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dmaengine: ptdma: Add debugfs entries for PTDMA
Expose data about the configuration and operation of the PTDMA through debugfs entries: device name, capabilities, configuration, statistics. Signed-off-by: Sanjay R Mehta <sanju.mehta@amd.com> Link: https://lore.kernel.org/r/1629208559-51964-4-git-send-email-Sanju.Mehta@amd.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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@ -5,6 +5,6 @@
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obj-$(CONFIG_AMD_PTDMA) += ptdma.o
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ptdma-objs := ptdma-dev.o ptdma-dmaengine.o
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ptdma-objs := ptdma-dev.o ptdma-dmaengine.o ptdma-debugfs.o
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ptdma-$(CONFIG_PCI) += ptdma-pci.o
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106
drivers/dma/ptdma/ptdma-debugfs.c
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106
drivers/dma/ptdma/ptdma-debugfs.c
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@ -0,0 +1,106 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* AMD Passthrough DMA device driver
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* -- Based on the CCP driver
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*
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* Copyright (C) 2016,2021 Advanced Micro Devices, Inc.
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*
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* Author: Sanjay R Mehta <sanju.mehta@amd.com>
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* Author: Gary R Hook <gary.hook@amd.com>
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*/
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include "ptdma.h"
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/* DebugFS helpers */
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#define RI_VERSION_NUM 0x0000003F
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#define RI_NUM_VQM 0x00078000
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#define RI_NVQM_SHIFT 15
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static int pt_debugfs_info_show(struct seq_file *s, void *p)
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{
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struct pt_device *pt = s->private;
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unsigned int regval;
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seq_printf(s, "Device name: %s\n", dev_name(pt->dev));
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seq_printf(s, " # Queues: %d\n", 1);
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seq_printf(s, " # Cmds: %d\n", pt->cmd_count);
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regval = ioread32(pt->io_regs + CMD_PT_VERSION);
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seq_printf(s, " Version: %d\n", regval & RI_VERSION_NUM);
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seq_puts(s, " Engines:");
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seq_puts(s, "\n");
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seq_printf(s, " Queues: %d\n", (regval & RI_NUM_VQM) >> RI_NVQM_SHIFT);
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return 0;
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}
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/*
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* Return a formatted buffer containing the current
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* statistics of queue for PTDMA
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*/
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static int pt_debugfs_stats_show(struct seq_file *s, void *p)
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{
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struct pt_device *pt = s->private;
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seq_printf(s, "Total Interrupts Handled: %ld\n", pt->total_interrupts);
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return 0;
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}
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static int pt_debugfs_queue_show(struct seq_file *s, void *p)
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{
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struct pt_cmd_queue *cmd_q = s->private;
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unsigned int regval;
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if (!cmd_q)
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return 0;
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seq_printf(s, " Pass-Thru: %ld\n", cmd_q->total_pt_ops);
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regval = ioread32(cmd_q->reg_control + 0x000C);
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seq_puts(s, " Enabled Interrupts:");
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if (regval & INT_EMPTY_QUEUE)
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seq_puts(s, " EMPTY");
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if (regval & INT_QUEUE_STOPPED)
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seq_puts(s, " STOPPED");
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if (regval & INT_ERROR)
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seq_puts(s, " ERROR");
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if (regval & INT_COMPLETION)
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seq_puts(s, " COMPLETION");
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seq_puts(s, "\n");
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(pt_debugfs_info);
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DEFINE_SHOW_ATTRIBUTE(pt_debugfs_queue);
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DEFINE_SHOW_ATTRIBUTE(pt_debugfs_stats);
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void ptdma_debugfs_setup(struct pt_device *pt)
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{
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struct pt_cmd_queue *cmd_q;
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struct dentry *debugfs_q_instance;
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if (!debugfs_initialized())
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return;
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debugfs_create_file("info", 0400, pt->dma_dev.dbg_dev_root, pt,
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&pt_debugfs_info_fops);
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debugfs_create_file("stats", 0400, pt->dma_dev.dbg_dev_root, pt,
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&pt_debugfs_stats_fops);
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cmd_q = &pt->cmd_q;
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debugfs_q_instance =
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debugfs_create_dir("q", pt->dma_dev.dbg_dev_root);
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debugfs_create_file("stats", 0400, debugfs_q_instance, cmd_q,
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&pt_debugfs_queue_fops);
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}
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@ -102,6 +102,7 @@ int pt_core_perform_passthru(struct pt_cmd_queue *cmd_q,
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struct ptdma_desc desc;
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cmd_q->cmd_error = 0;
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cmd_q->total_pt_ops++;
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memset(&desc, 0, sizeof(desc));
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desc.dw0 = CMD_DESC_DW0_VAL;
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desc.length = pt_engine->src_len;
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@ -150,6 +151,7 @@ static irqreturn_t pt_core_irq_handler(int irq, void *data)
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u32 status;
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pt_core_disable_queue_interrupts(pt);
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pt->total_interrupts++;
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status = ioread32(cmd_q->reg_control + 0x0010);
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if (status) {
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cmd_q->int_status = status;
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@ -250,6 +252,9 @@ int pt_core_init(struct pt_device *pt)
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if (ret)
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goto e_dmaengine;
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/* Set up debugfs entries */
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ptdma_debugfs_setup(pt);
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return 0;
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e_dmaengine:
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@ -216,6 +216,8 @@ struct pt_cmd_queue {
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u32 q_status;
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u32 q_int_status;
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u32 cmd_error;
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/* Queue Statistics */
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unsigned long total_pt_ops;
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} ____cacheline_aligned;
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struct pt_device {
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@ -254,6 +256,9 @@ struct pt_device {
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wait_queue_head_t lsb_queue;
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/* Device Statistics */
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unsigned long total_interrupts;
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struct pt_tasklet_data tdata;
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};
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@ -307,6 +312,7 @@ struct pt_dev_vdata {
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int pt_dmaengine_register(struct pt_device *pt);
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void pt_dmaengine_unregister(struct pt_device *pt);
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void ptdma_debugfs_setup(struct pt_device *pt);
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int pt_core_init(struct pt_device *pt);
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void pt_core_destroy(struct pt_device *pt);
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