mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
9bf4c9c1b0
- Add 3 new functions to the pci_if interface along with suitable wrappers
to provide the device driver visible API:
- pci_alloc_msi(dev, int *count) backed by PCI_ALLOC_MSI(). '*count'
here is an in and out parameter. The driver stores the desired number
of messages in '*count' before calling the function. On success,
'*count' holds the number of messages allocated to the device. Also on
success, the driver can access the messages as SYS_RES_IRQ resources
starting at rid 1. Note that the legacy INTx interrupt resource will
not be available when using MSI. Note that this function will allocate
either MSI or MSI-X messages depending on the devices capabilities and
the 'hw.pci.enable_msix' and 'hw.pci.enable_msi' tunables. Also note
that the driver should activate the memory resource that holds the
MSI-X table and pending bit array (PBA) before calling this function
if the device supports MSI-X.
- pci_release_msi(dev) backed by PCI_RELEASE_MSI(). This function
releases the messages allocated for this device. All of the
SYS_RES_IRQ resources need to be released for this function to succeed.
- pci_msi_count(dev) backed by PCI_MSI_COUNT(). This function returns
the maximum number of MSI or MSI-X messages supported by this device.
MSI-X is preferred if present, but this function will honor the
'hw.pci.enable_msix' and 'hw.pci.enable_msi' tunables. This function
should return the largest value that pci_alloc_msi() can return
(assuming the MD code is able to allocate sufficient backing resources
for all of the messages).
- Add default implementations for these 3 methods to the pci_driver generic
PCI bus driver. (The various other PCI bus drivers such as for ACPI and
OFW will inherit these default implementations.) This default
implementation depends on 4 new pcib_if methods that bubble up through
the PCI bridges to the MD code to allocate IRQ values and perform any
needed MD setup code needed:
- PCIB_ALLOC_MSI() attempts to allocate a group of MSI messages.
- PCIB_RELEASE_MSI() releases a group of MSI messages.
- PCIB_ALLOC_MSIX() attempts to allocate a single MSI-X message.
- PCIB_RELEASE_MSIX() releases a single MSI-X message.
- Add default implementations for these 4 methods that just pass the
request up to the parent bus's parent bridge driver and use the
default implementation in the various MI PCI bridge drivers.
- Add MI functions for use by MD code when managing MSI and MSI-X
interrupts:
- pci_enable_msi(dev, address, data) programs the MSI capability address
and data registers for a group of MSI messages
- pci_enable_msix(dev, index, address, data) initializes a single MSI-X
message in the MSI-X table
- pci_mask_msix(dev, index) masks a single MSI-X message
- pci_unmask_msix(dev, index) unmasks a single MSI-X message
- pci_pending_msix(dev, index) returns true if the specified MSI-X
message is currently pending
- Save the MSI capability address and data registers in the pci_cfgreg
block in a PCI devices ivars and restore the values when a device is
resumed. Note that the MSI-X table is not currently restored during
resume.
- Add constants for MSI-X register offsets and fields.
- Record interesting data about any MSI-X capability blocks we come
across in the pci_cfgreg block in the ivars for PCI devices.
Tested on: em (i386, MSI), bce (amd64/i386, MSI), mpt (amd64, MSI-X)
Reviewed by: scottl, grehan, jfv
MFC after: 2 months
130 lines
2.6 KiB
Objective-C
130 lines
2.6 KiB
Objective-C
#-
|
|
# Copyright (c) 1998 Doug Rabson
|
|
# 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.
|
|
#
|
|
# $FreeBSD$
|
|
#
|
|
|
|
#include <sys/bus.h>
|
|
|
|
INTERFACE pci;
|
|
|
|
CODE {
|
|
static int
|
|
null_msi_count(device_t dev, device_t child)
|
|
{
|
|
return (0);
|
|
}
|
|
};
|
|
|
|
|
|
METHOD u_int32_t read_config {
|
|
device_t dev;
|
|
device_t child;
|
|
int reg;
|
|
int width;
|
|
};
|
|
|
|
METHOD void write_config {
|
|
device_t dev;
|
|
device_t child;
|
|
int reg;
|
|
u_int32_t val;
|
|
int width;
|
|
};
|
|
|
|
METHOD int get_powerstate {
|
|
device_t dev;
|
|
device_t child;
|
|
};
|
|
|
|
METHOD int set_powerstate {
|
|
device_t dev;
|
|
device_t child;
|
|
int state;
|
|
};
|
|
|
|
METHOD int get_vpd_ident {
|
|
device_t dev;
|
|
device_t child;
|
|
const char **identptr;
|
|
};
|
|
|
|
METHOD int get_vpd_readonly {
|
|
device_t dev;
|
|
device_t child;
|
|
const char *kw;
|
|
const char **vptr;
|
|
};
|
|
|
|
METHOD int enable_busmaster {
|
|
device_t dev;
|
|
device_t child;
|
|
};
|
|
|
|
METHOD int disable_busmaster {
|
|
device_t dev;
|
|
device_t child;
|
|
};
|
|
|
|
METHOD int enable_io {
|
|
device_t dev;
|
|
device_t child;
|
|
int space;
|
|
};
|
|
|
|
METHOD int disable_io {
|
|
device_t dev;
|
|
device_t child;
|
|
int space;
|
|
};
|
|
|
|
METHOD int assign_interrupt {
|
|
device_t dev;
|
|
device_t child;
|
|
};
|
|
|
|
METHOD int find_extcap {
|
|
device_t dev;
|
|
device_t child;
|
|
int capability;
|
|
int *capreg;
|
|
};
|
|
|
|
METHOD int alloc_msi {
|
|
device_t dev;
|
|
device_t child;
|
|
int *count;
|
|
};
|
|
|
|
METHOD int release_msi {
|
|
device_t dev;
|
|
device_t child;
|
|
};
|
|
|
|
METHOD int msi_count {
|
|
device_t dev;
|
|
device_t child;
|
|
} DEFAULT null_msi_count;
|