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Date: Sat, 10 Dec 2016 12:29:57 +0800
From: Jason Liu <liu.h.jason@...il.com>
To: Jason Liu <jason.hui.liu@....com>
Cc: devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
labbott@...hat.com, frowand.list@...il.com, robh+dt@...nel.org
Subject: Re: [PATCH 1/1] of: of_reserved_mem: Ensure cma reserved region not
cross the low/high memory
2016-11-23 19:37 GMT+08:00 Jason Liu <jason.hui.liu@....com>:
> Need ensure the cma reserved region not cross the low/high memory boundary
> when using the dynamic allocation methond through device-tree, otherwise,
> kernel will fail to boot up when cma reserved region cross how/high mem.
>
> Signed-off-by: Jason Liu <jason.hui.liu@....com>
> Cc: Laura Abbott <labbott@...hat.com>
> Cc: Frank Rowand <frowand.list@...il.com>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: stable@...r.kernel.org
> ---
> drivers/of/of_reserved_mem.c | 42 +++++++++++++++++++++++++++++++----------
> include/linux/of_reserved_mem.h | 3 ++-
> 2 files changed, 34 insertions(+), 11 deletions(-)
Rob, any comments about this patch?
Jason Liu
>
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index 366d8c3..852345a 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -31,11 +31,15 @@
>
> #if defined(CONFIG_HAVE_MEMBLOCK)
> #include <linux/memblock.h>
> -int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> - phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
> - phys_addr_t *res_base)
> +int __init __weak early_init_dt_alloc_reserved_memory_arch(unsigned long node,
> + phys_addr_t size, phys_addr_t align, phys_addr_t start, phys_addr_t end,
> + bool nomap, phys_addr_t *res_base)
> {
> phys_addr_t base;
> + phys_addr_t highmem_start;
> +
> + highmem_start = __pa(high_memory - 1) + 1;
> +
> /*
> * We use __memblock_alloc_base() because memblock_alloc_base()
> * panic()s on allocation failure.
> @@ -53,15 +57,33 @@ int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> return -ENOMEM;
> }
>
> + /*
> + * Sanity check for the cma reserved region:If the reserved region
> + * crosses the low/high memory boundary, try to fix it up and then
> + * fall back to allocate the cma region from the low mememory space.
> + */
> +
> + if (IS_ENABLED(CONFIG_CMA)
> + && of_flat_dt_is_compatible(node, "shared-dma-pool")
> + && of_get_flat_dt_prop(node, "reusable", NULL) && !nomap) {
> + if (base < highmem_start && (base + size) > highmem_start) {
> + memblock_free(base, size);
> + base = memblock_alloc_range(size, align, start,
> + highmem_start, MEMBLOCK_NONE);
> + if (!base)
> + return -ENOMEM;
> + }
> + }
> +
> *res_base = base;
> if (nomap)
> return memblock_remove(base, size);
> return 0;
> }
> #else
> -int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> - phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
> - phys_addr_t *res_base)
> +int __init __weak early_init_dt_alloc_reserved_memory_arch(unsigned long node,
> + phys_addr_t size, phys_addr_t align, phys_addr_t start, phys_addr_t end,
> + bool nomap, phys_addr_t *res_base)
> {
> pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
> size, nomap ? " (nomap)" : "");
> @@ -155,8 +177,8 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
> end = start + dt_mem_next_cell(dt_root_size_cells,
> &prop);
>
> - ret = early_init_dt_alloc_reserved_memory_arch(size,
> - align, start, end, nomap, &base);
> + ret = early_init_dt_alloc_reserved_memory_arch(node,
> + size, align, start, end, nomap, &base);
> if (ret == 0) {
> pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n",
> uname, &base,
> @@ -167,8 +189,8 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
> }
>
> } else {
> - ret = early_init_dt_alloc_reserved_memory_arch(size, align,
> - 0, 0, nomap, &base);
> + ret = early_init_dt_alloc_reserved_memory_arch(node,
> + size, align, 0, 0, nomap, &base);
> if (ret == 0)
> pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n",
> uname, &base, (unsigned long)size / SZ_1M);
> diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
> index f8e1992..a6ee451 100644
> --- a/include/linux/of_reserved_mem.h
> +++ b/include/linux/of_reserved_mem.h
> @@ -34,7 +34,8 @@ int of_reserved_mem_device_init_by_idx(struct device *dev,
> struct device_node *np, int idx);
> void of_reserved_mem_device_release(struct device *dev);
>
> -int early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
> +int early_init_dt_alloc_reserved_memory_arch(unsigned long node,
> + phys_addr_t size,
> phys_addr_t align,
> phys_addr_t start,
> phys_addr_t end,
> --
> 1.8.3.2
>
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