[merged mm-stable] powerpc-64e-drop-mmu_ftr_type_fsl_e-checks-in-64-bit-code.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: powerpc/64e: drop MMU_FTR_TYPE_FSL_E checks in 64-bit code
has been removed from the -mm tree.  Its filename was
     powerpc-64e-drop-mmu_ftr_type_fsl_e-checks-in-64-bit-code.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Michael Ellerman <mpe@ellerman.id.au>
Subject: powerpc/64e: drop MMU_FTR_TYPE_FSL_E checks in 64-bit code
Date: Tue, 2 Jul 2024 15:51:16 +0200

All 64-bit Book3E have MMU_FTR_TYPE_FSL_E, since A2 was removed, so remove
checks for it in 64-bit only code.

Link: https://lkml.kernel.org/r/2b0b0bc9752e6cece222e4e2050358da70bb631d.1719928057.git.christophe.leroy@csgroup.eu
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/powerpc/kernel/setup_64.c   |    6 -
 arch/powerpc/mm/nohash/tlb_64e.c |  101 +++++++++++------------------
 2 files changed, 40 insertions(+), 67 deletions(-)

--- a/arch/powerpc/kernel/setup_64.c~powerpc-64e-drop-mmu_ftr_type_fsl_e-checks-in-64-bit-code
+++ a/arch/powerpc/kernel/setup_64.c
@@ -696,11 +696,7 @@ __init u64 ppc64_bolted_size(void)
 {
 #ifdef CONFIG_PPC_BOOK3E_64
 	/* Freescale BookE bolts the entire linear mapping */
-	/* XXX: BookE ppc64_rma_limit setup seems to disagree? */
-	if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E))
-		return linear_map_top;
-	/* Other BookE, we assume the first GB is bolted */
-	return 1ul << 30;
+	return linear_map_top;
 #else
 	/* BookS radix, does not take faults on linear mapping */
 	if (early_radix_enabled())
--- a/arch/powerpc/mm/nohash/tlb_64e.c~powerpc-64e-drop-mmu_ftr_type_fsl_e-checks-in-64-bit-code
+++ a/arch/powerpc/mm/nohash/tlb_64e.c
@@ -86,9 +86,8 @@ static void __init setup_page_sizes(void
 	int psize;
 
 	unsigned int mmucfg = mfspr(SPRN_MMUCFG);
-	int fsl_mmu = mmu_has_feature(MMU_FTR_TYPE_FSL_E);
 
-	if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
+	if ((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
 		unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG);
 		unsigned int min_pg, max_pg;
 
@@ -115,7 +114,7 @@ static void __init setup_page_sizes(void
 		goto out;
 	}
 
-	if (fsl_mmu && (mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) {
+	if ((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V2) {
 		u32 tlb1cfg, tlb1ps;
 
 		tlb0cfg = mfspr(SPRN_TLB0CFG);
@@ -213,26 +212,24 @@ static void early_init_this_mmu(void)
 	}
 	mtspr(SPRN_MAS4, mas4);
 
-	if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
-		unsigned int num_cams;
-		bool map = true;
+	unsigned int num_cams;
+	bool map = true;
 
-		/* use a quarter of the TLBCAM for bolted linear map */
-		num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
+	/* use a quarter of the TLBCAM for bolted linear map */
+	num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
 
-		/*
-		 * Only do the mapping once per core, or else the
-		 * transient mapping would cause problems.
-		 */
+	/*
+	 * Only do the mapping once per core, or else the
+	 * transient mapping would cause problems.
+	 */
 #ifdef CONFIG_SMP
-		if (hweight32(get_tensr()) > 1)
-			map = false;
+	if (hweight32(get_tensr()) > 1)
+		map = false;
 #endif
 
-		if (map)
-			linear_map_top = map_mem_in_cams(linear_map_top,
-							 num_cams, false, true);
-	}
+	if (map)
+		linear_map_top = map_mem_in_cams(linear_map_top,
+						 num_cams, false, true);
 
 	/* A sync won't hurt us after mucking around with
 	 * the MMU configuration
@@ -242,16 +239,10 @@ static void early_init_this_mmu(void)
 
 static void __init early_init_mmu_global(void)
 {
-	/* XXX This should be decided at runtime based on supported
-	 * page sizes in the TLB, but for now let's assume 16M is
-	 * always there and a good fit (which it probably is)
-	 *
+	/*
 	 * Freescale booke only supports 4K pages in TLB0, so use that.
 	 */
-	if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
-		mmu_vmemmap_psize = MMU_PAGE_4K;
-	else
-		mmu_vmemmap_psize = MMU_PAGE_16M;
+	mmu_vmemmap_psize = MMU_PAGE_4K;
 
 	/* XXX This code only checks for TLB 0 capabilities and doesn't
 	 *     check what page size combos are supported by the HW. It
@@ -264,13 +255,10 @@ static void __init early_init_mmu_global
 	/* Look for HW tablewalk support */
 	setup_mmu_htw();
 
-	if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
-		if (book3e_htw_mode == PPC_HTW_NONE) {
-			extlb_level_exc = EX_TLB_SIZE;
-			patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
-			patch_exception(0x1e0,
-				exc_instruction_tlb_miss_bolted_book3e);
-		}
+	if (book3e_htw_mode == PPC_HTW_NONE) {
+		extlb_level_exc = EX_TLB_SIZE;
+		patch_exception(0x1c0, exc_data_tlb_miss_bolted_book3e);
+		patch_exception(0x1e0, exc_instruction_tlb_miss_bolted_book3e);
 	}
 
 	/* Set the global containing the top of the linear mapping
@@ -283,16 +271,14 @@ static void __init early_init_mmu_global
 
 static void __init early_mmu_set_memory_limit(void)
 {
-	if (mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
-		/*
-		 * Limit memory so we dont have linear faults.
-		 * Unlike memblock_set_current_limit, which limits
-		 * memory available during early boot, this permanently
-		 * reduces the memory available to Linux.  We need to
-		 * do this because highmem is not supported on 64-bit.
-		 */
-		memblock_enforce_memory_limit(linear_map_top);
-	}
+	/*
+	 * Limit memory so we dont have linear faults.
+	 * Unlike memblock_set_current_limit, which limits
+	 * memory available during early boot, this permanently
+	 * reduces the memory available to Linux.  We need to
+	 * do this because highmem is not supported on 64-bit.
+	 */
+	memblock_enforce_memory_limit(linear_map_top);
 
 	memblock_set_current_limit(linear_map_top);
 }
@@ -313,12 +299,8 @@ void early_init_mmu_secondary(void)
 void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 				phys_addr_t first_memblock_size)
 {
-	/* On non-FSL Embedded 64-bit, we adjust the RMA size to match
-	 * the bolted TLB entry. We know for now that only 1G
-	 * entries are supported though that may eventually
-	 * change.
-	 *
-	 * on FSL Embedded 64-bit, usually all RAM is bolted, but with
+	/*
+	 * On FSL Embedded 64-bit, usually all RAM is bolted, but with
 	 * unusual memory sizes it's possible for some RAM to not be mapped
 	 * (such RAM is not used at all by Linux, since we don't support
 	 * highmem on 64-bit).  We limit ppc64_rma_size to what would be
@@ -330,19 +312,14 @@ void setup_initial_memory_limit(phys_add
 	 * We crop it to the size of the first MEMBLOCK to
 	 * avoid going over total available memory just in case...
 	 */
-	if (early_mmu_has_feature(MMU_FTR_TYPE_FSL_E)) {
-		unsigned long linear_sz;
-		unsigned int num_cams;
-
-		/* use a quarter of the TLBCAM for bolted linear map */
-		num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
-
-		linear_sz = map_mem_in_cams(first_memblock_size, num_cams,
-					    true, true);
-
-		ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
-	} else
-		ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000);
+	unsigned long linear_sz;
+	unsigned int num_cams;
+
+	/* use a quarter of the TLBCAM for bolted linear map */
+	num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
+
+	linear_sz = map_mem_in_cams(first_memblock_size, num_cams, true, true);
+	ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
 
 	/* Finally limit subsequent allocations */
 	memblock_set_current_limit(first_memblock_base + ppc64_rma_size);
_

Patches currently in -mm which might be from mpe@ellerman.id.au are