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SubjectRe: [PATCH v5 3/3] dmaengine: ptdma: Add debugfs entries for PTDMA information
On 16-06-20, 20:11, Sanjay R Mehta wrote:
> From: Sanjay R Mehta <sanju.mehta@amd.com>
>
> 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>
> ---
> drivers/dma/ptdma/Makefile | 3 +-
> drivers/dma/ptdma/ptdma-debugfs.c | 130 ++++++++++++++++++++++++++++++++++++++
> drivers/dma/ptdma/ptdma-dev.c | 8 +++
> drivers/dma/ptdma/ptdma.h | 9 +++
> 4 files changed, 149 insertions(+), 1 deletion(-)
> create mode 100644 drivers/dma/ptdma/ptdma-debugfs.c
>
> diff --git a/drivers/dma/ptdma/Makefile b/drivers/dma/ptdma/Makefile
> index 6fcb4ad..60e7c10 100644
> --- a/drivers/dma/ptdma/Makefile
> +++ b/drivers/dma/ptdma/Makefile
> @@ -6,6 +6,7 @@
> obj-$(CONFIG_AMD_PTDMA) += ptdma.o
>
> ptdma-objs := ptdma-dev.o \
> - ptdma-dmaengine.o
> + ptdma-dmaengine.o \
> + ptdma-debugfs.o
>
> ptdma-$(CONFIG_PCI) += ptdma-pci.o
> diff --git a/drivers/dma/ptdma/ptdma-debugfs.c b/drivers/dma/ptdma/ptdma-debugfs.c
> new file mode 100644
> index 0000000..506c148b
> --- /dev/null
> +++ b/drivers/dma/ptdma/ptdma-debugfs.c
> @@ -0,0 +1,130 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * AMD Passthrough DMA device driver
> + * -- Based on the CCP driver
> + *
> + * Copyright (C) 2016,2020 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 MAX_NAME_LEN 20
> +#define RI_VERSION_NUM 0x0000003F
> +
> +#define RI_NUM_VQM 0x00078000
> +#define RI_NVQM_SHIFT 15
> +
> +static struct dentry *pt_debugfs_dir;
> +static DEFINE_MUTEX(pt_debugfs_lock);
> +
> +static int pt_debugfs_info_show(struct seq_file *s, void *p)
> +{
> + struct pt_device *pt = s->private;
> + unsigned int regval;
> +
> + if (!pt)
> + return 0;
> +
> + seq_printf(s, "Device name: %s\n", pt->name);
> + 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_int_enable);
> +
> + 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;
> + char name[MAX_NAME_LEN + 1];
> + struct dentry *debugfs_q_instance;
> +
> + if (!debugfs_initialized())
> + return;
> +
> + mutex_lock(&pt_debugfs_lock);
> + if (!pt_debugfs_dir)
> + pt_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);

please do not create your own, you already have one under
/sys/kernel/debug/dmaengine/<>/ use that :)

> + mutex_unlock(&pt_debugfs_lock);
> +
> + pt->dma_dev.dbg_dev_root = debugfs_create_dir(pt->name, pt_debugfs_dir);

argh, this is already created by core and you leaked that one and added
your own!

--
~Vinod

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