drm/panfrost: show device-wide list of DRM GEM objects over DebugFS (e48ade5e) · Commits · git / linux-net

drivers/gpu/drm/panfrost/panfrost_device.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -209,6 +209,11 @@ int panfrost_device_init(struct panfrost_device *pfdev)

		spin_lock_init(&pfdev->cycle_counter.lock);

		#ifdef CONFIG_DEBUG_FS
		mutex_init(&pfdev->debugfs.gems_lock);
		INIT_LIST_HEAD(&pfdev->debugfs.gems_list);
		#endif

		err = panfrost_pm_domain_init(pfdev);
		if (err)
		return err;

drivers/gpu/drm/panfrost/panfrost_device.h

+15 −0

Original line number	Diff line number	Diff line
		@@ -111,6 +111,17 @@ struct panfrost_compatible {
		u8 gpu_quirks;
		};

		/**
		* struct panfrost_device_debugfs - Device-wide DebugFS tracking structures
		*/
		struct panfrost_device_debugfs {
		/** @gems_list: Device-wide list of GEM objects owned by at least one file. */
		struct list_head gems_list;

		/** @gems_lock: Serializes access to the device-wide list of GEM objects. */
		struct mutex gems_lock;
		};

		struct panfrost_device {
		struct device *dev;
		struct drm_device *ddev;
		@@ -164,6 +175,10 @@ struct panfrost_device {
		atomic_t use_count;
		spinlock_t lock;
		} cycle_counter;

		#ifdef CONFIG_DEBUG_FS
		struct panfrost_device_debugfs debugfs;
		#endif
		};

		struct panfrost_mmu {

drivers/gpu/drm/panfrost/panfrost_drv.c

+35 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@
		#include <linux/platform_device.h>
		#include <linux/pm_runtime.h>
		#include <drm/panfrost_drm.h>
		#include <drm/drm_debugfs.h>
		#include <drm/drm_drv.h>
		#include <drm/drm_ioctl.h>
		#include <drm/drm_syncobj.h>
		@@ -659,6 +660,37 @@ static const struct file_operations panfrost_drm_driver_fops = {
		.show_fdinfo = drm_show_fdinfo,
		};

		#ifdef CONFIG_DEBUG_FS
		static int panthor_gems_show(struct seq_file m, void data)
		{
		struct drm_info_node *node = m->private;
		struct drm_device *dev = node->minor->dev;
		struct panfrost_device *pfdev = dev->dev_private;

		panfrost_gem_debugfs_print_bos(pfdev, m);

		return 0;
		}

		static struct drm_info_list panthor_debugfs_list[] = {
		{"gems", panthor_gems_show, 0, NULL},
		};

		static int panthor_gems_debugfs_init(struct drm_minor *minor)
		{
		drm_debugfs_create_files(panthor_debugfs_list,
		ARRAY_SIZE(panthor_debugfs_list),
		minor->debugfs_root, minor);

		return 0;
		}

		static void panfrost_debugfs_init(struct drm_minor *minor)
		{
		panthor_gems_debugfs_init(minor);
		}
		#endif

		/*
		* Panfrost driver version:
		* - 1.0 - initial interface
		@@ -683,6 +715,9 @@ static const struct drm_driver panfrost_drm_driver = {

		.gem_create_object = panfrost_gem_create_object,
		.gem_prime_import_sg_table = panfrost_gem_prime_import_sg_table,
		#ifdef CONFIG_DEBUG_FS
		.debugfs_init = panfrost_debugfs_init,
		#endif
		};

		static int panfrost_probe(struct platform_device *pdev)

drivers/gpu/drm/panfrost/panfrost_gem.c

+134 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,36 @@
		#include "panfrost_gem.h"
		#include "panfrost_mmu.h"

		#ifdef CONFIG_DEBUG_FS
		static void panfrost_gem_debugfs_bo_add(struct panfrost_device *pfdev,
		struct panfrost_gem_object *bo)
		{
		bo->debugfs.creator.tgid = current->group_leader->pid;
		get_task_comm(bo->debugfs.creator.process_name, current->group_leader);

		mutex_lock(&pfdev->debugfs.gems_lock);
		list_add_tail(&bo->debugfs.node, &pfdev->debugfs.gems_list);
		mutex_unlock(&pfdev->debugfs.gems_lock);
		}

		static void panfrost_gem_debugfs_bo_rm(struct panfrost_gem_object *bo)
		{
		struct panfrost_device *pfdev = bo->base.base.dev->dev_private;

		if (list_empty(&bo->debugfs.node))
		return;

		mutex_lock(&pfdev->debugfs.gems_lock);
		list_del_init(&bo->debugfs.node);
		mutex_unlock(&pfdev->debugfs.gems_lock);
		}
		#else
		static void panfrost_gem_debugfs_bo_add(struct panfrost_device *pfdev,
		struct panfrost_gem_object *bo)
		{}
		static void panfrost_gem_debugfs_bo_rm(struct panfrost_gem_object *bo) {}
		#endif

		/* Called DRM core on the last userspace/kernel unreference of the
		* BO.
		*/
		@@ -37,6 +67,7 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj)
		WARN_ON_ONCE(!list_empty(&bo->mappings.list));

		kfree_const(bo->label.str);
		panfrost_gem_debugfs_bo_rm(bo);
		mutex_destroy(&bo->label.lock);

		if (bo->sgts) {
		@@ -266,6 +297,8 @@ struct drm_gem_object panfrost_gem_create_object(struct drm_device dev, size_t
		obj->base.map_wc = !pfdev->coherent;
		mutex_init(&obj->label.lock);

		panfrost_gem_debugfs_bo_add(pfdev, obj);

		return &obj->base.base;
		}

		@@ -354,3 +387,104 @@ panfrost_gem_internal_set_label(struct drm_gem_object obj, const char label)

		panfrost_gem_set_label(obj, str);
		}

		#ifdef CONFIG_DEBUG_FS
		struct gem_size_totals {
		size_t size;
		size_t resident;
		size_t reclaimable;
		};

		struct flag_def {
		u32 flag;
		const char *name;
		};

		static void panfrost_gem_debugfs_print_flag_names(struct seq_file *m)
		{
		int len;
		int i;

		static const struct flag_def gem_state_flags_names[] = {
		{PANFROST_DEBUGFS_GEM_STATE_FLAG_IMPORTED, "imported"},
		{PANFROST_DEBUGFS_GEM_STATE_FLAG_EXPORTED, "exported"},
		{PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGED, "purged"},
		{PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGEABLE, "purgeable"},
		};

		seq_puts(m, "GEM state flags: ");
		for (i = 0, len = ARRAY_SIZE(gem_state_flags_names); i < len; i++) {
		seq_printf(m, "%s (0x%x)%s", gem_state_flags_names[i].name,
		gem_state_flags_names[i].flag, (i < len - 1) ? ", " : "\n\n");
		}
		}

		static void panfrost_gem_debugfs_bo_print(struct panfrost_gem_object *bo,
		struct seq_file *m,
		struct gem_size_totals *totals)
		{
		unsigned int refcount = kref_read(&bo->base.base.refcount);
		char creator_info[32] = {};
		size_t resident_size;
		u32 gem_state_flags = 0;

		/* Skip BOs being destroyed. */
		if (!refcount)
		return;

		resident_size = bo->base.pages ? bo->base.base.size : 0;

		snprintf(creator_info, sizeof(creator_info),
		"%s/%d", bo->debugfs.creator.process_name, bo->debugfs.creator.tgid);
		seq_printf(m, "%-32s%-16d%-16d%-16zd%-16zd0x%-16lx",
		creator_info,
		bo->base.base.name,
		refcount,
		bo->base.base.size,
		resident_size,
		drm_vma_node_start(&bo->base.base.vma_node));

		if (bo->base.base.import_attach)
		gem_state_flags \|= PANFROST_DEBUGFS_GEM_STATE_FLAG_IMPORTED;
		if (bo->base.base.dma_buf)
		gem_state_flags \|= PANFROST_DEBUGFS_GEM_STATE_FLAG_EXPORTED;

		if (bo->base.madv < 0)
		gem_state_flags \|= PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGED;
		else if (bo->base.madv > 0)
		gem_state_flags \|= PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGEABLE;

		seq_printf(m, "0x%-10x", gem_state_flags);

		scoped_guard(mutex, &bo->label.lock) {
		seq_printf(m, "%s\n", bo->label.str ? : "");
		}

		totals->size += bo->base.base.size;
		totals->resident += resident_size;
		if (bo->base.madv > 0)
		totals->reclaimable += resident_size;
		}

		void panfrost_gem_debugfs_print_bos(struct panfrost_device *pfdev,
		struct seq_file *m)
		{
		struct gem_size_totals totals = {0};
		struct panfrost_gem_object *bo;

		panfrost_gem_debugfs_print_flag_names(m);

		seq_puts(m, "created-by global-name refcount size resident-size file-offset state label\n");
		seq_puts(m, "-----------------------------------------------------------------------------------------------------------------------------------\n");

		scoped_guard(mutex, &pfdev->debugfs.gems_lock) {
		list_for_each_entry(bo, &pfdev->debugfs.gems_list, debugfs.node) {
		panfrost_gem_debugfs_bo_print(bo, m, &totals);
		}
		}

		seq_puts(m, "===================================================================================================================================\n");
		seq_printf(m, "Total size: %zd, Total resident: %zd, Total reclaimable: %zd\n",
		totals.size, totals.resident, totals.reclaimable);
		}
		#endif

drivers/gpu/drm/panfrost/panfrost_gem.h

+47 −0

Original line number	Diff line number	Diff line
		@@ -8,9 +8,47 @@
		#include <drm/drm_mm.h>

		struct panfrost_mmu;
		struct panfrost_device;

		#define PANFROST_BO_LABEL_MAXLEN 4096

		enum panfrost_debugfs_gem_state_flags {
		/** @PANFROST_DEBUGFS_GEM_STATE_FLAG_IMPORTED: GEM BO is PRIME imported. */
		PANFROST_DEBUGFS_GEM_STATE_FLAG_IMPORTED = BIT(0),

		/** @PANFROST_DEBUGFS_GEM_STATE_FLAG_EXPORTED: GEM BO is PRIME exported. */
		PANFROST_DEBUGFS_GEM_STATE_FLAG_EXPORTED = BIT(1),

		/** @PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGED: GEM BO was reclaimed by the shrinker. */
		PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGED = BIT(2),

		/**
		* @PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGEABLE: GEM BO pages were marked as no longer
		* needed by UM and can be reclaimed by the shrinker.
		*/
		PANFROST_DEBUGFS_GEM_STATE_FLAG_PURGEABLE = BIT(3),
		};

		/**
		* struct panfrost_gem_debugfs - GEM object's DebugFS list information
		*/
		struct panfrost_gem_debugfs {
		/**
		* @node: Node used to insert the object in the device-wide list of
		* GEM objects, to display information about it through a DebugFS file.
		*/
		struct list_head node;

		/** @creator: Information about the UM process which created the GEM. */
		struct {
		/** @creator.process_name: Group leader name in owning thread's process */
		char process_name[TASK_COMM_LEN];

		/** @creator.tgid: PID of the thread's group leader within its process */
		pid_t tgid;
		} creator;
		};

		struct panfrost_gem_object {
		struct drm_gem_shmem_object base;
		struct sg_table *sgts;
		@@ -59,6 +97,10 @@ struct panfrost_gem_object {

		bool noexec :1;
		bool is_heap :1;

		#ifdef CONFIG_DEBUG_FS
		struct panfrost_gem_debugfs debugfs;
		#endif
		};

		struct panfrost_gem_mapping {
		@@ -108,4 +150,9 @@ void panfrost_gem_shrinker_cleanup(struct drm_device *dev);
		void panfrost_gem_set_label(struct drm_gem_object obj, const char label);
		void panfrost_gem_internal_set_label(struct drm_gem_object obj, const char label);

		#ifdef CONFIG_DEBUG_FS
		void panfrost_gem_debugfs_print_bos(struct panfrost_device *pfdev,
		struct seq_file *m);
		#endif

		#endif /* __PANFROST_GEM_H__ */