+ dax-hmem-introduce-dax_hmemregion_idle-parameter.patch added to -mm tree

* + dax-hmem-introduce-dax_hmemregion_idle-parameter.patch added to -mm tree
@ 2020-08-21 23:24 akpm
  0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2020-08-21 23:24 UTC (permalink / raw)
  To: airlied, ard.biesheuvel, ardb, benh, bp, Brice.Goglin, bskeggs,
	catalin.marinas, dan.j.williams, daniel, dave.hansen, dave.jiang,
	david, gregkh, hpa, ira.weiny, jgg, jmoyer, joao.m.martins,
	Jonathan.Cameron, justin.he, luto, mingo, mm-commits, mpe,
	pasha.tatashin, paulus, peterz, rafael.j.wysocki, rafael,
	richardw.yang, rjw, rppt, tglx, thomas.lendacky, vishal.l.verma,
	will


The patch titled
     Subject: dax/hmem: introduce dax_hmem.region_idle parameter
has been added to the -mm tree.  Its filename is
     dax-hmem-introduce-dax_hmemregion_idle-parameter.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/dax-hmem-introduce-dax_hmemregion_idle-parameter.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/dax-hmem-introduce-dax_hmemregion_idle-parameter.patch

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------------------------------------------------------
From: Joao Martins <joao.m.martins@oracle.com>
Subject: dax/hmem: introduce dax_hmem.region_idle parameter

Introduce a new module parameter for dax_hmem which initializes all region
devices as free, rather than allocating a pagemap for the region by
default.

All hmem devices created with dax_hmem.region_idle=1 will have full
available size for creating dynamic dax devices.

Link: https://lkml.kernel.org/r/159643106460.4062302.5868522341307530091.stgit@dwillia2-desk3.amr.corp.intel.com
Link: https://lore.kernel.org/r/20200716172913.19658-4-joao.m.martins@oracle.com
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brice Goglin <Brice.Goglin@inria.fr>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: Jason Gunthorpe <jgg@mellanox.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Jia He <justin.he@arm.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Wei Yang <richardw.yang@linux.intel.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/dax/hmem/hmem.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/dax/hmem/hmem.c~dax-hmem-introduce-dax_hmemregion_idle-parameter
+++ a/drivers/dax/hmem/hmem.c
@@ -5,6 +5,9 @@
 #include <linux/pfn_t.h>
 #include "../bus.h"
 
+static bool region_idle;
+module_param_named(region_idle, region_idle, bool, 0644);
+
 static int dax_hmem_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -30,7 +33,7 @@ static int dax_hmem_probe(struct platfor
 	data = (struct dev_dax_data) {
 		.dax_region = dax_region,
 		.id = -1,
-		.size = resource_size(res),
+		.size = region_idle ? 0 : resource_size(res),
 	};
 	dev_dax = devm_create_dev_dax(&data);
 	if (IS_ERR(dev_dax))
_

Patches currently in -mm which might be from joao.m.martins@oracle.com are

device-dax-make-align-a-per-device-property.patch
device-dax-add-an-align-attribute.patch
dax-hmem-introduce-dax_hmemregion_idle-parameter.patch
device-dax-add-a-range-mapping-allocation-attribute.patch


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