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git://nv-tegra.nvidia.com/linux-nvgpu.git
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abec0ddc19
Replace manual buffer allocation and cpu_va pointer accesses with
gk20a_gmmu_{alloc,free}() and gk20a_mem_{rd,wr}() using a struct
mem_desc in gk20a_semaphore_pool, for buffer aperture flexibility.
JIRA DNVGPU-23
Change-Id: I394c38f407a9da02480bfd35062a892eec242ea3
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1146684
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>
98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
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* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef SEMAPHORE_GK20A_H
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#define SEMAPHORE_GK20A_H
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#include <linux/kref.h>
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#include "gk20a_allocator.h"
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#include "mm_gk20a.h"
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/* A memory pool for holding semaphores. */
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struct gk20a_semaphore_pool {
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struct mem_desc mem;
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struct gk20a *g;
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struct list_head maps;
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struct mutex maps_mutex;
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struct kref ref;
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struct gk20a_allocator alloc;
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};
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enum gk20a_mem_rw_flag {
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gk20a_mem_flag_none = 0,
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gk20a_mem_flag_read_only = 1,
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gk20a_mem_flag_write_only = 2,
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};
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/* A semaphore pool can be mapped to multiple GPU address spaces. */
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struct gk20a_semaphore_pool_map {
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u64 gpu_va;
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enum gk20a_mem_rw_flag rw_flag;
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struct vm_gk20a *vm;
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struct list_head list;
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};
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/* A semaphore that lives inside a semaphore pool. */
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struct gk20a_semaphore {
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struct gk20a_semaphore_pool *pool;
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/*
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* value exists within the pool's memory at the specified offset.
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* 0=acquired, 1=released.
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*/
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u32 offset; /* byte offset within pool */
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struct kref ref;
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};
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/* Create a semaphore pool that can hold at most 'capacity' semaphores. */
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struct gk20a_semaphore_pool *
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gk20a_semaphore_pool_alloc(struct gk20a *, const char *unique_name,
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size_t capacity);
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void gk20a_semaphore_pool_put(struct gk20a_semaphore_pool *);
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int gk20a_semaphore_pool_map(struct gk20a_semaphore_pool *,
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struct vm_gk20a *,
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enum gk20a_mem_rw_flag);
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void gk20a_semaphore_pool_unmap(struct gk20a_semaphore_pool *,
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struct vm_gk20a *);
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u64 gk20a_semaphore_pool_gpu_va(struct gk20a_semaphore_pool *,
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struct vm_gk20a *);
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/* Allocate a semaphore from the semaphore pool. The newly allocated
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* semaphore will be in acquired state (value=0). */
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struct gk20a_semaphore *
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gk20a_semaphore_alloc(struct gk20a_semaphore_pool *);
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void gk20a_semaphore_put(struct gk20a_semaphore *);
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void gk20a_semaphore_get(struct gk20a_semaphore *);
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static inline u64 gk20a_semaphore_gpu_va(struct gk20a_semaphore *s,
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struct vm_gk20a *vm)
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{
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return gk20a_semaphore_pool_gpu_va(s->pool, vm) + s->offset;
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}
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static inline bool gk20a_semaphore_is_acquired(struct gk20a_semaphore *s)
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{
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u32 v = gk20a_mem_rd(s->pool->g, &s->pool->mem, s->offset);
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/* When often block on value reaching a certain threshold. We must make
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* sure that if we get unblocked, we haven't read anything too early. */
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smp_rmb();
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return v == 0;
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}
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static inline void gk20a_semaphore_release(struct gk20a_semaphore *s)
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{
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smp_wmb();
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gk20a_mem_wr(s->pool->g, &s->pool->mem, s->offset, 1);
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}
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#endif
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