From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 2453E21290DE3 for ; Fri, 7 Jun 2019 12:42:07 -0700 (PDT) Subject: [PATCH v3 07/10] lib/memregion: Uplevel the pmem "region" ida to a global allocator From: Dan Williams Date: Fri, 07 Jun 2019 12:27:50 -0700 Message-ID: <155993567002.3036719.5748845658364934737.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <155993563277.3036719.17400338098057706494.stgit@dwillia2-desk3.amr.corp.intel.com> References: <155993563277.3036719.17400338098057706494.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: linux-kernel@vger.kernel.org Cc: x86@kernel.org, ard.biesheuvel@linaro.org, peterz@infradead.org, dave.hansen@linux.intel.com, Matthew Wilcox , linux-nvdimm@lists.01.org, linux-efi@vger.kernel.org List-ID: In preparation for handling platform differentiated memory types beyond persistent memory, uplevel the "region" identifier to a global number space. This enables a device-dax instance to be registered to any memory type with guaranteed unique names. Cc: Keith Busch Cc: Matthew Wilcox Signed-off-by: Dan Williams --- drivers/nvdimm/Kconfig | 1 + drivers/nvdimm/core.c | 1 - drivers/nvdimm/nd-core.h | 1 - drivers/nvdimm/region_devs.c | 13 ++++--------- include/linux/memregion.h | 8 ++++++++ lib/Kconfig | 7 +++++++ lib/Makefile | 1 + lib/memregion.c | 15 +++++++++++++++ 8 files changed, 36 insertions(+), 11 deletions(-) create mode 100644 include/linux/memregion.h create mode 100644 lib/memregion.c diff --git a/drivers/nvdimm/Kconfig b/drivers/nvdimm/Kconfig index 54500798f23a..4b3e66fe61c1 100644 --- a/drivers/nvdimm/Kconfig +++ b/drivers/nvdimm/Kconfig @@ -4,6 +4,7 @@ menuconfig LIBNVDIMM depends on PHYS_ADDR_T_64BIT depends on HAS_IOMEM depends on BLK_DEV + select MEMREGION help Generic support for non-volatile memory devices including ACPI-6-NFIT defined resources. On platforms that define an diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c index acce050856a8..75fe651d327d 100644 --- a/drivers/nvdimm/core.c +++ b/drivers/nvdimm/core.c @@ -463,7 +463,6 @@ static __exit void libnvdimm_exit(void) nd_region_exit(); nvdimm_exit(); nvdimm_bus_exit(); - nd_region_devs_exit(); nvdimm_devs_exit(); } diff --git a/drivers/nvdimm/nd-core.h b/drivers/nvdimm/nd-core.h index e5ffd5733540..17561302dfec 100644 --- a/drivers/nvdimm/nd-core.h +++ b/drivers/nvdimm/nd-core.h @@ -133,7 +133,6 @@ struct nvdimm_bus *walk_to_nvdimm_bus(struct device *nd_dev); int __init nvdimm_bus_init(void); void nvdimm_bus_exit(void); void nvdimm_devs_exit(void); -void nd_region_devs_exit(void); void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev); struct nd_region; void nd_region_create_ns_seed(struct nd_region *nd_region); diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index b4ef7d9ff22e..9e070363ff70 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -11,6 +11,7 @@ * General Public License for more details. */ #include +#include #include #include #include @@ -27,7 +28,6 @@ */ #include -static DEFINE_IDA(region_ida); static DEFINE_PER_CPU(int, flush_idx); static int nvdimm_map_flush(struct device *dev, struct nvdimm *nvdimm, int dimm, @@ -141,7 +141,7 @@ static void nd_region_release(struct device *dev) put_device(&nvdimm->dev); } free_percpu(nd_region->lane); - ida_simple_remove(®ion_ida, nd_region->id); + memregion_free(nd_region->id); if (is_nd_blk(dev)) kfree(to_nd_blk_region(dev)); else @@ -1036,7 +1036,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, if (!region_buf) return NULL; - nd_region->id = ida_simple_get(®ion_ida, 0, 0, GFP_KERNEL); + nd_region->id = memregion_alloc(GFP_KERNEL); if (nd_region->id < 0) goto err_id; @@ -1090,7 +1090,7 @@ static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus, return nd_region; err_percpu: - ida_simple_remove(®ion_ida, nd_region->id); + memregion_free(nd_region->id); err_id: kfree(region_buf); return NULL; @@ -1237,8 +1237,3 @@ int nd_region_conflict(struct nd_region *nd_region, resource_size_t start, return device_for_each_child(&nvdimm_bus->dev, &ctx, region_conflict); } - -void __exit nd_region_devs_exit(void) -{ - ida_destroy(®ion_ida); -} diff --git a/include/linux/memregion.h b/include/linux/memregion.h new file mode 100644 index 000000000000..ba03c70f98d2 --- /dev/null +++ b/include/linux/memregion.h @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0 +#ifndef _MEMREGION_H_ +#define _MEMREGION_H_ +#include + +int memregion_alloc(gfp_t gfp); +void memregion_free(int id); +#endif /* _MEMREGION_H_ */ diff --git a/lib/Kconfig b/lib/Kconfig index 90623a0e1942..68621a0505a6 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -335,6 +335,13 @@ config DECOMPRESS_LZ4 config GENERIC_ALLOCATOR bool +# +# Memory Region ID allocation for persistent memory and "specific +# purpose" / performance differentiated memory ranges. +# +config MEMREGION + bool + # # reed solomon support is select'ed if needed # diff --git a/lib/Makefile b/lib/Makefile index fb7697031a79..58cf99f68f36 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -136,6 +136,7 @@ obj-$(CONFIG_LIBCRC32C) += libcrc32c.o obj-$(CONFIG_CRC8) += crc8.o obj-$(CONFIG_XXHASH) += xxhash.o obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o +obj-$(CONFIG_MEMREGION) += memregion.o obj-$(CONFIG_842_COMPRESS) += 842/ obj-$(CONFIG_842_DECOMPRESS) += 842/ diff --git a/lib/memregion.c b/lib/memregion.c new file mode 100644 index 000000000000..f6c6a94c7921 --- /dev/null +++ b/lib/memregion.c @@ -0,0 +1,15 @@ +#include + +static DEFINE_IDA(region_ids); + +int memregion_alloc(gfp_t gfp) +{ + return ida_alloc(®ion_ids, gfp); +} +EXPORT_SYMBOL(memregion_alloc); + +void memregion_free(int id) +{ + ida_free(®ion_ids, id); +} +EXPORT_SYMBOL(memregion_free); _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm