diff options
| -rw-r--r-- | pc-bios/s390-ccw.img | bin | 17760 -> 26424 bytes | |||
| -rw-r--r-- | pc-bios/s390-ccw/Makefile | 2 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/bootmap.c | 129 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/bootmap.h | 9 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/main.c | 25 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/s390-ccw.h | 54 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/scsi.h | 184 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/virtio-scsi.c | 342 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/virtio-scsi.h | 72 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/virtio.c | 479 | ||||
| -rw-r--r-- | pc-bios/s390-ccw/virtio.h | 218 |
11 files changed, 1220 insertions, 294 deletions
diff --git a/pc-bios/s390-ccw.img b/pc-bios/s390-ccw.img index bd8f21050f..d3978ba050 100644 --- a/pc-bios/s390-ccw.img +++ b/pc-bios/s390-ccw.img Binary files differdiff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile index 11c5dd4799..4208cb4295 100644 --- a/pc-bios/s390-ccw/Makefile +++ b/pc-bios/s390-ccw/Makefile @@ -9,7 +9,7 @@ $(call set-vpath, $(SRC_PATH)/pc-bios/s390-ccw) .PHONY : all clean build-all -OBJECTS = start.o main.o bootmap.o sclp-ascii.o virtio.o +OBJECTS = start.o main.o bootmap.o sclp-ascii.o virtio.o virtio-scsi.o CFLAGS += -fPIE -fno-stack-protector -ffreestanding -march=z900 CFLAGS += -fno-delete-null-pointer-checks -msoft-float LDFLAGS += -Wl,-pie -nostdlib diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c index 492530275d..611102e3ef 100644 --- a/pc-bios/s390-ccw/bootmap.c +++ b/pc-bios/s390-ccw/bootmap.c @@ -72,7 +72,7 @@ static void jump_to_IPL_code(uint64_t address) asm volatile("lghi 1,1\n\t" "diag 1,1,0x308\n\t" : : : "1", "memory"); - virtio_panic("\n! IPL returns !\n"); + panic("\n! IPL returns !\n"); } /*********************************************************************** @@ -84,7 +84,7 @@ static const int max_bprs_entries = sizeof(_bprs) / sizeof(ExtEckdBlockPtr); static inline void verify_boot_info(BootInfo *bip) { - IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL magic"); + IPL_assert(magic_match(bip->magic, ZIPL_MAGIC), "No zIPL sig in BootInfo"); IPL_assert(bip->version == BOOT_INFO_VERSION, "Wrong zIPL version"); IPL_assert(bip->bp_type == BOOT_INFO_BP_TYPE_IPL, "DASD is not for IPL"); IPL_assert(bip->dev_type == BOOT_INFO_DEV_TYPE_ECKD, "DASD is not ECKD"); @@ -315,6 +315,40 @@ static void print_eckd_msg(void) sclp_print(msg); } +static void ipl_eckd(void) +{ + ScsiMbr *mbr = (void *)sec; + LDL_VTOC *vlbl = (void *)sec; + + print_eckd_msg(); + + /* Grab the MBR again */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(0, mbr, "Cannot read block 0 on DASD"); + + if (magic_match(mbr->magic, IPL1_MAGIC)) { + ipl_eckd_cdl(); /* no return */ + } + + /* LDL/CMS? */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(2, vlbl, "Cannot read block 2"); + + if (magic_match(vlbl->magic, CMS1_MAGIC)) { + ipl_eckd_ldl(ECKD_CMS); /* no return */ + } + if (magic_match(vlbl->magic, LNX1_MAGIC)) { + ipl_eckd_ldl(ECKD_LDL); /* no return */ + } + + ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ + /* + * Ok, it is not a LDL by any means. + * It still might be a CDL with zero record keys for IPL1 and IPL2 + */ + ipl_eckd_cdl(); +} + /*********************************************************************** * IPL a SCSI disk */ @@ -382,7 +416,7 @@ static void zipl_run(ScsiBlockPtr *pte) read_block(pte->blockno, tmp_sec, "Cannot read header"); header = (ComponentHeader *)tmp_sec; - IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic"); + IPL_assert(magic_match(tmp_sec, ZIPL_MAGIC), "No zIPL magic in header"); IPL_assert(header->type == ZIPL_COMP_HEADER_IPL, "Bad header type"); dputs("start loading images\n"); @@ -412,16 +446,26 @@ static void ipl_scsi(void) const int pte_len = sizeof(ScsiBlockPtr); ScsiBlockPtr *prog_table_entry; - /* The 0-th block (MBR) was already read into sec[] */ + /* Grab the MBR */ + memset(sec, FREE_SPACE_FILLER, sizeof(sec)); + read_block(0, mbr, "Cannot read block 0"); + + if (!magic_match(mbr->magic, ZIPL_MAGIC)) { + return; + } sclp_print("Using SCSI scheme.\n"); + debug_print_int("MBR Version", mbr->version_id); + IPL_check(mbr->version_id == 1, + "Unknown MBR layout version, assuming version 1"); debug_print_int("program table", mbr->blockptr.blockno); + IPL_assert(mbr->blockptr.blockno, "No Program Table"); /* Parse the program table */ read_block(mbr->blockptr.blockno, sec, "Error reading Program Table"); - IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic"); + IPL_assert(magic_match(sec, ZIPL_MAGIC), "No zIPL magic in PT"); ns_end = sec + virtio_get_block_size(); for (ns = (sec + pte_len); (ns + pte_len) < ns_end; ns += pte_len) { @@ -613,7 +657,7 @@ static IsoBcSection *find_iso_bc_entry(void) if (!is_iso_bc_valid(e)) { /* The validation entry is mandatory */ - virtio_panic("No valid boot catalog found!\n"); + panic("No valid boot catalog found!\n"); return NULL; } @@ -629,7 +673,7 @@ static IsoBcSection *find_iso_bc_entry(void) } } - virtio_panic("No suitable boot entry found on ISO-9660 media!\n"); + panic("No suitable boot entry found on ISO-9660 media!\n"); return NULL; } @@ -645,57 +689,58 @@ static void ipl_iso_el_torito(void) } /*********************************************************************** - * IPL starts here + * Bus specific IPL sequences */ -void zipl_load(void) +static void zipl_load_vblk(void) { - ScsiMbr *mbr = (void *)sec; - LDL_VTOC *vlbl = (void *)sec; - - /* Grab the MBR */ - memset(sec, FREE_SPACE_FILLER, sizeof(sec)); - read_block(0, mbr, "Cannot read block 0"); - - dputs("checking magic\n"); - - if (magic_match(mbr->magic, ZIPL_MAGIC)) { - ipl_scsi(); /* no return */ - } - - /* Check if we can boot as ISO media */ if (virtio_guessed_disk_nature()) { virtio_assume_iso9660(); } ipl_iso_el_torito(); - /* We have failed to follow the SCSI scheme, so */ if (virtio_guessed_disk_nature()) { sclp_print("Using guessed DASD geometry.\n"); virtio_assume_eckd(); } - print_eckd_msg(); - if (magic_match(mbr->magic, IPL1_MAGIC)) { - ipl_eckd_cdl(); /* no return */ + ipl_eckd(); +} + +static void zipl_load_vscsi(void) +{ + if (virtio_get_block_size() == VIRTIO_ISO_BLOCK_SIZE) { + /* Is it an ISO image in non-CD drive? */ + ipl_iso_el_torito(); } - /* LDL/CMS? */ - memset(sec, FREE_SPACE_FILLER, sizeof(sec)); - read_block(2, vlbl, "Cannot read block 2"); + sclp_print("Using guessed DASD geometry.\n"); + virtio_assume_eckd(); + ipl_eckd(); +} - if (magic_match(vlbl->magic, CMS1_MAGIC)) { - ipl_eckd_ldl(ECKD_CMS); /* no return */ - } - if (magic_match(vlbl->magic, LNX1_MAGIC)) { - ipl_eckd_ldl(ECKD_LDL); /* no return */ +/*********************************************************************** + * IPL starts here + */ + +void zipl_load(void) +{ + if (virtio_get_device()->is_cdrom) { + ipl_iso_el_torito(); + panic("\n! Cannot IPL this ISO image !\n"); } - ipl_eckd_ldl(ECKD_LDL_UNLABELED); /* it still may return */ - /* - * Ok, it is not a LDL by any means. - * It still might be a CDL with zero record keys for IPL1 and IPL2 - */ - ipl_eckd_cdl(); + ipl_scsi(); + + switch (virtio_get_device_type()) { + case VIRTIO_ID_BLOCK: + zipl_load_vblk(); + break; + case VIRTIO_ID_SCSI: + zipl_load_vscsi(); + break; + default: + panic("\n! Unknown IPL device type !\n"); + } - virtio_panic("\n* this can never happen *\n"); + panic("\n* this can never happen *\n"); } diff --git a/pc-bios/s390-ccw/bootmap.h b/pc-bios/s390-ccw/bootmap.h index f98765b841..bea168714b 100644 --- a/pc-bios/s390-ccw/bootmap.h +++ b/pc-bios/s390-ccw/bootmap.h @@ -264,15 +264,6 @@ typedef enum { /* utility code below */ -static inline void IPL_assert(bool term, const char *message) -{ - if (!term) { - sclp_print("\n! "); - sclp_print(message); - virtio_panic(" !\n"); /* no return */ - } -} - static const unsigned char ebc2asc[256] = /* 0123456789abcdef0123456789abcdef */ "................................" /* 1F */ diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c index d5fe4cea1d..1c9e0791ab 100644 --- a/pc-bios/s390-ccw/main.c +++ b/pc-bios/s390-ccw/main.c @@ -12,9 +12,8 @@ #include "virtio.h" char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); -char ring_area[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); uint64_t boot_value; -static struct subchannel_id blk_schid = { .one = 1 }; +static SubChannelId blk_schid = { .one = 1 }; /* * Priniciples of Operations (SA22-7832-09) chapter 17 requires that @@ -23,7 +22,7 @@ static struct subchannel_id blk_schid = { .one = 1 }; */ void write_subsystem_identification(void) { - struct subchannel_id *schid = (struct subchannel_id *) 184; + SubChannelId *schid = (SubChannelId *) 184; uint32_t *zeroes = (uint32_t *) 188; *schid = blk_schid; @@ -31,14 +30,14 @@ void write_subsystem_identification(void) } -void virtio_panic(const char *string) +void panic(const char *string) { sclp_print(string); disabled_wait(); while (1) { } } -static bool find_dev(struct schib *schib, int dev_no) +static bool find_dev(Schib *schib, int dev_no) { int i, r; @@ -51,7 +50,7 @@ static bool find_dev(struct schib *schib, int dev_no) if (!schib->pmcw.dnv) { continue; } - if (!virtio_is_blk(blk_schid)) { + if (!virtio_is_supported(blk_schid)) { continue; } if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) { @@ -64,7 +63,7 @@ static bool find_dev(struct schib *schib, int dev_no) static void virtio_setup(uint64_t dev_info) { - struct schib schib; + Schib schib; int ssid; bool found = false; uint16_t dev_no; @@ -92,15 +91,11 @@ static void virtio_setup(uint64_t dev_info) } } - if (!found) { - virtio_panic("No virtio-blk device found!\n"); - } + IPL_assert(found, "No virtio device found"); - virtio_setup_block(blk_schid); + virtio_setup_device(blk_schid); - if (!virtio_ipl_disk_is_valid()) { - virtio_panic("No valid hard disk detected.\n"); - } + IPL_assert(virtio_ipl_disk_is_valid(), "No valid IPL device detected"); } int main(void) @@ -111,6 +106,6 @@ int main(void) zipl_load(); /* no return */ - virtio_panic("Failed to load OS from hard disk\n"); + panic("Failed to load OS from hard disk\n"); return 0; /* make compiler happy */ } diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h index 5484c2a45c..616d96738d 100644 --- a/pc-bios/s390-ccw/s390-ccw.h +++ b/pc-bios/s390-ccw/s390-ccw.h @@ -45,15 +45,22 @@ typedef unsigned long long __u64; #include "cio.h" +typedef struct irb Irb; +typedef struct ccw1 Ccw1; +typedef struct cmd_orb CmdOrb; +typedef struct schib Schib; +typedef struct chsc_area_sda ChscAreaSda; +typedef struct senseid SenseId; +typedef struct subchannel_id SubChannelId; + /* start.s */ void disabled_wait(void); void consume_sclp_int(void); /* main.c */ -void virtio_panic(const char *string); +void panic(const char *string); void write_subsystem_identification(void); extern char stack[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); -extern char ring_area[PAGE_SIZE * 8] __attribute__((__aligned__(PAGE_SIZE))); extern uint64_t boot_value; /* sclp-ascii.c */ @@ -63,10 +70,11 @@ void sclp_setup(void); /* virtio.c */ unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2, ulong subchan_id, void *load_addr); -bool virtio_is_blk(struct subchannel_id schid); -void virtio_setup_block(struct subchannel_id schid); +bool virtio_is_supported(SubChannelId schid); +void virtio_setup_device(SubChannelId schid); int virtio_read(ulong sector, void *load_addr); int enable_mss_facility(void); +ulong get_second(void); /* bootmap.c */ void zipl_load(void); @@ -143,4 +151,42 @@ static inline void yield(void) #define MAX_SECTOR_SIZE 4096 +static inline void sleep(unsigned int seconds) +{ + ulong target = get_second() + seconds; + + while (get_second() < target) { + yield(); + } +} + +static inline void *memcpy(void *s1, const void *s2, size_t n) +{ + uint8_t *p1 = s1; + const uint8_t *p2 = s2; + + while (n--) { + p1[n] = p2[n]; + } + return s1; +} + +static inline void IPL_assert(bool term, const char *message) +{ + if (!term) { + sclp_print("\n! "); + sclp_print(message); + panic(" !\n"); /* no return */ + } +} + +static inline void IPL_check(bool term, const char *message) +{ + if (!term) { + sclp_print("\n! WARNING: "); + sclp_print(message); + sclp_print(" !\n"); + } +} + #endif /* S390_CCW_H */ diff --git a/pc-bios/s390-ccw/scsi.h b/pc-bios/s390-ccw/scsi.h new file mode 100644 index 0000000000..fc830f7e52 --- /dev/null +++ b/pc-bios/s390-ccw/scsi.h @@ -0,0 +1,184 @@ +/* + * SCSI definitions for s390 machine loader for qemu + * + * Copyright 2015 IBM Corp. + * Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#ifndef SCSI_H +#define SCSI_H + +#include "s390-ccw.h" + +#define SCSI_DEFAULT_CDB_SIZE 32 +#define SCSI_DEFAULT_SENSE_SIZE 96 + +#define CDB_STATUS_GOOD 0 +#define CDB_STATUS_CHECK_CONDITION 0x02U +#define CDB_STATUS_VALID(status) (((status) & ~0x3eU) == 0) + +#define SCSI_SENSE_CODE_MASK 0x7fU +#define SCSI_SENSE_KEY_MASK 0x0fU +#define SCSI_SENSE_KEY_NO_SENSE 0 +#define SCSI_SENSE_KEY_UNIT_ATTENTION 6 + +union ScsiLun { + uint64_t v64; /* numeric shortcut */ + uint8_t v8[8]; /* generic 8 bytes representation */ + uint16_t v16[4]; /* 4-level big-endian LUN as specified by SAM-2 */ +}; +typedef union ScsiLun ScsiLun; + +struct ScsiSense70 { + uint8_t b0; /* b0 & 7f = resp code (0x70 or 0x71) */ + uint8_t b1, b2; /* b2 & 0f = sense key */ + uint8_t u1[1 * 4 + 1 + 1 * 4]; /* b7 = N - 7 */ + uint8_t additional_sense_code; /* b12 */ + uint8_t additional_sense_code_qualifier; /* b13 */ + uint8_t u2[1 + 3 + 0]; /* up to N (<=252) bytes */ +} __attribute__((packed)); +typedef struct ScsiSense70 ScsiSense70; + +/* don't confuse with virtio-scsi response/status fields! */ + +static inline uint8_t scsi_sense_response(const void *p) +{ + return ((const ScsiSense70 *)p)->b0 & SCSI_SENSE_CODE_MASK; +} + +static inline uint8_t scsi_sense_key(const void *p) +{ + return ((const ScsiSense70 *)p)->b2 & SCSI_SENSE_KEY_MASK; +} + +#define SCSI_INQ_RDT_CDROM 0x05 + +struct ScsiInquiryStd { + uint8_t peripheral_qdt; /* b0, use (b0 & 0x1f) to get SCSI_INQ_RDT */ + uint8_t b1; /* Removable Media Bit = b1 & 0x80 */ + uint8_t spc_version; /* b2 */ + uint8_t b3; /* b3 & 0x0f == resp_data_fmt == 2, must! */ + uint8_t u1[1 + 1 + 1 + 1 + 8]; /* b4..b15 unused, b4 = (N - 1) */ + char prod_id[16]; /* "QEMU CD-ROM" is here */ + uint8_t u2[4 /* b32..b35 unused, mandatory */ + + 8 + 12 + 1 + 1 + 8 * 2 + 22 /* b36..95 unused, optional*/ + + 0]; /* b96..bN unused, vendor specific */ + /* byte N */ +} __attribute__((packed)); +typedef struct ScsiInquiryStd ScsiInquiryStd; + +struct ScsiCdbInquiry { + uint8_t command; /* b0, == 0x12 */ + uint8_t b1; /* b1, |= 0x01 (evpd) */ + uint8_t b2; /* b2; if evpd==1 */ + uint16_t alloc_len; /* b3, b4 */ + uint8_t control; /* b5 */ +} __attribute__((packed)); +typedef struct ScsiCdbInquiry ScsiCdbInquiry; + +struct ScsiCdbRead10 { + uint8_t command; /* =0x28 */ + uint8_t b1; + uint32_t lba; + uint8_t b6; + uint16_t xfer_length; + uint8_t control; +} __attribute__((packed)); +typedef struct ScsiCdbRead10 ScsiCdbRead10; + +struct ScsiCdbTestUnitReady { + uint8_t command; /* =0x00 */ + uint8_t b1_b4[4]; + uint8_t control; +} __attribute__((packed)); +typedef struct ScsiCdbTestUnitReady ScsiCdbTestUnitReady; + +struct ScsiCdbReportLuns { + uint8_t command; /* =0xa0 */ + uint8_t b1; + uint8_t select_report; /* =0x02, "all" */ + uint8_t b3_b5[3]; + uint32_t alloc_len; + uint8_t b10; + uint8_t control; +} __attribute__((packed)); +typedef struct ScsiCdbReportLuns ScsiCdbReportLuns; + +struct ScsiLunReport { + uint32_t lun_list_len; + uint32_t b4_b7; + ScsiLun lun[1]; /* space for at least 1 lun must be allocated */ +} __attribute__((packed)); +typedef struct ScsiLunReport ScsiLunReport; + +struct ScsiCdbReadCapacity16 { + uint8_t command; /* =0x9e = "service action in 16" */ + uint8_t service_action; /* 5 bits, =0x10 = "read capacity 16" */ + uint64_t b2_b9; + uint32_t alloc_len; + uint8_t b14; + uint8_t control; +} __attribute__((packed)); +typedef struct ScsiCdbReadCapacity16 ScsiCdbReadCapacity16; + +struct ScsiReadCapacity16Data { + uint64_t ret_lba; /* get it, 0..7 */ + uint32_t lb_len; /* bytes, 8..11 */ + uint8_t u1[2 + 1 * 2 + 16]; /* b12..b31, unused */ +} __attribute__((packed)); +typedef struct ScsiReadCapacity16Data ScsiReadCapacity16Data; + +static inline ScsiLun make_lun(uint16_t channel, uint16_t target, uint32_t lun) +{ + ScsiLun r = { .v64 = 0 }; + + /* See QEMU code to choose the way to handle LUNs. + * + * So, a valid LUN must have (always channel #0): + * lun[0] == 1 + * lun[1] - target, any value + * lun[2] == 0 or (LUN, MSB, 0x40 set, 0x80 clear) + * lun[3] - LUN, LSB, any value + */ + r.v8[0] = 1; + r.v8[1] = target & 0xffU; + r.v8[2] = (lun >> 8) & 0x3fU; + if (r.v8[2]) { + r.v8[2] |= 0x40; + } + r.v8[3] = lun & 0xffU; + + return r; +} + +static inline const char *scsi_cdb_status_msg(uint8_t status) +{ + static char err_msg[] = "STATUS=XX"; + uint8_t v = status & 0x3eU; + + fill_hex_val(err_msg + 7, &v, 1); + return err_msg; +} + +static inline const char *scsi_cdb_asc_msg(const void *s) +{ + static char err_msg[] = "RSPN=XX KEY=XX CODE=XX QLFR=XX"; + const ScsiSense70 *p = s; + uint8_t sr = scsi_sense_response(s); + uint8_t sk = scsi_sense_key(s); + uint8_t ac = p->additional_sense_code; + uint8_t cq = p->additional_sense_code_qualifier; + + fill_hex_val(err_msg + 5, &sr, 1); + fill_hex_val(err_msg + 12, &sk, 1); + fill_hex_val(err_msg + 20, &ac, 1); + fill_hex_val(err_msg + 28, &cq, 1); + + return err_msg; +} + +#endif /* SCSI_H */ diff --git a/pc-bios/s390-ccw/virtio-scsi.c b/pc-bios/s390-ccw/virtio-scsi.c new file mode 100644 index 0000000000..3bb48e917e --- /dev/null +++ b/pc-bios/s390-ccw/virtio-scsi.c @@ -0,0 +1,342 @@ +/* + * Virtio-SCSI implementation for s390 machine loader for qemu + * + * Copyright 2015 IBM Corp. + * Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#include "s390-ccw.h" +#include "virtio.h" +#include "scsi.h" +#include "virtio-scsi.h" + +static ScsiDevice default_scsi_device; +static VirtioScsiCmdReq req; +static VirtioScsiCmdResp resp; + +static uint8_t scsi_inquiry_std_response[256]; + +static inline void vs_assert(bool term, const char **msgs) +{ + if (!term) { + int i = 0; + + sclp_print("\n! "); + while (msgs[i]) { + sclp_print(msgs[i++]); + } + panic(" !\n"); + } +} + +static void virtio_scsi_verify_response(VirtioScsiCmdResp *resp, + const char *title) +{ + const char *mr[] = { + title, ": response ", virtio_scsi_response_msg(resp), 0 + }; + const char *ms[] = { + title, + CDB_STATUS_VALID(resp->status) ? ": " : ": invalid ", + scsi_cdb_status_msg(resp->status), + resp->status == CDB_STATUS_CHECK_CONDITION ? " " : 0, + resp->sense_len ? scsi_cdb_asc_msg(resp->sense) + : "no sense data", + scsi_sense_response(resp->sense) == 0x70 ? ", sure" : "?", + 0 + }; + + vs_assert(resp->response == VIRTIO_SCSI_S_OK, mr); + vs_assert(resp->status == CDB_STATUS_GOOD, ms); +} + +static void prepare_request(VDev *vdev, const void *cdb, int cdb_size, + void *data, uint32_t data_size) +{ + const ScsiDevice *sdev = vdev->scsi_device; + + memset(&req, 0, sizeof(req)); + req.lun = make_lun(sdev->channel, sdev->target, sdev->lun); + memcpy(&req.cdb, cdb, cdb_size); + + memset(&resp, 0, sizeof(resp)); + resp.status = 0xff; /* set invalid */ + resp.response = 0xff; /* */ + + if (data && data_size) { + memset(data, 0, data_size); + } +} + +static inline void vs_io_assert(bool term, const char *msg) +{ + if (!term) { + virtio_scsi_verify_response(&resp, msg); + } +} + +static void vs_run(const char *title, VirtioCmd *cmd, VDev *vdev, + const void *cdb, int cdb_size, + void *data, uint32_t data_size) +{ + prepare_request(vdev, cdb, cdb_size, data, data_size); + vs_io_assert(virtio_run(vdev, VR_REQUEST, cmd) == 0, title); +} + +/* SCSI protocol implementation routines */ + +static bool scsi_inquiry(VDev *vdev, void *data, uint32_t data_size) +{ + ScsiCdbInquiry cdb = { + .command = 0x12, + .alloc_len = data_size < 65535 ? data_size : 65535, + }; + VirtioCmd inquiry[] = { + { &req, sizeof(req), VRING_DESC_F_NEXT }, + { &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT }, + { data, data_size, VRING_DESC_F_WRITE }, + }; + + vs_run("inquiry", inquiry, vdev, &cdb, sizeof(cdb), data, data_size); + + return virtio_scsi_response_ok(&resp); +} + +static bool scsi_test_unit_ready(VDev *vdev) +{ + ScsiCdbTestUnitReady cdb = { + .command = 0x00, + }; + VirtioCmd test_unit_ready[] = { + { &req, sizeof(req), VRING_DESC_F_NEXT }, + { &resp, sizeof(resp), VRING_DESC_F_WRITE }, + }; + + prepare_request(vdev, &cdb, sizeof(cdb), 0, 0); + virtio_run(vdev, VR_REQUEST, test_unit_ready); /* ignore errors here */ + + return virtio_scsi_response_ok(&resp); +} + +static bool scsi_report_luns(VDev *vdev, void *data, uint32_t data_size) +{ + ScsiCdbReportLuns cdb = { + .command = 0xa0, + .select_report = 0x02, /* REPORT ALL */ + .alloc_len = data_size, + }; + VirtioCmd report_luns[] = { + { &req, sizeof(req), VRING_DESC_F_NEXT }, + { &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT }, + { data, data_size, VRING_DESC_F_WRITE }, + }; + + vs_run("report luns", report_luns, + vdev, &cdb, sizeof(cdb), data, data_size); + + return virtio_scsi_response_ok(&resp); +} + +static bool scsi_read_10(VDev *vdev, + ulong sector, int sectors, void *data) +{ + int f = vdev->blk_factor; + unsigned int data_size = sectors * virtio_get_block_size() * f; + ScsiCdbRead10 cdb = { + .command = 0x28, + .lba = sector * f, + .xfer_length = sectors * f, + }; + VirtioCmd read_10[] = { + { &req, sizeof(req), VRING_DESC_F_NEXT }, + { &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT }, + { data, data_size * f, VRING_DESC_F_WRITE }, + }; + + debug_print_int("read_10 sector", sector); + debug_print_int("read_10 sectors", sectors); + + vs_run("read(10)", read_10, vdev, &cdb, sizeof(cdb), data, data_size); + + return virtio_scsi_response_ok(&resp); +} + +static bool scsi_read_capacity(VDev *vdev, + void *data, uint32_t data_size) +{ + ScsiCdbReadCapacity16 cdb = { + .command = 0x9e, /* SERVICE_ACTION_IN_16 */ + .service_action = 0x10, /* SA_READ_CAPACITY */ + .alloc_len = data_size, + }; + VirtioCmd read_capacity_16[] = { + { &req, sizeof(req), VRING_DESC_F_NEXT }, + { &resp, sizeof(resp), VRING_DESC_F_WRITE | VRING_DESC_F_NEXT }, + { data, data_size, VRING_DESC_F_WRITE }, + }; + + vs_run("read capacity", read_capacity_16, + vdev, &cdb, sizeof(cdb), data, data_size); + + return virtio_scsi_response_ok(&resp); +} + +/* virtio-scsi routines */ + +static void virtio_scsi_locate_device(VDev *vdev) +{ + const uint16_t channel = 0; /* again, it's what QEMU does */ + uint16_t target; + static uint8_t data[16 + 8 * 63]; + ScsiLunReport *r = (void *) data; + ScsiDevice *sdev = vdev->scsi_device; + int i, luns; + + /* QEMU has hardcoded channel #0 in many places. + * If this hardcoded value is ever changed, we'll need to add code for + * vdev->config.scsi.max_channel != 0 here. + */ + debug_print_int("config.scsi.max_channel", vdev->config.scsi.max_channel); + debug_print_int("config.scsi.max_target ", vdev->config.scsi.max_target); + debug_print_int("config.scsi.max_lun ", vdev->config.scsi.max_lun); + + for (target = 0; target <= vdev->config.scsi.max_target; target++) { + sdev->channel = channel; + sdev->target = target; /* sdev->lun will be 0 here */ + if (!scsi_report_luns(vdev, data, sizeof(data))) { + if (resp.response == VIRTIO_SCSI_S_BAD_TARGET) { + continue; + } + print_int("target", target); + virtio_scsi_verify_response(&resp, "SCSI cannot report LUNs"); + } + if (r->lun_list_len == 0) { + print_int("no LUNs for target", target); + continue; + } + luns = r->lun_list_len / 8; + debug_print_int("LUNs reported", luns); + if (luns == 1) { + /* There is no ",lun=#" arg for -device or ",lun=0" given. + * Hence, the only LUN reported. + * Usually, it's 0. + */ + sdev->lun = r->lun[0].v16[0]; /* it's returned this way */ + debug_print_int("Have to use LUN", sdev->lun); + return; /* we have to use this device */ + } + for (i = 0; i < luns; i++) { + if (r->lun[i].v64) { + /* Look for non-zero LUN - we have where to choose from */ + sdev->lun = r->lun[i].v16[0]; + debug_print_int("Will use LUN", sdev->lun); + return; /* we have found a device */ + } + } + } + panic("\n! Cannot locate virtio-scsi device !\n"); +} + +int virtio_scsi_read_many(VDev *vdev, + ulong sector, void *load_addr, int sec_num) +{ + if (!scsi_read_10(vdev, sector, sec_num, load_addr)) { + virtio_scsi_verify_response(&resp, "virtio-scsi:read_many"); + } + + return 0; +} + +static bool virtio_scsi_inquiry_response_is_cdrom(void *data) +{ + const ScsiInquiryStd *response = data; + const int resp_data_fmt = response->b3 & 0x0f; + int i; + + IPL_check(resp_data_fmt == 2, "Wrong INQUIRY response format"); + if (resp_data_fmt != 2) { + return false; /* cannot decode */ + } + + if ((response->peripheral_qdt & 0x1f) == SCSI_INQ_RDT_CDROM) { + return true; + } + + for (i = 0; i < sizeof(response->prod_id); i++) { + if (response->prod_id[i] != QEMU_CDROM_SIGNATURE[i]) { + return false; + } + } + return true; +} + +static void scsi_parse_capacity_report(void *data, + uint64_t *last_lba, uint32_t *lb_len) +{ + ScsiReadCapacity16Data *p = data; + + if (last_lba) { + *last_lba = p->ret_lba; + } + + if (lb_len) { + *lb_len = p->lb_len; + } +} + +void virtio_scsi_setup(VDev *vdev) +{ + int retry_test_unit_ready = 3; + uint8_t data[256]; + uint32_t data_size = sizeof(data); + + vdev->scsi_device = &default_scsi_device; + virtio_scsi_locate_device(vdev); + + /* We have to "ping" the device before it becomes readable */ + while (!scsi_test_unit_ready(vdev)) { + + if (!virtio_scsi_response_ok(&resp)) { + uint8_t code = resp.sense[0] & SCSI_SENSE_CODE_MASK; + uint8_t sense_key = resp.sense[2] & SCSI_SENSE_KEY_MASK; + + IPL_assert(resp.sense_len != 0, "virtio-scsi:setup: no SENSE data"); + + IPL_assert(retry_test_unit_ready && code == 0x70 && + sense_key == SCSI_SENSE_KEY_UNIT_ATTENTION, + "virtio-scsi:setup: cannot retry"); + + /* retry on CHECK_CONDITION/UNIT_ATTENTION as it + * may not designate a real error, but it may be + * a result of device reset, etc. + */ + retry_test_unit_ready--; + sleep(1); + continue; + } + + virtio_scsi_verify_response(&resp, "virtio-scsi:setup"); + } + + /* read and cache SCSI INQUIRY response */ + if (!scsi_inquiry(vdev, scsi_inquiry_std_response, + sizeof(scsi_inquiry_std_response))) { + virtio_scsi_verify_response(&resp, "virtio-scsi:setup:inquiry"); + } + + if (virtio_scsi_inquiry_response_is_cdrom(scsi_inquiry_std_response)) { + sclp_print("SCSI CD-ROM detected.\n"); + vdev->is_cdrom = true; + vdev->scsi_block_size = VIRTIO_ISO_BLOCK_SIZE; + } + + if (!scsi_read_capacity(vdev, data, data_size)) { + virtio_scsi_verify_response(&resp, "virtio-scsi:setup:read_capacity"); + } + scsi_parse_capacity_report(data, &vdev->scsi_last_block, + (uint32_t *) &vdev->scsi_block_size); +} diff --git a/pc-bios/s390-ccw/virtio-scsi.h b/pc-bios/s390-ccw/virtio-scsi.h new file mode 100644 index 0000000000..f50b38b18b --- /dev/null +++ b/pc-bios/s390-ccw/virtio-scsi.h @@ -0,0 +1,72 @@ +/* + * Virtio-SCSI definitions for s390 machine loader for qemu + * + * Copyright 2015 IBM Corp. + * Author: Eugene "jno" Dvurechenski <jno@linux.vnet.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or (at + * your option) any later version. See the COPYING file in the top-level + * directory. + */ + +#ifndef VIRTIO_SCSI_H +#define VIRTIO_SCSI_H + +#include "s390-ccw.h" +#include "virtio.h" +#include "scsi.h" + +#define VIRTIO_SCSI_CDB_SIZE SCSI_DEFAULT_CDB_SIZE +#define VIRTIO_SCSI_SENSE_SIZE SCSI_DEFAULT_SENSE_SIZE + +/* command-specific response values */ +#define VIRTIO_SCSI_S_OK 0x00 +#define VIRTIO_SCSI_S_BAD_TARGET 0x03 + +#define QEMU_CDROM_SIGNATURE "QEMU CD-ROM " + +enum virtio_scsi_vq_id { + VR_CONTROL = 0, + VR_EVENT = 1, + VR_REQUEST = 2, +}; + +struct VirtioScsiCmdReq { + ScsiLun lun; + uint64_t id; + uint8_t task_attr; /* = 0 = VIRTIO_SCSI_S_SIMPLE */ + uint8_t prio; + uint8_t crn; /* = 0 */ + uint8_t cdb[VIRTIO_SCSI_CDB_SIZE]; +} __attribute__((packed)); +typedef struct VirtioScsiCmdReq VirtioScsiCmdReq; + +struct VirtioScsiCmdResp { + uint32_t sense_len; + uint32_t residual; + uint16_t status_qualifier; + uint8_t status; /* first check for .response */ + uint8_t response; /* then for .status */ + uint8_t sense[VIRTIO_SCSI_SENSE_SIZE]; +} __attribute__((packed)); +typedef struct VirtioScsiCmdResp VirtioScsiCmdResp; + +static inline const char *virtio_scsi_response_msg(const VirtioScsiCmdResp *r) +{ + static char err_msg[] = "VS RESP=XX"; + uint8_t v = r->response; + + fill_hex_val(err_msg + 8, &v, 1); + return err_msg; +} + +static inline bool virtio_scsi_response_ok(const VirtioScsiCmdResp *r) +{ + return r->response == VIRTIO_SCSI_S_OK && r->status == CDB_STATUS_GOOD; +} + +void virtio_scsi_setup(VDev *vdev); +int virtio_scsi_read_many(VDev *vdev, + ulong sector, void *load_addr, int sec_num); + +#endif /* VIRTIO_SCSI_H */ diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 87aed38a95..1d34e8c1aa 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -10,39 +10,68 @@ #include "s390-ccw.h" #include "virtio.h" +#include "virtio-scsi.h" -static struct vring block; +#define VRING_WAIT_REPLY_TIMEOUT 3 + +static VRing block[VIRTIO_MAX_VQS]; +static char ring_area[VIRTIO_RING_SIZE * VIRTIO_MAX_VQS] + __attribute__((__aligned__(PAGE_SIZE))); static char chsc_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); +static VDev vdev = { + .nr_vqs = 1, + .vrings = block, + .cmd_vr_idx = 0, + .ring_area = ring_area, + .wait_reply_timeout = VRING_WAIT_REPLY_TIMEOUT, + .schid = { .one = 1 }, + .scsi_block_size = VIRTIO_SCSI_BLOCK_SIZE, + .blk_factor = 1, +}; + +VDev *virtio_get_device(void) +{ + return &vdev; +} + +VirtioDevType virtio_get_device_type(void) +{ + return vdev.senseid.cu_model; +} + +/* virtio spec v1.0 para 4.3.3.2 */ static long kvm_hypercall(unsigned long nr, unsigned long param1, - unsigned long param2) + unsigned long param2, unsigned long param3) { register ulong r_nr asm("1") = nr; register ulong r_param1 asm("2") = param1; register ulong r_param2 asm("3") = param2; + register ulong r_param3 asm("4") = param3; register long retval asm("2"); asm volatile ("diag 2,4,0x500" : "=d" (retval) - : "d" (r_nr), "0" (r_param1), "r"(r_param2) + : "d" (r_nr), "0" (r_param1), "r"(r_param2), "d"(r_param3) : "memory", "cc"); return retval; } -static void virtio_notify(struct subchannel_id schid) +static long virtio_notify(SubChannelId schid, int vq_idx, long cookie) { - kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid, 0); + return kvm_hypercall(KVM_S390_VIRTIO_CCW_NOTIFY, *(u32 *)&schid, + vq_idx, cookie); } /*********************************************** * Virtio functions * ***********************************************/ -static int drain_irqs(struct subchannel_id schid) +static int drain_irqs(SubChannelId schid) { - struct irb irb = {}; + Irb irb = {}; int r = 0; while (1) { @@ -59,17 +88,17 @@ static int drain_irqs(struct subchannel_id schid) } } -static int run_ccw(struct subchannel_id schid, int cmd, void *ptr, int len) +static int run_ccw(VDev *vdev, int cmd, void *ptr, int len) { - struct ccw1 ccw = {}; - struct cmd_orb orb = {}; - struct schib schib; + Ccw1 ccw = {}; + CmdOrb orb = {}; + Schib schib; int r; /* start command processing */ - stsch_err(schid, &schib); + stsch_err(vdev->schid, &schib); schib.scsw.ctrl = SCSW_FCTL_START_FUNC; - msch(schid, &schib); + msch(vdev->schid, &schib); /* start subchannel command */ orb.fmt = 1; @@ -80,41 +109,29 @@ static int run_ccw(struct subchannel_id schid, int cmd, void *ptr, int len) ccw.cda = (long)ptr; ccw.count = len; - r = ssch(schid, &orb); + r = ssch(vdev->schid, &orb); /* * XXX Wait until device is done processing the CCW. For now we can * assume that a simple tsch will have finished the CCW processing, * but the architecture allows for asynchronous operation */ if (!r) { - r = drain_irqs(schid); + r = drain_irqs(vdev->schid); } return r; } -static void virtio_set_status(struct subchannel_id schid, - unsigned long dev_addr) +static void vring_init(VRing *vr, VqInfo *info) { - unsigned char status = dev_addr; - if (run_ccw(schid, CCW_CMD_WRITE_STATUS, &status, sizeof(status))) { - virtio_panic("Could not write status to host!\n"); - } -} + void *p = (void *) info->queue; -static void virtio_reset(struct subchannel_id schid) -{ - run_ccw(schid, CCW_CMD_VDEV_RESET, NULL, 0); -} - -static void vring_init(struct vring *vr, unsigned int num, void *p, - unsigned long align) -{ debug_print_addr("init p", p); - vr->num = num; + vr->id = info->index; + vr->num = info->num; vr->desc = p; - vr->avail = p + num*sizeof(struct vring_desc); - vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + align-1) - & ~(align - 1)); + vr->avail = p + info->num * sizeof(VRingDesc); + vr->used = (void *)(((unsigned long)&vr->avail->ring[info->num] + + info->align - 1) & ~(info->align - 1)); /* Zero out all relevant field */ vr->avail->flags = 0; @@ -125,16 +142,18 @@ static void vring_init(struct vring *vr, unsigned int num, void *p, vr->used->idx = 0; vr->used_idx = 0; vr->next_idx = 0; + vr->cookie = 0; debug_print_addr("init vr", vr); } -static void vring_notify(struct subchannel_id schid) +static bool vring_notify(VRing *vr) { - virtio_notify(schid); + vr->cookie = virtio_notify(vr->schid, vr->id, vr->cookie); + return vr->cookie >= 0; } -static void vring_send_buf(struct vring *vr, void *p, int len, int flags) +static void vring_send_buf(VRing *vr, void *p, int len, int flags) { /* For follow-up chains we need to keep the first entry point */ if (!(flags & VRING_HIDDEN_IS_CHAIN)) { @@ -162,11 +181,26 @@ static u64 get_clock(void) return r; } -static ulong get_second(void) +ulong get_second(void) { return (get_clock() >> 12) / 1000000; } +static int vr_poll(VRing *vr) +{ + if (vr->used->idx == vr->used_idx) { + vring_notify(vr); + yield(); + return 0; + } + + vr->used_idx = vr->used->idx; + vr->next_idx = 0; + vr->desc[0].len = 0; + vr->desc[0].flags = 0; + return 1; /* vr has been updated */ +} + /* * Wait for the host to reply. * @@ -174,67 +208,92 @@ static ulong get_second(void) * * Returns 0 on success, 1 on timeout. */ -static int vring_wait_reply(struct vring *vr, int timeout) +static int vring_wait_reply(void) { - ulong target_second = get_second() + timeout; - struct subchannel_id schid = vr->schid; - int r = 0; + ulong target_second = get_second() + vdev.wait_reply_timeout; - /* Wait until the used index has moved. */ - while (vr->used->idx == vr->used_idx) { - vring_notify(schid); - if (timeout && (get_second() >= target_second)) { - r = 1; - break; + /* Wait for any queue to be updated by the host */ + do { + int i, r = 0; + + for (i = 0; i < vdev.nr_vqs; i++) { + r += vr_poll(&vdev.vrings[i]); } yield(); - } + if (r) { + return 0; + } + } while (!vdev.wait_reply_timeout || (get_second() < target_second)); - vr->used_idx = vr->used->idx; - vr->next_idx = 0; - vr->desc[0].len = 0; - vr->desc[0].flags = 0; + return 1; +} - return r; +int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd) +{ + VRing *vr = &vdev->vrings[vqid]; + int i = 0; + + do { + vring_send_buf(vr, cmd[i].data, cmd[i].size, + cmd[i].flags | (i ? VRING_HIDDEN_IS_CHAIN : 0)); + } while (cmd[i++].flags & VRING_DESC_F_NEXT); + + vring_wait_reply(); + if (drain_irqs(vr->schid)) { + return -1; + } + return 0; } /*********************************************** * Virtio block * ***********************************************/ -int virtio_read_many(ulong sector, void *load_addr, int sec_num) +static int virtio_blk_read_many(VDev *vdev, + ulong sector, void *load_addr, int sec_num) { - struct virtio_blk_outhdr out_hdr; + VirtioBlkOuthdr out_hdr; u8 status; - int r; + VRing *vr = &vdev->vrings[vdev->cmd_vr_idx]; /* Tell the host we want to read */ out_hdr.type = VIRTIO_BLK_T_IN; out_hdr.ioprio = 99; out_hdr.sector = virtio_sector_adjust(sector); - vring_send_buf(&block, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT); + vring_send_buf(vr, &out_hdr, sizeof(out_hdr), VRING_DESC_F_NEXT); /* This is where we want to receive data */ - vring_send_buf(&block, load_addr, virtio_get_block_size() * sec_num, + vring_send_buf(vr, load_addr, virtio_get_block_size() * sec_num, VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN | VRING_DESC_F_NEXT); /* status field */ - vring_send_buf(&block, &status, sizeof(u8), VRING_DESC_F_WRITE | - VRING_HIDDEN_IS_CHAIN); + vring_send_buf(vr, &status, sizeof(u8), + VRING_DESC_F_WRITE | VRING_HIDDEN_IS_CHAIN); /* Now we can tell the host to read */ - vring_wait_reply(&block, 0); + vring_wait_reply(); - r = drain_irqs(block.schid); - if (r) { + if (drain_irqs(vr->schid)) { /* Well, whatever status is supposed to contain... */ status = 1; } return status; } +int virtio_read_many(ulong sector, void *load_addr, int sec_num) +{ + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return virtio_blk_read_many(&vdev, sector, load_addr, sec_num); + case VIRTIO_ID_SCSI: + return virtio_scsi_read_many(&vdev, sector, load_addr, sec_num); + } + panic("\n! No readable IPL device !\n"); + return -1; +} + unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2, ulong subchan_id, void *load_addr) { @@ -251,7 +310,7 @@ unsigned long virtio_load_direct(ulong rec_list1, ulong rec_list2, sclp_print("."); status = virtio_read_many(sec, (void *)addr, sec_num); if (status) { - virtio_panic("I/O Error"); + panic("I/O Error"); } addr += sec_num * virtio_get_block_size(); @@ -263,78 +322,110 @@ int virtio_read(ulong sector, void *load_addr) return virtio_read_many(sector, load_addr, 1); } -static VirtioBlkConfig blk_cfg = {}; -static bool guessed_disk_nature; +/* + * Other supported value pairs, if any, would need to be added here. + * Note: head count is always 15. + */ +static inline u8 virtio_eckd_sectors_for_block_size(int size) +{ + switch (size) { + case 512: + return 49; + case 1024: + return 33; + case 2048: + return 21; + case 4096: + return 12; + } + return 0; +} -bool virtio_guessed_disk_nature(void) +VirtioGDN virtio_guessed_disk_nature(void) { - return guessed_disk_nature; + return vdev.guessed_disk_nature; } void virtio_assume_scsi(void) { - guessed_disk_nature = true; - blk_cfg.blk_size = 512; - blk_cfg.physical_block_exp = 0; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + vdev.guessed_disk_nature = VIRTIO_GDN_SCSI; + vdev.config.blk.blk_size = VIRTIO_SCSI_BLOCK_SIZE; + vdev.config.blk.physical_block_exp = 0; + vdev.blk_factor = 1; + break; + case VIRTIO_ID_SCSI: + vdev.scsi_block_size = VIRTIO_SCSI_BLOCK_SIZE; + break; + } } void virtio_assume_iso9660(void) { - guessed_disk_nature = true; - blk_cfg.blk_size = 2048; - blk_cfg.physical_block_exp = 0; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + vdev.guessed_disk_nature = VIRTIO_GDN_SCSI; + vdev.config.blk.blk_size = VIRTIO_ISO_BLOCK_SIZE; + vdev.config.blk.physical_block_exp = 0; + vdev.blk_factor = VIRTIO_ISO_BLOCK_SIZE / VIRTIO_SECTOR_SIZE; + break; + case VIRTIO_ID_SCSI: + vdev.scsi_block_size = VIRTIO_ISO_BLOCK_SIZE; + break; + } } void virtio_assume_eckd(void) { - guessed_disk_nature = true; - blk_cfg.blk_size = 4096; - blk_cfg.physical_block_exp = 0; - - /* this must be here to calculate code segment position */ - blk_cfg.geometry.heads = 15; - blk_cfg.geometry.sectors = 12; + vdev.guessed_disk_nature = VIRTIO_GDN_DASD; + vdev.blk_factor = 1; + vdev.config.blk.physical_block_exp = 0; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + vdev.config.blk.blk_size = 4096; + break; + case VIRTIO_ID_SCSI: + vdev.config.blk.blk_size = vdev.scsi_block_size; + break; + } + vdev.config.blk.geometry.heads = 15; + vdev.config.blk.geometry.sectors = + virtio_eckd_sectors_for_block_size(vdev.config.blk.blk_size); } bool virtio_disk_is_scsi(void) { - if (guessed_disk_nature) { - return (virtio_get_block_size() == 512); + if (vdev.guessed_disk_nature == VIRTIO_GDN_SCSI) { + return true; } - return (blk_cfg.geometry.heads == 255) - && (blk_cfg.geometry.sectors == 63) - && (virtio_get_block_size() == 512); -} - -/* - * Other supported value pairs, if any, would need to be added here. - * Note: head count is always 15. - */ -static inline u8 virtio_eckd_sectors_for_block_size(int size) -{ - switch (size) { - case 512: - return 49; - case 1024: - return 33; - case 2048: - return 21; - case 4096: - return 12; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return (vdev.config.blk.geometry.heads == 255) + && (vdev.config.blk.geometry.sectors == 63) + && (virtio_get_block_size() == VIRTIO_SCSI_BLOCK_SIZE); + case VIRTIO_ID_SCSI: + return true; } - return 0; + return false; } bool virtio_disk_is_eckd(void) { const int block_size = virtio_get_block_size(); - if (guessed_disk_nature) { - return (block_size == 4096); + if (vdev.guessed_disk_nature == VIRTIO_GDN_DASD) { + return true; } - return (blk_cfg.geometry.heads == 15) - && (blk_cfg.geometry.sectors == - virtio_eckd_sectors_for_block_size(block_size)); + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return (vdev.config.blk.geometry.heads == 15) + && (vdev.config.blk.geometry.sectors == + virtio_eckd_sectors_for_block_size(block_size)); + case VIRTIO_ID_SCSI: + return false; + } + return false; } bool virtio_ipl_disk_is_valid(void) @@ -344,34 +435,80 @@ bool virtio_ipl_disk_is_valid(void) int virtio_get_block_size(void) { - return blk_cfg.blk_size << blk_cfg.physical_block_exp; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return vdev.config.blk.blk_size << vdev.config.blk.physical_block_exp; + case VIRTIO_ID_SCSI: + return vdev.scsi_block_size; + } + return 0; } uint8_t virtio_get_heads(void) { - return blk_cfg.geometry.heads; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return vdev.config.blk.geometry.heads; + case VIRTIO_ID_SCSI: + return vdev.guessed_disk_nature == VIRTIO_GDN_DASD + ? vdev.config.blk.geometry.heads : 255; + } + return 0; } uint8_t virtio_get_sectors(void) { - return blk_cfg.geometry.sectors; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return vdev.config.blk.geometry.sectors; + case VIRTIO_ID_SCSI: + return vdev.guessed_disk_nature == VIRTIO_GDN_DASD + ? vdev.config.blk.geometry.sectors : 63; + } + return 0; } uint64_t virtio_get_blocks(void) { - return blk_cfg.capacity / - (virtio_get_block_size() / VIRTIO_SECTOR_SIZE); + const uint64_t factor = virtio_get_block_size() / VIRTIO_SECTOR_SIZE; + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + return vdev.config.blk.capacity / factor; + case VIRTIO_ID_SCSI: + return vdev.scsi_last_block / factor; + } + return 0; } -void virtio_setup_block(struct subchannel_id schid) +static void virtio_setup_ccw(VDev *vdev) { - struct vq_info_block info; - struct vq_config_block config = {}; - - blk_cfg.blk_size = 0; /* mark "illegal" - setup started... */ - guessed_disk_nature = false; - - virtio_reset(schid); + int i, cfg_size = 0; + unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK; + + IPL_assert(virtio_is_supported(vdev->schid), "PE"); + /* device ID has been established now */ + + vdev->config.blk.blk_size = 0; /* mark "illegal" - setup started... */ + vdev->guessed_disk_nature = VIRTIO_GDN_NONE; + + run_ccw(vdev, CCW_CMD_VDEV_RESET, NULL, 0); + + switch (vdev->senseid.cu_model) { + case VIRTIO_ID_BLOCK: + vdev->nr_vqs = 1; + vdev->cmd_vr_idx = 0; + cfg_size = sizeof(vdev->config.blk); + break; + case VIRTIO_ID_SCSI: + vdev->nr_vqs = 3; + vdev->cmd_vr_idx = VR_REQUEST; + cfg_size = sizeof(vdev->config.scsi); + break; + default: + panic("Unsupported virtio device\n"); + } + IPL_assert(run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size) == 0, + "Could not get block device configuration"); /* * Skipping CCW_CMD_READ_FEAT. We're not doing anything fancy, and @@ -379,54 +516,84 @@ void virtio_setup_block(struct subchannel_id schid) * expect it. */ - config.index = 0; - if (run_ccw(schid, CCW_CMD_READ_VQ_CONF, &config, sizeof(config))) { - virtio_panic("Could not get block device VQ configuration\n"); - } - if (run_ccw(schid, CCW_CMD_READ_CONF, &blk_cfg, sizeof(blk_cfg))) { - virtio_panic("Could not get block device configuration\n"); - } - vring_init(&block, config.num, ring_area, - KVM_S390_VIRTIO_RING_ALIGN); - - info.queue = (unsigned long long) ring_area; - info.align = KVM_S390_VIRTIO_RING_ALIGN; - info.index = 0; - info.num = config.num; - block.schid = schid; - - if (!run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info))) { - virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK); + for (i = 0; i < vdev->nr_vqs; i++) { + VqInfo info = { + .queue = (unsigned long long) ring_area + (i * VIRTIO_RING_SIZE), + .align = KVM_S390_VIRTIO_RING_ALIGN, + .index = i, + .num = 0, + }; + VqConfig config = { + .index = i, + .num = 0, + }; + + IPL_assert( + run_ccw(vdev, CCW_CMD_READ_VQ_CONF, &config, sizeof(config)) == 0, + "Could not get block device VQ configuration"); + info.num = config.num; + vring_init(&vdev->vrings[i], &info); + vdev->vrings[i].schid = vdev->schid; + IPL_assert(run_ccw(vdev, CCW_CMD_SET_VQ, &info, sizeof(info)) == 0, + "Cannot set VQ info"); } + IPL_assert( + run_ccw(vdev, CCW_CMD_WRITE_STATUS, &status, sizeof(status)) == 0, + "Could not write status to host"); +} - if (!virtio_ipl_disk_is_valid()) { - /* make sure all getters but blocksize return 0 for invalid IPL disk */ - memset(&blk_cfg, 0, sizeof(blk_cfg)); - virtio_assume_scsi(); +void virtio_setup_device(SubChannelId schid) +{ + vdev.schid = schid; + virtio_setup_ccw(&vdev); + + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + sclp_print("Using virtio-blk.\n"); + if (!virtio_ipl_disk_is_valid()) { + /* make sure all getters but blocksize return 0 for + * invalid IPL disk + */ + memset(&vdev.config.blk, 0, sizeof(vdev.config.blk)); + virtio_assume_scsi(); + } + break; + case VIRTIO_ID_SCSI: + IPL_assert(vdev.config.scsi.sense_size == VIRTIO_SCSI_SENSE_SIZE, + "Config: sense size mismatch"); + IPL_assert(vdev.config.scsi.cdb_size == VIRTIO_SCSI_CDB_SIZE, + "Config: CDB size mismatch"); + + sclp_print("Using virtio-scsi.\n"); + virtio_scsi_setup(&vdev); + break; + default: + panic("\n! No IPL device available !\n"); } } -bool virtio_is_blk(struct subchannel_id schid) +bool virtio_is_supported(SubChannelId schid) { - int r; - struct senseid senseid = {}; - + vdev.schid = schid; + memset(&vdev.senseid, 0, sizeof(vdev.senseid)); /* run sense id command */ - r = run_ccw(schid, CCW_CMD_SENSE_ID, &senseid, sizeof(senseid)); - if (r) { + if (run_ccw(&vdev, CCW_CMD_SENSE_ID, &vdev.senseid, sizeof(vdev.senseid))) { return false; } - if ((senseid.cu_type != 0x3832) || (senseid.cu_model != VIRTIO_ID_BLOCK)) { - return false; + if (vdev.senseid.cu_type == 0x3832) { + switch (vdev.senseid.cu_model) { + case VIRTIO_ID_BLOCK: + case VIRTIO_ID_SCSI: + return true; + } } - - return true; + return false; } int enable_mss_facility(void) { int ret; - struct chsc_area_sda *sda_area = (struct chsc_area_sda *) chsc_page; + ChscAreaSda *sda_area = (ChscAreaSda *) chsc_page; memset(sda_area, 0, PAGE_SIZE); sda_area->request.length = 0x0400; diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h index afa01a885b..3c6e91510e 100644 --- a/pc-bios/s390-ccw/virtio.h +++ b/pc-bios/s390-ccw/virtio.h @@ -23,49 +23,58 @@ /* We've given up on this device. */ #define VIRTIO_CONFIG_S_FAILED 0x80 -enum virtio_dev_type { +enum VirtioDevType { VIRTIO_ID_NET = 1, VIRTIO_ID_BLOCK = 2, VIRTIO_ID_CONSOLE = 3, VIRTIO_ID_BALLOON = 5, + VIRTIO_ID_SCSI = 8, }; - -struct virtio_dev_header { - enum virtio_dev_type type : 8; - u8 num_vq; - u8 feature_len; - u8 config_len; - u8 status; - u8 vqconfig[]; +typedef enum VirtioDevType VirtioDevType; + +struct VirtioDevHeader { + VirtioDevType type:8; + uint8_t num_vq; + uint8_t feature_len; + uint8_t config_len; + uint8_t status; + uint8_t vqconfig[]; } __attribute__((packed)); +typedef struct VirtioDevHeader VirtioDevHeader; -struct virtio_vqconfig { - u64 token; - u64 address; - u16 num; - u8 pad[6]; +struct VirtioVqConfig { + uint64_t token; + uint64_t address; + uint16_t num; + uint8_t pad[6]; } __attribute__((packed)); +typedef struct VirtioVqConfig VirtioVqConfig; -struct vq_info_block { - u64 queue; - u32 align; - u16 index; - u16 num; +struct VqInfo { + uint64_t queue; + uint32_t align; + uint16_t index; + uint16_t num; } __attribute__((packed)); +typedef struct VqInfo VqInfo; -struct vq_config_block { - u16 index; - u16 num; +struct VqConfig { + uint16_t index; + uint16_t num; } __attribute__((packed)); +typedef struct VqConfig VqConfig; -struct virtio_dev { - struct virtio_dev_header *header; - struct virtio_vqconfig *vqconfig; +struct VirtioDev { + VirtioDevHeader *header; + VirtioVqConfig *vqconfig; char *host_features; char *guest_features; char *config; }; +typedef struct VirtioDev VirtioDev; +#define VIRTIO_RING_SIZE (PAGE_SIZE * 8) +#define VIRTIO_MAX_VQS 3 #define KVM_S390_VIRTIO_RING_ALIGN 4096 #define VRING_USED_F_NO_NOTIFY 1 @@ -81,46 +90,53 @@ struct virtio_dev { #define VRING_HIDDEN_IS_CHAIN 256 /* Virtio ring descriptors: 16 bytes. These can chain together via "next". */ -struct vring_desc { +struct VRingDesc { /* Address (guest-physical). */ - u64 addr; + uint64_t addr; /* Length. */ - u32 len; + uint32_t len; /* The flags as indicated above. */ - u16 flags; + uint16_t flags; /* We chain unused descriptors via this, too */ - u16 next; + uint16_t next; } __attribute__((packed)); +typedef struct VRingDesc VRingDesc; -struct vring_avail { - u16 flags; - u16 idx; - u16 ring[]; +struct VRingAvail { + uint16_t flags; + uint16_t idx; + uint16_t ring[]; } __attribute__((packed)); +typedef struct VRingAvail VRingAvail; -/* u32 is used here for ids for padding reasons. */ -struct vring_used_elem { +/* uint32_t is used here for ids for padding reasons. */ +struct VRingUsedElem { /* Index of start of used descriptor chain. */ - u32 id; + uint32_t id; /* Total length of the descriptor chain which was used (written to) */ - u32 len; + uint32_t len; } __attribute__((packed)); +typedef struct VRingUsedElem VRingUsedElem; -struct vring_used { - u16 flags; - u16 idx; - struct vring_used_elem ring[]; +struct VRingUsed { + uint16_t flags; + uint16_t idx; + VRingUsedElem ring[]; } __attribute__((packed)); +typedef struct VRingUsed VRingUsed; -struct vring { +struct VRing { unsigned int num; int next_idx; int used_idx; - struct vring_desc *desc; - struct vring_avail *avail; - struct vring_used *used; - struct subchannel_id schid; + VRingDesc *desc; + VRingAvail *avail; + VRingUsed *used; + SubChannelId schid; + long cookie; + int id; }; +typedef struct VRing VRing; /*********************************************** @@ -152,39 +168,49 @@ struct vring { #define VIRTIO_BLK_T_BARRIER 0x80000000 /* This is the first element of the read scatter-gather list. */ -struct virtio_blk_outhdr { +struct VirtioBlkOuthdr { /* VIRTIO_BLK_T* */ - u32 type; + uint32_t type; /* io priority. */ - u32 ioprio; + uint32_t ioprio; /* Sector (ie. 512 byte offset) */ - u64 sector; + uint64_t sector; }; +typedef struct VirtioBlkOuthdr VirtioBlkOuthdr; -typedef struct VirtioBlkConfig { - u64 capacity; /* in 512-byte sectors */ - u32 size_max; /* max segment size (if VIRTIO_BLK_F_SIZE_MAX) */ - u32 seg_max; /* max number of segments (if VIRTIO_BLK_F_SEG_MAX) */ +struct VirtioBlkConfig { + uint64_t capacity; /* in 512-byte sectors */ + uint32_t size_max; /* max segment size (if VIRTIO_BLK_F_SIZE_MAX) */ + uint32_t seg_max; /* max number of segments (if VIRTIO_BLK_F_SEG_MAX) */ - struct virtio_blk_geometry { - u16 cylinders; - u8 heads; - u8 sectors; + struct VirtioBlkGeometry { + uint16_t cylinders; + uint8_t heads; + uint8_t sectors; } geometry; /* (if VIRTIO_BLK_F_GEOMETRY) */ - u32 blk_size; /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ + uint32_t blk_size; /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ /* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */ - u8 physical_block_exp; /* exponent for physical block per logical block */ - u8 alignment_offset; /* alignment offset in logical blocks */ - u16 min_io_size; /* min I/O size without performance penalty + uint8_t physical_block_exp; /* exponent for physical blk per logical blk */ + uint8_t alignment_offset; /* alignment offset in logical blocks */ + uint16_t min_io_size; /* min I/O size without performance penalty in logical blocks */ - u32 opt_io_size; /* optimal sustained I/O size in logical blocks */ + uint32_t opt_io_size; /* optimal sustained I/O size in logical blks */ + + uint8_t wce; /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */ +} __attribute__((packed)); +typedef struct VirtioBlkConfig VirtioBlkConfig; - u8 wce; /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */ -} __attribute__((packed)) VirtioBlkConfig; +enum guessed_disk_nature_type { + VIRTIO_GDN_NONE = 0, + VIRTIO_GDN_DASD = 1, + VIRTIO_GDN_CDROM = 2, + VIRTIO_GDN_SCSI = 3, +}; +typedef enum guessed_disk_nature_type VirtioGDN; -bool virtio_guessed_disk_nature(void); +VirtioGDN virtio_guessed_disk_nature(void); void virtio_assume_scsi(void); void virtio_assume_eckd(void); void virtio_assume_iso9660(void); @@ -199,10 +225,68 @@ extern uint64_t virtio_get_blocks(void); extern int virtio_read_many(ulong sector, void *load_addr, int sec_num); #define VIRTIO_SECTOR_SIZE 512 +#define VIRTIO_ISO_BLOCK_SIZE 2048 +#define VIRTIO_SCSI_BLOCK_SIZE 512 static inline ulong virtio_sector_adjust(ulong sector) { return sector * (virtio_get_block_size() / VIRTIO_SECTOR_SIZE); } +struct VirtioScsiConfig { + uint32_t num_queues; + uint32_t seg_max; + uint32_t max_sectors; + uint32_t cmd_per_lun; + uint32_t event_info_size; + uint32_t sense_size; + uint32_t cdb_size; + uint16_t max_channel; + uint16_t max_target; + uint32_t max_lun; +} __attribute__((packed)); +typedef struct VirtioScsiConfig VirtioScsiConfig; + +struct ScsiDevice { + uint16_t channel; /* Always 0 in QEMU */ + uint16_t target; /* will be scanned over */ + uint32_t lun; /* will be reported */ +}; +typedef struct ScsiDevice ScsiDevice; + +struct VDev { + int nr_vqs; + VRing *vrings; + int cmd_vr_idx; + void *ring_area; + long wait_reply_timeout; + VirtioGDN guessed_disk_nature; + SubChannelId schid; + SenseId senseid; + union { + VirtioBlkConfig blk; + VirtioScsiConfig scsi; + } config; + ScsiDevice *scsi_device; + bool is_cdrom; + int scsi_block_size; + int blk_factor; + uint64_t scsi_last_block; + uint32_t scsi_dev_cyls; + uint8_t scsi_dev_heads; +}; +typedef struct VDev VDev; + +VDev *virtio_get_device(void); +VirtioDevType virtio_get_device_type(void); + +struct VirtioCmd { + void *data; + int size; + int flags; +}; +typedef struct VirtioCmd VirtioCmd; + +int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd); + #endif /* VIRTIO_H */ |