X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=lib%2Flibrte_eal%2Fcommon%2Fmalloc_elem.c;h=1a74660de434b6cdebf544c9a0f03199dbddc14b;hb=8d01b9cd70a67cdafd5b965a70420c3bd7fb3f82;hp=0cadc8aff12abd1b6c01630b2cfc833fb5bf6c25;hpb=ca33590b6af032bff57d9cc70455660466a654b2;p=deb_dpdk.git

diff --git a/lib/librte_eal/common/malloc_elem.c b/lib/librte_eal/common/malloc_elem.c
index 0cadc8af..1a74660d 100644
--- a/lib/librte_eal/common/malloc_elem.c
+++ b/lib/librte_eal/common/malloc_elem.c
@@ -1,10 +1,12 @@
 /* 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>
@@ -16,21 +18,104 @@
 #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. however, we can only
+	 * make these assumptions about internal memory - externally allocated
+	 * segments have to be checked.
+	 */
+	if (!elem->msl->external &&
+			(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));
 	elem->state = ELEM_FREE;
 	elem->size = size;
@@ -39,15 +124,74 @@ malloc_elem_init(struct malloc_elem *elem,
 	set_trailer(elem);
 }
 
+void
+malloc_elem_insert(struct malloc_elem *elem)
+{
+	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;
+		heap->last = elem;
+		prev_elem = NULL;
+		next_elem = NULL;
+	} else if (elem < heap->first) {
+		/* if lower than start */
+		prev_elem = NULL;
+		next_elem = heap->first;
+		heap->first = elem;
+	} else if (elem > heap->last) {
+		/* if higher than end */
+		prev_elem = heap->last;
+		next_elem = NULL;
+		heap->last = elem;
+	} else {
+		/* the new memory is somewhere inbetween start and end */
+		uint64_t dist_from_start, dist_from_end;
+
+		dist_from_end = RTE_PTR_DIFF(heap->last, elem);
+		dist_from_start = RTE_PTR_DIFF(elem, heap->first);
+
+		/* check which is closer, and find closest list entries */
+		if (dist_from_start < dist_from_end) {
+			prev_elem = heap->first;
+			while (prev_elem->next < elem)
+				prev_elem = prev_elem->next;
+			next_elem = prev_elem->next;
+		} else {
+			next_elem = heap->last;
+			while (next_elem->prev > elem)
+				next_elem = next_elem->prev;
+			prev_elem = next_elem->prev;
+		}
+	}
+
+	/* insert new element */
+	elem->prev = prev_elem;
+	elem->next = next_elem;
+	if (prev_elem)
+		prev_elem->next = elem;
+	if (next_elem)
+		next_elem->prev = elem;
+}
+
 /*
- * Initialize a dummy malloc_elem header for the end-of-memseg marker
+ * 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.
  */
-void
-malloc_elem_mkend(struct malloc_elem *elem, struct malloc_elem *prev)
+static bool
+elem_check_phys_contig(const struct rte_memseg_list *msl,
+		void *start, size_t size)
 {
-	malloc_elem_init(elem, prev->heap, prev->ms, 0);
-	elem->prev = prev;
-	elem->state = ELEM_BUSY; /* mark busy so its never merged */
+	return eal_memalloc_is_contig(msl, start, size);
 }
 
 /*
@@ -57,27 +201,59 @@ malloc_elem_mkend(struct malloc_elem *elem, struct malloc_elem *prev)
  */
 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;
+
+	/*
+	 * 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;
 
-	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;
 }
 
 /*
@@ -86,9 +262,9 @@ elem_start_pt(struct malloc_elem *elem, size_t size, unsigned align,
  */
 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;
 }
 
 /*
@@ -98,17 +274,57 @@ malloc_elem_can_hold(struct malloc_elem *elem, size_t size,	unsigned align,
 static void
 split_elem(struct malloc_elem *elem, struct malloc_elem *split_pt)
 {
-	struct malloc_elem *next_elem = RTE_PTR_ADD(elem, elem->size);
+	struct malloc_elem *next_elem = elem->next;
 	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;
-	next_elem->prev = split_pt;
+	split_pt->next = next_elem;
+	if (next_elem)
+		next_elem->prev = split_pt;
+	else
+		elem->heap->last = split_pt;
+	elem->next = split_pt;
 	elem->size = old_elem_size;
 	set_trailer(elem);
 }
 
+/*
+ * our malloc heap is a doubly linked list, so doubly remove our element.
+ */
+static void __rte_unused
+remove_elem(struct malloc_elem *elem)
+{
+	struct malloc_elem *next, *prev;
+	next = elem->next;
+	prev = elem->prev;
+
+	if (next)
+		next->prev = prev;
+	else
+		elem->heap->last = prev;
+	if (prev)
+		prev->next = next;
+	else
+		elem->heap->first = next;
+
+	elem->prev = NULL;
+	elem->next = NULL;
+}
+
+static int
+next_elem_is_adjacent(struct malloc_elem *elem)
+{
+	return elem->next == RTE_PTR_ADD(elem, elem->size);
+}
+
+static int
+prev_elem_is_adjacent(struct malloc_elem *elem)
+{
+	return elem == RTE_PTR_ADD(elem->prev, elem->prev->size);
+}
+
 /*
  * Given an element size, compute its freelist index.
  * We free an element into the freelist containing similarly-sized elements.
@@ -162,8 +378,8 @@ malloc_elem_free_list_insert(struct malloc_elem *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);
 }
@@ -176,14 +392,15 @@ elem_free_list_remove(struct malloc_elem *elem)
  */
 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 */
@@ -192,6 +409,9 @@ malloc_elem_alloc(struct malloc_elem *elem, size_t size, unsigned align,
 
 		split_elem(elem, new_free_elem);
 		malloc_elem_free_list_insert(new_free_elem);
+
+		if (elem == elem->heap->last)
+			elem->heap->last = new_free_elem;
 	}
 
 	if (old_elem_size < MALLOC_ELEM_OVERHEAD + MIN_DATA_SIZE) {
@@ -230,9 +450,66 @@ malloc_elem_alloc(struct malloc_elem *elem, size_t size, unsigned align,
 static inline void
 join_elem(struct malloc_elem *elem1, struct malloc_elem *elem2)
 {
-	struct malloc_elem *next = RTE_PTR_ADD(elem2, elem2->size);
+	struct malloc_elem *next = elem2->next;
 	elem1->size += elem2->size;
-	next->prev = elem1;
+	if (next)
+		next->prev = elem1;
+	else
+		elem1->heap->last = elem1;
+	elem1->next = next;
+}
+
+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
+	 * with it, need to remove from free list.
+	 */
+	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 */
+		malloc_elem_free_list_remove(elem->next);
+		join_elem(elem, elem->next);
+
+		/* erase header, trailer and pad */
+		memset(erase, 0, erase_len);
+	}
+
+	/*
+	 * check if prev element exists, is adjacent and is free, if so join
+	 * with it, need to remove from free list.
+	 */
+	if (elem->prev != NULL && elem->prev->state == ELEM_FREE &&
+			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 */
+		malloc_elem_free_list_remove(elem->prev);
+
+		new_elem = elem->prev;
+		join_elem(new_elem, elem);
+
+		/* erase header, trailer and pad */
+		memset(erase, 0, erase_len);
+
+		elem = new_elem;
+	}
+
+	return elem;
 }
 
 /*
@@ -240,43 +517,74 @@ join_elem(struct malloc_elem *elem1, struct malloc_elem *elem2)
  * 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)
 {
-	if (!malloc_elem_cookies_ok(elem) || elem->state != ELEM_BUSY)
-		return -1;
+	void *ptr;
+	size_t data_len;
 
-	rte_spinlock_lock(&(elem->heap->lock));
-	size_t sz = elem->size - sizeof(*elem) - MALLOC_ELEM_TRAILER_LEN;
-	uint8_t *ptr = (uint8_t *)&elem[1];
-	struct malloc_elem *next = RTE_PTR_ADD(elem, elem->size);
-	if (next->state == ELEM_FREE){
-		/* remove from free list, join to this one */
-		elem_free_list_remove(next);
-		join_elem(elem, next);
-		sz += (sizeof(*elem) + MALLOC_ELEM_TRAILER_LEN);
-	}
+	ptr = RTE_PTR_ADD(elem, MALLOC_ELEM_HEADER_LEN);
+	data_len = elem->size - MALLOC_ELEM_OVERHEAD;
+
+	elem = malloc_elem_join_adjacent_free(elem);
 
-	/* check if previous element is free, if so join with it and return,
-	 * need to re-insert in free list, as that element's size is changing
-	 */
-	if (elem->prev != NULL && elem->prev->state == ELEM_FREE) {
-		elem_free_list_remove(elem->prev);
-		join_elem(elem->prev, elem);
-		sz += (sizeof(*elem) + MALLOC_ELEM_TRAILER_LEN);
-		ptr -= (sizeof(*elem) + MALLOC_ELEM_TRAILER_LEN);
-		elem = elem->prev;
-	}
 	malloc_elem_free_list_insert(elem);
 
+	elem->pad = 0;
+
 	/* decrease heap's count of allocated elements */
 	elem->heap->alloc_count--;
 
-	memset(ptr, 0, sz);
+	memset(ptr, 0, data_len);
 
-	rte_spinlock_unlock(&(elem->heap->lock));
+	return elem;
+}
 
-	return 0;
+/* 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);
 }
 
 /*
@@ -287,22 +595,23 @@ int
 malloc_elem_resize(struct malloc_elem *elem, size_t size)
 {
 	const size_t new_size = size + elem->pad + MALLOC_ELEM_OVERHEAD;
+
 	/* if we request a smaller size, then always return ok */
 	if (elem->size >= new_size)
 		return 0;
 
-	struct malloc_elem *next = RTE_PTR_ADD(elem, elem->size);
-	rte_spinlock_lock(&elem->heap->lock);
-	if (next ->state != ELEM_FREE)
-		goto err_return;
-	if (elem->size + next->size < new_size)
-		goto err_return;
+	/* check if there is a next element, it's free and adjacent */
+	if (!elem->next || elem->next->state != ELEM_FREE ||
+			!next_elem_is_adjacent(elem))
+		return -1;
+	if (elem->size + elem->next->size < new_size)
+		return -1;
 
 	/* we now know the element fits, so remove from free list,
 	 * join the two
 	 */
-	elem_free_list_remove(next);
-	join_elem(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) {
 		/* now we have a big block together. Lets cut it down a bit, by splitting */
@@ -311,10 +620,28 @@ malloc_elem_resize(struct malloc_elem *elem, size_t size)
 		split_elem(elem, split_pt);
 		malloc_elem_free_list_insert(split_pt);
 	}
-	rte_spinlock_unlock(&elem->heap->lock);
 	return 0;
+}
 
-err_return:
-	rte_spinlock_unlock(&elem->heap->lock);
-	return -1;
+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);
 }