HPB Introduction

一. HPB Overview

HPB全称为Host Performance Booster, 是利用手机内存缓存UFS Devices 主控(这里指的是Ufs Device Controller, 比如群联/慧荣等厂商的Ufs,控制运行FTL程序代码)的L2P表，来提升读性能，尤其是长时间使用后的随机读性能。

HPB技术是Jedec UFS3.1加入的Feature, 用来提升随机读性能，其实这个技术在无缓存的SSD上很常见。

二. 手机HPB方案介绍

目前Qcom/MTK/Sprd都开发了支持Ufs Host IP的手机芯片，现在用户越来越多的用户重视手机平时使用的流畅性，流畅性又和随机读有很大联系，所以支持HPB能提高竞争力。

以下以高通平台来举例：

Qcom Ufs Hos和Ufs Devices进行Probe匹配：

/*** ufshcd_probe_hba - probe hba to detect device and initialize* @hba: per-adapter instance** Execute link-startup and verify device initialization*/
static int ufshcd_probe_hba(struct ufs_hba *hba)
{ufsf_device_check(hba);
}

检查Ufs Devices Descriptor/Geometry Descriptor/Unit Descriptor 涉及HPB的属性

void ufsf_device_check(struct ufs_hba *hba)
{struct ufsf_feature *ufsf = &hba->ufsf;int ret, lun;u32 status;ufsf->slave_conf_cnt = 0;ufsf->hba = hba;ufshcd_query_attr(ufsf->hba, UPIU_QUERY_OPCODE_READ_ATTR,QUERY_ATTR_IDN_SUP_VENDOR_OPTIONS, 0, 0, &status);INIT_INFO("UFS FEATURE SELECTOR Dev %d - D/D %d", status,UFSFEATURE_SELECTOR);ret = ufsf_read_dev_desc(ufsf, UFSFEATURE_SELECTOR);if (ret)return;ret = ufsf_read_geo_desc(ufsf, UFSFEATURE_SELECTOR);if (ret)return;seq_scan_lu(lun) {ret = ufsf_read_unit_desc(ufsf, lun, UFSFEATURE_SELECTOR);if (ret == -ENOMEM)goto out_free_mem;}/* huangjianan@TECH.Storage.UFS, 2019/12/09, Add for UFS+ RUS */create_ufsplus_ctrl_proc(ufsf);return;
out_free_mem:
#if defined(CONFIG_UFSHPB)/* yujinghua@TECH.Storage.UFS, 2019/12/31, set the ufsf->ufshpb_lup[lun] as NULL after kfree*/seq_scan_lu(lun) {kfree(ufsf->ufshpb_lup[lun]);ufsf->ufshpb_lup[lun] = NULL;}/* don't call init handler */ufsf->ufshpb_state = HPB_FAILED;
#endif
#if defined(CONFIG_UFSTW)/* yujinghua@TECH.Storage.UFS, 2019/12/31, set the ufsf->tw_lup[lun] as NULL after kfree*/seq_scan_lu(lun) {kfree(ufsf->tw_lup[lun]);ufsf->tw_lup[lun] = NULL;}ufsf->tw_dev_info.tw_device = false;atomic_set(&ufsf->tw_state, TW_FAILED);
#endifreturn;
}

获取Device Descriptor配置，如果Devices Descriptor中0x1F bit[7]置1，说明支持HPB Feature.

void ufshpb_get_dev_info(struct ufshpb_dev_info *hpb_dev_info, u8 *desc_buf)
{int ret;hpb_dev_info->hpb_device = false;if (desc_buf[DEVICE_DESC_PARAM_UFS_FEAT] & UFS_FEATURE_SUPPORT_HPB_BIT)INIT_INFO("bUFSFeaturesSupport: HPB is set");else {INIT_INFO("bUFSFeaturesSupport: HPB not support");return;}hpb_dev_info->hpb_ver = LI_EN_16(desc_buf + DEVICE_DESC_PARAM_HPB_VER);ret = ufshpb_version_check(hpb_dev_info);if (!ret)hpb_dev_info->hpb_device = true;
}static inline int ufshpb_version_check(struct ufshpb_dev_info *hpb_dev_info)
{INIT_INFO("Support HPB Spec : Driver = %.4X  Device = %.4X",UFSHPB_VER, hpb_dev_info->hpb_ver);INIT_INFO("HPB Driver Version : %.4X", UFSHPB_DD_VER);if (hpb_dev_info->hpb_ver != UFSHPB_VER) {ERR_MSG("ERROR: HPB Spec Version mismatch. So HPB disabled.");return -ENODEV;}return 0;
}#define UFSHPB_VER             0x0200
#define UFS_FEATURE_SUPPORT_HPB_BIT     0x80/* Device descriptor parameters offsets in bytes*/
enum device_desc_param {DEVICE_DESC_PARAM_LEN           = 0x0,DEVICE_DESC_PARAM_TYPE           = 0x1,DEVICE_DESC_PARAM_DEVICE_TYPE        = 0x2,DEVICE_DESC_PARAM_DEVICE_CLASS       = 0x3,DEVICE_DESC_PARAM_DEVICE_SUB_CLASS   = 0x4,DEVICE_DESC_PARAM_PRTCL          = 0x5,DEVICE_DESC_PARAM_NUM_LU     = 0x6,DEVICE_DESC_PARAM_NUM_WLU        = 0x7,DEVICE_DESC_PARAM_BOOT_ENBL      = 0x8,DEVICE_DESC_PARAM_DESC_ACCSS_ENBL    = 0x9,DEVICE_DESC_PARAM_INIT_PWR_MODE      = 0xA,DEVICE_DESC_PARAM_HIGH_PR_LUN        = 0xB,DEVICE_DESC_PARAM_SEC_RMV_TYPE       = 0xC,DEVICE_DESC_PARAM_SEC_LU     = 0xD,DEVICE_DESC_PARAM_BKOP_TERM_LT       = 0xE,DEVICE_DESC_PARAM_ACTVE_ICC_LVL      = 0xF,DEVICE_DESC_PARAM_SPEC_VER       = 0x10,DEVICE_DESC_PARAM_MANF_DATE     = 0x12,DEVICE_DESC_PARAM_MANF_NAME     = 0x14,DEVICE_DESC_PARAM_PRDCT_NAME        = 0x15,DEVICE_DESC_PARAM_SN            = 0x16,DEVICE_DESC_PARAM_OEM_ID        = 0x17,DEVICE_DESC_PARAM_MANF_ID       = 0x18,DEVICE_DESC_PARAM_UD_OFFSET     = 0x1A,DEVICE_DESC_PARAM_UD_LEN        = 0x1B,DEVICE_DESC_PARAM_RTT_CAP       = 0x1C,DEVICE_DESC_PARAM_FRQ_RTC       = 0x1D,DEVICE_DESC_PARAM_UFS_FEAT      = 0x1F,DEVICE_DESC_PARAM_FFU_TMT       = 0x20,DEVICE_DESC_PARAM_Q_DPTH        = 0x21,DEVICE_DESC_PARAM_DEV_VER       = 0x22,DEVICE_DESC_PARAM_NUM_SEC_WPA       = 0x24,DEVICE_DESC_PARAM_PSA_MAX_DATA      = 0x25,DEVICE_DESC_PARAM_PSA_TMT       = 0x29,DEVICE_DESC_PARAM_PRDCT_REV     = 0x2A,
#ifdef VENDOR_EDIT
/* Hank.liu@TECH.PLAT.Storage, 2019-10-31, add UFS+ hpb and tw driver*/
#if defined(CONFIG_UFSHPB)DEVICE_DESC_PARAM_HPB_VER     = 0x40,
#endif
#endifDEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP = 0x4F,
#ifdef VENDOR_EDIT
#if defined(CONFIG_UFSTW)DEVICE_DESC_PARAM_TW_RETURN_TO_USER    = 0x53,DEVICE_DESC_PARAM_TW_BUF_TYPE       = 0x54,DEVICE_DESC_PARAM_TW_VER        = 0x55,
#endif
#endifDEVICE_DESC_PARAM_WB_US_RED_EN        = 0x53,DEVICE_DESC_PARAM_WB_TYPE       = 0x54,DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS = 0x55,
};

获取Geometry Descriptor关于HPB Feature的配置，获取的信息有:

(1)HPB Number Lun: 支持HPB Feature的Lun的数量

(2)HPB Region Size

(3)HPB SubRegion Size

(4)HPB Devices Max Active regions

static int ufsf_read_geo_desc(struct ufsf_feature *ufsf, u8 selector)
{u8 geo_buf[UFSF_QUERY_DESC_GEOMETRY_MAX_SIZE];int ret;ret = ufsf_read_desc(ufsf->hba, QUERY_DESC_IDN_GEOMETRY, 0, selector,geo_buf, UFSF_QUERY_DESC_GEOMETRY_MAX_SIZE);if (ret)return ret;#if defined(CONFIG_UFSHPB)if (ufsf->hpb_dev_info.hpb_device)ufshpb_get_geo_info(&ufsf->hpb_dev_info, geo_buf);
#endif#if defined(CONFIG_UFSTW)if (ufsf->tw_dev_info.tw_device)ufstw_get_geo_info(&ufsf->tw_dev_info, geo_buf);
#endifreturn 0;
}void ufshpb_get_geo_info(struct ufshpb_dev_info *hpb_dev_info, u8 *geo_buf)
{hpb_dev_info->hpb_number_lu = geo_buf[GEOMETRY_DESC_HPB_NUMBER_LU];if (hpb_dev_info->hpb_number_lu == 0) {ERR_MSG("Don't have a lu for hpb.");hpb_dev_info->hpb_device = false;return;}hpb_dev_info->hpb_rgn_size = geo_buf[GEOMETRY_DESC_HPB_REGION_SIZE];hpb_dev_info->hpb_srgn_size = geo_buf[GEOMETRY_DESC_HPB_SUBREGION_SIZE];hpb_dev_info->hpb_device_max_active_rgns =LI_EN_16(geo_buf + GEOMETRY_DESC_HPB_DEVICE_MAX_ACTIVE_REGIONS);INIT_INFO("[48] bHPBRegionSiz %u", hpb_dev_info->hpb_rgn_size);INIT_INFO("[49] bHPBNumberLU %u", hpb_dev_info->hpb_number_lu);INIT_INFO("[4A] bHPBSubRegionSize %u", hpb_dev_info->hpb_srgn_size);INIT_INFO("[4B:4C] wDeviceMaxActiveHPBRegions %u",hpb_dev_info->hpb_device_max_active_rgns);ufshpb_init_constant();
}static void ufshpb_init_constant(void)
{sects_per_blk_shift = ffs(BLOCK) - ffs(SECTOR);INIT_INFO("sects_per_blk_shift: %u %u", sects_per_blk_shift,ffs(SECTORS_PER_BLOCK) - 1);bits_per_dword_shift = ffs(BITS_PER_DWORD) - 1;bits_per_dword_mask = BITS_PER_DWORD - 1;INIT_INFO("bits_per_dword %u shift %u mask 0x%X", BITS_PER_DWORD,bits_per_dword_shift, bits_per_dword_mask);bits_per_byte_shift = ffs(BITS_PER_BYTE) - 1;INIT_INFO("bits_per_byte %u shift %u", BITS_PER_BYTE,bits_per_byte_shift);
}

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