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/******************************************************************************
**  FILE        : tpm_mempool.c                                              **
**                                                                           **
**  DESCRIPTION : This file tpm memory pool manager                          **
******************************************************************************/
#include <linux/slab.h>
#include "tpm_mempool.h"

bool tpm_common_mempool_check_internal(tpm_common_mempool_t *pool,
				       void *ptr,
				       tpm_common_mpool_hdr_t *hdr,
				       tpm_common_mpool_ftr_t *ftr)
{
	if (!ptr) {
		printk(KERN_ERR "illegal ptr NULL");
		return false;
	}

	if (!TPM_COMMON_MPOOL_CHECK_ALIGNED4(ptr)) {
		printk(KERN_ERR "ptr not aligned %p", ptr);
		return false;
	}

	if (hdr->magic != TPM_COMMON_MPOOL_HDR_MAGIC) {
		printk(KERN_ERR "illegal hdr magic %x for ptr %p", hdr->magic, ptr);
		return false;
	}

	if (ftr->magic != TPM_COMMON_MPOOL_FTR_MAGIC) {
		printk(KERN_ERR "illegal ftr magic %x for ptr %p", ftr->magic, ptr);
		return false;
	}

	if (hdr->pool != pool || ftr->pool != pool) {
		printk(KERN_ERR "inconsistent size hdr->pool: %p ftr->pool: %p for ptr %p", hdr->pool, ftr->pool, ptr);
		return false;
	}

	if (!(hdr->flags & TPM_COMMON_MPOOL_HDR_FLAGS_ALLOCATED)) {
		printk(KERN_ERR "ptr %p was not allocated", ptr);
		return false;
	}
	return true;
}

void *tpm_common_mempool_alloc(tpm_common_mempool_t * pool)
{
	tpm_common_mpool_hdr_t *hdr;

	if (!pool || !pool->head || pool->number_of_free_entries == 0)
		return NULL;

	spin_lock_bh(&pool->lock);
	hdr = pool->head;
	pool->head = pool->head->next;

	if (!pool->head)
		pool->tail = NULL;

	hdr->flags = TPM_COMMON_MPOOL_HDR_FLAGS_ALLOCATED;
	pool->number_of_free_entries--;
	spin_unlock_bh(&pool->lock);
	return ((uint8_t *) hdr + sizeof(tpm_common_mpool_hdr_t));
}

void tpm_common_mempool_free(tpm_common_mempool_t *pool, void *ptr)
{
	tpm_common_mpool_hdr_t *hdr;
	tpm_common_mpool_ftr_t *ftr;

	if (!pool || !ptr)
		return;

	if (!TPM_COMMON_MPOOL_CHECK_ALIGNED4(ptr)) {
		printk(KERN_ERR "ptr not aligned %p", ptr);
		return;
	}
	spin_lock_bh(&pool->lock);
	hdr = (tpm_common_mpool_hdr_t *) ((uint8_t *) ptr - sizeof(tpm_common_mpool_hdr_t));
	ftr = (tpm_common_mpool_ftr_t *) ((uint8_t *) ptr + pool->data_size);

	if (!tpm_common_mempool_check_internal(pool, ptr, hdr, ftr)) {
		printk(KERN_ERR "invalid ptr %p", ptr);
		spin_unlock_bh(&pool->lock);
		return;
	}

	hdr->flags ^= TPM_COMMON_MPOOL_HDR_FLAGS_ALLOCATED;
	hdr->next = NULL;

	if (!pool->head)
		pool->head = pool->tail = hdr;
	else {
		pool->tail->next = hdr;
		pool->tail = hdr;
	}

	pool->number_of_free_entries++;
	spin_unlock_bh(&pool->lock);
}

tpm_common_mempool_t *tpm_common_mempool_create(uint32_t number_of_entries,
						uint32_t entry_size,
						int32_t priority)
{
	uint32_t i;
	uint32_t aligned_entry_size;
	uint32_t pool_entry_size;
	tpm_common_mpool_hdr_t *hdr;
	tpm_common_mpool_hdr_t *next_hdr;
	tpm_common_mpool_ftr_t *ftr;
	tpm_common_mempool_t *pool;

	aligned_entry_size = TPM_COMMON_MPOOL_ALIGN4(entry_size);
	pool_entry_size =
	    TPM_COMMON_MPOOL_ALIGN4(sizeof(tpm_common_mpool_hdr_t) + aligned_entry_size +
				    sizeof(tpm_common_mpool_ftr_t));
	pool = kmalloc((sizeof(tpm_common_mempool_t) + pool_entry_size * number_of_entries), priority);

	if (!pool)
		return NULL;

	pool->entry_size = entry_size;
	pool->number_of_entries = number_of_entries;
	pool->data_size = aligned_entry_size;
	pool->pool_entry_size = pool_entry_size;
	pool->number_of_free_entries = number_of_entries;
	pool->mem = (uint8_t *) (pool + 1);
	pool->head = (tpm_common_mpool_hdr_t *) pool->mem;
	spin_lock_init(&pool->lock);

	for (i = 0; i < number_of_entries; i++) {
		hdr = (tpm_common_mpool_hdr_t *) &pool->mem[pool_entry_size * i];
		ftr =
		    (tpm_common_mpool_ftr_t *) ((uint8_t *) hdr + sizeof(tpm_common_mpool_hdr_t) + aligned_entry_size);
		hdr->magic = TPM_COMMON_MPOOL_HDR_MAGIC;
		hdr->pool = pool;
		hdr->flags = 0;
		ftr->magic = TPM_COMMON_MPOOL_FTR_MAGIC;
		ftr->pool = pool;

		if (i < (number_of_entries - 1))
			next_hdr = (tpm_common_mpool_hdr_t *) &pool->mem[pool_entry_size * (i + 1)];
		else {
			pool->tail = hdr;
			next_hdr = NULL;
		}

		hdr->next = next_hdr;
	}
	return pool;
}

void tpm_common_mempool_destroy(tpm_common_mempool_t *pool)
{
	if (!pool)
		return;

	kfree(pool);
}

int32_t tpm_common_mempool_get_number_of_free_entries(tpm_common_mempool_t *pool)
{
	if (!pool)
		return -1;

	return (int32_t) pool->number_of_free_entries;
}

int32_t tpm_common_mempool_get_number_of_entries(tpm_common_mempool_t *pool)
{
	if (!pool)
		return -1;

	return (int32_t) pool->number_of_entries;
}

int32_t tpm_common_mempool_get_entry_size(tpm_common_mempool_t *pool)
{
	if (!pool)
		return -1;

	return (int32_t) pool->entry_size;
}

tpm_common_mempool_t *tpm_common_mempool_get(void *ptr)
{
	tpm_common_mpool_hdr_t *hdr;
	tpm_common_mpool_ftr_t *ftr;

	if (!ptr)
		return NULL;

	if (!TPM_COMMON_MPOOL_CHECK_ALIGNED4(ptr))
		return NULL;

	hdr = (tpm_common_mpool_hdr_t *) ((uint8_t *) ptr - sizeof(tpm_common_mpool_hdr_t));

	if (!hdr)
		return NULL;

	ftr = (tpm_common_mpool_ftr_t *) ((uint8_t *) ptr + hdr->pool->data_size);

	if (hdr->magic != TPM_COMMON_MPOOL_HDR_MAGIC) {
		printk(KERN_ERR "illegal hdr magic %x for ptr %p", hdr->magic, ptr);
		return NULL;
	}
	if (ftr->magic != TPM_COMMON_MPOOL_FTR_MAGIC) {
		printk(KERN_ERR "illegal ftr magic %x for ptr %p", ftr->magic, ptr);
		return NULL;
	}
	if ((!hdr->pool) || (hdr->pool != ftr->pool)) {
		printk(KERN_ERR "inconsistent size hdr->pool: %p ftr->pool: %p for ptr %p", hdr->pool, ftr->pool, ptr);
		return false;
	}
	return hdr->pool;
}