venus: add vn_renderer_shmem_pool
It provides shmem suballocations. It is designed to be used with short-lived shmems. A long-lived shmem can hold on to some large allocation while only using a likely small region of the large allocation. v2: cleanups suggested by Yiwei Signed-off-by: Chia-I Wu <olvaffe@gmail.com> Reviewed-by: Ryan Neph <ryanneph@google.com> (v1) Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14179>
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@ -43,3 +43,71 @@ vn_renderer_submit_simple_sync(struct vn_renderer *renderer,
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return result;
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}
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void
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vn_renderer_shmem_pool_init(UNUSED struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool,
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size_t min_alloc_size)
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{
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*pool = (struct vn_renderer_shmem_pool){
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/* power-of-two to hit shmem cache */
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.min_alloc_size = util_next_power_of_two(min_alloc_size),
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};
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}
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void
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vn_renderer_shmem_pool_fini(struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool)
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{
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if (pool->shmem)
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vn_renderer_shmem_unref(renderer, pool->shmem);
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}
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static bool
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vn_renderer_shmem_pool_grow(struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool,
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size_t size)
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{
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/* power-of-two to hit shmem cache */
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size_t alloc_size = pool->min_alloc_size;
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while (alloc_size < size) {
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alloc_size <<= 1;
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if (!alloc_size)
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return false;
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}
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struct vn_renderer_shmem *shmem =
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vn_renderer_shmem_create(renderer, alloc_size);
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if (!shmem)
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return false;
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if (pool->shmem)
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vn_renderer_shmem_unref(renderer, pool->shmem);
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pool->shmem = shmem;
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pool->size = alloc_size;
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pool->used = 0;
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return true;
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}
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struct vn_renderer_shmem *
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vn_renderer_shmem_pool_alloc(struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool,
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size_t size,
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size_t *out_offset)
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{
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if (unlikely(size > pool->size - pool->used)) {
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if (!vn_renderer_shmem_pool_grow(renderer, pool, size))
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return NULL;
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assert(size <= pool->size - pool->used);
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}
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struct vn_renderer_shmem *shmem =
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vn_renderer_shmem_ref(renderer, pool->shmem);
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*out_offset = pool->used;
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pool->used += size;
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return shmem;
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}
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@ -8,6 +8,15 @@
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#include "vn_renderer.h"
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/* for suballocations of short-lived shmems, not thread-safe */
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struct vn_renderer_shmem_pool {
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size_t min_alloc_size;
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struct vn_renderer_shmem *shmem;
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size_t size;
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size_t used;
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};
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static inline VkResult
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vn_renderer_submit_simple(struct vn_renderer *renderer,
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const void *cs_data,
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@ -29,4 +38,19 @@ vn_renderer_submit_simple_sync(struct vn_renderer *renderer,
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const void *cs_data,
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size_t cs_size);
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void
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vn_renderer_shmem_pool_init(struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool,
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size_t min_alloc_size);
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void
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vn_renderer_shmem_pool_fini(struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool);
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struct vn_renderer_shmem *
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vn_renderer_shmem_pool_alloc(struct vn_renderer *renderer,
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struct vn_renderer_shmem_pool *pool,
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size_t size,
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size_t *out_offset);
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#endif /* VN_RENDERER_UTIL_H */
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