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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* QEMU sPAPR PCI host for VFIO
*
* Copyright (c) 2011-2014 Alexey Kardashevskiy, IBM Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* 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 "qemu/osdep.h"
#include <linux/vfio.h>
#include "hw/ppc/spapr.h"
#include "hw/pci-host/spapr.h"
#include "hw/pci/msix.h"
#include "hw/pci/pci_device.h"
#include "hw/vfio/vfio.h"
#include "qemu/error-report.h"
bool spapr_phb_eeh_available(SpaprPhbState *sphb)
{
return vfio_eeh_as_ok(&sphb->iommu_as);
}
static void spapr_phb_vfio_eeh_reenable(SpaprPhbState *sphb)
{
vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_ENABLE);
}
void spapr_phb_vfio_reset(DeviceState *qdev)
{
/*
* The PE might be in frozen state. To reenable the EEH
* functionality on it will clean the frozen state, which
* ensures that the contained PCI devices will work properly
* after reboot.
*/
spapr_phb_vfio_eeh_reenable(SPAPR_PCI_HOST_BRIDGE(qdev));
}
static void spapr_eeh_pci_find_device(PCIBus *bus, PCIDevice *pdev,
void *opaque)
{
bool *found = opaque;
if (object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
*found = true;
}
}
int spapr_phb_vfio_eeh_set_option(SpaprPhbState *sphb,
unsigned int addr, int option)
{
uint32_t op;
int ret;
switch (option) {
case RTAS_EEH_DISABLE:
op = VFIO_EEH_PE_DISABLE;
break;
case RTAS_EEH_ENABLE: {
PCIHostState *phb;
bool found = false;
/*
* The EEH functionality is enabled per sphb level instead of
* per PCI device. We have already identified this specific sphb
* based on buid passed as argument to ibm,set-eeh-option rtas
* call. Now we just need to check the validity of the PCI
* pass-through devices (vfio-pci) under this sphb bus.
* We have already validated that all the devices under this sphb
* are from same iommu group (within same PE) before comming here.
*
* Prior to linux commit 98ba956f6a389 ("powerpc/pseries/eeh:
* Rework device EEH PE determination") kernel would call
* eeh-set-option for each device in the PE using the device's
* config_address as the argument rather than the PE address.
* Hence if we check validity of supplied config_addr whether
* it matches to this PHB will cause issues with older kernel
* versions v5.9 and older. If we return an error from
* eeh-set-option when the argument isn't a valid PE address
* then older kernels (v5.9 and older) will interpret that as
* EEH not being supported.
*/
phb = PCI_HOST_BRIDGE(sphb);
pci_for_each_device(phb->bus, (addr >> 16) & 0xFF,
spapr_eeh_pci_find_device, &found);
if (!found) {
return RTAS_OUT_PARAM_ERROR;
}
op = VFIO_EEH_PE_ENABLE;
break;
}
case RTAS_EEH_THAW_IO:
op = VFIO_EEH_PE_UNFREEZE_IO;
break;
case RTAS_EEH_THAW_DMA:
op = VFIO_EEH_PE_UNFREEZE_DMA;
break;
default:
return RTAS_OUT_PARAM_ERROR;
}
ret = vfio_eeh_as_op(&sphb->iommu_as, op);
if (ret < 0) {
return RTAS_OUT_HW_ERROR;
}
return RTAS_OUT_SUCCESS;
}
int spapr_phb_vfio_eeh_get_state(SpaprPhbState *sphb, int *state)
{
int ret;
ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_GET_STATE);
if (ret < 0) {
return RTAS_OUT_PARAM_ERROR;
}
*state = ret;
return RTAS_OUT_SUCCESS;
}
static void spapr_phb_vfio_eeh_clear_dev_msix(PCIBus *bus,
PCIDevice *pdev,
void *opaque)
{
/* Check if the device is VFIO PCI device */
if (!object_dynamic_cast(OBJECT(pdev), "vfio-pci")) {
return;
}
/*
* The MSIx table will be cleaned out by reset. We need
* disable it so that it can be reenabled properly. Also,
* the cached MSIx table should be cleared as it's not
* reflecting the contents in hardware.
*/
if (msix_enabled(pdev)) {
uint16_t flags;
flags = pci_host_config_read_common(pdev,
pdev->msix_cap + PCI_MSIX_FLAGS,
pci_config_size(pdev), 2);
flags &= ~PCI_MSIX_FLAGS_ENABLE;
pci_host_config_write_common(pdev,
pdev->msix_cap + PCI_MSIX_FLAGS,
pci_config_size(pdev), flags, 2);
}
msix_reset(pdev);
}
static void spapr_phb_vfio_eeh_clear_bus_msix(PCIBus *bus, void *opaque)
{
pci_for_each_device_under_bus(bus, spapr_phb_vfio_eeh_clear_dev_msix,
NULL);
}
static void spapr_phb_vfio_eeh_pre_reset(SpaprPhbState *sphb)
{
PCIHostState *phb = PCI_HOST_BRIDGE(sphb);
pci_for_each_bus(phb->bus, spapr_phb_vfio_eeh_clear_bus_msix, NULL);
}
int spapr_phb_vfio_eeh_reset(SpaprPhbState *sphb, int option)
{
uint32_t op;
int ret;
switch (option) {
case RTAS_SLOT_RESET_DEACTIVATE:
op = VFIO_EEH_PE_RESET_DEACTIVATE;
break;
case RTAS_SLOT_RESET_HOT:
spapr_phb_vfio_eeh_pre_reset(sphb);
op = VFIO_EEH_PE_RESET_HOT;
break;
case RTAS_SLOT_RESET_FUNDAMENTAL:
spapr_phb_vfio_eeh_pre_reset(sphb);
op = VFIO_EEH_PE_RESET_FUNDAMENTAL;
break;
default:
return RTAS_OUT_PARAM_ERROR;
}
ret = vfio_eeh_as_op(&sphb->iommu_as, op);
if (ret < 0) {
return RTAS_OUT_HW_ERROR;
}
return RTAS_OUT_SUCCESS;
}
int spapr_phb_vfio_eeh_configure(SpaprPhbState *sphb)
{
int ret;
ret = vfio_eeh_as_op(&sphb->iommu_as, VFIO_EEH_PE_CONFIGURE);
if (ret < 0) {
return RTAS_OUT_PARAM_ERROR;
}
return RTAS_OUT_SUCCESS;
}
|
