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    SubjectRe: [PATCH 03/10] x86: add initialization code for DMA-API debugging
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    On Fri, 21 Nov 2008 17:26:03 +0100
    Joerg Roedel <joerg.roedel@amd.com> wrote:

    > Impact: creates necessary data structures for DMA-API debugging
    >
    > Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    > ---
    > arch/x86/include/asm/dma-mapping.h | 1 +
    > arch/x86/include/asm/dma_debug.h | 14 +++++
    > arch/x86/kernel/Makefile | 2 +
    > arch/x86/kernel/pci-dma-debug.c | 111 ++++++++++++++++++++++++++++++++++++
    > arch/x86/kernel/pci-dma.c | 2 +
    > 5 files changed, 130 insertions(+), 0 deletions(-)
    > create mode 100644 arch/x86/kernel/pci-dma-debug.c
    >
    > diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
    > index 7f225a4..83d7b7d 100644
    > --- a/arch/x86/include/asm/dma-mapping.h
    > +++ b/arch/x86/include/asm/dma-mapping.h
    > @@ -9,6 +9,7 @@
    > #include <linux/scatterlist.h>
    > #include <asm/io.h>
    > #include <asm/swiotlb.h>
    > +#include <asm/dma_debug.h>
    > #include <asm-generic/dma-coherent.h>
    >
    > extern dma_addr_t bad_dma_address;
    > diff --git a/arch/x86/include/asm/dma_debug.h b/arch/x86/include/asm/dma_debug.h
    > index d79f024..f2c3d53 100644
    > --- a/arch/x86/include/asm/dma_debug.h
    > +++ b/arch/x86/include/asm/dma_debug.h
    > @@ -38,4 +38,18 @@ struct dma_debug_entry {
    > int direction;
    > };
    >
    > +#ifdef CONFIG_DMA_API_DEBUG
    > +
    > +extern
    > +void dma_debug_init(void);
    > +
    > +#else /* CONFIG_DMA_API_DEBUG */
    > +
    > +static inline
    > +void dma_debug_init(void)
    > +{
    > +}
    > +
    > +#endif /* CONFIG_DMA_API_DEBUG */
    > +
    > #endif /* __ASM_X86_DMA_DEBUG */
    > diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
    > index e489ff9..6271cd2 100644
    > --- a/arch/x86/kernel/Makefile
    > +++ b/arch/x86/kernel/Makefile
    > @@ -105,6 +105,8 @@ microcode-$(CONFIG_MICROCODE_INTEL) += microcode_intel.o
    > microcode-$(CONFIG_MICROCODE_AMD) += microcode_amd.o
    > obj-$(CONFIG_MICROCODE) += microcode.o
    >
    > +obj-$(CONFIG_DMA_API_DEBUG) += pci-dma-debug.o
    > +
    > ###
    > # 64 bit specific files
    > ifeq ($(CONFIG_X86_64),y)
    > diff --git a/arch/x86/kernel/pci-dma-debug.c b/arch/x86/kernel/pci-dma-debug.c
    > new file mode 100644
    > index 0000000..c2d3408
    > --- /dev/null
    > +++ b/arch/x86/kernel/pci-dma-debug.c
    > @@ -0,0 +1,111 @@
    > +/*
    > + * Copyright (C) 2008 Advanced Micro Devices, Inc.
    > + *
    > + * Author: Joerg Roedel <joerg.roedel@amd.com>
    > + *
    > + * This program is free software; you can redistribute it and/or modify it
    > + * under the terms of the GNU General Public License version 2 as published
    > + * by the Free Software Foundation.
    > + *
    > + * This program is distributed in the hope that it will be useful,
    > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    > + * GNU General Public License for more details.
    > + *
    > + * You should have received a copy of the GNU General Public License
    > + * along with this program; if not, write to the Free Software
    > + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    > + */
    > +
    > +#include <linux/types.h>
    > +#include <linux/scatterlist.h>
    > +#include <linux/list.h>
    > +#include <linux/slab.h>
    > +#include <linux/spinlock.h>
    > +#include <linux/module.h>
    > +#include <linux/hardirq.h>
    > +#include <linux/dma-mapping.h>
    > +#include <asm/bug.h>
    > +#include <asm/dma-mapping.h>
    > +#include <asm/dma_debug.h>
    > +
    > +#define HASH_SIZE 256
    > +#define HASH_FN_SHIFT 20
    > +#define HASH_FN_MASK 0xffULL
    > +
    > +/* Hash list to save the allocated dma addresses */
    > +static struct list_head dma_entry_hash[HASH_SIZE];
    > +
    > +/* A slab cache to allocate dma_map_entries fast */
    > +static struct kmem_cache *dma_entry_cache;
    > +
    > +/* lock to protect the data structures */
    > +static DEFINE_SPINLOCK(dma_lock);
    > +
    > +static int hash_fn(struct dma_debug_entry *entry)
    > +{
    > + /*
    > + * Hash function is based on the dma address.
    > + * We use bits 20-27 here as the index into the hash
    > + */
    > + BUG_ON(entry->dev_addr == bad_dma_address);

    'bad_dma_address' is x86 specific. You already found it though.


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