linux-next/include/linux/memregion.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _MEMREGION_H_
#define _MEMREGION_H_
#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);
#else
static inline int memregion_alloc(gfp_t gfp)
{
	return -ENOMEM;
}
void memregion_free(int id)
{
}
#endif
#endif /* _MEMREGION_H_ */
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> 2019-11-07 09:43:31 +08:00			`/* SPDX-License-Identifier: GPL-2.0 */`
			`#ifndef _MEMREGION_H_`
			`#define _MEMREGION_H_`
			`#include <linux/types.h>`
			`#include <linux/errno.h>`

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> 2019-11-07 09:43:43 +08:00			`struct memregion_info {`
			`int target_node;`
			`};`

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> 2019-11-07 09:43:31 +08:00			`#ifdef CONFIG_MEMREGION`
			`int memregion_alloc(gfp_t gfp);`
			`void memregion_free(int id);`
			`#else`
			`static inline int memregion_alloc(gfp_t gfp)`
			`{`
			`return -ENOMEM;`
			`}`
			`void memregion_free(int id)`
			`{`
			`}`
			`#endif`
			`#endif /* _MEMREGION_H_ */`