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    Subject[PATCH 05/16] dma-debug: add initialization code
    Date
    Impact: add code to initialize dma-debug core data structures

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    include/linux/dma-debug.h | 14 +++++++++
    lib/dma-debug.c | 66 +++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 80 insertions(+), 0 deletions(-)

    diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
    index ce4ace7..345d538 100644
    --- a/include/linux/dma-debug.h
    +++ b/include/linux/dma-debug.h
    @@ -20,6 +20,20 @@
    #ifndef __DMA_DEBUG_H
    #define __DMA_DEBUG_H

    +#include <linux/types.h>
    +
    struct device;

    +#ifdef CONFIG_DMA_API_DEBUG
    +
    +extern void dma_debug_init(u32 num_entries);
    +
    +#else /* CONFIG_DMA_API_DEBUG */
    +
    +static inline void dma_debug_init(u32 num_entries)
    +{
    +}
    +
    +#endif /* CONFIG_DMA_API_DEBUG */
    +
    #endif /* __DMA_DEBUG_H */
    diff --git a/lib/dma-debug.c b/lib/dma-debug.c
    index c9e44e8..d46c76e 100644
    --- a/lib/dma-debug.c
    +++ b/lib/dma-debug.c
    @@ -21,6 +21,7 @@
    #include <linux/spinlock.h>
    #include <linux/types.h>
    #include <linux/list.h>
    +#include <linux/slab.h>

    #define HASH_SIZE 256
    #define HASH_FN_SHIFT 13
    @@ -196,3 +197,68 @@ static void dma_entry_free(struct dma_debug_entry *entry)
    spin_unlock_irqrestore(&free_entries_lock, flags);
    }

    +/*
    + * DMA-API debugging init code
    + *
    + * The init code does two things:
    + * 1. Initialize core data structures
    + * 2. Preallocate a given number of dma_debug_entry structs
    + */
    +
    +static int prealloc_memory(u32 num_entries)
    +{
    + struct dma_debug_entry *entry, *next_entry;
    + int i;
    +
    + for (i = 0; i < num_entries; ++i) {
    + entry = kzalloc(sizeof(*entry), GFP_KERNEL);
    + if (!entry)
    + goto out_err;
    +
    + list_add_tail(&entry->list, &free_entries);
    + }
    +
    + num_free_entries = num_entries;
    + min_free_entries = num_entries;
    +
    + printk(KERN_INFO "DMA-API: preallocated %d debug entries\n",
    + num_entries);
    +
    + return 0;
    +
    +out_err:
    +
    + list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
    + list_del(&entry->list);
    + kfree(entry);
    + }
    +
    + return -ENOMEM;
    +}
    +
    +/*
    + * Let the architectures decide how many entries should be preallocated.
    + */
    +void dma_debug_init(u32 num_entries)
    +{
    + int i;
    +
    + if (global_disable)
    + return;
    +
    + for (i = 0; i < HASH_SIZE; ++i) {
    + INIT_LIST_HEAD(&dma_entry_hash[i].list);
    + dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
    + }
    +
    + if (prealloc_memory(num_entries) != 0) {
    + printk(KERN_ERR "DMA-API: debugging out of memory error "
    + "- disabled\n");
    + global_disable = true;
    +
    + return;
    + }
    +
    + printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
    +}
    +
    --
    1.5.6.4



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