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of/address: Introduce of_dma_get_max_cpu_address()
commit 964db79d6c
upstream
Introduce of_dma_get_max_cpu_address(), which provides the highest CPU
physical address addressable by all DMA masters in the system. It's
specially useful for setting memory zones sizes at early boot time.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20201119175400.9995-4-nsaenzjulienne@suse.de
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 49 additions and 0 deletions
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@ -1024,6 +1024,48 @@ int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map)
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}
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#endif /* CONFIG_HAS_DMA */
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/**
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* of_dma_get_max_cpu_address - Gets highest CPU address suitable for DMA
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* @np: The node to start searching from or NULL to start from the root
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*
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* Gets the highest CPU physical address that is addressable by all DMA masters
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* in the sub-tree pointed by np, or the whole tree if NULL is passed. If no
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* DMA constrained device is found, it returns PHYS_ADDR_MAX.
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*/
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phys_addr_t __init of_dma_get_max_cpu_address(struct device_node *np)
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{
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phys_addr_t max_cpu_addr = PHYS_ADDR_MAX;
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struct of_range_parser parser;
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phys_addr_t subtree_max_addr;
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struct device_node *child;
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struct of_range range;
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const __be32 *ranges;
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u64 cpu_end = 0;
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int len;
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if (!np)
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np = of_root;
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ranges = of_get_property(np, "dma-ranges", &len);
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if (ranges && len) {
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of_dma_range_parser_init(&parser, np);
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for_each_of_range(&parser, &range)
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if (range.cpu_addr + range.size > cpu_end)
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cpu_end = range.cpu_addr + range.size - 1;
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if (max_cpu_addr > cpu_end)
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max_cpu_addr = cpu_end;
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}
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for_each_available_child_of_node(np, child) {
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subtree_max_addr = of_dma_get_max_cpu_address(child);
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if (max_cpu_addr > subtree_max_addr)
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max_cpu_addr = subtree_max_addr;
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}
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return max_cpu_addr;
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}
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/**
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* of_dma_is_coherent - Check if device is coherent
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* @np: device node
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@ -558,6 +558,8 @@ int of_map_id(struct device_node *np, u32 id,
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const char *map_name, const char *map_mask_name,
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struct device_node **target, u32 *id_out);
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phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
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#else /* CONFIG_OF */
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static inline void of_core_init(void)
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@ -995,6 +997,11 @@ static inline int of_map_id(struct device_node *np, u32 id,
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return -EINVAL;
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}
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static inline phys_addr_t of_dma_get_max_cpu_address(struct device_node *np)
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{
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return PHYS_ADDR_MAX;
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}
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#define of_match_ptr(_ptr) NULL
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#define of_match_node(_matches, _node) NULL
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#endif /* CONFIG_OF */
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