mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 05:45:13 +07:00
758d90e161
There are multiple places where arrays or otherwise variable sized buffer are allocated through V4L2 core code, including things like controls, memory pages, staging buffers for ioctls and so on. Such allocations can potentially require an order > 0 allocation from the page allocator, which is not guaranteed to be fulfilled and is likely to fail on a system with severe memory fragmentation (e.g. a system with very long uptime). Since the memory being allocated is intended to be used by the CPU exclusively, we can consider using vmalloc() as a fallback and this is exactly what the recently merged kvmalloc() helpers do. A kmalloc() call is still attempted, even for order > 0 allocations, but it is done with __GFP_NORETRY and __GFP_NOWARN, with expectation of failing if requested memory is not available instantly. Only then the vmalloc() fallback is used. This should give us fast and more reliable allocations even on systems with higher memory pressure and/or more fragmentation, while still retaining the same performance level on systems not suffering from such conditions. While at it, replace explicit array size calculations on changed allocations with kvmalloc_array(). Purposedly not touching videobuf1, as it is deprecated, has only few users remaining and would rather be seen removed instead. Signed-off-by: Tomasz Figa <tfiga@chromium.org> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
669 lines
16 KiB
C
669 lines
16 KiB
C
/*
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* videobuf2-dma-sg.c - dma scatter/gather memory allocator for videobuf2
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
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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 as published by
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* the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/refcount.h>
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#include <linux/scatterlist.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/videobuf2-memops.h>
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#include <media/videobuf2-dma-sg.h>
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static int debug;
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module_param(debug, int, 0644);
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#define dprintk(level, fmt, arg...) \
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do { \
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if (debug >= level) \
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printk(KERN_DEBUG "vb2-dma-sg: " fmt, ## arg); \
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} while (0)
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struct vb2_dma_sg_buf {
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struct device *dev;
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void *vaddr;
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struct page **pages;
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struct frame_vector *vec;
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int offset;
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enum dma_data_direction dma_dir;
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struct sg_table sg_table;
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/*
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* This will point to sg_table when used with the MMAP or USERPTR
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* memory model, and to the dma_buf sglist when used with the
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* DMABUF memory model.
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*/
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struct sg_table *dma_sgt;
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size_t size;
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unsigned int num_pages;
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refcount_t refcount;
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struct vb2_vmarea_handler handler;
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struct dma_buf_attachment *db_attach;
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};
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static void vb2_dma_sg_put(void *buf_priv);
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static int vb2_dma_sg_alloc_compacted(struct vb2_dma_sg_buf *buf,
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gfp_t gfp_flags)
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{
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unsigned int last_page = 0;
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int size = buf->size;
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while (size > 0) {
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struct page *pages;
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int order;
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int i;
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order = get_order(size);
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/* Dont over allocate*/
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if ((PAGE_SIZE << order) > size)
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order--;
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pages = NULL;
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while (!pages) {
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pages = alloc_pages(GFP_KERNEL | __GFP_ZERO |
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__GFP_NOWARN | gfp_flags, order);
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if (pages)
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break;
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if (order == 0) {
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while (last_page--)
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__free_page(buf->pages[last_page]);
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return -ENOMEM;
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}
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order--;
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}
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split_page(pages, order);
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for (i = 0; i < (1 << order); i++)
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buf->pages[last_page++] = &pages[i];
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size -= PAGE_SIZE << order;
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}
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return 0;
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}
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static void *vb2_dma_sg_alloc(struct device *dev, unsigned long dma_attrs,
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unsigned long size, enum dma_data_direction dma_dir,
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gfp_t gfp_flags)
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{
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struct vb2_dma_sg_buf *buf;
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struct sg_table *sgt;
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int ret;
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int num_pages;
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if (WARN_ON(!dev))
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return ERR_PTR(-EINVAL);
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buf = kzalloc(sizeof *buf, GFP_KERNEL);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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buf->vaddr = NULL;
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buf->dma_dir = dma_dir;
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buf->offset = 0;
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buf->size = size;
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/* size is already page aligned */
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buf->num_pages = size >> PAGE_SHIFT;
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buf->dma_sgt = &buf->sg_table;
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buf->pages = kvmalloc_array(buf->num_pages, sizeof(struct page *),
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GFP_KERNEL | __GFP_ZERO);
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if (!buf->pages)
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goto fail_pages_array_alloc;
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ret = vb2_dma_sg_alloc_compacted(buf, gfp_flags);
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if (ret)
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goto fail_pages_alloc;
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ret = sg_alloc_table_from_pages(buf->dma_sgt, buf->pages,
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buf->num_pages, 0, size, GFP_KERNEL);
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if (ret)
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goto fail_table_alloc;
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/* Prevent the device from being released while the buffer is used */
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buf->dev = get_device(dev);
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sgt = &buf->sg_table;
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/*
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* No need to sync to the device, this will happen later when the
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* prepare() memop is called.
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*/
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sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
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buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
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if (!sgt->nents)
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goto fail_map;
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buf->handler.refcount = &buf->refcount;
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buf->handler.put = vb2_dma_sg_put;
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buf->handler.arg = buf;
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refcount_set(&buf->refcount, 1);
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dprintk(1, "%s: Allocated buffer of %d pages\n",
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__func__, buf->num_pages);
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return buf;
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fail_map:
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put_device(buf->dev);
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sg_free_table(buf->dma_sgt);
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fail_table_alloc:
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num_pages = buf->num_pages;
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while (num_pages--)
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__free_page(buf->pages[num_pages]);
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fail_pages_alloc:
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kvfree(buf->pages);
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fail_pages_array_alloc:
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kfree(buf);
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return ERR_PTR(-ENOMEM);
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}
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static void vb2_dma_sg_put(void *buf_priv)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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struct sg_table *sgt = &buf->sg_table;
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int i = buf->num_pages;
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if (refcount_dec_and_test(&buf->refcount)) {
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dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
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buf->num_pages);
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dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
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buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
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if (buf->vaddr)
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vm_unmap_ram(buf->vaddr, buf->num_pages);
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sg_free_table(buf->dma_sgt);
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while (--i >= 0)
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__free_page(buf->pages[i]);
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kvfree(buf->pages);
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put_device(buf->dev);
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kfree(buf);
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}
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}
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static void vb2_dma_sg_prepare(void *buf_priv)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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struct sg_table *sgt = buf->dma_sgt;
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/* DMABUF exporter will flush the cache for us */
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if (buf->db_attach)
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return;
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dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->orig_nents,
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buf->dma_dir);
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}
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static void vb2_dma_sg_finish(void *buf_priv)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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struct sg_table *sgt = buf->dma_sgt;
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/* DMABUF exporter will flush the cache for us */
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if (buf->db_attach)
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return;
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dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir);
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}
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static void *vb2_dma_sg_get_userptr(struct device *dev, unsigned long vaddr,
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unsigned long size,
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enum dma_data_direction dma_dir)
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{
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struct vb2_dma_sg_buf *buf;
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struct sg_table *sgt;
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struct frame_vector *vec;
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if (WARN_ON(!dev))
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return ERR_PTR(-EINVAL);
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buf = kzalloc(sizeof *buf, GFP_KERNEL);
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if (!buf)
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return ERR_PTR(-ENOMEM);
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buf->vaddr = NULL;
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buf->dev = dev;
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buf->dma_dir = dma_dir;
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buf->offset = vaddr & ~PAGE_MASK;
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buf->size = size;
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buf->dma_sgt = &buf->sg_table;
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vec = vb2_create_framevec(vaddr, size, buf->dma_dir == DMA_FROM_DEVICE);
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if (IS_ERR(vec))
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goto userptr_fail_pfnvec;
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buf->vec = vec;
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buf->pages = frame_vector_pages(vec);
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if (IS_ERR(buf->pages))
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goto userptr_fail_sgtable;
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buf->num_pages = frame_vector_count(vec);
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if (sg_alloc_table_from_pages(buf->dma_sgt, buf->pages,
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buf->num_pages, buf->offset, size, 0))
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goto userptr_fail_sgtable;
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sgt = &buf->sg_table;
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/*
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* No need to sync to the device, this will happen later when the
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* prepare() memop is called.
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*/
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sgt->nents = dma_map_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents,
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buf->dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
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if (!sgt->nents)
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goto userptr_fail_map;
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return buf;
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userptr_fail_map:
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sg_free_table(&buf->sg_table);
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userptr_fail_sgtable:
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vb2_destroy_framevec(vec);
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userptr_fail_pfnvec:
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kfree(buf);
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return ERR_PTR(-ENOMEM);
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}
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/*
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* @put_userptr: inform the allocator that a USERPTR buffer will no longer
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* be used
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*/
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static void vb2_dma_sg_put_userptr(void *buf_priv)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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struct sg_table *sgt = &buf->sg_table;
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int i = buf->num_pages;
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dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
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__func__, buf->num_pages);
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dma_unmap_sg_attrs(buf->dev, sgt->sgl, sgt->orig_nents, buf->dma_dir,
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DMA_ATTR_SKIP_CPU_SYNC);
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if (buf->vaddr)
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vm_unmap_ram(buf->vaddr, buf->num_pages);
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sg_free_table(buf->dma_sgt);
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while (--i >= 0) {
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if (buf->dma_dir == DMA_FROM_DEVICE)
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set_page_dirty_lock(buf->pages[i]);
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}
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vb2_destroy_framevec(buf->vec);
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kfree(buf);
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}
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static void *vb2_dma_sg_vaddr(void *buf_priv)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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BUG_ON(!buf);
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if (!buf->vaddr) {
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if (buf->db_attach)
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buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf);
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else
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buf->vaddr = vm_map_ram(buf->pages,
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buf->num_pages, -1, PAGE_KERNEL);
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}
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/* add offset in case userptr is not page-aligned */
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return buf->vaddr ? buf->vaddr + buf->offset : NULL;
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}
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static unsigned int vb2_dma_sg_num_users(void *buf_priv)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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return refcount_read(&buf->refcount);
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}
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static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma)
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{
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struct vb2_dma_sg_buf *buf = buf_priv;
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unsigned long uaddr = vma->vm_start;
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unsigned long usize = vma->vm_end - vma->vm_start;
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int i = 0;
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if (!buf) {
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printk(KERN_ERR "No memory to map\n");
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return -EINVAL;
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}
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do {
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int ret;
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ret = vm_insert_page(vma, uaddr, buf->pages[i++]);
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if (ret) {
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printk(KERN_ERR "Remapping memory, error: %d\n", ret);
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return ret;
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}
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uaddr += PAGE_SIZE;
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usize -= PAGE_SIZE;
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} while (usize > 0);
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/*
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* Use common vm_area operations to track buffer refcount.
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*/
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vma->vm_private_data = &buf->handler;
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vma->vm_ops = &vb2_common_vm_ops;
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vma->vm_ops->open(vma);
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return 0;
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}
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/*********************************************/
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/* DMABUF ops for exporters */
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/*********************************************/
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struct vb2_dma_sg_attachment {
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struct sg_table sgt;
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enum dma_data_direction dma_dir;
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};
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static int vb2_dma_sg_dmabuf_ops_attach(struct dma_buf *dbuf, struct device *dev,
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struct dma_buf_attachment *dbuf_attach)
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{
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struct vb2_dma_sg_attachment *attach;
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unsigned int i;
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struct scatterlist *rd, *wr;
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struct sg_table *sgt;
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struct vb2_dma_sg_buf *buf = dbuf->priv;
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int ret;
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attach = kzalloc(sizeof(*attach), GFP_KERNEL);
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if (!attach)
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return -ENOMEM;
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sgt = &attach->sgt;
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/* Copy the buf->base_sgt scatter list to the attachment, as we can't
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* map the same scatter list to multiple attachments at the same time.
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*/
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ret = sg_alloc_table(sgt, buf->dma_sgt->orig_nents, GFP_KERNEL);
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if (ret) {
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kfree(attach);
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return -ENOMEM;
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}
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rd = buf->dma_sgt->sgl;
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wr = sgt->sgl;
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for (i = 0; i < sgt->orig_nents; ++i) {
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sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
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rd = sg_next(rd);
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wr = sg_next(wr);
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}
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attach->dma_dir = DMA_NONE;
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dbuf_attach->priv = attach;
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return 0;
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}
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static void vb2_dma_sg_dmabuf_ops_detach(struct dma_buf *dbuf,
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struct dma_buf_attachment *db_attach)
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{
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struct vb2_dma_sg_attachment *attach = db_attach->priv;
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struct sg_table *sgt;
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if (!attach)
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return;
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sgt = &attach->sgt;
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/* release the scatterlist cache */
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if (attach->dma_dir != DMA_NONE)
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dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
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attach->dma_dir);
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sg_free_table(sgt);
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kfree(attach);
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db_attach->priv = NULL;
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}
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static struct sg_table *vb2_dma_sg_dmabuf_ops_map(
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struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
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{
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struct vb2_dma_sg_attachment *attach = db_attach->priv;
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/* stealing dmabuf mutex to serialize map/unmap operations */
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struct mutex *lock = &db_attach->dmabuf->lock;
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struct sg_table *sgt;
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mutex_lock(lock);
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sgt = &attach->sgt;
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/* return previously mapped sg table */
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if (attach->dma_dir == dma_dir) {
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mutex_unlock(lock);
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return sgt;
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}
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|
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/* release any previous cache */
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if (attach->dma_dir != DMA_NONE) {
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dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
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attach->dma_dir);
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attach->dma_dir = DMA_NONE;
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}
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|
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/* mapping to the client with new direction */
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sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
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dma_dir);
|
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if (!sgt->nents) {
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pr_err("failed to map scatterlist\n");
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mutex_unlock(lock);
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return ERR_PTR(-EIO);
|
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}
|
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|
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attach->dma_dir = dma_dir;
|
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|
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mutex_unlock(lock);
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|
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return sgt;
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}
|
|
|
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static void vb2_dma_sg_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach,
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struct sg_table *sgt, enum dma_data_direction dma_dir)
|
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{
|
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/* nothing to be done here */
|
|
}
|
|
|
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static void vb2_dma_sg_dmabuf_ops_release(struct dma_buf *dbuf)
|
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{
|
|
/* drop reference obtained in vb2_dma_sg_get_dmabuf */
|
|
vb2_dma_sg_put(dbuf->priv);
|
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}
|
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|
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static void *vb2_dma_sg_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = dbuf->priv;
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|
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return buf->vaddr ? buf->vaddr + pgnum * PAGE_SIZE : NULL;
|
|
}
|
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|
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static void *vb2_dma_sg_dmabuf_ops_vmap(struct dma_buf *dbuf)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = dbuf->priv;
|
|
|
|
return vb2_dma_sg_vaddr(buf);
|
|
}
|
|
|
|
static int vb2_dma_sg_dmabuf_ops_mmap(struct dma_buf *dbuf,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return vb2_dma_sg_mmap(dbuf->priv, vma);
|
|
}
|
|
|
|
static struct dma_buf_ops vb2_dma_sg_dmabuf_ops = {
|
|
.attach = vb2_dma_sg_dmabuf_ops_attach,
|
|
.detach = vb2_dma_sg_dmabuf_ops_detach,
|
|
.map_dma_buf = vb2_dma_sg_dmabuf_ops_map,
|
|
.unmap_dma_buf = vb2_dma_sg_dmabuf_ops_unmap,
|
|
.map = vb2_dma_sg_dmabuf_ops_kmap,
|
|
.map_atomic = vb2_dma_sg_dmabuf_ops_kmap,
|
|
.vmap = vb2_dma_sg_dmabuf_ops_vmap,
|
|
.mmap = vb2_dma_sg_dmabuf_ops_mmap,
|
|
.release = vb2_dma_sg_dmabuf_ops_release,
|
|
};
|
|
|
|
static struct dma_buf *vb2_dma_sg_get_dmabuf(void *buf_priv, unsigned long flags)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = buf_priv;
|
|
struct dma_buf *dbuf;
|
|
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
|
|
|
|
exp_info.ops = &vb2_dma_sg_dmabuf_ops;
|
|
exp_info.size = buf->size;
|
|
exp_info.flags = flags;
|
|
exp_info.priv = buf;
|
|
|
|
if (WARN_ON(!buf->dma_sgt))
|
|
return NULL;
|
|
|
|
dbuf = dma_buf_export(&exp_info);
|
|
if (IS_ERR(dbuf))
|
|
return NULL;
|
|
|
|
/* dmabuf keeps reference to vb2 buffer */
|
|
refcount_inc(&buf->refcount);
|
|
|
|
return dbuf;
|
|
}
|
|
|
|
/*********************************************/
|
|
/* callbacks for DMABUF buffers */
|
|
/*********************************************/
|
|
|
|
static int vb2_dma_sg_map_dmabuf(void *mem_priv)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = mem_priv;
|
|
struct sg_table *sgt;
|
|
|
|
if (WARN_ON(!buf->db_attach)) {
|
|
pr_err("trying to pin a non attached buffer\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (WARN_ON(buf->dma_sgt)) {
|
|
pr_err("dmabuf buffer is already pinned\n");
|
|
return 0;
|
|
}
|
|
|
|
/* get the associated scatterlist for this buffer */
|
|
sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir);
|
|
if (IS_ERR(sgt)) {
|
|
pr_err("Error getting dmabuf scatterlist\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
buf->dma_sgt = sgt;
|
|
buf->vaddr = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vb2_dma_sg_unmap_dmabuf(void *mem_priv)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = mem_priv;
|
|
struct sg_table *sgt = buf->dma_sgt;
|
|
|
|
if (WARN_ON(!buf->db_attach)) {
|
|
pr_err("trying to unpin a not attached buffer\n");
|
|
return;
|
|
}
|
|
|
|
if (WARN_ON(!sgt)) {
|
|
pr_err("dmabuf buffer is already unpinned\n");
|
|
return;
|
|
}
|
|
|
|
if (buf->vaddr) {
|
|
dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr);
|
|
buf->vaddr = NULL;
|
|
}
|
|
dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir);
|
|
|
|
buf->dma_sgt = NULL;
|
|
}
|
|
|
|
static void vb2_dma_sg_detach_dmabuf(void *mem_priv)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = mem_priv;
|
|
|
|
/* if vb2 works correctly you should never detach mapped buffer */
|
|
if (WARN_ON(buf->dma_sgt))
|
|
vb2_dma_sg_unmap_dmabuf(buf);
|
|
|
|
/* detach this attachment */
|
|
dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach);
|
|
kfree(buf);
|
|
}
|
|
|
|
static void *vb2_dma_sg_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
|
|
unsigned long size, enum dma_data_direction dma_dir)
|
|
{
|
|
struct vb2_dma_sg_buf *buf;
|
|
struct dma_buf_attachment *dba;
|
|
|
|
if (WARN_ON(!dev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (dbuf->size < size)
|
|
return ERR_PTR(-EFAULT);
|
|
|
|
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
|
|
if (!buf)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
buf->dev = dev;
|
|
/* create attachment for the dmabuf with the user device */
|
|
dba = dma_buf_attach(dbuf, buf->dev);
|
|
if (IS_ERR(dba)) {
|
|
pr_err("failed to attach dmabuf\n");
|
|
kfree(buf);
|
|
return dba;
|
|
}
|
|
|
|
buf->dma_dir = dma_dir;
|
|
buf->size = size;
|
|
buf->db_attach = dba;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static void *vb2_dma_sg_cookie(void *buf_priv)
|
|
{
|
|
struct vb2_dma_sg_buf *buf = buf_priv;
|
|
|
|
return buf->dma_sgt;
|
|
}
|
|
|
|
const struct vb2_mem_ops vb2_dma_sg_memops = {
|
|
.alloc = vb2_dma_sg_alloc,
|
|
.put = vb2_dma_sg_put,
|
|
.get_userptr = vb2_dma_sg_get_userptr,
|
|
.put_userptr = vb2_dma_sg_put_userptr,
|
|
.prepare = vb2_dma_sg_prepare,
|
|
.finish = vb2_dma_sg_finish,
|
|
.vaddr = vb2_dma_sg_vaddr,
|
|
.mmap = vb2_dma_sg_mmap,
|
|
.num_users = vb2_dma_sg_num_users,
|
|
.get_dmabuf = vb2_dma_sg_get_dmabuf,
|
|
.map_dmabuf = vb2_dma_sg_map_dmabuf,
|
|
.unmap_dmabuf = vb2_dma_sg_unmap_dmabuf,
|
|
.attach_dmabuf = vb2_dma_sg_attach_dmabuf,
|
|
.detach_dmabuf = vb2_dma_sg_detach_dmabuf,
|
|
.cookie = vb2_dma_sg_cookie,
|
|
};
|
|
EXPORT_SYMBOL_GPL(vb2_dma_sg_memops);
|
|
|
|
MODULE_DESCRIPTION("dma scatter/gather memory handling routines for videobuf2");
|
|
MODULE_AUTHOR("Andrzej Pietrasiewicz");
|
|
MODULE_LICENSE("GPL");
|