RE: [v4 05/14] scsi: ufs: separate device and host quirks

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>> Currently we use the host quirks mechanism in order to
>> handle both device and host controller quirks.
>> In order to support various of UFS devices we should separate
>> handling the device quirks from the host controller's.
>>
>> Reviewed-by: Gilad Broner <gbroner@xxxxxxxxxxxxxx>
>> Signed-off-by: Raviv Shvili <rshvili@xxxxxxxxxxxxxx>
>> Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
>
>
>
> I would like to see this patch to be split into two
> 1. support for device descriptor read
> 2. support quirks
>
>
Hello Tom,

accepted your comment, and uploaded V5 in which patch v4 5/14 is divided
into 2 separate patches.
hope you can grant with your reviewed-by or acked-by

regards,
Yaniv


>>
>> ---
>>  drivers/scsi/ufs/Makefile     |   2 +-
>>  drivers/scsi/ufs/ufs.h        |  32 +++++++++++
>>  drivers/scsi/ufs/ufs_quirks.c | 100 ++++++++++++++++++++++++++++++++++
>>  drivers/scsi/ufs/ufs_quirks.h | 124
>> ++++++++++++++++++++++++++++++++++++++++++
>>  drivers/scsi/ufs/ufshcd.c     |  90 +++++++++++++++++++++++++++++-
>>  drivers/scsi/ufs/ufshcd.h     |  10 ++++
>>  6 files changed, 356 insertions(+), 2 deletions(-)
>>  create mode 100644 drivers/scsi/ufs/ufs_quirks.c
>>  create mode 100644 drivers/scsi/ufs/ufs_quirks.h
>>
>> diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
>> index 8303bcc..8570d41 100644
>> --- a/drivers/scsi/ufs/Makefile
>> +++ b/drivers/scsi/ufs/Makefile
>> @@ -1,5 +1,5 @@
>>  # UFSHCD makefile
>>  obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
>> -obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
>> +obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o ufs_quirks.o
>>  obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
>>  obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
>> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
>> index 42c459a..8dd608b 100644
>> --- a/drivers/scsi/ufs/ufs.h
>> +++ b/drivers/scsi/ufs/ufs.h
>> @@ -43,6 +43,7 @@
>>  #define GENERAL_UPIU_REQUEST_SIZE 32
>>  #define QUERY_DESC_MAX_SIZE       255
>>  #define QUERY_DESC_MIN_SIZE       2
>> +#define QUERY_DESC_HDR_SIZE       2
>>  #define QUERY_OSF_SIZE            (GENERAL_UPIU_REQUEST_SIZE - \
>>  					(sizeof(struct utp_upiu_header)))
>>
>> @@ -195,6 +196,37 @@ enum unit_desc_param {
>>  	UNIT_DESC_PARAM_LARGE_UNIT_SIZE_M1	= 0x22,
>>  };
>>
>> +/* 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,
>> +};
>> +
>
> This list is correct only for UFS 2.0, UFS 1.0 has different offsets.
>
>>  /*
>>   * Logical Unit Write Protect
>>   * 00h: LU not write protected
>> diff --git a/drivers/scsi/ufs/ufs_quirks.c
>> b/drivers/scsi/ufs/ufs_quirks.c
>> new file mode 100644
>> index 0000000..476ed01
>> --- /dev/null
>> +++ b/drivers/scsi/ufs/ufs_quirks.c
>> @@ -0,0 +1,100 @@
>> +/*
>> + * Copyright (c) 2013-2016, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#include "ufshcd.h"
>> +#include "ufs_quirks.h"
>> +
>> +static struct ufs_dev_fix ufs_fixups[] = {
>> +	/* UFS cards deviations table */
>> +	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
>> UFS_DEVICE_NO_VCCQ),
>> +	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
>> +		UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS),
>> +	UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
>> +		UFS_DEVICE_NO_FASTAUTO),
>> +	UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9C8KBADG",
>> +		UFS_DEVICE_QUIRK_PA_TACTIVATE),
>> +	UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9D8KBADG",
>> +		UFS_DEVICE_QUIRK_PA_TACTIVATE),
>> +
>> +	END_FIX
>> +};
>> +
>> +static int ufs_get_device_info(struct ufs_hba *hba,
>> +				struct ufs_device_info *card_data)
>> +{
>> +	int err;
>> +	u8 model_index;
>> +	u8 str_desc_buf[QUERY_DESC_STRING_MAX_SIZE + 1] = {0};
>> +	u8 desc_buf[QUERY_DESC_DEVICE_MAX_SIZE];
>> +
>> +	err = ufshcd_read_device_desc(hba, desc_buf,
>> +					QUERY_DESC_DEVICE_MAX_SIZE);
>> +	if (err) {
>> +		dev_err(hba->dev, "%s: Failed reading Device Desc. err = %d\n",
>> +			__func__, err);
>> +		goto out;
>> +	}
>> +
>> +	/*
>> +	 * getting vendor (manufacturerID) and Bank Index in big endian
>> +	 * format
>> +	 */
>> +	card_data->wmanufacturerid =
>> desc_buf[DEVICE_DESC_PARAM_MANF_ID] << 8 |
>> +				     desc_buf[DEVICE_DESC_PARAM_MANF_ID +
>> 1];
>> +
>> +	model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME];
>> +
>> +	err = ufshcd_read_string_desc(hba, model_index, str_desc_buf,
>> +					QUERY_DESC_STRING_MAX_SIZE,
>> ASCII_STD);
>> +	if (err) {
>> +		dev_err(hba->dev, "%s: Failed reading Product Name. err =
>> %d\n",
>> +			__func__, err);
>> +		goto out;
>> +	}
>> +
>> +	str_desc_buf[QUERY_DESC_STRING_MAX_SIZE] = '\0';
>> +	strlcpy(card_data->model, (str_desc_buf + QUERY_DESC_HDR_SIZE),
>> +		min_t(u8, str_desc_buf[QUERY_DESC_LENGTH_OFFSET],
>> +		      MAX_MODEL_LEN));
>> +
>> +	/* Null terminate the model string */
>> +	card_data->model[MAX_MODEL_LEN] = '\0';
>> +
>> +out:
>> +	return err;
>> +}
>
> This functionality should go to ufshcd.c , it would be maybe better just
> read device descriptor as during prob_hba
> And quirk will access the loaded descriptor.
>
>
>> +void ufs_advertise_fixup_device(struct ufs_hba *hba)
>> +{
>> +	int err;
>> +	struct ufs_dev_fix *f;
>> +	struct ufs_device_info card_data;
>> +
>> +	card_data.wmanufacturerid = 0;
>> +
>> +	err = ufs_get_device_info(hba, &card_data);
>> +	if (err) {
>> +		dev_err(hba->dev, "%s: Failed getting device info. err = %d\n",
>> +			__func__, err);
>> +		return;
>> +	}
>> +
>> +	for (f = ufs_fixups; f->quirk; f++) {
>> +		if (((f->card.wmanufacturerid == card_data.wmanufacturerid) ||
>> +		    (f->card.wmanufacturerid == UFS_ANY_VENDOR)) &&
>> +		    (STR_PRFX_EQUAL(f->card.model, card_data.model) ||
>> +		     !strcmp(f->card.model, UFS_ANY_MODEL)))
>> +			hba->dev_quirks |= f->quirk;
>> +	}
>> +}
>> +EXPORT_SYMBOL(ufs_advertise_fixup_device);
>> diff --git a/drivers/scsi/ufs/ufs_quirks.h
>> b/drivers/scsi/ufs/ufs_quirks.h
>> new file mode 100644
>> index 0000000..01ab166
>> --- /dev/null
>> +++ b/drivers/scsi/ufs/ufs_quirks.h
>> @@ -0,0 +1,124 @@
>> +/*
>> + * Copyright (c) 2014-2016, The Linux Foundation. All rights reserved.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 and
>> + * only version 2 as published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
>> + * GNU General Public License for more details.
>> + *
>> + */
>> +
>> +#ifndef _UFS_QUIRKS_H_
>> +#define _UFS_QUIRKS_H_
>> +
>> +/* return true if s1 is a prefix of s2 */
>> +#define STR_PRFX_EQUAL(s1, s2) !strncmp(s1, s2, strlen(s1))
>> +
>> +#define UFS_ANY_VENDOR -1
>> +#define UFS_ANY_MODEL  "ANY_MODEL"
>> +
>> +#define MAX_MODEL_LEN 16
>> +
>> +#define UFS_VENDOR_TOSHIBA     0x198
>> +#define UFS_VENDOR_SAMSUNG     0x1CE
>> +
>> +/**
>> + * ufs_device_info - ufs device details
>> + * @wmanufacturerid: card details
>> + * @model: card model
>> + */
>> +struct ufs_device_info {
>> +	u16 wmanufacturerid;
>> +	char model[MAX_MODEL_LEN + 1];
>> +};
>> +
>> +/**
>> + * ufs_dev_fix - ufs device quirk info
>> + * @card: ufs card details
>> + * @quirk: device quirk
>> + */
>> +struct ufs_dev_fix {
>> +	struct ufs_device_info card;
>> +	unsigned int quirk;
>> +};
>> +
>> +#define END_FIX { { 0 }, 0 }
>> +
>> +/* add specific device quirk */
>> +#define UFS_FIX(_vendor, _model, _quirk) \
>> +		{					  \
>> +			.card.wmanufacturerid = (_vendor),\
>> +			.card.model = (_model),		  \
>> +			.quirk = (_quirk),		  \
>> +		}
>> +
>> +/*
>> + * If UFS device is having issue in processing LCC (Line Control
>> + * Command) coming from UFS host controller then enable this quirk.
>> + * When this quirk is enabled, host controller driver should disable
>> + * the LCC transmission on UFS host controller (by clearing
>> + * TX_LCC_ENABLE attribute of host to 0).
>> + */
>> +#define UFS_DEVICE_QUIRK_BROKEN_LCC (1 << 0)
>> +
>> +/*
>> + * Some UFS devices don't need VCCQ rail for device operations.
>> Enabling this
>> + * quirk for such devices will make sure that VCCQ rail is not voted.
>> + */
>> +#define UFS_DEVICE_NO_VCCQ (1 << 1)
>> +
>> +/*
>> + * Some vendor's UFS device sends back to back NACs for the DL data
>> frames
>> + * causing the host controller to raise the DFES error status.
>> Sometimes
>> + * such UFS devices send back to back NAC without waiting for new
>> + * retransmitted DL frame from the host and in such cases it might be
>> possible
>> + * the Host UniPro goes into bad state without raising the DFES error
>> + * interrupt. If this happens then all the pending commands would
>> timeout
>> + * only after respective SW command (which is generally too large).
>> + *
>> + * We can workaround such device behaviour like this:
>> + * - As soon as SW sees the DL NAC error, it should schedule the error
>> handler
>> + * - Error handler would sleep for 50ms to see if there are any fatal
>> errors
>> + *   raised by UFS controller.
>> + *    - If there are fatal errors then SW does normal error recovery.
>> + *    - If there are no fatal errors then SW sends the NOP command to
>> device
>> + *      to check if link is alive.
>> + *        - If NOP command times out, SW does normal error recovery
>> + *        - If NOP command succeed, skip the error handling.
>> + *
>> + * If DL NAC error is seen multiple times with some vendor's UFS
>> devices then
>> + * enable this quirk to initiate quick error recovery and also silence
>> related
>> + * error logs to reduce spamming of kernel logs.
>> + */
>> +#define UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS (1 << 2)
>> +
>> +/*
>> + * Some UFS devices may not work properly after resume if the link was
>> kept
>> + * in off state during suspend. Enabling this quirk will not allow the
>> + * link to be kept in off state during suspend.
>> + */
>> +#define UFS_DEVICE_QUIRK_NO_LINK_OFF	(1 << 3)
>> +
>> +/*
>> + * Few Toshiba UFS device models advertise
>> RX_MIN_ACTIVATETIME_CAPABILITY as
>> + * 600us which may not be enough for reliable hibern8 exit hardware
>> sequence
>> + * from UFS device.
>> + * To workaround this issue, host should set its PA_TACTIVATE time to
>> 1ms even
>> + * if device advertises RX_MIN_ACTIVATETIME_CAPABILITY less than 1ms.
>> + */
>> +#define UFS_DEVICE_QUIRK_PA_TACTIVATE	(1 << 4)
>> +
>> +/*
>> + * Some UFS memory devices may have really low read/write throughput in
>> + * FAST AUTO mode, enable this quirk to make sure that FAST AUTO mode
>> is
>> + * never enabled for such devices.
>> + */
>> +#define UFS_DEVICE_NO_FASTAUTO		(1 << 5)
>> +
>> +struct ufs_hba;
>> +void ufs_advertise_fixup_device(struct ufs_hba *hba);
>> +#endif /* UFS_QUIRKS_H_ */
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index df0316b..95db156 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -39,9 +39,10 @@
>>
>>  #include <linux/async.h>
>>  #include <linux/devfreq.h>
>> -
>> +#include <linux/nls.h>
>>  #include <linux/of.h>
>>  #include "ufshcd.h"
>> +#include "ufs_quirks.h"
>>  #include "unipro.h"
>>
>>  #define UFSHCD_ENABLE_INTRS	(UTP_TRANSFER_REQ_COMPL |\
>> @@ -232,6 +233,16 @@ static inline void ufshcd_disable_irq(struct
>> ufs_hba
>> *hba)
>>  	}
>>  }
>>
>> +/* replace non-printable or non-ASCII characters with spaces */
>> +static inline void ufshcd_remove_non_printable(char *val)
>> +{
>> +	if (!val)
>> +		return;
>> +
>> +	if (*val < 0x20 || *val > 0x7e)
>> +		*val = ' ';
>> +}
>> +
>>  /*
>>   * ufshcd_wait_for_register - wait for register value to change
>>   * @hba - per-adapter interface
>> @@ -2021,6 +2032,82 @@ static inline int ufshcd_read_power_desc(struct
>> ufs_hba *hba,
>>  	return ufshcd_read_desc(hba, QUERY_DESC_IDN_POWER, 0, buf, size);
>>  }
>>
>> +int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size)
>> +{
>> +	return ufshcd_read_desc(hba, QUERY_DESC_IDN_DEVICE, 0, buf, size);
>> +}
>> +EXPORT_SYMBOL(ufshcd_read_device_desc);
>> +
>> +/**
>> + * ufshcd_read_string_desc - read string descriptor
>> + * @hba: pointer to adapter instance
>> + * @desc_index: descriptor index
>> + * @buf: pointer to buffer where descriptor would be read
>> + * @size: size of buf
>> + * @ascii: if true convert from unicode to ascii characters
>> + *
>> + * Return 0 in case of success, non-zero otherwise
>> + */
>> +int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index, u8
>> *buf,
>> +				u32 size, bool ascii)
>> +{
>> +	int err = 0;
>> +
>> +	err = ufshcd_read_desc(hba,
>> +				QUERY_DESC_IDN_STRING, desc_index, buf,
>> size);
>> +
>> +	if (err) {
>> +		dev_err(hba->dev, "%s: reading String Desc failed after %d
>> retries. err = %d\n",
>> +			__func__, QUERY_REQ_RETRIES, err);
>> +		goto out;
>> +	}
>> +
>> +	if (ascii) {
>> +		int desc_len;
>> +		int ascii_len;
>> +		int i;
>> +		char *buff_ascii;
>> +
>> +		desc_len = buf[0];
>> +		/* remove header and divide by 2 to move from UTF16 to UTF8
>> */
>> +		ascii_len = (desc_len - QUERY_DESC_HDR_SIZE) / 2 + 1;
>> +		if (size < ascii_len + QUERY_DESC_HDR_SIZE) {
>> +			dev_err(hba->dev, "%s: buffer allocated size is too
>> small\n",
>> +					__func__);
>> +			err = -ENOMEM;
>> +			goto out;
>> +		}
>> +
>> +		buff_ascii = kmalloc(ascii_len, GFP_KERNEL);
>> +		if (!buff_ascii) {
>> +			err = -ENOMEM;
>> +			goto out_free_buff;
>> +		}
>> +
>> +		/*
>> +		 * the descriptor contains string in UTF16 format
>> +		 * we need to convert to utf-8 so it can be displayed
>> +		 */
>> +		utf16s_to_utf8s((wchar_t *)&buf[QUERY_DESC_HDR_SIZE],
>> +				desc_len - QUERY_DESC_HDR_SIZE,
>> +				UTF16_BIG_ENDIAN, buff_ascii, ascii_len);
>
> Don't we need to load nls for that? (probably no, just asking).
>
>> +		/* replace non-printable or non-ASCII characters with spaces */
>> +		for (i = 0; i < ascii_len; i++)
>> +			ufshcd_remove_non_printable(&buff_ascii[i]);
>> +
>> +		memset(buf + QUERY_DESC_HDR_SIZE, 0,
>> +				size - QUERY_DESC_HDR_SIZE);
>> +		memcpy(buf + QUERY_DESC_HDR_SIZE, buff_ascii, ascii_len);
>> +		buf[QUERY_DESC_LENGTH_OFFSET] = ascii_len +
>> QUERY_DESC_HDR_SIZE;
>> +out_free_buff:
>> +		kfree(buff_ascii);
>> +	}
>> +out:
>> +	return err;
>> +}
>> +EXPORT_SYMBOL(ufshcd_read_string_desc);
>> +
>>  /**
>>   * ufshcd_read_unit_desc_param - read the specified unit descriptor
>> parameter
>>   * @hba: Pointer to adapter instance
>> @@ -4505,6 +4592,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
>>  	if (ret)
>>  		goto out;
>>
>> +	ufs_advertise_fixup_device(hba);
>>  	/* UFS device is also active now */
>>  	ufshcd_set_ufs_dev_active(hba);
>>  	ufshcd_force_reset_auto_bkops(hba);
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index 27ae395..b0c7e8b 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -470,6 +470,9 @@ struct ufs_hba {
>>
>>  	unsigned int quirks;	/* Deviations from standard UFSHCI spec. */
>>
>> +	/* Device deviations from standard UFS device spec. */
>> +	unsigned int dev_quirks;
>> +
>>  	wait_queue_head_t tm_wq;
>>  	wait_queue_head_t tm_tag_wq;
>>  	unsigned long tm_condition;
>> @@ -678,6 +681,13 @@ static inline int ufshcd_dme_peer_get(struct
>> ufs_hba
>> *hba,
>>  	return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
>>  }
>>
>> +int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size);
>> +
>> +#define ASCII_STD true
>> +
>> +int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index, u8
>> *buf,
>> +				u32 size, bool ascii);
>> +
>>  /* Expose Query-Request API */
>>  int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
>>  	enum flag_idn idn, bool *flag_res);
>> --
>> 1.8.5.2
>>
>> --
>> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a
>> member
>> of Code Aurora Forum, hosted by The Linux Foundation
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