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
|
/*
* Based on Linux drivers/pci/ecam.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <xen/pci.h>
#include <xen/sched.h>
/*
* Function to implement the pci_ops->map_bus method.
*/
void __iomem *pci_ecam_map_bus(struct pci_host_bridge *bridge,
pci_sbdf_t sbdf, uint32_t where)
{
const struct pci_config_window *cfg = bridge->cfg;
const struct pci_ecam_ops *ops =
container_of(bridge->ops, const struct pci_ecam_ops, pci_ops);
unsigned int devfn_shift = ops->bus_shift - 8;
void __iomem *base;
unsigned int busn = sbdf.bus;
if ( busn < cfg->busn_start || busn > cfg->busn_end )
return NULL;
busn -= cfg->busn_start;
base = cfg->win + (busn << ops->bus_shift);
return base + (sbdf.devfn << devfn_shift) + where;
}
bool __init pci_ecam_need_p2m_hwdom_mapping(struct domain *d,
struct pci_host_bridge *bridge,
uint64_t addr)
{
struct pci_config_window *cfg = bridge->cfg;
/*
* We do not want ECAM address space to be mapped in Domain-0's p2m,
* so we can trap access to it.
*/
return cfg->phys_addr != addr;
}
/* ECAM ops */
const struct pci_ecam_ops pci_generic_ecam_ops = {
.bus_shift = 20,
.pci_ops = {
.map_bus = pci_ecam_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
.need_p2m_hwdom_mapping = pci_ecam_need_p2m_hwdom_mapping,
}
};
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
