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Date: Wed, 05 Apr 2017 17:20:38 +0200
From: Knut Omang <knut.omang@...cle.com>
To: Doug Ledford <dledford@...hat.com>
Cc: linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
Sean Hefty <sean.hefty@...el.com>,
Hal Rosenstock <hal.rosenstock@...il.com>,
Robin Murphy <robin.murphy@....com>,
Hans-Christian Noren Egtvedt <egtvedt@...fundet.no>,
Vineet Gupta <vgupta@...opsys.com>,
Joerg Roedel <jroedel@...e.de>,
Gerald Schaefer <gerald.schaefer@...ibm.com>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v2 2/8] ib_umem: Add a new, more generic
ib_umem_get_attrs
Dough,
This patch and the next in this set is IMHO together a generic enhancement/cleanup,
is it something you would consider to take just as that?
I am looking at suggesting a simplified, less target specific version of this set
to get it off my chest,
Thanks,
Knut
On Fri, 2016-09-16 at 20:31 +0200, Knut Omang wrote:
> This call allows a full range of DMA attributes and also
> DMA direction to be supplied and is just a refactor of the old ib_umem_get.
> Reimplement ib_umem_get using the new generic call,
> now a trivial implementation.
> ---
> drivers/infiniband/core/umem.c | 23 +++++++++++++++--------
> include/rdma/ib_umem.h | 15 ++++++++++++++-
> 2 files changed, 29 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
> index c68746c..699a0f7 100644
> --- a/drivers/infiniband/core/umem.c
> +++ b/drivers/infiniband/core/umem.c
> @@ -52,7 +52,7 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
> if (umem->nmap > 0)
> ib_dma_unmap_sg(dev, umem->sg_head.sgl,
> umem->nmap,
> - DMA_BIDIRECTIONAL);
> + umem->dir);
>
> for_each_sg(umem->sg_head.sgl, sg, umem->npages, i) {
>
> @@ -82,6 +82,17 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
> struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
> size_t size, int access, int dmasync)
> {
> + unsigned long dma_attrs = 0;
> + if (dmasync)
> + dma_attrs |= DMA_ATTR_WRITE_BARRIER;
> + return ib_umem_get_attrs(context, addr, size, access, DMA_BIDIRECTIONAL, dma_attrs);
> +}
> +EXPORT_SYMBOL(ib_umem_get);
> +
> +struct ib_umem *ib_umem_get_attrs(struct ib_ucontext *context, unsigned long addr,
> + size_t size, int access, enum dma_data_direction dir,
> + unsigned long dma_attrs)
> +{
> struct ib_umem *umem;
> struct page **page_list;
> struct vm_area_struct **vma_list;
> @@ -91,16 +102,11 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
> unsigned long npages;
> int ret;
> int i;
> - unsigned long dma_attrs = 0;
> struct scatterlist *sg, *sg_list_start;
> int need_release = 0;
>
> - if (dmasync)
> - dma_attrs |= DMA_ATTR_WRITE_BARRIER;
> -
> if (!size)
> return ERR_PTR(-EINVAL);
> -
> /*
> * If the combination of the addr and size requested for this memory
> * region causes an integer overflow, return error.
> @@ -121,6 +127,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
> umem->address = addr;
> umem->page_size = PAGE_SIZE;
> umem->pid = get_task_pid(current, PIDTYPE_PID);
> + umem->dir = dir;
> /*
> * We ask for writable memory if any of the following
> * access flags are set. "Local write" and "remote write"
> @@ -213,7 +220,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
> umem->nmap = ib_dma_map_sg_attrs(context->device,
> umem->sg_head.sgl,
> umem->npages,
> - DMA_BIDIRECTIONAL,
> + dir,
> dma_attrs);
>
> if (umem->nmap <= 0) {
> @@ -239,7 +246,7 @@ out:
>
> return ret < 0 ? ERR_PTR(ret) : umem;
> }
> -EXPORT_SYMBOL(ib_umem_get);
> +EXPORT_SYMBOL(ib_umem_get_attrs);
>
> static void ib_umem_account(struct work_struct *work)
> {
> diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
> index 2d83cfd..2876679 100644
> --- a/include/rdma/ib_umem.h
> +++ b/include/rdma/ib_umem.h
> @@ -36,6 +36,7 @@
> #include <linux/list.h>
> #include <linux/scatterlist.h>
> #include <linux/workqueue.h>
> +#include <linux/dma-direction.h>
>
> struct ib_ucontext;
> struct ib_umem_odp;
> @@ -47,6 +48,7 @@ struct ib_umem {
> int page_size;
> int writable;
> int hugetlb;
> + enum dma_data_direction dir;
> struct work_struct work;
> struct pid *pid;
> struct mm_struct *mm;
> @@ -81,9 +83,12 @@ static inline size_t ib_umem_num_pages(struct ib_umem *umem)
> }
>
> #ifdef CONFIG_INFINIBAND_USER_MEM
> -
> struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
> size_t size, int access, int dmasync);
> +struct ib_umem *ib_umem_get_attrs(struct ib_ucontext *context, unsigned long addr,
> + size_t size, int access,
> + enum dma_data_direction dir,
> + unsigned long dma_attrs);
> void ib_umem_release(struct ib_umem *umem);
> int ib_umem_page_count(struct ib_umem *umem);
> int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
> @@ -98,6 +103,14 @@ static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
> int access, int dmasync) {
> return ERR_PTR(-EINVAL);
> }
> +static inline struct ib_umem *ib_umem_get_attrs(struct ib_ucontext *context,
> + unsigned long addr,
> + size_t size, int access,
> + enum dma_data_direction dir,
> + unsigned long dma_attrs)
> +{
> + return ERR_PTR(-EINVAL);
> +}
> static inline void ib_umem_release(struct ib_umem *umem) { }
> static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
> static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
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