forked from Minki/linux
2f9225dbc0
Less dynamic allocations and slims down the cmdbuf object to only the required information, as everything else is already available in the submit object. This also simplifies buffer and mappings lifetime management, as they are now exlusively attached to the submit object and not additionally to the cmdbuf. Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*
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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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#include "etnaviv_perfmon.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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int etnaviv_cmdbuf_init(struct etnaviv_cmdbuf_suballoc *suballoc,
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struct etnaviv_cmdbuf *cmdbuf, u32 size)
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{
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int granule_offs, order, ret;
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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 -ETIMEDOUT;
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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 0;
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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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}
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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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