77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
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#ifndef _LINUX_RBIN_REGION_H
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#define _LINUX_RBIN_REGION_H
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#include <linux/atomic.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/genalloc.h>
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#include <linux/highmem.h>
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#define E_NOREGION 55 // returned when region is disabled
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struct rr_handle {
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int pool_id; /* Pool index : corresponds to filesystem */
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int rb_index; /* Redblack tree index: value equals inode number */
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int ra_index; /* Radix tree index : value equals page->index */
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int usage; /* indicates current usage of corresponding page */
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struct list_head lru; /* use lru of struct page instead */
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};
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enum usage {
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RC_FREED,
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RC_INUSE,
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ION_FREED,
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ION_INUSE,
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};
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struct region_ops {
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void (*evict)(unsigned long handle);
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};
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struct rbin_region {
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struct zone *zone;
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unsigned long start_pfn;
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unsigned long end_pfn;
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struct rr_handle *handles;
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struct list_head freelist; /* protected by lru_lock. handle->lru */
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struct list_head usedlist; /* protected by lru_lock. handle->lru */
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const struct region_ops *ops;
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spinlock_t lru_lock;
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spinlock_t region_lock;
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struct gen_pool *pool;
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int ion_inflight;
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int rc_inflight;
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bool rc_disabled;
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unsigned long timeout; /* timeout for rbincache enable */
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};
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/* rbin region api's */
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#define ZERO_HANDLE ((void *)~(~0UL >> 1))
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struct rr_handle *region_store_cache(struct page *page, int pool_id,
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int rb_index, int ra_index);
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int region_load_cache(struct rr_handle *handle, struct page *page,
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int pool_id, int rb_index, int ra_index);
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int region_flush_cache(struct rr_handle *handle);
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bool try_get_rbincache(void);
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void put_rbincache(void);
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void init_region(unsigned long pfn, unsigned long nr_pages,
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const struct region_ops *ops);
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/* rbin region api's end */
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/* helper function declaration */
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struct rr_handle *pfn_to_handle(unsigned long pfn);
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struct rr_handle *page_to_handle(struct page *page);
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struct page *handle_to_page(struct rr_handle *handle);
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bool handle_is_valid(struct rr_handle *handle);
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/* helper function declaration end */
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/* ion_rbin_heap apis */
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phys_addr_t ion_rbin_allocate(unsigned long size);
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void ion_rbin_free(phys_addr_t addr, unsigned long size);
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int init_rbinregion(unsigned long base, unsigned long size);
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/* ion_rbin_heap apis end */
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#endif /* _LINUX_RBIN_REGION_H*/
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