[PATCH v3 32/48] scsi: megasas: Stop using the SCSI pointer

Bart Van Assche
2022-02-11T22:34:25Z

Set .cmd_size in the SCSI host template instead of using the SCSI pointer
from struct scsi_cmnd. This patch prepares for removal of the SCSI pointer
from struct scsi_cmnd.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/megaraid/megaraid_sas.h | 12 ++++++++++++
drivers/scsi/megaraid/megaraid_sas_base.c | 8 ++++----
drivers/scsi/megaraid/megaraid_sas_fusion.c | 15 ++++++++-------
3 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 2c9d1b796475..611871ef15b5 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -18,6 +18,8 @@
#ifndef LSI_MEGARAID_SAS_H
#define LSI_MEGARAID_SAS_H

+#include <scsi/scsi_cmnd.h>
+
/*
* MegaRAID SAS Driver meta data
*/
@@ -2594,6 +2596,16 @@ struct megasas_cmd {
};
};

+struct megasas_cmd_priv {
+ void *cmd_priv;
+ u8 status;
+};
+
+static inline struct megasas_cmd_priv *megasas_priv(struct scsi_cmnd *cmd)
+{
+ return scsi_cmd_priv(cmd);
+}
+
#define MAX_MGMT_ADAPTERS 1024
#define MAX_IOCTL_SGE 16

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 82e1e24257bc..8bf72dbc33b7 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1760,7 +1760,7 @@ megasas_build_and_issue_cmd(struct megasas_instance *instance,
goto out_return_cmd;

cmd->scmd = scmd;
- scmd->SCp.ptr = (char *)cmd;
+ megasas_priv(scmd)->cmd_priv = cmd;

/*
* Issue the command to the FW
@@ -2992,11 +2992,10 @@ megasas_dump_reg_set(void __iomem *reg_set)
void
megasas_dump_fusion_io(struct scsi_cmnd *scmd)
{
- struct megasas_cmd_fusion *cmd;
+ struct megasas_cmd_fusion *cmd = megasas_priv(scmd)->cmd_priv;
union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc;
struct megasas_instance *instance;

- cmd = (struct megasas_cmd_fusion *)scmd->SCp.ptr;
instance = (struct megasas_instance *)scmd->device->host->hostdata;

scmd_printk(KERN_INFO, scmd,
@@ -3518,6 +3517,7 @@ static struct scsi_host_template megasas_template = {
.mq_poll = megasas_blk_mq_poll,
.change_queue_depth = scsi_change_queue_depth,
.max_segment_size = 0xffffffff,
+ .cmd_size = sizeof(struct megasas_cmd_priv),
};

/**
@@ -3601,7 +3601,7 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
cmd->retry_for_fw_reset = 0;

if (cmd->scmd)
- cmd->scmd->SCp.ptr = NULL;
+ megasas_priv(cmd->scmd)->cmd_priv = NULL;

switch (hdr->cmd) {
case MFI_CMD_INVALID:
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index fc90a0a687b5..c72364864bf4 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -2915,7 +2915,7 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
get_updated_dev_handle(instance,
&fusion->load_balance_info[device_id],
&io_info, local_map_ptr);
- scp->SCp.Status |= MEGASAS_LOAD_BALANCE_FLAG;
+ megasas_priv(scp)->status |= MEGASAS_LOAD_BALANCE_FLAG;
cmd->pd_r1_lb = io_info.pd_after_lb;
if (instance->adapter_type >= VENTURA_SERIES)
rctx_g35->span_arm = io_info.span_arm;
@@ -2923,7 +2923,7 @@ megasas_build_ldio_fusion(struct megasas_instance *instance,
rctx->span_arm = io_info.span_arm;

} else
- scp->SCp.Status &= ~MEGASAS_LOAD_BALANCE_FLAG;
+ megasas_priv(scp)->status &= ~MEGASAS_LOAD_BALANCE_FLAG;

if (instance->adapter_type >= VENTURA_SERIES)
cmd->r1_alt_dev_handle = io_info.r1_alt_dev_handle;
@@ -3293,7 +3293,7 @@ megasas_build_io_fusion(struct megasas_instance *instance,
io_request->SenseBufferLength = SCSI_SENSE_BUFFERSIZE;

cmd->scmd = scp;
- scp->SCp.ptr = (char *)cmd;
+ megasas_priv(scp)->cmd_priv = cmd;

return 0;
}
@@ -3489,7 +3489,7 @@ megasas_complete_r1_command(struct megasas_instance *instance,
if (instance->ldio_threshold &&
megasas_cmd_type(scmd_local) == READ_WRITE_LDIO)
atomic_dec(&instance->ldio_outstanding);
- scmd_local->SCp.ptr = NULL;
+ megasas_priv(scmd_local)->cmd_priv = NULL;
megasas_return_cmd_fusion(instance, cmd);
scsi_dma_unmap(scmd_local);
megasas_sdev_busy_dec(instance, scmd_local);
@@ -3613,12 +3613,13 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex,
case MPI2_FUNCTION_SCSI_IO_REQUEST: /*Fast Path IO.*/
/* Update load balancing info */
if (fusion->load_balance_info &&
- (cmd_fusion->scmd->SCp.Status &
+ (megasas_priv(cmd_fusion->scmd)->status &
MEGASAS_LOAD_BALANCE_FLAG)) {
device_id = MEGASAS_DEV_INDEX(scmd_local);
lbinfo = &fusion->load_balance_info[device_id];
atomic_dec(&lbinfo->scsi_pending_cmds[cmd_fusion->pd_r1_lb]);
- cmd_fusion->scmd->SCp.Status &= ~MEGASAS_LOAD_BALANCE_FLAG;
+ megasas_priv(cmd_fusion->scmd)->status &=
+ ~MEGASAS_LOAD_BALANCE_FLAG;
}
fallthrough; /* and complete IO */
case MEGASAS_MPI2_FUNCTION_LD_IO_REQUEST: /* LD-IO Path */
@@ -3630,7 +3631,7 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex,
if (instance->ldio_threshold &&
(megasas_cmd_type(scmd_local) == READ_WRITE_LDIO))
atomic_dec(&instance->ldio_outstanding);
- scmd_local->SCp.ptr = NULL;
+ megasas_priv(scmd_local)->cmd_priv = NULL;
megasas_return_cmd_fusion(instance, cmd_fusion);
scsi_dma_unmap(scmd_local);
megasas_sdev_busy_dec(instance, scmd_local);