From acf7e50a6ba056d668de07b9eadcf6fe9395f167 Mon Sep 17 00:00:00 2001 From: Anup Patel Date: Tue, 1 Aug 2017 16:05:51 +0530 Subject: 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 Reviewed-by: Vikram Prakash Reviewed-by: Scott Branden Signed-off-by: Jassi Brar --- drivers/mailbox/bcm-flexrm-mailbox.c | 136 ++++++++++++++++++++++++++++++++++- 1 file changed, 134 insertions(+), 2 deletions(-) diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c index e8c3666e94cf..a0be2ea925fb 100644 --- a/drivers/mailbox/bcm-flexrm-mailbox.c +++ b/drivers/mailbox/bcm-flexrm-mailbox.c @@ -17,6 +17,8 @@ #include #include +#include +#include #include #include #include @@ -270,6 +272,9 @@ struct flexrm_ring { u32 bd_write_offset; void *cmpl_base; dma_addr_t cmpl_dma_base; + /* Atomic stats */ + atomic_t msg_send_count; + atomic_t msg_cmpl_count; /* Protected members */ spinlock_t lock; struct brcm_message *last_pending_msg; @@ -283,6 +288,9 @@ struct flexrm_mbox { struct flexrm_ring *rings; struct dma_pool *bd_pool; struct dma_pool *cmpl_pool; + struct dentry *root; + struct dentry *config; + struct dentry *stats; struct mbox_controller controller; }; @@ -913,6 +921,62 @@ static void *flexrm_write_descs(struct brcm_message *msg, u32 nhcnt, /* ====== FlexRM driver helper routines ===== */ +static void flexrm_write_config_in_seqfile(struct flexrm_mbox *mbox, + struct seq_file *file) +{ + int i; + const char *state; + struct flexrm_ring *ring; + + seq_printf(file, "%-5s %-9s %-18s %-10s %-18s %-10s\n", + "Ring#", "State", "BD_Addr", "BD_Size", + "Cmpl_Addr", "Cmpl_Size"); + + for (i = 0; i < mbox->num_rings; i++) { + ring = &mbox->rings[i]; + if (readl(ring->regs + RING_CONTROL) & + BIT(CONTROL_ACTIVE_SHIFT)) + state = "active"; + else + state = "inactive"; + seq_printf(file, + "%-5d %-9s 0x%016llx 0x%08x 0x%016llx 0x%08x\n", + ring->num, state, + (unsigned long long)ring->bd_dma_base, + (u32)RING_BD_SIZE, + (unsigned long long)ring->cmpl_dma_base, + (u32)RING_CMPL_SIZE); + } +} + +static void flexrm_write_stats_in_seqfile(struct flexrm_mbox *mbox, + struct seq_file *file) +{ + int i; + u32 val, bd_read_offset; + struct flexrm_ring *ring; + + seq_printf(file, "%-5s %-10s %-10s %-10s %-11s %-11s\n", + "Ring#", "BD_Read", "BD_Write", + "Cmpl_Read", "Submitted", "Completed"); + + for (i = 0; i < mbox->num_rings; i++) { + ring = &mbox->rings[i]; + bd_read_offset = readl_relaxed(ring->regs + RING_BD_READ_PTR); + val = readl_relaxed(ring->regs + RING_BD_START_ADDR); + bd_read_offset *= RING_DESC_SIZE; + bd_read_offset += (u32)(BD_START_ADDR_DECODE(val) - + ring->bd_dma_base); + seq_printf(file, "%-5d 0x%08x 0x%08x 0x%08x %-11d %-11d\n", + ring->num, + (u32)bd_read_offset, + (u32)ring->bd_write_offset, + (u32)ring->cmpl_read_offset, + (u32)atomic_read(&ring->msg_send_count), + (u32)atomic_read(&ring->msg_cmpl_count)); + } +} + static int flexrm_new_request(struct flexrm_ring *ring, struct brcm_message *batch_msg, struct brcm_message *msg) @@ -1013,6 +1077,9 @@ static int flexrm_new_request(struct flexrm_ring *ring, /* Save ring BD write offset */ ring->bd_write_offset = (unsigned long)(next - ring->bd_base); + /* Increment number of messages sent */ + atomic_inc_return(&ring->msg_send_count); + exit: /* Update error status in message */ msg->error = ret; @@ -1106,12 +1173,37 @@ static int flexrm_process_completions(struct flexrm_ring *ring) mbox_chan_received_data(chan, msg); /* Increment number of completions processed */ + atomic_inc_return(&ring->msg_cmpl_count); count++; } return count; } +/* ====== FlexRM Debugfs callbacks ====== */ + +static int flexrm_debugfs_conf_show(struct seq_file *file, void *offset) +{ + struct platform_device *pdev = to_platform_device(file->private); + struct flexrm_mbox *mbox = platform_get_drvdata(pdev); + + /* Write config in file */ + flexrm_write_config_in_seqfile(mbox, file); + + return 0; +} + +static int flexrm_debugfs_stats_show(struct seq_file *file, void *offset) +{ + struct platform_device *pdev = to_platform_device(file->private); + struct flexrm_mbox *mbox = platform_get_drvdata(pdev); + + /* Write stats in file */ + flexrm_write_stats_in_seqfile(mbox, file); + + return 0; +} + /* ====== FlexRM interrupt handler ===== */ static irqreturn_t flexrm_irq_event(int irq, void *dev_id) @@ -1272,6 +1364,10 @@ static int flexrm_startup(struct mbox_chan *chan) val = BIT(CONTROL_ACTIVE_SHIFT); writel_relaxed(val, ring->regs + RING_CONTROL); + /* Reset stats to zero */ + atomic_set(&ring->msg_send_count, 0); + atomic_set(&ring->msg_cmpl_count, 0); + return 0; fail_free_irq: @@ -1491,6 +1587,8 @@ static int flexrm_mbox_probe(struct platform_device *pdev) ring->bd_dma_base = 0; ring->cmpl_base = NULL; ring->cmpl_dma_base = 0; + atomic_set(&ring->msg_send_count, 0); + atomic_set(&ring->msg_cmpl_count, 0); spin_lock_init(&ring->lock); ring->last_pending_msg = NULL; ring->cmpl_read_offset = 0; @@ -1532,6 +1630,36 @@ static int flexrm_mbox_probe(struct platform_device *pdev) ring->irq = desc->irq; } + /* Check availability of debugfs */ + if (!debugfs_initialized()) + goto skip_debugfs; + + /* Create debugfs root entry */ + mbox->root = debugfs_create_dir(dev_name(mbox->dev), NULL); + if (IS_ERR_OR_NULL(mbox->root)) { + ret = PTR_ERR_OR_ZERO(mbox->root); + goto fail_free_msis; + } + + /* Create debugfs config entry */ + mbox->config = debugfs_create_devm_seqfile(mbox->dev, + "config", mbox->root, + flexrm_debugfs_conf_show); + if (IS_ERR_OR_NULL(mbox->config)) { + ret = PTR_ERR_OR_ZERO(mbox->config); + goto fail_free_debugfs_root; + } + + /* Create debugfs stats entry */ + mbox->stats = debugfs_create_devm_seqfile(mbox->dev, + "stats", mbox->root, + flexrm_debugfs_stats_show); + if (IS_ERR_OR_NULL(mbox->stats)) { + ret = PTR_ERR_OR_ZERO(mbox->stats); + goto fail_free_debugfs_root; + } +skip_debugfs: + /* Initialize mailbox controller */ mbox->controller.txdone_irq = false; mbox->controller.txdone_poll = true; @@ -1544,7 +1672,7 @@ static int flexrm_mbox_probe(struct platform_device *pdev) sizeof(*mbox->controller.chans), GFP_KERNEL); if (!mbox->controller.chans) { ret = -ENOMEM; - goto fail_free_msis; + goto fail_free_debugfs_root; } for (index = 0; index < mbox->num_rings; index++) mbox->controller.chans[index].con_priv = &mbox->rings[index]; @@ -1552,13 +1680,15 @@ static int flexrm_mbox_probe(struct platform_device *pdev) /* Register mailbox controller */ ret = mbox_controller_register(&mbox->controller); if (ret) - goto fail_free_msis; + goto fail_free_debugfs_root; dev_info(dev, "registered flexrm mailbox with %d channels\n", mbox->controller.num_chans); return 0; +fail_free_debugfs_root: + debugfs_remove_recursive(mbox->root); fail_free_msis: platform_msi_domain_free_irqs(dev); fail_destroy_cmpl_pool: @@ -1578,6 +1708,8 @@ static int flexrm_mbox_remove(struct platform_device *pdev) mbox_controller_unregister(&mbox->controller); + debugfs_remove_recursive(mbox->root); + platform_msi_domain_free_irqs(dev); dma_pool_destroy(mbox->cmpl_pool); -- cgit v1.2.3