blob: d8e29fc0d4068b133a0da0de306c3d14ac5a3b50 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2022 Linutronix GmbH
// Copyright (C) 2022 Intel
#include <linux/export.h>
#include "irq-msi-lib.h"
/**
* msi_lib_init_dev_msi_info - Domain info setup for MSI domains
* @dev: The device for which the domain is created for
* @domain: The domain providing this callback
* @real_parent: The real parent domain of the domain to be initialized
* which might be a domain built on top of @domain or
* @domain itself
* @info: The domain info for the domain to be initialize
*
* This function is to be used for all types of MSI domains above the root
* parent domain and any intermediates. The topmost parent domain specific
* functionality is determined via @real_parent.
*
* All intermediate domains between the root and the device domain must
* have either msi_parent_ops.init_dev_msi_info = msi_parent_init_dev_msi_info
* or invoke it down the line.
*/
bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
struct irq_domain *real_parent,
struct msi_domain_info *info)
{
const struct msi_parent_ops *pops = real_parent->msi_parent_ops;
u32 required_flags;
/* Parent ops available? */
if (WARN_ON_ONCE(!pops))
return false;
/*
* MSI parent domain specific settings. For now there is only the
* root parent domain, e.g. NEXUS, acting as a MSI parent, but it is
* possible to stack MSI parents. See x86 vector -> irq remapping
*/
if (domain->bus_token == pops->bus_select_token) {
if (WARN_ON_ONCE(domain != real_parent))
return false;
} else {
WARN_ON_ONCE(1);
return false;
}
required_flags = pops->required_flags;
/* Is the target domain bus token supported? */
switch(info->bus_token) {
case DOMAIN_BUS_PCI_DEVICE_MSI:
case DOMAIN_BUS_PCI_DEVICE_MSIX:
if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_PCI_MSI)))
return false;
break;
case DOMAIN_BUS_DEVICE_MSI:
/*
* Per device MSI should never have any MSI feature bits
* set. It's sole purpose is to create a dumb interrupt
* chip which has a device specific irq_write_msi_msg()
* callback.
*/
if (WARN_ON_ONCE(info->flags))
return false;
/* Core managed MSI descriptors */
info->flags = MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
fallthrough;
case DOMAIN_BUS_WIRED_TO_MSI:
/* Remove PCI specific flags */
required_flags &= ~MSI_FLAG_PCI_MSI_MASK_PARENT;
break;
default:
/*
* This should never be reached. See
* msi_lib_irq_domain_select()
*/
WARN_ON_ONCE(1);
return false;
}
/*
* Mask out the domain specific MSI feature flags which are not
* supported by the real parent.
*/
info->flags &= pops->supported_flags;
/* Enforce the required flags */
info->flags |= required_flags;
/* Chip updates for all child bus types */
if (!info->chip->irq_eoi)
info->chip->irq_eoi = irq_chip_eoi_parent;
if (!info->chip->irq_ack)
info->chip->irq_ack = irq_chip_ack_parent;
/*
* The device MSI domain can never have a set affinity callback. It
* always has to rely on the parent domain to handle affinity
* settings. The device MSI domain just has to write the resulting
* MSI message into the hardware which is the whole purpose of the
* device MSI domain aside of mask/unmask which is provided e.g. by
* PCI/MSI device domains.
*/
info->chip->irq_set_affinity = msi_domain_set_affinity;
return true;
}
EXPORT_SYMBOL_GPL(msi_lib_init_dev_msi_info);
/**
* msi_lib_irq_domain_select - Shared select function for NEXUS domains
* @d: Pointer to the irq domain on which select is invoked
* @fwspec: Firmware spec describing what is searched
* @bus_token: The bus token for which a matching irq domain is looked up
*
* Returns: %0 if @d is not what is being looked for
*
* %1 if @d is either the domain which is directly searched for or
* if @d is providing the parent MSI domain for the functionality
* requested with @bus_token.
*/
int msi_lib_irq_domain_select(struct irq_domain *d, struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token)
{
const struct msi_parent_ops *ops = d->msi_parent_ops;
u32 busmask = BIT(bus_token);
if (!ops)
return 0;
if (fwspec->fwnode != d->fwnode || fwspec->param_count != 0)
return 0;
/* Handle pure domain searches */
if (bus_token == ops->bus_select_token)
return 1;
return !!(ops->bus_select_mask & busmask);
}
EXPORT_SYMBOL_GPL(msi_lib_irq_domain_select);
|
