linux-kernel - [PATCH 3/7] riscv: mm: Refactor create_linear_mapping

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Message-Id: <20230512145737.985671-4-bjorn@kernel.org>
Date:   Fri, 12 May 2023 16:57:33 +0200
From:   Björn Töpel <bjorn@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org
Cc:     Björn Töpel <bjorn@...osinc.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        virtualization@...ts.linux-foundation.org, linux@...osinc.com,
        Alexandre Ghiti <alexghiti@...osinc.com>
Subject: [PATCH 3/7] riscv: mm: Refactor create_linear_mapping_range() for 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.

Signed-off-by: Björn Töpel <bjorn@...osinc.com>
---
 arch/riscv/mm/init.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index e974ff6ef036..aea8ccb3f4ae 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -1247,18 +1247,19 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 	pt_ops_set_fixmap();
 }
 
-static void __init create_linear_mapping_range(phys_addr_t start,
-					       phys_addr_t end)
+static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
+						  struct mhp_params *params)
 {
 	phys_addr_t pa;
 	uintptr_t va, map_size;
 
 	for (pa = start; pa < end; pa += map_size) {
+		pgprot_t pgprot;
+
 		va = (uintptr_t)__va(pa);
+		pgprot =  params ? params->pgprot : pgprot_from_va(va);
 		map_size = best_map_size(pa, end - pa);
-
-		create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
-				   pgprot_from_va(va));
+		create_pgd_mapping(swapper_pg_dir, va, pa, map_size, pgprot);
 	}
 }
 
@@ -1288,13 +1289,12 @@ 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);
+		create_linear_mapping_range(start, end, NULL);
 	}
 
 #ifdef CONFIG_STRICT_KERNEL_RWX
-	create_linear_mapping_range(ktext_start, ktext_start + ktext_size);
-	create_linear_mapping_range(krodata_start,
-				    krodata_start + krodata_size);
+	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, NULL);
+	create_linear_mapping_range(krodata_start, krodata_start + krodata_size, NULL);
 
 	memblock_clear_nomap(ktext_start,  ktext_size);
 	memblock_clear_nomap(krodata_start, krodata_size);
-- 
2.39.2