mailbox: bcm-flexrm-mailbox: Add debugfs support
This patch adds debugfs support to Broadcom FlexRM driver so that we can see FlexRM ring state when any issue happens. Signed-off-by: Anup Patel <anup.patel@broadcom.com> Reviewed-by: Vikram Prakash <vikram.prakash@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Anup Patel
Jassi Brar
parent
6ac17fe8c1
commit
acf7e50a6b
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@ -17,6 +17,8 @@
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#include <asm/barrier.h>
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#include <asm/byteorder.h>
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#include <linux/atomic.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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@ -270,6 +272,9 @@ struct flexrm_ring {
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u32 bd_write_offset;
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void *cmpl_base;
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dma_addr_t cmpl_dma_base;
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/* Atomic stats */
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atomic_t msg_send_count;
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atomic_t msg_cmpl_count;
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/* Protected members */
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spinlock_t lock;
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struct brcm_message *last_pending_msg;
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@ -283,6 +288,9 @@ struct flexrm_mbox {
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struct flexrm_ring *rings;
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struct dma_pool *bd_pool;
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struct dma_pool *cmpl_pool;
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struct dentry *root;
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struct dentry *config;
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struct dentry *stats;
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struct mbox_controller controller;
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};
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@ -913,6 +921,62 @@ static void *flexrm_write_descs(struct brcm_message *msg, u32 nhcnt,
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/* ====== FlexRM driver helper routines ===== */
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static void flexrm_write_config_in_seqfile(struct flexrm_mbox *mbox,
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struct seq_file *file)
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{
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int i;
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const char *state;
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struct flexrm_ring *ring;
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seq_printf(file, "%-5s %-9s %-18s %-10s %-18s %-10s\n",
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"Ring#", "State", "BD_Addr", "BD_Size",
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"Cmpl_Addr", "Cmpl_Size");
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for (i = 0; i < mbox->num_rings; i++) {
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ring = &mbox->rings[i];
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if (readl(ring->regs + RING_CONTROL) &
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BIT(CONTROL_ACTIVE_SHIFT))
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state = "active";
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else
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state = "inactive";
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seq_printf(file,
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"%-5d %-9s 0x%016llx 0x%08x 0x%016llx 0x%08x\n",
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ring->num, state,
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(unsigned long long)ring->bd_dma_base,
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(u32)RING_BD_SIZE,
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(unsigned long long)ring->cmpl_dma_base,
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(u32)RING_CMPL_SIZE);
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}
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}
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static void flexrm_write_stats_in_seqfile(struct flexrm_mbox *mbox,
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struct seq_file *file)
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{
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int i;
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u32 val, bd_read_offset;
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struct flexrm_ring *ring;
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seq_printf(file, "%-5s %-10s %-10s %-10s %-11s %-11s\n",
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"Ring#", "BD_Read", "BD_Write",
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"Cmpl_Read", "Submitted", "Completed");
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for (i = 0; i < mbox->num_rings; i++) {
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ring = &mbox->rings[i];
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bd_read_offset = readl_relaxed(ring->regs + RING_BD_READ_PTR);
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val = readl_relaxed(ring->regs + RING_BD_START_ADDR);
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bd_read_offset *= RING_DESC_SIZE;
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bd_read_offset += (u32)(BD_START_ADDR_DECODE(val) -
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ring->bd_dma_base);
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seq_printf(file, "%-5d 0x%08x 0x%08x 0x%08x %-11d %-11d\n",
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ring->num,
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(u32)bd_read_offset,
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(u32)ring->bd_write_offset,
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(u32)ring->cmpl_read_offset,
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(u32)atomic_read(&ring->msg_send_count),
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(u32)atomic_read(&ring->msg_cmpl_count));
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}
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}
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static int flexrm_new_request(struct flexrm_ring *ring,
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struct brcm_message *batch_msg,
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struct brcm_message *msg)
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@ -1013,6 +1077,9 @@ static int flexrm_new_request(struct flexrm_ring *ring,
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/* Save ring BD write offset */
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ring->bd_write_offset = (unsigned long)(next - ring->bd_base);
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/* Increment number of messages sent */
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atomic_inc_return(&ring->msg_send_count);
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exit:
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/* Update error status in message */
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msg->error = ret;
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@ -1106,12 +1173,37 @@ static int flexrm_process_completions(struct flexrm_ring *ring)
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mbox_chan_received_data(chan, msg);
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/* Increment number of completions processed */
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atomic_inc_return(&ring->msg_cmpl_count);
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count++;
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}
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return count;
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}
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/* ====== FlexRM Debugfs callbacks ====== */
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static int flexrm_debugfs_conf_show(struct seq_file *file, void *offset)
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{
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struct platform_device *pdev = to_platform_device(file->private);
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struct flexrm_mbox *mbox = platform_get_drvdata(pdev);
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/* Write config in file */
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flexrm_write_config_in_seqfile(mbox, file);
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return 0;
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}
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static int flexrm_debugfs_stats_show(struct seq_file *file, void *offset)
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{
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struct platform_device *pdev = to_platform_device(file->private);
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struct flexrm_mbox *mbox = platform_get_drvdata(pdev);
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/* Write stats in file */
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flexrm_write_stats_in_seqfile(mbox, file);
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return 0;
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}
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/* ====== FlexRM interrupt handler ===== */
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static irqreturn_t flexrm_irq_event(int irq, void *dev_id)
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@ -1272,6 +1364,10 @@ static int flexrm_startup(struct mbox_chan *chan)
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val = BIT(CONTROL_ACTIVE_SHIFT);
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writel_relaxed(val, ring->regs + RING_CONTROL);
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/* Reset stats to zero */
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atomic_set(&ring->msg_send_count, 0);
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atomic_set(&ring->msg_cmpl_count, 0);
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return 0;
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fail_free_irq:
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@ -1491,6 +1587,8 @@ static int flexrm_mbox_probe(struct platform_device *pdev)
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ring->bd_dma_base = 0;
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ring->cmpl_base = NULL;
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ring->cmpl_dma_base = 0;
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atomic_set(&ring->msg_send_count, 0);
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atomic_set(&ring->msg_cmpl_count, 0);
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spin_lock_init(&ring->lock);
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ring->last_pending_msg = NULL;
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ring->cmpl_read_offset = 0;
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@ -1532,6 +1630,36 @@ static int flexrm_mbox_probe(struct platform_device *pdev)
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ring->irq = desc->irq;
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}
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/* Check availability of debugfs */
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if (!debugfs_initialized())
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goto skip_debugfs;
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/* Create debugfs root entry */
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mbox->root = debugfs_create_dir(dev_name(mbox->dev), NULL);
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if (IS_ERR_OR_NULL(mbox->root)) {
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ret = PTR_ERR_OR_ZERO(mbox->root);
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goto fail_free_msis;
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}
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/* Create debugfs config entry */
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mbox->config = debugfs_create_devm_seqfile(mbox->dev,
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"config", mbox->root,
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flexrm_debugfs_conf_show);
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if (IS_ERR_OR_NULL(mbox->config)) {
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ret = PTR_ERR_OR_ZERO(mbox->config);
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goto fail_free_debugfs_root;
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}
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/* Create debugfs stats entry */
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mbox->stats = debugfs_create_devm_seqfile(mbox->dev,
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"stats", mbox->root,
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flexrm_debugfs_stats_show);
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if (IS_ERR_OR_NULL(mbox->stats)) {
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ret = PTR_ERR_OR_ZERO(mbox->stats);
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goto fail_free_debugfs_root;
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}
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skip_debugfs:
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/* Initialize mailbox controller */
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mbox->controller.txdone_irq = false;
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mbox->controller.txdone_poll = true;
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@ -1544,7 +1672,7 @@ static int flexrm_mbox_probe(struct platform_device *pdev)
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sizeof(*mbox->controller.chans), GFP_KERNEL);
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if (!mbox->controller.chans) {
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ret = -ENOMEM;
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goto fail_free_msis;
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goto fail_free_debugfs_root;
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}
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for (index = 0; index < mbox->num_rings; index++)
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mbox->controller.chans[index].con_priv = &mbox->rings[index];
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@ -1552,13 +1680,15 @@ static int flexrm_mbox_probe(struct platform_device *pdev)
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/* Register mailbox controller */
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ret = mbox_controller_register(&mbox->controller);
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if (ret)
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goto fail_free_msis;
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goto fail_free_debugfs_root;
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dev_info(dev, "registered flexrm mailbox with %d channels\n",
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mbox->controller.num_chans);
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return 0;
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fail_free_debugfs_root:
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debugfs_remove_recursive(mbox->root);
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fail_free_msis:
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platform_msi_domain_free_irqs(dev);
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fail_destroy_cmpl_pool:
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@ -1578,6 +1708,8 @@ static int flexrm_mbox_remove(struct platform_device *pdev)
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mbox_controller_unregister(&mbox->controller);
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debugfs_remove_recursive(mbox->root);
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platform_msi_domain_free_irqs(dev);
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dma_pool_destroy(mbox->cmpl_pool);
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