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Commit 04218a4f authored by Subhash Jadavani's avatar Subhash Jadavani Committed by David Keitel
Browse files

scsi: ufs: debugfs: add option to read peer DME attribute 



This patch adds the debugfs capability to read the DME attribute of
peer UniPro/M-PHY. This should help for debugging.

Change-Id: I26d3675bdda8b9fdf0f9aa6b81a1ffafbd828fd0
[subhashj@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
[venkatg@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: default avatarVenkat Gopalakrishnan <venkatg@codeaurora.org>
parent 3997870e

drivers/scsi/ufs/debugfs.c

+95 −13
Original line number Diff line number Diff line
@@ -753,6 +753,23 @@ out: 
	return ret;

}



static int ufsdbg_config_pwr_mode(struct ufs_hba *hba,

		struct ufs_pa_layer_attr *desired_pwr_mode)

{

	#define DOORBELL_CLR_TOUT_US	(1000 * 1000) /* 1 sec */

	int ret;



	pm_runtime_get_sync(hba->dev);

	scsi_block_requests(hba->host);

	ret = ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US);

	if (!ret)

		ret = ufshcd_change_power_mode(hba, desired_pwr_mode);

	scsi_unblock_requests(hba->host);

	pm_runtime_put_sync(hba->dev);



	return ret;

}



static ssize_t ufsdbg_power_mode_write(struct file *file,

				const char __user *ubuf, size_t cnt,

				loff_t *ppos)
@@ -764,7 +781,6 @@ static ssize_t ufsdbg_power_mode_write(struct file *file, 
	loff_t buff_pos = 0;

	int ret;

	int idx = 0;

	#define DOORBELL_CLR_TOUT_US	(1000 * 1000) /* 1 sec */



	ret = simple_write_to_buffer(pwr_mode_str, BUFF_LINE_CAPACITY,

		&buff_pos, ubuf, cnt);
@@ -800,13 +816,7 @@ static ssize_t ufsdbg_power_mode_write(struct file *file, 
		return cnt;

	}



	pm_runtime_get_sync(hba->dev);

	scsi_block_requests(hba->host);

	ret = ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US);

	if (!ret)

		ret = ufshcd_change_power_mode(hba, &final_pwr_mode);

	scsi_unblock_requests(hba->host);

	pm_runtime_put_sync(hba->dev);

	ret = ufsdbg_config_pwr_mode(hba, &final_pwr_mode);

	if (ret == -EBUSY)

		dev_err(hba->dev,

			"%s: ufshcd_config_pwr_mode failed: system is busy, try again\n",
@@ -830,19 +840,21 @@ static const struct file_operations ufsdbg_power_mode_desc = { 
	.write		= ufsdbg_power_mode_write,

};



static int ufsdbg_dme_local_read(void *data, u64 *attr_val)

static int ufsdbg_dme_read(void *data, u64 *attr_val, bool peer)

{

	int ret;

	struct ufs_hba *hba = data;

	u32 read_val = 0;

	u32 attr_id, read_val = 0;

	int (*read_func) (struct ufs_hba *, u32, u32 *);



	if (!hba)

		return -EINVAL;



	read_func = peer ? ufshcd_dme_peer_get : ufshcd_dme_get;

	attr_id = peer ? hba->debugfs_files.dme_peer_attr_id :

			 hba->debugfs_files.dme_local_attr_id;

	pm_runtime_get_sync(hba->dev);

	ret = ufshcd_dme_get(hba,

			UIC_ARG_MIB(hba->debugfs_files.dme_local_attr_id),

			&read_val);

	ret = ufshcd_dme_get(hba, UIC_ARG_MIB(attr_id), &read_val);

	pm_runtime_put_sync(hba->dev);



	if (!ret)
@@ -863,11 +875,70 @@ static int ufsdbg_dme_local_set_attr_id(void *data, u64 attr_id) 
	return 0;

}



static int ufsdbg_dme_local_read(void *data, u64 *attr_val)

{

	return ufsdbg_dme_read(data, attr_val, false);

}



DEFINE_SIMPLE_ATTRIBUTE(ufsdbg_dme_local_read_ops,

			ufsdbg_dme_local_read,

			ufsdbg_dme_local_set_attr_id,

			"%llu\n");



static int ufsdbg_dme_peer_read(void *data, u64 *attr_val)

{

	int ret;

	struct ufs_hba *hba = data;

	struct ufs_pa_layer_attr orig_pwr_info;

	struct ufs_pa_layer_attr temp_pwr_info;

	bool restore_pwr_mode = false;



	if (!hba)

		return -EINVAL;



	if (hba->quirks & UFSHCD_QUIRK_DME_PEER_GET_FAST_MODE) {

		orig_pwr_info = hba->pwr_info;

		temp_pwr_info = orig_pwr_info;

		if (orig_pwr_info.pwr_tx == FAST_MODE ||

		    orig_pwr_info.pwr_rx == FAST_MODE) {

			temp_pwr_info.pwr_tx = FASTAUTO_MODE;

			temp_pwr_info.pwr_rx = FASTAUTO_MODE;

			ret = ufsdbg_config_pwr_mode(hba, &temp_pwr_info);

			if (ret)

				goto out;

			else

				restore_pwr_mode = true;

		}

	}



	ret = ufsdbg_dme_read(data, attr_val, true);



	if (hba->quirks & UFSHCD_QUIRK_DME_PEER_GET_FAST_MODE) {

		if (restore_pwr_mode)

			ufsdbg_config_pwr_mode(hba, &orig_pwr_info);

	}



out:

	return ret;

}



static int ufsdbg_dme_peer_set_attr_id(void *data, u64 attr_id)

{

	struct ufs_hba *hba = data;



	if (!hba)

		return -EINVAL;



	hba->debugfs_files.dme_peer_attr_id = (u32)attr_id;



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(ufsdbg_dme_peer_read_ops,

			ufsdbg_dme_peer_read,

			ufsdbg_dme_peer_set_attr_id,

			"%llu\n");



void ufsdbg_add_debugfs(struct ufs_hba *hba)

{

	if (!hba) {
@@ -962,6 +1033,17 @@ void ufsdbg_add_debugfs(struct ufs_hba *hba) 
		goto err;

	}



	hba->debugfs_files.dme_peer_read =

		debugfs_create_file("dme_peer_read", S_IRUSR | S_IWUSR,

				    hba->debugfs_files.debugfs_root, hba,

				    &ufsdbg_dme_peer_read_ops);

	if (!hba->debugfs_files.dme_peer_read) {

		dev_err(hba->dev,

			"%s:  failed create dme_peer_read debugfs entry\n",

			__func__);

		goto err;

	}



	ufsdbg_setup_fault_injection(hba);



	return;

drivers/scsi/ufs/ufs-qcom.c

+2 −0
Original line number Diff line number Diff line
@@ -754,6 +754,8 @@ static void ufs_qcom_advertise_quirks(struct ufs_hba *hba) 
		hba->quirks |= (UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS

			      | UFSHCD_QUIRK_BROKEN_PA_RXHSUNTERMCAP

			      | UFSHCD_QUIRK_BROKEN_LCC);



	hba->quirks |= UFSHCD_QUIRK_DME_PEER_GET_FAST_MODE;

}



static int ufs_qcom_get_bus_vote(struct ufs_qcom_host *host,

drivers/scsi/ufs/ufshcd.c

+2 −0
Original line number Diff line number Diff line
@@ -2777,6 +2777,7 @@ int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, u64 wait_timeout_us) 
	bool timeout = false;

	ktime_t start = ktime_get();



	ufshcd_hold(hba, false);

	spin_lock_irqsave(hba->host->host_lock, flags);

	if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL) {

		ret = -EBUSY;
@@ -2811,6 +2812,7 @@ int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, u64 wait_timeout_us) 
	}

out:

	spin_unlock_irqrestore(hba->host->host_lock, flags);

	ufshcd_release(hba);

	return ret;

}

include/linux/scsi/ufs/ufshcd.h

+2 −0
Original line number Diff line number Diff line
@@ -378,7 +378,9 @@ struct debugfs_files { 
	struct dentry *dump_dev_desc;

	struct dentry *power_mode;

	struct dentry *dme_local_read;

	struct dentry *dme_peer_read;

	u32 dme_local_attr_id;

	u32 dme_peer_attr_id;

#ifdef CONFIG_UFS_FAULT_INJECTION

	struct fault_attr fail_attr;

#endif