From: Joao Martins <joao.m.martins@oracle.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-nvdimm@lists.01.org,
Vishal Verma <vishal.l.verma@intel.com>,
peterz@infradead.org, dave.hansen@linux.intel.com,
ard.biesheuvel@linaro.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
hch@lst.de
Subject: Re: [PATCH v2 22/22] device-dax: Introduce 'mapping' devices
Date: Thu, 16 Jul 2020 14:18:49 +0100 [thread overview]
Message-ID: <7ecd1b82-06ab-be49-4b92-ac42caab146c@oracle.com> (raw)
In-Reply-To: <159457128462.754248.10443613927921016089.stgit@dwillia2-desk3.amr.corp.intel.com>
On 7/12/20 5:28 PM, Dan Williams wrote:
> In support of interrogating the physical address layout of a device with
> dis-contiguous ranges, introduce a sysfs directory with 'start', 'end',
> and 'page_offset' attributes. The alternative is trying to parse
> /proc/iomem, and that file will not reflect the extent layout until the
> device is enabled.
>
> Cc: Vishal Verma <vishal.l.verma@intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> ---
> drivers/dax/bus.c | 191 +++++++++++++++++++++++++++++++++++++++++++++
> drivers/dax/dax-private.h | 14 +++
> 2 files changed, 203 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
> index f342e36c69a1..8b6c4ddc5f42 100644
> --- a/drivers/dax/bus.c
> +++ b/drivers/dax/bus.c
> @@ -579,6 +579,167 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
> }
> EXPORT_SYMBOL_GPL(alloc_dax_region);
>
> +static void dax_mapping_release(struct device *dev)
> +{
> + struct dax_mapping *mapping = to_dax_mapping(dev);
> + struct dev_dax *dev_dax = to_dev_dax(dev->parent);
> +
> + ida_free(&dev_dax->ida, mapping->id);
> + kfree(mapping);
> +}
> +
> +static void unregister_dax_mapping(void *data)
> +{
> + struct device *dev = data;
> + struct dax_mapping *mapping = to_dax_mapping(dev);
> + struct dev_dax *dev_dax = to_dev_dax(dev->parent);
> + struct dax_region *dax_region = dev_dax->region;
> +
> + dev_dbg(dev, "%s\n", __func__);
> +
> + device_lock_assert(dax_region->dev);
> +
> + dev_dax->ranges[mapping->range_id].mapping = NULL;
> + mapping->range_id = -1;
> +
> + device_del(dev);
> + put_device(dev);
> +}
> +
> +static struct dev_dax_range *get_dax_range(struct device *dev)
> +{
> + struct dax_mapping *mapping = to_dax_mapping(dev);
> + struct dev_dax *dev_dax = to_dev_dax(dev->parent);
> + struct dax_region *dax_region = dev_dax->region;
> +
> + device_lock(dax_region->dev);
> + if (mapping->range_id < 1) {
^^^^^^^^^^^^^^^^^^^^^ it's 'mapping->range_id < 0'
Otherwise 'mapping0' sysfs entries won't work.
Disabled ranges use id -1.
Joao
next prev parent reply other threads:[~2020-07-16 13:19 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-12 16:26 [PATCH v2 00/22] device-dax: Support sub-dividing soft-reserved ranges Dan Williams
2020-07-12 16:26 ` [PATCH v2 01/22] x86/numa: Cleanup configuration dependent command-line options Dan Williams
2020-07-12 16:26 ` [PATCH v2 02/22] x86/numa: Add 'nohmat' option Dan Williams
2020-07-12 16:58 ` Randy Dunlap
2020-07-12 16:26 ` [PATCH v2 03/22] efi/fake_mem: Arrange for a resource entry per efi_fake_mem instance Dan Williams
2020-07-12 16:26 ` [PATCH v2 04/22] ACPI: HMAT: Refactor hmat_register_target_device to hmem_register_device Dan Williams
2020-07-12 16:26 ` [PATCH v2 05/22] resource: Report parent to walk_iomem_res_desc() callback Dan Williams
2020-07-12 16:26 ` [PATCH v2 06/22] x86: Move NUMA_KEEP_MEMINFO and related definition to x86-internals Dan Williams
2020-07-12 16:26 ` [PATCH v2 07/22] numa: Introduce a generic memory_add_physaddr_to_nid() Dan Williams
2020-07-13 6:58 ` Mike Rapoport
2020-07-13 15:42 ` Dan Williams
2020-07-12 16:26 ` [PATCH v2 08/22] memblock: Introduce a generic phys_addr_to_target_node() Dan Williams
2020-07-13 7:03 ` Mike Rapoport
2020-07-13 15:48 ` Dan Williams
2020-07-14 1:36 ` Justin He
2020-07-12 16:26 ` [PATCH v2 09/22] arm64: Convert to generic memblock for numa-info Dan Williams
2020-07-12 16:26 ` [PATCH v2 10/22] ACPI: HMAT: Attach a device for each soft-reserved range Dan Williams
2020-07-12 16:27 ` [PATCH v2 11/22] device-dax: Drop the dax_region.pfn_flags attribute Dan Williams
2020-07-12 16:27 ` [PATCH v2 12/22] device-dax: Move instance creation parameters to 'struct dev_dax_data' Dan Williams
2020-07-12 16:27 ` [PATCH v2 13/22] device-dax: Make pgmap optional for instance creation Dan Williams
2020-07-12 16:27 ` [PATCH v2 14/22] device-dax: Kill dax_kmem_res Dan Williams
2020-07-12 16:27 ` [PATCH v2 15/22] device-dax: Add an allocation interface for device-dax instances Dan Williams
2020-07-12 16:27 ` [PATCH v2 16/22] device-dax: Introduce 'seed' devices Dan Williams
2020-07-12 16:27 ` [PATCH v2 17/22] drivers/base: Make device_find_child_by_name() compatible with sysfs inputs Dan Williams
2020-07-12 17:09 ` Greg Kroah-Hartman
2020-07-13 15:39 ` Dan Williams
2020-07-13 15:52 ` Greg Kroah-Hartman
2020-07-13 16:09 ` Dan Williams
2020-07-13 16:12 ` Greg Kroah-Hartman
2020-07-13 16:36 ` Dan Williams
2020-07-12 16:27 ` [PATCH v2 18/22] device-dax: Add resize support Dan Williams
2020-07-12 16:27 ` [PATCH v2 19/22] mm/memremap_pages: Convert to 'struct range' Dan Williams
2020-07-13 16:36 ` Ralph Campbell
2020-07-13 16:54 ` Dan Williams
2020-07-12 16:27 ` [PATCH v2 20/22] mm/memremap_pages: Support multiple ranges per invocation Dan Williams
2020-07-12 16:27 ` [PATCH v2 21/22] device-dax: Add dis-contiguous resource support Dan Williams
2020-07-12 16:28 ` [PATCH v2 22/22] device-dax: Introduce 'mapping' devices Dan Williams
2020-07-16 13:18 ` Joao Martins [this message]
2020-07-16 16:00 ` Dan Williams
2020-07-16 19:04 ` Joao Martins
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