dvalin/kernel/drivers/gpu/arm/midgard/mali_kbase_regs_history_debugfs.c - manifest_repos/mali-driver - Git at Google

 // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
 /*
  *
  * (C) COPYRIGHT 2014, 2016, 2019-2021 ARM Limited. All rights reserved.
  *
  * This program is free software and is provided to you under the terms of the
  * GNU General Public License version 2 as published by the Free Software
  * Foundation, and any use by you of this program is subject to the terms
  * of such GNU license.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, you can access it online at
  * http://www.gnu.org/licenses/gpl-2.0.html.
  *
  */

 #include "mali_kbase.h"
 #include "mali_kbase_regs_history_debugfs.h"

 /**
  * kbase_io_history_resize - resize the register access history buffer.
  *
  * @h: Pointer to a valid register history to resize
  * @new_size: Number of accesses the buffer could hold
  *
  * A successful resize will clear all recent register accesses.
  * If resizing fails for any reason (e.g., could not allocate memory, invalid
  * buffer size) then the original buffer will be kept intact.
  *
  * @return 0 if the buffer was resized, failure otherwise
  */
 static int kbase_io_history_resize(struct kbase_io_history *h, u16 new_size)
 {
 	struct kbase_io_access *old_buf;
 	struct kbase_io_access *new_buf;
 	unsigned long flags;

 	if (!new_size)
 		goto out_err; /* The new size must not be 0 */

 	new_buf = vmalloc(new_size * sizeof(*h->buf));
 	if (!new_buf)
 		goto out_err;

 	spin_lock_irqsave(&h->lock, flags);

 	old_buf = h->buf;

 	/* Note: we won't bother with copying the old data over. The dumping
 	 * logic wouldn't work properly as it relies on 'count' both as a
 	 * counter and as an index to the buffer which would have changed with
 	 * the new array. This is a corner case that we don't need to support.
 	 */
 	h->count = 0;
 	h->size = new_size;
 	h->buf = new_buf;

 	spin_unlock_irqrestore(&h->lock, flags);

 	vfree(old_buf);

 	return 0;

 out_err:
 	return -1;
 }

 int kbase_io_history_init(struct kbase_io_history *h, u16 n)
 {
 	h->enabled = false;
 	spin_lock_init(&h->lock);
 	h->count = 0;
 	h->size = 0;
 	h->buf = NULL;
 	if (kbase_io_history_resize(h, n))
 		return -1;

 	return 0;
 }

 void kbase_io_history_term(struct kbase_io_history *h)
 {
 	vfree(h->buf);
 	h->buf = NULL;
 }

 void kbase_io_history_add(struct kbase_io_history *h,
 		void __iomem const *addr, u32 value, u8 write)
 {
 	struct kbase_io_access *io;
 	unsigned long flags;

 	spin_lock_irqsave(&h->lock, flags);

 	io = &h->buf[h->count % h->size];
 	io->addr = (uintptr_t)addr | write;
 	io->value = value;
 	++h->count;
 	/* If count overflows, move the index by the buffer size so the entire
 	 * buffer will still be dumped later
 	 */
 	if (unlikely(!h->count))
 		h->count = h->size;

 	spin_unlock_irqrestore(&h->lock, flags);
 }

 void kbase_io_history_dump(struct kbase_device *kbdev)
 {
 	struct kbase_io_history *const h = &kbdev->io_history;
 	size_t i;
 	size_t iters;
 	unsigned long flags;

 	if (!unlikely(h->enabled))
 		return;

 	spin_lock_irqsave(&h->lock, flags);

 	dev_err(kbdev->dev, "Register IO History:");
 	iters = (h->size > h->count) ? h->count : h->size;
 	dev_err(kbdev->dev, "Last %zu register accesses of %zu total:\n", iters,
 			h->count);
 	for (i = 0; i < iters; ++i) {
 		struct kbase_io_access *io =
 			&h->buf[(h->count - iters + i) % h->size];
 		char const access = (io->addr & 1) ? 'w' : 'r';

 		dev_err(kbdev->dev, "%6zu: %c: reg 0x%016lx val %08x\n", i,
 			access, (unsigned long)(io->addr & ~0x1), io->value);
 	}

 	spin_unlock_irqrestore(&h->lock, flags);
 }

 #if defined(CONFIG_DEBUG_FS) && !IS_ENABLED(CONFIG_MALI_NO_MALI)

 #include <linux/debugfs.h>

 static int regs_history_size_get(void *data, u64 *val)
 {
 	struct kbase_io_history *const h = data;

 	*val = h->size;

 	return 0;
 }

 static int regs_history_size_set(void *data, u64 val)
 {
 	struct kbase_io_history *const h = data;

 	return kbase_io_history_resize(h, (u16)val);
 }


 DEFINE_SIMPLE_ATTRIBUTE(regs_history_size_fops,
 		regs_history_size_get,
 		regs_history_size_set,
 		"%llu\n");


 /**
  * regs_history_show - show callback for the register access history file.
  *
  * @sfile: The debugfs entry
  * @data: Data associated with the entry
  *
  * This function is called to dump all recent accesses to the GPU registers.
  *
  * @return 0 if successfully prints data in debugfs entry file, failure
  * otherwise
  */
 static int regs_history_show(struct seq_file *sfile, void *data)
 {
 	struct kbase_io_history *const h = sfile->private;
 	size_t i;
 	size_t iters;
 	unsigned long flags;

 	if (!h->enabled) {
 		seq_puts(sfile, "The register access history is disabled\n");
 		goto out;
 	}

 	spin_lock_irqsave(&h->lock, flags);

 	iters = (h->size > h->count) ? h->count : h->size;
 	seq_printf(sfile, "Last %zu register accesses of %zu total:\n", iters,
 			h->count);
 	for (i = 0; i < iters; ++i) {
 		struct kbase_io_access *io =
 			&h->buf[(h->count - iters + i) % h->size];
 		char const access = (io->addr & 1) ? 'w' : 'r';

 		seq_printf(sfile, "%6zu: %c: reg 0x%016lx val %08x\n", i,
 			   access, (unsigned long)(io->addr & ~0x1), io->value);
 	}

 	spin_unlock_irqrestore(&h->lock, flags);

 out:
 	return 0;
 }

 /**
  * regs_history_open - open operation for regs_history debugfs file
  *
  * @in: &struct inode pointer
  * @file: &struct file pointer
  *
  * @return file descriptor
  */
 static int regs_history_open(struct inode *in, struct file *file)
 {
 	return single_open(file, &regs_history_show, in->i_private);
 }

 static const struct file_operations regs_history_fops = {
 	.owner = THIS_MODULE,
 	.open = &regs_history_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 };

 void kbasep_regs_history_debugfs_init(struct kbase_device *kbdev)
 {
 	debugfs_create_bool("regs_history_enabled", S_IRUGO | S_IWUSR,
 			kbdev->mali_debugfs_directory,
 			&kbdev->io_history.enabled);
 	debugfs_create_file("regs_history_size", S_IRUGO | S_IWUSR,
 			kbdev->mali_debugfs_directory,
 			&kbdev->io_history, &regs_history_size_fops);
 	debugfs_create_file("regs_history", S_IRUGO,
 			kbdev->mali_debugfs_directory, &kbdev->io_history,
 			&regs_history_fops);
 }
 #endif /* defined(CONFIG_DEBUG_FS) && !IS_ENABLED(CONFIG_MALI_NO_MALI) */
	// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
	/*
	*
	* (C) COPYRIGHT 2014, 2016, 2019-2021 ARM Limited. All rights reserved.
	*
	* This program is free software and is provided to you under the terms of the
	* GNU General Public License version 2 as published by the Free Software
	* Foundation, and any use by you of this program is subject to the terms
	* of such GNU license.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, you can access it online at
	* http://www.gnu.org/licenses/gpl-2.0.html.
	*
	*/

	#include "mali_kbase.h"
	#include "mali_kbase_regs_history_debugfs.h"

	/**
	* kbase_io_history_resize - resize the register access history buffer.
	*
	* @h: Pointer to a valid register history to resize
	* @new_size: Number of accesses the buffer could hold
	*
	* A successful resize will clear all recent register accesses.
	* If resizing fails for any reason (e.g., could not allocate memory, invalid
	* buffer size) then the original buffer will be kept intact.
	*
	* @return 0 if the buffer was resized, failure otherwise
	*/
	static int kbase_io_history_resize(struct kbase_io_history *h, u16 new_size)
	{
	struct kbase_io_access *old_buf;
	struct kbase_io_access *new_buf;
	unsigned long flags;

	if (!new_size)
	goto out_err; /* The new size must not be 0 */

	new_buf = vmalloc(new_size * sizeof(*h->buf));
	if (!new_buf)
	goto out_err;

	spin_lock_irqsave(&h->lock, flags);

	old_buf = h->buf;

	/* Note: we won't bother with copying the old data over. The dumping
	* logic wouldn't work properly as it relies on 'count' both as a
	* counter and as an index to the buffer which would have changed with
	* the new array. This is a corner case that we don't need to support.
	*/
	h->count = 0;
	h->size = new_size;
	h->buf = new_buf;

	spin_unlock_irqrestore(&h->lock, flags);

	vfree(old_buf);

	return 0;

	out_err:
	return -1;
	}

	int kbase_io_history_init(struct kbase_io_history *h, u16 n)
	{
	h->enabled = false;
	spin_lock_init(&h->lock);
	h->count = 0;
	h->size = 0;
	h->buf = NULL;
	if (kbase_io_history_resize(h, n))
	return -1;

	return 0;
	}

	void kbase_io_history_term(struct kbase_io_history *h)
	{
	vfree(h->buf);
	h->buf = NULL;
	}

	void kbase_io_history_add(struct kbase_io_history *h,
	void __iomem const *addr, u32 value, u8 write)
	{
	struct kbase_io_access *io;
	unsigned long flags;

	spin_lock_irqsave(&h->lock, flags);

	io = &h->buf[h->count % h->size];
	io->addr = (uintptr_t)addr \| write;
	io->value = value;
	++h->count;
	/* If count overflows, move the index by the buffer size so the entire
	* buffer will still be dumped later
	*/
	if (unlikely(!h->count))
	h->count = h->size;

	spin_unlock_irqrestore(&h->lock, flags);
	}

	void kbase_io_history_dump(struct kbase_device *kbdev)
	{
	struct kbase_io_history *const h = &kbdev->io_history;
	size_t i;
	size_t iters;
	unsigned long flags;

	if (!unlikely(h->enabled))
	return;

	spin_lock_irqsave(&h->lock, flags);

	dev_err(kbdev->dev, "Register IO History:");
	iters = (h->size > h->count) ? h->count : h->size;
	dev_err(kbdev->dev, "Last %zu register accesses of %zu total:\n", iters,
	h->count);
	for (i = 0; i < iters; ++i) {
	struct kbase_io_access *io =
	&h->buf[(h->count - iters + i) % h->size];
	char const access = (io->addr & 1) ? 'w' : 'r';

	dev_err(kbdev->dev, "%6zu: %c: reg 0x%016lx val %08x\n", i,
	access, (unsigned long)(io->addr & ~0x1), io->value);
	}

	spin_unlock_irqrestore(&h->lock, flags);
	}

	#if defined(CONFIG_DEBUG_FS) && !IS_ENABLED(CONFIG_MALI_NO_MALI)

	#include <linux/debugfs.h>

	static int regs_history_size_get(void data, u64 val)
	{
	struct kbase_io_history *const h = data;

	*val = h->size;

	return 0;
	}

	static int regs_history_size_set(void *data, u64 val)
	{
	struct kbase_io_history *const h = data;

	return kbase_io_history_resize(h, (u16)val);
	}


	DEFINE_SIMPLE_ATTRIBUTE(regs_history_size_fops,
	regs_history_size_get,
	regs_history_size_set,
	"%llu\n");


	/**
	* regs_history_show - show callback for the register access history file.
	*
	* @sfile: The debugfs entry
	* @data: Data associated with the entry
	*
	* This function is called to dump all recent accesses to the GPU registers.
	*
	* @return 0 if successfully prints data in debugfs entry file, failure
	* otherwise
	*/
	static int regs_history_show(struct seq_file sfile, void data)
	{
	struct kbase_io_history *const h = sfile->private;
	size_t i;
	size_t iters;
	unsigned long flags;

	if (!h->enabled) {
	seq_puts(sfile, "The register access history is disabled\n");
	goto out;
	}

	spin_lock_irqsave(&h->lock, flags);

	iters = (h->size > h->count) ? h->count : h->size;
	seq_printf(sfile, "Last %zu register accesses of %zu total:\n", iters,
	h->count);
	for (i = 0; i < iters; ++i) {
	struct kbase_io_access *io =
	&h->buf[(h->count - iters + i) % h->size];
	char const access = (io->addr & 1) ? 'w' : 'r';

	seq_printf(sfile, "%6zu: %c: reg 0x%016lx val %08x\n", i,
	access, (unsigned long)(io->addr & ~0x1), io->value);
	}

	spin_unlock_irqrestore(&h->lock, flags);

	out:
	return 0;
	}

	/**
	* regs_history_open - open operation for regs_history debugfs file
	*
	* @in: &struct inode pointer
	* @file: &struct file pointer
	*
	* @return file descriptor
	*/
	static int regs_history_open(struct inode in, struct file file)
	{
	return single_open(file, &regs_history_show, in->i_private);
	}

	static const struct file_operations regs_history_fops = {
	.owner = THIS_MODULE,
	.open = &regs_history_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	void kbasep_regs_history_debugfs_init(struct kbase_device *kbdev)
	{
	debugfs_create_bool("regs_history_enabled", S_IRUGO \| S_IWUSR,
	kbdev->mali_debugfs_directory,
	&kbdev->io_history.enabled);
	debugfs_create_file("regs_history_size", S_IRUGO \| S_IWUSR,
	kbdev->mali_debugfs_directory,
	&kbdev->io_history, &regs_history_size_fops);
	debugfs_create_file("regs_history", S_IRUGO,
	kbdev->mali_debugfs_directory, &kbdev->io_history,
	&regs_history_fops);
	}
	#endif /* defined(CONFIG_DEBUG_FS) && !IS_ENABLED(CONFIG_MALI_NO_MALI) */