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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/gpu/arm/bifrost/mali_kbase_mem_lowlevel.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 2012-2014, 2016-2018, 2020-2021 ARM Limited. All rights reserved.
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+ * (C) COPYRIGHT 2012-2014, 2016-2018, 2020-2022 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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@@ -47,6 +47,8 @@
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 #define HUGE_PAGE    (1u << 0)
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 #define HUGE_HEAD    (1u << 1)
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 #define FROM_PARTIAL (1u << 2)
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+
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+#define NUM_4K_PAGES_IN_2MB_PAGE (SZ_2M / SZ_4K)
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 /*
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  * Note: if macro for converting physical address to page is not defined
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@@ -158,4 +160,20 @@
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 	return t.tagged_addr & FROM_PARTIAL;
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 }
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+/**
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+ * index_in_large_page() - Get index of a 4KB page within a 2MB page which
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+ *                         wasn't split to be used partially.
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+ *
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+ * @t:  Tagged physical address of the physical 4KB page that lies within
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+ *      the large (or 2 MB) physical page.
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+ *
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+ * Return: Index of the 4KB page within a 2MB page
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+ */
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+static inline unsigned int index_in_large_page(struct tagged_addr t)
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+{
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+	WARN_ON(!is_huge(t));
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+
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+	return (PFN_DOWN(as_phys_addr_t(t)) & (NUM_4K_PAGES_IN_2MB_PAGE - 1));
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+}
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+
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 #endif /* _KBASE_LOWLEVEL_H */