/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
+#include <inttypes.h>
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
+#include <unistd.h>
#include <sys/queue.h>
#include <rte_memory.h>
#include <rte_common.h>
#include <rte_spinlock.h>
+#include "eal_internal_cfg.h"
+#include "eal_memalloc.h"
#include "malloc_elem.h"
#include "malloc_heap.h"
-#define MIN_DATA_SIZE (RTE_CACHE_LINE_SIZE)
+size_t
+malloc_elem_find_max_iova_contig(struct malloc_elem *elem, size_t align)
+{
+ void *cur_page, *contig_seg_start, *page_end, *cur_seg_end;
+ void *data_start, *data_end;
+ rte_iova_t expected_iova;
+ struct rte_memseg *ms;
+ size_t page_sz, cur, max;
+
+ page_sz = (size_t)elem->msl->page_sz;
+ data_start = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN);
+ data_end = RTE_PTR_ADD(elem, elem->size - MALLOC_ELEM_TRAILER_LEN);
+ /* segment must start after header and with specified alignment */
+ contig_seg_start = RTE_PTR_ALIGN_CEIL(data_start, align);
+
+ /* if we're in IOVA as VA mode, or if we're in legacy mode with
+ * hugepages, all elements are IOVA-contiguous.
+ */
+ if (rte_eal_iova_mode() == RTE_IOVA_VA ||
+ (internal_config.legacy_mem && rte_eal_has_hugepages()))
+ return RTE_PTR_DIFF(data_end, contig_seg_start);
+
+ cur_page = RTE_PTR_ALIGN_FLOOR(contig_seg_start, page_sz);
+ ms = rte_mem_virt2memseg(cur_page, elem->msl);
+
+ /* do first iteration outside the loop */
+ page_end = RTE_PTR_ADD(cur_page, page_sz);
+ cur_seg_end = RTE_MIN(page_end, data_end);
+ cur = RTE_PTR_DIFF(cur_seg_end, contig_seg_start) -
+ MALLOC_ELEM_TRAILER_LEN;
+ max = cur;
+ expected_iova = ms->iova + page_sz;
+ /* memsegs are contiguous in memory */
+ ms++;
+
+ cur_page = RTE_PTR_ADD(cur_page, page_sz);
+
+ while (cur_page < data_end) {
+ page_end = RTE_PTR_ADD(cur_page, page_sz);
+ cur_seg_end = RTE_MIN(page_end, data_end);
+
+ /* reset start of contiguous segment if unexpected iova */
+ if (ms->iova != expected_iova) {
+ /* next contiguous segment must start at specified
+ * alignment.
+ */
+ contig_seg_start = RTE_PTR_ALIGN(cur_page, align);
+ /* new segment start may be on a different page, so find
+ * the page and skip to next iteration to make sure
+ * we're not blowing past data end.
+ */
+ ms = rte_mem_virt2memseg(contig_seg_start, elem->msl);
+ cur_page = ms->addr;
+ /* don't trigger another recalculation */
+ expected_iova = ms->iova;
+ continue;
+ }
+ /* cur_seg_end ends on a page boundary or on data end. if we're
+ * looking at data end, then malloc trailer is already included
+ * in the calculations. if we're looking at page end, then we
+ * know there's more data past this page and thus there's space
+ * for malloc element trailer, so don't count it here.
+ */
+ cur = RTE_PTR_DIFF(cur_seg_end, contig_seg_start);
+ /* update max if cur value is bigger */
+ if (cur > max)
+ max = cur;
+
+ /* move to next page */
+ cur_page = page_end;
+ expected_iova = ms->iova + page_sz;
+ /* memsegs are contiguous in memory */
+ ms++;
+ }
+
+ return max;
+}
/*
* Initialize a general malloc_elem header structure
*/
void
-malloc_elem_init(struct malloc_elem *elem,
- struct malloc_heap *heap, const struct rte_memseg *ms, size_t size)
+malloc_elem_init(struct malloc_elem *elem, struct malloc_heap *heap,
+ struct rte_memseg_list *msl, size_t size)
{
elem->heap = heap;
- elem->ms = ms;
+ elem->msl = msl;
elem->prev = NULL;
elem->next = NULL;
memset(&elem->free_list, 0, sizeof(elem->free_list));
struct malloc_elem *prev_elem, *next_elem;
struct malloc_heap *heap = elem->heap;
+ /* first and last elements must be both NULL or both non-NULL */
+ if ((heap->first == NULL) != (heap->last == NULL)) {
+ RTE_LOG(ERR, EAL, "Heap is probably corrupt\n");
+ return;
+ }
+
if (heap->first == NULL && heap->last == NULL) {
/* if empty heap */
heap->first = elem;
next_elem->prev = elem;
}
+/*
+ * Attempt to find enough physically contiguous memory in this block to store
+ * our data. Assume that element has at least enough space to fit in the data,
+ * so we just check the page addresses.
+ */
+static bool
+elem_check_phys_contig(const struct rte_memseg_list *msl,
+ void *start, size_t size)
+{
+ return eal_memalloc_is_contig(msl, start, size);
+}
+
/*
* calculate the starting point of where data of the requested size
* and alignment would fit in the current element. If the data doesn't
*/
static void *
elem_start_pt(struct malloc_elem *elem, size_t size, unsigned align,
- size_t bound)
+ size_t bound, bool contig)
{
- const size_t bmask = ~(bound - 1);
- uintptr_t end_pt = (uintptr_t)elem +
- elem->size - MALLOC_ELEM_TRAILER_LEN;
- uintptr_t new_data_start = RTE_ALIGN_FLOOR((end_pt - size), align);
- uintptr_t new_elem_start;
-
- /* check boundary */
- if ((new_data_start & bmask) != ((end_pt - 1) & bmask)) {
- end_pt = RTE_ALIGN_FLOOR(end_pt, bound);
- new_data_start = RTE_ALIGN_FLOOR((end_pt - size), align);
- end_pt = new_data_start + size;
- if (((end_pt - 1) & bmask) != (new_data_start & bmask))
- return NULL;
- }
+ size_t elem_size = elem->size;
- new_elem_start = new_data_start - MALLOC_ELEM_HEADER_LEN;
+ /*
+ * we're allocating from the end, so adjust the size of element by
+ * alignment size.
+ */
+ while (elem_size >= size) {
+ const size_t bmask = ~(bound - 1);
+ uintptr_t end_pt = (uintptr_t)elem +
+ elem_size - MALLOC_ELEM_TRAILER_LEN;
+ uintptr_t new_data_start = RTE_ALIGN_FLOOR((end_pt - size),
+ align);
+ uintptr_t new_elem_start;
+
+ /* check boundary */
+ if ((new_data_start & bmask) != ((end_pt - 1) & bmask)) {
+ end_pt = RTE_ALIGN_FLOOR(end_pt, bound);
+ new_data_start = RTE_ALIGN_FLOOR((end_pt - size),
+ align);
+ end_pt = new_data_start + size;
+
+ if (((end_pt - 1) & bmask) != (new_data_start & bmask))
+ return NULL;
+ }
+
+ new_elem_start = new_data_start - MALLOC_ELEM_HEADER_LEN;
+
+ /* if the new start point is before the exist start,
+ * it won't fit
+ */
+ if (new_elem_start < (uintptr_t)elem)
+ return NULL;
- /* if the new start point is before the exist start, it won't fit */
- return (new_elem_start < (uintptr_t)elem) ? NULL : (void *)new_elem_start;
+ if (contig) {
+ size_t new_data_size = end_pt - new_data_start;
+
+ /*
+ * if physical contiguousness was requested and we
+ * couldn't fit all data into one physically contiguous
+ * block, try again with lower addresses.
+ */
+ if (!elem_check_phys_contig(elem->msl,
+ (void *)new_data_start,
+ new_data_size)) {
+ elem_size -= align;
+ continue;
+ }
+ }
+ return (void *)new_elem_start;
+ }
+ return NULL;
}
/*
*/
int
malloc_elem_can_hold(struct malloc_elem *elem, size_t size, unsigned align,
- size_t bound)
+ size_t bound, bool contig)
{
- return elem_start_pt(elem, size, align, bound) != NULL;
+ return elem_start_pt(elem, size, align, bound, contig) != NULL;
}
/*
const size_t old_elem_size = (uintptr_t)split_pt - (uintptr_t)elem;
const size_t new_elem_size = elem->size - old_elem_size;
- malloc_elem_init(split_pt, elem->heap, elem->ms, new_elem_size);
+ malloc_elem_init(split_pt, elem->heap, elem->msl, new_elem_size);
split_pt->prev = elem;
split_pt->next = next_elem;
if (next_elem)
/*
* Remove the specified element from its heap's free list.
*/
-static void
-elem_free_list_remove(struct malloc_elem *elem)
+void
+malloc_elem_free_list_remove(struct malloc_elem *elem)
{
LIST_REMOVE(elem, free_list);
}
*/
struct malloc_elem *
malloc_elem_alloc(struct malloc_elem *elem, size_t size, unsigned align,
- size_t bound)
+ size_t bound, bool contig)
{
- struct malloc_elem *new_elem = elem_start_pt(elem, size, align, bound);
+ struct malloc_elem *new_elem = elem_start_pt(elem, size, align, bound,
+ contig);
const size_t old_elem_size = (uintptr_t)new_elem - (uintptr_t)elem;
const size_t trailer_size = elem->size - old_elem_size - size -
MALLOC_ELEM_OVERHEAD;
- elem_free_list_remove(elem);
+ malloc_elem_free_list_remove(elem);
if (trailer_size > MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
/* split it, too much free space after elem */
elem1->next = next;
}
-static struct malloc_elem *
-elem_join_adjacent_free(struct malloc_elem *elem)
+struct malloc_elem *
+malloc_elem_join_adjacent_free(struct malloc_elem *elem)
{
/*
* check if next element exists, is adjacent and is free, if so join
if (elem->next != NULL && elem->next->state == ELEM_FREE &&
next_elem_is_adjacent(elem)) {
void *erase;
+ size_t erase_len;
/* we will want to erase the trailer and header */
erase = RTE_PTR_SUB(elem->next, MALLOC_ELEM_TRAILER_LEN);
+ erase_len = MALLOC_ELEM_OVERHEAD + elem->next->pad;
/* remove from free list, join to this one */
- elem_free_list_remove(elem->next);
+ malloc_elem_free_list_remove(elem->next);
join_elem(elem, elem->next);
- /* erase header and trailer */
- memset(erase, 0, MALLOC_ELEM_OVERHEAD);
+ /* erase header, trailer and pad */
+ memset(erase, 0, erase_len);
}
/*
prev_elem_is_adjacent(elem)) {
struct malloc_elem *new_elem;
void *erase;
+ size_t erase_len;
/* we will want to erase trailer and header */
erase = RTE_PTR_SUB(elem, MALLOC_ELEM_TRAILER_LEN);
+ erase_len = MALLOC_ELEM_OVERHEAD + elem->pad;
/* remove from free list, join to this one */
- elem_free_list_remove(elem->prev);
+ malloc_elem_free_list_remove(elem->prev);
new_elem = elem->prev;
join_elem(new_elem, elem);
- /* erase header and trailer */
- memset(erase, 0, MALLOC_ELEM_OVERHEAD);
+ /* erase header, trailer and pad */
+ memset(erase, 0, erase_len);
elem = new_elem;
}
* blocks either immediately before or immediately after newly freed block
* are also free, the blocks are merged together.
*/
-int
+struct malloc_elem *
malloc_elem_free(struct malloc_elem *elem)
{
void *ptr;
size_t data_len;
- ptr = RTE_PTR_ADD(elem, sizeof(*elem));
- data_len = elem->size - MALLOC_ELEM_OVERHEAD;
+ ptr = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN + elem->pad);
+ data_len = elem->size - elem->pad - MALLOC_ELEM_OVERHEAD;
- elem = elem_join_adjacent_free(elem);
+ elem = malloc_elem_join_adjacent_free(elem);
malloc_elem_free_list_insert(elem);
+ elem->pad = 0;
+
/* decrease heap's count of allocated elements */
elem->heap->alloc_count--;
memset(ptr, 0, data_len);
- return 0;
+ return elem;
+}
+
+/* assume all checks were already done */
+void
+malloc_elem_hide_region(struct malloc_elem *elem, void *start, size_t len)
+{
+ struct malloc_elem *hide_start, *hide_end, *prev, *next;
+ size_t len_before, len_after;
+
+ hide_start = start;
+ hide_end = RTE_PTR_ADD(start, len);
+
+ prev = elem->prev;
+ next = elem->next;
+
+ /* we cannot do anything with non-adjacent elements */
+ if (next && next_elem_is_adjacent(elem)) {
+ len_after = RTE_PTR_DIFF(next, hide_end);
+ if (len_after >= MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
+ /* split after */
+ split_elem(elem, hide_end);
+
+ malloc_elem_free_list_insert(hide_end);
+ } else if (len_after > 0) {
+ RTE_LOG(ERR, EAL, "Unaligned element, heap is probably corrupt\n");
+ return;
+ }
+ }
+
+ /* we cannot do anything with non-adjacent elements */
+ if (prev && prev_elem_is_adjacent(elem)) {
+ len_before = RTE_PTR_DIFF(hide_start, elem);
+ if (len_before >= MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
+ /* split before */
+ split_elem(elem, hide_start);
+
+ prev = elem;
+ elem = hide_start;
+
+ malloc_elem_free_list_insert(prev);
+ } else if (len_before > 0) {
+ RTE_LOG(ERR, EAL, "Unaligned element, heap is probably corrupt\n");
+ return;
+ }
+ }
+
+ remove_elem(elem);
}
/*
/* we now know the element fits, so remove from free list,
* join the two
*/
- elem_free_list_remove(elem->next);
+ malloc_elem_free_list_remove(elem->next);
join_elem(elem, elem->next);
if (elem->size - new_size >= MIN_DATA_SIZE + MALLOC_ELEM_OVERHEAD) {
}
return 0;
}
+
+static inline const char *
+elem_state_to_str(enum elem_state state)
+{
+ switch (state) {
+ case ELEM_PAD:
+ return "PAD";
+ case ELEM_BUSY:
+ return "BUSY";
+ case ELEM_FREE:
+ return "FREE";
+ }
+ return "ERROR";
+}
+
+void
+malloc_elem_dump(const struct malloc_elem *elem, FILE *f)
+{
+ fprintf(f, "Malloc element at %p (%s)\n", elem,
+ elem_state_to_str(elem->state));
+ fprintf(f, " len: 0x%zx pad: 0x%" PRIx32 "\n", elem->size, elem->pad);
+ fprintf(f, " prev: %p next: %p\n", elem->prev, elem->next);
+}
git.droids-corp.org / dpdk.git / blobdiff