linux-kernel - [HMM-CDM 5/5] mm/hmm: simplify kconfig and enable HMM and DEVICE

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Date:   Wed, 14 Jun 2017 16:11:44 -0400
From:   Jérôme Glisse <jglisse@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Balbir Singh <balbirs@....ibm.com>,
        Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: [HMM-CDM 5/5] mm/hmm: simplify kconfig and enable HMM and DEVICE_PUBLIC for ppc64

This just simplify kconfig and allow HMM and DEVICE_PUBLIC to be
selected for ppc64 once ZONE_DEVICE is allowed on ppc64 (different
patchset).

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Signed-off-by: John Hubbard <jhubbard@...dia.com>
Cc: Balbir Singh <balbirs@....ibm.com>
Cc: Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---
 include/linux/hmm.h |  4 ++--
 mm/Kconfig          | 27 ++++++---------------------
 mm/hmm.c            |  4 ++--
 3 files changed, 10 insertions(+), 25 deletions(-)

diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index f6713b2..720d18c 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -327,7 +327,7 @@ int hmm_vma_fault(struct vm_area_struct *vma,
 #endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
 
 
-#if IS_ENABLED(CONFIG_HMM_DEVMEM)
+#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
 struct hmm_devmem;
 
 struct page *hmm_vma_alloc_locked_page(struct vm_area_struct *vma,
@@ -456,7 +456,7 @@ struct hmm_device {
  */
 struct hmm_device *hmm_device_new(void *drvdata);
 void hmm_device_put(struct hmm_device *hmm_device);
-#endif /* IS_ENABLED(CONFIG_HMM_DEVMEM) */
+#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
 
 
 /* Below are for HMM internal use only! Not to be used by device driver! */
diff --git a/mm/Kconfig b/mm/Kconfig
index ad082b9..7de939a 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -265,7 +265,7 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION
 config ARCH_HAS_HMM
 	bool
 	default y
-	depends on X86_64
+	depends on X86_64 || PPC64
 	depends on ZONE_DEVICE
 	depends on MMU && 64BIT
 	depends on MEMORY_HOTPLUG
@@ -277,7 +277,7 @@ config HMM
 
 config HMM_MIRROR
 	bool "HMM mirror CPU page table into a device page table"
-	depends on ARCH_HAS_HMM
+	depends on ARCH_HAS_HMM && X86_64
 	select MMU_NOTIFIER
 	select HMM
 	help
@@ -287,15 +287,6 @@ config HMM_MIRROR
 	  page tables (at PAGE_SIZE granularity), and must be able to recover from
 	  the resulting potential page faults.
 
-config HMM_DEVMEM
-	bool "HMM device memory helpers (to leverage ZONE_DEVICE)"
-	depends on ARCH_HAS_HMM
-	select HMM
-	help
-	  HMM devmem is a set of helper routines to leverage the ZONE_DEVICE
-	  feature. This is just to avoid having device drivers to replicating a lot
-	  of boiler plate code.  See Documentation/vm/hmm.txt.
-
 config PHYS_ADDR_T_64BIT
 	def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT
 
@@ -720,11 +711,8 @@ config ZONE_DEVICE
 
 config DEVICE_PRIVATE
 	bool "Unaddressable device memory (GPU memory, ...)"
-	depends on X86_64
-	depends on ZONE_DEVICE
-	depends on MEMORY_HOTPLUG
-	depends on MEMORY_HOTREMOVE
-	depends on SPARSEMEM_VMEMMAP
+	depends on ARCH_HAS_HMM && X86_64
+	select HMM
 
 	help
 	  Allows creation of struct pages to represent unaddressable device
@@ -733,11 +721,8 @@ config DEVICE_PRIVATE
 
 config DEVICE_PUBLIC
 	bool "Unaddressable device memory (GPU memory, ...)"
-	depends on X86_64
-	depends on ZONE_DEVICE
-	depends on MEMORY_HOTPLUG
-	depends on MEMORY_HOTREMOVE
-	depends on SPARSEMEM_VMEMMAP
+	depends on ARCH_HAS_HMM
+	select HMM
 
 	help
 	  Allows creation of struct pages to represent addressable device
diff --git a/mm/hmm.c b/mm/hmm.c
index aed110e..085cc06 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -747,7 +747,7 @@ EXPORT_SYMBOL(hmm_vma_fault);
 #endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
 
 
-#if IS_ENABLED(CONFIG_HMM_DEVMEM)
+#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC)
 struct page *hmm_vma_alloc_locked_page(struct vm_area_struct *vma,
 				       unsigned long addr)
 {
@@ -1306,4 +1306,4 @@ static int __init hmm_init(void)
 }
 
 device_initcall(hmm_init);
-#endif /* IS_ENABLED(CONFIG_HMM_DEVMEM) */
+#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
-- 
2.9.3