From: Dan Williams <dan.j.williams@intel.com> To: akpm@linux-foundation.org Cc: david@redhat.com, Dave Hansen <dave.hansen@linux.intel.com>, Pavel Tatashin <pasha.tatashin@soleen.com>, Brice Goglin <Brice.Goglin@inria.fr>, Jia He <justin.he@arm.com>, joao.m.martins@oracle.com, Jonathan Cameron <Jonathan.Cameron@huawei.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org Subject: [PATCH v6 02/11] device-dax/kmem: introduce dax_kmem_range() Date: Mon, 05 Oct 2020 23:54:56 -0700 [thread overview] Message-ID: <160196729611.2166475.17062304475053542512.stgit@dwillia2-desk3.amr.corp.intel.com> (raw) In-Reply-To: <160196728453.2166475.12832711415715687418.stgit@dwillia2-desk3.amr.corp.intel.com> Towards removing the mode specific @dax_kmem_res attribute from the generic 'struct dev_dax', and preparing for multi-range support, teach the driver to calculate the hotplug range from the device range. The hotplug range is the trivially calculated memory-block-size aligned version of the device range. Cc: David Hildenbrand <david@redhat.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Brice Goglin <Brice.Goglin@inria.fr> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Jia He <justin.he@arm.com> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/dax/kmem.c | 40 +++++++++++++++++----------------------- 1 file changed, 17 insertions(+), 23 deletions(-) diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c index 5bb133df147d..b0d6a99cf12d 100644 --- a/drivers/dax/kmem.c +++ b/drivers/dax/kmem.c @@ -19,13 +19,20 @@ static const char *kmem_name; /* Set if any memory will remain added when the driver will be unloaded. */ static bool any_hotremove_failed; +static struct range dax_kmem_range(struct dev_dax *dev_dax) +{ + struct range range; + + /* memory-block align the hotplug range */ + range.start = ALIGN(dev_dax->range.start, memory_block_size_bytes()); + range.end = ALIGN_DOWN(dev_dax->range.end + 1, memory_block_size_bytes()) - 1; + return range; +} + int dev_dax_kmem_probe(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); - struct range *range = &dev_dax->range; - resource_size_t kmem_start; - resource_size_t kmem_size; - resource_size_t kmem_end; + struct range range = dax_kmem_range(dev_dax); struct resource *new_res; const char *new_res_name; int numa_node; @@ -44,25 +51,14 @@ int dev_dax_kmem_probe(struct device *dev) return -EINVAL; } - /* Hotplug starting at the beginning of the next block: */ - kmem_start = ALIGN(range->start, memory_block_size_bytes()); - - kmem_size = range_len(range); - /* Adjust the size down to compensate for moving up kmem_start: */ - kmem_size -= kmem_start - range->start; - /* Align the size down to cover only complete blocks: */ - kmem_size &= ~(memory_block_size_bytes() - 1); - kmem_end = kmem_start + kmem_size; - new_res_name = kstrdup(dev_name(dev), GFP_KERNEL); if (!new_res_name) return -ENOMEM; /* Region is permanently reserved if hotremove fails. */ - new_res = request_mem_region(kmem_start, kmem_size, new_res_name); + new_res = request_mem_region(range.start, range_len(&range), new_res_name); if (!new_res) { - dev_warn(dev, "could not reserve region [%pa-%pa]\n", - &kmem_start, &kmem_end); + dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end); kfree(new_res_name); return -EBUSY; } @@ -96,9 +92,8 @@ int dev_dax_kmem_probe(struct device *dev) static int dev_dax_kmem_remove(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); + struct range range = dax_kmem_range(dev_dax); struct resource *res = dev_dax->dax_kmem_res; - resource_size_t kmem_start = res->start; - resource_size_t kmem_size = resource_size(res); const char *res_name = res->name; int rc; @@ -108,12 +103,11 @@ static int dev_dax_kmem_remove(struct device *dev) * there is no way to hotremove this memory until reboot because device * unbind will succeed even if we return failure. */ - rc = remove_memory(dev_dax->target_node, kmem_start, kmem_size); + rc = remove_memory(dev_dax->target_node, range.start, range_len(&range)); if (rc) { any_hotremove_failed = true; - dev_err(dev, - "DAX region %pR cannot be hotremoved until the next reboot\n", - res); + dev_err(dev, "%#llx-%#llx cannot be hotremoved until the next reboot\n", + range.start, range.end); return rc; } _______________________________________________ Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
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From: Dan Williams <dan.j.williams@intel.com> To: akpm@linux-foundation.org Cc: David Hildenbrand <david@redhat.com>, Vishal Verma <vishal.l.verma@intel.com>, Dave Hansen <dave.hansen@linux.intel.com>, Pavel Tatashin <pasha.tatashin@soleen.com>, Brice Goglin <Brice.Goglin@inria.fr>, Dave Jiang <dave.jiang@intel.com>, Ira Weiny <ira.weiny@intel.com>, Jia He <justin.he@arm.com>, Joao Martins <joao.m.martins@oracle.com>, Jonathan Cameron <Jonathan.Cameron@huawei.com>, David Hildenbrand <david@redhat.com>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, david@redhat.com, joao.m.martins@oracle.com Subject: [PATCH v6 02/11] device-dax/kmem: introduce dax_kmem_range() Date: Mon, 05 Oct 2020 23:54:56 -0700 [thread overview] Message-ID: <160196729611.2166475.17062304475053542512.stgit@dwillia2-desk3.amr.corp.intel.com> (raw) In-Reply-To: <160196728453.2166475.12832711415715687418.stgit@dwillia2-desk3.amr.corp.intel.com> Towards removing the mode specific @dax_kmem_res attribute from the generic 'struct dev_dax', and preparing for multi-range support, teach the driver to calculate the hotplug range from the device range. The hotplug range is the trivially calculated memory-block-size aligned version of the device range. Cc: David Hildenbrand <david@redhat.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Pavel Tatashin <pasha.tatashin@soleen.com> Cc: Brice Goglin <Brice.Goglin@inria.fr> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Jia He <justin.he@arm.com> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> --- drivers/dax/kmem.c | 40 +++++++++++++++++----------------------- 1 file changed, 17 insertions(+), 23 deletions(-) diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c index 5bb133df147d..b0d6a99cf12d 100644 --- a/drivers/dax/kmem.c +++ b/drivers/dax/kmem.c @@ -19,13 +19,20 @@ static const char *kmem_name; /* Set if any memory will remain added when the driver will be unloaded. */ static bool any_hotremove_failed; +static struct range dax_kmem_range(struct dev_dax *dev_dax) +{ + struct range range; + + /* memory-block align the hotplug range */ + range.start = ALIGN(dev_dax->range.start, memory_block_size_bytes()); + range.end = ALIGN_DOWN(dev_dax->range.end + 1, memory_block_size_bytes()) - 1; + return range; +} + int dev_dax_kmem_probe(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); - struct range *range = &dev_dax->range; - resource_size_t kmem_start; - resource_size_t kmem_size; - resource_size_t kmem_end; + struct range range = dax_kmem_range(dev_dax); struct resource *new_res; const char *new_res_name; int numa_node; @@ -44,25 +51,14 @@ int dev_dax_kmem_probe(struct device *dev) return -EINVAL; } - /* Hotplug starting at the beginning of the next block: */ - kmem_start = ALIGN(range->start, memory_block_size_bytes()); - - kmem_size = range_len(range); - /* Adjust the size down to compensate for moving up kmem_start: */ - kmem_size -= kmem_start - range->start; - /* Align the size down to cover only complete blocks: */ - kmem_size &= ~(memory_block_size_bytes() - 1); - kmem_end = kmem_start + kmem_size; - new_res_name = kstrdup(dev_name(dev), GFP_KERNEL); if (!new_res_name) return -ENOMEM; /* Region is permanently reserved if hotremove fails. */ - new_res = request_mem_region(kmem_start, kmem_size, new_res_name); + new_res = request_mem_region(range.start, range_len(&range), new_res_name); if (!new_res) { - dev_warn(dev, "could not reserve region [%pa-%pa]\n", - &kmem_start, &kmem_end); + dev_warn(dev, "could not reserve region [%#llx-%#llx]\n", range.start, range.end); kfree(new_res_name); return -EBUSY; } @@ -96,9 +92,8 @@ int dev_dax_kmem_probe(struct device *dev) static int dev_dax_kmem_remove(struct device *dev) { struct dev_dax *dev_dax = to_dev_dax(dev); + struct range range = dax_kmem_range(dev_dax); struct resource *res = dev_dax->dax_kmem_res; - resource_size_t kmem_start = res->start; - resource_size_t kmem_size = resource_size(res); const char *res_name = res->name; int rc; @@ -108,12 +103,11 @@ static int dev_dax_kmem_remove(struct device *dev) * there is no way to hotremove this memory until reboot because device * unbind will succeed even if we return failure. */ - rc = remove_memory(dev_dax->target_node, kmem_start, kmem_size); + rc = remove_memory(dev_dax->target_node, range.start, range_len(&range)); if (rc) { any_hotremove_failed = true; - dev_err(dev, - "DAX region %pR cannot be hotremoved until the next reboot\n", - res); + dev_err(dev, "%#llx-%#llx cannot be hotremoved until the next reboot\n", + range.start, range.end); return rc; }
next prev parent reply other threads:[~2020-10-06 7:13 UTC|newest] Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-06 6:54 [PATCH v6 00/11] device-dax: support sub-dividing soft-reserved ranges Dan Williams 2020-10-06 6:54 ` Dan Williams 2020-10-06 6:54 ` [PATCH v6 01/11] device-dax: make pgmap optional for instance creation Dan Williams 2020-10-06 6:54 ` Dan Williams 2020-10-06 6:54 ` Dan Williams [this message] 2020-10-06 6:54 ` [PATCH v6 02/11] device-dax/kmem: introduce dax_kmem_range() Dan Williams 2020-10-06 6:55 ` [PATCH v6 03/11] device-dax/kmem: move resource tracking to drvdata Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 8:14 ` David Hildenbrand 2020-10-06 8:14 ` David Hildenbrand 2020-10-06 6:55 ` [PATCH v6 04/11] device-dax: add an allocation interface for device-dax instances Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 6:55 ` [PATCH v6 05/11] device-dax: introduce 'struct dev_dax' typed-driver operations Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 6:55 ` [PATCH v6 06/11] device-dax: introduce 'seed' devices Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 6:55 ` [PATCH v6 07/11] drivers/base: make device_find_child_by_name() compatible with sysfs inputs Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 6:55 ` [PATCH v6 08/11] device-dax: add resize support Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 6:55 ` [PATCH v6 09/11] mm/memremap_pages: convert to 'struct range' Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-08 19:52 ` boris.ostrovsky 2020-10-08 19:52 ` boris.ostrovsky 2020-10-06 6:55 ` [PATCH v6 10/11] mm/memremap_pages: support multiple ranges per invocation Dan Williams 2020-10-06 6:55 ` Dan Williams 2020-10-06 6:55 ` [PATCH v6 11/11] device-dax: add dis-contiguous resource support Dan Williams 2020-10-06 6:55 ` Dan Williams
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