aboutsummaryrefslogtreecommitdiff
path: root/pc-bios
diff options
context:
space:
mode:
Diffstat (limited to 'pc-bios')
-rw-r--r--pc-bios/s390-ccw.imgbin17760 -> 26424 bytes
-rw-r--r--pc-bios/s390-ccw/Makefile2
-rw-r--r--pc-bios/s390-ccw/bootmap.c129
-rw-r--r--pc-bios/s390-ccw/bootmap.h9
-rw-r--r--pc-bios/s390-ccw/main.c25
-rw-r--r--pc-bios/s390-ccw/s390-ccw.h54
-rw-r--r--pc-bios/s390-ccw/scsi.h184
-rw-r--r--pc-bios/s390-ccw/virtio-scsi.c342
-rw-r--r--pc-bios/s390-ccw/virtio-scsi.h72
-rw-r--r--pc-bios/s390-ccw/virtio.c479
-rw-r--r--pc-bios/s390-ccw/virtio.h218
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 differ
diff --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 */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-16 23:02:56 +0000