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| author | Ben Collins <bcollins@ubuntu.com> | 2006-06-12 18:14:14 -0400 |
|---|---|---|
| committer | Ben Collins <bcollins@ubuntu.com> | 2006-06-12 18:14:14 -0400 |
| commit | fd23ade80e2bef156aa096459c31c010dacbea1e (patch) | |
| tree | 7e381b0be5a7475d18c11b9795520e2eb0eba19a /drivers/ieee1394/sbp2.c | |
| parent | 40ae6c5e88790c2558013640ca4e0a5017c54162 (diff) | |
| download | blackbird-op-linux-fd23ade80e2bef156aa096459c31c010dacbea1e.tar.gz blackbird-op-linux-fd23ade80e2bef156aa096459c31c010dacbea1e.zip | |
sbp2: fix S800 transfers if phys_dma is off
If sbp2 is forced to move data via ARM handler, the maximum packet size
allowed for S800 transfers exceeds ohci1394's buffer size on platforms
where PAGE_SIZE is 4096.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Diffstat (limited to 'drivers/ieee1394/sbp2.c')
| -rw-r--r-- | drivers/ieee1394/sbp2.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c index c50aae948f0b..251656ec7d92 100644 --- a/drivers/ieee1394/sbp2.c +++ b/drivers/ieee1394/sbp2.c @@ -1649,6 +1649,8 @@ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id, } } +#define SBP2_PAYLOAD_TO_BYTES(p) (1 << ((p) + 2)) + /* * This function is called in order to determine the max speed and packet * size we can use in our ORBs. Note, that we (the driver and host) only @@ -1661,6 +1663,7 @@ static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id, static int sbp2_max_speed_and_size(struct scsi_id_instance_data *scsi_id) { struct sbp2scsi_host_info *hi = scsi_id->hi; + u8 payload; SBP2_DEBUG_ENTER(); @@ -1676,15 +1679,22 @@ static int sbp2_max_speed_and_size(struct scsi_id_instance_data *scsi_id) /* Payload size is the lesser of what our speed supports and what * our host supports. */ - scsi_id->max_payload_size = - min(sbp2_speedto_max_payload[scsi_id->speed_code], - (u8) (hi->host->csr.max_rec - 1)); + payload = min(sbp2_speedto_max_payload[scsi_id->speed_code], + (u8) (hi->host->csr.max_rec - 1)); + + /* If physical DMA is off, work around limitation in ohci1394: + * packet size must not exceed PAGE_SIZE */ + if (scsi_id->ne->host->low_addr_space < (1ULL << 32)) + while (SBP2_PAYLOAD_TO_BYTES(payload) + 24 > PAGE_SIZE && + payload) + payload--; HPSB_DEBUG("Node " NODE_BUS_FMT ": Max speed [%s] - Max payload [%u]", NODE_BUS_ARGS(hi->host, scsi_id->ne->nodeid), hpsb_speedto_str[scsi_id->speed_code], - 1 << ((u32) scsi_id->max_payload_size + 2)); + SBP2_PAYLOAD_TO_BYTES(payload)); + scsi_id->max_payload_size = payload; return 0; } |
