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usb_block_drv: use 10-byte SCSI commands by default

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Fixes #2826
This commit is contained in:
Christian Prochaska 2018-05-07 15:54:18 +02:00 committed by Christian Helmuth
parent 5ac56be748
commit 68ec33b0d3
1 changed files with 30 additions and 13 deletions
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43
repos/os/src/drivers/usb_block/main.cc
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@ -137,7 +137,7 @@ struct Usb::Block_driver : Usb::Completion,
bool _writeable = false;
bool force_cmd_10 = false;
bool force_cmd_16 = false;
uint8_t active_interface = 0;
uint8_t active_lun = 0;
@ -490,19 +490,37 @@ struct Usb::Block_driver : Usb::Completion,
}
}
/* Scsi::Opcode::READ_CAPACITY_16 */
Read_capacity_16 read_cap((addr_t)cbw_buffer, CAP_TAG, active_lun);
/*
* Some devices (e.g. corsair voyager usb stick (1b1c:1a03)) failed
* when the 16-byte command was tried first and when the 10-byte
* command was tried afterwards as a fallback.
*
* For this reason, we use the 10-byte commands by default and the
* 16-byte commands only when the capacity of the device requires
* it.
*/
/* Scsi::Opcode::READ_CAPACITY_10 */
Read_capacity_10 read_cap((addr_t)cbw_buffer, CAP_TAG, active_lun);
cbw(cbw_buffer, init, true);
resp(Scsi::Capacity_response_16::LENGTH, init, true);
resp(Scsi::Capacity_response_10::LENGTH, init, true);
csw(init, true);
if (!init.read_capacity) {
/* try Scsi::Opcode::READ_CAPACITY_10 next */
Read_capacity_10 read_cap((addr_t)cbw_buffer, CAP_TAG, active_lun);
Genode::warning("Read_capacity_cmd failed");
throw -1;
}
if (init.block_count == 0x100000000) {
/* capacity too large, try Scsi::Opcode::READ_CAPACITY_16 next */
Read_capacity_16 read_cap((addr_t)cbw_buffer, CAP_TAG, active_lun);
init.read_capacity = false;
cbw(cbw_buffer, init, true);
resp(Scsi::Capacity_response_10::LENGTH, init, true);
resp(Scsi::Capacity_response_16::LENGTH, init, true);
csw(init, true);
if (!init.read_capacity) {
@ -510,8 +528,7 @@ struct Usb::Block_driver : Usb::Completion,
throw -1;
}
Genode::warning("Device does not support CDB 16-byte commands, force 10-byte commands");
force_cmd_10 = true;
force_cmd_16 = true;
}
_block_size = init.block_size;
@ -747,11 +764,11 @@ struct Usb::Block_driver : Usb::Completion,
char cb[Cbw::LENGTH];
if (read) {
if (!force_cmd_10) Read_16 r((addr_t)cb, t, active_lun, lba, len, _block_size);
else Read_10 r((addr_t)cb, t, active_lun, lba, len, _block_size);
if (force_cmd_16) Read_16 r((addr_t)cb, t, active_lun, lba, len, _block_size);
else Read_10 r((addr_t)cb, t, active_lun, lba, len, _block_size);
} else {
if (!force_cmd_10) Write_16 w((addr_t)cb, t, active_lun, lba, len, _block_size);
else Write_10 w((addr_t)cb, t, active_lun, lba, len, _block_size);
if (force_cmd_16) Write_16 w((addr_t)cb, t, active_lun, lba, len, _block_size);
else Write_10 w((addr_t)cb, t, active_lun, lba, len, _block_size);
}
cbw(cb, *this);