linux-kernel - [PATCH v3 4/9] riscv: mm: Refactor create_linear_mapping

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Date: Tue, 21 May 2024 13:48:25 +0200
From: Björn Töpel <bjorn@...nel.org>
To: Alexandre Ghiti <alexghiti@...osinc.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	David Hildenbrand <david@...hat.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	linux-riscv@...ts.infradead.org,
	Oscar Salvador <osalvador@...e.de>
Cc: Björn Töpel <bjorn@...osinc.com>,
	Andrew Bresticker <abrestic@...osinc.com>,
	Chethan Seshadri <Chethan.Seshadri@...alinasystems.io>,
	Lorenzo Stoakes <lstoakes@...il.com>,
	Santosh Mamila <santosh.mamila@...alinasystems.io>,
	Sivakumar Munnangi <siva.munnangi@...alinasystems.io>,
	Sunil V L <sunilvl@...tanamicro.com>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH v3 4/9] riscv: mm: Refactor create_linear_mapping_range() for memory hot add

From: Björn Töpel <bjorn@...osinc.com>

Add a parameter to the direct map setup function, so it can be used in
arch_add_memory() later.

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Oscar Salvador <osalvador@...e.de>
Signed-off-by: Björn Töpel <bjorn@...osinc.com>
---
 arch/riscv/mm/init.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index c969427eab88..6f72b0b2b854 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1227,7 +1227,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 }
 
 static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
-						  uintptr_t fixed_map_size)
+						  uintptr_t fixed_map_size, const pgprot_t *pgprot)
 {
 	phys_addr_t pa;
 	uintptr_t va, map_size;
@@ -1238,7 +1238,7 @@ static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t
 					    best_map_size(pa, va, end - pa);
 
 		create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
-				   pgprot_from_va(va));
+				   pgprot ? *pgprot : pgprot_from_va(va));
 	}
 }
 
@@ -1282,22 +1282,19 @@ static void __init create_linear_mapping_page_table(void)
 		if (end >= __pa(PAGE_OFFSET) + memory_limit)
 			end = __pa(PAGE_OFFSET) + memory_limit;
 
-		create_linear_mapping_range(start, end, 0);
+		create_linear_mapping_range(start, end, 0, NULL);
 	}
 
 #ifdef CONFIG_STRICT_KERNEL_RWX
-	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0);
-	create_linear_mapping_range(krodata_start,
-				    krodata_start + krodata_size, 0);
+	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL);
+	create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL);
 
 	memblock_clear_nomap(ktext_start,  ktext_size);
 	memblock_clear_nomap(krodata_start, krodata_size);
 #endif
 
 #ifdef CONFIG_KFENCE
-	create_linear_mapping_range(kfence_pool,
-				    kfence_pool + KFENCE_POOL_SIZE,
-				    PAGE_SIZE);
+	create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL);
 
 	memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
 #endif
-- 
2.40.1