linux-kernel - [PATCH RFC v2 12/18] scsi: libsas drivers: Prepare for reserved commands

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Date:   Thu, 9 Jun 2022 18:29:13 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <damien.lemoal@...nsource.wdc.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <brking@...ibm.com>, <hare@...e.de>, <hch@....de>
CC:     <linux-block@...r.kernel.org>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <chenxiang66@...ilicon.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v2 12/18] scsi: libsas drivers: Prepare for reserved commands

Set the various LLDD fields to be able to use reserved commands. I have
only done this for hisi sas v2 HW, but all others need this treatment.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c  | 5 +++--
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 3 +++
 drivers/scsi/libsas/sas_init.c         | 5 +++++
 include/scsi/libsas.h                  | 8 ++++++++
 4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 0219ccac9062..2c5c6301f224 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -2427,8 +2427,9 @@ int hisi_sas_probe(struct platform_device *pdev,
 	shost->max_channel = 1;
 	shost->max_cmd_len = 16;
 	if (hisi_hba->hw->slot_index_alloc) {
-		shost->can_queue = HISI_SAS_MAX_COMMANDS;
-		shost->cmd_per_lun = HISI_SAS_MAX_COMMANDS;
+		shost->can_queue = HISI_SAS_UNRESERVED_IPTT;
+		shost->nr_reserved_cmds = HISI_SAS_RESERVED_IPTT;
+		shost->cmd_per_lun = HISI_SAS_UNRESERVED_IPTT;
 	} else {
 		shost->can_queue = HISI_SAS_UNRESERVED_IPTT;
 		shost->cmd_per_lun = HISI_SAS_UNRESERVED_IPTT;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 455d49299ddf..a1e60d2ef070 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -3564,6 +3564,7 @@ static struct scsi_host_template sht_v2_hw = {
 	.proc_name		= DRV_NAME,
 	.module			= THIS_MODULE,
 	.queuecommand		= sas_queuecommand,
+	.reserved_queuecommand = sas_queuecommand_internal,
 	.dma_need_drain		= ata_scsi_dma_need_drain,
 	.target_alloc		= sas_target_alloc,
 	.slave_configure	= hisi_sas_slave_configure,
@@ -3586,6 +3587,8 @@ static struct scsi_host_template sht_v2_hw = {
 	.host_reset		= hisi_sas_host_reset,
 	.map_queues		= map_queues_v2_hw,
 	.host_tagset		= 1,
+	.cmd_size = sizeof(struct sas_task),
+	.init_cmd_priv = sas_init_priv_cmd,
 };
 
 static const struct hisi_sas_hw hisi_sas_v2_hw = {
diff --git a/drivers/scsi/libsas/sas_init.c b/drivers/scsi/libsas/sas_init.c
index dc35f0f8eae3..b0921fbc35b1 100644
--- a/drivers/scsi/libsas/sas_init.c
+++ b/drivers/scsi/libsas/sas_init.c
@@ -93,6 +93,11 @@ void sas_hash_addr(u8 *hashed, const u8 *sas_addr)
 	hashed[2] = r & 0xFF;
 }
 
+int sas_init_priv_cmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
+{
+	return 0;
+}
+
 int sas_register_ha(struct sas_ha_struct *sas_ha)
 {
 	char name[64];
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 261169ffdca6..92fc3e5ef297 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -693,6 +693,8 @@ extern void sas_resume_ha(struct sas_ha_struct *sas_ha);
 extern void sas_resume_ha_no_sync(struct sas_ha_struct *sas_ha);
 extern void sas_suspend_ha(struct sas_ha_struct *sas_ha);
 
+extern int sas_init_priv_cmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd);
+
 int sas_set_phy_speed(struct sas_phy *phy, struct sas_phy_linkrates *rates);
 int sas_phy_reset(struct sas_phy *phy, int hard_reset);
 int sas_phy_enable(struct sas_phy *phy, int enable);
@@ -764,4 +766,10 @@ static inline struct sas_task *sas_rq_to_task(struct request *rq)
 	return (struct sas_task *)(scmd + 1);
 }
 
+static inline struct scsi_cmnd *sas_scmd_from_task(void *task)
+{
+	struct scsi_cmnd *scmd = task - sizeof(*scmd);
+
+	return scmd;
+}
 #endif /* _SASLIB_H_ */
-- 
2.26.2