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author | Martin K. Petersen <martin.petersen@oracle.com> | 2008-07-17 17:08:48 -0400 |
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committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-07-26 15:14:55 -0400 |
commit | 7027ad72a689797475973c6feb5f0b673382f779 (patch) | |
tree | 4f6daa1d509708fb340d09608d79557a9af57f00 /drivers/scsi/scsi.c | |
parent | db007fc5e20c00b356e9ffe2d0e007398c65c837 (diff) | |
download | kernel_samsung_espresso10-7027ad72a689797475973c6feb5f0b673382f779.zip kernel_samsung_espresso10-7027ad72a689797475973c6feb5f0b673382f779.tar.gz kernel_samsung_espresso10-7027ad72a689797475973c6feb5f0b673382f779.tar.bz2 |
[SCSI] Support devices with protection information
Implement support for DMA of protection information for devices that
are data integrity capable.
- Add support for mapping an extra scatter-gather list containing
the protection information.
- Allocate protection scsi_data_buffer if host is DIX (integrity DMA)
capable.
- Accessor function for checking whether a device has protection
enabled.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/scsi.c')
-rw-r--r-- | drivers/scsi/scsi.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 5276e73..ee6be59 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -197,11 +197,43 @@ static void scsi_pool_free_command(struct scsi_host_cmd_pool *pool, struct scsi_cmnd *cmd) { + if (cmd->prot_sdb) + kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb); + kmem_cache_free(pool->sense_slab, cmd->sense_buffer); kmem_cache_free(pool->cmd_slab, cmd); } /** + * scsi_host_alloc_command - internal function to allocate command + * @shost: SCSI host whose pool to allocate from + * @gfp_mask: mask for the allocation + * + * Returns a fully allocated command with sense buffer and protection + * data buffer (where applicable) or NULL on failure + */ +static struct scsi_cmnd * +scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask) +{ + struct scsi_cmnd *cmd; + + cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask); + if (!cmd) + return NULL; + + if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) { + cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask); + + if (!cmd->prot_sdb) { + scsi_pool_free_command(shost->cmd_pool, cmd); + return NULL; + } + } + + return cmd; +} + +/** * __scsi_get_command - Allocate a struct scsi_cmnd * @shost: host to transmit command * @gfp_mask: allocation mask @@ -214,7 +246,7 @@ struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask) struct scsi_cmnd *cmd; unsigned char *buf; - cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask); + cmd = scsi_host_alloc_command(shost, gfp_mask); if (unlikely(!cmd)) { unsigned long flags; @@ -457,7 +489,7 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost) /* * Get one backup command for this host. */ - cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask); + cmd = scsi_host_alloc_command(shost, gfp_mask); if (!cmd) { scsi_put_host_cmd_pool(gfp_mask); shost->cmd_pool = NULL; |