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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/memory_group_manager.h
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@@ -1,7 +1,7 @@
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 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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 /*
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  *
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- * (C) COPYRIGHT 2019-2021 ARM Limited. All rights reserved.
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+ * (C) COPYRIGHT 2019-2022 ARM Limited. All rights reserved.
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  *
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  * This program is free software and is provided to you under the terms of the
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  * GNU General Public License version 2 as published by the Free Software
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@@ -43,10 +43,12 @@
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  * @mgm_free_page:            Callback to free physical memory in a group
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  * @mgm_get_import_memory_id: Callback to get the group ID for imported memory
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  * @mgm_update_gpu_pte:       Callback to modify a GPU page table entry
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+ * @mgm_pte_to_original_pte:  Callback to get the original PTE entry as given
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+ *                            to mgm_update_gpu_pte
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  * @mgm_vmf_insert_pfn_prot:  Callback to map a physical memory page for the CPU
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  */
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 struct memory_group_manager_ops {
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-	/**
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+	/*
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 	 * mgm_alloc_page - Allocate a physical memory page in a group
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 	 *
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 	 * @mgm_dev:  The memory group manager through which the request is
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@@ -65,7 +67,7 @@
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 		struct memory_group_manager_device *mgm_dev, int group_id,
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 		gfp_t gfp_mask, unsigned int order);
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-	/**
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+	/*
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 	 * mgm_free_page - Free a physical memory page in a group
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 	 *
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 	 * @mgm_dev:  The memory group manager through which the request
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@@ -84,7 +86,7 @@
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 		struct memory_group_manager_device *mgm_dev, int group_id,
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 		struct page *page, unsigned int order);
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-	/**
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+	/*
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 	 * mgm_get_import_memory_id - Get the physical memory group ID for the
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 	 *                            imported memory
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 	 *
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@@ -103,7 +105,7 @@
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 		struct memory_group_manager_device *mgm_dev,
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 		struct memory_group_manager_import_data *import_data);
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-	/**
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+	/*
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 	 * mgm_update_gpu_pte - Modify a GPU page table entry for a memory group
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 	 *
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 	 * @mgm_dev:   The memory group manager through which the request
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@@ -120,14 +122,36 @@
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 	 * This function allows the memory group manager to modify a GPU page
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 	 * table entry before it is stored by the kbase module (controller
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 	 * driver). It may set certain bits in the page table entry attributes
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-	 * or in the physical address, based on the physical memory group ID.
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+	 * or modify the physical address, based on the physical memory group ID
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+	 * and/or additional data in struct memory_group_manager_device.
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 	 *
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 	 * Return: A modified GPU page table entry to be stored in a page table.
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 	 */
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 	u64 (*mgm_update_gpu_pte)(struct memory_group_manager_device *mgm_dev,
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 			int group_id, int mmu_level, u64 pte);
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-	/**
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+	/*
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+	 * mgm_pte_to_original_pte - Undo any modification done during mgm_update_gpu_pte()
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+	 *
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+	 * @mgm_dev:   The memory group manager through which the request
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+	 *             is being made.
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+	 * @group_id:  A physical memory group ID. The meaning of this is
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+	 *             defined by the systems integrator. Its valid range is
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+	 *             0 .. MEMORY_GROUP_MANAGER_NR_GROUPS-1.
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+	 * @mmu_level: The level of the page table entry in @ate.
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+	 * @pte:       The page table entry to restore the original representation for,
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+	 *             in LPAE or AArch64 format (depending on the driver's configuration).
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+	 *
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+	 * Undo any modifications done during mgm_update_gpu_pte().
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+	 * This function allows getting back the original PTE entry as given
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+	 * to mgm_update_gpu_pte().
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+	 *
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+	 * Return: PTE entry as originally specified to mgm_update_gpu_pte()
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+	 */
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+	u64 (*mgm_pte_to_original_pte)(struct memory_group_manager_device *mgm_dev, int group_id,
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+				       int mmu_level, u64 pte);
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+
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+	/*
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 	 * mgm_vmf_insert_pfn_prot - Map a physical page in a group for the CPU
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 	 *
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 	 * @mgm_dev:   The memory group manager through which the request
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@@ -158,8 +182,9 @@
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  * struct memory_group_manager_device - Device structure for a memory group
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  *                                      manager
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  *
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- * @ops  - Callbacks associated with this device
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- * @data - Pointer to device private data
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+ * @ops:   Callbacks associated with this device
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+ * @data:  Pointer to device private data
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+ * @owner: pointer to owning module
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  *
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  * In order for a systems integrator to provide custom behaviors for memory
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  * operations performed by the kbase module (controller driver), they must
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@@ -183,8 +208,9 @@
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  * struct memory_group_manager_import_data - Structure describing the imported
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  *                                           memory
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  *
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- * @type  - type of imported memory
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- * @u     - Union describing the imported memory
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+ * @type:      type of imported memory
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+ * @u:         Union describing the imported memory
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+ * @u.dma_buf: imported memory
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  *
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  */
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 struct memory_group_manager_import_data {