iCE40/yosys - clone of https://github.com/YosysHQ/yosys

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/******************************************************************************
 * tmem_xen.h
 *
 * Xen-specific Transcendent memory
 *
 * Copyright (c) 2009, Dan Magenheimer, Oracle Corp.
 */

#ifndef __XEN_TMEM_XEN_H__
#define __XEN_TMEM_XEN_H__

#include <xen/mm.h> /* heap alloc/free */
#include <xen/pfn.h>
#include <xen/xmalloc.h> /* xmalloc/xfree */
#include <xen/sched.h>  /* struct domain */
#include <xen/guest_access.h> /* copy_from_guest */
#include <xen/hash.h> /* hash_long */
#include <xen/domain_page.h> /* __map_domain_page */
#include <xsm/xsm.h> /* xsm_tmem_control */
#include <public/tmem.h>
#ifdef CONFIG_COMPAT
#include <compat/tmem.h>
#endif

struct tmem_host_dependent_client {
    struct domain *domain;
    struct xmem_pool *persistent_pool;
};
typedef struct tmem_host_dependent_client tmh_client_t;

typedef uint32_t pagesize_t;  /* like size_t, must handle largest PAGE_SIZE */

#define IS_PAGE_ALIGNED(addr) \
  ((void *)((((unsigned long)addr + (PAGE_SIZE - 1)) & PAGE_MASK)) == addr)
#define IS_VALID_PAGE(_pi)  ( mfn_valid(page_to_mfn(_pi)) )

extern struct xmem_pool *tmh_mempool;
extern unsigned int tmh_mempool_maxalloc;
extern struct page_list_head tmh_page_list;
extern spinlock_t tmh_page_list_lock;
extern unsigned long tmh_page_list_pages;
extern atomic_t freeable_page_count;

extern spinlock_t tmem_lock;
extern spinlock_t tmem_spinlock;
extern rwlock_t tmem_rwlock;

extern void tmh_copy_page(char *to, char*from);
extern int tmh_init(void);
#define tmh_hash hash_long

extern void tmh_release_avail_pages_to_host(void);
extern void tmh_scrub_page(struct page_info *pi, unsigned int memflags);

extern bool_t opt_tmem_compress;
static inline bool_t tmh_compression_enabled(void)
{
    return opt_tmem_compress;
}

extern bool_t opt_tmem_dedup;
static inline bool_t tmh_dedup_enabled(void)
{
    return opt_tmem_dedup;
}

extern bool_t opt_tmem_tze;
static inline bool_t tmh_tze_enabled(void)
{
    return opt_tmem_tze;
}

static inline void tmh_tze_disable(void)
{
    opt_tmem_tze = 0;
}

extern bool_t opt_tmem_shared_auth;
static inline bool_t tmh_shared_auth(void)
{
    return opt_tmem_shared_auth;
}

extern bool_t opt_tmem;
static inline bool_t tmh_enabled(void)
{
    return opt_tmem;
}

extern int opt_tmem_lock;

/*
 * Memory free page list management
 */

static inline struct page_info *tmh_page_list_get(void)
{
    struct page_info *pi;

    spin_lock(&tmh_page_list_lock);
    if ( (pi = page_list_remove_head(&tmh_page_list)) != NULL )
        tmh_page_list_pages--;
    spin_unlock(&tmh_page_list_lock);
    ASSERT((pi == NULL) || IS_VALID_PAGE(pi));
    return pi;
}

static inline void tmh_page_list_put(struct page_info *pi)
{
    ASSERT(IS_VALID_PAGE(pi));
    spin_lock(&tmh_page_list_lock);
    page_list_add(pi, &tmh_page_list);
    tmh_page_list_pages++;
    spin_unlock(&tmh_page_list_lock);
}

static inline unsigned long tmh_avail_pages(void)
{
    return tmh_page_list_pages;
}

/*
 * Memory allocation for persistent data 
 */

static inline bool_t domain_fully_allocated(struct domain *d)
{
    return ( d->tot_pages >= d->max_pages );
}
#define tmh_client_memory_fully_allocated(_pool) \
 domain_fully_allocated(_pool->client->tmh->domain)

static inline void *_tmh_alloc_subpage_thispool(struct xmem_pool *cmem_mempool,
                                                 size_t size, size_t align)
{
#if 0
    if ( d->tot_pages >= d->max_pages )
        return NULL;
#endif
    ASSERT( size < tmh_mempool_maxalloc );
    if ( cmem_mempool == NULL )
        return NULL;
    return xmem_pool_alloc(size, cmem_mempool);
}
#define tmh_alloc_subpage_thispool(_pool, _s, _a) \
            _tmh_alloc_subpage_thispool(pool->client->tmh->persistent_pool, \
                                         _s, _a)

static inline void _tmh_free_subpage_thispool(struct xmem_pool *cmem_mempool,
                                               void *ptr, size_t size)
{
    ASSERT( size < tmh_mempool_maxalloc );
    ASSERT( cmem_mempool != NULL );
    xmem_pool_free(ptr,cmem_mempool);
}
#define tmh_free_subpage_thispool(_pool, _p, _s) \
 _tmh_free_subpage_thispool(_pool->client->tmh->persistent_pool, _p, _s)

static inline struct page_info *_tmh_alloc_page_thispool(struct domain *d)
{
    struct page_info *pi;

    /* note that this tot_pages check is not protected by d->page_alloc_lock,
     * so may race and periodically fail in donate_page or alloc_domheap_pages
     * That's OK... neither is a problem, though chatty if log_lvl is set */ 
    if ( d->tot_pages >= d->max_pages )
        return NULL;

    if ( tmh_page_list_pages )
    {
        if ( (pi = tmh_page_list_get()) != NULL )
        {
            if ( donate_page(d,pi,0) == 0 )
                goto out;
            else
                tmh_page_list_put(pi);
        }
    }

    pi = alloc_domheap_pages(d,0,MEMF_tmem);

out:
    ASSERT((pi == NULL) || IS_VALID_PAGE(pi));
    return pi;
}
#define tmh_alloc_page_thispool(_pool) \
    _tmh_alloc_page_thispool(_pool->client->tmh->domain)

static inline void _tmh_free_page_thispool(struct page_info *pi)
{
    struct domain *d = page_get_owner(pi);

    ASSERT(IS_VALID_PAGE(pi));
    if ( (d == NULL) || steal_page(d,pi,0) == 0 )
        tmh_page_list_put(pi);
    else
    {
        scrub_one_page(pi);
        ASSERT((pi->count_info & ~(PGC_allocated | 1)) == 0);
        free_domheap_pages(pi,0);
    }
}
#define tmh_free_page_thispool(_pool,_pg) \
    _tmh_free_page_thispool(_pg)

/*
 * Memory allocation for ephemeral (non-persistent) data
 */

static inline void *tmh_alloc_subpage(void *pool, size_t size,
                                                 size_t align)
{
    ASSERT( size < tmh_mempool_maxalloc );
    ASSERT( tmh_mempool != NULL );
    return xmem_pool_alloc(size, tmh_mempool);
}

static inline void tmh_free_subpage(void *ptr, size_t size)
{
    ASSERT( size < tmh_mempool_maxalloc );
    xmem_pool_free(ptr,tmh_mempool);
}

static inline struct page_info *tmh_alloc_page(void *pool, int no_heap)
{
    struct page_info *pi = tmh_page_list_get();

    if ( pi == NULL && !no_heap )
        pi = alloc_domheap_pages(0,0,MEMF_tmem);
    ASSERT((pi == NULL) || IS_VALID_PAGE(pi));
    if ( pi != NULL && !no_heap )
        atomic_inc(&freeable_page_count);
    return pi;
}

static inline void tmh_free_page(struct page_info *pi)
{
    ASSERT(IS_VALID_PAGE(pi));
    tmh_page_list_put(pi);
    atomic_dec(&freeable_page_count);
}

static inline unsigned int tmem_subpage_maxsize(void)
{
    return tmh_mempool_maxalloc;
}

static inline unsigned long tmh_freeable_pages(void)
{
    return tmh_avail_pages() + _atomic_read(freeable_page_count);
}

static inline unsigned long tmh_free_mb(void)
{
    return (tmh_avail_pages() + total_free_pages()) >> (20 - PAGE_SHIFT);
}

/*
 * Memory allocation for "infrastructure" data
 */

static inline void *tmh_alloc_infra(size_t size, size_t align)
{
    return _xmalloc(size,align);
}

static inline void tmh_free_infra(void *p)


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