om;
> catalin.mari...@arm.com; iommu@lists.linux-foundation.org; Linuxarm
> ; linux-arm-ker...@lists.infradead.org;
> linux-ker...@vger.kernel.org; Jonathan Cameron
> ; Nicolas Saenz Julienne
> ; Steve Capper ; Andrew
> Morton ; Mike Rapoport ;
> Zengtao (B) ; huangdaode
>
> Su
On Wed, Jul 22, 2020 at 09:41:50PM +, Song Bao Hua (Barry Song) wrote:
> I got a kernel robot warning which said dev should be checked before being
> accessed
> when I did a similar change in v1. Probably it was an invalid warning if dev
> should
> never be null.
That usually shows up if a
On Wed, Jul 22, 2020 at 09:26:03PM +, Song Bao Hua (Barry Song) wrote:
> I understand your concern. Anyway, The primary purpose of this patchset is
> providing
> a general way for users like IOMMU to get local coherent dma buffers to put
> their
> command queue and page tables in. The first
talin.mari...@arm.com; iommu@lists.linux-foundation.org; Linuxarm
> ; linux-arm-ker...@lists.infradead.org;
> linux-ker...@vger.kernel.org; Jonathan Cameron
> ; Nicolas Saenz Julienne
> ; Steve Capper ; Andrew
> Morton ; Mike Rapoport
> Subject: Re: [PATCH v3 1/2] dma-direct: provid
talin.mari...@arm.com; iommu@lists.linux-foundation.org; Linuxarm
> ; linux-arm-ker...@lists.infradead.org;
> linux-ker...@vger.kernel.org; Jonathan Cameron
> ; Nicolas Saenz Julienne
> ; Steve Capper ; Andrew
> Morton ; Mike Rapoport
> Subject: Re: [PATCH v3 1/2] dma-direct: provid
On Sun, Jun 28, 2020 at 11:12:50PM +1200, Barry Song wrote:
> struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp)
> {
> size_t count = size >> PAGE_SHIFT;
> struct page *page = NULL;
> struct cma *cma = NULL;
> + int nid = dev ? dev_to_node(dev) :
On Sun, Jun 28, 2020 at 11:12:50PM +1200, Barry Song wrote:
> This is useful for at least two scenarios:
> 1. ARM64 smmu will get memory from local numa node, it can save its
> command queues and page tables locally. Tests show it can decrease
> dma_unmap latency at lot. For example, without this
