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db3697295c
Since my last struct_mutex crusade someone escaped! This already has the advantage that for the common case when someone else holds a ref the unref won't even acquire dev->struct_mutex. And I'm working on code to allow drivers to completely opt-out of any and all dev->struct_mutex usage, but that only works if they use the _unlocked variants everywhere. v2: Drop comment too. v3: Drop the other comment too. Cc: Eric Anholt <eric@anholt.net> Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1464630800-30786-15-git-send-email-daniel.vetter@ffwll.ch
556 lines
14 KiB
C
556 lines
14 KiB
C
/*
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* Copyright © 2015 Broadcom
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* DOC: VC4 GEM BO management support.
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*
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* The VC4 GPU architecture (both scanout and rendering) has direct
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* access to system memory with no MMU in between. To support it, we
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* use the GEM CMA helper functions to allocate contiguous ranges of
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* physical memory for our BOs.
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*
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* Since the CMA allocator is very slow, we keep a cache of recently
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* freed BOs around so that the kernel's allocation of objects for 3D
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* rendering can return quickly.
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*/
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#include "vc4_drv.h"
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#include "uapi/drm/vc4_drm.h"
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static void vc4_bo_stats_dump(struct vc4_dev *vc4)
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{
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DRM_INFO("num bos allocated: %d\n",
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vc4->bo_stats.num_allocated);
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DRM_INFO("size bos allocated: %dkb\n",
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vc4->bo_stats.size_allocated / 1024);
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DRM_INFO("num bos used: %d\n",
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vc4->bo_stats.num_allocated - vc4->bo_stats.num_cached);
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DRM_INFO("size bos used: %dkb\n",
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(vc4->bo_stats.size_allocated -
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vc4->bo_stats.size_cached) / 1024);
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DRM_INFO("num bos cached: %d\n",
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vc4->bo_stats.num_cached);
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DRM_INFO("size bos cached: %dkb\n",
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vc4->bo_stats.size_cached / 1024);
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}
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#ifdef CONFIG_DEBUG_FS
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int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
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{
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struct drm_info_node *node = (struct drm_info_node *)m->private;
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struct drm_device *dev = node->minor->dev;
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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struct vc4_bo_stats stats;
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/* Take a snapshot of the current stats with the lock held. */
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mutex_lock(&vc4->bo_lock);
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stats = vc4->bo_stats;
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mutex_unlock(&vc4->bo_lock);
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seq_printf(m, "num bos allocated: %d\n",
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stats.num_allocated);
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seq_printf(m, "size bos allocated: %dkb\n",
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stats.size_allocated / 1024);
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seq_printf(m, "num bos used: %d\n",
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stats.num_allocated - stats.num_cached);
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seq_printf(m, "size bos used: %dkb\n",
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(stats.size_allocated - stats.size_cached) / 1024);
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seq_printf(m, "num bos cached: %d\n",
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stats.num_cached);
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seq_printf(m, "size bos cached: %dkb\n",
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stats.size_cached / 1024);
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return 0;
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}
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#endif
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static uint32_t bo_page_index(size_t size)
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{
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return (size / PAGE_SIZE) - 1;
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}
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/* Must be called with bo_lock held. */
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static void vc4_bo_destroy(struct vc4_bo *bo)
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{
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struct drm_gem_object *obj = &bo->base.base;
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struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
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if (bo->validated_shader) {
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kfree(bo->validated_shader->texture_samples);
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kfree(bo->validated_shader);
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bo->validated_shader = NULL;
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}
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vc4->bo_stats.num_allocated--;
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vc4->bo_stats.size_allocated -= obj->size;
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drm_gem_cma_free_object(obj);
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}
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/* Must be called with bo_lock held. */
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static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
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{
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struct drm_gem_object *obj = &bo->base.base;
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struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
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vc4->bo_stats.num_cached--;
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vc4->bo_stats.size_cached -= obj->size;
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list_del(&bo->unref_head);
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list_del(&bo->size_head);
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}
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static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
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size_t size)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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uint32_t page_index = bo_page_index(size);
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if (vc4->bo_cache.size_list_size <= page_index) {
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uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
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page_index + 1);
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struct list_head *new_list;
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uint32_t i;
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new_list = kmalloc_array(new_size, sizeof(struct list_head),
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GFP_KERNEL);
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if (!new_list)
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return NULL;
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/* Rebase the old cached BO lists to their new list
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* head locations.
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*/
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for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
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struct list_head *old_list =
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&vc4->bo_cache.size_list[i];
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if (list_empty(old_list))
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INIT_LIST_HEAD(&new_list[i]);
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else
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list_replace(old_list, &new_list[i]);
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}
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/* And initialize the brand new BO list heads. */
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for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
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INIT_LIST_HEAD(&new_list[i]);
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kfree(vc4->bo_cache.size_list);
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vc4->bo_cache.size_list = new_list;
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vc4->bo_cache.size_list_size = new_size;
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}
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return &vc4->bo_cache.size_list[page_index];
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}
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void vc4_bo_cache_purge(struct drm_device *dev)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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mutex_lock(&vc4->bo_lock);
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while (!list_empty(&vc4->bo_cache.time_list)) {
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struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
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struct vc4_bo, unref_head);
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vc4_bo_remove_from_cache(bo);
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vc4_bo_destroy(bo);
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}
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mutex_unlock(&vc4->bo_lock);
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}
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static struct vc4_bo *vc4_bo_get_from_cache(struct drm_device *dev,
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uint32_t size)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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uint32_t page_index = bo_page_index(size);
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struct vc4_bo *bo = NULL;
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size = roundup(size, PAGE_SIZE);
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mutex_lock(&vc4->bo_lock);
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if (page_index >= vc4->bo_cache.size_list_size)
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goto out;
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if (list_empty(&vc4->bo_cache.size_list[page_index]))
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goto out;
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bo = list_first_entry(&vc4->bo_cache.size_list[page_index],
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struct vc4_bo, size_head);
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vc4_bo_remove_from_cache(bo);
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kref_init(&bo->base.base.refcount);
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out:
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mutex_unlock(&vc4->bo_lock);
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return bo;
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}
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/**
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* vc4_gem_create_object - Implementation of driver->gem_create_object.
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*
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* This lets the CMA helpers allocate object structs for us, and keep
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* our BO stats correct.
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*/
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struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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struct vc4_bo *bo;
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bo = kzalloc(sizeof(*bo), GFP_KERNEL);
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if (!bo)
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return ERR_PTR(-ENOMEM);
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mutex_lock(&vc4->bo_lock);
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vc4->bo_stats.num_allocated++;
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vc4->bo_stats.size_allocated += size;
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mutex_unlock(&vc4->bo_lock);
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return &bo->base.base;
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}
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struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
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bool from_cache)
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{
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size_t size = roundup(unaligned_size, PAGE_SIZE);
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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struct drm_gem_cma_object *cma_obj;
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if (size == 0)
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return ERR_PTR(-EINVAL);
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/* First, try to get a vc4_bo from the kernel BO cache. */
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if (from_cache) {
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struct vc4_bo *bo = vc4_bo_get_from_cache(dev, size);
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if (bo)
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return bo;
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}
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cma_obj = drm_gem_cma_create(dev, size);
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if (IS_ERR(cma_obj)) {
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/*
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* If we've run out of CMA memory, kill the cache of
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* CMA allocations we've got laying around and try again.
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*/
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vc4_bo_cache_purge(dev);
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cma_obj = drm_gem_cma_create(dev, size);
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if (IS_ERR(cma_obj)) {
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DRM_ERROR("Failed to allocate from CMA:\n");
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vc4_bo_stats_dump(vc4);
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return ERR_PTR(-ENOMEM);
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}
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}
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return to_vc4_bo(&cma_obj->base);
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}
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int vc4_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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struct vc4_bo *bo = NULL;
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int ret;
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if (args->pitch < min_pitch)
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args->pitch = min_pitch;
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if (args->size < args->pitch * args->height)
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args->size = args->pitch * args->height;
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bo = vc4_bo_create(dev, args->size, false);
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if (IS_ERR(bo))
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return PTR_ERR(bo);
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ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
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drm_gem_object_unreference_unlocked(&bo->base.base);
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return ret;
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}
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/* Must be called with bo_lock held. */
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static void vc4_bo_cache_free_old(struct drm_device *dev)
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{
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
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while (!list_empty(&vc4->bo_cache.time_list)) {
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struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
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struct vc4_bo, unref_head);
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if (time_before(expire_time, bo->free_time)) {
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mod_timer(&vc4->bo_cache.time_timer,
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round_jiffies_up(jiffies +
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msecs_to_jiffies(1000)));
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return;
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}
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vc4_bo_remove_from_cache(bo);
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vc4_bo_destroy(bo);
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}
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}
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/* Called on the last userspace/kernel unreference of the BO. Returns
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* it to the BO cache if possible, otherwise frees it.
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*/
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void vc4_free_object(struct drm_gem_object *gem_bo)
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{
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struct drm_device *dev = gem_bo->dev;
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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struct vc4_bo *bo = to_vc4_bo(gem_bo);
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struct list_head *cache_list;
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mutex_lock(&vc4->bo_lock);
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/* If the object references someone else's memory, we can't cache it.
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*/
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if (gem_bo->import_attach) {
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vc4_bo_destroy(bo);
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goto out;
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}
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/* Don't cache if it was publicly named. */
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if (gem_bo->name) {
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vc4_bo_destroy(bo);
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goto out;
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}
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cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
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if (!cache_list) {
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vc4_bo_destroy(bo);
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goto out;
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}
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if (bo->validated_shader) {
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kfree(bo->validated_shader->texture_samples);
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kfree(bo->validated_shader);
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bo->validated_shader = NULL;
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}
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bo->free_time = jiffies;
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list_add(&bo->size_head, cache_list);
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list_add(&bo->unref_head, &vc4->bo_cache.time_list);
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vc4->bo_stats.num_cached++;
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vc4->bo_stats.size_cached += gem_bo->size;
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vc4_bo_cache_free_old(dev);
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out:
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mutex_unlock(&vc4->bo_lock);
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}
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static void vc4_bo_cache_time_work(struct work_struct *work)
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{
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struct vc4_dev *vc4 =
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container_of(work, struct vc4_dev, bo_cache.time_work);
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struct drm_device *dev = vc4->dev;
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mutex_lock(&vc4->bo_lock);
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vc4_bo_cache_free_old(dev);
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mutex_unlock(&vc4->bo_lock);
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}
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static void vc4_bo_cache_time_timer(unsigned long data)
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{
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struct drm_device *dev = (struct drm_device *)data;
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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schedule_work(&vc4->bo_cache.time_work);
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}
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struct dma_buf *
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vc4_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags)
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{
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struct vc4_bo *bo = to_vc4_bo(obj);
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if (bo->validated_shader) {
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DRM_ERROR("Attempting to export shader BO\n");
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return ERR_PTR(-EINVAL);
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}
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return drm_gem_prime_export(dev, obj, flags);
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}
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int vc4_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_gem_object *gem_obj;
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struct vc4_bo *bo;
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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gem_obj = vma->vm_private_data;
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bo = to_vc4_bo(gem_obj);
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if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
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DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
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return -EINVAL;
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}
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/*
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* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
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* vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
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* the whole buffer.
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*/
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_pgoff = 0;
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ret = dma_mmap_wc(bo->base.base.dev->dev, vma, bo->base.vaddr,
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bo->base.paddr, vma->vm_end - vma->vm_start);
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if (ret)
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drm_gem_vm_close(vma);
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return ret;
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}
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int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
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{
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struct vc4_bo *bo = to_vc4_bo(obj);
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if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
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DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
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return -EINVAL;
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}
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return drm_gem_cma_prime_mmap(obj, vma);
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}
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void *vc4_prime_vmap(struct drm_gem_object *obj)
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{
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struct vc4_bo *bo = to_vc4_bo(obj);
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if (bo->validated_shader) {
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DRM_ERROR("mmaping of shader BOs not allowed.\n");
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return ERR_PTR(-EINVAL);
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}
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return drm_gem_cma_prime_vmap(obj);
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}
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int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_vc4_create_bo *args = data;
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struct vc4_bo *bo = NULL;
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int ret;
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/*
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* We can't allocate from the BO cache, because the BOs don't
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* get zeroed, and that might leak data between users.
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*/
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bo = vc4_bo_create(dev, args->size, false);
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if (IS_ERR(bo))
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return PTR_ERR(bo);
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ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
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drm_gem_object_unreference_unlocked(&bo->base.base);
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return ret;
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}
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int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_vc4_mmap_bo *args = data;
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struct drm_gem_object *gem_obj;
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gem_obj = drm_gem_object_lookup(file_priv, args->handle);
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if (!gem_obj) {
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DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
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return -EINVAL;
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}
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/* The mmap offset was set up at BO allocation time. */
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args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
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drm_gem_object_unreference_unlocked(gem_obj);
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return 0;
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}
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int
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vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_vc4_create_shader_bo *args = data;
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struct vc4_bo *bo = NULL;
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int ret;
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if (args->size == 0)
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return -EINVAL;
|
|
|
|
if (args->size % sizeof(u64) != 0)
|
|
return -EINVAL;
|
|
|
|
if (args->flags != 0) {
|
|
DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (args->pad != 0) {
|
|
DRM_INFO("Pad set: 0x%08x\n", args->pad);
|
|
return -EINVAL;
|
|
}
|
|
|
|
bo = vc4_bo_create(dev, args->size, true);
|
|
if (IS_ERR(bo))
|
|
return PTR_ERR(bo);
|
|
|
|
if (copy_from_user(bo->base.vaddr,
|
|
(void __user *)(uintptr_t)args->data,
|
|
args->size)) {
|
|
ret = -EFAULT;
|
|
goto fail;
|
|
}
|
|
/* Clear the rest of the memory from allocating from the BO
|
|
* cache.
|
|
*/
|
|
memset(bo->base.vaddr + args->size, 0,
|
|
bo->base.base.size - args->size);
|
|
|
|
bo->validated_shader = vc4_validate_shader(&bo->base);
|
|
if (!bo->validated_shader) {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
/* We have to create the handle after validation, to avoid
|
|
* races for users to do doing things like mmap the shader BO.
|
|
*/
|
|
ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
|
|
|
|
fail:
|
|
drm_gem_object_unreference_unlocked(&bo->base.base);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void vc4_bo_cache_init(struct drm_device *dev)
|
|
{
|
|
struct vc4_dev *vc4 = to_vc4_dev(dev);
|
|
|
|
mutex_init(&vc4->bo_lock);
|
|
|
|
INIT_LIST_HEAD(&vc4->bo_cache.time_list);
|
|
|
|
INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
|
|
setup_timer(&vc4->bo_cache.time_timer,
|
|
vc4_bo_cache_time_timer,
|
|
(unsigned long)dev);
|
|
}
|
|
|
|
void vc4_bo_cache_destroy(struct drm_device *dev)
|
|
{
|
|
struct vc4_dev *vc4 = to_vc4_dev(dev);
|
|
|
|
del_timer(&vc4->bo_cache.time_timer);
|
|
cancel_work_sync(&vc4->bo_cache.time_work);
|
|
|
|
vc4_bo_cache_purge(dev);
|
|
|
|
if (vc4->bo_stats.num_allocated) {
|
|
DRM_ERROR("Destroying BO cache while BOs still allocated:\n");
|
|
vc4_bo_stats_dump(vc4);
|
|
}
|
|
}
|