s390x/pci: fix endianness issues
[qemu.git] / hw / s390x / s390-pci-vfio.c
1 /*
2 * s390 vfio-pci interfaces
3 *
4 * Copyright 2020 IBM Corp.
5 * Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or (at
8 * your option) any later version. See the COPYING file in the top-level
9 * directory.
10 */
11
12 #include <sys/ioctl.h>
13 #include <linux/vfio.h>
14 #include <linux/vfio_zdev.h>
15
16 #include "qemu/osdep.h"
17 #include "trace.h"
18 #include "hw/s390x/s390-pci-bus.h"
19 #include "hw/s390x/s390-pci-clp.h"
20 #include "hw/s390x/s390-pci-vfio.h"
21 #include "hw/vfio/pci.h"
22 #include "hw/vfio/vfio-common.h"
23
24 /*
25 * Get the current DMA available count from vfio. Returns true if vfio is
26 * limiting DMA requests, false otherwise. The current available count read
27 * from vfio is returned in avail.
28 */
29 bool s390_pci_update_dma_avail(int fd, unsigned int *avail)
30 {
31 g_autofree struct vfio_iommu_type1_info *info;
32 uint32_t argsz;
33
34 assert(avail);
35
36 argsz = sizeof(struct vfio_iommu_type1_info);
37 info = g_malloc0(argsz);
38
39 /*
40 * If the specified argsz is not large enough to contain all capabilities
41 * it will be updated upon return from the ioctl. Retry until we have
42 * a big enough buffer to hold the entire capability chain.
43 */
44 retry:
45 info->argsz = argsz;
46
47 if (ioctl(fd, VFIO_IOMMU_GET_INFO, info)) {
48 return false;
49 }
50
51 if (info->argsz > argsz) {
52 argsz = info->argsz;
53 info = g_realloc(info, argsz);
54 goto retry;
55 }
56
57 /* If the capability exists, update with the current value */
58 return vfio_get_info_dma_avail(info, avail);
59 }
60
61 S390PCIDMACount *s390_pci_start_dma_count(S390pciState *s,
62 S390PCIBusDevice *pbdev)
63 {
64 S390PCIDMACount *cnt;
65 uint32_t avail;
66 VFIOPCIDevice *vpdev = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
67 int id;
68
69 assert(vpdev);
70
71 id = vpdev->vbasedev.group->container->fd;
72
73 if (!s390_pci_update_dma_avail(id, &avail)) {
74 return NULL;
75 }
76
77 QTAILQ_FOREACH(cnt, &s->zpci_dma_limit, link) {
78 if (cnt->id == id) {
79 cnt->users++;
80 return cnt;
81 }
82 }
83
84 cnt = g_new0(S390PCIDMACount, 1);
85 cnt->id = id;
86 cnt->users = 1;
87 cnt->avail = avail;
88 QTAILQ_INSERT_TAIL(&s->zpci_dma_limit, cnt, link);
89 return cnt;
90 }
91
92 void s390_pci_end_dma_count(S390pciState *s, S390PCIDMACount *cnt)
93 {
94 assert(cnt);
95
96 cnt->users--;
97 if (cnt->users == 0) {
98 QTAILQ_REMOVE(&s->zpci_dma_limit, cnt, link);
99 }
100 }
101
102 static void s390_pci_read_base(S390PCIBusDevice *pbdev,
103 struct vfio_device_info *info)
104 {
105 struct vfio_info_cap_header *hdr;
106 struct vfio_device_info_cap_zpci_base *cap;
107 VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
108
109 hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_BASE);
110
111 /* If capability not provided, just leave the defaults in place */
112 if (hdr == NULL) {
113 trace_s390_pci_clp_cap(vpci->vbasedev.name,
114 VFIO_DEVICE_INFO_CAP_ZPCI_BASE);
115 return;
116 }
117 cap = (void *) hdr;
118
119 pbdev->zpci_fn.sdma = cap->start_dma;
120 pbdev->zpci_fn.edma = cap->end_dma;
121 pbdev->zpci_fn.pchid = cap->pchid;
122 pbdev->zpci_fn.vfn = cap->vfn;
123 pbdev->zpci_fn.pfgid = cap->gid;
124 /* The following values remain 0 until we support other FMB formats */
125 pbdev->zpci_fn.fmbl = 0;
126 pbdev->zpci_fn.pft = 0;
127 }
128
129 static void s390_pci_read_group(S390PCIBusDevice *pbdev,
130 struct vfio_device_info *info)
131 {
132 struct vfio_info_cap_header *hdr;
133 struct vfio_device_info_cap_zpci_group *cap;
134 ClpRspQueryPciGrp *resgrp;
135 VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
136
137 hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
138
139 /* If capability not provided, just use the default group */
140 if (hdr == NULL) {
141 trace_s390_pci_clp_cap(vpci->vbasedev.name,
142 VFIO_DEVICE_INFO_CAP_ZPCI_GROUP);
143 pbdev->zpci_fn.pfgid = ZPCI_DEFAULT_FN_GRP;
144 pbdev->pci_group = s390_group_find(ZPCI_DEFAULT_FN_GRP);
145 return;
146 }
147 cap = (void *) hdr;
148
149 /* See if the PCI group is already defined, create if not */
150 pbdev->pci_group = s390_group_find(pbdev->zpci_fn.pfgid);
151
152 if (!pbdev->pci_group) {
153 pbdev->pci_group = s390_group_create(pbdev->zpci_fn.pfgid);
154
155 resgrp = &pbdev->pci_group->zpci_group;
156 if (cap->flags & VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH) {
157 resgrp->fr = 1;
158 }
159 resgrp->dasm = cap->dasm;
160 resgrp->msia = cap->msi_addr;
161 resgrp->mui = cap->mui;
162 resgrp->i = cap->noi;
163 resgrp->maxstbl = cap->maxstbl;
164 resgrp->version = cap->version;
165 }
166 }
167
168 static void s390_pci_read_util(S390PCIBusDevice *pbdev,
169 struct vfio_device_info *info)
170 {
171 struct vfio_info_cap_header *hdr;
172 struct vfio_device_info_cap_zpci_util *cap;
173 VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
174
175 hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_UTIL);
176
177 /* If capability not provided, just leave the defaults in place */
178 if (hdr == NULL) {
179 trace_s390_pci_clp_cap(vpci->vbasedev.name,
180 VFIO_DEVICE_INFO_CAP_ZPCI_UTIL);
181 return;
182 }
183 cap = (void *) hdr;
184
185 if (cap->size > CLP_UTIL_STR_LEN) {
186 trace_s390_pci_clp_cap_size(vpci->vbasedev.name, cap->size,
187 VFIO_DEVICE_INFO_CAP_ZPCI_UTIL);
188 return;
189 }
190
191 pbdev->zpci_fn.flags |= CLP_RSP_QPCI_MASK_UTIL;
192 memcpy(pbdev->zpci_fn.util_str, cap->util_str, CLP_UTIL_STR_LEN);
193 }
194
195 static void s390_pci_read_pfip(S390PCIBusDevice *pbdev,
196 struct vfio_device_info *info)
197 {
198 struct vfio_info_cap_header *hdr;
199 struct vfio_device_info_cap_zpci_pfip *cap;
200 VFIOPCIDevice *vpci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
201
202 hdr = vfio_get_device_info_cap(info, VFIO_DEVICE_INFO_CAP_ZPCI_PFIP);
203
204 /* If capability not provided, just leave the defaults in place */
205 if (hdr == NULL) {
206 trace_s390_pci_clp_cap(vpci->vbasedev.name,
207 VFIO_DEVICE_INFO_CAP_ZPCI_PFIP);
208 return;
209 }
210 cap = (void *) hdr;
211
212 if (cap->size > CLP_PFIP_NR_SEGMENTS) {
213 trace_s390_pci_clp_cap_size(vpci->vbasedev.name, cap->size,
214 VFIO_DEVICE_INFO_CAP_ZPCI_PFIP);
215 return;
216 }
217
218 memcpy(pbdev->zpci_fn.pfip, cap->pfip, CLP_PFIP_NR_SEGMENTS);
219 }
220
221 /*
222 * This function will issue the VFIO_DEVICE_GET_INFO ioctl and look for
223 * capabilities that contain information about CLP features provided by the
224 * underlying host.
225 * On entry, defaults have already been placed into the guest CLP response
226 * buffers. On exit, defaults will have been overwritten for any CLP features
227 * found in the capability chain; defaults will remain for any CLP features not
228 * found in the chain.
229 */
230 void s390_pci_get_clp_info(S390PCIBusDevice *pbdev)
231 {
232 g_autofree struct vfio_device_info *info;
233 VFIOPCIDevice *vfio_pci;
234 uint32_t argsz;
235 int fd;
236
237 argsz = sizeof(*info);
238 info = g_malloc0(argsz);
239
240 vfio_pci = container_of(pbdev->pdev, VFIOPCIDevice, pdev);
241 fd = vfio_pci->vbasedev.fd;
242
243 /*
244 * If the specified argsz is not large enough to contain all capabilities
245 * it will be updated upon return from the ioctl. Retry until we have
246 * a big enough buffer to hold the entire capability chain. On error,
247 * just exit and rely on CLP defaults.
248 */
249 retry:
250 info->argsz = argsz;
251
252 if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
253 trace_s390_pci_clp_dev_info(vfio_pci->vbasedev.name);
254 return;
255 }
256
257 if (info->argsz > argsz) {
258 argsz = info->argsz;
259 info = g_realloc(info, argsz);
260 goto retry;
261 }
262
263 /*
264 * Find the CLP features provided and fill in the guest CLP responses.
265 * Always call s390_pci_read_base first as information from this could
266 * determine which function group is used in s390_pci_read_group.
267 * For any feature not found, the default values will remain in the CLP
268 * response.
269 */
270 s390_pci_read_base(pbdev, info);
271 s390_pci_read_group(pbdev, info);
272 s390_pci_read_util(pbdev, info);
273 s390_pci_read_pfip(pbdev, info);
274
275 return;
276 }