linux-4.4.1/cma_declare_contiguous()
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開始行:
*参照元 [#fa1a18a0]
#backlinks
*説明 [#ef6a6611]
-パス: [[linux-4.4.1/mm/cma.c]]
-FIXME: これは何？
--説明
**引数 [#ifd6864d]
-phys_addr_t base
--
--[[linux-4.4.1/phys_addr_t]]
-phys_addr_t size
--
-phys_addr_t limit
--
-phys_addr_t alignment
--
-unsigned int order_per_bit
--
-bool fixed
--
-struct cma **res_cma
--
--[[linux-4.4.1/cma]]
**返り値 [#m5152279]
-int
--
**参考 [#q668b5e2]
*実装 [#ka25b461]
/**
* cma_declare_contiguous() - reserve custom contiguous ...
* @base: Base address of the reserved area optional, us...
* @size: Size of the reserved area (in bytes),
* @limit: End address of the reserved memory (optional,...
* @alignment: Alignment for the CMA area, should be pow...
* @order_per_bit: Order of pages represented by one bit...
* @fixed: hint about where to place the reserved area
* @res_cma: Pointer to store the created cma region.
*
* This function reserves memory from early allocator. I...
* called by arch specific code once the early allocator...
* has been activated and all other subsystems have alre...
* memory. This function allows to create custom reserve...
*
* If @fixed is true, reserve contiguous area at exactly...
* reserve in range from @base to @limit.
*/
int __init cma_declare_contiguous(phys_addr_t base,
phys_addr_t size, phys_addr_t limit,
phys_addr_t alignment, unsigned int order_per_bit,
bool fixed, struct cma **res_cma)
{
phys_addr_t memblock_end = memblock_end_of_DRAM();
phys_addr_t highmem_start;
int ret = 0;
-
--[[linux-4.4.1/__init]]
--[[linux-4.4.1/memblock_end_of_DRAM()]]
#ifdef CONFIG_X86
/*
* high_memory isn't direct mapped memory so retrieving...
* address isn't appropriate. But it would be useful t...
* physical address of the highmem boundary so it's jus...
* the physical address from it. On x86 there is a val...
* this case, so the following workaround is needed to ...
*/
highmem_start = __pa_nodebug(high_memory);
#else
highmem_start = __pa(high_memory);
#endif
-
--[[linux-4.4.1/CONFIG_X86]]
--[[linux-4.4.1/__pa_nodebug()]]
--[[linux-4.4.1/high_memory(global)]]
--[[linux-4.4.1/__pa()]]
pr_debug("%s(size %pa, base %pa, limit %pa alignment %p...
__func__, &size, &base, &limit, &alignment);
-
--[[linux-4.4.1/pr_debug()]]
if (cma_area_count == ARRAY_SIZE(cma_areas)) {
pr_err("Not enough slots for CMA reserved regions!\n");
return -ENOSPC;
}
-
--[[linux-4.4.1/ARRAY_SIZE()]]
--[[linux-4.4.1/cma_areas(global)]]
--[[linux-4.4.1/pr_err()]]
if (!size)
return -EINVAL;
if (alignment && !is_power_of_2(alignment))
return -EINVAL;
-
--[[linux-4.4.1/is_power_of_2()]]
/*
* Sanitise input arguments.
* Pages both ends in CMA area could be merged into adj...
* migratetype page by page allocator's buddy algorithm...
* you couldn't get a contiguous memory, which is not w...
*/
alignment = max(alignment,
(phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock...
base = ALIGN(base, alignment);
size = ALIGN(size, alignment);
limit &= ~(alignment - 1);
-
--[[linux-4.4.1/ALIGN()]]
if (!base)
fixed = false;
/* size should be aligned with order_per_bit */
if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit))
return -EINVAL;
-
--[[linux-4.4.1/IS_ALIGNED()]]
/*
* If allocating at a fixed base the request region mus...
* low/high memory boundary.
*/
if (fixed && base < highmem_start && base + size > high...
ret = -EINVAL;
pr_err("Region at %pa defined on low/high memory bound...
&base, &highmem_start);
goto err;
}
-
--[[linux-4.4.1/highmem_start(global)]]
/*
* If the limit is unspecified or above the memblock en...
* value will be the memblock end. Set it explicitly to...
* checks.
*/
if (limit == 0 || limit > memblock_end)
limit = memblock_end;
/* Reserve memory */
if (fixed) {
if (memblock_is_region_reserved(base, size) ||
memblock_reserve(base, size) < 0) {
ret = -EBUSY;
goto err;
}
-
--[[linux-4.4.1/memblock_is_region_reserved()]]
--[[linux-4.4.1/memblock_reserve()]]
} else {
phys_addr_t addr = 0;
/*
* All pages in the reserved area must come from the s...
* If the requested region crosses the low/high memory...
* try allocating from high memory first and fall back...
* memory in case of failure.
*/
if (base < highmem_start && limit > highmem_start) {
addr = memblock_alloc_range(size, alignment,
highmem_start, limit,
MEMBLOCK_NONE);
limit = highmem_start;
}
-
--[[linux-4.4.1/memblock_alloc_range()]]
if (!addr) {
addr = memblock_alloc_range(size, alignment, base,
limit,
MEMBLOCK_NONE);
if (!addr) {
ret = -ENOMEM;
goto err;
}
}
/*
* kmemleak scans/reads tracked objects for pointers t...
* objects but this address isn't mapped and accessible
*/
kmemleak_ignore(phys_to_virt(addr));
base = addr;
-
--[[linux-4.4.1/kmemleak_ignore()]]
--[[linux-4.4.1/phys_to_virt()]]
}
ret = cma_init_reserved_mem(base, size, order_per_bit, ...
if (ret)
goto err;
-
--[[linux-4.4.1/cma_init_reserved_mem()]]
pr_info("Reserved %ld MiB at %pa\n", (unsigned long)siz...
&base);
return 0;
-
--[[linux-4.4.1/pr_info()]]
err:
pr_err("Failed to reserve %ld MiB\n", (unsigned long)si...
return ret;
-
--[[linux-4.4.1/pr_err()]]
}
*コメント [#r8e8cade]
終了行:
*参照元 [#fa1a18a0]
#backlinks
*説明 [#ef6a6611]
-パス: [[linux-4.4.1/mm/cma.c]]
-FIXME: これは何？
--説明
**引数 [#ifd6864d]
-phys_addr_t base
--
--[[linux-4.4.1/phys_addr_t]]
-phys_addr_t size
--
-phys_addr_t limit
--
-phys_addr_t alignment
--
-unsigned int order_per_bit
--
-bool fixed
--
-struct cma **res_cma
--
--[[linux-4.4.1/cma]]
**返り値 [#m5152279]
-int
--
**参考 [#q668b5e2]
*実装 [#ka25b461]
/**
* cma_declare_contiguous() - reserve custom contiguous ...
* @base: Base address of the reserved area optional, us...
* @size: Size of the reserved area (in bytes),
* @limit: End address of the reserved memory (optional,...
* @alignment: Alignment for the CMA area, should be pow...
* @order_per_bit: Order of pages represented by one bit...
* @fixed: hint about where to place the reserved area
* @res_cma: Pointer to store the created cma region.
*
* This function reserves memory from early allocator. I...
* called by arch specific code once the early allocator...
* has been activated and all other subsystems have alre...
* memory. This function allows to create custom reserve...
*
* If @fixed is true, reserve contiguous area at exactly...
* reserve in range from @base to @limit.
*/
int __init cma_declare_contiguous(phys_addr_t base,
phys_addr_t size, phys_addr_t limit,
phys_addr_t alignment, unsigned int order_per_bit,
bool fixed, struct cma **res_cma)
{
phys_addr_t memblock_end = memblock_end_of_DRAM();
phys_addr_t highmem_start;
int ret = 0;
-
--[[linux-4.4.1/__init]]
--[[linux-4.4.1/memblock_end_of_DRAM()]]
#ifdef CONFIG_X86
/*
* high_memory isn't direct mapped memory so retrieving...
* address isn't appropriate. But it would be useful t...
* physical address of the highmem boundary so it's jus...
* the physical address from it. On x86 there is a val...
* this case, so the following workaround is needed to ...
*/
highmem_start = __pa_nodebug(high_memory);
#else
highmem_start = __pa(high_memory);
#endif
-
--[[linux-4.4.1/CONFIG_X86]]
--[[linux-4.4.1/__pa_nodebug()]]
--[[linux-4.4.1/high_memory(global)]]
--[[linux-4.4.1/__pa()]]
pr_debug("%s(size %pa, base %pa, limit %pa alignment %p...
__func__, &size, &base, &limit, &alignment);
-
--[[linux-4.4.1/pr_debug()]]
if (cma_area_count == ARRAY_SIZE(cma_areas)) {
pr_err("Not enough slots for CMA reserved regions!\n");
return -ENOSPC;
}
-
--[[linux-4.4.1/ARRAY_SIZE()]]
--[[linux-4.4.1/cma_areas(global)]]
--[[linux-4.4.1/pr_err()]]
if (!size)
return -EINVAL;
if (alignment && !is_power_of_2(alignment))
return -EINVAL;
-
--[[linux-4.4.1/is_power_of_2()]]
/*
* Sanitise input arguments.
* Pages both ends in CMA area could be merged into adj...
* migratetype page by page allocator's buddy algorithm...
* you couldn't get a contiguous memory, which is not w...
*/
alignment = max(alignment,
(phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock...
base = ALIGN(base, alignment);
size = ALIGN(size, alignment);
limit &= ~(alignment - 1);
-
--[[linux-4.4.1/ALIGN()]]
if (!base)
fixed = false;
/* size should be aligned with order_per_bit */
if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit))
return -EINVAL;
-
--[[linux-4.4.1/IS_ALIGNED()]]
/*
* If allocating at a fixed base the request region mus...
* low/high memory boundary.
*/
if (fixed && base < highmem_start && base + size > high...
ret = -EINVAL;
pr_err("Region at %pa defined on low/high memory bound...
&base, &highmem_start);
goto err;
}
-
--[[linux-4.4.1/highmem_start(global)]]
/*
* If the limit is unspecified or above the memblock en...
* value will be the memblock end. Set it explicitly to...
* checks.
*/
if (limit == 0 || limit > memblock_end)
limit = memblock_end;
/* Reserve memory */
if (fixed) {
if (memblock_is_region_reserved(base, size) ||
memblock_reserve(base, size) < 0) {
ret = -EBUSY;
goto err;
}
-
--[[linux-4.4.1/memblock_is_region_reserved()]]
--[[linux-4.4.1/memblock_reserve()]]
} else {
phys_addr_t addr = 0;
/*
* All pages in the reserved area must come from the s...
* If the requested region crosses the low/high memory...
* try allocating from high memory first and fall back...
* memory in case of failure.
*/
if (base < highmem_start && limit > highmem_start) {
addr = memblock_alloc_range(size, alignment,
highmem_start, limit,
MEMBLOCK_NONE);
limit = highmem_start;
}
-
--[[linux-4.4.1/memblock_alloc_range()]]
if (!addr) {
addr = memblock_alloc_range(size, alignment, base,
limit,
MEMBLOCK_NONE);
if (!addr) {
ret = -ENOMEM;
goto err;
}
}
/*
* kmemleak scans/reads tracked objects for pointers t...
* objects but this address isn't mapped and accessible
*/
kmemleak_ignore(phys_to_virt(addr));
base = addr;
-
--[[linux-4.4.1/kmemleak_ignore()]]
--[[linux-4.4.1/phys_to_virt()]]
}
ret = cma_init_reserved_mem(base, size, order_per_bit, ...
if (ret)
goto err;
-
--[[linux-4.4.1/cma_init_reserved_mem()]]
pr_info("Reserved %ld MiB at %pa\n", (unsigned long)siz...
&base);
return 0;
-
--[[linux-4.4.1/pr_info()]]
err:
pr_err("Failed to reserve %ld MiB\n", (unsigned long)si...
return ret;
-
--[[linux-4.4.1/pr_err()]]
}
*コメント [#r8e8cade]
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