1 /* 2 * libqos virtio driver 3 * 4 * Copyright (c) 2014 Marc Marí 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 */ 9 10 #include <glib.h> 11 #include "libqtest.h" 12 #include "libqos/virtio.h" 13 14 uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d, 15 void *addr) 16 { 17 return bus->config_readb(d, addr); 18 } 19 20 uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d, 21 void *addr) 22 { 23 return bus->config_readw(d, addr); 24 } 25 26 uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d, 27 void *addr) 28 { 29 return bus->config_readl(d, addr); 30 } 31 32 uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d, 33 void *addr) 34 { 35 return bus->config_readq(d, addr); 36 } 37 38 uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d) 39 { 40 return bus->get_features(d); 41 } 42 43 void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d, 44 uint32_t features) 45 { 46 bus->set_features(d, features); 47 } 48 49 QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d, 50 QGuestAllocator *alloc, uint16_t index) 51 { 52 return bus->virtqueue_setup(d, alloc, index); 53 } 54 55 void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d) 56 { 57 bus->set_status(d, QVIRTIO_RESET); 58 g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_RESET); 59 } 60 61 void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d) 62 { 63 bus->set_status(d, bus->get_status(d) | QVIRTIO_ACKNOWLEDGE); 64 g_assert_cmphex(bus->get_status(d), ==, QVIRTIO_ACKNOWLEDGE); 65 } 66 67 void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d) 68 { 69 bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER); 70 g_assert_cmphex(bus->get_status(d), ==, 71 QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE); 72 } 73 74 void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d) 75 { 76 bus->set_status(d, bus->get_status(d) | QVIRTIO_DRIVER_OK); 77 g_assert_cmphex(bus->get_status(d), ==, 78 QVIRTIO_DRIVER_OK | QVIRTIO_DRIVER | QVIRTIO_ACKNOWLEDGE); 79 } 80 81 bool qvirtio_wait_queue_isr(const QVirtioBus *bus, QVirtioDevice *d, 82 QVirtQueue *vq, uint64_t timeout) 83 { 84 do { 85 clock_step(100); 86 if (bus->get_queue_isr_status(d, vq)) { 87 break; /* It has ended */ 88 } 89 } while (--timeout); 90 91 return timeout != 0; 92 } 93 94 bool qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d, 95 uint64_t timeout) 96 { 97 do { 98 clock_step(100); 99 if (bus->get_config_isr_status(d)) { 100 break; /* It has ended */ 101 } 102 } while (--timeout); 103 104 return timeout != 0; 105 } 106 107 void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr) 108 { 109 int i; 110 111 vq->desc = addr; 112 vq->avail = vq->desc + vq->size*sizeof(QVRingDesc); 113 vq->used = (uint64_t)((vq->avail + sizeof(uint16_t) * (3 + vq->size) 114 + vq->align - 1) & ~(vq->align - 1)); 115 116 for (i = 0; i < vq->size - 1; i++) { 117 /* vq->desc[i].addr */ 118 writew(vq->desc + (16 * i), 0); 119 /* vq->desc[i].next */ 120 writew(vq->desc + (16 * i) + 14, i + 1); 121 } 122 123 /* vq->avail->flags */ 124 writew(vq->avail, 0); 125 /* vq->avail->idx */ 126 writew(vq->avail + 2, 0); 127 /* vq->avail->used_event */ 128 writew(vq->avail + 4 + (2 * vq->size), 0); 129 130 /* vq->used->flags */ 131 writew(vq->used, 0); 132 /* vq->used->avail_event */ 133 writew(vq->used+2+(sizeof(struct QVRingUsedElem)*vq->size), 0); 134 } 135 136 QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d, 137 QGuestAllocator *alloc, uint16_t elem) 138 { 139 int i; 140 QVRingIndirectDesc *indirect = g_malloc(sizeof(*indirect)); 141 142 indirect->index = 0; 143 indirect->elem = elem; 144 indirect->desc = guest_alloc(alloc, sizeof(QVRingDesc)*elem); 145 146 for (i = 0; i < elem - 1; ++i) { 147 /* indirect->desc[i].addr */ 148 writeq(indirect->desc + (16 * i), 0); 149 /* indirect->desc[i].flags */ 150 writew(indirect->desc + (16 * i) + 12, QVRING_DESC_F_NEXT); 151 /* indirect->desc[i].next */ 152 writew(indirect->desc + (16 * i) + 14, i + 1); 153 } 154 155 return indirect; 156 } 157 158 void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data, 159 uint32_t len, bool write) 160 { 161 uint16_t flags; 162 163 g_assert_cmpint(indirect->index, <, indirect->elem); 164 165 flags = readw(indirect->desc + (16 * indirect->index) + 12); 166 167 if (write) { 168 flags |= QVRING_DESC_F_WRITE; 169 } 170 171 /* indirect->desc[indirect->index].addr */ 172 writeq(indirect->desc + (16 * indirect->index), data); 173 /* indirect->desc[indirect->index].len */ 174 writel(indirect->desc + (16 * indirect->index) + 8, len); 175 /* indirect->desc[indirect->index].flags */ 176 writew(indirect->desc + (16 * indirect->index) + 12, flags); 177 178 indirect->index++; 179 } 180 181 uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write, 182 bool next) 183 { 184 uint16_t flags = 0; 185 vq->num_free--; 186 187 if (write) { 188 flags |= QVRING_DESC_F_WRITE; 189 } 190 191 if (next) { 192 flags |= QVRING_DESC_F_NEXT; 193 } 194 195 /* vq->desc[vq->free_head].addr */ 196 writeq(vq->desc + (16 * vq->free_head), data); 197 /* vq->desc[vq->free_head].len */ 198 writel(vq->desc + (16 * vq->free_head) + 8, len); 199 /* vq->desc[vq->free_head].flags */ 200 writew(vq->desc + (16 * vq->free_head) + 12, flags); 201 202 return vq->free_head++; /* Return and increase, in this order */ 203 } 204 205 uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect) 206 { 207 g_assert(vq->indirect); 208 g_assert_cmpint(vq->size, >=, indirect->elem); 209 g_assert_cmpint(indirect->index, ==, indirect->elem); 210 211 vq->num_free--; 212 213 /* vq->desc[vq->free_head].addr */ 214 writeq(vq->desc + (16 * vq->free_head), indirect->desc); 215 /* vq->desc[vq->free_head].len */ 216 writel(vq->desc + (16 * vq->free_head) + 8, 217 sizeof(QVRingDesc) * indirect->elem); 218 /* vq->desc[vq->free_head].flags */ 219 writew(vq->desc + (16 * vq->free_head) + 12, QVRING_DESC_F_INDIRECT); 220 221 return vq->free_head++; /* Return and increase, in this order */ 222 } 223 224 void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq, 225 uint32_t free_head) 226 { 227 /* vq->avail->idx */ 228 uint16_t idx = readl(vq->avail + 2); 229 /* vq->used->flags */ 230 uint16_t flags; 231 /* vq->used->avail_event */ 232 uint16_t avail_event; 233 234 /* vq->avail->ring[idx % vq->size] */ 235 writel(vq->avail + 4 + (2 * (idx % vq->size)), free_head); 236 /* vq->avail->idx */ 237 writel(vq->avail + 2, idx + 1); 238 239 /* Must read after idx is updated */ 240 flags = readw(vq->avail); 241 avail_event = readw(vq->used + 4 + 242 (sizeof(struct QVRingUsedElem) * vq->size)); 243 244 /* < 1 because we add elements to avail queue one by one */ 245 if ((flags & QVRING_USED_F_NO_NOTIFY) == 0 && 246 (!vq->event || (uint16_t)(idx-avail_event) < 1)) { 247 bus->virtqueue_kick(d, vq); 248 } 249 } 250 251 void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx) 252 { 253 g_assert(vq->event); 254 255 /* vq->avail->used_event */ 256 writew(vq->avail + 4 + (2 * vq->size), idx); 257 } 258