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Subject[PATCH v2 3/3] scsi: ufs: cleanup ufs initialization path
Date
From: Bean Huo <beanhuo@micron.com>

At UFS initialization stage, to get the length of the descriptor,
ufshcd_read_desc_length() being called 6 times. This patch is to
delete unnecessary reduntant code, remove ufshcd_read_desc_length()
and boost UFS initialization.

Signed-off-by: Bean Huo <beanhuo@micron.com>
---
drivers/scsi/ufs/ufshcd.c | 138 +++++++-------------------------------
drivers/scsi/ufs/ufshcd.h | 12 +---
2 files changed, 26 insertions(+), 124 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 0a95f0a5ab73..c47f4584c0f4 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -3052,47 +3052,6 @@ int ufshcd_query_descriptor_retry(struct ufs_hba *hba,
return err;
}

-/**
- * ufshcd_read_desc_length - read the specified descriptor length from header
- * @hba: Pointer to adapter instance
- * @desc_id: descriptor idn value
- * @desc_index: descriptor index
- * @desc_length: pointer to variable to read the length of descriptor
- *
- * Return 0 in case of success, non-zero otherwise
- */
-static int ufshcd_read_desc_length(struct ufs_hba *hba,
- enum desc_idn desc_id,
- int desc_index,
- int *desc_length)
-{
- int ret;
- u8 header[QUERY_DESC_HDR_SIZE];
- int header_len = QUERY_DESC_HDR_SIZE;
-
- if (desc_id >= QUERY_DESC_IDN_MAX)
- return -EINVAL;
-
- ret = ufshcd_query_descriptor_retry(hba, UPIU_QUERY_OPCODE_READ_DESC,
- desc_id, desc_index, 0, header,
- &header_len);
-
- if (ret) {
- dev_err(hba->dev, "%s: Failed to get descriptor header id %d",
- __func__, desc_id);
- return ret;
- } else if (desc_id != header[QUERY_DESC_DESC_TYPE_OFFSET]) {
- dev_warn(hba->dev, "%s: descriptor header id %d and desc_id %d mismatch",
- __func__, header[QUERY_DESC_DESC_TYPE_OFFSET],
- desc_id);
- ret = -EINVAL;
- }
-
- *desc_length = header[QUERY_DESC_LENGTH_OFFSET];
- return ret;
-
-}
-
/**
* ufshcd_map_desc_id_to_length - map descriptor IDN to its length
* @hba: Pointer to adapter instance
@@ -3101,46 +3060,27 @@ static int ufshcd_read_desc_length(struct ufs_hba *hba,
*
* Return 0 in case of success, non-zero otherwise
*/
-int ufshcd_map_desc_id_to_length(struct ufs_hba *hba,
- enum desc_idn desc_id, int *desc_len)
+int ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id,
+ int *desc_len)
{
- switch (desc_id) {
- case QUERY_DESC_IDN_DEVICE:
- *desc_len = hba->desc_size.dev_desc;
- break;
- case QUERY_DESC_IDN_POWER:
- *desc_len = hba->desc_size.pwr_desc;
- break;
- case QUERY_DESC_IDN_GEOMETRY:
- *desc_len = hba->desc_size.geom_desc;
- break;
- case QUERY_DESC_IDN_CONFIGURATION:
- *desc_len = hba->desc_size.conf_desc;
- break;
- case QUERY_DESC_IDN_UNIT:
- *desc_len = hba->desc_size.unit_desc;
- break;
- case QUERY_DESC_IDN_INTERCONNECT:
- *desc_len = hba->desc_size.interc_desc;
- break;
- case QUERY_DESC_IDN_STRING:
- *desc_len = QUERY_DESC_MAX_SIZE;
- break;
- case QUERY_DESC_IDN_HEALTH:
- *desc_len = hba->desc_size.hlth_desc;
- break;
- case QUERY_DESC_IDN_RFU_0:
- case QUERY_DESC_IDN_RFU_1:
- *desc_len = 0;
- break;
- default:
+ if (desc_id >= QUERY_DESC_IDN_MAX) {
*desc_len = 0;
return -EINVAL;
}
+
+ *desc_len = hba->desc_size[desc_id];
return 0;
}
EXPORT_SYMBOL(ufshcd_map_desc_id_to_length);

+static void ufshcd_update_desc_length(struct ufs_hba *hba,
+ enum desc_idn desc_id, int desc_len)
+{
+ if (hba->desc_size[desc_id] == QUERY_DESC_MAX_SIZE &&
+ desc_id != QUERY_DESC_IDN_STRING)
+ hba->desc_size[desc_id] = desc_len;
+}
+
/**
* ufshcd_read_desc_param - read the specified descriptor parameter
* @hba: Pointer to adapter instance
@@ -3209,6 +3149,9 @@ int ufshcd_read_desc_param(struct ufs_hba *hba,
goto out;
}

+ ufshcd_update_desc_length(hba, desc_id,
+ desc_buf[QUERY_DESC_LENGTH_OFFSET]);
+
/* Check wherher we will not copy more data, than available */
if (is_kmalloc && param_size > buff_len)
param_size = buff_len;
@@ -6665,7 +6608,7 @@ static u32 ufshcd_find_max_sup_active_icc_level(struct ufs_hba *hba,
static void ufshcd_set_active_icc_lvl(struct ufs_hba *hba)
{
int ret;
- int buff_len = hba->desc_size.pwr_desc;
+ int buff_len = hba->desc_size[QUERY_DESC_IDN_POWER];
u8 *desc_buf;
u32 icc_level;

@@ -6783,7 +6726,8 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
if (!ufshcd_is_wb_allowed(hba))
return;

- if (hba->desc_size.dev_desc < DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
+ if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
+ DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
goto wb_disabled;

hba->dev_info.d_ext_ufs_feature_sup =
@@ -6878,7 +6822,7 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
}

err = ufshcd_read_desc_param(hba, QUERY_DESC_IDN_DEVICE, 0, 0, desc_buf,
- hba->desc_size.dev_desc);
+ hba->desc_size[QUERY_DESC_IDN_DEVICE]);
if (err) {
dev_err(hba->dev, "%s: Failed reading Device Desc. err = %d\n",
__func__, err);
@@ -7108,42 +7052,10 @@ static void ufshcd_clear_dbg_ufs_stats(struct ufs_hba *hba)

static void ufshcd_init_desc_sizes(struct ufs_hba *hba)
{
- int err;
-
- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_DEVICE, 0,
- &hba->desc_size.dev_desc);
- if (err)
- hba->desc_size.dev_desc = QUERY_DESC_DEVICE_DEF_SIZE;
-
- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_POWER, 0,
- &hba->desc_size.pwr_desc);
- if (err)
- hba->desc_size.pwr_desc = QUERY_DESC_POWER_DEF_SIZE;
-
- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_INTERCONNECT, 0,
- &hba->desc_size.interc_desc);
- if (err)
- hba->desc_size.interc_desc = QUERY_DESC_INTERCONNECT_DEF_SIZE;
-
- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_CONFIGURATION, 0,
- &hba->desc_size.conf_desc);
- if (err)
- hba->desc_size.conf_desc = QUERY_DESC_CONFIGURATION_DEF_SIZE;
-
- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_UNIT, 0,
- &hba->desc_size.unit_desc);
- if (err)
- hba->desc_size.unit_desc = QUERY_DESC_UNIT_DEF_SIZE;
-
- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_GEOMETRY, 0,
- &hba->desc_size.geom_desc);
- if (err)
- hba->desc_size.geom_desc = QUERY_DESC_GEOMETRY_DEF_SIZE;
+ int i;

- err = ufshcd_read_desc_length(hba, QUERY_DESC_IDN_HEALTH, 0,
- &hba->desc_size.hlth_desc);
- if (err)
- hba->desc_size.hlth_desc = QUERY_DESC_HEALTH_DEF_SIZE;
+ for (i = 0; i < QUERY_DESC_IDN_MAX; i++)
+ hba->desc_size[i] = QUERY_DESC_MAX_SIZE;
}

static int ufshcd_device_geo_params_init(struct ufs_hba *hba)
@@ -7152,7 +7064,7 @@ static int ufshcd_device_geo_params_init(struct ufs_hba *hba)
size_t buff_len;
u8 *desc_buf;

- buff_len = hba->desc_size.geom_desc;
+ buff_len = hba->desc_size[QUERY_DESC_IDN_GEOMETRY];
desc_buf = kmalloc(buff_len, GFP_KERNEL);
if (!desc_buf) {
err = -ENOMEM;
@@ -7253,7 +7165,7 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
/* Clear any previous UFS device information */
memset(&hba->dev_info, 0, sizeof(hba->dev_info));

- /* Init check for device descriptor sizes */
+ /* Init device descriptor sizes */
ufshcd_init_desc_sizes(hba);

/* Init UFS geometry descriptor related parameters */
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index e3dfb48e669e..b966d9b0eb3d 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -236,16 +236,6 @@ struct ufs_dev_cmd {
struct ufs_query query;
};

-struct ufs_desc_size {
- int dev_desc;
- int pwr_desc;
- int geom_desc;
- int interc_desc;
- int unit_desc;
- int conf_desc;
- int hlth_desc;
-};
-
/**
* struct ufs_clk_info - UFS clock related info
* @list: list headed by hba->clk_list_head
@@ -738,7 +728,7 @@ struct ufs_hba {
bool is_urgent_bkops_lvl_checked;

struct rw_semaphore clk_scaling_lock;
- struct ufs_desc_size desc_size;
+ u8 desc_size[QUERY_DESC_IDN_MAX];
atomic_t scsi_block_reqs_cnt;

struct device bsg_dev;
--
2.17.1
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