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Subject[PATCH v4 09/32] scsi: hisi_sas: add slot init code
Date
Add functionality to init slot indexing.

Slot indexing is for the host to track which slots
(or tags) are free and which are used.

Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas.h | 4 ++++
drivers/scsi/hisi_sas/hisi_sas_main.c | 23 +++++++++++++++++++++++
2 files changed, 27 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index 6d1b7d8..2cd6771 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -66,6 +66,10 @@ struct hisi_hba {

int n_phy;

+
+ int slot_index_count;
+ unsigned long *slot_index_tags;
+
/* SCSI/SAS glue */
struct sas_ha_struct sha;
struct Scsi_Host *shost;
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index b96a2ab..d7e5b66 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -12,6 +12,21 @@
#include "hisi_sas.h"
#define DRV_NAME "hisi_sas"

+static void hisi_sas_slot_index_clear(struct hisi_hba *hisi_hba, int slot_idx)
+{
+ void *bitmap = hisi_hba->slot_index_tags;
+
+ clear_bit(slot_idx, bitmap);
+}
+
+static void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba)
+{
+ int i;
+
+ for (i = 0; i < hisi_hba->slot_index_count; ++i)
+ hisi_sas_slot_index_clear(hisi_hba, i);
+}
+
static struct scsi_transport_template *hisi_sas_stt;

static struct scsi_host_template hisi_sas_sht = {
@@ -102,6 +117,12 @@ static int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost)

memset(hisi_hba->breakpoint, 0, s);

+ hisi_hba->slot_index_count = HISI_SAS_COMMAND_ENTRIES;
+ s = hisi_hba->slot_index_count / sizeof(unsigned long);
+ hisi_hba->slot_index_tags = devm_kzalloc(dev, s, GFP_KERNEL);
+ if (!hisi_hba->slot_index_tags)
+ goto err_out;
+
hisi_hba->sge_page_pool = dma_pool_create("status_sge", dev,
sizeof(struct hisi_sas_sge_page), 16, 0);
if (!hisi_hba->sge_page_pool)
@@ -121,6 +142,8 @@ static int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost)
goto err_out;
memset(hisi_hba->sata_breakpoint, 0, s);

+ hisi_sas_slot_index_init(hisi_hba);
+
return 0;
err_out:
return -ENOMEM;
--
1.9.1


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