1 /* 2 * Channel subsystem structures and definitions. 3 * 4 * Copyright 2012 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.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 #ifndef CSS_H 13 #define CSS_H 14 15 #include "cpu.h" 16 #include "hw/s390x/adapter.h" 17 #include "hw/s390x/s390_flic.h" 18 #include "hw/s390x/ioinst.h" 19 #include "sysemu/kvm.h" 20 21 /* Channel subsystem constants. */ 22 #define MAX_DEVNO 65535 23 #define MAX_SCHID 65535 24 #define MAX_SSID 3 25 #define MAX_CSSID 255 26 #define MAX_CHPID 255 27 28 #define MAX_ISC 7 29 30 #define MAX_CIWS 62 31 32 #define VIRTUAL_CSSID 0xfe 33 #define VIRTIO_CCW_CHPID 0 /* used by convention */ 34 35 typedef struct CIW { 36 uint8_t type; 37 uint8_t command; 38 uint16_t count; 39 } QEMU_PACKED CIW; 40 41 typedef struct SenseId { 42 /* common part */ 43 uint8_t reserved; /* always 0x'FF' */ 44 uint16_t cu_type; /* control unit type */ 45 uint8_t cu_model; /* control unit model */ 46 uint16_t dev_type; /* device type */ 47 uint8_t dev_model; /* device model */ 48 uint8_t unused; /* padding byte */ 49 /* extended part */ 50 CIW ciw[MAX_CIWS]; /* variable # of CIWs */ 51 } SenseId; /* Note: No QEMU_PACKED due to unaligned members */ 52 53 /* Channel measurements, from linux/drivers/s390/cio/cmf.c. */ 54 typedef struct CMB { 55 uint16_t ssch_rsch_count; 56 uint16_t sample_count; 57 uint32_t device_connect_time; 58 uint32_t function_pending_time; 59 uint32_t device_disconnect_time; 60 uint32_t control_unit_queuing_time; 61 uint32_t device_active_only_time; 62 uint32_t reserved[2]; 63 } QEMU_PACKED CMB; 64 65 typedef struct CMBE { 66 uint32_t ssch_rsch_count; 67 uint32_t sample_count; 68 uint32_t device_connect_time; 69 uint32_t function_pending_time; 70 uint32_t device_disconnect_time; 71 uint32_t control_unit_queuing_time; 72 uint32_t device_active_only_time; 73 uint32_t device_busy_time; 74 uint32_t initial_command_response_time; 75 uint32_t reserved[7]; 76 } QEMU_PACKED CMBE; 77 78 typedef enum CcwDataStreamOp { 79 CDS_OP_R = 0, /* read, false when used as is_write */ 80 CDS_OP_W = 1, /* write, true when used as is_write */ 81 CDS_OP_A = 2 /* advance, should not be used as is_write */ 82 } CcwDataStreamOp; 83 84 /* normal usage is via SuchchDev.cds instead of instantiating */ 85 typedef struct CcwDataStream { 86 #define CDS_F_IDA 0x01 87 #define CDS_F_MIDA 0x02 88 #define CDS_F_I2K 0x04 89 #define CDS_F_C64 0x08 90 #define CDS_F_FMT 0x10 /* CCW format-1 */ 91 #define CDS_F_STREAM_BROKEN 0x80 92 uint8_t flags; 93 uint8_t at_idaw; 94 uint16_t at_byte; 95 uint16_t count; 96 uint32_t cda_orig; 97 int (*op_handler)(struct CcwDataStream *cds, void *buff, int len, 98 CcwDataStreamOp op); 99 hwaddr cda; 100 bool do_skip; 101 } CcwDataStream; 102 103 /* 104 * IO instructions conclude according to this. Currently we have only 105 * cc codes. Valid values are 0, 1, 2, 3 and the generic semantic for 106 * IO instructions is described briefly. For more details consult the PoP. 107 */ 108 typedef enum IOInstEnding { 109 /* produced expected result */ 110 IOINST_CC_EXPECTED = 0, 111 /* status conditions were present or produced alternate result */ 112 IOINST_CC_STATUS_PRESENT = 1, 113 /* inst. ineffective because busy with previously initiated function */ 114 IOINST_CC_BUSY = 2, 115 /* inst. ineffective because not operational */ 116 IOINST_CC_NOT_OPERATIONAL = 3 117 } IOInstEnding; 118 119 typedef struct SubchDev SubchDev; 120 struct SubchDev { 121 /* channel-subsystem related things: */ 122 SCHIB curr_status; /* Needs alignment and thus must come first */ 123 ORB orb; 124 uint8_t cssid; 125 uint8_t ssid; 126 uint16_t schid; 127 uint16_t devno; 128 uint8_t sense_data[32]; 129 hwaddr channel_prog; 130 CCW1 last_cmd; 131 bool last_cmd_valid; 132 bool ccw_fmt_1; 133 bool thinint_active; 134 uint8_t ccw_no_data_cnt; 135 uint16_t migrated_schid; /* used for missmatch detection */ 136 CcwDataStream cds; 137 /* transport-provided data: */ 138 int (*ccw_cb) (SubchDev *, CCW1); 139 void (*disable_cb)(SubchDev *); 140 IOInstEnding (*do_subchannel_work) (SubchDev *); 141 SenseId id; 142 void *driver_data; 143 }; 144 145 static inline void sch_gen_unit_exception(SubchDev *sch) 146 { 147 sch->curr_status.scsw.ctrl &= ~SCSW_ACTL_START_PEND; 148 sch->curr_status.scsw.ctrl |= SCSW_STCTL_PRIMARY | 149 SCSW_STCTL_SECONDARY | 150 SCSW_STCTL_ALERT | 151 SCSW_STCTL_STATUS_PEND; 152 sch->curr_status.scsw.cpa = sch->channel_prog + 8; 153 sch->curr_status.scsw.dstat = SCSW_DSTAT_UNIT_EXCEP; 154 } 155 156 extern const VMStateDescription vmstate_subch_dev; 157 158 /* 159 * Identify a device within the channel subsystem. 160 * Note that this can be used to identify either the subchannel or 161 * the attached I/O device, as there's always one I/O device per 162 * subchannel. 163 */ 164 typedef struct CssDevId { 165 uint8_t cssid; 166 uint8_t ssid; 167 uint16_t devid; 168 bool valid; 169 } CssDevId; 170 171 extern const PropertyInfo css_devid_propinfo; 172 173 #define DEFINE_PROP_CSS_DEV_ID(_n, _s, _f) \ 174 DEFINE_PROP(_n, _s, _f, css_devid_propinfo, CssDevId) 175 176 typedef struct IndAddr { 177 hwaddr addr; 178 uint64_t map; 179 unsigned long refcnt; 180 int32_t len; 181 QTAILQ_ENTRY(IndAddr) sibling; 182 } IndAddr; 183 184 extern const VMStateDescription vmstate_ind_addr; 185 186 #define VMSTATE_PTR_TO_IND_ADDR(_f, _s) \ 187 VMSTATE_STRUCT(_f, _s, 1, vmstate_ind_addr, IndAddr*) 188 189 IndAddr *get_indicator(hwaddr ind_addr, int len); 190 void release_indicator(AdapterInfo *adapter, IndAddr *indicator); 191 int map_indicator(AdapterInfo *adapter, IndAddr *indicator); 192 193 typedef SubchDev *(*css_subch_cb_func)(uint8_t m, uint8_t cssid, uint8_t ssid, 194 uint16_t schid); 195 int css_create_css_image(uint8_t cssid, bool default_image); 196 bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno); 197 void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid, 198 uint16_t devno, SubchDev *sch); 199 void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type); 200 int css_sch_build_schib(SubchDev *sch, CssDevId *dev_id); 201 unsigned int css_find_free_chpid(uint8_t cssid); 202 uint16_t css_build_subchannel_id(SubchDev *sch); 203 void copy_scsw_to_guest(SCSW *dest, const SCSW *src); 204 void css_inject_io_interrupt(SubchDev *sch); 205 void css_reset(void); 206 void css_reset_sch(SubchDev *sch); 207 void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited, 208 int chain, uint16_t rsid); 209 void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid, 210 int hotplugged, int add); 211 void css_generate_chp_crws(uint8_t cssid, uint8_t chpid); 212 void css_generate_css_crws(uint8_t cssid); 213 void css_clear_sei_pending(void); 214 IOInstEnding s390_ccw_cmd_request(SubchDev *sch); 215 IOInstEnding do_subchannel_work_virtual(SubchDev *sub); 216 IOInstEnding do_subchannel_work_passthrough(SubchDev *sub); 217 218 typedef enum { 219 CSS_IO_ADAPTER_VIRTIO = 0, 220 CSS_IO_ADAPTER_PCI = 1, 221 CSS_IO_ADAPTER_TYPE_NUMS, 222 } CssIoAdapterType; 223 224 void css_adapter_interrupt(CssIoAdapterType type, uint8_t isc); 225 int css_do_sic(CPUS390XState *env, uint8_t isc, uint16_t mode); 226 uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc); 227 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable, 228 uint8_t flags, Error **errp); 229 230 #ifndef CONFIG_KVM 231 #define S390_ADAPTER_SUPPRESSIBLE 0x01 232 #else 233 #define S390_ADAPTER_SUPPRESSIBLE KVM_S390_ADAPTER_SUPPRESSIBLE 234 #endif 235 236 #ifndef CONFIG_USER_ONLY 237 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid, 238 uint16_t schid); 239 bool css_subch_visible(SubchDev *sch); 240 void css_conditional_io_interrupt(SubchDev *sch); 241 int css_do_stsch(SubchDev *sch, SCHIB *schib); 242 bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid); 243 IOInstEnding css_do_msch(SubchDev *sch, const SCHIB *schib); 244 IOInstEnding css_do_xsch(SubchDev *sch); 245 IOInstEnding css_do_csch(SubchDev *sch); 246 IOInstEnding css_do_hsch(SubchDev *sch); 247 IOInstEnding css_do_ssch(SubchDev *sch, ORB *orb); 248 int css_do_tsch_get_irb(SubchDev *sch, IRB *irb, int *irb_len); 249 void css_do_tsch_update_subch(SubchDev *sch); 250 int css_do_stcrw(CRW *crw); 251 void css_undo_stcrw(CRW *crw); 252 int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid, 253 int rfmt, void *buf); 254 void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo); 255 int css_enable_mcsse(void); 256 int css_enable_mss(void); 257 IOInstEnding css_do_rsch(SubchDev *sch); 258 int css_do_rchp(uint8_t cssid, uint8_t chpid); 259 bool css_present(uint8_t cssid); 260 #endif 261 262 extern const PropertyInfo css_devid_ro_propinfo; 263 264 #define DEFINE_PROP_CSS_DEV_ID_RO(_n, _s, _f) \ 265 DEFINE_PROP(_n, _s, _f, css_devid_ro_propinfo, CssDevId) 266 267 /** 268 * Create a subchannel for the given bus id. 269 * 270 * If @p bus_id is valid, verify that it is not already in use, and find a 271 * free devno for it. 272 * If @p bus_id is not valid find a free subchannel id and device number 273 * across all subchannel sets and all css images starting from the default 274 * css image. 275 * 276 * If either of the former actions succeed, allocate a subchannel structure, 277 * initialise it with the bus id, subchannel id and device number, register 278 * it with the CSS and return it. Otherwise return NULL. 279 * 280 * The caller becomes owner of the returned subchannel structure and 281 * is responsible for unregistering and freeing it. 282 */ 283 SubchDev *css_create_sch(CssDevId bus_id, Error **errp); 284 285 /** Turn on css migration */ 286 void css_register_vmstate(void); 287 288 289 void ccw_dstream_init(CcwDataStream *cds, CCW1 const *ccw, ORB const *orb); 290 291 static inline void ccw_dstream_rewind(CcwDataStream *cds) 292 { 293 cds->at_byte = 0; 294 cds->at_idaw = 0; 295 cds->cda = cds->cda_orig; 296 } 297 298 static inline bool ccw_dstream_good(CcwDataStream *cds) 299 { 300 return !(cds->flags & CDS_F_STREAM_BROKEN); 301 } 302 303 static inline uint16_t ccw_dstream_residual_count(CcwDataStream *cds) 304 { 305 return cds->count - cds->at_byte; 306 } 307 308 static inline uint16_t ccw_dstream_avail(CcwDataStream *cds) 309 { 310 return ccw_dstream_good(cds) ? ccw_dstream_residual_count(cds) : 0; 311 } 312 313 static inline int ccw_dstream_advance(CcwDataStream *cds, int len) 314 { 315 return cds->op_handler(cds, NULL, len, CDS_OP_A); 316 } 317 318 static inline int ccw_dstream_write_buf(CcwDataStream *cds, void *buff, int len) 319 { 320 return cds->op_handler(cds, buff, len, CDS_OP_W); 321 } 322 323 static inline int ccw_dstream_read_buf(CcwDataStream *cds, void *buff, int len) 324 { 325 return cds->op_handler(cds, buff, len, CDS_OP_R); 326 } 327 328 #define ccw_dstream_read(cds, v) ccw_dstream_read_buf((cds), &(v), sizeof(v)) 329 #define ccw_dstream_write(cds, v) ccw_dstream_write_buf((cds), &(v), sizeof(v)) 330 331 #endif 332