diff options
author | Dan Williams <dan.j.williams@intel.com> | 2018-12-28 00:35:07 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-28 12:11:47 -0800 |
commit | 58ef15b765af0d2cbe6799ec564f1dc485010ab8 (patch) | |
tree | 392b19ef2cad7086d1b8205aa69306e311c65073 /mm | |
parent | 69324b8f48339de2f90fdf2f774687fc6c47629a (diff) | |
download | linux-58ef15b765af0d2cbe6799ec564f1dc485010ab8.tar.gz linux-58ef15b765af0d2cbe6799ec564f1dc485010ab8.tar.bz2 linux-58ef15b765af0d2cbe6799ec564f1dc485010ab8.zip |
mm, hmm: use devm semantics for hmm_devmem_{add, remove}
devm semantics arrange for resources to be torn down when
device-driver-probe fails or when device-driver-release completes.
Similar to devm_memremap_pages() there is no need to support an explicit
remove operation when the users properly adhere to devm semantics.
Note that devm_kzalloc() automatically handles allocating node-local
memory.
Link: http://lkml.kernel.org/r/154275559545.76910.9186690723515469051.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/hmm.c | 127 |
1 files changed, 24 insertions, 103 deletions
@@ -987,7 +987,6 @@ static void hmm_devmem_ref_exit(void *data) devmem = container_of(ref, struct hmm_devmem, ref); percpu_ref_exit(ref); - devm_remove_action(devmem->device, &hmm_devmem_ref_exit, data); } static void hmm_devmem_ref_kill(void *data) @@ -998,7 +997,6 @@ static void hmm_devmem_ref_kill(void *data) devmem = container_of(ref, struct hmm_devmem, ref); percpu_ref_kill(ref); wait_for_completion(&devmem->completion); - devm_remove_action(devmem->device, &hmm_devmem_ref_kill, data); } static int hmm_devmem_fault(struct vm_area_struct *vma, @@ -1036,7 +1034,7 @@ static void hmm_devmem_radix_release(struct resource *resource) mutex_unlock(&hmm_devmem_lock); } -static void hmm_devmem_release(struct device *dev, void *data) +static void hmm_devmem_release(void *data) { struct hmm_devmem *devmem = data; struct resource *resource = devmem->resource; @@ -1044,11 +1042,6 @@ static void hmm_devmem_release(struct device *dev, void *data) struct zone *zone; struct page *page; - if (percpu_ref_tryget_live(&devmem->ref)) { - dev_WARN(dev, "%s: page mapping is still live!\n", __func__); - percpu_ref_put(&devmem->ref); - } - /* pages are dead and unused, undo the arch mapping */ start_pfn = (resource->start & ~(PA_SECTION_SIZE - 1)) >> PAGE_SHIFT; npages = ALIGN(resource_size(resource), PA_SECTION_SIZE) >> PAGE_SHIFT; @@ -1174,19 +1167,6 @@ error: return ret; } -static int hmm_devmem_match(struct device *dev, void *data, void *match_data) -{ - struct hmm_devmem *devmem = data; - - return devmem->resource == match_data; -} - -static void hmm_devmem_pages_remove(struct hmm_devmem *devmem) -{ - devres_release(devmem->device, &hmm_devmem_release, - &hmm_devmem_match, devmem->resource); -} - /* * hmm_devmem_add() - hotplug ZONE_DEVICE memory for device memory * @@ -1214,8 +1194,7 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, dev_pagemap_get_ops(); - devmem = devres_alloc_node(&hmm_devmem_release, sizeof(*devmem), - GFP_KERNEL, dev_to_node(device)); + devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL); if (!devmem) return ERR_PTR(-ENOMEM); @@ -1229,11 +1208,11 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release, 0, GFP_KERNEL); if (ret) - goto error_percpu_ref; + return ERR_PTR(ret); - ret = devm_add_action(device, hmm_devmem_ref_exit, &devmem->ref); + ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit, &devmem->ref); if (ret) - goto error_devm_add_action; + return ERR_PTR(ret); size = ALIGN(size, PA_SECTION_SIZE); addr = min((unsigned long)iomem_resource.end, @@ -1253,16 +1232,12 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, devmem->resource = devm_request_mem_region(device, addr, size, dev_name(device)); - if (!devmem->resource) { - ret = -ENOMEM; - goto error_no_resource; - } + if (!devmem->resource) + return ERR_PTR(-ENOMEM); break; } - if (!devmem->resource) { - ret = -ERANGE; - goto error_no_resource; - } + if (!devmem->resource) + return ERR_PTR(-ERANGE); devmem->resource->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY; devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT; @@ -1271,28 +1246,13 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, ret = hmm_devmem_pages_create(devmem); if (ret) - goto error_pages; - - devres_add(device, devmem); + return ERR_PTR(ret); - ret = devm_add_action(device, hmm_devmem_ref_kill, &devmem->ref); - if (ret) { - hmm_devmem_remove(devmem); + ret = devm_add_action_or_reset(device, hmm_devmem_release, devmem); + if (ret) return ERR_PTR(ret); - } return devmem; - -error_pages: - devm_release_mem_region(device, devmem->resource->start, - resource_size(devmem->resource)); -error_no_resource: -error_devm_add_action: - hmm_devmem_ref_kill(&devmem->ref); - hmm_devmem_ref_exit(&devmem->ref); -error_percpu_ref: - devres_free(devmem); - return ERR_PTR(ret); } EXPORT_SYMBOL(hmm_devmem_add); @@ -1308,8 +1268,7 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops, dev_pagemap_get_ops(); - devmem = devres_alloc_node(&hmm_devmem_release, sizeof(*devmem), - GFP_KERNEL, dev_to_node(device)); + devmem = devm_kzalloc(device, sizeof(*devmem), GFP_KERNEL); if (!devmem) return ERR_PTR(-ENOMEM); @@ -1323,12 +1282,12 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops, ret = percpu_ref_init(&devmem->ref, &hmm_devmem_ref_release, 0, GFP_KERNEL); if (ret) - goto error_percpu_ref; + return ERR_PTR(ret); - ret = devm_add_action(device, hmm_devmem_ref_exit, &devmem->ref); + ret = devm_add_action_or_reset(device, hmm_devmem_ref_exit, + &devmem->ref); if (ret) - goto error_devm_add_action; - + return ERR_PTR(ret); devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT; devmem->pfn_last = devmem->pfn_first + @@ -1336,60 +1295,22 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops, ret = hmm_devmem_pages_create(devmem); if (ret) - goto error_devm_add_action; + return ERR_PTR(ret); - devres_add(device, devmem); + ret = devm_add_action_or_reset(device, hmm_devmem_release, devmem); + if (ret) + return ERR_PTR(ret); - ret = devm_add_action(device, hmm_devmem_ref_kill, &devmem->ref); - if (ret) { - hmm_devmem_remove(devmem); + ret = devm_add_action_or_reset(device, hmm_devmem_ref_kill, + &devmem->ref); + if (ret) return ERR_PTR(ret); - } return devmem; - -error_devm_add_action: - hmm_devmem_ref_kill(&devmem->ref); - hmm_devmem_ref_exit(&devmem->ref); -error_percpu_ref: - devres_free(devmem); - return ERR_PTR(ret); } EXPORT_SYMBOL(hmm_devmem_add_resource); /* - * hmm_devmem_remove() - remove device memory (kill and free ZONE_DEVICE) - * - * @devmem: hmm_devmem struct use to track and manage the ZONE_DEVICE memory - * - * This will hot-unplug memory that was hotplugged by hmm_devmem_add on behalf - * of the device driver. It will free struct page and remove the resource that - * reserved the physical address range for this device memory. - */ -void hmm_devmem_remove(struct hmm_devmem *devmem) -{ - resource_size_t start, size; - struct device *device; - bool cdm = false; - - if (!devmem) - return; - - device = devmem->device; - start = devmem->resource->start; - size = resource_size(devmem->resource); - - cdm = devmem->resource->desc == IORES_DESC_DEVICE_PUBLIC_MEMORY; - hmm_devmem_ref_kill(&devmem->ref); - hmm_devmem_ref_exit(&devmem->ref); - hmm_devmem_pages_remove(devmem); - - if (!cdm) - devm_release_mem_region(device, start, size); -} -EXPORT_SYMBOL(hmm_devmem_remove); - -/* * A device driver that wants to handle multiple devices memory through a * single fake device can use hmm_device to do so. This is purely a helper * and it is not needed to make use of any HMM functionality. |