lines
5.2 KiB
C
117 lines
5.2 KiB
C
/*-
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* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
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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 unmodified, this list of conditions, and the following
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef _PCI_PRIVATE_H_
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#define _PCI_PRIVATE_H_
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/*
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* Export definitions of the pci bus so that we can more easily share
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* it with "subclass" busses.
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*/
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DECLARE_CLASS(pci_driver);
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void pci_add_children(device_t dev, int domain, int busno,
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size_t dinfo_size);
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void pci_add_child(device_t bus, struct pci_devinfo *dinfo);
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void pci_add_resources(device_t bus, device_t dev, int force,
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uint32_t prefetchmask);
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void pci_driver_added(device_t dev, driver_t *driver);
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int pci_print_child(device_t dev, device_t child);
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void pci_probe_nomatch(device_t dev, device_t child);
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int pci_read_ivar(device_t dev, device_t child, int which,
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uintptr_t *result);
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int pci_write_ivar(device_t dev, device_t child, int which,
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uintptr_t value);
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int pci_setup_intr(device_t dev, device_t child,
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struct resource *irq, int flags, driver_filter_t *filter,
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driver_intr_t *intr, void *arg, void **cookiep);
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int pci_teardown_intr(device_t dev, device_t child,
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struct resource *irq, void *cookie);
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int pci_get_vpd_ident_method(device_t dev, device_t child,
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const char **identptr);
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int pci_get_vpd_readonly_method(device_t dev, device_t child,
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const char *kw, const char **vptr);
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int pci_set_powerstate_method(device_t dev, device_t child,
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int state);
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int pci_get_powerstate_method(device_t dev, device_t child);
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uint32_t pci_read_config_method(device_t dev, device_t child,
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int reg, int width);
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void pci_write_config_method(device_t dev, device_t child,
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int reg, uint32_t val, int width);
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int pci_enable_busmaster_method(device_t dev, device_t child);
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int pci_disable_busmaster_method(device_t dev, device_t child);
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int pci_enable_io_method(device_t dev, device_t child, int space);
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int pci_disable_io_method(device_t dev, device_t child, int space);
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int pci_find_extcap_method(device_t dev, device_t child,
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int capability, int *capreg);
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int pci_alloc_msi_method(device_t dev, device_t child, int *count);
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int pci_alloc_msix_method(device_t dev, device_t child, int *count);
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int pci_remap_msix_method(device_t dev, device_t child,
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int count, const u_int *vectors);
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int pci_release_msi_method(device_t dev, device_t child);
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int pci_msi_count_method(device_t dev, device_t child);
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int pci_msix_count_method(device_t dev, device_t child);
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struct resource *pci_alloc_resource(device_t dev, device_t child,
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int type, int *rid, u_long start, u_long end, u_long count,
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u_int flags);
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int pci_release_resource(device_t dev, device_t child, int type,
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int rid, struct resource *r);
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int pci_activate_resource(device_t dev, device_t child, int type,
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int rid, struct resource *r);
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void pci_delete_resource(device_t dev, device_t child,
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int type, int rid);
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struct resource_list *pci_get_resource_list (device_t dev, device_t child);
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struct pci_devinfo *pci_read_device(device_t pcib, int d, int b, int s, int f,
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size_t size);
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void pci_print_verbose(struct pci_devinfo *dinfo);
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int pci_freecfg(struct pci_devinfo *dinfo);
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int pci_child_location_str_method(device_t cbdev, device_t child,
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char *buf, size_t buflen);
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int pci_child_pnpinfo_str_method(device_t cbdev, device_t child,
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char *buf, size_t buflen);
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int pci_assign_interrupt_method(device_t dev, device_t child);
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int pci_resume(device_t dev);
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int pci_suspend(device_t dev);
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/** Restore the config register state. The state must be previously
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* saved with pci_cfg_save. However, the pci bus driver takes care of
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* that. This function will also return the device to PCI_POWERSTATE_D0
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* if it is currently in a lower power mode.
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*/
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void pci_cfg_restore(device_t, struct pci_devinfo *);
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/** Save the config register state. Optionally set the power state to D3
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* if the third argument is non-zero.
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*/
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void pci_cfg_save(device_t, struct pci_devinfo *, int);
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#endif /* _PCI_PRIVATE_H_ */
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