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authorDan Williams <dan.j.williams@intel.com>2019-11-06 17:43:31 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-11-07 15:44:29 +0100
commit33dd70752cd76f4d883a165a674f13121a4155ed (patch)
treefd7d361649e73adafe59ade9db9429a1be4e0516 /lib
parent199c8471761273b7e287914cee968ddf21dfbfe0 (diff)
downloadlinux-33dd70752cd76f4d883a165a674f13121a4155ed.tar.bz2
lib: Uplevel the pmem "region" ida to a global allocator
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. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig3
-rw-r--r--lib/Makefile1
-rw-r--r--lib/memregion.c18
3 files changed, 22 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 183f92a297ca..0dc043ac271d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -606,6 +606,9 @@ config ARCH_NO_SG_CHAIN
config ARCH_HAS_PMEM_API
bool
+config MEMREGION
+ bool
+
# use memcpy to implement user copies for nommu architectures
config UACCESS_MEMCPY
bool
diff --git a/lib/Makefile b/lib/Makefile
index c5892807e06f..2fb7b47018f1 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -212,6 +212,7 @@ obj-$(CONFIG_GENERIC_NET_UTILS) += net_utils.o
obj-$(CONFIG_SG_SPLIT) += sg_split.o
obj-$(CONFIG_SG_POOL) += sg_pool.o
+obj-$(CONFIG_MEMREGION) += memregion.o
obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
obj-$(CONFIG_IRQ_POLL) += irq_poll.o
diff --git a/lib/memregion.c b/lib/memregion.c
new file mode 100644
index 000000000000..77c85b5251da
--- /dev/null
+++ b/lib/memregion.c
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* identifiers for device / performance-differentiated memory regions */
+#include <linux/idr.h>
+#include <linux/types.h>
+
+static DEFINE_IDA(memregion_ids);
+
+int memregion_alloc(gfp_t gfp)
+{
+ return ida_alloc(&memregion_ids, gfp);
+}
+EXPORT_SYMBOL(memregion_alloc);
+
+void memregion_free(int id)
+{
+ ida_free(&memregion_ids, id);
+}
+EXPORT_SYMBOL(memregion_free);