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// Code for handling usb attached scsi devices.
//
// only usb 2.0 for now.
//
// once we have xhci driver with usb 3.0 support this must
// be updated to use usb3 streams so booting from usb3
// devices actually works.
//
// Authors:
// Gerd Hoffmann <kraxel@redhat.com>
//
// based on usb-msc.c which is written by:
// Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "util.h" // dprintf
#include "config.h" // CONFIG_USB_UAS
#include "usb.h" // struct usb_s
#include "biosvar.h" // GET_GLOBAL
#include "blockcmd.h" // cdb_read
#include "disk.h" // DTYPE_UAS
#include "boot.h" // bootprio_find_usb
#include "usb-uas.h" // usb_uas_init
#define UAS_UI_COMMAND 0x01
#define UAS_UI_SENSE 0x03
#define UAS_UI_RESPONSE 0x04
#define UAS_UI_TASK_MGMT 0x05
#define UAS_UI_READ_READY 0x06
#define UAS_UI_WRITE_READY 0x07
#define UAS_PIPE_ID_COMMAND 0x01
#define UAS_PIPE_ID_STATUS 0x02
#define UAS_PIPE_ID_DATA_IN 0x03
#define UAS_PIPE_ID_DATA_OUT 0x04
typedef struct {
u8 id;
u8 reserved;
u16 tag;
} PACKED uas_ui_header;
typedef struct {
u8 prio_taskattr; /* 6:3 priority, 2:0 task attribute */
u8 reserved_1;
u8 add_cdb_length; /* 7:2 additional adb length (dwords) */
u8 reserved_2;
u8 lun[8];
u8 cdb[16];
u8 add_cdb[];
} PACKED uas_ui_command;
typedef struct {
u16 status_qualifier;
u8 status;
u8 reserved[7];
u16 sense_length;
u8 sense_data[18];
} PACKED uas_ui_sense;
typedef struct {
u16 add_response_info;
u8 response_code;
} PACKED uas_ui_response;
typedef struct {
u8 function;
u8 reserved;
u16 task_tag;
u8 lun[8];
} PACKED uas_ui_task_mgmt;
typedef struct {
uas_ui_header hdr;
union {
uas_ui_command command;
uas_ui_sense sense;
uas_ui_task_mgmt task;
uas_ui_response response;
};
} PACKED uas_ui;
struct uasdrive_s {
struct drive_s drive;
struct usb_pipe *command, *status, *data_in, *data_out;
int lun;
};
int
uas_cmd_data(struct disk_op_s *op, void *cdbcmd, u16 blocksize)
{
if (!CONFIG_USB_UAS)
return DISK_RET_EBADTRACK;
struct uasdrive_s *drive = container_of(
op->drive_g, struct uasdrive_s, drive);
uas_ui ui;
memset(&ui, 0, sizeof(ui));
ui.hdr.id = UAS_UI_COMMAND;
ui.hdr.tag = 0xdead;
ui.command.lun[1] = drive->lun;
memcpy(ui.command.cdb, cdbcmd, sizeof(ui.command.cdb));
int ret = usb_send_bulk(GET_GLOBAL(drive->command),
USB_DIR_OUT, MAKE_FLATPTR(GET_SEG(SS), &ui),
sizeof(ui.hdr) + sizeof(ui.command));
if (ret) {
dprintf(1, "uas: command send fail");
goto fail;
}
memset(&ui, 0xff, sizeof(ui));
ret = usb_send_bulk(GET_GLOBAL(drive->status),
USB_DIR_IN, MAKE_FLATPTR(GET_SEG(SS), &ui), sizeof(ui));
if (ret) {
dprintf(1, "uas: status recv fail");
goto fail;
}
switch (ui.hdr.id) {
case UAS_UI_SENSE:
goto have_sense;
case UAS_UI_READ_READY:
ret = usb_send_bulk(GET_GLOBAL(drive->data_in),
USB_DIR_IN, op->buf_fl, op->count * blocksize);
if (ret) {
dprintf(1, "uas: data read fail");
goto fail;
}
break;
case UAS_UI_WRITE_READY:
ret = usb_send_bulk(GET_GLOBAL(drive->data_out),
USB_DIR_OUT, op->buf_fl, op->count * blocksize);
if (ret) {
dprintf(1, "uas: data write fail");
goto fail;
}
break;
default:
dprintf(1, "uas: unknown status ui id %d", ui.hdr.id);
goto fail;
}
memset(&ui, 0xff, sizeof(ui));
ret = usb_send_bulk(GET_GLOBAL(drive->status),
USB_DIR_IN, MAKE_FLATPTR(GET_SEG(SS), &ui), sizeof(ui));
if (ret) {
dprintf(1, "uas: status recv fail");
goto fail;
}
if (ui.hdr.id != UAS_UI_SENSE) {
dprintf(1, "uas: expected sense ui, got ui id %d", ui.hdr.id);
goto fail;
}
have_sense:
if (ui.sense.status == 0) {
return DISK_RET_SUCCESS;
}
fail:
return DISK_RET_EBADTRACK;
}
static int
uas_lun_setup(struct usbdevice_s *usbdev,
struct usb_pipe *command, struct usb_pipe *status,
struct usb_pipe *data_in, struct usb_pipe *data_out,
int lun)
{
// Allocate drive structure.
struct uasdrive_s *drive = malloc_fseg(sizeof(*drive));
if (!drive) {
warn_noalloc();
return -1;
}
memset(drive, 0, sizeof(*drive));
drive->drive.type = DTYPE_UAS;
drive->command = command;
drive->status = status;
drive->data_in = data_in;
drive->data_out = data_out;
drive->lun = lun;
int prio = bootprio_find_usb(usbdev, lun);
int ret = scsi_drive_setup(&drive->drive, "USB UAS", prio);
if (ret) {
free(drive);
return -1;
}
return 0;
}
int
usb_uas_setup(struct usbdevice_s *usbdev)
{
if (!CONFIG_USB_UAS)
return -1;
// Verify right kind of device
struct usb_interface_descriptor *iface = usbdev->iface;
if (iface->bInterfaceSubClass != US_SC_SCSI ||
iface->bInterfaceProtocol != US_PR_UAS) {
dprintf(1, "Unsupported UAS device (subclass=%02x proto=%02x)\n"
, iface->bInterfaceSubClass, iface->bInterfaceProtocol);
return -1;
}
/* find & allocate pipes */
struct usb_endpoint_descriptor *ep = NULL;
struct usb_pipe *command = NULL;
struct usb_pipe *status = NULL;
struct usb_pipe *data_in = NULL;
struct usb_pipe *data_out = NULL;
u8 *desc = (u8*)iface;
while (desc) {
desc += desc[0];
switch (desc[1]) {
case USB_DT_ENDPOINT:
ep = (void*)desc;
break;
case 0x24:
switch (desc[2]) {
case UAS_PIPE_ID_COMMAND:
command = usb_alloc_pipe(usbdev, ep);
break;
case UAS_PIPE_ID_STATUS:
status = usb_alloc_pipe(usbdev, ep);
break;
case UAS_PIPE_ID_DATA_IN:
data_in = usb_alloc_pipe(usbdev, ep);
break;
case UAS_PIPE_ID_DATA_OUT:
data_out = usb_alloc_pipe(usbdev, ep);
break;
default:
goto fail;
}
break;
default:
desc = NULL;
break;
}
}
if (!command || !status || !data_in || !data_out)
goto fail;
/* TODO: send REPORT LUNS. For now, only LUN 0 is recognized. */
int ret = uas_lun_setup(usbdev, command, status, data_in, data_out, 0);
if (ret < 0) {
dprintf(1, "Unable to configure UAS drive.\n");
goto fail;
}
return 0;
fail:
free_pipe(command);
free_pipe(status);
free_pipe(data_in);
free_pipe(data_out);
return -1;
}
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