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seabios/src/hw/pvscsi.c

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// QEMU VMWARE Paravirtualized SCSI boot support.
//
// Copyright (c) 2013 Ravello Systems LTD (http://ravellosystems.com)
//
// Authors:
// Evgeny Budilovsky <evgeny.budilovsky@ravellosystems.com>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "block.h" // struct drive_s
#include "blockcmd.h" // scsi_drive_setup
#include "config.h" // CONFIG_*
#include "malloc.h" // free
#include "memmap.h" // PAGE_SHIFT, virt_to_phys
#include "output.h" // dprintf
#include "pcidevice.h" // foreachpci
#include "pci_ids.h" // PCI_DEVICE_ID_VMWARE_PVSCSI
#include "pci_regs.h" // PCI_VENDOR_ID
#include "pvscsi.h" // pvscsi_setup
#include "stacks.h" // run_thread
#include "std/disk.h" // DISK_RET_SUCCESS
#include "string.h" // memset
#include "util.h" // usleep
#include "x86.h" // writel
#define MASK(n) ((1 << (n)) - 1)
#define SIMPLE_QUEUE_TAG 0x20
#define PVSCSI_INTR_CMPL_0 (1 << 0)
#define PVSCSI_INTR_CMPL_1 (1 << 1)
#define PVSCSI_INTR_CMPL_MASK MASK(2)
#define PVSCSI_INTR_MSG_0 (1 << 2)
#define PVSCSI_INTR_MSG_1 (1 << 3)
#define PVSCSI_INTR_MSG_MASK (MASK(2) << 2)
#define PVSCSI_INTR_ALL_SUPPORTED MASK(4)
#define PVSCSI_FLAG_CMD_WITH_SG_LIST (1 << 0)
#define PVSCSI_FLAG_CMD_OUT_OF_BAND_CDB (1 << 1)
#define PVSCSI_FLAG_CMD_DIR_NONE (1 << 2)
#define PVSCSI_FLAG_CMD_DIR_TOHOST (1 << 3)
#define PVSCSI_FLAG_CMD_DIR_TODEVICE (1 << 4)
enum PVSCSIRegOffset {
PVSCSI_REG_OFFSET_COMMAND = 0x0,
PVSCSI_REG_OFFSET_COMMAND_DATA = 0x4,
PVSCSI_REG_OFFSET_COMMAND_STATUS = 0x8,
PVSCSI_REG_OFFSET_LAST_STS_0 = 0x100,
PVSCSI_REG_OFFSET_LAST_STS_1 = 0x104,
PVSCSI_REG_OFFSET_LAST_STS_2 = 0x108,
PVSCSI_REG_OFFSET_LAST_STS_3 = 0x10c,
PVSCSI_REG_OFFSET_INTR_STATUS = 0x100c,
PVSCSI_REG_OFFSET_INTR_MASK = 0x2010,
PVSCSI_REG_OFFSET_KICK_NON_RW_IO = 0x3014,
PVSCSI_REG_OFFSET_DEBUG = 0x3018,
PVSCSI_REG_OFFSET_KICK_RW_IO = 0x4018,
};
enum PVSCSICommands {
PVSCSI_CMD_FIRST = 0,
PVSCSI_CMD_ADAPTER_RESET = 1,
PVSCSI_CMD_ISSUE_SCSI = 2,
PVSCSI_CMD_SETUP_RINGS = 3,
PVSCSI_CMD_RESET_BUS = 4,
PVSCSI_CMD_RESET_DEVICE = 5,
PVSCSI_CMD_ABORT_CMD = 6,
PVSCSI_CMD_CONFIG = 7,
PVSCSI_CMD_SETUP_MSG_RING = 8,
PVSCSI_CMD_DEVICE_UNPLUG = 9,
PVSCSI_CMD_LAST = 10
};
#define PVSCSI_SETUP_RINGS_MAX_NUM_PAGES 32
struct PVSCSICmdDescSetupRings {
u32 reqRingNumPages;
u32 cmpRingNumPages;
u64 ringsStatePPN;
u64 reqRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
u64 cmpRingPPNs[PVSCSI_SETUP_RINGS_MAX_NUM_PAGES];
} PACKED;
struct PVSCSIRingCmpDesc {
u64 context;
u64 dataLen;
u32 senseLen;
u16 hostStatus;
u16 scsiStatus;
u32 pad[2];
} PACKED;
struct PVSCSIRingsState {
u32 reqProdIdx;
u32 reqConsIdx;
u32 reqNumEntriesLog2;
u32 cmpProdIdx;
u32 cmpConsIdx;
u32 cmpNumEntriesLog2;
u8 pad[104];
u32 msgProdIdx;
u32 msgConsIdx;
u32 msgNumEntriesLog2;
} PACKED;
struct PVSCSIRingReqDesc {
u64 context;
u64 dataAddr;
u64 dataLen;
u64 senseAddr;
u32 senseLen;
u32 flags;
u8 cdb[16];
u8 cdbLen;
u8 lun[8];
u8 tag;
u8 bus;
u8 target;
u8 vcpuHint;
u8 unused[59];
} PACKED;
struct pvscsi_ring_dsc_s {
struct PVSCSIRingsState *ring_state;
struct PVSCSIRingReqDesc *ring_reqs;
struct PVSCSIRingCmpDesc *ring_cmps;
};
struct pvscsi_lun_s {
struct drive_s drive;
void *iobase;
u8 target;
u8 lun;
struct pvscsi_ring_dsc_s *ring_dsc;
};
static void
pvscsi_write_cmd_desc(void *iobase, u32 cmd, const void *desc, size_t len)
{
const u32 *ptr = desc;
size_t i;
len /= sizeof(*ptr);
writel(iobase + PVSCSI_REG_OFFSET_COMMAND, cmd);
for (i = 0; i < len; i++)
writel(iobase + PVSCSI_REG_OFFSET_COMMAND_DATA, ptr[i]);
}
static void
pvscsi_kick_rw_io(void *iobase)
{
writel(iobase + PVSCSI_REG_OFFSET_KICK_RW_IO, 0);
}
static void
pvscsi_wait_intr_cmpl(void *iobase)
{
while (!(readl(iobase + PVSCSI_REG_OFFSET_INTR_STATUS) & PVSCSI_INTR_CMPL_MASK))
usleep(5);
writel(iobase + PVSCSI_REG_OFFSET_INTR_STATUS, PVSCSI_INTR_CMPL_MASK);
}
static void
pvscsi_init_rings(void *iobase, struct pvscsi_ring_dsc_s **ring_dsc)
{
struct PVSCSICmdDescSetupRings cmd = {0,};
struct pvscsi_ring_dsc_s *dsc = malloc_high(sizeof(*dsc));
if (!dsc) {
warn_noalloc();
return;
}
dsc->ring_state =
(struct PVSCSIRingsState *)memalign_high(PAGE_SIZE, PAGE_SIZE);
dsc->ring_reqs =
(struct PVSCSIRingReqDesc *)memalign_high(PAGE_SIZE, PAGE_SIZE);
dsc->ring_cmps =
(struct PVSCSIRingCmpDesc *)memalign_high(PAGE_SIZE, PAGE_SIZE);
if (!dsc->ring_state || !dsc->ring_reqs || !dsc->ring_cmps) {
warn_noalloc();
return;
}
memset(dsc->ring_state, 0, PAGE_SIZE);
memset(dsc->ring_reqs, 0, PAGE_SIZE);
memset(dsc->ring_cmps, 0, PAGE_SIZE);
cmd.reqRingNumPages = 1;
cmd.cmpRingNumPages = 1;
cmd.ringsStatePPN = virt_to_phys(dsc->ring_state) >> PAGE_SHIFT;
cmd.reqRingPPNs[0] = virt_to_phys(dsc->ring_reqs) >> PAGE_SHIFT;
cmd.cmpRingPPNs[0] = virt_to_phys(dsc->ring_cmps) >> PAGE_SHIFT;
pvscsi_write_cmd_desc(iobase, PVSCSI_CMD_SETUP_RINGS,
&cmd, sizeof(cmd));
*ring_dsc = dsc;
}
static u32
pvscsi_get_rsp(struct PVSCSIRingsState *s,
struct PVSCSIRingCmpDesc *rsp)
{
u32 status = rsp->hostStatus;
s->cmpConsIdx = s->cmpConsIdx + 1;
return status;
}
int
pvscsi_process_op(struct disk_op_s *op)
{
if (!CONFIG_PVSCSI)
return DISK_RET_EBADTRACK;
struct pvscsi_lun_s *plun =
container_of(op->drive_fl, struct pvscsi_lun_s, drive);
struct pvscsi_ring_dsc_s *ring_dsc = plun->ring_dsc;
struct PVSCSIRingsState *s = ring_dsc->ring_state;
u32 req_entries = s->reqNumEntriesLog2;
u32 cmp_entries = s->cmpNumEntriesLog2;
struct PVSCSIRingReqDesc *req;
struct PVSCSIRingCmpDesc *rsp;
u32 status;
if (s->reqProdIdx - s->cmpConsIdx >= 1 << req_entries) {
dprintf(1, "pvscsi: ring full: reqProdIdx=%d cmpConsIdx=%d\n",
s->reqProdIdx, s->cmpConsIdx);
return DISK_RET_EBADTRACK;
}
req = ring_dsc->ring_reqs + (s->reqProdIdx & MASK(req_entries));
int blocksize = scsi_fill_cmd(op, req->cdb, 16);
if (blocksize < 0)
return default_process_op(op);
req->bus = 0;
req->target = plun->target;
memset(req->lun, 0, sizeof(req->lun));
req->lun[1] = plun->lun;
req->senseLen = 0;
req->senseAddr = 0;
req->cdbLen = 16;
req->vcpuHint = 0;
req->tag = SIMPLE_QUEUE_TAG;
req->flags = scsi_is_read(op) ?
PVSCSI_FLAG_CMD_DIR_TOHOST : PVSCSI_FLAG_CMD_DIR_TODEVICE;
req->dataLen = op->count * blocksize;
req->dataAddr = (u32)op->buf_fl;
s->reqProdIdx = s->reqProdIdx + 1;
pvscsi_kick_rw_io(plun->iobase);
pvscsi_wait_intr_cmpl(plun->iobase);
rsp = ring_dsc->ring_cmps + (s->cmpConsIdx & MASK(cmp_entries));
status = pvscsi_get_rsp(s, rsp);
return status == 0 ? DISK_RET_SUCCESS : DISK_RET_EBADTRACK;
}
static int
pvscsi_add_lun(struct pci_device *pci, void *iobase,
struct pvscsi_ring_dsc_s *ring_dsc, u8 target, u8 lun)
{
struct pvscsi_lun_s *plun = malloc_fseg(sizeof(*plun));
if (!plun) {
warn_noalloc();
return -1;
}
memset(plun, 0, sizeof(*plun));
plun->drive.type = DTYPE_PVSCSI;
plun->drive.cntl_id = pci->bdf;
plun->target = target;
plun->lun = lun;
plun->iobase = iobase;
plun->ring_dsc = ring_dsc;
boot_lchs_find_scsi_device(pci, target, lun, &(plun->drive.lchs));
char *name = znprintf(MAXDESCSIZE, "pvscsi %pP %d:%d", pci, target, lun);
int prio = bootprio_find_scsi_device(pci, target, lun);
int ret = scsi_drive_setup(&plun->drive, name, prio);
free(name);
if (ret)
goto fail;
return 0;
fail:
free(plun);
return -1;
}
static void
pvscsi_scan_target(struct pci_device *pci, void *iobase,
struct pvscsi_ring_dsc_s *ring_dsc, u8 target)
{
/* pvscsi has no more than a single lun per target */
pvscsi_add_lun(pci, iobase, ring_dsc, target, 0);
}
static void
init_pvscsi(void *data)
{
struct pci_device *pci = data;
void *iobase = pci_enable_membar(pci, PCI_BASE_ADDRESS_0);
if (!iobase)
return;
pci_enable_busmaster(pci);
dprintf(1, "found pvscsi at %pP, io @ %p\n", pci, iobase);
pvscsi_write_cmd_desc(iobase, PVSCSI_CMD_ADAPTER_RESET, NULL, 0);
struct pvscsi_ring_dsc_s *ring_dsc = NULL;
pvscsi_init_rings(iobase, &ring_dsc);
int i;
for (i = 0; i < 64; i++)
pvscsi_scan_target(pci, iobase, ring_dsc, i);
}
void
pvscsi_setup(void)
{
ASSERT32FLAT();
if (! CONFIG_PVSCSI)
return;
dprintf(3, "init pvscsi\n");
struct pci_device *pci;
foreachpci(pci) {
if (pci->vendor != PCI_VENDOR_ID_VMWARE
|| pci->device != PCI_DEVICE_ID_VMWARE_PVSCSI)
continue;
run_thread(init_pvscsi, pci);
}
}
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