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