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Date: Wed, 8 May 2013 20:58:43 +0530
From: Santosh Y <santoshsy@...il.com>
To: Dolev Raviv <draviv@...eaurora.org>
Cc: linux-scsi@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Sujit Reddy Thumma <sthumma@...eaurora.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] scsi: ufs: Add fDeviceInit set flag during initialization
> + */
> +int ufshcd_query_request(struct ufs_hba *hba,
> + struct ufs_query_req *query,
> + u8 *descriptor,
> + struct ufs_query_res *response,
> + int timeout,
> + int retries)
> +{
> + struct scsi_device *sdev;
> + u8 cmd[UFS_QUERY_CMD_SIZE] = {0};
> + int result;
> + bool sdev_lookup = true;
> +
> + if (!hba || !query || !response) {
> + dev_err(hba->dev,
Please fix the static checker warnings mentioned by Dan in the previous mail.
Re-base it on Seungwon's V4 patch series and you can add my Acked-by:
Santosh Y <santoshsy@...il.com>
> + "%s: NULL pointer hba = %p, query = %p response = %p\n",
> + __func__, hba, query, response);
> + return -EINVAL;
> + }
> +
> + /*
> + * A SCSI command structure is composed from opcode at the
> + * begining and 0 at the end.
> + */
> + cmd[0] = UFS_QUERY_RESERVED_SCSI_CMD;
> +
> + /* extracting the SCSI Device */
> + sdev = scsi_device_lookup(hba->host, 0, 0, 0);
> + if (!sdev) {
> + /**
> + * There are some Query Requests that are sent during device
> + * initialization, this happens before the scsi device was
> + * initialized. If there is no scsi device, we generate a
> + * temporary device to allow the Query Request flow.
> + */
> + sdev_lookup = false;
> + sdev = scsi_get_host_dev(hba->host);
> + }
> +
> + if (!sdev) {
> + dev_err(hba->dev, "%s: Could not fetch scsi device\n",
> + __func__);
> + return -ENODEV;
> + }
> +
> + mutex_lock(&hba->query.lock_ufs_query);
> + hba->query.request = query;
> + hba->query.descriptor = descriptor;
> + hba->query.response = response;
> +
> + /* wait until request is completed */
> + result = scsi_execute(sdev, cmd, DMA_NONE, NULL, 0, NULL,
> + timeout, retries, 0, NULL);
> + if (result) {
> + dev_err(hba->dev,
> + "%s: Query with opcode 0x%x, failed with result %d\n",
> + __func__, query->upiu_req.opcode, result);
> + result = -EIO;
> + }
> +
> + hba->query.request = NULL;
> + hba->query.descriptor = NULL;
> + hba->query.response = NULL;
> + mutex_unlock(&hba->query.lock_ufs_query);
> +
> + /* Releasing scsi device resource */
> + if (sdev_lookup)
> + scsi_device_put(sdev);
> + else
> + scsi_free_host_dev(sdev);
> +
> + return result;
> +}
> +
> +/**
> + * ufshcd_query_flag() - Helper function for composing flag query requests
> + * hba: per-adapter instance
> + * query_opcode: flag query to perform
> + * idn: flag idn to access
> + * flag_res: the flag value after the query request completes
> + *
> + * Returns 0 for success, non-zero in case of failure
> + */
> +int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
> + enum flag_idn idn, bool *flag_res)
> +{
> + struct ufs_query_req query = {0};
> + struct ufs_query_res response = {0};
> + int err;
> +
> + switch (opcode) {
> + case UPIU_QUERY_OPCODE_SET_FLAG:
> + case UPIU_QUERY_OPCODE_CLEAR_FLAG:
> + case UPIU_QUERY_OPCODE_TOGGLE_FLAG:
> + query.query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
> + break;
> + case UPIU_QUERY_OPCODE_READ_FLAG:
> + query.query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
> + break;
> + default:
> + dev_err(hba->dev,
> + "%s: Expected query flag opcode but got = %d\n",
> + __func__, opcode);
> + err = -EINVAL;
> + goto out;
> + }
> + query.upiu_req.opcode = opcode;
> + query.upiu_req.idn = idn;
> +
> + /* Send query request */
> + err = send_query_request(hba, &query, NULL, &response);
> +
> + if (err) {
> + dev_err(hba->dev,
> + "%s: Sending flag query for idn %d failed, err = %d\n",
> + __func__, idn, err);
> + goto out;
> + }
> +
> + *flag_res = (response.upiu_res.value & MASK_QUERY_UPIU_FLAG_LOC) & 0x1;
> +
> +out:
> + return err;
> +}
> +
> +/**
> * ufshcd_memory_alloc - allocate memory for host memory space data structures
> * @hba: per adapter instance
> *
> @@ -1324,6 +1488,44 @@ out:
> }
>
> /**
> + * ufshcd_validate_device_init() - checks device readines
> + * hba: per-adapter instance
> + *
> + * Set fDeviceInit flag, than, query the flag untill the device clears the
> + * flag.
> + */
> +static int ufshcd_validate_device_init(struct ufs_hba *hba)
> +{
> + int i, err;
> + bool flag_res = 0;
> +
> + err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
> + QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);
> + if (err) {
> + dev_err(hba->dev,
> + "%s setting fDeviceInit flag failed with error %d\n",
> + __func__, err);
> + goto out;
> + }
> +
> + for (i = 0; i < QUERY_REQ_RETRIES && !err && flag_res; i++) {
> + err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_READ_FLAG,
> + QUERY_FLAG_IDN_FDEVICEINIT, &flag_res);
> + }
> + if (err)
> + dev_err(hba->dev,
> + "%s reading fDeviceInit flag failed with error %d\n",
> + __func__, err);
> + else if (flag_res)
> + dev_err(hba->dev,
> + "%s fDeviceInit was not cleared by the device\n",
> + __func__);
> +
> +out:
> + return err;
> +}
> +
> +/**
> * ufshcd_make_hba_operational - Make UFS controller operational
> * @hba: per adapter instance
> *
> @@ -2153,6 +2355,10 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
> if (ret)
> goto out;
>
> + ret = ufshcd_validate_device_init(hba);
> + if (ret)
> + goto out;
> +
> scsi_scan_host(hba->host);
> out:
> return;
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index a91c558..76485da 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -286,4 +286,11 @@ static inline int ufshcd_dme_hibern8_exit(struct ufs_hba *hba)
> return ufshcd_dme_hibern8_ctrl(hba, 0);
> }
>
> +int ufs_query_request(struct ufs_hba *hba,
> + struct ufs_query_req *query,
> + u8 *descriptor,
> + struct ufs_query_res *response,
> + int timeout,
> + int retries);
> +
> #endif /* End of Header */
> --
> 1.7.6
> --
> 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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--
~Santosh
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