Commit e495e523 authored by Jeff Hugo's avatar Jeff Hugo
Browse files

accel/qaic: Add fifo queued debugfs 



When debugging functional issues with workload input processing, it is
useful to know if requests are backing up in the fifo, or perhaps
getting stuck elsewhere. To answer the question of how many requests are
in the fifo, implement a "queued" debugfs entry per-dbc that returns the
number of pending requests when read.

Signed-off-by: default avatarJeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: default avatarCarl Vanderlip <quic_carlv@quicinc.com>
Reviewed-by: default avatarPranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: default avatarJacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240322175730.3855440-4-quic_jhugo@quicinc.com
parent b05d3572

drivers/accel/qaic/qaic.h

+1 −0
Original line number Diff line number Diff line
@@ -288,6 +288,7 @@ int disable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr); 
void enable_dbc(struct qaic_device *qdev, u32 dbc_id, struct qaic_user *usr);

void wakeup_dbc(struct qaic_device *qdev, u32 dbc_id);

void release_dbc(struct qaic_device *qdev, u32 dbc_id);

void qaic_data_get_fifo_info(struct dma_bridge_chan *dbc, u32 *head, u32 *tail);



void wake_all_cntl(struct qaic_device *qdev);

void qaic_dev_reset_clean_local_state(struct qaic_device *qdev);

drivers/accel/qaic/qaic_data.c

+9 −0
Original line number Diff line number Diff line
@@ -1981,3 +1981,12 @@ void release_dbc(struct qaic_device *qdev, u32 dbc_id) 
	dbc->in_use = false;

	wake_up(&dbc->dbc_release);

}



void qaic_data_get_fifo_info(struct dma_bridge_chan *dbc, u32 *head, u32 *tail)

{

	if (!dbc || !head || !tail)

		return;



	*head = readl(dbc->dbc_base + REQHP_OFF);

	*tail = readl(dbc->dbc_base + REQTP_OFF);

}

drivers/accel/qaic/qaic_debugfs.c

+31 −0
Original line number Diff line number Diff line
@@ -98,6 +98,36 @@ static const struct file_operations fifo_size_fops = { 
	.release = single_release,

};



static int read_dbc_queued(struct seq_file *s, void *unused)

{

	struct dma_bridge_chan *dbc = s->private;

	u32 tail = 0, head = 0;



	qaic_data_get_fifo_info(dbc, &head, &tail);



	if (head == U32_MAX || tail == U32_MAX)

		seq_printf(s, "%u\n", 0);

	else if (head > tail)

		seq_printf(s, "%u\n", dbc->nelem - head + tail);

	else

		seq_printf(s, "%u\n", tail - head);



	return 0;

}



static int queued_open(struct inode *inode, struct file *file)

{

	return single_open(file, read_dbc_queued, inode->i_private);

}



static const struct file_operations queued_fops = {

	.owner = THIS_MODULE,

	.open = queued_open,

	.read = seq_read,

	.llseek = seq_lseek,

	.release = single_release,

};



void qaic_debugfs_init(struct qaic_drm_device *qddev)

{

	struct qaic_device *qdev = qddev->qdev;
@@ -117,6 +147,7 @@ void qaic_debugfs_init(struct qaic_drm_device *qddev) 
		snprintf(name, QAIC_DBC_DIR_NAME, "dbc%03u", i);

		debugfs_dir = debugfs_create_dir(name, debugfs_root);

		debugfs_create_file("fifo_size", 0400, debugfs_dir, &qdev->dbc[i], &fifo_size_fops);

		debugfs_create_file("queued", 0400, debugfs_dir, &qdev->dbc[i], &queued_fops);

	}

}