| 1238 | } |
| 1239 | |
| 1240 | static int |
| 1241 | alloc_bounce_zone(bus_dma_tag_t dmat) |
| 1242 | { |
| 1243 | struct bounce_zone *bz; |
| 1244 | |
| 1245 | /* Check to see if we already have a suitable zone */ |
| 1246 | STAILQ_FOREACH(bz, &bounce_zone_list, links) { |
| 1247 | if ((dmat->common.alignment <= bz->alignment) && |
| 1248 | (dmat->common.lowaddr >= bz->lowaddr)) { |
| 1249 | dmat->bounce_zone = bz; |
| 1250 | return (0); |
| 1251 | } |
| 1252 | } |
| 1253 | |
| 1254 | if ((bz = (struct bounce_zone *)malloc(sizeof(*bz), M_DEVBUF, |
| 1255 | M_NOWAIT | M_ZERO)) == NULL) |
| 1256 | return (ENOMEM); |
| 1257 | |
| 1258 | STAILQ_INIT(&bz->bounce_page_list); |
| 1259 | bz->free_bpages = 0; |
| 1260 | bz->reserved_bpages = 0; |
| 1261 | bz->active_bpages = 0; |
| 1262 | bz->lowaddr = dmat->common.lowaddr; |
| 1263 | bz->alignment = MAX(dmat->common.alignment, PAGE_SIZE); |
| 1264 | bz->map_count = 0; |
| 1265 | snprintf(bz->zoneid, 8, "zone%d", busdma_zonecount); |
| 1266 | busdma_zonecount++; |
| 1267 | snprintf(bz->lowaddrid, 18, "%#jx", (uintmax_t)bz->lowaddr); |
| 1268 | STAILQ_INSERT_TAIL(&bounce_zone_list, bz, links); |
| 1269 | dmat->bounce_zone = bz; |
| 1270 | |
| 1271 | sysctl_ctx_init(&bz->sysctl_tree); |
| 1272 | bz->sysctl_tree_top = SYSCTL_ADD_NODE(&bz->sysctl_tree, |
| 1273 | SYSCTL_STATIC_CHILDREN(_hw_busdma), OID_AUTO, bz->zoneid, |
| 1274 | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); |
| 1275 | if (bz->sysctl_tree_top == NULL) { |
| 1276 | sysctl_ctx_free(&bz->sysctl_tree); |
| 1277 | return (0); /* XXX error code? */ |
| 1278 | } |
| 1279 | |
| 1280 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1281 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1282 | "total_bpages", CTLFLAG_RD, &bz->total_bpages, 0, |
| 1283 | "Total bounce pages"); |
| 1284 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1285 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1286 | "free_bpages", CTLFLAG_RD, &bz->free_bpages, 0, |
| 1287 | "Free bounce pages"); |
| 1288 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1289 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1290 | "reserved_bpages", CTLFLAG_RD, &bz->reserved_bpages, 0, |
| 1291 | "Reserved bounce pages"); |
| 1292 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1293 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
| 1294 | "active_bpages", CTLFLAG_RD, &bz->active_bpages, 0, |
| 1295 | "Active bounce pages"); |
| 1296 | SYSCTL_ADD_INT(busdma_sysctl_tree(bz), |
| 1297 | SYSCTL_CHILDREN(busdma_sysctl_tree_top(bz)), OID_AUTO, |
no test coverage detected