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authorDan Williams <dan.j.williams@intel.com>2019-11-07 04:43:43 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-11-07 17:45:00 +0300
commita6c7f4c6aea5f4ca6056b06cec7ebd79f8c23e33 (patch)
treec942e9a1b25e2cf4b47a233ef22e4badebcd86c7 /include/linux/memregion.h
parent460370ab20b6cc174256e46e192adf01e730faf6 (diff)
downloadlinux-a6c7f4c6aea5f4ca6056b06cec7ebd79f8c23e33.tar.xz
device-dax: Add a driver for "hmem" devices
Platform firmware like EFI/ACPI may publish "hmem" platform devices. Such a device is a performance differentiated memory range likely reserved for an application specific use case. The driver gives access to 100% of the capacity via a device-dax mmap instance by default. However, if over-subscription and other kernel memory management is desired the resulting dax device can be assigned to the core-mm via the kmem driver. This consumes "hmem" devices the producer of "hmem" devices is saved for a follow-on patch so that it can reference the new CONFIG_DEV_DAX_HMEM symbol to gate performing the enumeration work. Reported-by: kbuild test robot <lkp@intel.com> Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com> 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 'include/linux/memregion.h')
-rw-r--r--include/linux/memregion.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/memregion.h b/include/linux/memregion.h
index 7de7c0a1444e..e11595256cac 100644
--- a/include/linux/memregion.h
+++ b/include/linux/memregion.h
@@ -4,6 +4,10 @@
#include <linux/types.h>
#include <linux/errno.h>
+struct memregion_info {
+ int target_node;
+};
+
#ifdef CONFIG_MEMREGION
int memregion_alloc(gfp_t gfp);
void memregion_free(int id);