Re: [PATCH 21/48] drm: omapdrm: dss: Support passing private data to debugfs show handlers

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Hi Laurent,

On Fri, Oct 13, 2017 at 05:59:17PM +0300, Laurent Pinchart wrote:
> To simplify implementation of debugfs seq_file show handlers, the driver
> passes the pointer to the show function through the debugfs_create_file
> data pointer. This prevents using the pointer to pass driver private
> data to the show handler, and requires all handlers to use global
> variables to access private data.
> 
> To prepare for the removal of global private data in the driver, rework
> the debugfs infrastructure to allow passing a private data pointer to
> show handlers.
> 
> The price to pay is explicit removal of debugfs files to free the
> internally allocated memory. This is desirable anyway as debugfs entries
> should be removed when a component driver is unbound, otherwise crashes
> will occur due to access to freed memory when the components will be
> dynamically allocated instead of stored in global variables.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxxxx>

(One nit-pick in dss.h, see below)

-- Sebastian

>  drivers/gpu/drm/omapdrm/dss/dispc.c | 13 ++++--
>  drivers/gpu/drm/omapdrm/dss/dsi.c   | 40 +++++++++++-----
>  drivers/gpu/drm/omapdrm/dss/dss.c   | 92 +++++++++++++++++++++++++------------
>  drivers/gpu/drm/omapdrm/dss/dss.h   | 27 +++++++----
>  drivers/gpu/drm/omapdrm/dss/hdmi.h  |  2 +
>  drivers/gpu/drm/omapdrm/dss/hdmi4.c |  9 ++--
>  drivers/gpu/drm/omapdrm/dss/hdmi5.c |  9 ++--
>  drivers/gpu/drm/omapdrm/dss/venc.c  | 11 +++--
>  8 files changed, 140 insertions(+), 63 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
> index f0ae6be36a4e..1afd2802e807 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dispc.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
> @@ -168,6 +168,8 @@ static struct {
>  	struct platform_device *pdev;
>  	void __iomem    *base;
>  
> +	struct dss_debugfs_entry *debugfs;
> +
>  	int irq;
>  	irq_handler_t user_handler;
>  	void *user_data;
> @@ -3269,7 +3271,7 @@ void dispc_dump_clocks(struct seq_file *s)
>  	dispc_runtime_put();
>  }
>  
> -static void dispc_dump_regs(struct seq_file *s)
> +static int dispc_dump_regs(struct seq_file *s, void *p)
>  {
>  	int i, j;
>  	const char *mgr_names[] = {
> @@ -3290,7 +3292,7 @@ static void dispc_dump_regs(struct seq_file *s)
>  #define DUMPREG(r) seq_printf(s, "%-50s %08x\n", #r, dispc_read_reg(r))
>  
>  	if (dispc_runtime_get())
> -		return;
> +		return 0;
>  
>  	/* DISPC common registers */
>  	DUMPREG(DISPC_REVISION);
> @@ -3462,6 +3464,8 @@ static void dispc_dump_regs(struct seq_file *s)
>  
>  #undef DISPC_REG
>  #undef DUMPREG
> +
> +	return 0;
>  }
>  
>  /* calculate clock rates using dividers in cinfo */
> @@ -4606,7 +4610,8 @@ static int dispc_bind(struct device *dev, struct device *master, void *data)
>  
>  	dispc_set_ops(&dispc_ops);
>  
> -	dss_debugfs_create_file("dispc", dispc_dump_regs);
> +	dispc.debugfs = dss_debugfs_create_file("dispc", dispc_dump_regs,
> +						&dispc);
>  
>  	return 0;
>  
> @@ -4618,6 +4623,8 @@ static int dispc_bind(struct device *dev, struct device *master, void *data)
>  static void dispc_unbind(struct device *dev, struct device *master,
>  			       void *data)
>  {
> +	dss_debugfs_remove_file(dispc.debugfs);
> +
>  	dispc_set_ops(NULL);
>  
>  	pm_runtime_disable(dev);
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index 6a1569149453..a64e6a39ebf1 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -402,6 +402,10 @@ struct dsi_data {
>  #endif
>  	int debug_read;
>  	int debug_write;
> +	struct {
> +		struct dss_debugfs_entry *irqs;
> +		struct dss_debugfs_entry *regs;
> +	} debugfs;
>  
>  #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
>  	spinlock_t irq_stats_lock;
> @@ -1659,18 +1663,20 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev,
>  #undef PIS
>  }
>  
> -static void dsi1_dump_irqs(struct seq_file *s)
> +static int dsi1_dump_irqs(struct seq_file *s, void *p)
>  {
>  	struct platform_device *dsidev = dsi_get_dsidev_from_id(0);
>  
>  	dsi_dump_dsidev_irqs(dsidev, s);
> +	return 0;
>  }
>  
> -static void dsi2_dump_irqs(struct seq_file *s)
> +static int dsi2_dump_irqs(struct seq_file *s, void *p)
>  {
>  	struct platform_device *dsidev = dsi_get_dsidev_from_id(1);
>  
>  	dsi_dump_dsidev_irqs(dsidev, s);
> +	return 0;
>  }
>  #endif
>  
> @@ -1758,18 +1764,20 @@ static void dsi_dump_dsidev_regs(struct platform_device *dsidev,
>  #undef DUMPREG
>  }
>  
> -static void dsi1_dump_regs(struct seq_file *s)
> +static int dsi1_dump_regs(struct seq_file *s, void *p)
>  {
>  	struct platform_device *dsidev = dsi_get_dsidev_from_id(0);
>  
>  	dsi_dump_dsidev_regs(dsidev, s);
> +	return 0;
>  }
>  
> -static void dsi2_dump_regs(struct seq_file *s)
> +static int dsi2_dump_regs(struct seq_file *s, void *p)
>  {
>  	struct platform_device *dsidev = dsi_get_dsidev_from_id(1);
>  
>  	dsi_dump_dsidev_regs(dsidev, s);
> +	return 0;
>  }
>  
>  enum dsi_cio_power_state {
> @@ -5567,15 +5575,22 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
>  	dsi_runtime_put(dsidev);
>  
>  	if (dsi->module_id == 0)
> -		dss_debugfs_create_file("dsi1_regs", dsi1_dump_regs);
> -	else if (dsi->module_id == 1)
> -		dss_debugfs_create_file("dsi2_regs", dsi2_dump_regs);
> -
> +		dsi->debugfs.regs = dss_debugfs_create_file("dsi1_regs",
> +							    dsi1_dump_regs,
> +							    &dsi);
> +	else
> +		dsi->debugfs.regs = dss_debugfs_create_file("dsi2_regs",
> +							    dsi2_dump_regs,
> +							    &dsi);
>  #ifdef CONFIG_OMAP2_DSS_COLLECT_IRQ_STATS
>  	if (dsi->module_id == 0)
> -		dss_debugfs_create_file("dsi1_irqs", dsi1_dump_irqs);
> -	else if (dsi->module_id == 1)
> -		dss_debugfs_create_file("dsi2_irqs", dsi2_dump_irqs);
> +		dsi->debugfs.irqs = dss_debugfs_create_file("dsi1_irqs",
> +							    dsi1_dump_irqs,
> +							    &dsi);
> +	else
> +		dsi->debugfs.irqs = dss_debugfs_create_file("dsi2_irqs",
> +							    dsi2_dump_irqs,
> +							    &dsi);
>  #endif
>  
>  	return 0;
> @@ -5594,6 +5609,9 @@ static void dsi_unbind(struct device *dev, struct device *master, void *data)
>  	struct platform_device *dsidev = to_platform_device(dev);
>  	struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
>  
> +	dss_debugfs_remove_file(dsi->debugfs.irqs);
> +	dss_debugfs_remove_file(dsi->debugfs.regs);
> +
>  	of_platform_depopulate(&dsidev->dev);
>  
>  	WARN_ON(dsi->scp_clk_refcount > 0);
> diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
> index 5721f3d64bdd..b45641f6a844 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dss.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dss.c
> @@ -118,6 +118,11 @@ static struct {
>  
>  	const struct dss_features *feat;
>  
> +	struct {
> +		struct dss_debugfs_entry *clk;
> +		struct dss_debugfs_entry *dss;
> +	} debugfs;
> +
>  	struct dss_pll	*video1_pll;
>  	struct dss_pll	*video2_pll;
>  } dss;
> @@ -393,12 +398,12 @@ static void dss_dump_clocks(struct seq_file *s)
>  }
>  #endif
>  
> -static void dss_dump_regs(struct seq_file *s)
> +static int dss_dump_regs(struct seq_file *s, void *p)
>  {
>  #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, dss_read_reg(r))
>  
>  	if (dss_runtime_get())
> -		return;
> +		return 0;
>  
>  	DUMPREG(DSS_REVISION);
>  	DUMPREG(DSS_SYSCONFIG);
> @@ -413,6 +418,7 @@ static void dss_dump_regs(struct seq_file *s)
>  
>  	dss_runtime_put();
>  #undef DUMPREG
> +	return 0;
>  }
>  
>  static int dss_get_channel_index(enum omap_channel channel)
> @@ -906,35 +912,16 @@ void dss_runtime_put(void)
>  
>  /* DEBUGFS */
>  #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
> -static void dss_debug_dump_clocks(struct seq_file *s)
> +static int dss_debug_dump_clocks(struct seq_file *s, void *p)
>  {
>  	dss_dump_clocks(s);
>  	dispc_dump_clocks(s);
>  #ifdef CONFIG_OMAP2_DSS_DSI
>  	dsi_dump_clocks(s);
>  #endif
> -}
> -
> -static int dss_debug_show(struct seq_file *s, void *unused)
> -{
> -	void (*func)(struct seq_file *) = s->private;
> -
> -	func(s);
>  	return 0;
>  }
>  
> -static int dss_debug_open(struct inode *inode, struct file *file)
> -{
> -	return single_open(file, dss_debug_show, inode->i_private);
> -}
> -
> -static const struct file_operations dss_debug_fops = {
> -	.open           = dss_debug_open,
> -	.read           = seq_read,
> -	.llseek         = seq_lseek,
> -	.release        = single_release,
> -};
> -
>  static struct dentry *dss_debugfs_dir;
>  
>  static int dss_initialize_debugfs(void)
> @@ -947,9 +934,6 @@ static int dss_initialize_debugfs(void)
>  		return err;
>  	}
>  
> -	debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
> -			&dss_debug_dump_clocks, &dss_debug_fops);
> -
>  	return 0;
>  }
>  
> @@ -959,15 +943,59 @@ static void dss_uninitialize_debugfs(void)
>  		debugfs_remove_recursive(dss_debugfs_dir);
>  }
>  
> -int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
> +struct dss_debugfs_entry {
> +	struct dentry *dentry;
> +	int (*show_fn)(struct seq_file *s, void *data);
> +	void *data;
> +};
> +
> +static int dss_debug_open(struct inode *inode, struct file *file)
>  {
> +	struct dss_debugfs_entry *entry = inode->i_private;
> +
> +	return single_open(file, entry->show_fn, entry->data);
> +}
> +
> +static const struct file_operations dss_debug_fops = {
> +	.open		= dss_debug_open,
> +	.read		= seq_read,
> +	.llseek		= seq_lseek,
> +	.release	= single_release,
> +};
> +
> +struct dss_debugfs_entry *dss_debugfs_create_file(const char *name,
> +		int (*show_fn)(struct seq_file *s, void *data), void *data)
> +{
> +	struct dss_debugfs_entry *entry;
>  	struct dentry *d;
>  
> -	d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
> -			write, &dss_debug_fops);
> +	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
> +	if (!entry)
> +		return ERR_PTR(-ENOMEM);
> +
> +	entry->show_fn = show_fn;
> +	entry->data = data;
>  
> -	return PTR_ERR_OR_ZERO(d);
> +	d = debugfs_create_file(name, 0444, dss_debugfs_dir, entry,
> +				&dss_debug_fops);
> +	if (IS_ERR(d)) {
> +		kfree(entry);
> +		return ERR_PTR(PTR_ERR(d));
> +	}
> +
> +	entry->dentry = d;
> +	return entry;
> +}
> +
> +void dss_debugfs_remove_file(struct dss_debugfs_entry *entry)
> +{
> +	if (IS_ERR_OR_NULL(entry))
> +		return;
> +
> +	debugfs_remove(entry->dentry);
> +	kfree(entry);
>  }
> +
>  #else /* CONFIG_OMAP2_DSS_DEBUGFS */
>  static inline int dss_initialize_debugfs(void)
>  {
> @@ -1364,7 +1392,9 @@ static int dss_bind(struct device *dev)
>  	if (r)
>  		goto err_component;
>  
> -	dss_debugfs_create_file("dss", dss_dump_regs);
> +	dss.debugfs.clk = dss_debugfs_create_file("clk", dss_debug_dump_clocks,
> +						  &dss);
> +	dss.debugfs.dss = dss_debugfs_create_file("dss", dss_dump_regs, &dss);
>  
>  	pm_set_vt_switch(0);
>  
> @@ -1377,6 +1407,8 @@ static int dss_bind(struct device *dev)
>  	return 0;
>  
>  err_drm_init:
> +	dss_debugfs_remove_file(dss.debugfs.clk);
> +	dss_debugfs_remove_file(dss.debugfs.dss);
>  	component_unbind_all(&pdev->dev, NULL);
>  err_component:
>  err_runtime_get:
> diff --git a/drivers/gpu/drm/omapdrm/dss/dss.h b/drivers/gpu/drm/omapdrm/dss/dss.h
> index db529481b364..e688e937da28 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dss.h
> +++ b/drivers/gpu/drm/omapdrm/dss/dss.h
> @@ -27,6 +27,11 @@
>  
>  #include "omapdss.h"
>  
> +struct dentry;

You can drop this one. It is not used in dss.h.

> +struct dss_debugfs_entry;
> +struct platform_device;
> +struct seq_file;
> +
>  #define MAX_DSS_LCD_MANAGERS	3
>  #define MAX_NUM_DSI		2
>  
> @@ -234,9 +239,6 @@ struct dss_lcd_mgr_config {
>  	int lcden_sig_polarity;
>  };
>  
> -struct seq_file;
> -struct platform_device;
> -
>  /* core */
>  static inline int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
>  {
> @@ -255,12 +257,20 @@ static inline bool dss_mgr_is_lcd(enum omap_channel id)
>  
>  /* DSS */
>  #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
> -int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *));
> +struct dss_debugfs_entry *dss_debugfs_create_file(const char *name,
> +		int (*show_fn)(struct seq_file *s, void *data), void *data);
> +void dss_debugfs_remove_file(struct dss_debugfs_entry *entry);
>  #else
> -static inline int dss_debugfs_create_file(const char *name,
> -					  void (*write)(struct seq_file *))
> +static inline struct dss_debugfs_entry *
> +dss_debugfs_create_file(const char *name,
> +			int (*show_fn)(struct seq_file *s, void *data),
> +			void *data)
> +{
> +	return NULL;
> +}
> +
> +static inline void dss_debugfs_remove_file(struct dss_debugfs_entry *entry)
>  {
> -	return 0;
>  }
>  #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
>  
> @@ -325,9 +335,6 @@ static inline void sdi_uninit_port(struct device_node *port)
>  
>  #ifdef CONFIG_OMAP2_DSS_DSI
>  
> -struct dentry;
> -struct file_operations;
> -
>  int dsi_init_platform_driver(void) __init;
>  void dsi_uninit_platform_driver(void);
>  
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi.h b/drivers/gpu/drm/omapdrm/dss/hdmi.h
> index c2609c448ddc..a66f8ff06c24 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi.h
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi.h
> @@ -358,6 +358,8 @@ struct omap_hdmi {
>  	struct mutex lock;
>  	struct platform_device *pdev;
>  
> +	struct dss_debugfs_entry *debugfs;
> +
>  	struct hdmi_wp_data	wp;
>  	struct hdmi_pll_data	pll;
>  	struct hdmi_phy_data	phy;
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> index 21ca7bd13fdc..ada4e3a9dba7 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> @@ -302,13 +302,13 @@ static void hdmi_display_get_timings(struct omap_dss_device *dssdev,
>  	*vm = hdmi.cfg.vm;
>  }
>  
> -static void hdmi_dump_regs(struct seq_file *s)
> +static int hdmi_dump_regs(struct seq_file *s, void *p)
>  {
>  	mutex_lock(&hdmi.lock);
>  
>  	if (hdmi_runtime_get()) {
>  		mutex_unlock(&hdmi.lock);
> -		return;
> +		return 0;
>  	}
>  
>  	hdmi_wp_dump(&hdmi.wp, s);
> @@ -318,6 +318,7 @@ static void hdmi_dump_regs(struct seq_file *s)
>  
>  	hdmi_runtime_put();
>  	mutex_unlock(&hdmi.lock);
> +	return 0;
>  }
>  
>  static int read_edid(u8 *buf, int len)
> @@ -776,7 +777,7 @@ static int hdmi4_bind(struct device *dev, struct device *master, void *data)
>  		return r;
>  	}
>  
> -	dss_debugfs_create_file("hdmi", hdmi_dump_regs);
> +	hdmi.debugfs = dss_debugfs_create_file("hdmi", hdmi_dump_regs, &hdmi);
>  
>  	return 0;
>  err:
> @@ -788,6 +789,8 @@ static void hdmi4_unbind(struct device *dev, struct device *master, void *data)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  
> +	dss_debugfs_remove_file(hdmi.debugfs);
> +
>  	if (hdmi.audio_pdev)
>  		platform_device_unregister(hdmi.audio_pdev);
>  
> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
> index f6c60a6e54ae..00ea975b75f9 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
> @@ -299,13 +299,13 @@ static void hdmi_display_get_timings(struct omap_dss_device *dssdev,
>  	*vm = hdmi.cfg.vm;
>  }
>  
> -static void hdmi_dump_regs(struct seq_file *s)
> +static int hdmi_dump_regs(struct seq_file *s, void *p)
>  {
>  	mutex_lock(&hdmi.lock);
>  
>  	if (hdmi_runtime_get()) {
>  		mutex_unlock(&hdmi.lock);
> -		return;
> +		return 0;
>  	}
>  
>  	hdmi_wp_dump(&hdmi.wp, s);
> @@ -315,6 +315,7 @@ static void hdmi_dump_regs(struct seq_file *s)
>  
>  	hdmi_runtime_put();
>  	mutex_unlock(&hdmi.lock);
> +	return 0;
>  }
>  
>  static int read_edid(u8 *buf, int len)
> @@ -774,7 +775,7 @@ static int hdmi5_bind(struct device *dev, struct device *master, void *data)
>  		return r;
>  	}
>  
> -	dss_debugfs_create_file("hdmi", hdmi_dump_regs);
> +	hdmi.debugfs = dss_debugfs_create_file("hdmi", hdmi_dump_regs, &hdmi);
>  
>  	return 0;
>  err:
> @@ -786,6 +787,8 @@ static void hdmi5_unbind(struct device *dev, struct device *master, void *data)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  
> +	dss_debugfs_remove_file(hdmi.debugfs);
> +
>  	if (hdmi.audio_pdev)
>  		platform_device_unregister(hdmi.audio_pdev);
>  
> diff --git a/drivers/gpu/drm/omapdrm/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
> index 1b0fa952b494..68035c1acf1f 100644
> --- a/drivers/gpu/drm/omapdrm/dss/venc.c
> +++ b/drivers/gpu/drm/omapdrm/dss/venc.c
> @@ -328,6 +328,8 @@ static struct {
>  	u32 wss_data;
>  	struct regulator *vdda_dac_reg;
>  
> +	struct dss_debugfs_entry *debugfs;
> +
>  	struct clk	*tv_dac_clk;
>  
>  	struct videomode vm;
> @@ -671,12 +673,12 @@ static int venc_init_regulator(void)
>  	return 0;
>  }
>  
> -static void venc_dump_regs(struct seq_file *s)
> +static int venc_dump_regs(struct seq_file *s, void *p)
>  {
>  #define DUMPREG(r) seq_printf(s, "%-35s %08x\n", #r, venc_read_reg(r))
>  
>  	if (venc_runtime_get())
> -		return;
> +		return 0;
>  
>  	DUMPREG(VENC_F_CONTROL);
>  	DUMPREG(VENC_VIDOUT_CTRL);
> @@ -723,6 +725,7 @@ static void venc_dump_regs(struct seq_file *s)
>  	venc_runtime_put();
>  
>  #undef DUMPREG
> +	return 0;
>  }
>  
>  static int venc_get_clocks(struct platform_device *pdev)
> @@ -913,7 +916,7 @@ static int venc_bind(struct device *dev, struct device *master, void *data)
>  		goto err_probe_of;
>  	}
>  
> -	dss_debugfs_create_file("venc", venc_dump_regs);
> +	venc.debugfs = dss_debugfs_create_file("venc", venc_dump_regs, &venc);
>  
>  	venc_init_output(pdev);
>  
> @@ -929,6 +932,8 @@ static void venc_unbind(struct device *dev, struct device *master, void *data)
>  {
>  	struct platform_device *pdev = to_platform_device(dev);
>  
> +	dss_debugfs_remove_file(venc.debugfs);
> +
>  	venc_uninit_output(pdev);
>  
>  	pm_runtime_disable(&pdev->dev);
> -- 
> Regards,
> 
> Laurent Pinchart
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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