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Subject[PATCH v4 04/32] scsi: hisi_sas: add scsi host registration
Date
Add functionality to register device as a scsi host.

The SAS domain transport ops are empty at this point.

Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/scsi/hisi_sas/hisi_sas.h | 34 ++++++++++
drivers/scsi/hisi_sas/hisi_sas_main.c | 116 ++++++++++++++++++++++++++++++++++
2 files changed, 150 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h
index a5cec22..6f57fd1 100644
--- a/drivers/scsi/hisi_sas/hisi_sas.h
+++ b/drivers/scsi/hisi_sas/hisi_sas.h
@@ -23,4 +23,38 @@

#define DRV_VERSION "v1.0"

+#define HISI_SAS_MAX_PHYS 9
+#define HISI_SAS_MAX_ITCT_ENTRIES 4096
+#define HISI_SAS_MAX_DEVICES HISI_SAS_MAX_ITCT_ENTRIES
+#define HISI_SAS_COMMAND_ENTRIES 8192
+
+struct hisi_sas_phy {
+ struct asd_sas_phy sas_phy;
+};
+
+struct hisi_sas_port {
+ struct asd_sas_port sas_port;
+};
+
+struct hisi_sas_hw {
+};
+
+struct hisi_hba {
+ /* This must be the first element, used by SHOST_TO_SAS_HA */
+ struct sas_ha_struct *p;
+
+ struct platform_device *pdev;
+ u8 sas_addr[SAS_ADDR_SIZE];
+
+ int n_phy;
+
+ /* SCSI/SAS glue */
+ struct sas_ha_struct sha;
+ struct Scsi_Host *shost;
+ struct hisi_sas_phy phy[HISI_SAS_MAX_PHYS];
+ struct hisi_sas_port port[HISI_SAS_MAX_PHYS];
+ const struct hisi_sas_hw *hw; /* Low level hw interface */
+};
+
+#define HISI_SAS_SGE_PAGE_CNT SCSI_MAX_SG_SEGMENTS
#endif
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 7201363..4fd000e 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -14,9 +14,125 @@

static struct scsi_transport_template *hisi_sas_stt;

+static struct scsi_host_template hisi_sas_sht = {
+ .module = THIS_MODULE,
+ .name = DRV_NAME,
+ .queuecommand = sas_queuecommand,
+ .target_alloc = sas_target_alloc,
+ .slave_configure = sas_slave_configure,
+ .change_queue_depth = sas_change_queue_depth,
+ .bios_param = sas_bios_param,
+ .can_queue = 1,
+ .this_id = -1,
+ .sg_tablesize = SG_ALL,
+ .max_sectors = SCSI_DEFAULT_MAX_SECTORS,
+ .use_clustering = ENABLE_CLUSTERING,
+ .eh_device_reset_handler = sas_eh_device_reset_handler,
+ .eh_bus_reset_handler = sas_eh_bus_reset_handler,
+ .target_destroy = sas_target_destroy,
+ .ioctl = sas_ioctl,
+};
+
static struct sas_domain_function_template hisi_sas_transport_ops = {
};

+static struct Scsi_Host *hisi_sas_shost_alloc(struct platform_device *pdev,
+ const struct hisi_sas_hw *hw)
+{
+ struct Scsi_Host *shost;
+ struct hisi_hba *hisi_hba;
+ struct device *dev = &pdev->dev;
+
+ shost = scsi_host_alloc(&hisi_sas_sht, sizeof(*hisi_hba));
+ if (!shost)
+ goto err_out;
+ hisi_hba = shost_priv(shost);
+
+ hisi_hba->hw = hw;
+ hisi_hba->pdev = pdev;
+ hisi_hba->shost = shost;
+ SHOST_TO_SAS_HA(shost) = &hisi_hba->sha;
+
+ return shost;
+err_out:
+ dev_err(dev, "shost alloc failed\n");
+ return NULL;
+}
+
+int hisi_sas_probe(struct platform_device *pdev,
+ const struct hisi_sas_hw *hw)
+{
+ struct Scsi_Host *shost;
+ struct hisi_hba *hisi_hba;
+ struct device *dev = &pdev->dev;
+ struct asd_sas_phy **arr_phy;
+ struct asd_sas_port **arr_port;
+ struct sas_ha_struct *sha;
+ int rc, phy_nr, port_nr, i;
+
+ shost = hisi_sas_shost_alloc(pdev, hw);
+ if (!shost) {
+ rc = -ENOMEM;
+ goto err_out_ha;
+ }
+
+ sha = SHOST_TO_SAS_HA(shost);
+ hisi_hba = shost_priv(shost);
+ platform_set_drvdata(pdev, sha);
+ hisi_hba->n_phy = HISI_SAS_MAX_PHYS;
+ phy_nr = port_nr = hisi_hba->n_phy;
+
+ arr_phy = devm_kcalloc(dev, phy_nr, sizeof(void *), GFP_KERNEL);
+ arr_port = devm_kcalloc(dev, port_nr, sizeof(void *), GFP_KERNEL);
+ if (!arr_phy || !arr_port)
+ return -ENOMEM;
+
+ sha->sas_phy = arr_phy;
+ sha->sas_port = arr_port;
+ sha->core.shost = shost;
+ sha->lldd_ha = hisi_hba;
+
+ shost->transportt = hisi_sas_stt;
+ shost->max_id = HISI_SAS_MAX_DEVICES;
+ shost->max_lun = ~0;
+ shost->max_channel = 1;
+ shost->max_cmd_len = 16;
+ shost->sg_tablesize = min_t(u16, SG_ALL, HISI_SAS_SGE_PAGE_CNT);
+ shost->can_queue = HISI_SAS_COMMAND_ENTRIES;
+ shost->cmd_per_lun = HISI_SAS_COMMAND_ENTRIES;
+
+ sha->sas_ha_name = DRV_NAME;
+ sha->dev = &hisi_hba->pdev->dev;
+ sha->lldd_module = THIS_MODULE;
+ sha->sas_addr = &hisi_hba->sas_addr[0];
+ sha->num_phys = hisi_hba->n_phy;
+ sha->core.shost = hisi_hba->shost;
+
+ for (i = 0; i < hisi_hba->n_phy; i++) {
+ sha->sas_phy[i] = &hisi_hba->phy[i].sas_phy;
+ sha->sas_port[i] = &hisi_hba->port[i].sas_port;
+ }
+
+ rc = scsi_add_host(shost, &pdev->dev);
+ if (rc)
+ goto err_out_ha;
+
+ rc = sas_register_ha(sha);
+ if (rc)
+ goto err_out_register_ha;
+
+ scsi_scan_host(shost);
+
+ return 0;
+
+err_out_register_ha:
+ scsi_remove_host(shost);
+err_out_ha:
+ kfree(shost);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(hisi_sas_probe);
+
static __init int hisi_sas_init(void)
{
pr_info("hisi_sas: driver version %s\n", DRV_VERSION);
--
1.9.1


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