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    Subject[PATCH 23/37] x86, lmb: Use lmb_memory_size()/lmb_free_memory_size() to get correct dma_reserve
    Date
    lmb_memory_size() will return memory size in lmb.memory.region.
    lmb_free_memory_size() will return free memory size in lmb.memory.region.

    So We can get exact reseved size in specified range.

    Set the size right after initmem_init(), because later bootmem API will
    get area above 16M. (except some fallback).

    Later after we remove the bootmem, We could call that just before paging_init().

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    arch/x86/include/asm/e820.h | 2 ++
    arch/x86/kernel/e820.c | 17 +++++++++++++++++
    arch/x86/kernel/setup.c | 1 +
    arch/x86/mm/init_64.c | 7 -------
    4 files changed, 20 insertions(+), 7 deletions(-)
    diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h
    index 6fbd8cd..f59db16 100644
    --- a/arch/x86/include/asm/e820.h
    +++ b/arch/x86/include/asm/e820.h
    @@ -118,6 +118,8 @@ extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);

    void init_lmb_memory(void);
    void fill_lmb_memory(void);
    +void find_lmb_dma_reserve(void);
    +
    extern void finish_e820_parsing(void);
    extern void e820_reserve_resources(void);
    extern void e820_reserve_resources_late(void);
    diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
    index c8edb78..c09b84b 100644
    --- a/arch/x86/kernel/e820.c
    +++ b/arch/x86/kernel/e820.c
    @@ -1110,3 +1110,20 @@ void __init fill_lmb_memory(void)
    lmb_analyze();
    lmb_dump_all();
    }
    +
    +void __init find_lmb_dma_reserve(void)
    +{
    +#ifdef CONFIG_X86_64
    + u64 free_size_pfn;
    + u64 mem_size_pfn;
    + /*
    + * need to find out used area below MAX_DMA_PFN
    + * need to use lmb to get free size in [0, MAX_DMA_PFN]
    + * at first, and assume boot_mem will not take below MAX_DMA_PFN
    + */
    + mem_size_pfn = lmb_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
    + free_size_pfn = lmb_free_memory_in_range(0, MAX_DMA_PFN << PAGE_SHIFT) >> PAGE_SHIFT;
    + set_dma_reserve(mem_size_pfn - free_size_pfn);
    +#endif
    +}
    +
    diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
    index 908864a..988677a 100644
    --- a/arch/x86/kernel/setup.c
    +++ b/arch/x86/kernel/setup.c
    @@ -1013,6 +1013,7 @@ void __init setup_arch(char **cmdline_p)
    #endif

    initmem_init(0, max_pfn, acpi, k8);
    + find_lmb_dma_reserve();
    #ifndef CONFIG_NO_BOOTMEM
    lmb_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
    #endif
    diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
    index bb9315f..abb79de 100644
    --- a/arch/x86/mm/init_64.c
    +++ b/arch/x86/mm/init_64.c
    @@ -53,8 +53,6 @@
    #include <asm/init.h>
    #include <linux/bootmem.h>

    -static unsigned long dma_reserve __initdata;
    -
    static int __init parse_direct_gbpages_off(char *arg)
    {
    direct_gbpages = 0;
    @@ -821,11 +819,6 @@ int __init reserve_bootmem_generic(unsigned long phys, unsigned long len,

    reserve_bootmem(phys, len, flags);

    - if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
    - dma_reserve += len / PAGE_SIZE;
    - set_dma_reserve(dma_reserve);
    - }
    -
    return 0;
    }
    #endif
    --
    1.6.4.2


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