Re: [PATCH v3 7/8] scsi: ufs: Add max_lu_supported in struct ufs_dev_info

Alim Akhtar
2020-01-19T02:08:24Z

On Sun, Jan 19, 2020 at 5:45 AM Bean Huo <huobean@gmail.com> wrote:
>
> From: Bean Huo <beanhuo@micron.com>
>
> 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_init_device_geo_params()
> for initialization of UFS device geometry descriptor related parameters.
>
> Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
> Signed-off-by: Bean Huo <beanhuo@micron.com>
> ---
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>

> drivers/scsi/ufs/ufs.h | 2 ++
> drivers/scsi/ufs/ufshcd.c | 41 +++++++++++++++++++++++++++++++++++++--
> 2 files changed, 41 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index fcc9b4d4e56f..c982bcc94662 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/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;
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 4f8fcbb5f92e..dd10558f4d01 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6858,6 +6858,37 @@ static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
> hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
> }
>
> +static int ufshcd_init_device_geo_params(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},
> @@ -6931,9 +6962,17 @@ static int ufshcd_init_params(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_init_device_geo_params(hba);
> + if (ret)
> + goto out;
> +
> /* Check and apply UFS device quirks */
> ret = ufs_get_device_desc(hba);
> if (ret) {
> @@ -6944,8 +6983,6 @@ static int ufshcd_init_params(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;
> --
> 2.17.1
>

--
Regards,
Alim