bifrost/r38p2/kernel/drivers/gpu/arm/midgard/device/mali_kbase_device_hw.c - manifest_repos/mali-driver - Git at Google

 // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
 /*
  *
  * (C) COPYRIGHT 2014-2016, 2018-2022 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 <gpu/mali_kbase_gpu_fault.h>
 #include <backend/gpu/mali_kbase_instr_internal.h>
 #include <backend/gpu/mali_kbase_pm_internal.h>
 #include <device/mali_kbase_device.h>
 #include <mali_kbase_reset_gpu.h>
 #include <mmu/mali_kbase_mmu.h>

 #define U64_LO_MASK ((1ULL << 32) - 1)
 #define U64_HI_MASK (~U64_LO_MASK)

 #if !IS_ENABLED(CONFIG_MALI_NO_MALI)
 bool kbase_is_gpu_removed(struct kbase_device *kbdev)
 {
 	u32 val;

 	val = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_ID));

 	return val == 0;
 }
 #endif /* !IS_ENABLED(CONFIG_MALI_NO_MALI) */

 static int busy_wait_on_irq(struct kbase_device *kbdev, u32 irq_bit)
 {
 	char *irq_flag_name;
 	/* Previously MMU-AS command was used for L2 cache flush on page-table update.
 	 * And we're using the same max-loops count for GPU command, because amount of
 	 * L2 cache flush overhead are same between them.
 	 */
 	unsigned int max_loops = KBASE_AS_INACTIVE_MAX_LOOPS;

 	/* Wait for the GPU cache clean operation to complete */
 	while (--max_loops &&
 	       !(kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_RAWSTAT)) & irq_bit)) {
 		;
 	}

 	/* reset gpu if time-out occurred */
 	if (max_loops == 0) {
 		switch (irq_bit) {
 		case CLEAN_CACHES_COMPLETED:
 			irq_flag_name = "CLEAN_CACHES_COMPLETED";
 			break;
 		case FLUSH_PA_RANGE_COMPLETED:
 			irq_flag_name = "FLUSH_PA_RANGE_COMPLETED";
 			break;
 		default:
 			irq_flag_name = "UNKNOWN";
 			break;
 		}

 		dev_err(kbdev->dev,
 			"Stuck waiting on %s bit, might be caused by slow/unstable GPU clock or possible faulty FPGA connector\n",
 			irq_flag_name);

 		if (kbase_prepare_to_reset_gpu_locked(kbdev, RESET_FLAGS_NONE))
 			kbase_reset_gpu_locked(kbdev);
 		return -EBUSY;
 	}

 	/* Clear the interrupt bit. */
 	KBASE_KTRACE_ADD(kbdev, CORE_GPU_IRQ_CLEAR, NULL, irq_bit);
 	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR), irq_bit);

 	return 0;
 }

 #define kbase_gpu_cache_flush_pa_range_and_busy_wait(kbdev, phys, nr_bytes, flush_op) (0)

 int kbase_gpu_cache_flush_and_busy_wait(struct kbase_device *kbdev,
 					u32 flush_op)
 {
 	int need_to_wake_up = 0;
 	int ret = 0;

 	/* hwaccess_lock must be held to avoid any sync issue with
 	 * kbase_gpu_start_cache_clean() / kbase_clean_caches_done()
 	 */
 	lockdep_assert_held(&kbdev->hwaccess_lock);

 	/* 1. Check if kbdev->cache_clean_in_progress is set.
 	 *    If it is set, it means there are threads waiting for
 	 *    CLEAN_CACHES_COMPLETED irq to be raised and that the
 	 *    corresponding irq mask bit is set.
 	 *    We'll clear the irq mask bit and busy-wait for the cache
 	 *    clean operation to complete before submitting the cache
 	 *    clean command required after the GPU page table update.
 	 *    Pended flush commands will be merged to requested command.
 	 */
 	if (kbdev->cache_clean_in_progress) {
 		/* disable irq first */
 		u32 irq_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
 		kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK),
 				irq_mask & ~CLEAN_CACHES_COMPLETED);

 		/* busy wait irq status to be enabled */
 		ret = busy_wait_on_irq(kbdev, (u32)CLEAN_CACHES_COMPLETED);
 		if (ret)
 			return ret;

 		/* merge pended command if there's any */
 		flush_op = GPU_COMMAND_FLUSH_CACHE_MERGE(
 			kbdev->cache_clean_queued, flush_op);

 		/* enable wake up notify flag */
 		need_to_wake_up = 1;
 	} else {
 		/* Clear the interrupt CLEAN_CACHES_COMPLETED bit. */
 		kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR),
 				CLEAN_CACHES_COMPLETED);
 	}

 	/* 2. Issue GPU_CONTROL.COMMAND.FLUSH_CACHE operation. */
 	KBASE_KTRACE_ADD(kbdev, CORE_GPU_CLEAN_INV_CACHES, NULL, flush_op);
 	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_COMMAND), flush_op);

 	/* 3. Busy-wait irq status to be enabled. */
 	ret = busy_wait_on_irq(kbdev, (u32)CLEAN_CACHES_COMPLETED);
 	if (ret)
 		return ret;

 	/* 4. Wake-up blocked threads when there is any. */
 	if (need_to_wake_up)
 		kbase_gpu_cache_clean_wait_complete(kbdev);

 	return ret;
 }

 void kbase_gpu_start_cache_clean_nolock(struct kbase_device *kbdev,
 					u32 flush_op)
 {
 	u32 irq_mask;

 	lockdep_assert_held(&kbdev->hwaccess_lock);

 	if (kbdev->cache_clean_in_progress) {
 		/* If this is called while another clean is in progress, we
 		 * can't rely on the current one to flush any new changes in
 		 * the cache. Instead, accumulate all cache clean operations
 		 * and trigger that immediately after this one finishes.
 		 */
 		kbdev->cache_clean_queued = GPU_COMMAND_FLUSH_CACHE_MERGE(
 			kbdev->cache_clean_queued, flush_op);
 		return;
 	}

 	/* Enable interrupt */
 	irq_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
 	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK),
 				irq_mask | CLEAN_CACHES_COMPLETED);

 	KBASE_KTRACE_ADD(kbdev, CORE_GPU_CLEAN_INV_CACHES, NULL, flush_op);
 	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_COMMAND), flush_op);

 	kbdev->cache_clean_in_progress = true;
 }

 void kbase_gpu_start_cache_clean(struct kbase_device *kbdev, u32 flush_op)
 {
 	unsigned long flags;

 	spin_lock_irqsave(&kbdev->hwaccess_lock, flags);
 	kbase_gpu_start_cache_clean_nolock(kbdev, flush_op);
 	spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);
 }

 void kbase_gpu_cache_clean_wait_complete(struct kbase_device *kbdev)
 {
 	lockdep_assert_held(&kbdev->hwaccess_lock);

 	kbdev->cache_clean_queued = 0;
 	kbdev->cache_clean_in_progress = false;
 	wake_up(&kbdev->cache_clean_wait);
 }

 void kbase_clean_caches_done(struct kbase_device *kbdev)
 {
 	u32 irq_mask;
 	unsigned long flags;

 	spin_lock_irqsave(&kbdev->hwaccess_lock, flags);

 	if (kbdev->cache_clean_in_progress) {
 		/* Clear the interrupt CLEAN_CACHES_COMPLETED bit if set.
 		 * It might have already been done by kbase_gpu_cache_flush_and_busy_wait.
 		 */
 		KBASE_KTRACE_ADD(kbdev, CORE_GPU_IRQ_CLEAR, NULL, CLEAN_CACHES_COMPLETED);
 		kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR), CLEAN_CACHES_COMPLETED);

 		if (kbdev->cache_clean_queued) {
 			u32 pended_flush_op = kbdev->cache_clean_queued;

 			kbdev->cache_clean_queued = 0;

 			KBASE_KTRACE_ADD(kbdev, CORE_GPU_CLEAN_INV_CACHES, NULL, pended_flush_op);
 			kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_COMMAND), pended_flush_op);
 		} else {
 			/* Disable interrupt */
 			irq_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
 			kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK),
 					irq_mask & ~CLEAN_CACHES_COMPLETED);

 			kbase_gpu_cache_clean_wait_complete(kbdev);
 		}
 	}

 	spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);
 }

 static inline bool get_cache_clean_flag(struct kbase_device *kbdev)
 {
 	bool cache_clean_in_progress;
 	unsigned long flags;

 	spin_lock_irqsave(&kbdev->hwaccess_lock, flags);
 	cache_clean_in_progress = kbdev->cache_clean_in_progress;
 	spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);

 	return cache_clean_in_progress;
 }

 void kbase_gpu_wait_cache_clean(struct kbase_device *kbdev)
 {
 	while (get_cache_clean_flag(kbdev)) {
 		wait_event_interruptible(kbdev->cache_clean_wait,
 				!kbdev->cache_clean_in_progress);
 	}
 }

 int kbase_gpu_wait_cache_clean_timeout(struct kbase_device *kbdev,
 				unsigned int wait_timeout_ms)
 {
 	long remaining = msecs_to_jiffies(wait_timeout_ms);

 	while (remaining && get_cache_clean_flag(kbdev)) {
 		remaining = wait_event_timeout(kbdev->cache_clean_wait,
 					!kbdev->cache_clean_in_progress,
 					remaining);
 	}

 	return (remaining ? 0 : -ETIMEDOUT);
 }
	// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
	/*
	*
	* (C) COPYRIGHT 2014-2016, 2018-2022 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 <gpu/mali_kbase_gpu_fault.h>
	#include <backend/gpu/mali_kbase_instr_internal.h>
	#include <backend/gpu/mali_kbase_pm_internal.h>
	#include <device/mali_kbase_device.h>
	#include <mali_kbase_reset_gpu.h>
	#include <mmu/mali_kbase_mmu.h>

	#define U64_LO_MASK ((1ULL << 32) - 1)
	#define U64_HI_MASK (~U64_LO_MASK)

	#if !IS_ENABLED(CONFIG_MALI_NO_MALI)
	bool kbase_is_gpu_removed(struct kbase_device *kbdev)
	{
	u32 val;

	val = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_ID));

	return val == 0;
	}
	#endif /* !IS_ENABLED(CONFIG_MALI_NO_MALI) */

	static int busy_wait_on_irq(struct kbase_device *kbdev, u32 irq_bit)
	{
	char *irq_flag_name;
	/* Previously MMU-AS command was used for L2 cache flush on page-table update.
	* And we're using the same max-loops count for GPU command, because amount of
	* L2 cache flush overhead are same between them.
	*/
	unsigned int max_loops = KBASE_AS_INACTIVE_MAX_LOOPS;

	/* Wait for the GPU cache clean operation to complete */
	while (--max_loops &&
	!(kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_RAWSTAT)) & irq_bit)) {
	;
	}

	/* reset gpu if time-out occurred */
	if (max_loops == 0) {
	switch (irq_bit) {
	case CLEAN_CACHES_COMPLETED:
	irq_flag_name = "CLEAN_CACHES_COMPLETED";
	break;
	case FLUSH_PA_RANGE_COMPLETED:
	irq_flag_name = "FLUSH_PA_RANGE_COMPLETED";
	break;
	default:
	irq_flag_name = "UNKNOWN";
	break;
	}

	dev_err(kbdev->dev,
	"Stuck waiting on %s bit, might be caused by slow/unstable GPU clock or possible faulty FPGA connector\n",
	irq_flag_name);

	if (kbase_prepare_to_reset_gpu_locked(kbdev, RESET_FLAGS_NONE))
	kbase_reset_gpu_locked(kbdev);
	return -EBUSY;
	}

	/* Clear the interrupt bit. */
	KBASE_KTRACE_ADD(kbdev, CORE_GPU_IRQ_CLEAR, NULL, irq_bit);
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR), irq_bit);

	return 0;
	}

	#define kbase_gpu_cache_flush_pa_range_and_busy_wait(kbdev, phys, nr_bytes, flush_op) (0)

	int kbase_gpu_cache_flush_and_busy_wait(struct kbase_device *kbdev,
	u32 flush_op)
	{
	int need_to_wake_up = 0;
	int ret = 0;

	/* hwaccess_lock must be held to avoid any sync issue with
	* kbase_gpu_start_cache_clean() / kbase_clean_caches_done()
	*/
	lockdep_assert_held(&kbdev->hwaccess_lock);

	/* 1. Check if kbdev->cache_clean_in_progress is set.
	* If it is set, it means there are threads waiting for
	* CLEAN_CACHES_COMPLETED irq to be raised and that the
	* corresponding irq mask bit is set.
	* We'll clear the irq mask bit and busy-wait for the cache
	* clean operation to complete before submitting the cache
	* clean command required after the GPU page table update.
	* Pended flush commands will be merged to requested command.
	*/
	if (kbdev->cache_clean_in_progress) {
	/* disable irq first */
	u32 irq_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK),
	irq_mask & ~CLEAN_CACHES_COMPLETED);

	/* busy wait irq status to be enabled */
	ret = busy_wait_on_irq(kbdev, (u32)CLEAN_CACHES_COMPLETED);
	if (ret)
	return ret;

	/* merge pended command if there's any */
	flush_op = GPU_COMMAND_FLUSH_CACHE_MERGE(
	kbdev->cache_clean_queued, flush_op);

	/* enable wake up notify flag */
	need_to_wake_up = 1;
	} else {
	/* Clear the interrupt CLEAN_CACHES_COMPLETED bit. */
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR),
	CLEAN_CACHES_COMPLETED);
	}

	/* 2. Issue GPU_CONTROL.COMMAND.FLUSH_CACHE operation. */
	KBASE_KTRACE_ADD(kbdev, CORE_GPU_CLEAN_INV_CACHES, NULL, flush_op);
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_COMMAND), flush_op);

	/* 3. Busy-wait irq status to be enabled. */
	ret = busy_wait_on_irq(kbdev, (u32)CLEAN_CACHES_COMPLETED);
	if (ret)
	return ret;

	/* 4. Wake-up blocked threads when there is any. */
	if (need_to_wake_up)
	kbase_gpu_cache_clean_wait_complete(kbdev);

	return ret;
	}

	void kbase_gpu_start_cache_clean_nolock(struct kbase_device *kbdev,
	u32 flush_op)
	{
	u32 irq_mask;

	lockdep_assert_held(&kbdev->hwaccess_lock);

	if (kbdev->cache_clean_in_progress) {
	/* If this is called while another clean is in progress, we
	* can't rely on the current one to flush any new changes in
	* the cache. Instead, accumulate all cache clean operations
	* and trigger that immediately after this one finishes.
	*/
	kbdev->cache_clean_queued = GPU_COMMAND_FLUSH_CACHE_MERGE(
	kbdev->cache_clean_queued, flush_op);
	return;
	}

	/* Enable interrupt */
	irq_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK),
	irq_mask \| CLEAN_CACHES_COMPLETED);

	KBASE_KTRACE_ADD(kbdev, CORE_GPU_CLEAN_INV_CACHES, NULL, flush_op);
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_COMMAND), flush_op);

	kbdev->cache_clean_in_progress = true;
	}

	void kbase_gpu_start_cache_clean(struct kbase_device *kbdev, u32 flush_op)
	{
	unsigned long flags;

	spin_lock_irqsave(&kbdev->hwaccess_lock, flags);
	kbase_gpu_start_cache_clean_nolock(kbdev, flush_op);
	spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);
	}

	void kbase_gpu_cache_clean_wait_complete(struct kbase_device *kbdev)
	{
	lockdep_assert_held(&kbdev->hwaccess_lock);

	kbdev->cache_clean_queued = 0;
	kbdev->cache_clean_in_progress = false;
	wake_up(&kbdev->cache_clean_wait);
	}

	void kbase_clean_caches_done(struct kbase_device *kbdev)
	{
	u32 irq_mask;
	unsigned long flags;

	spin_lock_irqsave(&kbdev->hwaccess_lock, flags);

	if (kbdev->cache_clean_in_progress) {
	/* Clear the interrupt CLEAN_CACHES_COMPLETED bit if set.
	* It might have already been done by kbase_gpu_cache_flush_and_busy_wait.
	*/
	KBASE_KTRACE_ADD(kbdev, CORE_GPU_IRQ_CLEAR, NULL, CLEAN_CACHES_COMPLETED);
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_CLEAR), CLEAN_CACHES_COMPLETED);

	if (kbdev->cache_clean_queued) {
	u32 pended_flush_op = kbdev->cache_clean_queued;

	kbdev->cache_clean_queued = 0;

	KBASE_KTRACE_ADD(kbdev, CORE_GPU_CLEAN_INV_CACHES, NULL, pended_flush_op);
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_COMMAND), pended_flush_op);
	} else {
	/* Disable interrupt */
	irq_mask = kbase_reg_read(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK));
	kbase_reg_write(kbdev, GPU_CONTROL_REG(GPU_IRQ_MASK),
	irq_mask & ~CLEAN_CACHES_COMPLETED);

	kbase_gpu_cache_clean_wait_complete(kbdev);
	}
	}

	spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);
	}

	static inline bool get_cache_clean_flag(struct kbase_device *kbdev)
	{
	bool cache_clean_in_progress;
	unsigned long flags;

	spin_lock_irqsave(&kbdev->hwaccess_lock, flags);
	cache_clean_in_progress = kbdev->cache_clean_in_progress;
	spin_unlock_irqrestore(&kbdev->hwaccess_lock, flags);

	return cache_clean_in_progress;
	}

	void kbase_gpu_wait_cache_clean(struct kbase_device *kbdev)
	{
	while (get_cache_clean_flag(kbdev)) {
	wait_event_interruptible(kbdev->cache_clean_wait,
	!kbdev->cache_clean_in_progress);
	}
	}

	int kbase_gpu_wait_cache_clean_timeout(struct kbase_device *kbdev,
	unsigned int wait_timeout_ms)
	{
	long remaining = msecs_to_jiffies(wait_timeout_ms);

	while (remaining && get_cache_clean_flag(kbdev)) {
	remaining = wait_event_timeout(kbdev->cache_clean_wait,
	!kbdev->cache_clean_in_progress,
	remaining);
	}

	return (remaining ? 0 : -ETIMEDOUT);
	}