6c15e9bfb6
This introduces a function named css_find_free_chpid() to find a free channel path. Because virtio-ccw device used zero as its channel path number, it would be sensible to skip the reserved one and search upwards. Signed-off-by: Jing Liu <liujbjl@linux.vnet.ibm.com> Reviewed-by: QingFeng Hao <haoqf@linux.vnet.ibm.com> Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
206 lines
6.5 KiB
C
206 lines
6.5 KiB
C
/*
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* Channel subsystem structures and definitions.
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*
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* Copyright 2012 IBM Corp.
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* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#ifndef CSS_H
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#define CSS_H
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#include "hw/s390x/adapter.h"
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#include "hw/s390x/s390_flic.h"
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#include "hw/s390x/ioinst.h"
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/* Channel subsystem constants. */
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#define MAX_DEVNO 65535
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#define MAX_SCHID 65535
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#define MAX_SSID 3
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#define MAX_CSSID 255
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#define MAX_CHPID 255
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#define MAX_ISC 7
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#define MAX_CIWS 62
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#define VIRTUAL_CSSID 0xfe
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#define VIRTIO_CCW_CHPID 0 /* used by convention */
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typedef struct CIW {
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uint8_t type;
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uint8_t command;
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uint16_t count;
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} QEMU_PACKED CIW;
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typedef struct SenseId {
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/* common part */
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uint8_t reserved; /* always 0x'FF' */
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uint16_t cu_type; /* control unit type */
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uint8_t cu_model; /* control unit model */
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uint16_t dev_type; /* device type */
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uint8_t dev_model; /* device model */
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uint8_t unused; /* padding byte */
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/* extended part */
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CIW ciw[MAX_CIWS]; /* variable # of CIWs */
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} QEMU_PACKED SenseId;
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/* Channel measurements, from linux/drivers/s390/cio/cmf.c. */
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typedef struct CMB {
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uint16_t ssch_rsch_count;
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uint16_t sample_count;
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uint32_t device_connect_time;
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uint32_t function_pending_time;
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uint32_t device_disconnect_time;
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uint32_t control_unit_queuing_time;
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uint32_t device_active_only_time;
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uint32_t reserved[2];
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} QEMU_PACKED CMB;
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typedef struct CMBE {
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uint32_t ssch_rsch_count;
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uint32_t sample_count;
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uint32_t device_connect_time;
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uint32_t function_pending_time;
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uint32_t device_disconnect_time;
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uint32_t control_unit_queuing_time;
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uint32_t device_active_only_time;
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uint32_t device_busy_time;
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uint32_t initial_command_response_time;
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uint32_t reserved[7];
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} QEMU_PACKED CMBE;
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typedef struct SubchDev SubchDev;
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struct SubchDev {
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/* channel-subsystem related things: */
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uint8_t cssid;
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uint8_t ssid;
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uint16_t schid;
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uint16_t devno;
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SCHIB curr_status;
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uint8_t sense_data[32];
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hwaddr channel_prog;
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CCW1 last_cmd;
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bool last_cmd_valid;
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bool ccw_fmt_1;
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bool thinint_active;
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uint8_t ccw_no_data_cnt;
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/* transport-provided data: */
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int (*ccw_cb) (SubchDev *, CCW1);
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void (*disable_cb)(SubchDev *);
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SenseId id;
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void *driver_data;
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};
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typedef struct IndAddr {
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hwaddr addr;
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uint64_t map;
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unsigned long refcnt;
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int len;
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QTAILQ_ENTRY(IndAddr) sibling;
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} IndAddr;
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IndAddr *get_indicator(hwaddr ind_addr, int len);
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void release_indicator(AdapterInfo *adapter, IndAddr *indicator);
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int map_indicator(AdapterInfo *adapter, IndAddr *indicator);
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typedef SubchDev *(*css_subch_cb_func)(uint8_t m, uint8_t cssid, uint8_t ssid,
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uint16_t schid);
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void subch_device_save(SubchDev *s, QEMUFile *f);
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int subch_device_load(SubchDev *s, QEMUFile *f);
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int css_create_css_image(uint8_t cssid, bool default_image);
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bool css_devno_used(uint8_t cssid, uint8_t ssid, uint16_t devno);
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void css_subch_assign(uint8_t cssid, uint8_t ssid, uint16_t schid,
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uint16_t devno, SubchDev *sch);
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void css_sch_build_virtual_schib(SubchDev *sch, uint8_t chpid, uint8_t type);
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unsigned int css_find_free_chpid(uint8_t cssid);
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uint16_t css_build_subchannel_id(SubchDev *sch);
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void css_reset(void);
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void css_reset_sch(SubchDev *sch);
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void css_queue_crw(uint8_t rsc, uint8_t erc, int chain, uint16_t rsid);
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void css_generate_sch_crws(uint8_t cssid, uint8_t ssid, uint16_t schid,
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int hotplugged, int add);
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void css_generate_chp_crws(uint8_t cssid, uint8_t chpid);
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void css_generate_css_crws(uint8_t cssid);
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void css_clear_sei_pending(void);
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void css_adapter_interrupt(uint8_t isc);
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typedef enum {
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CSS_IO_ADAPTER_VIRTIO = 0,
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CSS_IO_ADAPTER_PCI = 1,
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CSS_IO_ADAPTER_TYPE_NUMS,
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} CssIoAdapterType;
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uint32_t css_get_adapter_id(CssIoAdapterType type, uint8_t isc);
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void css_register_io_adapters(CssIoAdapterType type, bool swap, bool maskable,
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Error **errp);
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#ifndef CONFIG_USER_ONLY
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SubchDev *css_find_subch(uint8_t m, uint8_t cssid, uint8_t ssid,
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uint16_t schid);
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bool css_subch_visible(SubchDev *sch);
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void css_conditional_io_interrupt(SubchDev *sch);
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int css_do_stsch(SubchDev *sch, SCHIB *schib);
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bool css_schid_final(int m, uint8_t cssid, uint8_t ssid, uint16_t schid);
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int css_do_msch(SubchDev *sch, const SCHIB *schib);
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int css_do_xsch(SubchDev *sch);
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int css_do_csch(SubchDev *sch);
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int css_do_hsch(SubchDev *sch);
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int css_do_ssch(SubchDev *sch, ORB *orb);
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int css_do_tsch_get_irb(SubchDev *sch, IRB *irb, int *irb_len);
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void css_do_tsch_update_subch(SubchDev *sch);
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int css_do_stcrw(CRW *crw);
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void css_undo_stcrw(CRW *crw);
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int css_do_tpi(IOIntCode *int_code, int lowcore);
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int css_collect_chp_desc(int m, uint8_t cssid, uint8_t f_chpid, uint8_t l_chpid,
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int rfmt, void *buf);
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void css_do_schm(uint8_t mbk, int update, int dct, uint64_t mbo);
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int css_enable_mcsse(void);
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int css_enable_mss(void);
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int css_do_rsch(SubchDev *sch);
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int css_do_rchp(uint8_t cssid, uint8_t chpid);
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bool css_present(uint8_t cssid);
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#endif
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/*
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* Identify a device within the channel subsystem.
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* Note that this can be used to identify either the subchannel or
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* the attached I/O device, as there's always one I/O device per
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* subchannel.
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*/
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typedef struct CssDevId {
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uint8_t cssid;
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uint8_t ssid;
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uint16_t devid;
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bool valid;
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} CssDevId;
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extern PropertyInfo css_devid_propinfo;
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#define DEFINE_PROP_CSS_DEV_ID(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, css_devid_propinfo, CssDevId)
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extern PropertyInfo css_devid_ro_propinfo;
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#define DEFINE_PROP_CSS_DEV_ID_RO(_n, _s, _f) \
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DEFINE_PROP(_n, _s, _f, css_devid_ro_propinfo, CssDevId)
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/**
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* Create a subchannel for the given bus id.
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*
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* If @p bus_id is valid, verify that it uses the virtual channel
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* subsystem id and is not already in use, and find a free subchannel
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* id for it. If @p bus_id is not valid, find a free subchannel id and
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* device number across all subchannel sets. If either of the former
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* actions succeed, allocate a subchannel structure, initialise it
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* with the bus id, subchannel id and device number, register it with
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* the CSS and return it. Otherwise return NULL.
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*
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* The caller becomes owner of the returned subchannel structure and
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* is responsible for unregistering and freeing it.
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*/
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SubchDev *css_create_virtual_sch(CssDevId bus_id, Error **errp);
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#endif
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