5fe82bca57
- First off, device drivers really do need to know if they are allocating
MSI or MSI-X messages. MSI requires allocating powerof2() messages for
example where MSI-X does not. To address this, split out the MSI-X
support from pci_msi_count() and pci_alloc_msi() into new driver-visible
functions pci_msix_count() and pci_alloc_msix(). As a result,
pci_msi_count() now just returns a count of the max supported MSI
messages for the device, and pci_alloc_msi() only tries to allocate MSI
messages. To get a count of the max supported MSI-X messages, use
pci_msix_count(). To allocate MSI-X messages, use pci_alloc_msix().
pci_release_msi() still handles both MSI and MSI-X messages, however.
As a result of this change, drivers using the existing API will only
use MSI messages and will no longer try to use MSI-X messages.
- Because MSI-X allows for each message to have its own data and address
values (and thus does not require all of the messages to have their
MD vectors allocated as a group), some devices allow for "sparse" use
of MSI-X message slots. For example, if a device supports 8 messages
but the OS is only able to allocate 2 messages, the device may make the
best use of 2 IRQs if it enables the messages at slots 1 and 4 rather
than default of using the first N slots (or indicies) at 1 and 2. To
support this, add a new pci_remap_msix() function that a driver may call
after a successful pci_alloc_msix() (but before allocating any of the
SYS_RES_IRQ resources) to allow the allocated IRQ resources to be
assigned to different message indices. For example, from the earlier
example, after pci_alloc_msix() returned a value of 2, the driver would
call pci_remap_msix() passing in array of integers { 1, 4 } as the
new message indices to use. The rid's for the SYS_RES_IRQ resources
will always match the message indices. Thus, after the call to
pci_remap_msix() the driver would be able to access the first message
in slot 1 at SYS_RES_IRQ rid 1, and the second message at slot 4 at
SYS_RES_IRQ rid 4. Note that the message slots/indices are 1-based
rather than 0-based so that they will always correspond to the rid
values (SYS_RES_IRQ rid 0 is reserved for the legacy INTx interrupt).
To support this API, a new PCIB_REMAP_MSIX() method was added to the
pcib interface to change the message index for a single IRQ.
Tested by: scottl
97 lines
4.3 KiB
C
97 lines
4.3 KiB
C
/*-
|
|
* Copyright (c) 1997, Stefan Esser <se@freebsd.org>
|
|
* Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
|
|
* Copyright (c) 2000, BSDi
|
|
* 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 unmodified, 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 ``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 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.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
#ifndef _PCI_PRIVATE_H_
|
|
#define _PCI_PRIVATE_H_
|
|
|
|
/*
|
|
* Export definitions of the pci bus so that we can more easily share
|
|
* it with "subclass" busses.
|
|
*/
|
|
DECLARE_CLASS(pci_driver);
|
|
|
|
void pci_add_children(device_t dev, int busno, size_t dinfo_size);
|
|
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);
|
|
void pci_driver_added(device_t dev, driver_t *driver);
|
|
int pci_print_child(device_t dev, device_t child);
|
|
void pci_probe_nomatch(device_t dev, device_t child);
|
|
int pci_read_ivar(device_t dev, device_t child, int which,
|
|
uintptr_t *result);
|
|
int pci_write_ivar(device_t dev, device_t child, int which,
|
|
uintptr_t value);
|
|
int pci_get_vpd_ident_method(device_t dev, device_t child,
|
|
const char **identptr);
|
|
int pci_get_vpd_readonly_method(device_t dev, device_t child,
|
|
const char *kw, const char **vptr);
|
|
int pci_set_powerstate_method(device_t dev, device_t child,
|
|
int state);
|
|
int pci_get_powerstate_method(device_t dev, device_t child);
|
|
uint32_t pci_read_config_method(device_t dev, device_t child,
|
|
int reg, int width);
|
|
void pci_write_config_method(device_t dev, device_t child,
|
|
int reg, uint32_t val, int width);
|
|
int pci_enable_busmaster_method(device_t dev, device_t child);
|
|
int pci_disable_busmaster_method(device_t dev, device_t child);
|
|
int pci_enable_io_method(device_t dev, device_t child, int space);
|
|
int pci_disable_io_method(device_t dev, device_t child, int space);
|
|
int pci_find_extcap_method(device_t dev, device_t child,
|
|
int capability, int *capreg);
|
|
int pci_alloc_msi_method(device_t dev, device_t child, int *count);
|
|
int pci_alloc_msix_method(device_t dev, device_t child, int *count);
|
|
int pci_remap_msix_method(device_t dev, device_t child,
|
|
u_int *indices);
|
|
int pci_release_msi_method(device_t dev, device_t child);
|
|
int pci_msi_count_method(device_t dev, device_t child);
|
|
int pci_msix_count_method(device_t dev, device_t child);
|
|
struct resource *pci_alloc_resource(device_t dev, device_t child,
|
|
int type, int *rid, u_long start, u_long end, u_long count,
|
|
u_int flags);
|
|
void pci_delete_resource(device_t dev, device_t child,
|
|
int type, int rid);
|
|
struct resource_list *pci_get_resource_list (device_t dev, device_t child);
|
|
struct pci_devinfo *pci_read_device(device_t pcib, int b, int s, int f,
|
|
size_t size);
|
|
void pci_print_verbose(struct pci_devinfo *dinfo);
|
|
int pci_freecfg(struct pci_devinfo *dinfo);
|
|
int pci_child_location_str_method(device_t cbdev, device_t child,
|
|
char *buf, size_t buflen);
|
|
int pci_child_pnpinfo_str_method(device_t cbdev, device_t child,
|
|
char *buf, size_t buflen);
|
|
int pci_assign_interrupt_method(device_t dev, device_t child);
|
|
int pci_resume(device_t dev);
|
|
int pci_suspend(device_t dev);
|
|
void pci_cfg_restore(device_t, struct pci_devinfo *);
|
|
void pci_cfg_save(device_t, struct pci_devinfo *, int);
|
|
|
|
#endif /* _PCI_PRIVATE_H_ */
|