drivers/gpu/msm/kgsl_sharedmem.h - kernel/msm-4.9 - Gitiles

 /* Copyright (c) 2002,2007-2016, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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 __KGSL_SHAREDMEM_H
 #define __KGSL_SHAREDMEM_H

 #include <linux/dma-mapping.h>

 #include "kgsl_mmu.h"

 struct kgsl_device;
 struct kgsl_process_private;

 #define KGSL_CACHE_OP_INV       0x01
 #define KGSL_CACHE_OP_FLUSH     0x02
 #define KGSL_CACHE_OP_CLEAN     0x03

 int kgsl_sharedmem_alloc_contig(struct kgsl_device *device,
 			struct kgsl_memdesc *memdesc,
 			uint64_t size);

 void kgsl_sharedmem_free(struct kgsl_memdesc *memdesc);

 int kgsl_sharedmem_readl(const struct kgsl_memdesc *memdesc,
 			uint32_t *dst,
 			uint64_t offsetbytes);

 int kgsl_sharedmem_writel(struct kgsl_device *device,
 			const struct kgsl_memdesc *memdesc,
 			uint64_t offsetbytes,
 			uint32_t src);

 int kgsl_sharedmem_readq(const struct kgsl_memdesc *memdesc,
 			uint64_t *dst,
 			uint64_t offsetbytes);

 int kgsl_sharedmem_writeq(struct kgsl_device *device,
 			const struct kgsl_memdesc *memdesc,
 			uint64_t offsetbytes,
 			uint64_t src);

 int kgsl_sharedmem_set(struct kgsl_device *device,
 			const struct kgsl_memdesc *memdesc,
 			uint64_t offsetbytes, unsigned int value,
 			uint64_t sizebytes);

 int kgsl_cache_range_op(struct kgsl_memdesc *memdesc,
 			uint64_t offset, uint64_t size,
 			unsigned int op);

 void kgsl_process_init_sysfs(struct kgsl_device *device,
 		struct kgsl_process_private *private);
 void kgsl_process_uninit_sysfs(struct kgsl_process_private *private);

 int kgsl_sharedmem_init_sysfs(void);
 void kgsl_sharedmem_uninit_sysfs(void);

 int kgsl_allocate_user(struct kgsl_device *device,
 		struct kgsl_memdesc *memdesc,
 		uint64_t size, uint64_t flags);

 void kgsl_get_memory_usage(char *str, size_t len, uint64_t memflags);

 int kgsl_sharedmem_page_alloc_user(struct kgsl_memdesc *memdesc,
 				uint64_t size);

 #define MEMFLAGS(_flags, _mask, _shift) \
 	((unsigned int) (((_flags) & (_mask)) >> (_shift)))

 /*
  * kgsl_memdesc_get_align - Get alignment flags from a memdesc
  * @memdesc - the memdesc
  *
  * Returns the alignment requested, as power of 2 exponent.
  */
 static inline int
 kgsl_memdesc_get_align(const struct kgsl_memdesc *memdesc)
 {
 	return MEMFLAGS(memdesc->flags, KGSL_MEMALIGN_MASK,
 		KGSL_MEMALIGN_SHIFT);
 }

 /*
  * kgsl_memdesc_get_pagesize - Get pagesize based on alignment
  * @memdesc - the memdesc
  *
  * Returns the pagesize based on memdesc alignment
  */
 static inline int
 kgsl_memdesc_get_pagesize(const struct kgsl_memdesc *memdesc)
 {
 	return (1 << kgsl_memdesc_get_align(memdesc));
 }

 /*
  * kgsl_memdesc_get_cachemode - Get cache mode of a memdesc
  * @memdesc: the memdesc
  *
  * Returns a KGSL_CACHEMODE* value.
  */
 static inline int
 kgsl_memdesc_get_cachemode(const struct kgsl_memdesc *memdesc)
 {
 	return MEMFLAGS(memdesc->flags, KGSL_CACHEMODE_MASK,
 		KGSL_CACHEMODE_SHIFT);
 }

 static inline unsigned int
 kgsl_memdesc_get_memtype(const struct kgsl_memdesc *memdesc)
 {
 	return MEMFLAGS(memdesc->flags, KGSL_MEMTYPE_MASK,
 		KGSL_MEMTYPE_SHIFT);
 }
 /*
  * kgsl_memdesc_set_align - Set alignment flags of a memdesc
  * @memdesc - the memdesc
  * @align - alignment requested, as a power of 2 exponent.
  */
 static inline int
 kgsl_memdesc_set_align(struct kgsl_memdesc *memdesc, unsigned int align)
 {
 	if (align > 32)
 		align = 32;

 	memdesc->flags &= ~KGSL_MEMALIGN_MASK;
 	memdesc->flags |= (align << KGSL_MEMALIGN_SHIFT) & KGSL_MEMALIGN_MASK;
 	return 0;
 }

 /**
  * kgsl_memdesc_usermem_type - return buffer type
  * @memdesc - the memdesc
  *
  * Returns a KGSL_MEM_ENTRY_* value for this buffer, which
  * identifies if was allocated by us, or imported from
  * another allocator.
  */
 static inline unsigned int
 kgsl_memdesc_usermem_type(const struct kgsl_memdesc *memdesc)
 {
 	return MEMFLAGS(memdesc->flags, KGSL_MEMFLAGS_USERMEM_MASK,
 		KGSL_MEMFLAGS_USERMEM_SHIFT);
 }

 /**
  * memdesg_sg_dma() - Turn a dma_addr (from CMA) into a sg table
  * @memdesc: Pointer to the memdesc structure
  * @addr: Physical address from the dma_alloc function
  * @size: Size of the chunk
  *
  * Create a sg table for the contigious chunk specified by addr and size.
  */
 static inline int
 memdesc_sg_dma(struct kgsl_memdesc *memdesc,
 		phys_addr_t addr, uint64_t size)
 {
 	int ret;
 	struct page *page = phys_to_page(addr);

 	memdesc->sgt = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 	if (memdesc->sgt == NULL)
 		return -ENOMEM;

 	ret = sg_alloc_table(memdesc->sgt, 1, GFP_KERNEL);
 	if (ret) {
 		kfree(memdesc->sgt);
 		memdesc->sgt = NULL;
 		return ret;
 	}

 	sg_set_page(memdesc->sgt->sgl, page, (size_t) size, 0);
 	return 0;
 }

 /*
  * kgsl_memdesc_is_global - is this a globally mapped buffer?
  * @memdesc: the memdesc
  *
  * Returns nonzero if this is a global mapping, 0 otherwise
  */
 static inline int kgsl_memdesc_is_global(const struct kgsl_memdesc *memdesc)
 {
 	return (memdesc->priv & KGSL_MEMDESC_GLOBAL) != 0;
 }

 /*
  * kgsl_memdesc_is_secured - is this a secure buffer?
  * @memdesc: the memdesc
  *
  * Returns true if this is a secure mapping, false otherwise
  */
 static inline bool kgsl_memdesc_is_secured(const struct kgsl_memdesc *memdesc)
 {
 	return memdesc && (memdesc->priv & KGSL_MEMDESC_SECURE);
 }

 /*
  * kgsl_memdesc_has_guard_page - is the last page a guard page?
  * @memdesc - the memdesc
  *
  * Returns nonzero if there is a guard page, 0 otherwise
  */
 static inline int
 kgsl_memdesc_has_guard_page(const struct kgsl_memdesc *memdesc)
 {
 	return (memdesc->priv & KGSL_MEMDESC_GUARD_PAGE) != 0;
 }

 /*
  * kgsl_memdesc_guard_page_size - returns guard page size
  * @memdesc - the memdesc
  *
  * Returns guard page size
  */
 static inline uint64_t
 kgsl_memdesc_guard_page_size(const struct kgsl_memdesc *memdesc)
 {
 	if (!kgsl_memdesc_has_guard_page(memdesc))
 		return 0;

 	if (kgsl_memdesc_is_secured(memdesc)) {
 		if (memdesc->pagetable != NULL &&
 				memdesc->pagetable->mmu != NULL)
 			return memdesc->pagetable->mmu->secure_align_mask + 1;
 	}

 	return PAGE_SIZE;
 }

 /*
  * kgsl_memdesc_use_cpu_map - use the same virtual mapping on CPU and GPU?
  * @memdesc - the memdesc
  */
 static inline int
 kgsl_memdesc_use_cpu_map(const struct kgsl_memdesc *memdesc)
 {
 	return (memdesc->flags & KGSL_MEMFLAGS_USE_CPU_MAP) != 0;
 }

 /*
  * kgsl_memdesc_footprint - get the size of the mmap region
  * @memdesc - the memdesc
  *
  * The entire memdesc must be mapped. Additionally if the
  * CPU mapping is going to be mirrored, there must be room
  * for the guard page to be mapped so that the address spaces
  * match up.
  */
 static inline uint64_t
 kgsl_memdesc_footprint(const struct kgsl_memdesc *memdesc)
 {
 	return  memdesc->size + kgsl_memdesc_guard_page_size(memdesc);
 }

 /*
  * kgsl_allocate_global() - Allocate GPU accessible memory that will be global
  * across all processes
  * @device: The device pointer to which the memdesc belongs
  * @memdesc: Pointer to a KGSL memory descriptor for the memory allocation
  * @size: size of the allocation
  * @flags: Allocation flags that control how the memory is mapped
  * @priv: Priv flags that controls memory attributes
  *
  * Allocate contiguous memory for internal use and add the allocation to the
  * list of global pagetable entries that will be mapped at the same address in
  * all pagetables.  This is for use for device wide GPU allocations such as
  * ringbuffers.
  */
 static inline int kgsl_allocate_global(struct kgsl_device *device,
 	struct kgsl_memdesc *memdesc, uint64_t size, uint64_t flags,
 	unsigned int priv, const char *name)
 {
 	int ret;

 	memdesc->flags = flags;
 	memdesc->priv = priv;

 	if (((memdesc->priv & KGSL_MEMDESC_CONTIG) != 0) ||
 		(kgsl_mmu_get_mmutype(device) == KGSL_MMU_TYPE_NONE))
 		ret = kgsl_sharedmem_alloc_contig(device, memdesc,
 						(size_t) size);
 	else {
 		ret = kgsl_sharedmem_page_alloc_user(memdesc, (size_t) size);
 		if (ret == 0) {
 			if (kgsl_memdesc_map(memdesc) == NULL)
 				ret = -ENOMEM;
 		}
 	}

 	if (ret == 0)
 		kgsl_mmu_add_global(device, memdesc, name);

 	return ret;
 }

 /**
  * kgsl_free_global() - Free a device wide GPU allocation and remove it from the
  * global pagetable entry list
  *
  * @device: Pointer to the device
  * @memdesc: Pointer to the GPU memory descriptor to free
  *
  * Remove the specific memory descriptor from the global pagetable entry list
  * and free it
  */
 static inline void kgsl_free_global(struct kgsl_device *device,
 		struct kgsl_memdesc *memdesc)
 {
 	kgsl_mmu_remove_global(device, memdesc);
 	kgsl_sharedmem_free(memdesc);
 }

 void kgsl_sharedmem_set_noretry(bool val);
 bool kgsl_sharedmem_get_noretry(void);

 /**
  * kgsl_alloc_sgt_from_pages() - Allocate a sg table
  *
  * @memdesc: memory descriptor of the allocation
  *
  * Allocate and return pointer to a sg table
  */
 static inline struct sg_table *kgsl_alloc_sgt_from_pages(
 				struct kgsl_memdesc *m)
 {
 	int ret;
 	struct sg_table *sgt;

 	sgt = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 	if (sgt == NULL)
 		return ERR_PTR(-ENOMEM);

 	ret = sg_alloc_table_from_pages(sgt, m->pages, m->page_count, 0,
 					m->size, GFP_KERNEL);
 	if (ret) {
 		kfree(sgt);
 		return ERR_PTR(ret);
 	}

 	return sgt;
 }

 /**
  * kgsl_free_sgt() - Free a sg table structure
  *
  * @sgt: sg table pointer to be freed
  *
  * Free the sg table allocated using sgt and free the
  * sgt structure itself
  */
 static inline void kgsl_free_sgt(struct sg_table *sgt)
 {
 	if (sgt != NULL) {
 		sg_free_table(sgt);
 		kfree(sgt);
 	}
 }

 /**
  * kgsl_get_page_size() - Get supported pagesize
  * @size: Size of the page
  * @align: Desired alignment of the size
  *
  * Return supported pagesize
  */
 #ifndef CONFIG_ALLOC_BUFFERS_IN_4K_CHUNKS
 static inline int kgsl_get_page_size(size_t size, unsigned int align)
 {
 	if (align >= ilog2(SZ_1M) && size >= SZ_1M)
 		return SZ_1M;
 	else if (align >= ilog2(SZ_64K) && size >= SZ_64K)
 		return SZ_64K;
 	else if (align >= ilog2(SZ_8K) && size >= SZ_8K)
 		return SZ_8K;
 	else
 		return PAGE_SIZE;
 }
 #else
 static inline int kgsl_get_page_size(size_t size, unsigned int align)
 {
 	return PAGE_SIZE;
 }
 #endif

 #endif /* __KGSL_SHAREDMEM_H */
	/* Copyright (c) 2002,2007-2016, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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 __KGSL_SHAREDMEM_H
	#define __KGSL_SHAREDMEM_H

	#include <linux/dma-mapping.h>

	#include "kgsl_mmu.h"

	struct kgsl_device;
	struct kgsl_process_private;

	#define KGSL_CACHE_OP_INV 0x01
	#define KGSL_CACHE_OP_FLUSH 0x02
	#define KGSL_CACHE_OP_CLEAN 0x03

	int kgsl_sharedmem_alloc_contig(struct kgsl_device *device,
	struct kgsl_memdesc *memdesc,
	uint64_t size);

	void kgsl_sharedmem_free(struct kgsl_memdesc *memdesc);

	int kgsl_sharedmem_readl(const struct kgsl_memdesc *memdesc,
	uint32_t *dst,
	uint64_t offsetbytes);

	int kgsl_sharedmem_writel(struct kgsl_device *device,
	const struct kgsl_memdesc *memdesc,
	uint64_t offsetbytes,
	uint32_t src);

	int kgsl_sharedmem_readq(const struct kgsl_memdesc *memdesc,
	uint64_t *dst,
	uint64_t offsetbytes);

	int kgsl_sharedmem_writeq(struct kgsl_device *device,
	const struct kgsl_memdesc *memdesc,
	uint64_t offsetbytes,
	uint64_t src);

	int kgsl_sharedmem_set(struct kgsl_device *device,
	const struct kgsl_memdesc *memdesc,
	uint64_t offsetbytes, unsigned int value,
	uint64_t sizebytes);

	int kgsl_cache_range_op(struct kgsl_memdesc *memdesc,
	uint64_t offset, uint64_t size,
	unsigned int op);

	void kgsl_process_init_sysfs(struct kgsl_device *device,
	struct kgsl_process_private *private);
	void kgsl_process_uninit_sysfs(struct kgsl_process_private *private);

	int kgsl_sharedmem_init_sysfs(void);
	void kgsl_sharedmem_uninit_sysfs(void);

	int kgsl_allocate_user(struct kgsl_device *device,
	struct kgsl_memdesc *memdesc,
	uint64_t size, uint64_t flags);

	void kgsl_get_memory_usage(char *str, size_t len, uint64_t memflags);

	int kgsl_sharedmem_page_alloc_user(struct kgsl_memdesc *memdesc,
	uint64_t size);

	#define MEMFLAGS(_flags, _mask, _shift) \
	((unsigned int) (((_flags) & (_mask)) >> (_shift)))

	/*
	* kgsl_memdesc_get_align - Get alignment flags from a memdesc
	* @memdesc - the memdesc
	*
	* Returns the alignment requested, as power of 2 exponent.
	*/
	static inline int
	kgsl_memdesc_get_align(const struct kgsl_memdesc *memdesc)
	{
	return MEMFLAGS(memdesc->flags, KGSL_MEMALIGN_MASK,
	KGSL_MEMALIGN_SHIFT);
	}

	/*
	* kgsl_memdesc_get_pagesize - Get pagesize based on alignment
	* @memdesc - the memdesc
	*
	* Returns the pagesize based on memdesc alignment
	*/
	static inline int
	kgsl_memdesc_get_pagesize(const struct kgsl_memdesc *memdesc)
	{
	return (1 << kgsl_memdesc_get_align(memdesc));
	}

	/*
	* kgsl_memdesc_get_cachemode - Get cache mode of a memdesc
	* @memdesc: the memdesc
	*
	* Returns a KGSL_CACHEMODE* value.
	*/
	static inline int
	kgsl_memdesc_get_cachemode(const struct kgsl_memdesc *memdesc)
	{
	return MEMFLAGS(memdesc->flags, KGSL_CACHEMODE_MASK,
	KGSL_CACHEMODE_SHIFT);
	}

	static inline unsigned int
	kgsl_memdesc_get_memtype(const struct kgsl_memdesc *memdesc)
	{
	return MEMFLAGS(memdesc->flags, KGSL_MEMTYPE_MASK,
	KGSL_MEMTYPE_SHIFT);
	}
	/*
	* kgsl_memdesc_set_align - Set alignment flags of a memdesc
	* @memdesc - the memdesc
	* @align - alignment requested, as a power of 2 exponent.
	*/
	static inline int
	kgsl_memdesc_set_align(struct kgsl_memdesc *memdesc, unsigned int align)
	{
	if (align > 32)
	align = 32;

	memdesc->flags &= ~KGSL_MEMALIGN_MASK;
	memdesc->flags \|= (align << KGSL_MEMALIGN_SHIFT) & KGSL_MEMALIGN_MASK;
	return 0;
	}

	/**
	* kgsl_memdesc_usermem_type - return buffer type
	* @memdesc - the memdesc
	*
	* Returns a KGSL_MEM_ENTRY_* value for this buffer, which
	* identifies if was allocated by us, or imported from
	* another allocator.
	*/
	static inline unsigned int
	kgsl_memdesc_usermem_type(const struct kgsl_memdesc *memdesc)
	{
	return MEMFLAGS(memdesc->flags, KGSL_MEMFLAGS_USERMEM_MASK,
	KGSL_MEMFLAGS_USERMEM_SHIFT);
	}

	/**
	* memdesg_sg_dma() - Turn a dma_addr (from CMA) into a sg table
	* @memdesc: Pointer to the memdesc structure
	* @addr: Physical address from the dma_alloc function
	* @size: Size of the chunk
	*
	* Create a sg table for the contigious chunk specified by addr and size.
	*/
	static inline int
	memdesc_sg_dma(struct kgsl_memdesc *memdesc,
	phys_addr_t addr, uint64_t size)
	{
	int ret;
	struct page *page = phys_to_page(addr);

	memdesc->sgt = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (memdesc->sgt == NULL)
	return -ENOMEM;

	ret = sg_alloc_table(memdesc->sgt, 1, GFP_KERNEL);
	if (ret) {
	kfree(memdesc->sgt);
	memdesc->sgt = NULL;
	return ret;
	}

	sg_set_page(memdesc->sgt->sgl, page, (size_t) size, 0);
	return 0;
	}

	/*
	* kgsl_memdesc_is_global - is this a globally mapped buffer?
	* @memdesc: the memdesc
	*
	* Returns nonzero if this is a global mapping, 0 otherwise
	*/
	static inline int kgsl_memdesc_is_global(const struct kgsl_memdesc *memdesc)
	{
	return (memdesc->priv & KGSL_MEMDESC_GLOBAL) != 0;
	}

	/*
	* kgsl_memdesc_is_secured - is this a secure buffer?
	* @memdesc: the memdesc
	*
	* Returns true if this is a secure mapping, false otherwise
	*/
	static inline bool kgsl_memdesc_is_secured(const struct kgsl_memdesc *memdesc)
	{
	return memdesc && (memdesc->priv & KGSL_MEMDESC_SECURE);
	}

	/*
	* kgsl_memdesc_has_guard_page - is the last page a guard page?
	* @memdesc - the memdesc
	*
	* Returns nonzero if there is a guard page, 0 otherwise
	*/
	static inline int
	kgsl_memdesc_has_guard_page(const struct kgsl_memdesc *memdesc)
	{
	return (memdesc->priv & KGSL_MEMDESC_GUARD_PAGE) != 0;
	}

	/*
	* kgsl_memdesc_guard_page_size - returns guard page size
	* @memdesc - the memdesc
	*
	* Returns guard page size
	*/
	static inline uint64_t
	kgsl_memdesc_guard_page_size(const struct kgsl_memdesc *memdesc)
	{
	if (!kgsl_memdesc_has_guard_page(memdesc))
	return 0;

	if (kgsl_memdesc_is_secured(memdesc)) {
	if (memdesc->pagetable != NULL &&
	memdesc->pagetable->mmu != NULL)
	return memdesc->pagetable->mmu->secure_align_mask + 1;
	}

	return PAGE_SIZE;
	}

	/*
	* kgsl_memdesc_use_cpu_map - use the same virtual mapping on CPU and GPU?
	* @memdesc - the memdesc
	*/
	static inline int
	kgsl_memdesc_use_cpu_map(const struct kgsl_memdesc *memdesc)
	{
	return (memdesc->flags & KGSL_MEMFLAGS_USE_CPU_MAP) != 0;
	}

	/*
	* kgsl_memdesc_footprint - get the size of the mmap region
	* @memdesc - the memdesc
	*
	* The entire memdesc must be mapped. Additionally if the
	* CPU mapping is going to be mirrored, there must be room
	* for the guard page to be mapped so that the address spaces
	* match up.
	*/
	static inline uint64_t
	kgsl_memdesc_footprint(const struct kgsl_memdesc *memdesc)
	{
	return memdesc->size + kgsl_memdesc_guard_page_size(memdesc);
	}

	/*
	* kgsl_allocate_global() - Allocate GPU accessible memory that will be global
	* across all processes
	* @device: The device pointer to which the memdesc belongs
	* @memdesc: Pointer to a KGSL memory descriptor for the memory allocation
	* @size: size of the allocation
	* @flags: Allocation flags that control how the memory is mapped
	* @priv: Priv flags that controls memory attributes
	*
	* Allocate contiguous memory for internal use and add the allocation to the
	* list of global pagetable entries that will be mapped at the same address in
	* all pagetables. This is for use for device wide GPU allocations such as
	* ringbuffers.
	*/
	static inline int kgsl_allocate_global(struct kgsl_device *device,
	struct kgsl_memdesc *memdesc, uint64_t size, uint64_t flags,
	unsigned int priv, const char *name)
	{
	int ret;

	memdesc->flags = flags;
	memdesc->priv = priv;

	if (((memdesc->priv & KGSL_MEMDESC_CONTIG) != 0) \|\|
	(kgsl_mmu_get_mmutype(device) == KGSL_MMU_TYPE_NONE))
	ret = kgsl_sharedmem_alloc_contig(device, memdesc,
	(size_t) size);
	else {
	ret = kgsl_sharedmem_page_alloc_user(memdesc, (size_t) size);
	if (ret == 0) {
	if (kgsl_memdesc_map(memdesc) == NULL)
	ret = -ENOMEM;
	}
	}

	if (ret == 0)
	kgsl_mmu_add_global(device, memdesc, name);

	return ret;
	}

	/**
	* kgsl_free_global() - Free a device wide GPU allocation and remove it from the
	* global pagetable entry list
	*
	* @device: Pointer to the device
	* @memdesc: Pointer to the GPU memory descriptor to free
	*
	* Remove the specific memory descriptor from the global pagetable entry list
	* and free it
	*/
	static inline void kgsl_free_global(struct kgsl_device *device,
	struct kgsl_memdesc *memdesc)
	{
	kgsl_mmu_remove_global(device, memdesc);
	kgsl_sharedmem_free(memdesc);
	}

	void kgsl_sharedmem_set_noretry(bool val);
	bool kgsl_sharedmem_get_noretry(void);

	/**
	* kgsl_alloc_sgt_from_pages() - Allocate a sg table
	*
	* @memdesc: memory descriptor of the allocation
	*
	* Allocate and return pointer to a sg table
	*/
	static inline struct sg_table *kgsl_alloc_sgt_from_pages(
	struct kgsl_memdesc *m)
	{
	int ret;
	struct sg_table *sgt;

	sgt = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (sgt == NULL)
	return ERR_PTR(-ENOMEM);

	ret = sg_alloc_table_from_pages(sgt, m->pages, m->page_count, 0,
	m->size, GFP_KERNEL);
	if (ret) {
	kfree(sgt);
	return ERR_PTR(ret);
	}

	return sgt;
	}

	/**
	* kgsl_free_sgt() - Free a sg table structure
	*
	* @sgt: sg table pointer to be freed
	*
	* Free the sg table allocated using sgt and free the
	* sgt structure itself
	*/
	static inline void kgsl_free_sgt(struct sg_table *sgt)
	{
	if (sgt != NULL) {
	sg_free_table(sgt);
	kfree(sgt);
	}
	}

	/**
	* kgsl_get_page_size() - Get supported pagesize
	* @size: Size of the page
	* @align: Desired alignment of the size
	*
	* Return supported pagesize
	*/
	#ifndef CONFIG_ALLOC_BUFFERS_IN_4K_CHUNKS
	static inline int kgsl_get_page_size(size_t size, unsigned int align)
	{
	if (align >= ilog2(SZ_1M) && size >= SZ_1M)
	return SZ_1M;
	else if (align >= ilog2(SZ_64K) && size >= SZ_64K)
	return SZ_64K;
	else if (align >= ilog2(SZ_8K) && size >= SZ_8K)
	return SZ_8K;
	else
	return PAGE_SIZE;
	}
	#else
	static inline int kgsl_get_page_size(size_t size, unsigned int align)
	{
	return PAGE_SIZE;
	}
	#endif

	#endif /* __KGSL_SHAREDMEM_H */