include/linux/android_pmem.h

/* include/linux/android_pmem.h
 *
 * Copyright (C) 2007 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#ifndef _ANDROID_PMEM_H_
#define _ANDROID_PMEM_H_

#include <linux/fs.h>

#define PMEM_KERNEL_TEST_MAGIC 0xc0
#define PMEM_KERNEL_TEST_NOMINAL_TEST_IOCTL \
	_IO(PMEM_KERNEL_TEST_MAGIC, 1)
#define PMEM_KERNEL_TEST_ADVERSARIAL_TEST_IOCTL \
	_IO(PMEM_KERNEL_TEST_MAGIC, 2)
#define PMEM_KERNEL_TEST_HUGE_ALLOCATION_TEST_IOCTL \
	_IO(PMEM_KERNEL_TEST_MAGIC, 3)
#define PMEM_KERNEL_TEST_FREE_UNALLOCATED_TEST_IOCTL \
	_IO(PMEM_KERNEL_TEST_MAGIC, 4)
#define PMEM_KERNEL_TEST_LARGE_REGION_NUMBER_TEST_IOCTL \
	_IO(PMEM_KERNEL_TEST_MAGIC, 5)

#define PMEM_IOCTL_MAGIC 'p'
#define PMEM_GET_PHYS		_IOW(PMEM_IOCTL_MAGIC, 1, unsigned int)
#define PMEM_MAP		_IOW(PMEM_IOCTL_MAGIC, 2, unsigned int)
#define PMEM_GET_SIZE		_IOW(PMEM_IOCTL_MAGIC, 3, unsigned int)
#define PMEM_UNMAP		_IOW(PMEM_IOCTL_MAGIC, 4, unsigned int)
/* This ioctl will allocate pmem space, backing the file, it will fail
 * if the file already has an allocation, pass it the len as the argument
 * to the ioctl */
#define PMEM_ALLOCATE		_IOW(PMEM_IOCTL_MAGIC, 5, unsigned int)
/* This will connect a one pmem file to another, pass the file that is already
 * backed in memory as the argument to the ioctl
 */
#define PMEM_CONNECT		_IOW(PMEM_IOCTL_MAGIC, 6, unsigned int)
/* Returns the total size of the pmem region it is sent to as a pmem_region
 * struct (with offset set to 0). 
 */
#define PMEM_GET_TOTAL_SIZE	_IOW(PMEM_IOCTL_MAGIC, 7, unsigned int)
/* Revokes gpu registers and resets the gpu.  Pass a pointer to the
 * start of the mapped gpu regs (the vaddr returned by mmap) as the argument.
 */
#define HW3D_REVOKE_GPU		_IOW(PMEM_IOCTL_MAGIC, 8, unsigned int)
#define HW3D_GRANT_GPU		_IOW(PMEM_IOCTL_MAGIC, 9, unsigned int)
#define HW3D_WAIT_FOR_INTERRUPT	_IOW(PMEM_IOCTL_MAGIC, 10, unsigned int)

#define PMEM_CLEAN_INV_CACHES	_IOW(PMEM_IOCTL_MAGIC, 11, unsigned int)
#define PMEM_CLEAN_CACHES	_IOW(PMEM_IOCTL_MAGIC, 12, unsigned int)
#define PMEM_INV_CACHES		_IOW(PMEM_IOCTL_MAGIC, 13, unsigned int)

#define PMEM_GET_FREE_SPACE	_IOW(PMEM_IOCTL_MAGIC, 14, unsigned int)
#define PMEM_ALLOCATE_ALIGNED	_IOW(PMEM_IOCTL_MAGIC, 15, unsigned int)
struct pmem_region {
	unsigned long offset;
	unsigned long len;
};

struct pmem_addr {
	unsigned long vaddr;
	unsigned long offset;
	unsigned long length;
};

struct pmem_freespace {
	unsigned long total;
	unsigned long largest;
};

struct pmem_allocation {
	unsigned long size;
	unsigned int align;
};

#ifdef __KERNEL__
int get_pmem_file(unsigned int fd, unsigned long *start, unsigned long *vstart,
		  unsigned long *end, struct file **filp);
int get_pmem_fd(int fd, unsigned long *start, unsigned long *end);
int get_pmem_user_addr(struct file *file, unsigned long *start,
		       unsigned long *end);
void put_pmem_file(struct file* file);
void put_pmem_fd(int fd);
void flush_pmem_fd(int fd, unsigned long start, unsigned long len);
void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);
int pmem_cache_maint(struct file *file, unsigned int cmd,
		struct pmem_addr *pmem_addr);

enum pmem_allocator_type {
	/* Zero is a default in platform PMEM structures in the board files,
	 * when the "allocator_type" structure element is not explicitly
	 * defined
	 */
	PMEM_ALLOCATORTYPE_BITMAP = 0, /* forced to be zero here */
	PMEM_ALLOCATORTYPE_SYSTEM,

	PMEM_ALLOCATORTYPE_ALLORNOTHING,
	PMEM_ALLOCATORTYPE_BUDDYBESTFIT,

	PMEM_ALLOCATORTYPE_MAX,
};

#define PMEM_MEMTYPE_MASK 0x7
#define PMEM_INVALID_MEMTYPE 0x0
#define PMEM_MEMTYPE_EBI1 0x1
#define PMEM_MEMTYPE_SMI  0x2
#define PMEM_MEMTYPE_RESERVED_INVALID2 0x3
#define PMEM_MEMTYPE_RESERVED_INVALID3 0x4
#define PMEM_MEMTYPE_RESERVED_INVALID4 0x5
#define PMEM_MEMTYPE_RESERVED_INVALID5 0x6
#define PMEM_MEMTYPE_RESERVED_INVALID6 0x7

#define PMEM_ALIGNMENT_MASK 0x18
#define PMEM_ALIGNMENT_RESERVED_INVALID1 0x0
#define PMEM_ALIGNMENT_4K 0x8 /* the default */
#define PMEM_ALIGNMENT_1M 0x10
#define PMEM_ALIGNMENT_RESERVED_INVALID2 0x18

/* flags in the following function defined as above. */
int32_t pmem_kalloc(const size_t size, const uint32_t flags);
int32_t pmem_kfree(const int32_t physaddr);

/* kernel api names for board specific data structures */
#define PMEM_KERNEL_EBI1_DATA_NAME "pmem_kernel_ebi1"
#define PMEM_KERNEL_SMI_DATA_NAME "pmem_kernel_smi"

struct android_pmem_platform_data
{
	const char* name;
	/* size of memory region */
	unsigned long size;

	enum pmem_allocator_type allocator_type;
	/* treated as a 'hidden' variable in the board files. Can be
	 * set, but default is the system init value of 0 which becomes a
	 * quantum of 4K pages.
	 */
	unsigned int quantum;

	/* set to indicate maps of this region should be cached, if a mix of
	 * cached and uncached is desired, set this and open the device with
	 * O_SYNC to get an uncached region */
	unsigned cached;
	/* The MSM7k has bits to enable a write buffer in the bus controller*/
	unsigned buffered;
	/* which memory type (i.e. SMI, EBI1) this PMEM device is backed by */
	unsigned memory_type;
	/*
	 * function to be called when the number of allocations goes from
	 * 0 -> 1
	 */
	void (*request_region)(void *);
	/*
	 * function to be called when the number of allocations goes from
	 * 1 -> 0
	 */
	void (*release_region)(void *);
	/*
	 * function to be called upon pmem registration
	 */
	void *(*setup_region)(void);
	/*
	 * indicates that this region should be mapped/unmaped as needed
	 */
	int map_on_demand;
};

int pmem_setup(struct android_pmem_platform_data *pdata,
	       long (*ioctl)(struct file *, unsigned int, unsigned long),
	       int (*release)(struct inode *, struct file *));

int pmem_remap(struct pmem_region *region, struct file *file,
	       unsigned operation);
#endif /* __KERNEL__ */

#endif //_ANDROID_PPP_H_