| 1309 | } |
| 1310 | |
| 1311 | static int |
| 1312 | alloc_bounce_zone(bus_dma_tag_t dmat) |
| 1313 | { |
| 1314 | struct bounce_zone *bz; |
| 1315 | |
| 1316 | /* Check to see if we already have a suitable zone */ |
| 1317 | STAILQ_FOREACH(bz, &bounce_zone_list, links) { |
| 1318 | if ((dmat->alignment <= bz->alignment) |
| 1319 | && (dmat->lowaddr >= bz->lowaddr)) { |
| 1320 | dmat->bounce_zone = bz; |
| 1321 | return (0); |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_BUSDMA, |
| 1326 | M_NOWAIT | M_ZERO)) == NULL) |
| 1327 | return (ENOMEM); |
| 1328 | |
| 1329 | STAILQ_INIT(&bz->bounce_page_list); |
| 1330 | bz->free_bpages = 0; |
| 1331 | bz->reserved_bpages = 0; |
| 1332 | bz->active_bpages = 0; |
| 1333 | bz->lowaddr = dmat->lowaddr; |
| 1334 | bz->alignment = MAX(dmat->alignment, PAGE_SIZE); |
| 1335 | bz->map_count = 0; |
| 1336 | snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount); |
| 1337 | busdma_zonecount++; |
| 1338 | snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr); |
| 1339 | STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links); |
| 1340 | dmat->bounce_zone = bz; |
| 1341 | |
| 1342 | sysctl_ctx_init(&bz->sysctl_tree); |
| 1343 | bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree, |
| 1344 | SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid, |
| 1345 | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); |
| 1346 | if (bz->sysctl_tree_top == NULL) { |
| 1347 | sysctl_ctx_free(&bz->sysctl_tree); |
| 1348 | return (0); /* XXX error code? */ |
| 1349 | } |
| 1350 | |
| 1351 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1352 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1353 | "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0, |
| 1354 | "Total bounce pages"); |
| 1355 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1356 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1357 | "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0, |
| 1358 | "Free bounce pages"); |
| 1359 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1360 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1361 | "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0, |
| 1362 | "Reserved bounce pages"); |
| 1363 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1364 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1365 | "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0, |
| 1366 | "Active bounce pages"); |
| 1367 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1368 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
no test coverage detected