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path: root/drivers/usb/gadget/f_mass_storage.c
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Diffstat (limited to 'drivers/usb/gadget/f_mass_storage.c')
-rw-r--r--drivers/usb/gadget/f_mass_storage.c202
1 files changed, 115 insertions, 87 deletions
diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 5b9339582007..c39d58860fa0 100644
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -112,8 +112,7 @@
* is not loaded (an empty string as "filename" in the fsg_config
* structure causes error). The CD-ROM emulation includes a single
* data track and no audio tracks; hence there need be only one
- * backing file per LUN. Note also that the CD-ROM block length is
- * set to 512 rather than the more common value 2048.
+ * backing file per LUN.
*
*
* MSF includes support for module parameters. If gadget using it
@@ -363,7 +362,7 @@ struct fsg_common {
struct fsg_buffhd *next_buffhd_to_fill;
struct fsg_buffhd *next_buffhd_to_drain;
- struct fsg_buffhd buffhds[FSG_NUM_BUFFERS];
+ struct fsg_buffhd *buffhds;
int cmnd_size;
u8 cmnd[MAX_COMMAND_SIZE];
@@ -625,7 +624,8 @@ static int fsg_setup(struct usb_function *f,
if (ctrl->bRequestType !=
(USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE))
break;
- if (w_index != fsg->interface_number || w_value != 0)
+ if (w_index != fsg->interface_number || w_value != 0 ||
+ w_length != 0)
return -EDOM;
/*
@@ -640,7 +640,8 @@ static int fsg_setup(struct usb_function *f,
if (ctrl->bRequestType !=
(USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE))
break;
- if (w_index != fsg->interface_number || w_value != 0)
+ if (w_index != fsg->interface_number || w_value != 0 ||
+ w_length != 1)
return -EDOM;
VDBG(fsg, "get max LUN\n");
*(u8 *)req->buf = fsg->common->nluns - 1;
@@ -745,7 +746,6 @@ static int do_read(struct fsg_common *common)
u32 amount_left;
loff_t file_offset, file_offset_tmp;
unsigned int amount;
- unsigned int partial_page;
ssize_t nread;
/*
@@ -771,7 +771,7 @@ static int do_read(struct fsg_common *common)
curlun->sense_data = SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
return -EINVAL;
}
- file_offset = ((loff_t) lba) << 9;
+ file_offset = ((loff_t) lba) << curlun->blkbits;
/* Carry out the file reads */
amount_left = common->data_size_from_cmnd;
@@ -784,18 +784,10 @@ static int do_read(struct fsg_common *common)
* Try to read the remaining amount.
* But don't read more than the buffer size.
* And don't try to read past the end of the file.
- * Finally, if we're not at a page boundary, don't read past
- * the next page.
- * If this means reading 0 then we were asked to read past
- * the end of file.
*/
amount = min(amount_left, FSG_BUFLEN);
amount = min((loff_t)amount,
curlun->file_length - file_offset);
- partial_page = file_offset & (PAGE_CACHE_SIZE - 1);
- if (partial_page > 0)
- amount = min(amount, (unsigned int)PAGE_CACHE_SIZE -
- partial_page);
/* Wait for the next buffer to become available */
bh = common->next_buffhd_to_fill;
@@ -812,7 +804,8 @@ static int do_read(struct fsg_common *common)
if (amount == 0) {
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info =
+ file_offset >> curlun->blkbits;
curlun->info_valid = 1;
bh->inreq->length = 0;
bh->state = BUF_STATE_FULL;
@@ -835,18 +828,25 @@ static int do_read(struct fsg_common *common)
} else if (nread < amount) {
LDBG(curlun, "partial file read: %d/%u\n",
(int)nread, amount);
- nread -= (nread & 511); /* Round down to a block */
+ nread = round_down(nread, curlun->blksize);
}
file_offset += nread;
amount_left -= nread;
common->residue -= nread;
+
+ /*
+ * Except at the end of the transfer, nread will be
+ * equal to the buffer size, which is divisible by the
+ * bulk-in maxpacket size.
+ */
bh->inreq->length = nread;
bh->state = BUF_STATE_FULL;
/* If an error occurred, report it and its position */
if (nread < amount) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info =
+ file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
@@ -877,7 +877,6 @@ static int do_write(struct fsg_common *common)
u32 amount_left_to_req, amount_left_to_write;
loff_t usb_offset, file_offset, file_offset_tmp;
unsigned int amount;
- unsigned int partial_page;
ssize_t nwritten;
int rc;
@@ -921,7 +920,7 @@ static int do_write(struct fsg_common *common)
/* Carry out the file writes */
get_some_more = 1;
- file_offset = usb_offset = ((loff_t) lba) << 9;
+ file_offset = usb_offset = ((loff_t) lba) << curlun->blkbits;
amount_left_to_req = common->data_size_from_cmnd;
amount_left_to_write = common->data_size_from_cmnd;
@@ -933,41 +932,21 @@ static int do_write(struct fsg_common *common)
/*
* Figure out how much we want to get:
- * Try to get the remaining amount.
- * But don't get more than the buffer size.
- * And don't try to go past the end of the file.
- * If we're not at a page boundary,
- * don't go past the next page.
- * If this means getting 0, then we were asked
- * to write past the end of file.
- * Finally, round down to a block boundary.
+ * Try to get the remaining amount,
+ * but not more than the buffer size.
*/
amount = min(amount_left_to_req, FSG_BUFLEN);
- amount = min((loff_t)amount,
- curlun->file_length - usb_offset);
- partial_page = usb_offset & (PAGE_CACHE_SIZE - 1);
- if (partial_page > 0)
- amount = min(amount,
- (unsigned int)PAGE_CACHE_SIZE - partial_page);
-
- if (amount == 0) {
+
+ /* Beyond the end of the backing file? */
+ if (usb_offset >= curlun->file_length) {
get_some_more = 0;
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = usb_offset >> 9;
+ curlun->sense_data_info =
+ usb_offset >> curlun->blkbits;
curlun->info_valid = 1;
continue;
}
- amount -= amount & 511;
- if (amount == 0) {
-
- /*
- * Why were we were asked to transfer a
- * partial block?
- */
- get_some_more = 0;
- continue;
- }
/* Get the next buffer */
usb_offset += amount;
@@ -977,12 +956,11 @@ static int do_write(struct fsg_common *common)
get_some_more = 0;
/*
- * amount is always divisible by 512, hence by
- * the bulk-out maxpacket size
+ * Except at the end of the transfer, amount will be
+ * equal to the buffer size, which is divisible by
+ * the bulk-out maxpacket size.
*/
- bh->outreq->length = amount;
- bh->bulk_out_intended_length = amount;
- bh->outreq->short_not_ok = 1;
+ set_bulk_out_req_length(common, bh, amount);
if (!start_out_transfer(common, bh))
/* Dunno what to do if common->fsg is NULL */
return -EIO;
@@ -1002,7 +980,8 @@ static int do_write(struct fsg_common *common)
/* Did something go wrong with the transfer? */
if (bh->outreq->status != 0) {
curlun->sense_data = SS_COMMUNICATION_FAILURE;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info =
+ file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
@@ -1016,6 +995,16 @@ static int do_write(struct fsg_common *common)
amount = curlun->file_length - file_offset;
}
+ /* Don't accept excess data. The spec doesn't say
+ * what to do in this case. We'll ignore the error.
+ */
+ amount = min(amount, bh->bulk_out_intended_length);
+
+ /* Don't write a partial block */
+ amount = round_down(amount, curlun->blksize);
+ if (amount == 0)
+ goto empty_write;
+
/* Perform the write */
file_offset_tmp = file_offset;
nwritten = vfs_write(curlun->filp,
@@ -1033,8 +1022,7 @@ static int do_write(struct fsg_common *common)
} else if (nwritten < amount) {
LDBG(curlun, "partial file write: %d/%u\n",
(int)nwritten, amount);
- nwritten -= (nwritten & 511);
- /* Round down to a block */
+ nwritten = round_down(nwritten, curlun->blksize);
}
file_offset += nwritten;
amount_left_to_write -= nwritten;
@@ -1043,13 +1031,15 @@ static int do_write(struct fsg_common *common)
/* If an error occurred, report it and its position */
if (nwritten < amount) {
curlun->sense_data = SS_WRITE_ERROR;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info =
+ file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
+ empty_write:
/* Did the host decide to stop early? */
- if (bh->outreq->actual != bh->outreq->length) {
+ if (bh->outreq->actual < bh->bulk_out_intended_length) {
common->short_packet_received = 1;
break;
}
@@ -1129,8 +1119,8 @@ static int do_verify(struct fsg_common *common)
return -EIO; /* No default reply */
/* Prepare to carry out the file verify */
- amount_left = verification_length << 9;
- file_offset = ((loff_t) lba) << 9;
+ amount_left = verification_length << curlun->blkbits;
+ file_offset = ((loff_t) lba) << curlun->blkbits;
/* Write out all the dirty buffers before invalidating them */
fsg_lun_fsync_sub(curlun);
@@ -1148,8 +1138,6 @@ static int do_verify(struct fsg_common *common)
* Try to read the remaining amount, but not more than
* the buffer size.
* And don't try to read past the end of the file.
- * If this means reading 0 then we were asked to read
- * past the end of file.
*/
amount = min(amount_left, FSG_BUFLEN);
amount = min((loff_t)amount,
@@ -1157,7 +1145,8 @@ static int do_verify(struct fsg_common *common)
if (amount == 0) {
curlun->sense_data =
SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info =
+ file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
@@ -1179,11 +1168,12 @@ static int do_verify(struct fsg_common *common)
} else if (nread < amount) {
LDBG(curlun, "partial file verify: %d/%u\n",
(int)nread, amount);
- nread -= nread & 511; /* Round down to a sector */
+ nread = round_down(nread, curlun->blksize);
}
if (nread == 0) {
curlun->sense_data = SS_UNRECOVERED_READ_ERROR;
- curlun->sense_data_info = file_offset >> 9;
+ curlun->sense_data_info =
+ file_offset >> curlun->blkbits;
curlun->info_valid = 1;
break;
}
@@ -1289,7 +1279,7 @@ static int do_read_capacity(struct fsg_common *common, struct fsg_buffhd *bh)
put_unaligned_be32(curlun->num_sectors - 1, &buf[0]);
/* Max logical block */
- put_unaligned_be32(512, &buf[4]); /* Block length */
+ put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */
return 8;
}
@@ -1527,7 +1517,7 @@ static int do_read_format_capacities(struct fsg_common *common,
put_unaligned_be32(curlun->num_sectors, &buf[0]);
/* Number of blocks */
- put_unaligned_be32(512, &buf[4]); /* Block length */
+ put_unaligned_be32(curlun->blksize, &buf[4]);/* Block length */
buf[4] = 0x02; /* Current capacity */
return 12;
}
@@ -1607,7 +1597,7 @@ static int throw_away_data(struct fsg_common *common)
common->next_buffhd_to_drain = bh->next;
/* A short packet or an error ends everything */
- if (bh->outreq->actual != bh->outreq->length ||
+ if (bh->outreq->actual < bh->bulk_out_intended_length ||
bh->outreq->status != 0) {
raise_exception(common,
FSG_STATE_ABORT_BULK_OUT);
@@ -1623,12 +1613,11 @@ static int throw_away_data(struct fsg_common *common)
amount = min(common->usb_amount_left, FSG_BUFLEN);
/*
- * amount is always divisible by 512, hence by
+ * Except at the end of the transfer, amount will be
+ * equal to the buffer size, which is divisible by
* the bulk-out maxpacket size.
*/
- bh->outreq->length = amount;
- bh->bulk_out_intended_length = amount;
- bh->outreq->short_not_ok = 1;
+ set_bulk_out_req_length(common, bh, amount);
if (!start_out_transfer(common, bh))
/* Dunno what to do if common->fsg is NULL */
return -EIO;
@@ -2022,7 +2011,8 @@ static int do_scsi_command(struct fsg_common *common)
case READ_6:
i = common->cmnd[4];
- common->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
+ common->data_size_from_cmnd = (i == 0 ? 256 : i) <<
+ common->curlun->blkbits;
reply = check_command(common, 6, DATA_DIR_TO_HOST,
(7<<1) | (1<<4), 1,
"READ(6)");
@@ -2032,7 +2022,8 @@ static int do_scsi_command(struct fsg_common *common)
case READ_10:
common->data_size_from_cmnd =
- get_unaligned_be16(&common->cmnd[7]) << 9;
+ get_unaligned_be16(&common->cmnd[7]) <<
+ common->curlun->blkbits;
reply = check_command(common, 10, DATA_DIR_TO_HOST,
(1<<1) | (0xf<<2) | (3<<7), 1,
"READ(10)");
@@ -2042,7 +2033,8 @@ static int do_scsi_command(struct fsg_common *common)
case READ_12:
common->data_size_from_cmnd =
- get_unaligned_be32(&common->cmnd[6]) << 9;
+ get_unaligned_be32(&common->cmnd[6]) <<
+ common->curlun->blkbits;
reply = check_command(common, 12, DATA_DIR_TO_HOST,
(1<<1) | (0xf<<2) | (0xf<<6), 1,
"READ(12)");
@@ -2142,7 +2134,8 @@ static int do_scsi_command(struct fsg_common *common)
case WRITE_6:
i = common->cmnd[4];
- common->data_size_from_cmnd = (i == 0 ? 256 : i) << 9;
+ common->data_size_from_cmnd = (i == 0 ? 256 : i) <<
+ common->curlun->blkbits;
reply = check_command(common, 6, DATA_DIR_FROM_HOST,
(7<<1) | (1<<4), 1,
"WRITE(6)");
@@ -2152,7 +2145,8 @@ static int do_scsi_command(struct fsg_common *common)
case WRITE_10:
common->data_size_from_cmnd =
- get_unaligned_be16(&common->cmnd[7]) << 9;
+ get_unaligned_be16(&common->cmnd[7]) <<
+ common->curlun->blkbits;
reply = check_command(common, 10, DATA_DIR_FROM_HOST,
(1<<1) | (0xf<<2) | (3<<7), 1,
"WRITE(10)");
@@ -2162,7 +2156,8 @@ static int do_scsi_command(struct fsg_common *common)
case WRITE_12:
common->data_size_from_cmnd =
- get_unaligned_be32(&common->cmnd[6]) << 9;
+ get_unaligned_be32(&common->cmnd[6]) <<
+ common->curlun->blkbits;
reply = check_command(common, 12, DATA_DIR_FROM_HOST,
(1<<1) | (0xf<<2) | (0xf<<6), 1,
"WRITE(12)");
@@ -2297,7 +2292,6 @@ static int get_next_command(struct fsg_common *common)
/* Queue a request to read a Bulk-only CBW */
set_bulk_out_req_length(common, bh, USB_BULK_CB_WRAP_LEN);
- bh->outreq->short_not_ok = 1;
if (!start_out_transfer(common, bh))
/* Don't know what to do if common->fsg is NULL */
return -EIO;
@@ -2348,7 +2342,7 @@ reset:
if (common->fsg) {
fsg = common->fsg;
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
struct fsg_buffhd *bh = &common->buffhds[i];
if (bh->inreq) {
@@ -2401,12 +2395,11 @@ reset:
goto reset;
fsg->bulk_out->driver_data = common;
fsg->bulk_out_enabled = 1;
- common->bulk_out_maxpacket =
- le16_to_cpu(fsg->bulk_out->desc->wMaxPacketSize);
+ common->bulk_out_maxpacket = usb_endpoint_maxp(fsg->bulk_out->desc);
clear_bit(IGNORE_BULK_OUT, &fsg->atomic_bitflags);
/* Allocate the requests */
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
struct fsg_buffhd *bh = &common->buffhds[i];
rc = alloc_request(common, fsg->bulk_in, &bh->inreq);
@@ -2475,7 +2468,7 @@ static void handle_exception(struct fsg_common *common)
/* Cancel all the pending transfers */
if (likely(common->fsg)) {
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
bh = &common->buffhds[i];
if (bh->inreq_busy)
usb_ep_dequeue(common->fsg->bulk_in, bh->inreq);
@@ -2487,7 +2480,7 @@ static void handle_exception(struct fsg_common *common)
/* Wait until everything is idle */
for (;;) {
int num_active = 0;
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
bh = &common->buffhds[i];
num_active += bh->inreq_busy + bh->outreq_busy;
}
@@ -2510,7 +2503,7 @@ static void handle_exception(struct fsg_common *common)
*/
spin_lock_irq(&common->lock);
- for (i = 0; i < FSG_NUM_BUFFERS; ++i) {
+ for (i = 0; i < fsg_num_buffers; ++i) {
bh = &common->buffhds[i];
bh->state = BUF_STATE_EMPTY;
}
@@ -2719,6 +2712,10 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
int nluns, i, rc;
char *pathbuf;
+ rc = fsg_num_buffers_validate();
+ if (rc != 0)
+ return ERR_PTR(rc);
+
/* Find out how many LUNs there should be */
nluns = cfg->nluns;
if (nluns < 1 || nluns > FSG_MAX_LUNS) {
@@ -2737,6 +2734,14 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
common->free_storage_on_release = 0;
}
+ common->buffhds = kcalloc(fsg_num_buffers,
+ sizeof *(common->buffhds), GFP_KERNEL);
+ if (!common->buffhds) {
+ if (common->free_storage_on_release)
+ kfree(common);
+ return ERR_PTR(-ENOMEM);
+ }
+
common->ops = cfg->ops;
common->private_data = cfg->private_data;
@@ -2814,7 +2819,7 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
/* Data buffers cyclic list */
bh = common->buffhds;
- i = FSG_NUM_BUFFERS;
+ i = fsg_num_buffers;
goto buffhds_first_it;
do {
bh->next = bh + 1;
@@ -2940,12 +2945,13 @@ static void fsg_common_release(struct kref *ref)
{
struct fsg_buffhd *bh = common->buffhds;
- unsigned i = FSG_NUM_BUFFERS;
+ unsigned i = fsg_num_buffers;
do {
kfree(bh->buf);
} while (++bh, --i);
}
+ kfree(common->buffhds);
if (common->free_storage_on_release)
kfree(common);
}
@@ -3019,6 +3025,28 @@ static int fsg_bind(struct usb_configuration *c, struct usb_function *f)
}
}
+ if (gadget_is_superspeed(gadget)) {
+ unsigned max_burst;
+
+ /* Calculate bMaxBurst, we know packet size is 1024 */
+ max_burst = min_t(unsigned, FSG_BUFLEN / 1024, 15);
+
+ fsg_ss_bulk_in_desc.bEndpointAddress =
+ fsg_fs_bulk_in_desc.bEndpointAddress;
+ fsg_ss_bulk_in_comp_desc.bMaxBurst = max_burst;
+
+ fsg_ss_bulk_out_desc.bEndpointAddress =
+ fsg_fs_bulk_out_desc.bEndpointAddress;
+ fsg_ss_bulk_out_comp_desc.bMaxBurst = max_burst;
+
+ f->ss_descriptors = usb_copy_descriptors(fsg_ss_function);
+ if (unlikely(!f->ss_descriptors)) {
+ usb_free_descriptors(f->hs_descriptors);
+ usb_free_descriptors(f->descriptors);
+ return -ENOMEM;
+ }
+ }
+
return 0;
autoconf_fail:
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-16 22:01:28 +0300