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Diffstat (limited to 'hw/usb-msd.c')
-rw-r--r--hw/usb-msd.c213
1 files changed, 156 insertions, 57 deletions
diff --git a/hw/usb-msd.c b/hw/usb-msd.c
index e4cfca0..4530a1c 100644
--- a/hw/usb-msd.c
+++ b/hw/usb-msd.c
@@ -32,8 +32,12 @@ enum USBMSDMode {
typedef struct {
USBDevice dev;
enum USBMSDMode mode;
+ uint32_t scsi_len;
+ uint8_t *scsi_buf;
+ uint32_t usb_len;
+ uint8_t *usb_buf;
uint32_t data_len;
- uint32_t transfer_len;
+ uint32_t residue;
uint32_t tag;
BlockDriverState *bs;
SCSIDevice *scsi_dev;
@@ -42,6 +46,23 @@ typedef struct {
USBPacket *packet;
} MSDState;
+struct usb_msd_cbw {
+ uint32_t sig;
+ uint32_t tag;
+ uint32_t data_len;
+ uint8_t flags;
+ uint8_t lun;
+ uint8_t cmd_len;
+ uint8_t cmd[16];
+};
+
+struct usb_msd_csw {
+ uint32_t sig;
+ uint32_t tag;
+ uint32_t residue;
+ uint8_t status;
+};
+
static const uint8_t qemu_msd_dev_descriptor[] = {
0x12, /* u8 bLength; */
0x01, /* u8 bDescriptorType; Device */
@@ -107,26 +128,90 @@ static const uint8_t qemu_msd_config_descriptor[] = {
0x00 /* u8 ep_bInterval; */
};
-static void usb_msd_command_complete(void *opaque, uint32_t reason, int fail)
+static void usb_msd_copy_data(MSDState *s)
+{
+ uint32_t len;
+ len = s->usb_len;
+ if (len > s->scsi_len)
+ len = s->scsi_len;
+ if (s->mode == USB_MSDM_DATAIN) {
+ memcpy(s->usb_buf, s->scsi_buf, len);
+ } else {
+ memcpy(s->scsi_buf, s->usb_buf, len);
+ }
+ s->usb_len -= len;
+ s->scsi_len -= len;
+ s->usb_buf += len;
+ s->scsi_buf += len;
+ s->data_len -= len;
+ if (s->scsi_len == 0) {
+ if (s->mode == USB_MSDM_DATAIN) {
+ scsi_read_data(s->scsi_dev, s->tag);
+ } else if (s->mode == USB_MSDM_DATAOUT) {
+ scsi_write_data(s->scsi_dev, s->tag);
+ }
+ }
+}
+
+static void usb_msd_send_status(MSDState *s)
+{
+ struct usb_msd_csw csw;
+
+ csw.sig = cpu_to_le32(0x53425355);
+ csw.tag = cpu_to_le32(s->tag);
+ csw.residue = s->residue;
+ csw.status = s->result;
+ memcpy(s->usb_buf, &csw, 13);
+}
+
+static void usb_msd_command_complete(void *opaque, int reason, uint32_t tag,
+ uint32_t arg)
{
MSDState *s = (MSDState *)opaque;
- USBPacket *p;
+ USBPacket *p = s->packet;
- s->data_len -= s->transfer_len;
- s->transfer_len = 0;
+ if (tag != s->tag) {
+ fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", tag);
+ }
if (reason == SCSI_REASON_DONE) {
- DPRINTF("Command complete %d\n", fail);
- s->result = fail;
- s->mode = USB_MSDM_CSW;
+ DPRINTF("Command complete %d\n", arg);
+ s->residue = s->data_len;
+ s->result = arg != 0;
+ if (s->packet) {
+ if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
+ /* A deferred packet with no write data remaining must be
+ the status read packet. */
+ usb_msd_send_status(s);
+ s->mode = USB_MSDM_CBW;
+ } else {
+ if (s->data_len) {
+ s->data_len -= s->usb_len;
+ if (s->mode == USB_MSDM_DATAIN)
+ memset(s->usb_buf, 0, s->usb_len);
+ s->usb_len = 0;
+ }
+ if (s->data_len == 0)
+ s->mode = USB_MSDM_CSW;
+ }
+ s->packet = NULL;
+ usb_packet_complete(p);
+ } else if (s->data_len == 0) {
+ s->mode = USB_MSDM_CSW;
+ }
+ return;
}
- if (s->packet) {
- /* Set s->packet to NULL before calling usb_packet_complete because
- annother request may be issues before usb_packet_complete returns.
- */
- DPRINTF("Packet complete %p\n", p);
- p = s->packet;
- s->packet = NULL;
- usb_packet_complete(p);
+ s->scsi_len = arg;
+ s->scsi_buf = scsi_get_buf(s->scsi_dev, tag);
+ if (p) {
+ usb_msd_copy_data(s);
+ if (s->usb_len == 0) {
+ /* Set s->packet to NULL before calling usb_packet_complete
+ because annother request may be issued before
+ usb_packet_complete returns. */
+ DPRINTF("Packet complete %p\n", p);
+ s->packet = NULL;
+ usb_packet_complete(p);
+ }
}
}
@@ -251,28 +336,12 @@ static int usb_msd_handle_control(USBDevice *dev, int request, int value,
return ret;
}
-struct usb_msd_cbw {
- uint32_t sig;
- uint32_t tag;
- uint32_t data_len;
- uint8_t flags;
- uint8_t lun;
- uint8_t cmd_len;
- uint8_t cmd[16];
-};
-
-struct usb_msd_csw {
- uint32_t sig;
- uint32_t tag;
- uint32_t residue;
- uint8_t status;
-};
-
static void usb_msd_cancel_io(USBPacket *p, void *opaque)
{
MSDState *s = opaque;
- scsi_cancel_io(s->scsi_dev);
+ scsi_cancel_io(s->scsi_dev, s->tag);
s->packet = NULL;
+ s->scsi_len = 0;
}
static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
@@ -280,7 +349,6 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
MSDState *s = (MSDState *)dev;
int ret = 0;
struct usb_msd_cbw cbw;
- struct usb_msd_csw csw;
uint8_t devep = p->devep;
uint8_t *data = p->data;
int len = p->len;
@@ -318,7 +386,17 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
}
DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
s->tag, cbw.flags, cbw.cmd_len, s->data_len);
+ s->residue = 0;
scsi_send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
+ /* ??? Should check that USB and SCSI data transfer
+ directions match. */
+ if (s->residue == 0) {
+ if (s->mode == USB_MSDM_DATAIN) {
+ scsi_read_data(s->scsi_dev, s->tag);
+ } else if (s->mode == USB_MSDM_DATAOUT) {
+ scsi_write_data(s->scsi_dev, s->tag);
+ }
+ }
ret = len;
break;
@@ -327,17 +405,24 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
if (len > s->data_len)
goto fail;
- s->transfer_len = len;
- if (scsi_write_data(s->scsi_dev, data, len))
- goto fail;
-
- if (s->transfer_len == 0) {
- ret = len;
- } else {
+ s->usb_buf = data;
+ s->usb_len = len;
+ if (s->scsi_len) {
+ usb_msd_copy_data(s);
+ }
+ if (s->residue && s->usb_len) {
+ s->data_len -= s->usb_len;
+ if (s->data_len == 0)
+ s->mode = USB_MSDM_CSW;
+ s->usb_len = 0;
+ }
+ if (s->usb_len) {
DPRINTF("Deferring packet %p\n", p);
usb_defer_packet(p, usb_msd_cancel_io, s);
s->packet = p;
ret = USB_RET_ASYNC;
+ } else {
+ ret = len;
}
break;
@@ -352,37 +437,51 @@ static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
goto fail;
switch (s->mode) {
+ case USB_MSDM_DATAOUT:
+ if (s->data_len != 0 || len < 13)
+ goto fail;
+ /* Waiting for SCSI write to complete. */
+ usb_defer_packet(p, usb_msd_cancel_io, s);
+ s->packet = p;
+ ret = USB_RET_ASYNC;
+ break;
+
case USB_MSDM_CSW:
DPRINTF("Command status %d tag 0x%x, len %d\n",
s->result, s->tag, len);
if (len < 13)
goto fail;
- csw.sig = cpu_to_le32(0x53425355);
- csw.tag = cpu_to_le32(s->tag);
- csw.residue = 0;
- csw.status = s->result;
- memcpy(data, &csw, 13);
- ret = 13;
+ s->usb_len = len;
+ s->usb_buf = data;
+ usb_msd_send_status(s);
s->mode = USB_MSDM_CBW;
+ ret = 13;
break;
case USB_MSDM_DATAIN:
DPRINTF("Data in %d/%d\n", len, s->data_len);
if (len > s->data_len)
len = s->data_len;
-
- s->transfer_len = len;
- if (scsi_read_data(s->scsi_dev, data, len))
- goto fail;
-
- if (s->transfer_len == 0) {
- ret = len;
- } else {
+ s->usb_buf = data;
+ s->usb_len = len;
+ if (s->scsi_len) {
+ usb_msd_copy_data(s);
+ }
+ if (s->residue && s->usb_len) {
+ s->data_len -= s->usb_len;
+ memset(s->usb_buf, 0, s->usb_len);
+ if (s->data_len == 0)
+ s->mode = USB_MSDM_CSW;
+ s->usb_len = 0;
+ }
+ if (s->usb_len) {
DPRINTF("Deferring packet %p\n", p);
usb_defer_packet(p, usb_msd_cancel_io, s);
s->packet = p;
ret = USB_RET_ASYNC;
+ } else {
+ ret = len;
}
break;
@@ -436,7 +535,7 @@ USBDevice *usb_msd_init(const char *filename)
snprintf(s->dev.devname, sizeof(s->dev.devname), "QEMU USB MSD(%.16s)",
filename);
- s->scsi_dev = scsi_disk_init(bdrv, usb_msd_command_complete, s);
+ s->scsi_dev = scsi_disk_init(bdrv, 0, usb_msd_command_complete, s);
usb_msd_handle_reset((USBDevice *)s);
return (USBDevice *)s;
fail:
generated by cgit v1.1 at 2024-11-03 05:12:40 +0000