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/*
* gcmmu.h
*
* Copyright (C) 2010-2011 Vivante Corporation.
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef GCMMU_H
#define GCMMU_H
#include <linux/gccore.h>
#include "gcmem.h"
#include "gcqueue.h"
/*******************************************************************************
* Master table can be configured in 1KB mode with 256 maximum entries
* or 4KB mode with 1024 maximum entries.
*
* Address bit allocation.
* +------+------+--------+
* | MTLB | STLB | Offset |
* +------+------+--------+
*
* # of address bits | # of address bits | Page | Addressable | Total
* / | / | size | per one | addressable
* # of MTLB entries | # of STLB entries | | MTLB entry |
* ------------------+-------------------+------+-------------+------------
* 8 / 256 | 4 / 16 | 1MB | |
* | 8 / 256 | 64KB | 16MB | 4GB
* | 12 / 4096 | 4KB | |
* ------------------+-------------------+------+-------------+------------
* 10 / 1024 | 6 / 64 | 64KB | |
* | 10 / 1024 | 4KB | 4MB | 4GB
*/
/* Page size. */
#define GCMMU_PAGE_SIZE 4096
/* Master table definitions. */
#define GCMMU_MTLB_BITS 8
#define GCMMU_MTLB_ENTRY_NUM (1 << GCMMU_MTLB_BITS)
#define GCMMU_MTLB_SIZE (GCMMU_MTLB_ENTRY_NUM << 2)
#define GCMMU_MTLB_SHIFT (32 - GCMMU_MTLB_BITS)
#define GCMMU_MTLB_MASK (((1U << GCMMU_MTLB_BITS) - 1) \
<< GCMMU_MTLB_SHIFT)
#if GCMMU_MTLB_BITS == 8
# define GCMMU_MTLB_MODE GCREG_MMU_CONFIGURATION_MODE_MODE1_K
#elif GCMMU_MTLB_BITS == 10
# define GCMMU_MTLB_MODE GCREG_MMU_CONFIGURATION_MODE_MODE4_K
#else
# error Invalid GCMMU_MTLB_BITS.
#endif
#define GCMMU_MTLB_PRESENT_MASK 0x00000001
#define GCMMU_MTLB_EXCEPTION_MASK 0x00000002
#define GCMMU_MTLB_PAGE_SIZE_MASK 0x0000000C
#define GCMMU_MTLB_SLAVE_MASK 0xFFFFFFC0
#define GCMMU_MTLB_PRESENT 0x00000001
#define GCMMU_MTLB_EXCEPTION 0x00000002
#define GCMMU_MTLB_4K_PAGE 0x00000000
#define GCMMU_MTLB_ENTRY_VACANT GCMMU_MTLB_EXCEPTION
/* Slave table definitions. */
#define GCMMU_STLB_BITS 12
#define GCMMU_STLB_ENTRY_NUM (1 << GCMMU_STLB_BITS)
#define GCMMU_STLB_SIZE (GCMMU_STLB_ENTRY_NUM << 2)
#define GCMMU_STLB_SHIFT (32 - (GCMMU_MTLB_BITS \
+ GCMMU_STLB_BITS))
#define GCMMU_STLB_MASK (((1U << GCMMU_STLB_BITS) - 1) \
<< GCMMU_STLB_SHIFT)
#define GCMMU_STLB_PRESENT_MASK 0x00000001
#define GCMMU_STLB_EXCEPTION_MASK 0x00000002
#define GCMMU_STLB_WRITEABLE_MASK 0x00000004
#define GCMMU_STLB_ADDRESS_MASK 0xFFFFF000
#define GCMMU_STLB_PRESENT 0x00000001
#define GCMMU_STLB_EXCEPTION 0x00000002
#define GCMMU_STLB_WRITEABLE 0x00000004
#define GCMMU_STLB_ENTRY_VACANT GCMMU_STLB_EXCEPTION
/* Page offset definitions. */
#define GCMMU_OFFSET_BITS (32 - GCMMU_MTLB_BITS - GCMMU_STLB_BITS)
#define GCMMU_OFFSET_MASK ((1U << GCMMU_OFFSET_BITS) - 1)
#define GCMMU_SAFE_ZONE_SIZE 64
/* STLB preallocation count. This value controls how many slave tables will be
* allocated every time we run out of available slave tables during mapping.
* The value must be between 1 and the total number of slave tables possible,
* which is equal to 256 assuming 4KB page size. */
#define GCMMU_STLB_PREALLOC_COUNT (GCMMU_MTLB_ENTRY_NUM / 4)
/*******************************************************************************
* MMU structures.
*/
/* This union defines a location within MMU. */
union gcmmuloc {
struct _loc {
unsigned int stlb:GCMMU_STLB_BITS;
unsigned int mtlb:GCMMU_MTLB_BITS;
} loc;
unsigned int absolute;
};
/* Arenas describe memory regions. Two lists of areanas are maintained:
* one that defines a list of vacant arenas ready to map and the other
* a list of already mapped arenas. */
struct gcmmuarena {
/* Arena starting and ending points. */
union gcmmuloc start;
union gcmmuloc end;
/* Number of pages. */
unsigned int count;
/* Mapped virtual pointer. */
unsigned int address;
/* Client's virtual pointer. */
void *logical;
/* Size of the mapped buffer. */
unsigned int size;
/* Page descriptor array. */
struct page **pages;
/* Prev/next arena. */
struct list_head link;
};
/* MMU shared object. */
struct gcmmu {
/* Access lock. */
GCLOCK_TYPE lock;
/* Reference count. */
int refcount;
/* One physical page used for MMU management. */
struct gcpage gcpage;
/* Physical command buffer. */
unsigned int cmdbufphys;
unsigned int *cmdbuflog;
unsigned int cmdbufsize;
/* Safe zone location. */
unsigned int safezonephys;
unsigned int *safezonelog;
unsigned int safezonesize;
/* Currently set master table. */
unsigned int master;
/* Available page allocation arenas. */
struct list_head vacarena;
};
/* Slave table descriptor. */
struct gcmmustlb {
unsigned int physical;
unsigned int *logical;
};
struct gcmmustlbblock;
struct gcmmucontext {
/* Access lock. */
GCLOCK_TYPE lock;
/* PID of the owner process. */
pid_t pid;
/* If marked as dirty, MMU cache needs to be flushed. */
bool dirty;
/* Master table allocation. */
struct gcpage master;
/* Slave table descriptors. */
struct gcmmustlb slave[GCMMU_MTLB_ENTRY_NUM];
struct gcmmustlbblock *slavealloc;
/* MMU configuration. */
union mmuconfig {
struct gcregmmuconfiguration reg;
unsigned int raw;
} mmuconfig;
unsigned long physical;
/* Page mapping tracking. */
struct list_head vacant;
struct list_head allocated;
/* Driver instance has only one set of command buffers that must be
* mapped the same exact way in all clients. This array stores
* pointers to arena structures of mapped storage buffers. */
struct gcmmuarena *storagearray[GC_STORAGE_COUNT];
/* Prev/next context. */
struct list_head link;
};
/*******************************************************************************
* MMU management API.
*/
struct gcmmuphysmem {
/* Virtual pointer and offset of the first page to map. */
unsigned int base;
unsigned int offset;
/* An array of physical addresses of the pages to map. */
unsigned int count;
pte_t *pages;
/* 0 => system default. */
int pagesize;
};
struct gccorecontext;
enum gcerror gcmmu_init(struct gccorecontext *gccorecontext);
void gcmmu_exit(struct gccorecontext *gccorecontext);
enum gcerror gcmmu_create_context(struct gccorecontext *gccorecontext,
struct gcmmucontext *gcmmucontext,
pid_t pid);
enum gcerror gcmmu_destroy_context(struct gccorecontext *gccorecontext,
struct gcmmucontext *gcmmucontext);
enum gcerror gcmmu_enable(struct gccorecontext *gccorecontext,
struct gcqueue *gcqueue);
enum gcerror gcmmu_set_master(struct gccorecontext *gccorecontext,
struct gcmmucontext *gcmmucontext);
enum gcerror gcmmu_map(struct gccorecontext *gccorecontext,
struct gcmmucontext *gcmmucontext,
struct gcmmuphysmem *mem,
struct gcmmuarena **mapped);
enum gcerror gcmmu_unmap(struct gccorecontext *gccorecontext,
struct gcmmucontext *gcmmucontext,
struct gcmmuarena *mapped);
enum gcerror gcmmu_flush(struct gccorecontext *gccorecontext,
struct gcmmucontext *gcmmucontext);
void gcmmu_flush_finalize(struct gccmdbuf *openentry,
struct gcmommuflush *flushlogical,
unsigned int flushaddress);
enum gcerror gcmmu_fixup(struct gcfixup *fixup, unsigned int *data);
#endif
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