Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 04ccb27..be941d3 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PowerPC version
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
@@ -9,12 +10,6 @@
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
*/
#include <linux/export.h>
@@ -27,12 +22,11 @@
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/init.h>
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
#include <linux/highmem.h>
#include <linux/initrd.h>
#include <linux/pagemap.h>
#include <linux/suspend.h>
-#include <linux/memblock.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@@ -55,7 +49,7 @@
#include <asm/swiotlb.h>
#include <asm/rtas.h>
-#include "mmu_decl.h"
+#include <mm/mmu_decl.h>
#ifndef CPU_FTR_COHERENT_ICACHE
#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
@@ -70,22 +64,14 @@
EXPORT_SYMBOL(kmap_pte);
pgprot_t kmap_prot;
EXPORT_SYMBOL(kmap_prot);
-#define TOP_ZONE ZONE_HIGHMEM
static inline pte_t *virt_to_kpte(unsigned long vaddr)
{
return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
vaddr), vaddr), vaddr);
}
-#else
-#define TOP_ZONE ZONE_NORMAL
#endif
-int page_is_ram(unsigned long pfn)
-{
- return memblock_is_memory(__pfn_to_phys(pfn));
-}
-
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot)
{
@@ -118,8 +104,8 @@
return -ENODEV;
}
-int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
- bool want_memblock)
+int __ref arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_restrictions *restrictions)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
@@ -134,75 +120,36 @@
start, start + size, rc);
return -EFAULT;
}
- flush_inval_dcache_range(start, start + size);
+ flush_dcache_range(start, start + size);
- return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
+ return __add_pages(nid, start_pfn, nr_pages, restrictions);
}
-#ifdef CONFIG_MEMORY_HOTREMOVE
-int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+void __ref arch_remove_memory(int nid, u64 start, u64 size,
+ struct vmem_altmap *altmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
- struct page *page;
+ struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
int ret;
- /*
- * If we have an altmap then we need to skip over any reserved PFNs
- * when querying the zone.
- */
- page = pfn_to_page(start_pfn);
- if (altmap)
- page += vmem_altmap_offset(altmap);
-
- ret = __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
- if (ret)
- return ret;
+ __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
/* Remove htab bolted mappings for this section of memory */
start = (unsigned long)__va(start);
- flush_inval_dcache_range(start, start + size);
+ flush_dcache_range(start, start + size);
ret = remove_section_mapping(start, start + size);
+ WARN_ON_ONCE(ret);
/* Ensure all vmalloc mappings are flushed in case they also
* hit that section of memory
*/
vm_unmap_aliases();
- resize_hpt_for_hotplug(memblock_phys_mem_size());
-
- return ret;
+ if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
+ pr_warn("Hash collision while resizing HPT\n");
}
#endif
-#endif /* CONFIG_MEMORY_HOTPLUG */
-
-/*
- * walk_memory_resource() needs to make sure there is no holes in a given
- * memory range. PPC64 does not maintain the memory layout in /proc/iomem.
- * Instead it maintains it in memblock.memory structures. Walk through the
- * memory regions, find holes and callback for contiguous regions.
- */
-int
-walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
- void *arg, int (*func)(unsigned long, unsigned long, void *))
-{
- struct memblock_region *reg;
- unsigned long end_pfn = start_pfn + nr_pages;
- unsigned long tstart, tend;
- int ret = -1;
-
- for_each_memblock(memory, reg) {
- tstart = max(start_pfn, memblock_region_memory_base_pfn(reg));
- tend = min(end_pfn, memblock_region_memory_end_pfn(reg));
- if (tstart >= tend)
- continue;
- ret = (*func)(tstart, tend - tstart, arg);
- if (ret)
- break;
- }
- return ret;
-}
-EXPORT_SYMBOL_GPL(walk_system_ram_range);
#ifndef CONFIG_NEED_MULTIPLE_NODES
void __init mem_topology_setup(void)
@@ -247,54 +194,19 @@
}
#endif
-static bool zone_limits_final;
-
/*
- * The memory zones past TOP_ZONE are managed by generic mm code.
- * These should be set to zero since that's what every other
- * architecture does.
- */
-static unsigned long max_zone_pfns[MAX_NR_ZONES] = {
- [0 ... TOP_ZONE ] = ~0UL,
- [TOP_ZONE + 1 ... MAX_NR_ZONES - 1] = 0
-};
-
-/*
- * Restrict the specified zone and all more restrictive zones
- * to be below the specified pfn. May not be called after
- * paging_init().
- */
-void __init limit_zone_pfn(enum zone_type zone, unsigned long pfn_limit)
-{
- int i;
-
- if (WARN_ON(zone_limits_final))
- return;
-
- for (i = zone; i >= 0; i--) {
- if (max_zone_pfns[i] > pfn_limit)
- max_zone_pfns[i] = pfn_limit;
- }
-}
-
-/*
- * Find the least restrictive zone that is entirely below the
- * specified pfn limit. Returns < 0 if no suitable zone is found.
+ * Zones usage:
*
- * pfn_limit must be u64 because it can exceed 32 bits even on 32-bit
- * systems -- the DMA limit can be higher than any possible real pfn.
+ * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
+ * everything else. GFP_DMA32 page allocations automatically fall back to
+ * ZONE_DMA.
+ *
+ * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
+ * inform the generic DMA mapping code. 32-bit only devices (if not handled
+ * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
+ * otherwise served by ZONE_DMA.
*/
-int dma_pfn_limit_to_zone(u64 pfn_limit)
-{
- int i;
-
- for (i = TOP_ZONE; i >= 0; i--) {
- if (max_zone_pfns[i] <= pfn_limit)
- return i;
- }
-
- return -EPERM;
-}
+static unsigned long max_zone_pfns[MAX_NR_ZONES];
/*
* paging_init() sets up the page tables - in fact we've already done this.
@@ -309,11 +221,11 @@
unsigned long end = __fix_to_virt(FIX_HOLE);
for (; v < end; v += PAGE_SIZE)
- map_kernel_page(v, 0, 0); /* XXX gross */
+ map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
#endif
#ifdef CONFIG_HIGHMEM
- map_kernel_page(PKMAP_BASE, 0, 0); /* XXX gross */
+ map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
pkmap_page_table = virt_to_kpte(PKMAP_BASE);
kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
@@ -325,11 +237,15 @@
printk(KERN_DEBUG "Memory hole size: %ldMB\n",
(long int)((top_of_ram - total_ram) >> 20));
-#ifdef CONFIG_HIGHMEM
- limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
+#ifdef CONFIG_ZONE_DMA
+ max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
+ 1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
#endif
- limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT);
- zone_limits_final = true;
+ max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+ max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
+#endif
+
free_area_init_nodes(max_zone_pfns);
mark_nonram_nosave();
@@ -349,7 +265,7 @@
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
set_max_mapnr(max_pfn);
- free_all_bootmem();
+ memblock_free_all();
#ifdef CONFIG_HIGHMEM
{
@@ -377,17 +293,18 @@
mem_init_print_info(NULL);
#ifdef CONFIG_PPC32
pr_info("Kernel virtual memory layout:\n");
+#ifdef CONFIG_KASAN
+ pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
+ KASAN_SHADOW_START, KASAN_SHADOW_END);
+#endif
pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
#ifdef CONFIG_HIGHMEM
pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
#endif /* CONFIG_HIGHMEM */
-#ifdef CONFIG_NOT_COHERENT_CACHE
- pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
- IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
-#endif /* CONFIG_NOT_COHERENT_CACHE */
- pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
- ioremap_bot, IOREMAP_TOP);
+ if (ioremap_bot != IOREMAP_TOP)
+ pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
+ ioremap_bot, IOREMAP_TOP);
pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
VMALLOC_START, VMALLOC_END);
#endif /* CONFIG_PPC32 */
@@ -401,13 +318,6 @@
free_initmem_default(POISON_FREE_INITMEM);
}
-#ifdef CONFIG_BLK_DEV_INITRD
-void __init free_initrd_mem(unsigned long start, unsigned long end)
-{
- free_reserved_area((void *)start, (void *)end, -1, "initrd");
-}
-#endif
-
/*
* This is called when a page has been modified by the kernel.
* It just marks the page as not i-cache clean. We do the i-cache
@@ -494,62 +404,6 @@
EXPORT_SYMBOL(flush_icache_user_range);
/*
- * This is called at the end of handling a user page fault, when the
- * fault has been handled by updating a PTE in the linux page tables.
- * We use it to preload an HPTE into the hash table corresponding to
- * the updated linux PTE.
- *
- * This must always be called with the pte lock held.
- */
-void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
- pte_t *ptep)
-{
-#ifdef CONFIG_PPC_STD_MMU
- /*
- * We don't need to worry about _PAGE_PRESENT here because we are
- * called with either mm->page_table_lock held or ptl lock held
- */
- unsigned long access, trap;
-
- if (radix_enabled()) {
- prefetch((void *)address);
- return;
- }
-
- /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
- if (!pte_young(*ptep) || address >= TASK_SIZE)
- return;
-
- /* We try to figure out if we are coming from an instruction
- * access fault and pass that down to __hash_page so we avoid
- * double-faulting on execution of fresh text. We have to test
- * for regs NULL since init will get here first thing at boot
- *
- * We also avoid filling the hash if not coming from a fault
- */
-
- trap = current->thread.regs ? TRAP(current->thread.regs) : 0UL;
- switch (trap) {
- case 0x300:
- access = 0UL;
- break;
- case 0x400:
- access = _PAGE_EXEC;
- break;
- default:
- return;
- }
-
- hash_preload(vma->vm_mm, address, access, trap);
-#endif /* CONFIG_PPC_STD_MMU */
-#if (defined(CONFIG_PPC_BOOK3E_64) || defined(CONFIG_PPC_FSL_BOOK3E)) \
- && defined(CONFIG_HUGETLB_PAGE)
- if (is_vm_hugetlb_page(vma))
- book3e_hugetlb_preload(vma, address, *ptep);
-#endif
-}
-
-/*
* System memory should not be in /proc/iomem but various tools expect it
* (eg kdump).
*/
@@ -597,3 +451,9 @@
return 0;
}
#endif /* CONFIG_STRICT_DEVMEM */
+
+/*
+ * This is defined in kernel/resource.c but only powerpc needs to export it, for
+ * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
+ */
+EXPORT_SYMBOL_GPL(walk_system_ram_range);