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-rw-r--r--arch/powerpc/mm/mem.c408
1 files changed, 408 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
new file mode 100644
index 000000000..c7599b173
--- /dev/null
+++ b/arch/powerpc/mm/mem.c
@@ -0,0 +1,408 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * PowerPC version
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
+ * and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ * Copyright (C) 1996 Paul Mackerras
+ * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
+ *
+ * Derived from "arch/i386/mm/init.c"
+ * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
+ */
+
+#include <linux/memblock.h>
+#include <linux/highmem.h>
+#include <linux/suspend.h>
+#include <linux/dma-direct.h>
+
+#include <asm/swiotlb.h>
+#include <asm/machdep.h>
+#include <asm/rtas.h>
+#include <asm/kasan.h>
+#include <asm/svm.h>
+#include <asm/mmzone.h>
+#include <asm/ftrace.h>
+#include <asm/code-patching.h>
+#include <asm/setup.h>
+
+#include <mm/mmu_decl.h>
+
+unsigned long long memory_limit;
+
+unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
+EXPORT_SYMBOL(empty_zero_page);
+
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+ unsigned long size, pgprot_t vma_prot)
+{
+ if (ppc_md.phys_mem_access_prot)
+ return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
+
+ if (!page_is_ram(pfn))
+ vma_prot = pgprot_noncached(vma_prot);
+
+ return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static DEFINE_MUTEX(linear_mapping_mutex);
+
+#ifdef CONFIG_NUMA
+int memory_add_physaddr_to_nid(u64 start)
+{
+ return hot_add_scn_to_nid(start);
+}
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
+
+int __weak create_section_mapping(unsigned long start, unsigned long end,
+ int nid, pgprot_t prot)
+{
+ return -ENODEV;
+}
+
+int __weak remove_section_mapping(unsigned long start, unsigned long end)
+{
+ return -ENODEV;
+}
+
+int __ref arch_create_linear_mapping(int nid, u64 start, u64 size,
+ struct mhp_params *params)
+{
+ int rc;
+
+ start = (unsigned long)__va(start);
+ mutex_lock(&linear_mapping_mutex);
+ rc = create_section_mapping(start, start + size, nid,
+ params->pgprot);
+ mutex_unlock(&linear_mapping_mutex);
+ if (rc) {
+ pr_warn("Unable to create linear mapping for 0x%llx..0x%llx: %d\n",
+ start, start + size, rc);
+ return -EFAULT;
+ }
+ return 0;
+}
+
+void __ref arch_remove_linear_mapping(u64 start, u64 size)
+{
+ int ret;
+
+ /* Remove htab bolted mappings for this section of memory */
+ start = (unsigned long)__va(start);
+
+ mutex_lock(&linear_mapping_mutex);
+ ret = remove_section_mapping(start, start + size);
+ mutex_unlock(&linear_mapping_mutex);
+ if (ret)
+ pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n",
+ start, start + size, ret);
+
+ /* Ensure all vmalloc mappings are flushed in case they also
+ * hit that section of memory
+ */
+ vm_unmap_aliases();
+}
+
+/*
+ * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
+ * updating.
+ */
+static void update_end_of_memory_vars(u64 start, u64 size)
+{
+ unsigned long end_pfn = PFN_UP(start + size);
+
+ if (end_pfn > max_pfn) {
+ max_pfn = end_pfn;
+ max_low_pfn = end_pfn;
+ high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
+ }
+}
+
+int __ref add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
+ struct mhp_params *params)
+{
+ int ret;
+
+ ret = __add_pages(nid, start_pfn, nr_pages, params);
+ if (ret)
+ return ret;
+
+ /* update max_pfn, max_low_pfn and high_memory */
+ update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
+ nr_pages << PAGE_SHIFT);
+
+ return ret;
+}
+
+int __ref arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_params *params)
+{
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+ int rc;
+
+ rc = arch_create_linear_mapping(nid, start, size, params);
+ if (rc)
+ return rc;
+ rc = add_pages(nid, start_pfn, nr_pages, params);
+ if (rc)
+ arch_remove_linear_mapping(start, size);
+ return rc;
+}
+
+void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+{
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ __remove_pages(start_pfn, nr_pages, altmap);
+ arch_remove_linear_mapping(start, size);
+}
+#endif
+
+#ifndef CONFIG_NUMA
+void __init mem_topology_setup(void)
+{
+ max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
+ min_low_pfn = MEMORY_START >> PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+ max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
+#endif
+
+ /* Place all memblock_regions in the same node and merge contiguous
+ * memblock_regions
+ */
+ memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
+}
+
+void __init initmem_init(void)
+{
+ sparse_init();
+}
+
+/* mark pages that don't exist as nosave */
+static int __init mark_nonram_nosave(void)
+{
+ unsigned long spfn, epfn, prev = 0;
+ int i;
+
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &spfn, &epfn, NULL) {
+ if (prev && prev < spfn)
+ register_nosave_region(prev, spfn);
+
+ prev = epfn;
+ }
+
+ return 0;
+}
+#else /* CONFIG_NUMA */
+static int __init mark_nonram_nosave(void)
+{
+ return 0;
+}
+#endif
+
+/*
+ * Zones usage:
+ *
+ * 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 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.
+ */
+static unsigned long max_zone_pfns[MAX_NR_ZONES];
+
+/*
+ * paging_init() sets up the page tables - in fact we've already done this.
+ */
+void __init paging_init(void)
+{
+ unsigned long long total_ram = memblock_phys_mem_size();
+ phys_addr_t top_of_ram = memblock_end_of_DRAM();
+
+#ifdef CONFIG_HIGHMEM
+ unsigned long v = __fix_to_virt(FIX_KMAP_END);
+ unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);
+
+ for (; v < end; v += PAGE_SIZE)
+ map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
+
+ map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
+ pkmap_page_table = virt_to_kpte(PKMAP_BASE);
+#endif /* CONFIG_HIGHMEM */
+
+ printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
+ (unsigned long long)top_of_ram, total_ram);
+ printk(KERN_DEBUG "Memory hole size: %ldMB\n",
+ (long int)((top_of_ram - total_ram) >> 20));
+
+ /*
+ * Allow 30-bit DMA for very limited Broadcom wifi chips on many
+ * powerbooks.
+ */
+ if (IS_ENABLED(CONFIG_PPC32))
+ zone_dma_bits = 30;
+ else
+ zone_dma_bits = 31;
+
+#ifdef CONFIG_ZONE_DMA
+ max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
+ 1UL << (zone_dma_bits - PAGE_SHIFT));
+#endif
+ max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+#ifdef CONFIG_HIGHMEM
+ max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
+#endif
+
+ free_area_init(max_zone_pfns);
+
+ mark_nonram_nosave();
+}
+
+void __init mem_init(void)
+{
+ /*
+ * book3s is limited to 16 page sizes due to encoding this in
+ * a 4-bit field for slices.
+ */
+ BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
+
+#ifdef CONFIG_SWIOTLB
+ /*
+ * Some platforms (e.g. 85xx) limit DMA-able memory way below
+ * 4G. We force memblock to bottom-up mode to ensure that the
+ * memory allocated in swiotlb_init() is DMA-able.
+ * As it's the last memblock allocation, no need to reset it
+ * back to to-down.
+ */
+ memblock_set_bottom_up(true);
+ swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
+#endif
+
+ high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+
+ kasan_late_init();
+
+ memblock_free_all();
+
+#ifdef CONFIG_HIGHMEM
+ {
+ unsigned long pfn, highmem_mapnr;
+
+ highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
+ for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
+ phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
+ struct page *page = pfn_to_page(pfn);
+ if (memblock_is_memory(paddr) && !memblock_is_reserved(paddr))
+ free_highmem_page(page);
+ }
+ }
+#endif /* CONFIG_HIGHMEM */
+
+#if defined(CONFIG_PPC_E500) && !defined(CONFIG_SMP)
+ /*
+ * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
+ * functions.... do it here for the non-smp case.
+ */
+ per_cpu(next_tlbcam_idx, smp_processor_id()) =
+ (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
+#endif
+
+#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 */
+ 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);
+#ifdef MODULES_VADDR
+ pr_info(" * 0x%08lx..0x%08lx : modules\n",
+ MODULES_VADDR, MODULES_END);
+#endif
+#endif /* CONFIG_PPC32 */
+}
+
+void free_initmem(void)
+{
+ ppc_md.progress = ppc_printk_progress;
+ mark_initmem_nx();
+ static_branch_enable(&init_mem_is_free);
+ free_initmem_default(POISON_FREE_INITMEM);
+ ftrace_free_init_tramp();
+}
+
+/*
+ * System memory should not be in /proc/iomem but various tools expect it
+ * (eg kdump).
+ */
+static int __init add_system_ram_resources(void)
+{
+ phys_addr_t start, end;
+ u64 i;
+
+ for_each_mem_range(i, &start, &end) {
+ struct resource *res;
+
+ res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+ WARN_ON(!res);
+
+ if (res) {
+ res->name = "System RAM";
+ res->start = start;
+ /*
+ * In memblock, end points to the first byte after
+ * the range while in resourses, end points to the
+ * last byte in the range.
+ */
+ res->end = end - 1;
+ res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
+ WARN_ON(request_resource(&iomem_resource, res) < 0);
+ }
+ }
+
+ return 0;
+}
+subsys_initcall(add_system_ram_resources);
+
+#ifdef CONFIG_STRICT_DEVMEM
+/*
+ * devmem_is_allowed(): check to see if /dev/mem access to a certain address
+ * is valid. The argument is a physical page number.
+ *
+ * Access has to be given to non-kernel-ram areas as well, these contain the
+ * PCI mmio resources as well as potential bios/acpi data regions.
+ */
+int devmem_is_allowed(unsigned long pfn)
+{
+ if (page_is_rtas_user_buf(pfn))
+ return 1;
+ if (iomem_is_exclusive(PFN_PHYS(pfn)))
+ return 0;
+ if (!page_is_ram(pfn))
+ return 1;
+ 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);
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