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Date: Thu, 1 Oct 2020 10:41:11 +0200
From: David Hildenbrand <david@...hat.com>
To: Dan Williams <dan.j.williams@...el.com>, akpm@...ux-foundation.org
Cc: Vishal Verma <vishal.l.verma@...el.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Brice Goglin <Brice.Goglin@...ia.fr>,
Dave Jiang <dave.jiang@...el.com>,
Ira Weiny <ira.weiny@...el.com>, Jia He <justin.he@....com>,
Joao Martins <joao.m.martins@...cle.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
linux-mm@...ck.org, linux-nvdimm@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/17] device-dax: make pgmap optional for instance
creation
On 25.09.20 21:11, Dan Williams wrote:
> The passed in dev_pagemap is only required in the pmem case as the
> libnvdimm core may have reserved a vmem_altmap for dev_memremap_pages() to
> place the memmap in pmem directly. In the hmem case there is no agent
> reserving an altmap so it can all be handled by a core internal default.
>
> Pass the resource range via a new @range property of 'struct
> dev_dax_data'.
>
> Link: https://lkml.kernel.org/r/159643099958.4062302.10379230791041872886.stgit@dwillia2-desk3.amr.corp.intel.com
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Vishal Verma <vishal.l.verma@...el.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Pavel Tatashin <pasha.tatashin@...een.com>
> Cc: Brice Goglin <Brice.Goglin@...ia.fr>
> Cc: Dave Jiang <dave.jiang@...el.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Jia He <justin.he@....com>
> Cc: Joao Martins <joao.m.martins@...cle.com>
> Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> ---
> drivers/dax/bus.c | 29 +++++++++++++++--------------
> drivers/dax/bus.h | 2 ++
> drivers/dax/dax-private.h | 9 ++++++++-
> drivers/dax/device.c | 28 +++++++++++++++++++---------
> drivers/dax/hmem/hmem.c | 8 ++++----
> drivers/dax/kmem.c | 12 ++++++------
> drivers/dax/pmem/core.c | 4 ++++
> tools/testing/nvdimm/dax-dev.c | 8 ++++----
> 8 files changed, 62 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
> index dffa4655e128..96bd64ba95a5 100644
> --- a/drivers/dax/bus.c
> +++ b/drivers/dax/bus.c
> @@ -271,7 +271,7 @@ static ssize_t size_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct dev_dax *dev_dax = to_dev_dax(dev);
> - unsigned long long size = resource_size(&dev_dax->region->res);
> + unsigned long long size = range_len(&dev_dax->range);
>
> return sprintf(buf, "%llu\n", size);
> }
> @@ -293,19 +293,12 @@ static ssize_t target_node_show(struct device *dev,
> }
> static DEVICE_ATTR_RO(target_node);
>
> -static unsigned long long dev_dax_resource(struct dev_dax *dev_dax)
> -{
> - struct dax_region *dax_region = dev_dax->region;
> -
> - return dax_region->res.start;
> -}
> -
> static ssize_t resource_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct dev_dax *dev_dax = to_dev_dax(dev);
>
> - return sprintf(buf, "%#llx\n", dev_dax_resource(dev_dax));
> + return sprintf(buf, "%#llx\n", dev_dax->range.start);
> }
> static DEVICE_ATTR(resource, 0400, resource_show, NULL);
>
> @@ -376,6 +369,7 @@ static void dev_dax_release(struct device *dev)
>
> dax_region_put(dax_region);
> put_dax(dax_dev);
> + kfree(dev_dax->pgmap);
> kfree(dev_dax);
> }
>
> @@ -412,7 +406,12 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
> if (!dev_dax)
> return ERR_PTR(-ENOMEM);
>
> - memcpy(&dev_dax->pgmap, data->pgmap, sizeof(struct dev_pagemap));
> + if (data->pgmap) {
> + dev_dax->pgmap = kmemdup(data->pgmap,
> + sizeof(struct dev_pagemap), GFP_KERNEL);
> + if (!dev_dax->pgmap)
> + goto err_pgmap;
> + }
>
> /*
> * No 'host' or dax_operations since there is no access to this
> @@ -421,18 +420,19 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
> dax_dev = alloc_dax(dev_dax, NULL, NULL, DAXDEV_F_SYNC);
> if (IS_ERR(dax_dev)) {
> rc = PTR_ERR(dax_dev);
> - goto err;
> + goto err_alloc_dax;
> }
>
> /* a device_dax instance is dead while the driver is not attached */
> kill_dax(dax_dev);
>
> - /* from here on we're committed to teardown via dax_dev_release() */
> + /* from here on we're committed to teardown via dev_dax_release() */
> dev = &dev_dax->dev;
> device_initialize(dev);
>
> dev_dax->dax_dev = dax_dev;
> dev_dax->region = dax_region;
> + dev_dax->range = data->range;
> dev_dax->target_node = dax_region->target_node;
> kref_get(&dax_region->kref);
>
> @@ -458,8 +458,9 @@ struct dev_dax *devm_create_dev_dax(struct dev_dax_data *data)
> return ERR_PTR(rc);
>
> return dev_dax;
> -
> - err:
> +err_alloc_dax:
> + kfree(dev_dax->pgmap);
> +err_pgmap:
> kfree(dev_dax);
>
> return ERR_PTR(rc);
> diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h
> index 299c2e7fac09..4aeb36da83a4 100644
> --- a/drivers/dax/bus.h
> +++ b/drivers/dax/bus.h
> @@ -3,6 +3,7 @@
> #ifndef __DAX_BUS_H__
> #define __DAX_BUS_H__
> #include <linux/device.h>
> +#include <linux/range.h>
>
> struct dev_dax;
> struct resource;
> @@ -21,6 +22,7 @@ struct dev_dax_data {
> struct dax_region *dax_region;
> struct dev_pagemap *pgmap;
> enum dev_dax_subsys subsys;
> + struct range range;
> int id;
> };
>
> diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
> index 8a4c40ccd2ef..6779f683671d 100644
> --- a/drivers/dax/dax-private.h
> +++ b/drivers/dax/dax-private.h
> @@ -41,6 +41,7 @@ struct dax_region {
> * @target_node: effective numa node if dev_dax memory range is onlined
> * @dev - device core
> * @pgmap - pgmap for memmap setup / lifetime (driver owned)
> + * @range: resource range for the instance
> * @dax_mem_res: physical address range of hotadded DAX memory
> * @dax_mem_name: name for hotadded DAX memory via add_memory_driver_managed()
> */
> @@ -49,10 +50,16 @@ struct dev_dax {
> struct dax_device *dax_dev;
> int target_node;
> struct device dev;
> - struct dev_pagemap pgmap;
> + struct dev_pagemap *pgmap;
> + struct range range;
> struct resource *dax_kmem_res;
> };
>
> +static inline u64 range_len(struct range *range)
> +{
> + return range->end - range->start + 1;
> +}
include/linux/range.h seems to have this function - why is this here needed?
--
Thanks,
David / dhildenb
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