Re: [Nouveau] [PATCH 03/22] mm: remove hmm_devmem_add_resource
On Thu, Jun 13, 2019 at 06:52:44PM +, Jason Gunthorpe wrote: > On Thu, Jun 13, 2019 at 11:43:06AM +0200, Christoph Hellwig wrote: > > This function has never been used since it was first added to the kernel > > more than a year and a half ago, and if we ever grow a consumer of the > > MEMORY_DEVICE_PUBLIC infrastructure it can easily use devm_memremap_pages > > directly now that we've simplified the API for it. > > nit: Have we simplified the interface for devm_memremap_pages() at > this point, or are you talking about later patches in this series. After this series. I've just droped that part of the sentence to avoid confusion. > I checked this and all the called functions are exported symbols, so > there is no blocker for a future driver to call devm_memremap_pages(), > maybe even with all this boiler plate, in future. > > If we eventually get many users that need some simplified registration > then we should add a devm_memremap_pages_simplified() interface and > factor out that code when we can see the pattern. After this series devm_memremap_pages already is simpler to use than hmm_device_add_resource was before, so I'm not worried at all. The series actually net removes lines from noveau (if only a few). ___ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau
Re: [Nouveau] [PATCH 03/22] mm: remove hmm_devmem_add_resource
On 6/13/19 2:43 AM, Christoph Hellwig wrote:
> This function has never been used since it was first added to the kernel
> more than a year and a half ago, and if we ever grow a consumer of the
> MEMORY_DEVICE_PUBLIC infrastructure it can easily use devm_memremap_pages
> directly now that we've simplified the API for it.
>
> Signed-off-by: Christoph Hellwig
> ---
> include/linux/hmm.h | 3 ---
> mm/hmm.c| 54 -
> 2 files changed, 57 deletions(-)
>
No objections here, good cleanup.
Reviewed-by: John Hubbard
thanks,
--
John Hubbard
NVIDIA
> diff --git a/include/linux/hmm.h b/include/linux/hmm.h
> index 4867b9da1b6c..5761a39221a6 100644
> --- a/include/linux/hmm.h
> +++ b/include/linux/hmm.h
> @@ -688,9 +688,6 @@ struct hmm_devmem {
> struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
> struct device *device,
> unsigned long size);
> -struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
> -struct device *device,
> -struct resource *res);
>
> /*
> * hmm_devmem_page_set_drvdata - set per-page driver data field
> diff --git a/mm/hmm.c b/mm/hmm.c
> index ff2598eb7377..0c62426d1257 100644
> --- a/mm/hmm.c
> +++ b/mm/hmm.c
> @@ -1445,58 +1445,4 @@ struct hmm_devmem *hmm_devmem_add(const struct
> hmm_devmem_ops *ops,
> return devmem;
> }
> EXPORT_SYMBOL_GPL(hmm_devmem_add);
> -
> -struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
> -struct device *device,
> -struct resource *res)
> -{
> - struct hmm_devmem *devmem;
> - void *result;
> - int ret;
> -
> - if (res->desc != IORES_DESC_DEVICE_PUBLIC_MEMORY)
> - return ERR_PTR(-EINVAL);
> -
> - dev_pagemap_get_ops();
> -
> - devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
> - if (!devmem)
> - return ERR_PTR(-ENOMEM);
> -
> - init_completion(>completion);
> - devmem->pfn_first = -1UL;
> - devmem->pfn_last = -1UL;
> - devmem->resource = res;
> - devmem->device = device;
> - devmem->ops = ops;
> -
> - ret = percpu_ref_init(>ref, _devmem_ref_release,
> - 0, GFP_KERNEL);
> - if (ret)
> - return ERR_PTR(ret);
> -
> - ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit,
> - >ref);
> - if (ret)
> - return ERR_PTR(ret);
> -
> - devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
> - devmem->pfn_last = devmem->pfn_first +
> -(resource_size(devmem->resource) >> PAGE_SHIFT);
> - devmem->page_fault = hmm_devmem_fault;
> -
> - devmem->pagemap.type = MEMORY_DEVICE_PUBLIC;
> - devmem->pagemap.res = *devmem->resource;
> - devmem->pagemap.page_free = hmm_devmem_free;
> - devmem->pagemap.altmap_valid = false;
> - devmem->pagemap.ref = >ref;
> - devmem->pagemap.data = devmem;
> - devmem->pagemap.kill = hmm_devmem_ref_kill;
> -
> - result = devm_memremap_pages(devmem->device, >pagemap);
> - if (IS_ERR(result))
> - return result;
> - return devmem;
> -}
> -EXPORT_SYMBOL_GPL(hmm_devmem_add_resource);
> #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
>
Re: [Nouveau] [PATCH 03/22] mm: remove hmm_devmem_add_resource
On Thu, Jun 13, 2019 at 11:43:06AM +0200, Christoph Hellwig wrote: > This function has never been used since it was first added to the kernel > more than a year and a half ago, and if we ever grow a consumer of the > MEMORY_DEVICE_PUBLIC infrastructure it can easily use devm_memremap_pages > directly now that we've simplified the API for it. nit: Have we simplified the interface for devm_memremap_pages() at this point, or are you talking about later patches in this series. I checked this and all the called functions are exported symbols, so there is no blocker for a future driver to call devm_memremap_pages(), maybe even with all this boiler plate, in future. If we eventually get many users that need some simplified registration then we should add a devm_memremap_pages_simplified() interface and factor out that code when we can see the pattern. Reviewed-by: Jason Gunthorpe Jason ___ Nouveau mailing list Nouveau@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/nouveau
[Nouveau] [PATCH 03/22] mm: remove hmm_devmem_add_resource
This function has never been used since it was first added to the kernel
more than a year and a half ago, and if we ever grow a consumer of the
MEMORY_DEVICE_PUBLIC infrastructure it can easily use devm_memremap_pages
directly now that we've simplified the API for it.
Signed-off-by: Christoph Hellwig
---
include/linux/hmm.h | 3 ---
mm/hmm.c| 54 -
2 files changed, 57 deletions(-)
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 4867b9da1b6c..5761a39221a6 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -688,9 +688,6 @@ struct hmm_devmem {
struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops,
struct device *device,
unsigned long size);
-struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
- struct device *device,
- struct resource *res);
/*
* hmm_devmem_page_set_drvdata - set per-page driver data field
diff --git a/mm/hmm.c b/mm/hmm.c
index ff2598eb7377..0c62426d1257 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -1445,58 +1445,4 @@ struct hmm_devmem *hmm_devmem_add(const struct
hmm_devmem_ops *ops,
return devmem;
}
EXPORT_SYMBOL_GPL(hmm_devmem_add);
-
-struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops,
- struct device *device,
- struct resource *res)
-{
- struct hmm_devmem *devmem;
- void *result;
- int ret;
-
- if (res->desc != IORES_DESC_DEVICE_PUBLIC_MEMORY)
- return ERR_PTR(-EINVAL);
-
- dev_pagemap_get_ops();
-
- devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL);
- if (!devmem)
- return ERR_PTR(-ENOMEM);
-
- init_completion(>completion);
- devmem->pfn_first = -1UL;
- devmem->pfn_last = -1UL;
- devmem->resource = res;
- devmem->device = device;
- devmem->ops = ops;
-
- ret = percpu_ref_init(>ref, _devmem_ref_release,
- 0, GFP_KERNEL);
- if (ret)
- return ERR_PTR(ret);
-
- ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit,
- >ref);
- if (ret)
- return ERR_PTR(ret);
-
- devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT;
- devmem->pfn_last = devmem->pfn_first +
- (resource_size(devmem->resource) >> PAGE_SHIFT);
- devmem->page_fault = hmm_devmem_fault;
-
- devmem->pagemap.type = MEMORY_DEVICE_PUBLIC;
- devmem->pagemap.res = *devmem->resource;
- devmem->pagemap.page_free = hmm_devmem_free;
- devmem->pagemap.altmap_valid = false;
- devmem->pagemap.ref = >ref;
- devmem->pagemap.data = devmem;
- devmem->pagemap.kill = hmm_devmem_ref_kill;
-
- result = devm_memremap_pages(devmem->device, >pagemap);
- if (IS_ERR(result))
- return result;
- return devmem;
-}
-EXPORT_SYMBOL_GPL(hmm_devmem_add_resource);
#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
--
2.20.1
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