include/hw/s390x/css.h

   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 } QEMU_PACKED SenseId;
  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 } CcwDataStream;
 101
 102 /*
 103  * IO instructions conclude according to this. Currently we have only
 104  * cc codes. Valid values are 0, 1, 2, 3 and the generic semantic for
 105  * IO instructions is described briefly. For more details consult the PoP.
 106  */
 107 typedef enum IOInstEnding {
 108     /* produced expected result */
 109     IOINST_CC_EXPECTED = 0,
 110     /* status conditions were present or produced alternate result */
 111     IOINST_CC_STATUS_PRESENT = 1,
 112     /* inst. ineffective because busy with previously initiated function */
 113     IOINST_CC_BUSY = 2,
 114     /* inst. ineffective because not operational */
 115     IOINST_CC_NOT_OPERATIONAL = 3
 116 } IOInstEnding;
 117
 118 typedef struct SubchDev SubchDev;
 119 struct SubchDev {
 120     /* channel-subsystem related things: */
 121     uint8_t cssid;
 122     uint8_t ssid;
 123     uint16_t schid;
 124     uint16_t devno;
 125     SCHIB curr_status;
 126     uint8_t sense_data[32];
 127     hwaddr channel_prog;
 128     CCW1 last_cmd;
 129     bool last_cmd_valid;
 130     bool ccw_fmt_1;
 131     bool thinint_active;
 132     uint8_t ccw_no_data_cnt;
 133     uint16_t migrated_schid; /* used for missmatch detection */
 134     ORB orb;
 135     CcwDataStream cds;
 136     /* transport-provided data: */
 137     int (*ccw_cb) (SubchDev *, CCW1);
 138     void (*disable_cb)(SubchDev *);
 139     IOInstEnding (*do_subchannel_work) (SubchDev *);
 140     SenseId id;
 141     void *driver_data;
 142 };
 143
 144 static inline void sch_gen_unit_exception(SubchDev *sch)
 145 {
 146     sch->curr_status.scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 147     sch->curr_status.scsw.ctrl |= SCSW_STCTL_PRIMARY |
 148                                   SCSW_STCTL_SECONDARY |
 149                                   SCSW_STCTL_ALERT |
 150                                   SCSW_STCTL_STATUS_PEND;
 151     sch->curr_status.scsw.cpa = sch->channel_prog + 8;
 152     sch->curr_status.scsw.dstat =  SCSW_DSTAT_UNIT_EXCEP;
 153 }
 154
 155 extern const VMStateDescription vmstate_subch_dev;
 156
 157 /*
 158  * Identify a device within the channel subsystem.
 159  * Note that this can be used to identify either the subchannel or
 160  * the attached I/O device, as there's always one I/O device per
 161  * subchannel.
 162  */
 163 typedef struct CssDevId {
 164     uint8_t cssid;
 165     uint8_t ssid;
 166     uint16_t devid;
 167     bool valid;
 168 } CssDevId;
 169
 170 extern const PropertyInfo css_devid_propinfo;
 171
 172 #define DEFINE_PROP_CSS_DEV_ID(_n, _s, _f) \
 173     DEFINE_PROP(_n, _s, _f, css_devid_propinfo, CssDevId)
 174
 175 typedef struct IndAddr {
 176     hwaddr addr;
 177     uint64_t map;
 178     unsigned long refcnt;
 179     int32_t len;
 180     QTAILQ_ENTRY(IndAddr) sibling;
 181 } IndAddr;
 182
 183 extern const VMStateDescription vmstate_ind_addr;
 184
 185 #define VMSTATE_PTR_TO_IND_ADDR(_f, _s)                                   \
 186     VMSTATE_STRUCT(_f, _s, 1, vmstate_ind_addr, IndAddr*)
 187
 188 IndAddr *get_indicator(hwaddr ind_addr, int len);
 189 void release_indicator(AdapterInfo *adapter, IndAddr *indicator);
 190 int map_indicator(AdapterInfo *adapter, IndAddr *indicator);
 191
 192 typedef SubchDev *(*css_subch_cb_func)(uint8_t m, uint8_t cssid, uint8_t ssid,
 193                                        uint16_t schid);
 194 int css_create_css_image(uint8_t cssid, bool default_image);
 195 bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno);
 196 void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
 197                       uint16_t devno, SubchDev *sch);
 198 void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type);
 199 int css_sch_build_schib(SubchDev *sch, CssDevId *dev_id);
 200 unsigned int css_find_free_chpid(uint8_t cssid);
 201 uint16_t css_build_subchannel_id(SubchDev *sch);
 202 void copy_scsw_to_guest(SCSW *dest, const SCSW *src);
 203 void css_inject_io_interrupt(SubchDev *sch);
 204 void css_reset(void);
 205 void css_reset_sch(SubchDev *sch);
 206 void css_queue_crw(uint8_t rsc, uint8_t erc, int solicited,
 207                    int chain, uint16_t rsid);
 208 void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,
 209                            int hotplugged, int add);
 210 void css_generate_chp_crws(uint8_t cssid, uint8_t chpid);
 211 void css_generate_css_crws(uint8_t cssid);
 212 void css_clear_sei_pending(void);
 213 IOInstEnding s390_ccw_cmd_request(SubchDev *sch);
 214 IOInstEnding do_subchannel_work_virtual(SubchDev *sub);
 215 IOInstEnding do_subchannel_work_passthrough(SubchDev *sub);
 216
 217 typedef enum {
 218     CSS_IO_ADAPTER_VIRTIO = 0,
 219     CSS_IO_ADAPTER_PCI = 1,
 220     CSS_IO_ADAPTER_TYPE_NUMS,
 221 } CssIoAdapterType;
 222
 223 void css_adapter_interrupt(CssIoAdapterType type, uint8_t isc);
 224 int css_do_sic(CPUS390XState *env, uint8_t isc, uint16_t mode);
 225 uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc);
 226 void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable,
 227                               uint8_t flags, Error **errp);
 228
 229 #ifndef CONFIG_KVM
 230 #define S390_ADAPTER_SUPPRESSIBLE 0x01
 231 #else
 232 #define S390_ADAPTER_SUPPRESSIBLE KVM_S390_ADAPTER_SUPPRESSIBLE
 233 #endif
 234
 235 #ifndef CONFIG_USER_ONLY
 236 SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid,
 237                          uint16_t schid);
 238 bool css_subch_visible(SubchDev *sch);
 239 void css_conditional_io_interrupt(SubchDev *sch);
 240 int css_do_stsch(SubchDev *sch, SCHIB *schib);
 241 bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid);
 242 IOInstEnding css_do_msch(SubchDev *sch, const SCHIB *schib);
 243 IOInstEnding css_do_xsch(SubchDev *sch);
 244 IOInstEnding css_do_csch(SubchDev *sch);
 245 IOInstEnding css_do_hsch(SubchDev *sch);
 246 IOInstEnding css_do_ssch(SubchDev *sch, ORB *orb);
 247 int css_do_tsch_get_irb(SubchDev *sch, IRB *irb, int *irb_len);
 248 void css_do_tsch_update_subch(SubchDev *sch);
 249 int css_do_stcrw(CRW *crw);
 250 void css_undo_stcrw(CRW *crw);
 251 int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid,
 252                          int rfmt, void *buf);
 253 void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo);
 254 int css_enable_mcsse(void);
 255 int css_enable_mss(void);
 256 IOInstEnding css_do_rsch(SubchDev *sch);
 257 int css_do_rchp(uint8_t cssid, uint8_t chpid);
 258 bool css_present(uint8_t cssid);
 259 #endif
 260
 261 extern const PropertyInfo css_devid_ro_propinfo;
 262
 263 #define DEFINE_PROP_CSS_DEV_ID_RO(_n, _s, _f) \
 264     DEFINE_PROP(_n, _s, _f, css_devid_ro_propinfo, CssDevId)
 265
 266 /**
 267  * Create a subchannel for the given bus id.
 268  *
 269  * If @p bus_id is valid, and @p squash_mcss is true, verify that it is
 270  * not already in use in the default css, and find a free devno from the
 271  * default css image for it.
 272  * If @p bus_id is valid, and @p squash_mcss is false, verify that it is
 273  * not already in use, and find a free devno for it.
 274  * If @p bus_id is not valid find a free subchannel id and device number
 275  * across all subchannel sets and all css images starting from the default
 276  * css image.
 277  *
 278  * If either of the former actions succeed, allocate a subchannel structure,
 279  * initialise it with the bus id, subchannel id and device number, register
 280  * it with the CSS and return it. Otherwise return NULL.
 281  *
 282  * The caller becomes owner of the returned subchannel structure and
 283  * is responsible for unregistering and freeing it.
 284  */
 285 SubchDev *css_create_sch(CssDevId bus_id, bool squash_mcss, Error **errp);
 286
 287 /** Turn on css migration */
 288 void css_register_vmstate(void);
 289
 290
 291 void ccw_dstream_init(CcwDataStream *cds, CCW1 const *ccw, ORB const *orb);
 292
 293 static inline void ccw_dstream_rewind(CcwDataStream *cds)
 294 {
 295     cds->at_byte = 0;
 296     cds->at_idaw = 0;
 297     cds->cda = cds->cda_orig;
 298 }
 299
 300 static inline bool ccw_dstream_good(CcwDataStream *cds)
 301 {
 302     return !(cds->flags & CDS_F_STREAM_BROKEN);
 303 }
 304
 305 static inline uint16_t ccw_dstream_residual_count(CcwDataStream *cds)
 306 {
 307     return cds->count - cds->at_byte;
 308 }
 309
 310 static inline uint16_t ccw_dstream_avail(CcwDataStream *cds)
 311 {
 312     return ccw_dstream_good(cds) ? ccw_dstream_residual_count(cds) : 0;
 313 }
 314
 315 static inline int ccw_dstream_advance(CcwDataStream *cds, int len)
 316 {
 317     return cds->op_handler(cds, NULL, len, CDS_OP_A);
 318 }
 319
 320 static inline int ccw_dstream_write_buf(CcwDataStream *cds, void *buff, int len)
 321 {
 322     return cds->op_handler(cds, buff, len, CDS_OP_W);
 323 }
 324
 325 static inline int ccw_dstream_read_buf(CcwDataStream *cds, void *buff, int len)
 326 {
 327     return cds->op_handler(cds, buff, len, CDS_OP_R);
 328 }
 329
 330 #define ccw_dstream_read(cds, v) ccw_dstream_read_buf((cds), &(v), sizeof(v))
 331 #define ccw_dstream_write(cds, v) ccw_dstream_write_buf((cds), &(v), sizeof(v))
 332
 333 #endif