On Sun, Jul 26, 2020 at 9:15 PM Samuel Holland <[email protected]> wrote:
>
> The main issue observed was at the call to scsi_set_resid, where the
> byteswapped parameter would eventually trigger the alignment check at
> drivers/scsi/sd.c:2009. At that point, the kernel would continuously
> complain about an "Unaligned partial completion", and no further I/O
> could occur.
>
> This gets the controller working on big endian powerpc64.
>
> Signed-off-by: Samuel Holland <[email protected]>
> ---
> drivers/scsi/3w-9xxx.c | 35 +++++++++++++++++------------------
> drivers/scsi/3w-9xxx.h | 6 +++++-
> 2 files changed, 22 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
> index 3337b1e80412..95e25fda1f90 100644
> --- a/drivers/scsi/3w-9xxx.c
> +++ b/drivers/scsi/3w-9xxx.c
> @@ -303,10 +303,10 @@ static int twa_aen_drain_queue(TW_Device_Extension
> *tw_dev, int no_check_reset)
>
> /* Initialize sglist */
> memset(&sglist, 0, sizeof(TW_SG_Entry));
> - sglist[0].length = TW_SECTOR_SIZE;
> - sglist[0].address = tw_dev->generic_buffer_phys[request_id];
> + sglist[0].length = cpu_to_le32(TW_SECTOR_SIZE);
> + sglist[0].address =
> TW_CPU_TO_SGL(tw_dev->generic_buffer_phys[request_id]);
This looks like it would add a sparse warning, not fix one, unless you also
change the types of the target structure.
> @@ -501,7 +501,7 @@ static void twa_aen_sync_time(TW_Device_Extension
> *tw_dev, int request_id)
> Sunday 12:00AM */
> local_time = (ktime_get_real_seconds() - (sys_tz.tz_minuteswest *
> 60));
> div_u64_rem(local_time - (3 * 86400), 604800, &schedulertime);
> - schedulertime = cpu_to_le32(schedulertime % 604800);
> + cpu_to_le32p(&schedulertime);
>
> memcpy(param->data, &schedulertime, sizeof(u32));
You dropped the '%' operation, and the result of the byteswap?
> @@ -1004,7 +1004,7 @@ static int twa_fill_sense(TW_Device_Extension *tw_dev,
> int request_id, int copy_
> full_command_packet->header.status_block.error,
> error_str[0] == '\0' ?
> twa_string_lookup(twa_error_table,
> -
> full_command_packet->header.status_block.error) : error_str,
> +
> le16_to_cpu(full_command_packet->header.status_block.error)) : error_str,
> full_command_packet->header.err_specific_desc);
> else
This looks correct, but the error value has already been copied into the local
'error' variable, which you could use for simplification. As 'status_block' is
defined as a native_endian structure, this also introduced a sparse warning.
> @@ -1012,7 +1012,7 @@ static int twa_fill_sense(TW_Device_Extension *tw_dev,
> int request_id, int copy_
> full_command_packet->header.status_block.error,
> error_str[0] == '\0' ?
> twa_string_lookup(twa_error_table,
> -
> full_command_packet->header.status_block.error) : error_str,
> +
> le16_to_cpu(full_command_packet->header.status_block.error)) : error_str,
Same here
Arnd
