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![John Stultz](/assets/img/avatar_default.png)
While the system heap can return non-contiguous pages, try to allocate larger order pages if possible. This will allow slight performance gains and make implementing page pooling easier. Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Liam Mark <lmark@codeaurora.org> Cc: Laura Abbott <labbott@kernel.org> Cc: Brian Starkey <Brian.Starkey@arm.com> Cc: Hridya Valsaraju <hridya@google.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Sandeep Patil <sspatil@google.com> Cc: Daniel Mentz <danielmentz@google.com> Cc: Chris Goldsworthy <cgoldswo@codeaurora.org> Cc: Ørjan Eide <orjan.eide@arm.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Ezequiel Garcia <ezequiel@collabora.com> Cc: Simon Ser <contact@emersion.fr> Cc: James Jones <jajones@nvidia.com> Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Reviewed-by: Brian Starkey <brian.starkey@arm.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20201121235002.69945-6-john.stultz@linaro.org
443 lines
10 KiB
C
443 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* DMABUF System heap exporter
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*
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* Copyright (C) 2011 Google, Inc.
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* Copyright (C) 2019, 2020 Linaro Ltd.
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*
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* Portions based off of Andrew Davis' SRAM heap:
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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* Andrew F. Davis <afd@ti.com>
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*/
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#include <linux/dma-buf.h>
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#include <linux/dma-mapping.h>
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#include <linux/dma-heap.h>
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#include <linux/err.h>
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#include <linux/highmem.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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static struct dma_heap *sys_heap;
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struct system_heap_buffer {
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struct dma_heap *heap;
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struct list_head attachments;
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struct mutex lock;
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unsigned long len;
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struct sg_table sg_table;
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int vmap_cnt;
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void *vaddr;
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};
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struct dma_heap_attachment {
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struct device *dev;
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struct sg_table *table;
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struct list_head list;
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bool mapped;
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};
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#define HIGH_ORDER_GFP (((GFP_HIGHUSER | __GFP_ZERO | __GFP_NOWARN \
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| __GFP_NORETRY) & ~__GFP_RECLAIM) \
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| __GFP_COMP)
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#define LOW_ORDER_GFP (GFP_HIGHUSER | __GFP_ZERO | __GFP_COMP)
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static gfp_t order_flags[] = {HIGH_ORDER_GFP, LOW_ORDER_GFP, LOW_ORDER_GFP};
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/*
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* The selection of the orders used for allocation (1MB, 64K, 4K) is designed
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* to match with the sizes often found in IOMMUs. Using order 4 pages instead
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* of order 0 pages can significantly improve the performance of many IOMMUs
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* by reducing TLB pressure and time spent updating page tables.
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*/
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static const unsigned int orders[] = {8, 4, 0};
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#define NUM_ORDERS ARRAY_SIZE(orders)
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static struct sg_table *dup_sg_table(struct sg_table *table)
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{
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struct sg_table *new_table;
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int ret, i;
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struct scatterlist *sg, *new_sg;
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new_table = kzalloc(sizeof(*new_table), GFP_KERNEL);
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if (!new_table)
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return ERR_PTR(-ENOMEM);
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ret = sg_alloc_table(new_table, table->orig_nents, GFP_KERNEL);
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if (ret) {
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kfree(new_table);
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return ERR_PTR(-ENOMEM);
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}
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new_sg = new_table->sgl;
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for_each_sgtable_sg(table, sg, i) {
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sg_set_page(new_sg, sg_page(sg), sg->length, sg->offset);
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new_sg = sg_next(new_sg);
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}
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return new_table;
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}
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static int system_heap_attach(struct dma_buf *dmabuf,
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struct dma_buf_attachment *attachment)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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struct dma_heap_attachment *a;
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struct sg_table *table;
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a = kzalloc(sizeof(*a), GFP_KERNEL);
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if (!a)
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return -ENOMEM;
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table = dup_sg_table(&buffer->sg_table);
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if (IS_ERR(table)) {
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kfree(a);
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return -ENOMEM;
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}
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a->table = table;
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a->dev = attachment->dev;
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INIT_LIST_HEAD(&a->list);
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a->mapped = false;
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attachment->priv = a;
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mutex_lock(&buffer->lock);
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list_add(&a->list, &buffer->attachments);
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mutex_unlock(&buffer->lock);
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return 0;
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}
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static void system_heap_detach(struct dma_buf *dmabuf,
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struct dma_buf_attachment *attachment)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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struct dma_heap_attachment *a = attachment->priv;
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mutex_lock(&buffer->lock);
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list_del(&a->list);
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mutex_unlock(&buffer->lock);
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sg_free_table(a->table);
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kfree(a->table);
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kfree(a);
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}
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static struct sg_table *system_heap_map_dma_buf(struct dma_buf_attachment *attachment,
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enum dma_data_direction direction)
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{
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struct dma_heap_attachment *a = attachment->priv;
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struct sg_table *table = a->table;
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int ret;
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ret = dma_map_sgtable(attachment->dev, table, direction, 0);
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if (ret)
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return ERR_PTR(ret);
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a->mapped = true;
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return table;
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}
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static void system_heap_unmap_dma_buf(struct dma_buf_attachment *attachment,
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struct sg_table *table,
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enum dma_data_direction direction)
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{
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struct dma_heap_attachment *a = attachment->priv;
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a->mapped = false;
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dma_unmap_sgtable(attachment->dev, table, direction, 0);
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}
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static int system_heap_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
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enum dma_data_direction direction)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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struct dma_heap_attachment *a;
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mutex_lock(&buffer->lock);
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if (buffer->vmap_cnt)
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invalidate_kernel_vmap_range(buffer->vaddr, buffer->len);
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list_for_each_entry(a, &buffer->attachments, list) {
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if (!a->mapped)
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continue;
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dma_sync_sgtable_for_cpu(a->dev, a->table, direction);
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}
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mutex_unlock(&buffer->lock);
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return 0;
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}
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static int system_heap_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
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enum dma_data_direction direction)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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struct dma_heap_attachment *a;
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mutex_lock(&buffer->lock);
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if (buffer->vmap_cnt)
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flush_kernel_vmap_range(buffer->vaddr, buffer->len);
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list_for_each_entry(a, &buffer->attachments, list) {
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if (!a->mapped)
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continue;
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dma_sync_sgtable_for_device(a->dev, a->table, direction);
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}
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mutex_unlock(&buffer->lock);
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return 0;
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}
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static int system_heap_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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struct sg_table *table = &buffer->sg_table;
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unsigned long addr = vma->vm_start;
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struct sg_page_iter piter;
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int ret;
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for_each_sgtable_page(table, &piter, vma->vm_pgoff) {
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struct page *page = sg_page_iter_page(&piter);
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ret = remap_pfn_range(vma, addr, page_to_pfn(page), PAGE_SIZE,
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vma->vm_page_prot);
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if (ret)
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return ret;
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addr += PAGE_SIZE;
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if (addr >= vma->vm_end)
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return 0;
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}
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return 0;
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}
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static void *system_heap_do_vmap(struct system_heap_buffer *buffer)
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{
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struct sg_table *table = &buffer->sg_table;
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int npages = PAGE_ALIGN(buffer->len) / PAGE_SIZE;
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struct page **pages = vmalloc(sizeof(struct page *) * npages);
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struct page **tmp = pages;
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struct sg_page_iter piter;
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void *vaddr;
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if (!pages)
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return ERR_PTR(-ENOMEM);
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for_each_sgtable_page(table, &piter, 0) {
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WARN_ON(tmp - pages >= npages);
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*tmp++ = sg_page_iter_page(&piter);
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}
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vaddr = vmap(pages, npages, VM_MAP, PAGE_KERNEL);
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vfree(pages);
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if (!vaddr)
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return ERR_PTR(-ENOMEM);
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return vaddr;
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}
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static int system_heap_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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void *vaddr;
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int ret = 0;
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mutex_lock(&buffer->lock);
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if (buffer->vmap_cnt) {
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buffer->vmap_cnt++;
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dma_buf_map_set_vaddr(map, buffer->vaddr);
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goto out;
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}
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vaddr = system_heap_do_vmap(buffer);
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if (IS_ERR(vaddr)) {
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ret = PTR_ERR(vaddr);
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goto out;
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}
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buffer->vaddr = vaddr;
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buffer->vmap_cnt++;
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dma_buf_map_set_vaddr(map, buffer->vaddr);
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out:
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mutex_unlock(&buffer->lock);
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return ret;
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}
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static void system_heap_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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mutex_lock(&buffer->lock);
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if (!--buffer->vmap_cnt) {
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vunmap(buffer->vaddr);
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buffer->vaddr = NULL;
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}
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mutex_unlock(&buffer->lock);
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dma_buf_map_clear(map);
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}
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static void system_heap_dma_buf_release(struct dma_buf *dmabuf)
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{
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struct system_heap_buffer *buffer = dmabuf->priv;
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struct sg_table *table;
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struct scatterlist *sg;
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int i;
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table = &buffer->sg_table;
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for_each_sg(table->sgl, sg, table->nents, i) {
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struct page *page = sg_page(sg);
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__free_pages(page, compound_order(page));
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}
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sg_free_table(table);
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kfree(buffer);
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}
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static const struct dma_buf_ops system_heap_buf_ops = {
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.attach = system_heap_attach,
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.detach = system_heap_detach,
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.map_dma_buf = system_heap_map_dma_buf,
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.unmap_dma_buf = system_heap_unmap_dma_buf,
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.begin_cpu_access = system_heap_dma_buf_begin_cpu_access,
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.end_cpu_access = system_heap_dma_buf_end_cpu_access,
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.mmap = system_heap_mmap,
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.vmap = system_heap_vmap,
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.vunmap = system_heap_vunmap,
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.release = system_heap_dma_buf_release,
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};
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static struct page *alloc_largest_available(unsigned long size,
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unsigned int max_order)
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{
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struct page *page;
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int i;
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for (i = 0; i < NUM_ORDERS; i++) {
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if (size < (PAGE_SIZE << orders[i]))
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continue;
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if (max_order < orders[i])
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continue;
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page = alloc_pages(order_flags[i], orders[i]);
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if (!page)
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continue;
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return page;
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}
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return NULL;
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}
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static int system_heap_allocate(struct dma_heap *heap,
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unsigned long len,
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unsigned long fd_flags,
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unsigned long heap_flags)
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{
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struct system_heap_buffer *buffer;
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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unsigned long size_remaining = len;
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unsigned int max_order = orders[0];
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struct dma_buf *dmabuf;
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struct sg_table *table;
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struct scatterlist *sg;
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struct list_head pages;
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struct page *page, *tmp_page;
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int i, ret = -ENOMEM;
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
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INIT_LIST_HEAD(&buffer->attachments);
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mutex_init(&buffer->lock);
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buffer->heap = heap;
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buffer->len = len;
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INIT_LIST_HEAD(&pages);
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i = 0;
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while (size_remaining > 0) {
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/*
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* Avoid trying to allocate memory if the process
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* has been killed by SIGKILL
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*/
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if (fatal_signal_pending(current))
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goto free_buffer;
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page = alloc_largest_available(size_remaining, max_order);
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if (!page)
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goto free_buffer;
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list_add_tail(&page->lru, &pages);
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size_remaining -= page_size(page);
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max_order = compound_order(page);
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i++;
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}
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table = &buffer->sg_table;
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if (sg_alloc_table(table, i, GFP_KERNEL))
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goto free_buffer;
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sg = table->sgl;
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list_for_each_entry_safe(page, tmp_page, &pages, lru) {
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sg_set_page(sg, page, page_size(page), 0);
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sg = sg_next(sg);
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list_del(&page->lru);
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}
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/* create the dmabuf */
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exp_info.ops = &system_heap_buf_ops;
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exp_info.size = buffer->len;
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exp_info.flags = fd_flags;
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exp_info.priv = buffer;
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dmabuf = dma_buf_export(&exp_info);
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if (IS_ERR(dmabuf)) {
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ret = PTR_ERR(dmabuf);
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goto free_pages;
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}
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ret = dma_buf_fd(dmabuf, fd_flags);
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if (ret < 0) {
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dma_buf_put(dmabuf);
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/* just return, as put will call release and that will free */
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return ret;
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}
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return ret;
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free_pages:
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for_each_sgtable_sg(table, sg, i) {
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struct page *p = sg_page(sg);
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__free_pages(p, compound_order(p));
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}
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sg_free_table(table);
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free_buffer:
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list_for_each_entry_safe(page, tmp_page, &pages, lru)
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__free_pages(page, compound_order(page));
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kfree(buffer);
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return ret;
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}
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static const struct dma_heap_ops system_heap_ops = {
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.allocate = system_heap_allocate,
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};
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static int system_heap_create(void)
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{
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struct dma_heap_export_info exp_info;
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exp_info.name = "system";
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exp_info.ops = &system_heap_ops;
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exp_info.priv = NULL;
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sys_heap = dma_heap_add(&exp_info);
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if (IS_ERR(sys_heap))
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return PTR_ERR(sys_heap);
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return 0;
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}
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module_init(system_heap_create);
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MODULE_LICENSE("GPL v2");
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