scsi: ufs: Add max_lu_supported in struct ufs_dev_info

Add one new parameter max_lu_supported in struct ufs_dev_info, which will
be used to express exactly how many general LUs being supported by UFS
device, and initialize it during booting stage.  This patch also adds a new
function ufshcd_device_geo_params_init() for initialization of UFS device
geometry descriptor related parameters.

Link: https://lore.kernel.org/r/20200120130820.1737-8-huobean@gmail.comReviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufs.h

@@ -530,6 +530,8 @@ struct ufs_dev_info {
 	bool f_power_on_wp_en;
 	/* Keeps information if any of the LU is power on write protected */
 	bool is_lu_power_on_wp;
+	/* Maximum number of general LU supported by the UFS device */
+	u8 max_lu_supported;
 	u16 wmanufacturerid;
 	/*UFS device Product Name */
 	u8 *model;

drivers/scsi/ufs/ufshcd.c

@@ -6861,6 +6861,37 @@ static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
 		hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
 }
 
+static int ufshcd_device_geo_params_init(struct ufs_hba *hba)
+{
+	int err;
+	size_t buff_len;
+	u8 *desc_buf;
+
+	buff_len = hba->desc_size.geom_desc;
+	desc_buf = kmalloc(buff_len, GFP_KERNEL);
+	if (!desc_buf) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	err = ufshcd_read_desc(hba, QUERY_DESC_IDN_GEOMETRY, 0,
+			desc_buf, buff_len);
+	if (err) {
+		dev_err(hba->dev, "%s: Failed reading Geometry Desc. err = %d\n",
+				__func__, err);
+		goto out;
+	}
+
+	if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 1)
+		hba->dev_info.max_lu_supported = 32;
+	else if (desc_buf[GEOMETRY_DESC_PARAM_MAX_NUM_LUN] == 0)
+		hba->dev_info.max_lu_supported = 8;
+
+out:
+	kfree(desc_buf);
+	return err;
+}
+
 static struct ufs_ref_clk ufs_ref_clk_freqs[] = {
 	{19200000, REF_CLK_FREQ_19_2_MHZ},
 	{26000000, REF_CLK_FREQ_26_MHZ},
@@ -6934,9 +6965,17 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
 	bool flag;
 	int ret;
 
+	/* Clear any previous UFS device information */
+	memset(&hba->dev_info, 0, sizeof(hba->dev_info));
+
 	/* Init check for device descriptor sizes */
 	ufshcd_init_desc_sizes(hba);
 
+	/* Init UFS geometry descriptor related parameters */
+	ret = ufshcd_device_geo_params_init(hba);
+	if (ret)
+		goto out;
+
 	/* Check and apply UFS device quirks */
 	ret = ufs_get_device_desc(hba);
 	if (ret) {
@@ -6947,8 +6986,6 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
 
 	ufs_fixup_device_setup(hba);
 
-	/* Clear any previous UFS device information */
-	memset(&hba->dev_info, 0, sizeof(hba->dev_info));
 	if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG,
 			QUERY_FLAG_IDN_PWR_ON_WPE, &flag))
 		hba->dev_info.f_power_on_wp_en = flag;