From: Casey Connolly <casey.connolly@linaro.org>
Date: Mon, 8 Jun 2026 17:13:49 +0000 (+0200)
Subject: armv8: mmu: teach the pagetable dumper to show explicit FAULT maps
X-Git-Tag: v2026.10-rc1~48^2~11^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41b6b904b58577c4aa7100e2850af0429e964283;p=thirdparty%2Fu-boot.git

armv8: mmu: teach the pagetable dumper to show explicit FAULT maps

When a region is explicitly unmapped (like with
mmu_change_region_attr(.... PTE_TYPE_FAULT)) the address translation
still remains but won't be used since the region is marked invalid.
Print these regions when we dump the pagetable to help with debugging.

Signed-off-by: Casey Connolly <casey.connolly@linaro.org>
---

diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
index f07204ed2fa..91c55591a1d 100644
--- a/arch/arm/cpu/armv8/cache_v8.c
+++ b/arch/arm/cpu/armv8/cache_v8.c
@@ -534,7 +534,7 @@ static void __pagetable_walk(u64 addr, u64 tcr, int level, pte_walker_cb_t cb, v
 		if (exit)
 			return;
 
-		if (pte_type(&pte) == PTE_TYPE_FAULT)
+		if (!pte)
 			continue;
 
 		attrs = pte & ALL_ATTRS;
@@ -573,7 +573,7 @@ static void __pagetable_walk(u64 addr, u64 tcr, int level, pte_walker_cb_t cb, v
 			/* Go down a level */
 			__pagetable_walk(_addr, tcr, level + 1, cb, priv);
 			state[level] = WALKER_STATE_START;
-		} else if (pte_type(&pte) == PTE_TYPE_BLOCK || pte_type(&pte) == PTE_TYPE_PAGE) {
+		} else {
 			/* We foud a block or page, start walking */
 			entry_start = pte;
 			state[level] = WALKER_STATE_REGION;