1
2
3
4
5
6
7
8
9
10
11#include "libc.h"
12#include "s390-ccw.h"
13#include "virtio.h"
14#include "virtio-scsi.h"
15
16static int virtio_blk_read_many(VDev *vdev, ulong sector, void *load_addr,
17 int sec_num)
18{
19 VirtioBlkOuthdr out_hdr;
20 u8 status;
21 VRing *vr = &vdev->vrings[vdev->cmd_vr_idx];
22
23
24 out_hdr.type = VIRTIO_BLK_T_IN;
25 out_hdr.ioprio = 99;
26 out_hdr.sector = virtio_sector_adjust(sector);
27
28 vring_send_buf(vr, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT);
29
30
31 vring_send_buf(vr, load_addr, virtio_get_block_size() * sec_num,
32 VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN |
33 VRING_DESC_F_NEXT);
34
35
36 vring_send_buf(vr, &status, sizeof(u8),
37 VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN);
38
39
40 vring_wait_reply();
41
42 if (drain_irqs(vr->schid)) {
43
44 status = 1;
45 }
46 return status;
47}
48
49int virtio_read_many(ulong sector, void *load_addr, int sec_num)
50{
51 VDev *vdev = virtio_get_device();
52
53 switch (vdev->senseid.cu_model) {
54 case VIRTIO_ID_BLOCK:
55 return virtio_blk_read_many(vdev, sector, load_addr, sec_num);
56 case VIRTIO_ID_SCSI:
57 return virtio_scsi_read_many(vdev, sector, load_addr, sec_num);
58 }
59 panic("\n! No readable IPL device !\n");
60 return -1;
61}
62
63unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2,
64 ulong subchan_id, void *load_addr)
65{
66 u8 status;
67 int sec = rec_list1;
68 int sec_num = ((rec_list2 >> 32) & 0xffff) + 1;
69 int sec_len = rec_list2 >> 48;
70 ulong addr = (ulong)load_addr;
71
72 if (sec_len != virtio_get_block_size()) {
73 return -1;
74 }
75
76 sclp_print(".");
77 status = virtio_read_many(sec, (void *)addr, sec_num);
78 if (status) {
79 panic("I/O Error");
80 }
81 addr += sec_num * virtio_get_block_size();
82
83 return addr;
84}
85
86int virtio_read(ulong sector, void *load_addr)
87{
88 return virtio_read_many(sector, load_addr, 1);
89}
90
91
92
93
94
95static inline u8 virtio_eckd_sectors_for_block_size(int size)
96{
97 switch (size) {
98 case 512:
99 return 49;
100 case 1024:
101 return 33;
102 case 2048:
103 return 21;
104 case 4096:
105 return 12;
106 }
107 return 0;
108}
109
110VirtioGDN virtio_guessed_disk_nature(void)
111{
112 return virtio_get_device()->guessed_disk_nature;
113}
114
115void virtio_assume_scsi(void)
116{
117 VDev *vdev = virtio_get_device();
118
119 switch (vdev->senseid.cu_model) {
120 case VIRTIO_ID_BLOCK:
121 vdev->guessed_disk_nature = VIRTIO_GDN_SCSI;
122 vdev->config.blk.blk_size = VIRTIO_SCSI_BLOCK_SIZE;
123 vdev->config.blk.physical_block_exp = 0;
124 vdev->blk_factor = 1;
125 break;
126 case VIRTIO_ID_SCSI:
127 vdev->scsi_block_size = VIRTIO_SCSI_BLOCK_SIZE;
128 break;
129 }
130}
131
132void virtio_assume_iso9660(void)
133{
134 VDev *vdev = virtio_get_device();
135
136 switch (vdev->senseid.cu_model) {
137 case VIRTIO_ID_BLOCK:
138 vdev->guessed_disk_nature = VIRTIO_GDN_SCSI;
139 vdev->config.blk.blk_size = VIRTIO_ISO_BLOCK_SIZE;
140 vdev->config.blk.physical_block_exp = 0;
141 vdev->blk_factor = VIRTIO_ISO_BLOCK_SIZE / VIRTIO_SECTOR_SIZE;
142 break;
143 case VIRTIO_ID_SCSI:
144 vdev->scsi_block_size = VIRTIO_ISO_BLOCK_SIZE;
145 break;
146 }
147}
148
149void virtio_assume_eckd(void)
150{
151 VDev *vdev = virtio_get_device();
152
153 vdev->guessed_disk_nature = VIRTIO_GDN_DASD;
154 vdev->blk_factor = 1;
155 vdev->config.blk.physical_block_exp = 0;
156 switch (vdev->senseid.cu_model) {
157 case VIRTIO_ID_BLOCK:
158 vdev->config.blk.blk_size = 4096;
159 break;
160 case VIRTIO_ID_SCSI:
161 vdev->config.blk.blk_size = vdev->scsi_block_size;
162 break;
163 }
164 vdev->config.blk.geometry.heads = 15;
165 vdev->config.blk.geometry.sectors =
166 virtio_eckd_sectors_for_block_size(vdev->config.blk.blk_size);
167}
168
169bool virtio_disk_is_scsi(void)
170{
171 VDev *vdev = virtio_get_device();
172
173 if (vdev->guessed_disk_nature == VIRTIO_GDN_SCSI) {
174 return true;
175 }
176 switch (vdev->senseid.cu_model) {
177 case VIRTIO_ID_BLOCK:
178 return (vdev->config.blk.geometry.heads == 255)
179 && (vdev->config.blk.geometry.sectors == 63)
180 && (virtio_get_block_size() == VIRTIO_SCSI_BLOCK_SIZE);
181 case VIRTIO_ID_SCSI:
182 return true;
183 }
184 return false;
185}
186
187bool virtio_disk_is_eckd(void)
188{
189 VDev *vdev = virtio_get_device();
190 const int block_size = virtio_get_block_size();
191
192 if (vdev->guessed_disk_nature == VIRTIO_GDN_DASD) {
193 return true;
194 }
195 switch (vdev->senseid.cu_model) {
196 case VIRTIO_ID_BLOCK:
197 return (vdev->config.blk.geometry.heads == 15)
198 && (vdev->config.blk.geometry.sectors ==
199 virtio_eckd_sectors_for_block_size(block_size));
200 case VIRTIO_ID_SCSI:
201 return false;
202 }
203 return false;
204}
205
206bool virtio_ipl_disk_is_valid(void)
207{
208 return virtio_disk_is_scsi() || virtio_disk_is_eckd();
209}
210
211int virtio_get_block_size(void)
212{
213 VDev *vdev = virtio_get_device();
214
215 switch (vdev->senseid.cu_model) {
216 case VIRTIO_ID_BLOCK:
217 return vdev->config.blk.blk_size << vdev->config.blk.physical_block_exp;
218 case VIRTIO_ID_SCSI:
219 return vdev->scsi_block_size;
220 }
221 return 0;
222}
223
224uint8_t virtio_get_heads(void)
225{
226 VDev *vdev = virtio_get_device();
227
228 switch (vdev->senseid.cu_model) {
229 case VIRTIO_ID_BLOCK:
230 return vdev->config.blk.geometry.heads;
231 case VIRTIO_ID_SCSI:
232 return vdev->guessed_disk_nature == VIRTIO_GDN_DASD
233 ? vdev->config.blk.geometry.heads : 255;
234 }
235 return 0;
236}
237
238uint8_t virtio_get_sectors(void)
239{
240 VDev *vdev = virtio_get_device();
241
242 switch (vdev->senseid.cu_model) {
243 case VIRTIO_ID_BLOCK:
244 return vdev->config.blk.geometry.sectors;
245 case VIRTIO_ID_SCSI:
246 return vdev->guessed_disk_nature == VIRTIO_GDN_DASD
247 ? vdev->config.blk.geometry.sectors : 63;
248 }
249 return 0;
250}
251
252uint64_t virtio_get_blocks(void)
253{
254 VDev *vdev = virtio_get_device();
255 const uint64_t factor = virtio_get_block_size() / VIRTIO_SECTOR_SIZE;
256
257 switch (vdev->senseid.cu_model) {
258 case VIRTIO_ID_BLOCK:
259 return vdev->config.blk.capacity / factor;
260 case VIRTIO_ID_SCSI:
261 return vdev->scsi_last_block / factor;
262 }
263 return 0;
264}
265
266void virtio_blk_setup_device(SubChannelId schid)
267{
268 VDev *vdev = virtio_get_device();
269
270 vdev->schid = schid;
271 virtio_setup_ccw(vdev);
272
273 switch (vdev->senseid.cu_model) {
274 case VIRTIO_ID_BLOCK:
275 sclp_print("Using virtio-blk.\n");
276 if (!virtio_ipl_disk_is_valid()) {
277
278
279
280 memset(&vdev->config.blk, 0, sizeof(vdev->config.blk));
281 virtio_assume_scsi();
282 }
283 break;
284 case VIRTIO_ID_SCSI:
285 IPL_assert(vdev->config.scsi.sense_size == VIRTIO_SCSI_SENSE_SIZE,
286 "Config: sense size mismatch");
287 IPL_assert(vdev->config.scsi.cdb_size == VIRTIO_SCSI_CDB_SIZE,
288 "Config: CDB size mismatch");
289
290 sclp_print("Using virtio-scsi.\n");
291 virtio_scsi_setup(vdev);
292 break;
293 default:
294 panic("\n! No IPL device available !\n");
295 }
296}
297
