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dmaengine: ptdma: Add debugfs entries for PTDMA

Browse source 
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>
This commit is contained in:
Sanjay R Mehta 2021-08-17 08:55:59 -05:00 committed by Vinod Koul
parent b0b4a6b105
commit e2fb2e2a33
4 changed files with 118 additions and 1 deletions
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2
drivers/dma/ptdma/Makefile
View file

@ -5,6 +5,6 @@
obj-$(CONFIG_AMD_PTDMA) += ptdma.o
ptdma-objs := ptdma-dev.o ptdma-dmaengine.o
ptdma-objs := ptdma-dev.o ptdma-dmaengine.o ptdma-debugfs.o
ptdma-$(CONFIG_PCI) += ptdma-pci.o

106
drivers/dma/ptdma/ptdma-debugfs.c Normal file
View file

@ -0,0 +1,106 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* AMD Passthrough DMA device driver
* -- Based on the CCP driver
*
* Copyright (C) 2016,2021 Advanced Micro Devices, Inc.
*
* Author: Sanjay R Mehta <sanju.mehta@amd.com>
* Author: Gary R Hook <gary.hook@amd.com>
*/
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include "ptdma.h"
/* DebugFS helpers */
#define RI_VERSION_NUM 0x0000003F
#define RI_NUM_VQM 0x00078000
#define RI_NVQM_SHIFT 15
static int pt_debugfs_info_show(struct seq_file *s, void *p)
{
struct pt_device *pt = s->private;
unsigned int regval;
seq_printf(s, "Device name: %s\n", dev_name(pt->dev));
seq_printf(s, " # Queues: %d\n", 1);
seq_printf(s, " # Cmds: %d\n", pt->cmd_count);
regval = ioread32(pt->io_regs + CMD_PT_VERSION);
seq_printf(s, " Version: %d\n", regval & RI_VERSION_NUM);
seq_puts(s, " Engines:");
seq_puts(s, "\n");
seq_printf(s, " Queues: %d\n", (regval & RI_NUM_VQM) >> RI_NVQM_SHIFT);
return 0;
}
/*
* Return a formatted buffer containing the current
* statistics of queue for PTDMA
*/
static int pt_debugfs_stats_show(struct seq_file *s, void *p)
{
struct pt_device *pt = s->private;
seq_printf(s, "Total Interrupts Handled: %ld\n", pt->total_interrupts);
return 0;
}
static int pt_debugfs_queue_show(struct seq_file *s, void *p)
{
struct pt_cmd_queue *cmd_q = s->private;
unsigned int regval;
if (!cmd_q)
return 0;
seq_printf(s, " Pass-Thru: %ld\n", cmd_q->total_pt_ops);
regval = ioread32(cmd_q->reg_control + 0x000C);
seq_puts(s, " Enabled Interrupts:");
if (regval & INT_EMPTY_QUEUE)
seq_puts(s, " EMPTY");
if (regval & INT_QUEUE_STOPPED)
seq_puts(s, " STOPPED");
if (regval & INT_ERROR)
seq_puts(s, " ERROR");
if (regval & INT_COMPLETION)
seq_puts(s, " COMPLETION");
seq_puts(s, "\n");
return 0;
}
DEFINE_SHOW_ATTRIBUTE(pt_debugfs_info);
DEFINE_SHOW_ATTRIBUTE(pt_debugfs_queue);
DEFINE_SHOW_ATTRIBUTE(pt_debugfs_stats);
void ptdma_debugfs_setup(struct pt_device *pt)
{
struct pt_cmd_queue *cmd_q;
struct dentry *debugfs_q_instance;
if (!debugfs_initialized())
return;
debugfs_create_file("info", 0400, pt->dma_dev.dbg_dev_root, pt,
&pt_debugfs_info_fops);
debugfs_create_file("stats", 0400, pt->dma_dev.dbg_dev_root, pt,
&pt_debugfs_stats_fops);
cmd_q = &pt->cmd_q;
debugfs_q_instance =
debugfs_create_dir("q", pt->dma_dev.dbg_dev_root);
debugfs_create_file("stats", 0400, debugfs_q_instance, cmd_q,
&pt_debugfs_queue_fops);
}

5
drivers/dma/ptdma/ptdma-dev.c
View file

@ -102,6 +102,7 @@ int pt_core_perform_passthru(struct pt_cmd_queue *cmd_q,
struct ptdma_desc desc;
cmd_q->cmd_error = 0;
cmd_q->total_pt_ops++;
memset(&desc, 0, sizeof(desc));
desc.dw0 = CMD_DESC_DW0_VAL;
desc.length = pt_engine->src_len;
@ -150,6 +151,7 @@ static irqreturn_t pt_core_irq_handler(int irq, void *data)
u32 status;
pt_core_disable_queue_interrupts(pt);
pt->total_interrupts++;
status = ioread32(cmd_q->reg_control + 0x0010);
if (status) {
cmd_q->int_status = status;
@ -250,6 +252,9 @@ int pt_core_init(struct pt_device *pt)
if (ret)
goto e_dmaengine;
/* Set up debugfs entries */
ptdma_debugfs_setup(pt);
return 0;
e_dmaengine:

6
drivers/dma/ptdma/ptdma.h
View file

@ -216,6 +216,8 @@ struct pt_cmd_queue {
u32 q_status;
u32 q_int_status;
u32 cmd_error;
/* Queue Statistics */
unsigned long total_pt_ops;
} ____cacheline_aligned;
struct pt_device {
@ -254,6 +256,9 @@ struct pt_device {
wait_queue_head_t lsb_queue;
/* Device Statistics */
unsigned long total_interrupts;
struct pt_tasklet_data tdata;
};
@ -307,6 +312,7 @@ struct pt_dev_vdata {
int pt_dmaengine_register(struct pt_device *pt);
void pt_dmaengine_unregister(struct pt_device *pt);
void ptdma_debugfs_setup(struct pt_device *pt);
int pt_core_init(struct pt_device *pt);
void pt_core_destroy(struct pt_device *pt);