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153 lines
4.0 KiB
153 lines
4.0 KiB
/*
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* Copyright (C) 2017 Etnaviv Project
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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 of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that 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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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <drm/drm_mm.h>
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#include "etnaviv_cmdbuf.h"
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#include "etnaviv_gpu.h"
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#include "etnaviv_mmu.h"
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#define SUBALLOC_SIZE SZ_256K
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#define SUBALLOC_GRANULE SZ_4K
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#define SUBALLOC_GRANULES (SUBALLOC_SIZE / SUBALLOC_GRANULE)
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struct etnaviv_cmdbuf_suballoc {
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/* suballocated dma buffer properties */
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struct etnaviv_gpu *gpu;
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void *vaddr;
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dma_addr_t paddr;
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/* GPU mapping */
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u32 iova;
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struct drm_mm_node vram_node; /* only used on MMUv2 */
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/* allocation management */
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struct mutex lock;
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DECLARE_BITMAP(granule_map, SUBALLOC_GRANULES);
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int free_space;
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wait_queue_head_t free_event;
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};
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struct etnaviv_cmdbuf_suballoc *
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etnaviv_cmdbuf_suballoc_new(struct etnaviv_gpu * gpu)
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{
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struct etnaviv_cmdbuf_suballoc *suballoc;
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int ret;
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suballoc = kzalloc(sizeof(*suballoc), GFP_KERNEL);
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if (!suballoc)
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return ERR_PTR(-ENOMEM);
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suballoc->gpu = gpu;
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mutex_init(&suballoc->lock);
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init_waitqueue_head(&suballoc->free_event);
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suballoc->vaddr = dma_alloc_wc(gpu->dev, SUBALLOC_SIZE,
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&suballoc->paddr, GFP_KERNEL);
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if (!suballoc->vaddr)
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goto free_suballoc;
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ret = etnaviv_iommu_get_suballoc_va(gpu, suballoc->paddr,
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&suballoc->vram_node, SUBALLOC_SIZE,
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&suballoc->iova);
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if (ret)
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goto free_dma;
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return suballoc;
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free_dma:
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dma_free_wc(gpu->dev, SUBALLOC_SIZE, suballoc->vaddr, suballoc->paddr);
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free_suballoc:
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kfree(suballoc);
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return NULL;
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}
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void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc)
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{
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etnaviv_iommu_put_suballoc_va(suballoc->gpu, &suballoc->vram_node,
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SUBALLOC_SIZE, suballoc->iova);
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dma_free_wc(suballoc->gpu->dev, SUBALLOC_SIZE, suballoc->vaddr,
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suballoc->paddr);
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kfree(suballoc);
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}
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struct etnaviv_cmdbuf *
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etnaviv_cmdbuf_new(struct etnaviv_cmdbuf_suballoc *suballoc, u32 size,
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size_t nr_bos)
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{
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struct etnaviv_cmdbuf *cmdbuf;
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size_t sz = size_vstruct(nr_bos, sizeof(cmdbuf->bo_map[0]),
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sizeof(*cmdbuf));
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int granule_offs, order, ret;
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cmdbuf = kzalloc(sz, GFP_KERNEL);
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if (!cmdbuf)
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return NULL;
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cmdbuf->suballoc = suballoc;
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cmdbuf->size = size;
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order = order_base_2(ALIGN(size, SUBALLOC_GRANULE) / SUBALLOC_GRANULE);
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retry:
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mutex_lock(&suballoc->lock);
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granule_offs = bitmap_find_free_region(suballoc->granule_map,
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SUBALLOC_GRANULES, order);
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if (granule_offs < 0) {
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suballoc->free_space = 0;
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mutex_unlock(&suballoc->lock);
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ret = wait_event_interruptible_timeout(suballoc->free_event,
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suballoc->free_space,
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msecs_to_jiffies(10 * 1000));
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if (!ret) {
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dev_err(suballoc->gpu->dev,
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"Timeout waiting for cmdbuf space\n");
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return NULL;
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}
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goto retry;
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}
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mutex_unlock(&suballoc->lock);
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cmdbuf->suballoc_offset = granule_offs * SUBALLOC_GRANULE;
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cmdbuf->vaddr = suballoc->vaddr + cmdbuf->suballoc_offset;
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return cmdbuf;
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}
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void etnaviv_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf)
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{
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struct etnaviv_cmdbuf_suballoc *suballoc = cmdbuf->suballoc;
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int order = order_base_2(ALIGN(cmdbuf->size, SUBALLOC_GRANULE) /
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SUBALLOC_GRANULE);
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mutex_lock(&suballoc->lock);
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bitmap_release_region(suballoc->granule_map,
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cmdbuf->suballoc_offset / SUBALLOC_GRANULE,
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order);
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suballoc->free_space = 1;
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mutex_unlock(&suballoc->lock);
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wake_up_all(&suballoc->free_event);
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kfree(cmdbuf);
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}
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u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf)
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{
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return buf->suballoc->iova + buf->suballoc_offset;
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}
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dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf)
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{
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return buf->suballoc->paddr + buf->suballoc_offset;
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}
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