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Date: Thu, 13 Jun 2019 11:43:24 +0200
From: Christoph Hellwig <hch@....de>
To: Dan Williams <dan.j.williams@...el.com>,
Jérôme Glisse <jglisse@...hat.com>,
Jason Gunthorpe <jgg@...lanox.com>,
Ben Skeggs <bskeggs@...hat.com>
Cc: linux-mm@...ck.org, nouveau@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-nvdimm@...ts.01.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 21/22] mm: remove the HMM config option
All the mm/hmm.c code is better keyed off HMM_MIRROR. Also let nouveau
depend on it instead of the mix of a dummy dependency symbol plus the
actually selected one. Drop various odd dependencies, as the code is
pretty portable.
Signed-off-by: Christoph Hellwig <hch@....de>
---
drivers/gpu/drm/nouveau/Kconfig | 3 +--
include/linux/hmm.h | 14 +++-----------
include/linux/mm_types.h | 2 +-
mm/Kconfig | 27 +++------------------------
mm/Makefile | 2 +-
mm/hmm.c | 2 --
6 files changed, 9 insertions(+), 41 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig
index 6303d203ab1d..66c839d8e9d1 100644
--- a/drivers/gpu/drm/nouveau/Kconfig
+++ b/drivers/gpu/drm/nouveau/Kconfig
@@ -84,11 +84,10 @@ config DRM_NOUVEAU_BACKLIGHT
config DRM_NOUVEAU_SVM
bool "(EXPERIMENTAL) Enable SVM (Shared Virtual Memory) support"
- depends on ARCH_HAS_HMM
depends on DEVICE_PRIVATE
depends on DRM_NOUVEAU
+ depends on HMM_MIRROR
depends on STAGING
- select HMM_MIRROR
default n
help
Say Y here if you want to enable experimental support for
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index e095a8b55dfa..64ea2fa00872 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -62,7 +62,7 @@
#include <linux/kconfig.h>
#include <asm/pgtable.h>
-#if IS_ENABLED(CONFIG_HMM)
+#ifdef CONFIG_HMM_MIRROR
#include <linux/device.h>
#include <linux/migrate.h>
@@ -324,9 +324,6 @@ static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
return hmm_device_entry_from_pfn(range, pfn);
}
-
-
-#if IS_ENABLED(CONFIG_HMM_MIRROR)
/*
* Mirroring: how to synchronize device page table with CPU page table.
*
@@ -546,13 +543,8 @@ static inline void hmm_mm_init(struct mm_struct *mm)
{
mm->hmm = NULL;
}
-#else /* IS_ENABLED(CONFIG_HMM_MIRROR) */
-static inline void hmm_mm_init(struct mm_struct *mm) {}
-#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
-
-#else /* IS_ENABLED(CONFIG_HMM) */
-static inline void hmm_mm_destroy(struct mm_struct *mm) {}
+#else /* CONFIG_HMM_MIRROR */
static inline void hmm_mm_init(struct mm_struct *mm) {}
-#endif /* IS_ENABLED(CONFIG_HMM) */
+#endif /* CONFIG_HMM_MIRROR */
#endif /* LINUX_HMM_H */
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index f33a1289c101..8d37182f8dbe 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -501,7 +501,7 @@ struct mm_struct {
#endif
struct work_struct async_put_work;
-#if IS_ENABLED(CONFIG_HMM)
+#ifdef CONFIG_HMM_MIRROR
/* HMM needs to track a few things per mm */
struct hmm *hmm;
#endif
diff --git a/mm/Kconfig b/mm/Kconfig
index 4dbd718c8cf4..73676cb4693f 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -669,37 +669,17 @@ config ZONE_DEVICE
If FS_DAX is enabled, then say Y.
-config ARCH_HAS_HMM_MIRROR
- bool
- default y
- depends on (X86_64 || PPC64)
- depends on MMU && 64BIT
-
-config ARCH_HAS_HMM
- bool
- depends on (X86_64 || PPC64)
- depends on ZONE_DEVICE
- depends on MMU && 64BIT
- depends on MEMORY_HOTPLUG
- depends on MEMORY_HOTREMOVE
- depends on SPARSEMEM_VMEMMAP
- default y
-
config MIGRATE_VMA_HELPER
bool
config DEV_PAGEMAP_OPS
bool
-config HMM
- bool
- select MMU_NOTIFIER
- select MIGRATE_VMA_HELPER
-
config HMM_MIRROR
bool "HMM mirror CPU page table into a device page table"
- depends on ARCH_HAS_HMM
- select HMM
+ depends on MMU
+ select MMU_NOTIFIER
+ select MIGRATE_VMA_HELPER
help
Select HMM_MIRROR if you want to mirror range of the CPU page table of a
process into a device page table. Here, mirror means "keep synchronized".
@@ -721,7 +701,6 @@ config DEVICE_PUBLIC
bool "Addressable device memory (like GPU memory)"
depends on ARCH_HAS_HMM
depends on BROKEN
- select HMM
select DEV_PAGEMAP_OPS
help
diff --git a/mm/Makefile b/mm/Makefile
index ac5e5ba78874..91c99040065c 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -102,5 +102,5 @@ obj-$(CONFIG_FRAME_VECTOR) += frame_vector.o
obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o
obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o
obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o
-obj-$(CONFIG_HMM) += hmm.o
+obj-$(CONFIG_HMM_MIRROR) += hmm.o
obj-$(CONFIG_MEMFD_CREATE) += memfd.o
diff --git a/mm/hmm.c b/mm/hmm.c
index 5b2e9bb6063a..8d50c482469c 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -26,7 +26,6 @@
#include <linux/mmu_notifier.h>
#include <linux/memory_hotplug.h>
-#if IS_ENABLED(CONFIG_HMM_MIRROR)
static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
/**
@@ -1289,4 +1288,3 @@ long hmm_range_dma_unmap(struct hmm_range *range,
return cpages;
}
EXPORT_SYMBOL(hmm_range_dma_unmap);
-#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
--
2.20.1
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