[PATCH 1/3] dma-debug: move initialization to common code

From: Christoph Hellwig
Date: Tue Apr 24 2018 - 10:03:00 EST

Most mainstream architectures are using 65536 entries, so lets stick to
that. If someone is really desperate to override it that can still be
done through <asm/dma-mapping.h>, but I'd rather see a really good
rationale for that.

dma_debug_init is now called as a core_initcall, which for many
architectures means much earlier, and provides dma-debug functionality
earlier in the boot process. This should be safe as it only relies
on the memory allocator already being available.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/arm/mm/dma-mapping-nommu.c | 9 ---------
arch/arm/mm/dma-mapping.c | 9 ---------
arch/arm64/mm/dma-mapping.c | 10 ----------
arch/c6x/kernel/dma.c | 11 -----------
arch/ia64/kernel/dma-mapping.c | 10 ----------
arch/microblaze/kernel/dma.c | 11 -----------
arch/mips/mm/dma-default.c | 10 ----------
arch/openrisc/kernel/dma.c | 11 -----------
arch/powerpc/kernel/dma.c | 3 ---
arch/s390/pci/pci_dma.c | 9 ---------
arch/sh/mm/consistent.c | 9 ---------
arch/sparc/kernel/Makefile | 2 --
arch/sparc/kernel/dma.c | 13 -------------
arch/x86/kernel/pci-dma.c | 4 ----
arch/xtensa/kernel/pci-dma.c | 9 ---------
include/linux/dma-debug.h | 6 ------
lib/dma-debug.c | 21 ++++++++++++++-------
17 files changed, 14 insertions(+), 143 deletions(-)
delete mode 100644 arch/sparc/kernel/dma.c

diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c
index 619f24a42d09..f448a0663b10 100644
--- a/arch/arm/mm/dma-mapping-nommu.c
+++ b/arch/arm/mm/dma-mapping-nommu.c
@@ -241,12 +241,3 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
void arch_teardown_dma_ops(struct device *dev)
{
}
-
-#define PREALLOC_DMA_DEBUG_ENTRIES 4096
-
-static int __init dma_debug_do_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-core_initcall(dma_debug_do_init);
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 8c398fedbbb6..c26bf83f44ca 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1165,15 +1165,6 @@ int arm_dma_supported(struct device *dev, u64 mask)
return __dma_supported(dev, mask, false);
}

-#define PREALLOC_DMA_DEBUG_ENTRIES 4096
-
-static int __init dma_debug_do_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-core_initcall(dma_debug_do_init);
-
#ifdef CONFIG_ARM_DMA_USE_IOMMU

static int __dma_info_to_prot(enum dma_data_direction dir, unsigned long attrs)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index a96ec0181818..db01f2709842 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -508,16 +508,6 @@ static int __init arm64_dma_init(void)
}
arch_initcall(arm64_dma_init);

-#define PREALLOC_DMA_DEBUG_ENTRIES 4096
-
-static int __init dma_debug_do_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-fs_initcall(dma_debug_do_init);
-
-
#ifdef CONFIG_IOMMU_DMA
#include <linux/dma-iommu.h>
#include <linux/platform_device.h>
diff --git a/arch/c6x/kernel/dma.c b/arch/c6x/kernel/dma.c
index 9fff8be75f58..31e1a9ec3a9c 100644
--- a/arch/c6x/kernel/dma.c
+++ b/arch/c6x/kernel/dma.c
@@ -136,14 +136,3 @@ const struct dma_map_ops c6x_dma_ops = {
.sync_sg_for_cpu = c6x_dma_sync_sg_for_cpu,
};
EXPORT_SYMBOL(c6x_dma_ops);
-
-/* Number of entries preallocated for DMA-API debugging */
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
-
- return 0;
-}
-fs_initcall(dma_init);
diff --git a/arch/ia64/kernel/dma-mapping.c b/arch/ia64/kernel/dma-mapping.c
index f2d57e66fd86..7a471d8d67d4 100644
--- a/arch/ia64/kernel/dma-mapping.c
+++ b/arch/ia64/kernel/dma-mapping.c
@@ -9,16 +9,6 @@ int iommu_detected __read_mostly;
const struct dma_map_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);

-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
-
- return 0;
-}
-fs_initcall(dma_init);
-
const struct dma_map_ops *dma_get_ops(struct device *dev)
{
return dma_ops;
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c
index c91e8cef98dd..3145e7dc8ab1 100644
--- a/arch/microblaze/kernel/dma.c
+++ b/arch/microblaze/kernel/dma.c
@@ -184,14 +184,3 @@ const struct dma_map_ops dma_nommu_ops = {
.sync_sg_for_device = dma_nommu_sync_sg_for_device,
};
EXPORT_SYMBOL(dma_nommu_ops);
-
-/* Number of entries preallocated for DMA-API debugging */
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
-
- return 0;
-}
-fs_initcall(dma_init);
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index dcafa43613b6..f9fef0028ca2 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -402,13 +402,3 @@ static const struct dma_map_ops mips_default_dma_map_ops = {

const struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;
EXPORT_SYMBOL(mips_dma_map_ops);
-
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init mips_dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
-
- return 0;
-}
-fs_initcall(mips_dma_init);
diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c
index a945f00011b4..ec7fd45704d2 100644
--- a/arch/openrisc/kernel/dma.c
+++ b/arch/openrisc/kernel/dma.c
@@ -247,14 +247,3 @@ const struct dma_map_ops or1k_dma_map_ops = {
.sync_single_for_device = or1k_sync_single_for_device,
};
EXPORT_SYMBOL(or1k_dma_map_ops);
-
-/* Number of entries preallocated for DMA-API debugging */
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
-
- return 0;
-}
-fs_initcall(dma_init);
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index da20569de9d4..138157deeadf 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -309,8 +309,6 @@ int dma_set_coherent_mask(struct device *dev, u64 mask)
}
EXPORT_SYMBOL(dma_set_coherent_mask);

-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
int dma_set_mask(struct device *dev, u64 dma_mask)
{
if (ppc_md.dma_set_mask)
@@ -361,7 +359,6 @@ EXPORT_SYMBOL_GPL(dma_get_required_mask);

static int __init dma_init(void)
{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
#ifdef CONFIG_PCI
dma_debug_add_bus(&pci_bus_type);
#endif
diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
index 2d15d84c20ed..5dee7a922589 100644
--- a/arch/s390/pci/pci_dma.c
+++ b/arch/s390/pci/pci_dma.c
@@ -668,15 +668,6 @@ void zpci_dma_exit(void)
kmem_cache_destroy(dma_region_table_cache);
}

-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init dma_debug_do_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-fs_initcall(dma_debug_do_init);
-
const struct dma_map_ops s390_pci_dma_ops = {
.alloc = s390_dma_alloc,
.free = s390_dma_free,
diff --git a/arch/sh/mm/consistent.c b/arch/sh/mm/consistent.c
index 8ce98691d822..35ea3099a3b6 100644
--- a/arch/sh/mm/consistent.c
+++ b/arch/sh/mm/consistent.c
@@ -20,18 +20,9 @@
#include <asm/cacheflush.h>
#include <asm/addrspace.h>

-#define PREALLOC_DMA_DEBUG_ENTRIES 4096
-
const struct dma_map_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);

-static int __init dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-fs_initcall(dma_init);
-
void *dma_generic_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp,
unsigned long attrs)
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index 76cb57750dda..84cfc5a428d6 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -74,8 +74,6 @@ obj-$(CONFIG_SPARC64) += pcr.o
obj-$(CONFIG_SPARC64) += nmi.o
obj-$(CONFIG_SPARC64_SMP) += cpumap.o

-obj-y += dma.o
-
obj-$(CONFIG_PCIC_PCI) += pcic.o
obj-$(CONFIG_LEON_PCI) += leon_pci.o
obj-$(CONFIG_SPARC_GRPCI2)+= leon_pci_grpci2.o
diff --git a/arch/sparc/kernel/dma.c b/arch/sparc/kernel/dma.c
deleted file mode 100644
index f73e7597c971..000000000000
--- a/arch/sparc/kernel/dma.c
+++ /dev/null
@@ -1,13 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/kernel.h>
-#include <linux/dma-mapping.h>
-#include <linux/dma-debug.h>
-
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 15)
-
-static int __init dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-fs_initcall(dma_init);
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 77625b60a510..bcbaa2e8031e 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -55,9 +55,6 @@ struct device x86_dma_fallback_dev = {
};
EXPORT_SYMBOL(x86_dma_fallback_dev);

-/* Number of entries preallocated for DMA-API debugging */
-#define PREALLOC_DMA_DEBUG_ENTRIES 65536
-
void __init pci_iommu_alloc(void)
{
struct iommu_table_entry *p;
@@ -189,7 +186,6 @@ EXPORT_SYMBOL(arch_dma_supported);
static int __init pci_iommu_init(void)
{
struct iommu_table_entry *p;
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);

#ifdef CONFIG_PCI
dma_debug_add_bus(&pci_bus_type);
diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c
index 732631ce250f..392b4a80ebc2 100644
--- a/arch/xtensa/kernel/pci-dma.c
+++ b/arch/xtensa/kernel/pci-dma.c
@@ -261,12 +261,3 @@ const struct dma_map_ops xtensa_dma_map_ops = {
.mapping_error = xtensa_dma_mapping_error,
};
EXPORT_SYMBOL(xtensa_dma_map_ops);
-
-#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
-
-static int __init xtensa_dma_init(void)
-{
- dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
- return 0;
-}
-fs_initcall(xtensa_dma_init);
diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
index c7d844f09c3a..a785f2507159 100644
--- a/include/linux/dma-debug.h
+++ b/include/linux/dma-debug.h
@@ -30,8 +30,6 @@ struct bus_type;

extern void dma_debug_add_bus(struct bus_type *bus);

-extern void dma_debug_init(u32 num_entries);
-
extern int dma_debug_resize_entries(u32 num_entries);

extern void debug_dma_map_page(struct device *dev, struct page *page,
@@ -100,10 +98,6 @@ static inline void dma_debug_add_bus(struct bus_type *bus)
{
}

-static inline void dma_debug_init(u32 num_entries)
-{
-}
-
static inline int dma_debug_resize_entries(u32 num_entries)
{
return 0;
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 7f5cdc1e6b29..712a897174e4 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -41,6 +41,11 @@
#define HASH_FN_SHIFT 13
#define HASH_FN_MASK (HASH_SIZE - 1)

+/* allow architectures to override this if absolutely required */
+#ifndef PREALLOC_DMA_DEBUG_ENTRIES
+#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
+#endif
+
enum {
dma_debug_single,
dma_debug_page,
@@ -1004,18 +1009,16 @@ void dma_debug_add_bus(struct bus_type *bus)
bus_register_notifier(bus, nb);
}

-/*
- * Let the architectures decide how many entries should be preallocated.
- */
-void dma_debug_init(u32 num_entries)
+static int dma_debug_init(void)
{
+ u32 num_entries;
int i;

/* Do not use dma_debug_initialized here, since we really want to be
* called to set dma_debug_initialized
*/
if (global_disable)
- return;
+ return 0;

for (i = 0; i < HASH_SIZE; ++i) {
INIT_LIST_HEAD(&dma_entry_hash[i].list);
@@ -1026,17 +1029,19 @@ void dma_debug_init(u32 num_entries)
pr_err("DMA-API: error creating debugfs entries - disabling\n");
global_disable = true;

- return;
+ return 0;
}

if (req_entries)
num_entries = req_entries;
+ else
+ num_entries = PREALLOC_DMA_DEBUG_ENTRIES;

if (prealloc_memory(num_entries) != 0) {
pr_err("DMA-API: debugging out of memory error - disabled\n");
global_disable = true;

- return;
+ return 0;
}

nr_total_entries = num_free_entries;
@@ -1044,7 +1049,9 @@ void dma_debug_init(u32 num_entries)
dma_debug_initialized = true;

pr_info("DMA-API: debugging enabled by kernel config\n");
+ return 0;
}
+core_initcall(dma_debug_init);

static __init int dma_debug_cmdline(char *str)
{
--
2.17.0

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