From c1f1db37140c8102e4e4c4ba2fefc19b1bd82efe Mon Sep 17 00:00:00 2001 From: Can Guo Date: Tue, 29 Oct 2019 00:39:08 -0700 Subject: [PATCH] FROMLIST: scsi: ufs: Do not rely on prefetched data We were setting bActiveICCLevel attribute for UFS device only once but type of this attribute has changed from persistent to volatile since UFS device specification v2.1. This attribute is set to the default value after power cycle or hardware reset event. It isn't safe to rely on prefetched data (only used for bActiveICCLevel attribute now). Hence this change removes the code related to data prefetching and set this parameter on every attempt to probe the UFS device. Bug: 143632303 Change-Id: I3af6861e07dcfdf70112133de9e002e567982b6c Link: https://lore.kernel.org/patchwork/patch/1147024/ Signed-off-by: Can Guo Signed-off-by: Asutosh Das --- drivers/scsi/ufs/ufshcd.c | 30 +++++++++++++++--------------- drivers/scsi/ufs/ufshcd.h | 13 ------------- 2 files changed, 15 insertions(+), 28 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 28d2d41dead9..97a8c663fb80 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6555,11 +6555,12 @@ out: return icc_level; } -static void ufshcd_init_icc_levels(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; u8 *desc_buf; + u32 icc_level; desc_buf = kmalloc(buff_len, GFP_KERNEL); if (!desc_buf) @@ -6573,20 +6574,17 @@ static void ufshcd_init_icc_levels(struct ufs_hba *hba) goto out; } - hba->init_prefetch_data.icc_level = - ufshcd_find_max_sup_active_icc_level(hba, - desc_buf, buff_len); - dev_dbg(hba->dev, "%s: setting icc_level 0x%x", - __func__, hba->init_prefetch_data.icc_level); + icc_level = ufshcd_find_max_sup_active_icc_level(hba, desc_buf, + buff_len); + dev_dbg(hba->dev, "%s: setting icc_level 0x%x", __func__, icc_level); ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR, - QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0, - &hba->init_prefetch_data.icc_level); + QUERY_ATTR_IDN_ACTIVE_ICC_LVL, 0, 0, &icc_level); if (ret) dev_err(hba->dev, "%s: Failed configuring bActiveICCLevel = %d ret = %d", - __func__, hba->init_prefetch_data.icc_level , ret); + __func__, icc_level, ret); out: kfree(desc_buf); @@ -7081,6 +7079,14 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) } } + /* + * bActiveICCLevel is volatile for UFS device (as per latest v2.1 spec) + * and for removable UFS card as well, hence always set the parameter. + * Note: Error handler may issue the device reset hence resetting + * bActiveICCLevel as well so it is always safe to set this here. + */ + ufshcd_set_active_icc_lvl(hba); + /* set the state as operational after switching to desired gear */ hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; @@ -7100,9 +7106,6 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) QUERY_FLAG_IDN_PWR_ON_WPE, &flag)) hba->dev_info.f_power_on_wp_en = flag; - if (!hba->is_init_prefetch) - ufshcd_init_icc_levels(hba); - /* Add required well known logical units to scsi mid layer */ if (ufshcd_scsi_add_wlus(hba)) goto out; @@ -7127,9 +7130,6 @@ static int ufshcd_probe_hba(struct ufs_hba *hba) pm_runtime_put_sync(hba->dev); } - if (!hba->is_init_prefetch) - hba->is_init_prefetch = true; - out: /* * If we failed to initialize the device or the device is not diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 4a18628c439f..14f384e87600 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -433,15 +433,6 @@ struct ufs_clk_scaling { bool is_suspended; }; -/** - * struct ufs_init_prefetch - contains data that is pre-fetched once during - * initialization - * @icc_level: icc level which was read during initialization - */ -struct ufs_init_prefetch { - u32 icc_level; -}; - #define UFS_ERR_REG_HIST_LENGTH 8 /** * struct ufs_err_reg_hist - keeps history of errors @@ -533,8 +524,6 @@ struct ufs_stats { * @intr_mask: Interrupt Mask Bits * @ee_ctrl_mask: Exception event control mask * @is_powered: flag to check if HBA is powered - * @is_init_prefetch: flag to check if data was pre-fetched in initialization - * @init_prefetch_data: data pre-fetched during initialization * @eh_work: Worker to handle UFS errors that require s/w attention * @eeh_work: Worker to handle exception events * @errors: HBA errors @@ -699,8 +688,6 @@ struct ufs_hba { u32 intr_mask; u16 ee_ctrl_mask; bool is_powered; - bool is_init_prefetch; - struct ufs_init_prefetch init_prefetch_data; /* Work Queues */ struct work_struct eh_work;