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Date: Fri, 21 Feb 2020 16:47:20 -0800
From: Asutosh Das <asutoshd@...eaurora.org>
To: subhashj@...eaurora.org, cang@...eaurora.org,
rnayak@...eaurora.org, vinholikatti@...il.com,
jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
linux-scsi@...r.kernel.org
Cc: Asutosh Das <asutoshd@...eaurora.org>,
linux-arm-msm@...r.kernel.org,
Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
Stanley Chu <stanley.chu@...iatek.com>,
Bean Huo <beanhuo@...ron.com>,
Tomas Winkler <tomas.winkler@...el.com>,
Colin Ian King <colin.king@...onical.com>,
Bart Van Assche <bvanassche@....org>,
Venkat Gopalakrishnan <venkatg@...eaurora.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
linux-kernel@...r.kernel.org (open list)
Subject: [<RFC PATCH v1> 1/2] scsi: ufs: add write booster feature support
Write Booster enable: SW will enable the feature
when clocks are scaled up.
Once clocks and gear are scaled up,
SW will set “fWriteBoosterEn” flag
before exiting from ufshcd_devfreq_scale() function.
Write Booster disable: SW will disable the feature,
when clocks are scaled down. Once clocks and gear
are scaled down, SW will clear “fWriteBoosterEn” flag
before exiting from ufshcd_devfreq_scale() function.
Write Booster Buffer flush will be enabled in following cases:
1. During runtime suspend, driver would query
bAvailableWriteBoosterBufferSize attribute and enable the
Write Booster Buffer Flush if less than 30% Write Booster
Buffer is available.
Write Booster Buffer flush will be disabled in following case:
During runtime suspend, if available buffer size is >30%,
then Write Booster Flush will be stopped by
clearing fWriteBoosterBufferFlushEn flag.
In non-reduction case, during runtime-suspend,
dCurrentWriteBoosterBufferSize attribute would determine
if flush is possible.
If this value is > 0 and availBuf is less
than 30% then flush is needed and vcc needs to be ON.
Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
---
drivers/scsi/ufs/ufs-sysfs.c | 41 ++++++-
drivers/scsi/ufs/ufs.h | 61 ++++++++-
drivers/scsi/ufs/ufshcd.c | 286 ++++++++++++++++++++++++++++++++++++++++++-
drivers/scsi/ufs/ufshcd.h | 9 ++
4 files changed, 390 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index dbdf8b0..4505e27 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -274,6 +274,10 @@ UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);
UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA, 1);
UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);
UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);
+UFS_DEVICE_DESC_PARAM(ext_feature_sup, _EXT_UFS_FEATURE_SUP, 4);
+UFS_DEVICE_DESC_PARAM(wb_presv_us_en, _WB_US_RED_EN, 1);
+UFS_DEVICE_DESC_PARAM(wb_type, _WB_TYPE, 1);
+UFS_DEVICE_DESC_PARAM(wb_shared_alloc_units, _WB_SHARED_ALLOC_UNITS, 4);
static struct attribute *ufs_sysfs_device_descriptor[] = {
&dev_attr_device_type.attr,
@@ -302,6 +306,10 @@ static struct attribute *ufs_sysfs_device_descriptor[] = {
&dev_attr_number_of_secure_wpa.attr,
&dev_attr_psa_max_data_size.attr,
&dev_attr_psa_state_timeout.attr,
+ &dev_attr_ext_feature_sup.attr,
+ &dev_attr_wb_presv_us_en.attr,
+ &dev_attr_wb_type.attr,
+ &dev_attr_wb_shared_alloc_units.attr,
NULL,
};
@@ -371,6 +379,12 @@ UFS_GEOMETRY_DESC_PARAM(enh4_memory_max_alloc_units,
_ENM4_MAX_NUM_UNITS, 4);
UFS_GEOMETRY_DESC_PARAM(enh4_memory_capacity_adjustment_factor,
_ENM4_CAP_ADJ_FCTR, 2);
+UFS_GEOMETRY_DESC_PARAM(wb_max_alloc_units, _WB_MAX_ALLOC_UNITS, 4);
+UFS_GEOMETRY_DESC_PARAM(wb_max_wb_luns, _WB_MAX_WB_LUNS, 1);
+UFS_GEOMETRY_DESC_PARAM(wb_buff_cap_adj, _WB_BUFF_CAP_ADJ, 1);
+UFS_GEOMETRY_DESC_PARAM(wb_sup_red_type, _WB_SUP_RED_TYPE, 1);
+UFS_GEOMETRY_DESC_PARAM(wb_sup_wb_type, _WB_SUP_WB_TYPE, 1);
+
static struct attribute *ufs_sysfs_geometry_descriptor[] = {
&dev_attr_raw_device_capacity.attr,
@@ -402,6 +416,11 @@ static struct attribute *ufs_sysfs_geometry_descriptor[] = {
&dev_attr_enh3_memory_capacity_adjustment_factor.attr,
&dev_attr_enh4_memory_max_alloc_units.attr,
&dev_attr_enh4_memory_capacity_adjustment_factor.attr,
+ &dev_attr_wb_max_alloc_units.attr,
+ &dev_attr_wb_max_wb_luns.attr,
+ &dev_attr_wb_buff_cap_adj.attr,
+ &dev_attr_wb_sup_red_type.attr,
+ &dev_attr_wb_sup_wb_type.attr,
NULL,
};
@@ -608,7 +627,7 @@ static ssize_t _name##_show(struct device *dev, \
if (ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG, \
QUERY_FLAG_IDN##_uname, &flag)) \
return -EINVAL; \
- return sprintf(buf, "%s\n", flag ? "true" : "false"); \
+ return snprintf(buf, PAGE_SIZE, "%s\n", flag ? "true" : "false"); \
} \
static DEVICE_ATTR_RO(_name)
@@ -620,6 +639,9 @@ UFS_FLAG(life_span_mode_enable, _LIFE_SPAN_MODE_ENABLE);
UFS_FLAG(phy_resource_removal, _FPHYRESOURCEREMOVAL);
UFS_FLAG(busy_rtc, _BUSY_RTC);
UFS_FLAG(disable_fw_update, _PERMANENTLY_DISABLE_FW_UPDATE);
+UFS_FLAG(wb_enable, _WB_EN);
+UFS_FLAG(wb_flush_en, _WB_BUFF_FLUSH_EN);
+UFS_FLAG(wb_flush_during_h8, _WB_BUFF_FLUSH_DURING_HIBERN8);
static struct attribute *ufs_sysfs_device_flags[] = {
&dev_attr_device_init.attr,
@@ -630,6 +652,9 @@ static struct attribute *ufs_sysfs_device_flags[] = {
&dev_attr_phy_resource_removal.attr,
&dev_attr_busy_rtc.attr,
&dev_attr_disable_fw_update.attr,
+ &dev_attr_wb_enable.attr,
+ &dev_attr_wb_flush_en.attr,
+ &dev_attr_wb_flush_during_h8.attr,
NULL,
};
@@ -647,7 +672,7 @@ static ssize_t _name##_show(struct device *dev, \
if (ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR, \
QUERY_ATTR_IDN##_uname, 0, 0, &value)) \
return -EINVAL; \
- return sprintf(buf, "0x%08X\n", value); \
+ return snprintf(buf, PAGE_SIZE, "0x%08X\n", value); \
} \
static DEVICE_ATTR_RO(_name)
@@ -667,6 +692,11 @@ UFS_ATTRIBUTE(exception_event_status, _EE_STATUS);
UFS_ATTRIBUTE(ffu_status, _FFU_STATUS);
UFS_ATTRIBUTE(psa_state, _PSA_STATE);
UFS_ATTRIBUTE(psa_data_size, _PSA_DATA_SIZE);
+UFS_ATTRIBUTE(wb_flush_status, _WB_FLUSH_STATUS);
+UFS_ATTRIBUTE(wb_avail_buf, _AVAIL_WB_BUFF_SIZE);
+UFS_ATTRIBUTE(wb_life_time_est, _WB_BUFF_LIFE_TIME_EST);
+UFS_ATTRIBUTE(wb_cur_buf, _CURR_WB_BUFF_SIZE);
+
static struct attribute *ufs_sysfs_attributes[] = {
&dev_attr_boot_lun_enabled.attr,
@@ -685,6 +715,10 @@ static struct attribute *ufs_sysfs_attributes[] = {
&dev_attr_ffu_status.attr,
&dev_attr_psa_state.attr,
&dev_attr_psa_data_size.attr,
+ &dev_attr_wb_flush_status.attr,
+ &dev_attr_wb_avail_buf.attr,
+ &dev_attr_wb_life_time_est.attr,
+ &dev_attr_wb_cur_buf.attr,
NULL,
};
@@ -736,6 +770,8 @@ UFS_UNIT_DESC_PARAM(provisioning_type, _PROVISIONING_TYPE, 1);
UFS_UNIT_DESC_PARAM(physical_memory_resourse_count, _PHY_MEM_RSRC_CNT, 8);
UFS_UNIT_DESC_PARAM(context_capabilities, _CTX_CAPABILITIES, 2);
UFS_UNIT_DESC_PARAM(large_unit_granularity, _LARGE_UNIT_SIZE_M1, 1);
+UFS_UNIT_DESC_PARAM(wb_buf_alloc_units, _WB_BUF_ALLOC_UNITS, 4);
+
static struct attribute *ufs_sysfs_unit_descriptor[] = {
&dev_attr_boot_lun_id.attr,
@@ -751,6 +787,7 @@ static struct attribute *ufs_sysfs_unit_descriptor[] = {
&dev_attr_physical_memory_resourse_count.attr,
&dev_attr_context_capabilities.attr,
&dev_attr_large_unit_granularity.attr,
+ &dev_attr_wb_buf_alloc_units.attr,
NULL,
};
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 990cb48..ffc4e18 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -63,6 +63,7 @@
#define UFS_UPIU_MAX_UNIT_NUM_ID 0x7F
#define UFS_MAX_LUNS (SCSI_W_LUN_BASE + UFS_UPIU_MAX_UNIT_NUM_ID)
#define UFS_UPIU_WLUN_ID (1 << 7)
+#define UFS_UPIU_MAX_GENERAL_LUN 8
/* Well known logical unit id in LUN field of UPIU */
enum {
@@ -140,6 +141,9 @@ enum flag_idn {
QUERY_FLAG_IDN_BUSY_RTC = 0x09,
QUERY_FLAG_IDN_RESERVED3 = 0x0A,
QUERY_FLAG_IDN_PERMANENTLY_DISABLE_FW_UPDATE = 0x0B,
+ QUERY_FLAG_IDN_WB_EN = 0x0E,
+ QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN = 0x0F,
+ QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8 = 0x10,
};
/* Attribute idn for Query requests */
@@ -168,6 +172,10 @@ enum attr_idn {
QUERY_ATTR_IDN_PSA_STATE = 0x15,
QUERY_ATTR_IDN_PSA_DATA_SIZE = 0x16,
QUERY_ATTR_IDN_REF_CLK_GATING_WAIT_TIME = 0x17,
+ QUERY_ATTR_IDN_WB_FLUSH_STATUS = 0x1C,
+ QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE = 0x1D,
+ QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST = 0x1E,
+ QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE = 0x1F,
};
/* Descriptor idn for Query requests */
@@ -191,7 +199,7 @@ enum desc_header_offset {
};
enum ufs_desc_def_size {
- QUERY_DESC_DEVICE_DEF_SIZE = 0x40,
+ QUERY_DESC_DEVICE_DEF_SIZE = 0x59,
QUERY_DESC_CONFIGURATION_DEF_SIZE = 0x90,
QUERY_DESC_UNIT_DEF_SIZE = 0x23,
QUERY_DESC_INTERCONNECT_DEF_SIZE = 0x06,
@@ -219,6 +227,7 @@ enum unit_desc_param {
UNIT_DESC_PARAM_PHY_MEM_RSRC_CNT = 0x18,
UNIT_DESC_PARAM_CTX_CAPABILITIES = 0x20,
UNIT_DESC_PARAM_LARGE_UNIT_SIZE_M1 = 0x22,
+ UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS = 0x29,
};
/* Device descriptor parameters offsets in bytes*/
@@ -258,6 +267,10 @@ enum device_desc_param {
DEVICE_DESC_PARAM_PSA_MAX_DATA = 0x25,
DEVICE_DESC_PARAM_PSA_TMT = 0x29,
DEVICE_DESC_PARAM_PRDCT_REV = 0x2A,
+ DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP = 0x4F,
+ DEVICE_DESC_PARAM_WB_US_RED_EN = 0x53,
+ DEVICE_DESC_PARAM_WB_TYPE = 0x54,
+ DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS = 0x55,
};
/* Interconnect descriptor parameters offsets in bytes*/
@@ -302,6 +315,11 @@ enum geometry_desc_param {
GEOMETRY_DESC_PARAM_ENM4_MAX_NUM_UNITS = 0x3E,
GEOMETRY_DESC_PARAM_ENM4_CAP_ADJ_FCTR = 0x42,
GEOMETRY_DESC_PARAM_OPT_LOG_BLK_SIZE = 0x44,
+ GEOMETRY_DESC_PARAM_WB_MAX_ALLOC_UNITS = 0x4F,
+ GEOMETRY_DESC_PARAM_WB_MAX_WB_LUNS = 0x53,
+ GEOMETRY_DESC_PARAM_WB_BUFF_CAP_ADJ = 0x54,
+ GEOMETRY_DESC_PARAM_WB_SUP_RED_TYPE = 0x55,
+ GEOMETRY_DESC_PARAM_WB_SUP_WB_TYPE = 0x56,
};
/* Health descriptor parameters offsets in bytes*/
@@ -333,6 +351,11 @@ enum {
UFSHCD_AMP = 3,
};
+/* Possible values for dExtendedUFSFeaturesSupport */
+enum {
+ UFS_DEV_WRITE_BOOSTER_SUP = BIT(8),
+};
+
#define POWER_DESC_MAX_SIZE 0x62
#define POWER_DESC_MAX_ACTV_ICC_LVLS 16
@@ -447,6 +470,38 @@ enum ufs_dev_pwr_mode {
UFS_POWERDOWN_PWR_MODE = 3,
};
+enum ufs_dev_wb_buf_avail_size {
+ UFS_WB_0_PERCENT_BUF_REMAIN = 0x0,
+ UFS_WB_10_PERCENT_BUF_REMAIN = 0x1,
+ UFS_WB_20_PERCENT_BUF_REMAIN = 0x2,
+ UFS_WB_30_PERCENT_BUF_REMAIN = 0x3,
+ UFS_WB_40_PERCENT_BUF_REMAIN = 0x4,
+ UFS_WB_50_PERCENT_BUF_REMAIN = 0x5,
+ UFS_WB_60_PERCENT_BUF_REMAIN = 0x6,
+ UFS_WB_70_PERCENT_BUF_REMAIN = 0x7,
+ UFS_WB_80_PERCENT_BUF_REMAIN = 0x8,
+ UFS_WB_90_PERCENT_BUF_REMAIN = 0x9,
+ UFS_WB_100_PERCENT_BUF_REMAIN = 0xA,
+};
+
+enum ufs_dev_wb_buf_life_time_est {
+ UFS_WB_0_10_PERCENT_USED = 0x1,
+ UFS_WB_10_20_PERCENT_USED = 0x2,
+ UFS_WB_20_30_PERCENT_USED = 0x3,
+ UFS_WB_30_40_PERCENT_USED = 0x4,
+ UFS_WB_40_50_PERCENT_USED = 0x5,
+ UFS_WB_50_60_PERCENT_USED = 0x6,
+ UFS_WB_60_70_PERCENT_USED = 0x7,
+ UFS_WB_70_80_PERCENT_USED = 0x8,
+ UFS_WB_80_90_PERCENT_USED = 0x9,
+ UFS_WB_90_100_PERCENT_USED = 0xA,
+ UFS_WB_MAX_USED = 0xB,
+};
+
+enum ufs_dev_wb_buf_user_cap_config {
+ UFS_WB_BUFF_PRESERVE_USER_SPACE = 1,
+ UFS_WB_BUFF_USER_SPACE_RED_EN = 2,
+};
/**
* struct utp_cmd_rsp - Response UPIU structure
* @residual_transfer_count: Residual transfer count DW-3
@@ -537,6 +592,10 @@ struct ufs_dev_info {
u8 *model;
u16 wspecversion;
u32 clk_gating_wait_us;
+ u32 d_ext_ufs_feature_sup;
+ u8 b_wb_buffer_type;
+ bool wb_config_lun;
+ bool keep_vcc_on;
};
/**
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index f4aa10f..4cc1fb4 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -47,6 +47,7 @@
#include "unipro.h"
#include "ufs-sysfs.h"
#include "ufs_bsg.h"
+#include <linux/blkdev.h>
#define CREATE_TRACE_POINTS
#include <trace/events/ufs.h>
@@ -263,6 +264,13 @@ static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up);
static irqreturn_t ufshcd_intr(int irq, void *__hba);
static int ufshcd_change_power_mode(struct ufs_hba *hba,
struct ufs_pa_layer_attr *pwr_mode);
+static bool ufshcd_wb_sup(struct ufs_hba *hba);
+static int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable);
+static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba);
+static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba);
+static bool ufshcd_wb_is_buf_flush_needed(struct ufs_hba *hba);
+static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
+
static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag)
{
return tag >= 0 && tag < hba->nutrs;
@@ -284,6 +292,38 @@ static inline void ufshcd_disable_irq(struct ufs_hba *hba)
}
}
+static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba)
+{
+ /*
+ * Query dAvailableWriteBoosterBufferSize attribute and enable
+ * the Write BoosterBuffer Flush if only 30% Write Booster
+ * Buffer is available.
+ * In reduction case, flush only if 10% is available
+ */
+ if (ufshcd_wb_is_buf_flush_needed(hba))
+ ufshcd_wb_buf_flush_enable(hba);
+ else
+ ufshcd_wb_buf_flush_disable(hba);
+}
+
+static inline void ufshcd_wb_config(struct ufs_hba *hba)
+{
+ int ret;
+
+ if (!ufshcd_wb_sup(hba))
+ return;
+
+ ret = ufshcd_wb_ctrl(hba, true);
+ if (ret)
+ dev_err(hba->dev, "%s: Enable WB failed: %d\n", __func__, ret);
+ else
+ dev_info(hba->dev, "%s: Write Booster Configured\n", __func__);
+ ret = ufshcd_wb_toggle_flush_during_h8(hba, true);
+ if (ret)
+ dev_err(hba->dev, "%s: En WB flush during H8: failed: %d\n",
+ __func__, ret);
+}
+
static void ufshcd_scsi_unblock_requests(struct ufs_hba *hba)
{
if (atomic_dec_and_test(&hba->scsi_block_reqs_cnt))
@@ -1139,6 +1179,8 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up)
}
ret = ufshcd_vops_clk_scale_notify(hba, scale_up, POST_CHANGE);
+ /* Enable Write Booster if we have scaled up else disable it */
+ ufshcd_wb_ctrl(hba, scale_up);
out:
ufshcd_clock_scaling_unprepare(hba);
@@ -4572,6 +4614,37 @@ static int ufshcd_get_lu_wp(struct ufs_hba *hba,
return ret;
}
+/*
+ * ufshcd_get_wb_alloc_units - returns "dLUNumWriteBoosterBufferAllocUnits"
+ * @hba: per-adapter instance
+ * @lun: UFS device lun id
+ * @d_lun_wbb_au: pointer to buffer to hold the LU's alloc units info
+ *
+ * Returns 0 in case of success and d_lun_wbb_au would be returned
+ * Returns -ENOTSUPP if reading d_lun_wbb_au is not supported.
+ * Returns -EINVAL in case of invalid parameters passed to this function.
+ */
+static int ufshcd_get_wb_alloc_units(struct ufs_hba *hba,
+ u8 lun,
+ u8 *d_lun_wbb_au)
+{
+ int ret;
+
+ if (!d_lun_wbb_au)
+ ret = -EINVAL;
+
+ /* WB can be supported only from LU0..LU7 */
+ else if (lun >= UFS_UPIU_MAX_GENERAL_LUN)
+ ret = -ENOTSUPP;
+ else
+ ret = ufshcd_read_unit_desc_param(hba,
+ lun,
+ UNIT_DESC_PARAM_WB_BUF_ALLOC_UNITS,
+ d_lun_wbb_au,
+ sizeof(*d_lun_wbb_au));
+ return ret;
+}
+
/**
* ufshcd_get_lu_power_on_wp_status - get LU's power on write protect
* status
@@ -5194,6 +5267,165 @@ static void ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
__func__, err);
}
+static bool ufshcd_wb_sup(struct ufs_hba *hba)
+{
+ return ((hba->dev_info.d_ext_ufs_feature_sup &
+ UFS_DEV_WRITE_BOOSTER_SUP) &&
+ (hba->dev_info.b_wb_buffer_type
+ || hba->dev_info.wb_config_lun));
+}
+
+static int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable)
+{
+ int ret;
+ enum query_opcode opcode;
+
+ if (!ufshcd_wb_sup(hba))
+ return 0;
+
+ if (enable)
+ opcode = UPIU_QUERY_OPCODE_SET_FLAG;
+ else
+ opcode = UPIU_QUERY_OPCODE_CLEAR_FLAG;
+
+ ret = ufshcd_query_flag_retry(hba, opcode,
+ QUERY_FLAG_IDN_WB_EN, NULL);
+ if (ret) {
+ dev_err(hba->dev, "%s write booster %s failed %d\n",
+ __func__, enable ? "enable" : "disable", ret);
+ return ret;
+ }
+
+ hba->wb_enabled = enable;
+ dev_dbg(hba->dev, "%s write booster %s %d\n",
+ __func__, enable ? "enable" : "disable", ret);
+
+ return ret;
+}
+
+static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set)
+{
+ int val;
+
+ if (set)
+ val = UPIU_QUERY_OPCODE_SET_FLAG;
+ else
+ val = UPIU_QUERY_OPCODE_CLEAR_FLAG;
+
+ return ufshcd_query_flag_retry(hba, val,
+ QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8,
+ NULL);
+}
+
+static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba)
+{
+ int ret;
+
+ if (!ufshcd_wb_sup(hba) || hba->wb_buf_flush_enabled)
+ return 0;
+
+ ret = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+ QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN, NULL);
+ if (ret)
+ dev_err(hba->dev, "%s WB - buf flush enable failed %d\n",
+ __func__, ret);
+ else
+ hba->wb_buf_flush_enabled = true;
+
+ dev_dbg(hba->dev, "WB - Flush enabled: %d\n", ret);
+ return ret;
+}
+
+static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba)
+{
+ int ret;
+
+ if (!ufshcd_wb_sup(hba) || !hba->wb_buf_flush_enabled)
+ return 0;
+
+ ret = ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
+ QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN, NULL);
+ if (ret) {
+ dev_warn(hba->dev, "%s: WB - buf flush disable failed %d\n",
+ __func__, ret);
+ } else {
+ hba->wb_buf_flush_enabled = false;
+ dev_dbg(hba->dev, "WB - Flush disabled: %d\n", ret);
+ }
+
+ return ret;
+}
+
+static bool ufshcd_wb_is_buf_flush_needed(struct ufs_hba *hba)
+{
+ int ret;
+ u32 cur_buf, status, avail_buf;
+
+ if (!ufshcd_wb_sup(hba))
+ return false;
+
+ ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+ QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE,
+ 0, 0, &avail_buf);
+ if (ret) {
+ dev_warn(hba->dev, "%s dAvailableWriteBoosterBufferSize read failed %d\n",
+ __func__, ret);
+ return false;
+ }
+
+ ret = ufshcd_vops_get_user_cap_mode(hba);
+ if (ret <= 0) {
+ dev_dbg(hba->dev, "Get user-cap reduction mode: failed: %d\n",
+ ret);
+ /* Most commonly used */
+ ret = UFS_WB_BUFF_PRESERVE_USER_SPACE;
+ }
+
+ hba->dev_info.keep_vcc_on = false;
+ if (ret == UFS_WB_BUFF_USER_SPACE_RED_EN) {
+ if (avail_buf <= UFS_WB_10_PERCENT_BUF_REMAIN) {
+ hba->dev_info.keep_vcc_on = true;
+ return true;
+ }
+ return false;
+ } else if (ret == UFS_WB_BUFF_PRESERVE_USER_SPACE) {
+ ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+ QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE,
+ 0, 0, &cur_buf);
+ if (ret) {
+ dev_err(hba->dev, "%s dCurWriteBoosterBufferSize read failed %d\n",
+ __func__, ret);
+ return false;
+ }
+
+ if (!cur_buf) {
+ dev_info(hba->dev, "dCurWBBuf: %d WB disabled until free-space is available\n",
+ cur_buf);
+ return false;
+ }
+
+ ret = ufshcd_get_ee_status(hba, &status);
+ if (ret) {
+ dev_err(hba->dev, "%s: failed to get exception status %d\n",
+ __func__, ret);
+ if (avail_buf < UFS_WB_40_PERCENT_BUF_REMAIN) {
+ hba->dev_info.keep_vcc_on = true;
+ return true;
+ }
+ return false;
+ }
+
+ status &= hba->ee_ctrl_mask;
+
+ if ((status & MASK_EE_URGENT_BKOPS) ||
+ (avail_buf < UFS_WB_40_PERCENT_BUF_REMAIN)) {
+ hba->dev_info.keep_vcc_on = true;
+ return true;
+ }
+ }
+ return false;
+}
+
/**
* ufshcd_exception_event_handler - handle exceptions raised by device
* @work: pointer to work data
@@ -6629,7 +6861,8 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
int err;
size_t buff_len;
u8 model_index;
- u8 *desc_buf;
+ u8 *desc_buf, wb_buf[4];
+ u32 lun, res;
struct ufs_dev_info *dev_info = &hba->dev_info;
buff_len = max_t(size_t, hba->desc_size.dev_desc,
@@ -6660,6 +6893,40 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1];
model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];
+ /* Enable WB only for UFS-3.1 OR if desc len >= 0x59 */
+ if (dev_info->wspecversion >= 0x310) {
+ hba->dev_info.d_ext_ufs_feature_sup =
+ desc_buf[DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP]
+ << 24 |
+ desc_buf[DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 1]
+ << 16 |
+ desc_buf[DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 2]
+ << 8 |
+ desc_buf[DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 3];
+
+ hba->dev_info.b_wb_buffer_type =
+ desc_buf[DEVICE_DESC_PARAM_WB_TYPE];
+
+ if (hba->dev_info.b_wb_buffer_type)
+ goto skip_unit_desc;
+
+ hba->dev_info.wb_config_lun = false;
+ for (lun = 0; lun < UFS_UPIU_MAX_GENERAL_LUN; lun++) {
+ memset(wb_buf, 0, sizeof(wb_buf));
+ err = ufshcd_get_wb_alloc_units(hba, lun, wb_buf);
+ if (err)
+ break;
+
+ res = wb_buf[0] << 24 | wb_buf[1] << 16 |
+ wb_buf[2] << 8 | wb_buf[3];
+ if (res) {
+ hba->dev_info.wb_config_lun = true;
+ break;
+ }
+ }
+ }
+
+skip_unit_desc:
err = ufshcd_read_string_desc(hba, model_index,
&dev_info->model, SD_ASCII_STD);
if (err < 0) {
@@ -7162,6 +7429,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
/* set the state as operational after switching to desired gear */
hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL;
+ ufshcd_wb_config(hba);
/* Enable Auto-Hibernate if configured */
ufshcd_auto_hibern8_enable(hba);
@@ -7823,12 +8091,16 @@ static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
*
* Ignore the error returned by ufshcd_toggle_vreg() as device is anyway
* in low power state which would save some power.
+ *
+ * If Write Booster is enabled and the device needs to flush the WB
+ * buffer OR if bkops status is urgent for WB, keep Vcc on.
*/
if (ufshcd_is_ufs_dev_poweroff(hba) && ufshcd_is_link_off(hba) &&
!hba->dev_info.is_lu_power_on_wp) {
ufshcd_setup_vreg(hba, false);
} else if (!ufshcd_is_ufs_dev_active(hba)) {
- ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
+ if (!hba->dev_info.keep_vcc_on)
+ ufshcd_toggle_vreg(hba->dev, hba->vreg_info.vcc, false);
if (!ufshcd_is_link_active(hba)) {
ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq);
ufshcd_config_vreg_lpm(hba, hba->vreg_info.vccq2);
@@ -7952,11 +8224,16 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
/* make sure that auto bkops is disabled */
ufshcd_disable_auto_bkops(hba);
}
+ ufshcd_wb_toggle_flush(hba);
+ } else if (!ufshcd_is_runtime_pm(pm_op)) {
+ ufshcd_wb_buf_flush_disable(hba);
+ hba->dev_info.keep_vcc_on = false;
}
if ((req_dev_pwr_mode != hba->curr_dev_pwr_mode) &&
- ((ufshcd_is_runtime_pm(pm_op) && !hba->auto_bkops_enabled) ||
- !ufshcd_is_runtime_pm(pm_op))) {
+ ((ufshcd_is_runtime_pm(pm_op) && (!hba->auto_bkops_enabled)
+ && !hba->wb_buf_flush_enabled) ||
+ !ufshcd_is_runtime_pm(pm_op))) {
/* ensure that bkops is disabled */
ufshcd_disable_auto_bkops(hba);
ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode);
@@ -8078,6 +8355,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
goto vendor_suspend;
}
+ ufshcd_wb_buf_flush_disable(hba);
if (!ufshcd_is_ufs_dev_active(hba)) {
ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
if (ret)
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 8f516b2..6f36ff3 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -327,6 +327,7 @@ struct ufs_hba_variant_ops {
void (*dbg_register_dump)(struct ufs_hba *hba);
int (*phy_initialization)(struct ufs_hba *);
void (*device_reset)(struct ufs_hba *hba);
+ u32 (*get_user_cap_mode)(struct ufs_hba *hba);
};
/* clock gating state */
@@ -731,6 +732,8 @@ struct ufs_hba {
struct device bsg_dev;
struct request_queue *bsg_queue;
+ bool wb_buf_flush_enabled;
+ bool wb_enabled;
};
/* Returns true if clocks can be gated. Otherwise false */
@@ -1123,4 +1126,10 @@ static inline u8 ufshcd_scsi_to_upiu_lun(unsigned int scsi_lun)
int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
const char *prefix);
+static inline unsigned int ufshcd_vops_get_user_cap_mode(struct ufs_hba *hba)
+{
+ if (hba->vops && hba->vops->get_user_cap_mode)
+ return hba->vops->get_user_cap_mode(hba);
+ return 0;
+}
#endif /* End of Header */
--
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