summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/book3s_hv_cma.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_cma.c')
-rw-r--r--arch/powerpc/kvm/book3s_hv_cma.c240
1 files changed, 0 insertions, 240 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_cma.c b/arch/powerpc/kvm/book3s_hv_cma.c
deleted file mode 100644
index d9d3d8553d51..000000000000
--- a/arch/powerpc/kvm/book3s_hv_cma.c
+++ /dev/null
@@ -1,240 +0,0 @@
-/*
- * Contiguous Memory Allocator for ppc KVM hash pagetable based on CMA
- * for DMA mapping framework
- *
- * Copyright IBM Corporation, 2013
- * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
- *
- * 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 optional) any later version of the license.
- *
- */
-#define pr_fmt(fmt) "kvm_cma: " fmt
-
-#ifdef CONFIG_CMA_DEBUG
-#ifndef DEBUG
-# define DEBUG
-#endif
-#endif
-
-#include <linux/memblock.h>
-#include <linux/mutex.h>
-#include <linux/sizes.h>
-#include <linux/slab.h>
-
-#include "book3s_hv_cma.h"
-
-struct kvm_cma {
- unsigned long base_pfn;
- unsigned long count;
- unsigned long *bitmap;
-};
-
-static DEFINE_MUTEX(kvm_cma_mutex);
-static struct kvm_cma kvm_cma_area;
-
-/**
- * kvm_cma_declare_contiguous() - reserve area for contiguous memory handling
- * for kvm hash pagetable
- * @size: Size of the reserved memory.
- * @alignment: Alignment for the contiguous memory area
- *
- * This function reserves memory for kvm cma area. It should be
- * called by arch code when early allocator (memblock or bootmem)
- * is still activate.
- */
-long __init kvm_cma_declare_contiguous(phys_addr_t size, phys_addr_t alignment)
-{
- long base_pfn;
- phys_addr_t addr;
- struct kvm_cma *cma = &kvm_cma_area;
-
- pr_debug("%s(size %lx)\n", __func__, (unsigned long)size);
-
- if (!size)
- return -EINVAL;
- /*
- * Sanitise input arguments.
- * We should be pageblock aligned for CMA.
- */
- alignment = max(alignment, (phys_addr_t)(PAGE_SIZE << pageblock_order));
- size = ALIGN(size, alignment);
- /*
- * Reserve memory
- * Use __memblock_alloc_base() since
- * memblock_alloc_base() panic()s.
- */
- addr = __memblock_alloc_base(size, alignment, 0);
- if (!addr) {
- base_pfn = -ENOMEM;
- goto err;
- } else
- base_pfn = PFN_DOWN(addr);
-
- /*
- * Each reserved area must be initialised later, when more kernel
- * subsystems (like slab allocator) are available.
- */
- cma->base_pfn = base_pfn;
- cma->count = size >> PAGE_SHIFT;
- pr_info("CMA: reserved %ld MiB\n", (unsigned long)size / SZ_1M);
- return 0;
-err:
- pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
- return base_pfn;
-}
-
-/**
- * kvm_alloc_cma() - allocate pages from contiguous area
- * @nr_pages: Requested number of pages.
- * @align_pages: Requested alignment in number of pages
- *
- * This function allocates memory buffer for hash pagetable.
- */
-struct page *kvm_alloc_cma(unsigned long nr_pages, unsigned long align_pages)
-{
- int ret;
- struct page *page = NULL;
- struct kvm_cma *cma = &kvm_cma_area;
- unsigned long chunk_count, nr_chunk;
- unsigned long mask, pfn, pageno, start = 0;
-
-
- if (!cma || !cma->count)
- return NULL;
-
- pr_debug("%s(cma %p, count %lu, align pages %lu)\n", __func__,
- (void *)cma, nr_pages, align_pages);
-
- if (!nr_pages)
- return NULL;
- /*
- * align mask with chunk size. The bit tracks pages in chunk size
- */
- VM_BUG_ON(!is_power_of_2(align_pages));
- mask = (align_pages >> (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT)) - 1;
- BUILD_BUG_ON(PAGE_SHIFT > KVM_CMA_CHUNK_ORDER);
-
- chunk_count = cma->count >> (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
- nr_chunk = nr_pages >> (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
-
- mutex_lock(&kvm_cma_mutex);
- for (;;) {
- pageno = bitmap_find_next_zero_area(cma->bitmap, chunk_count,
- start, nr_chunk, mask);
- if (pageno >= chunk_count)
- break;
-
- pfn = cma->base_pfn + (pageno << (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT));
- ret = alloc_contig_range(pfn, pfn + nr_pages, MIGRATE_CMA);
- if (ret == 0) {
- bitmap_set(cma->bitmap, pageno, nr_chunk);
- page = pfn_to_page(pfn);
- memset(pfn_to_kaddr(pfn), 0, nr_pages << PAGE_SHIFT);
- break;
- } else if (ret != -EBUSY) {
- break;
- }
- pr_debug("%s(): memory range at %p is busy, retrying\n",
- __func__, pfn_to_page(pfn));
- /* try again with a bit different memory target */
- start = pageno + mask + 1;
- }
- mutex_unlock(&kvm_cma_mutex);
- pr_debug("%s(): returned %p\n", __func__, page);
- return page;
-}
-
-/**
- * kvm_release_cma() - release allocated pages for hash pagetable
- * @pages: Allocated pages.
- * @nr_pages: Number of allocated pages.
- *
- * This function releases memory allocated by kvm_alloc_cma().
- * It returns false when provided pages do not belong to contiguous area and
- * true otherwise.
- */
-bool kvm_release_cma(struct page *pages, unsigned long nr_pages)
-{
- unsigned long pfn;
- unsigned long nr_chunk;
- struct kvm_cma *cma = &kvm_cma_area;
-
- if (!cma || !pages)
- return false;
-
- pr_debug("%s(page %p count %lu)\n", __func__, (void *)pages, nr_pages);
-
- pfn = page_to_pfn(pages);
-
- if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count)
- return false;
-
- VM_BUG_ON(pfn + nr_pages > cma->base_pfn + cma->count);
- nr_chunk = nr_pages >> (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
-
- mutex_lock(&kvm_cma_mutex);
- bitmap_clear(cma->bitmap,
- (pfn - cma->base_pfn) >> (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT),
- nr_chunk);
- free_contig_range(pfn, nr_pages);
- mutex_unlock(&kvm_cma_mutex);
-
- return true;
-}
-
-static int __init kvm_cma_activate_area(unsigned long base_pfn,
- unsigned long count)
-{
- unsigned long pfn = base_pfn;
- unsigned i = count >> pageblock_order;
- struct zone *zone;
-
- WARN_ON_ONCE(!pfn_valid(pfn));
- zone = page_zone(pfn_to_page(pfn));
- do {
- unsigned j;
- base_pfn = pfn;
- for (j = pageblock_nr_pages; j; --j, pfn++) {
- WARN_ON_ONCE(!pfn_valid(pfn));
- /*
- * alloc_contig_range requires the pfn range
- * specified to be in the same zone. Make this
- * simple by forcing the entire CMA resv range
- * to be in the same zone.
- */
- if (page_zone(pfn_to_page(pfn)) != zone)
- return -EINVAL;
- }
- init_cma_reserved_pageblock(pfn_to_page(base_pfn));
- } while (--i);
- return 0;
-}
-
-static int __init kvm_cma_init_reserved_areas(void)
-{
- int bitmap_size, ret;
- unsigned long chunk_count;
- struct kvm_cma *cma = &kvm_cma_area;
-
- pr_debug("%s()\n", __func__);
- if (!cma->count)
- return 0;
- chunk_count = cma->count >> (KVM_CMA_CHUNK_ORDER - PAGE_SHIFT);
- bitmap_size = BITS_TO_LONGS(chunk_count) * sizeof(long);
- cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
- if (!cma->bitmap)
- return -ENOMEM;
-
- ret = kvm_cma_activate_area(cma->base_pfn, cma->count);
- if (ret)
- goto error;
- return 0;
-
-error:
- kfree(cma->bitmap);
- return ret;
-}
-core_initcall(kvm_cma_init_reserved_areas);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-14 13:15:29 +0100