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From: John Stultz <john.stultz@linaro.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Hyesoo Yu <hyesoo.yu@samsung.com>,
	david@redhat.com, Michal Hocko <mhocko@suse.com>,
	Suren Baghdasaryan <surenb@google.com>,
	KyongHo Cho <pullip.cho@samsung.com>,
	John Dias <joaodias@google.com>,
	Hridya Valsaraju <hridya@google.com>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	linux-media <linux-media@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	Rob Herring <robh+dt@kernel.org>,
	"moderated list:DMA BUFFER SHARING FRAMEWORK" 
	<linaro-mm-sig@lists.linaro.org>
Subject: Re: [PATCH v4 4/4] dma-buf: heaps: add chunk heap to dmabuf heaps
Date: Mon, 25 Jan 2021 23:32:57 -0800
Message-ID: <CALAqxLWJDo=pM8bvt9YWrzJ+VyK5gojoL-v7ch1fQC=cjGwJOw@mail.gmail.com> (raw)
In-Reply-To: <20210121175502.274391-5-minchan@kernel.org>

On Thu, Jan 21, 2021 at 9:55 AM Minchan Kim <minchan@kernel.org> wrote:

Hey Minchan,
  Thanks for sending this out! I'm still working through testing with
this patch set, so I may have some more feedback tomorrow, but a few
quick items I did hit below.

> +
> +#define CHUNK_PREFIX "chunk-"
> +
> +static int register_chunk_heap(struct chunk_heap *chunk_heap_info)
> +{
> +       struct dma_heap_export_info exp_info;
> +       const char *name = cma_get_name(chunk_heap_info->cma);
> +       size_t len = strlen(CHUNK_PREFIX) + strlen(name) + 1;
> +       char *buf = kmalloc(len, GFP_KERNEL);
> +
> +       if (!buf)
> +               return -ENOMEM;
> +
> +       sprintf(buf, CHUNK_PREFIX"%s", cma_get_name(chunk_heap_info->cma));
> +       buf[len] = '\0';
> +
> +       exp_info.name = buf;
> +       exp_info.name = cma_get_name(chunk_heap_info->cma);

I think you intended to delete this line, as it's overwriting your
prefixed name.

> +       exp_info.ops = &chunk_heap_ops;
> +       exp_info.priv = chunk_heap_info;
> +
> +       chunk_heap_info->heap = dma_heap_add(&exp_info);
> +       if (IS_ERR(chunk_heap_info->heap)) {
> +               kfree(buf);
> +               return PTR_ERR(chunk_heap_info->heap);
> +       }
> +
> +       return 0;
> +}
> +
> +static int __init chunk_heap_init(void)
> +{
> +       unsigned int i;
> +
> +       for (i = 0; i < chunk_heap_count; i++)
> +               register_chunk_heap(&chunk_heaps[i]);
> +
> +       return 0;
> +}
> +module_init(chunk_heap_init);
> +
> +#ifdef CONFIG_OF_EARLY_FLATTREE
> +
> +static int __init dmabuf_chunk_heap_area_init(struct reserved_mem *rmem)
> +{
> +       int ret;
> +       struct cma *cma;
> +       struct chunk_heap *chunk_heap_info;
> +       const __be32 *chunk_order;
> +
> +       phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
> +       phys_addr_t mask = align - 1;
> +
> +       if ((rmem->base & mask) || (rmem->size & mask)) {
> +               pr_err("Incorrect alignment for CMA region\n");
> +               return -EINVAL;

Passing this check can be tough if you're using dynamically assigned
rmem, so it might be helpful for debugging to print the base/size/mask
values?

thanks
-john

  parent reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-21 17:54 [PATCH v4 0/4] Chunk Heap Support on DMA-HEAP Minchan Kim
2021-01-21 17:54 ` [PATCH v4 1/4] mm: cma: introduce gfp flag in cma_alloc instead of no_warn Minchan Kim
2021-01-21 18:46   ` David Hildenbrand
2021-01-21 18:50   ` Minchan Kim
2021-01-25 13:07   ` Michal Hocko
2021-01-25 19:42     ` Minchan Kim
2021-01-26  7:38       ` Michal Hocko
2021-01-26 19:12         ` Minchan Kim
2021-01-27 20:21           ` Minchan Kim
2021-01-21 17:55 ` [PATCH v4 2/4] mm: failfast mode with __GFP_NORETRY in alloc_contig_range Minchan Kim
2021-01-25 13:12   ` Michal Hocko
2021-01-25 13:13     ` Michal Hocko
2021-01-25 19:33     ` Minchan Kim
2021-01-26  7:44       ` Michal Hocko
2021-01-26 19:10         ` Minchan Kim
2021-01-27  8:14           ` Michal Hocko
2021-01-27 20:42         ` Minchan Kim
2021-01-28  7:53           ` Michal Hocko
2021-01-28 16:56             ` Minchan Kim
2021-01-21 17:55 ` [PATCH v4 3/4] dt-bindings: reserved-memory: Make DMA-BUF CMA heap DT-configurable Minchan Kim
2021-01-26  7:07   ` John Stultz
2021-01-27 20:25     ` Hridya Valsaraju
2021-02-05 22:55   ` Rob Herring
2021-01-21 17:55 ` [PATCH v4 4/4] dma-buf: heaps: add chunk heap to dmabuf heaps Minchan Kim
2021-01-26  7:07   ` Christoph Hellwig
2021-01-26 19:27     ` Minchan Kim
2021-01-26  7:32   ` John Stultz [this message]
2021-01-26 19:24     ` Minchan Kim
2021-01-26  7:46   ` Michal Hocko
2021-01-26 19:25     ` Minchan Kim
2021-01-27  8:09       ` Michal Hocko

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