src/lib/alloc.c

/*
 * Copyright (c) 2016, Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of the Intel Corporation nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
 *         Keyon Jie <yang.jie@linux.intel.com>
 */

#include <reef/alloc.h>
#include <reef/reef.h>
#include <reef/debug.h>
#include <reef/trace.h>
#include <reef/lock.h>
#include <platform/memory.h>
#include <stdint.h>

/* debug to set memory value on every allocation */
#define DEBUG_BLOCK_ALLOC		0
#define DEBUG_BLOCK_ALLOC_VALUE		0x6b6b6b6b

/* debug to set memory value on every free TODO: not working atm */
#define DEBUG_BLOCK_FREE		0
#define DEBUG_BLOCK_FREE_VALUE		0x5a5a5a5a

/* memory tracing support */
#if DEBUG_BLOCK_ALLOC || DEBUG_BLOCK_FREE
#define trace_mem(__e)	trace_event(TRACE_CLASS_MEM, __e)
#else
#define trace_mem(__e)
#endif

#define trace_mem_error(__e)	trace_error(TRACE_CLASS_MEM, __e)

/* We have 3 memory pools
 *
 * 1) System memory pool does not have a map and it's size is fixed at build
 *    time. Memory cannot be freed from this pool. Used by device drivers
 *    and any system core. Saved as part of PM context.
 * 2) Runtime memory pool has variable size allocation map and memory is freed
 *    on calls to rfree(). Saved as part of PM context. Global size
 *    set at build time.
 * 3) Buffer memory pool has fixed size allocation map and can be freed on
 *    module removal or calls to rfree(). Saved as part of PM context.
 */

struct block_hdr {
	uint16_t size;		/* size in blocks of this continuous allocation */
	uint16_t flags;		/* usage flags for page */
} __attribute__ ((packed));

struct block_map {
	uint16_t block_size;	/* size of block in bytes */
	uint16_t count;		/* number of blocks in map */
	uint16_t free_count;	/* number of free blocks */
	uint16_t first_free;	/* index of first free block */
	struct block_hdr *block;	/* base block header */
	uint32_t base;		/* base address of space */
} __attribute__ ((packed));

#define BLOCK_DEF(sz, cnt, hdr) \
	{.block_size = sz, .count = cnt, .free_count = cnt, .block = hdr}

/* Heap blocks for modules */
//static struct block_hdr mod_block8[HEAP_RT_COUNT8];
static struct block_hdr mod_block16[HEAP_RT_COUNT16];
static struct block_hdr mod_block32[HEAP_RT_COUNT32];
static struct block_hdr mod_block64[HEAP_RT_COUNT64];
static struct block_hdr mod_block128[HEAP_RT_COUNT128];
static struct block_hdr mod_block256[HEAP_RT_COUNT256];
static struct block_hdr mod_block512[HEAP_RT_COUNT512];
static struct block_hdr mod_block1024[HEAP_RT_COUNT1024];

/* Heap memory map for modules */
static struct block_map rt_heap_map[] = {
/*	BLOCK_DEF(8, HEAP_RT_COUNT8, mod_block8), */
	BLOCK_DEF(16, HEAP_RT_COUNT16, mod_block16),
	BLOCK_DEF(32, HEAP_RT_COUNT32, mod_block32),
	BLOCK_DEF(64, HEAP_RT_COUNT64, mod_block64),
	BLOCK_DEF(128, HEAP_RT_COUNT128, mod_block128),
	BLOCK_DEF(256, HEAP_RT_COUNT256, mod_block256),
	BLOCK_DEF(512, HEAP_RT_COUNT512, mod_block512),
	BLOCK_DEF(1024, HEAP_RT_COUNT1024, mod_block1024),
};

/* Heap blocks for buffers */
static struct block_hdr buf_block[HEAP_BUFFER_COUNT];

/* Heap memory map for buffers */
static struct block_map buf_heap_map[] = {
	BLOCK_DEF(HEAP_BUFFER_BLOCK_SIZE, HEAP_BUFFER_COUNT, buf_block),
};

#if (HEAP_DMA_BUFFER_SIZE > 0)
/* Heap memory map for DMA buffers - only used for HW with special DMA memories */
static struct block_map dma_buf_heap_map[] = {
	BLOCK_DEF(HEAP_DMA_BUFFER_BLOCK_SIZE, HEAP_DMA_BUFFER_COUNT, buf_block),
};
#endif

struct mm_heap {
	uint32_t blocks;
	struct block_map *map;
	uint32_t heap;
	uint32_t size;
	struct mm_info info;
};

/* heap block memory map */
struct mm {
	struct mm_heap runtime;	/* general heap for components */
	struct mm_heap system;	/* system heap - used during init cannot be freed */
	struct mm_heap buffer;	/* general component buffer heap */
#if (HEAP_DMA_BUFFER_SIZE > 0)
	struct mm_heap dma;	/* general component DMA buffer heap */
#endif
	struct mm_info total;
	spinlock_t lock;	/* all allocs and frees are atomic */
};

struct mm memmap = {
	.system = {
		.heap = HEAP_SYSTEM_BASE,
		.size = HEAP_SYSTEM_SIZE,
		.info = {.free = HEAP_SYSTEM_SIZE,},
	},

	.runtime = {
		.blocks = ARRAY_SIZE(rt_heap_map),
		.map = rt_heap_map,
		.heap = HEAP_RUNTIME_BASE,
		.size = HEAP_RUNTIME_SIZE,
		.info = {.free = HEAP_RUNTIME_SIZE,},
	},

	.buffer = {
		.blocks = ARRAY_SIZE(buf_heap_map),
		.map = buf_heap_map,
		.heap = HEAP_BUFFER_BASE,
		.size = HEAP_BUFFER_SIZE,
		.info = {.free = HEAP_BUFFER_SIZE,},
	},

#if (HEAP_DMA_BUFFER_SIZE > 0)
	.dma = {
		.blocks = ARRAY_SIZE(dma_buf_heap_map),
		.map = dma_buf_heap_map,
		.heap = HEAP_DMA_BUFFER_BASE,
		.size = HEAP_DMA_BUFFER_SIZE,
		.info = {.free = HEAP_DMA_BUFFER_SIZE,},
	},
#endif
	.total = {.free = HEAP_SYSTEM_SIZE + HEAP_RUNTIME_SIZE + 
		HEAP_BUFFER_SIZE + HEAP_DMA_BUFFER_SIZE,},
};

/* total size of block */
static inline uint32_t block_get_size(struct block_map *map)
{
	return sizeof(*map) + map->count *
		(map->block_size + sizeof(struct block_hdr));
}

/* total size of heap */
static inline uint32_t heap_get_size(struct mm_heap *heap)
{
	uint32_t size = sizeof(struct mm_heap);
	int i;

	for (i = 0; i < heap->blocks; i++) {
		size += block_get_size(&heap->map[i]);
	}

	return size;
}

#if DEBUG_BLOCK_ALLOC || DEBUG_BLOCK_FREE
static void alloc_memset_region(void *ptr, uint32_t bytes, uint32_t val)
{
	uint32_t count = bytes >> 2;
	uint32_t *dest = ptr, i;

	for (i = 0; i < count; i++)
		dest[i] = val;
}
#endif

/* allocate from system memory pool */
static void *rmalloc_sys(size_t bytes)
{
	void *ptr = (void *)memmap.system.heap;

	/* always succeeds or panics */
	memmap.system.heap += bytes;
	if (memmap.system.heap >= HEAP_SYSTEM_BASE + HEAP_SYSTEM_SIZE) {
		trace_mem_error("eMd");
		panic(PANIC_MEM);
	}

#if DEBUG_BLOCK_ALLOC
	alloc_memset_region(ptr, bytes, DEBUG_BLOCK_ALLOC_VALUE);
#endif

	return ptr;
}

/* allocate single block */
static void *alloc_block(struct mm_heap *heap, int level, int bflags)
{
	struct block_map *map = &heap->map[level];
	struct block_hdr *hdr = &map->block[map->first_free];
	void *ptr;
	int i;

	map->free_count--;
	ptr = (void *)(map->base + map->first_free * map->block_size);
	hdr->size = 1;
	hdr->flags = RFLAGS_USED | bflags;
	heap->info.used += map->block_size;
	heap->info.free -= map->block_size;

	/* find next free */
	for (i = map->first_free; i < map->count; ++i) {

		hdr = &map->block[i];

		if (hdr->flags == 0) {
			map->first_free = i;
			break;
		}
	}

#if DEBUG_BLOCK_ALLOC
	alloc_memset_region(ptr, map->block_size, DEBUG_BLOCK_ALLOC_VALUE);
#endif

	return ptr;
}

/* allocates continuous blocks */
static void *alloc_cont_blocks(struct mm_heap *heap, int level, int bflags,
	size_t bytes)
{
	struct block_map *map = &heap->map[level];
	struct block_hdr *hdr = &map->block[map->first_free];
	void *ptr;
	unsigned int start;
	unsigned int current;
	unsigned int count = bytes / map->block_size;
	unsigned int i;
	unsigned int remaining = map->count - count;
	unsigned int end;

	if (bytes % map->block_size)
		count++;

	/* check for continuous blocks from "start" */
	for (start = map->first_free; start < remaining; start++) {

		/* check that we have enough free blocks from start pos */
		end = start + count;
		for (current = start; current < end; current++) {
			hdr = &map->block[current];

			/* is block used */
			if (hdr->flags == RFLAGS_USED)
				break;
		}

		/* enough free blocks ? */
		if (current == end)
			goto found;
	}

	/* not found */
	trace_mem_error("eCb");
	return NULL;

found:
	/* found some free blocks */
	map->free_count -= count;
	ptr = (void *)(map->base + start * map->block_size);
	hdr = &map->block[start];
	hdr->size = count;
	heap->info.used += count * map->block_size;
	heap->info.free -= count * map->block_size;

	/* allocate each block */
	for (current = start; current < end; current++) {
		hdr = &map->block[current];
		hdr->flags = RFLAGS_USED | bflags;
	}

	/* do we need to find a new first free block ? */
	if (start == map->first_free) {

		/* find next free */
		for (i = map->first_free + count; i < map->count; ++i) {

			hdr = &map->block[i];

			if (hdr->flags == 0) {
				map->first_free = i;
				break;
			}
		}
	}

#if DEBUG_BLOCK_ALLOC
	alloc_memset_region(ptr, bytes, DEBUG_BLOCK_ALLOC_VALUE);
#endif

	return ptr;
}

/* free block(s) */
static void free_block(struct mm_heap *heap, void *ptr)
{
	struct mm_heap * mm_heap;
	struct block_map * block_map;
	struct block_hdr *hdr;
	int i;
	int block;
	int array_size;

	/* sanity check */
	if (ptr == NULL)
		return;

	/* find mm_heap that ptr belongs to */
	if ((uint32_t)ptr >= memmap.runtime.heap &&
		(uint32_t)ptr < memmap.runtime.heap + memmap.runtime.size) {
		mm_heap = &memmap.runtime;
		array_size = ARRAY_SIZE(rt_heap_map);
	} else if ((uint32_t)ptr >= memmap.buffer.heap &&
		(uint32_t)ptr < memmap.buffer.heap + memmap.buffer.size) {
		mm_heap = &memmap.buffer;
		array_size = ARRAY_SIZE(buf_heap_map);
#if (HEAP_DMA_BUFFER_SIZE > 0)
	} else if ((uint32_t)ptr >= memmap.dma.heap &&
		(uint32_t)ptr < memmap.dma.heap + memmap.dma.size) {
		mm_heap = &memmap.dma;
		array_size = ARRAY_SIZE(dma_buf_heap_map);
#endif
	} else
		return;

	/* find block that ptr belongs to */
	for (i = 0; i < array_size - 1; i ++) {

		/* is ptr in this block */
		if ((uint32_t)ptr < mm_heap->map[i + 1].base)
			goto found;
	}

	/* not found */
	trace_mem_error("eMF");
	return;

found:
	/* the block i is it */
	block_map = &mm_heap->map[i];

	/* calculate block header */
	block = ((uint32_t)ptr - block_map->base) / block_map->block_size;
	hdr = &block_map->block[block];

	/* free block header and continuous blocks */
	for (i = block; i < block + hdr->size; i++) {
		hdr = &block_map->block[i];
		hdr->size = 0;
		hdr->flags = 0;
		block_map->free_count++;
		heap->info.used -= block_map->block_size;
		heap->info.free += block_map->block_size;
	}

	/* set first free */
	if (block < block_map->first_free)
		block_map->first_free = block;

#if DEBUG_BLOCK_FREE
	alloc_memset_region(ptr, block_map->block_size * (i - 1), DEBUG_BLOCK_FREE_VALUE);
#endif
}

/* allocate single block for runtime */
static void *rmalloc_runtime(int bflags, size_t bytes)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(rt_heap_map); i ++) {

		/* is block big enough */
		if (rt_heap_map[i].block_size < bytes)
			continue;

		/* does block have free space */
		if (rt_heap_map[i].free_count == 0)
			continue;

		/* free block space exists */
		return alloc_block(&memmap.runtime, i, bflags);
	}

	trace_mem_error("eMm");
	trace_value(bytes);
	trace_value(bflags);
	return NULL;
}

void *rmalloc(int zone, int bflags, size_t bytes)
{
	uint32_t flags;
	void *ptr = NULL;

	spin_lock_irq(&memmap.lock, flags);

	switch (zone) {
	case RZONE_SYS:
		ptr = rmalloc_sys(bytes);
		break;
	case RZONE_RUNTIME:
		ptr = rmalloc_runtime(bflags, bytes);
		break;
	default:
		trace_mem_error("eMz");
		break;
	}

	spin_unlock_irq(&memmap.lock, flags);
	return ptr;
}

void *rzalloc(int zone, int bflags, size_t bytes)
{
	void *ptr = NULL;

	ptr = rmalloc(zone, bflags, bytes);
	if (ptr != NULL) {
		bzero(ptr, bytes);
	}

	return ptr;
}

/* allocates continuous buffer on 1k boundary */
void *rballoc(int zone, int bflags, size_t bytes)
{
	struct block_map * block_map = buf_heap_map;
	struct mm_heap * mm_heap = &memmap.buffer;
	int i;
	int array_size = ARRAY_SIZE(buf_heap_map);
	uint32_t flags;
	void *ptr = NULL;

#if (HEAP_DMA_BUFFER_SIZE > 0)
	if (bflags & RFLAGS_DMA) {
		mm_heap = &memmap.dma;
		block_map = dma_buf_heap_map;
		array_size = ARRAY_SIZE(dma_buf_heap_map);
	}
#endif
	spin_lock_irq(&memmap.lock, flags);

	/* will request fit in single block */
	for (i = 0; i < array_size; i++) {

		/* is block big enough */
		if (block_map[i].block_size < bytes)
			continue;

		/* does block have free space */
		if (block_map[i].free_count == 0)
			continue;

		/* allocate block */
		ptr = alloc_block(mm_heap, i, bflags);
		goto out;
	}

	/* request spans > 1 block */

	/* only 1 choice for block size */
	if (array_size == 1) {
		ptr = alloc_cont_blocks(mm_heap, 0, bflags, bytes);
		goto out;
	} else {

		/* find best block size for request */
		for (i = 0; i < array_size; i++) {

			/* allocate is block size smaller than request */
			if (block_map[i].block_size < bytes)
				alloc_cont_blocks(mm_heap, i, bflags,
					bytes);
		}
	}

	ptr = alloc_cont_blocks(mm_heap, array_size - 1,
		bflags, bytes);

out:
	spin_unlock_irq(&memmap.lock, flags);
	return ptr;
}

void rfree(void *ptr)
{
	uint32_t flags;

	spin_lock_irq(&memmap.lock, flags);
	free_block(&memmap.runtime, ptr);
	spin_unlock_irq(&memmap.lock, flags);
}

void rbfree(void *ptr)
{
	uint32_t flags;

	spin_lock_irq(&memmap.lock, flags);
	free_block(&memmap.buffer, ptr);
	spin_unlock_irq(&memmap.lock, flags);
}

uint32_t mm_pm_context_size(void)
{
	uint32_t size;

	/* calc context size for each area  */
	size = memmap.buffer.info.used;
	size += memmap.runtime.info.used;
	size += memmap.system.info.used;

	/* add memory maps */
	size += heap_get_size(&memmap.buffer);
	size += heap_get_size(&memmap.runtime);
	size += heap_get_size(&memmap.system);

	/* recalc totals */
	memmap.total.free = memmap.buffer.info.free +
		memmap.runtime.info.free + memmap.system.info.free;
	memmap.total.used = memmap.buffer.info.used +
		memmap.runtime.info.used + memmap.system.info.used;

	return size;
}

/*
 * Save the DSP memories that are in use the system and modules. All pipeline and modules
 * must be disabled before calling this functions. No allocations are permitted after
 * calling this and before calling restore.
 */
int mm_pm_context_save(struct dma_copy *dc, struct dma_sg_config *sg)
{
	uint32_t used;
	int32_t offset = 0;
	int32_t ret;

	/* first make sure SG buffer has enough space on host for DSP context */
	used = mm_pm_context_size();
	if (used > dma_sg_get_size(sg))
		return -EINVAL;

	/* copy memory maps to SG */
	ret = dma_copy_to_host(dc, sg, offset,
		(void *)&memmap, sizeof(memmap));
	if (ret < 0)
		return ret;

	/* copy system memory contents to SG */
	ret = dma_copy_to_host(dc, sg, offset + ret,
		(void *)memmap.system.heap, (int32_t)(memmap.system.size));
	if (ret < 0)
		return ret;

	/* copy module memory contents to SG */
	// TODO: iterate over module block map and copy contents of each block
	// to the host.

	/* copy buffer memory contents to SG */
	// TODO: iterate over buffer block map and copy contents of each block
	// to the host.

	return ret;
}

/*
 * Restore the DSP memories to modules and the system. This must be called immediately
 * after booting before any pipeline work.
 */
int mm_pm_context_restore(struct dma_copy *dc, struct dma_sg_config *sg)
{
	int32_t offset = 0;
	int32_t ret;

	/* copy memory maps from SG */
	ret = dma_copy_from_host(dc, sg, offset,
		(void *)&memmap, sizeof(memmap));
	if (ret < 0)
		return ret;

	/* copy system memory contents from SG */
	ret = dma_copy_to_host(dc, sg, offset + ret,
		(void *)memmap.system.heap, (int32_t)(memmap.system.size));
	if (ret < 0)
		return ret;

	/* copy module memory contents from SG */
	// TODO: iterate over module block map and copy contents of each block
	// to the host. This is the same block order used by the context store

	/* copy buffer memory contents from SG */
	// TODO: iterate over buffer block map and copy contents of each block
	// to the host. This is the same block order used by the context store

	return 0;
}

/* initialise map */
void init_heap(struct reef *reef)
{
	struct block_map *next_map;
	struct block_map *current_map;
	int i;

	spinlock_init(&memmap.lock);

	/* initialise buffer map */
	current_map = &buf_heap_map[0];
	current_map->base = memmap.buffer.heap;

	for (i = 1; i < ARRAY_SIZE(buf_heap_map); i++) {
		next_map = &buf_heap_map[i];
		next_map->base = current_map->base +
			current_map->block_size * current_map->count;
		current_map = &buf_heap_map[i];
	}

	/* initialise runtime map */
	current_map = &rt_heap_map[0];
	current_map->base = memmap.runtime.heap;

	for (i = 1; i < ARRAY_SIZE(rt_heap_map); i++) {
		next_map = &rt_heap_map[i];
		next_map->base = current_map->base +
			current_map->block_size * current_map->count;
		current_map = &rt_heap_map[i];
	}

#if (HEAP_DMA_BUFFER_SIZE > 0)
	/* initialise DMA map */
	current_map = &dma_buf_heap_map[0];
	current_map->base = memmap.dma.heap;

	for (i = 1; i < ARRAY_SIZE(dma_buf_heap_map); i++) {
		next_map = &dma_buf_heap_map[i];
		next_map->base = current_map->base +
			current_map->block_size * current_map->count;
		current_map = &dma_buf_heap_map[i];
	}
#endif
}