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![Christoph Hellwig](/assets/img/avatar_default.png)
With each bus implementing its own DMA configuration callback, there is no need for bus to explicitly set the force_dma flag. Modify the of_dma_configure function to accept an input parameter which specifies if implicit DMA configuration is required when it is not described by the firmware. Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> # PCI parts Reviewed-by: Rob Herring <robh@kernel.org> [hch: tweaked the changelog a bit] Signed-off-by: Christoph Hellwig <hch@lst.de>
421 lines
11 KiB
C
421 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Device tree based initialization code for reserved memory.
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*
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* Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.
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* Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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* Author: Marek Szyprowski <m.szyprowski@samsung.com>
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* Author: Josh Cartwright <joshc@codeaurora.org>
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*/
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#define pr_fmt(fmt) "OF: reserved mem: " fmt
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <linux/mm.h>
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#include <linux/sizes.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/sort.h>
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#include <linux/slab.h>
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#define MAX_RESERVED_REGIONS 32
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static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
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static int reserved_mem_count;
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#if defined(CONFIG_HAVE_MEMBLOCK)
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#include <linux/memblock.h>
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int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
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phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
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phys_addr_t *res_base)
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{
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phys_addr_t base;
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/*
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* We use __memblock_alloc_base() because memblock_alloc_base()
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* panic()s on allocation failure.
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*/
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end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
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base = __memblock_alloc_base(size, align, end);
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if (!base)
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return -ENOMEM;
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/*
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* Check if the allocated region fits in to start..end window
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*/
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if (base < start) {
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memblock_free(base, size);
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return -ENOMEM;
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}
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*res_base = base;
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if (nomap)
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return memblock_remove(base, size);
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return 0;
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}
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#else
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int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
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phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
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phys_addr_t *res_base)
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{
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pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
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size, nomap ? " (nomap)" : "");
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return -ENOSYS;
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}
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#endif
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/**
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* res_mem_save_node() - save fdt node for second pass initialization
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*/
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void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
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phys_addr_t base, phys_addr_t size)
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{
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struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
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if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
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pr_err("not enough space all defined regions.\n");
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return;
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}
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rmem->fdt_node = node;
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rmem->name = uname;
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rmem->base = base;
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rmem->size = size;
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reserved_mem_count++;
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return;
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}
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/**
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* res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
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* and 'alloc-ranges' properties
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*/
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static int __init __reserved_mem_alloc_size(unsigned long node,
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const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)
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{
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int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
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phys_addr_t start = 0, end = 0;
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phys_addr_t base = 0, align = 0, size;
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int len;
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const __be32 *prop;
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int nomap;
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int ret;
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prop = of_get_flat_dt_prop(node, "size", &len);
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if (!prop)
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return -EINVAL;
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if (len != dt_root_size_cells * sizeof(__be32)) {
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pr_err("invalid size property in '%s' node.\n", uname);
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return -EINVAL;
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}
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size = dt_mem_next_cell(dt_root_size_cells, &prop);
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nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
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prop = of_get_flat_dt_prop(node, "alignment", &len);
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if (prop) {
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if (len != dt_root_addr_cells * sizeof(__be32)) {
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pr_err("invalid alignment property in '%s' node.\n",
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uname);
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return -EINVAL;
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}
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align = dt_mem_next_cell(dt_root_addr_cells, &prop);
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}
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/* Need adjust the alignment to satisfy the CMA requirement */
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if (IS_ENABLED(CONFIG_CMA)
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&& of_flat_dt_is_compatible(node, "shared-dma-pool")
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&& of_get_flat_dt_prop(node, "reusable", NULL)
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&& !of_get_flat_dt_prop(node, "no-map", NULL)) {
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unsigned long order =
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max_t(unsigned long, MAX_ORDER - 1, pageblock_order);
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align = max(align, (phys_addr_t)PAGE_SIZE << order);
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}
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prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
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if (prop) {
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if (len % t_len != 0) {
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pr_err("invalid alloc-ranges property in '%s', skipping node.\n",
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uname);
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return -EINVAL;
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}
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base = 0;
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while (len > 0) {
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start = dt_mem_next_cell(dt_root_addr_cells, &prop);
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end = start + dt_mem_next_cell(dt_root_size_cells,
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&prop);
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ret = early_init_dt_alloc_reserved_memory_arch(size,
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align, start, end, nomap, &base);
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if (ret == 0) {
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pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n",
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uname, &base,
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(unsigned long)size / SZ_1M);
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break;
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}
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len -= t_len;
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}
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} else {
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ret = early_init_dt_alloc_reserved_memory_arch(size, align,
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0, 0, nomap, &base);
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if (ret == 0)
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pr_debug("allocated memory for '%s' node: base %pa, size %ld MiB\n",
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uname, &base, (unsigned long)size / SZ_1M);
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}
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if (base == 0) {
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pr_info("failed to allocate memory for node '%s'\n", uname);
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return -ENOMEM;
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}
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*res_base = base;
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*res_size = size;
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return 0;
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}
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static const struct of_device_id __rmem_of_table_sentinel
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__used __section(__reservedmem_of_table_end);
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/**
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* res_mem_init_node() - call region specific reserved memory init code
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*/
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static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
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{
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extern const struct of_device_id __reservedmem_of_table[];
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const struct of_device_id *i;
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for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
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reservedmem_of_init_fn initfn = i->data;
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const char *compat = i->compatible;
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if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
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continue;
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if (initfn(rmem) == 0) {
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pr_info("initialized node %s, compatible id %s\n",
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rmem->name, compat);
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return 0;
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}
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}
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return -ENOENT;
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}
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static int __init __rmem_cmp(const void *a, const void *b)
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{
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const struct reserved_mem *ra = a, *rb = b;
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if (ra->base < rb->base)
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return -1;
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if (ra->base > rb->base)
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return 1;
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return 0;
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}
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static void __init __rmem_check_for_overlap(void)
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{
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int i;
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if (reserved_mem_count < 2)
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return;
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sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
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__rmem_cmp, NULL);
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for (i = 0; i < reserved_mem_count - 1; i++) {
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struct reserved_mem *this, *next;
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this = &reserved_mem[i];
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next = &reserved_mem[i + 1];
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if (!(this->base && next->base))
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continue;
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if (this->base + this->size > next->base) {
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phys_addr_t this_end, next_end;
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this_end = this->base + this->size;
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next_end = next->base + next->size;
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pr_err("OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
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this->name, &this->base, &this_end,
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next->name, &next->base, &next_end);
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}
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}
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}
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/**
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* fdt_init_reserved_mem - allocate and init all saved reserved memory regions
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*/
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void __init fdt_init_reserved_mem(void)
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{
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int i;
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/* check for overlapping reserved regions */
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__rmem_check_for_overlap();
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for (i = 0; i < reserved_mem_count; i++) {
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struct reserved_mem *rmem = &reserved_mem[i];
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unsigned long node = rmem->fdt_node;
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int len;
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const __be32 *prop;
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int err = 0;
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prop = of_get_flat_dt_prop(node, "phandle", &len);
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if (!prop)
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prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
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if (prop)
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rmem->phandle = of_read_number(prop, len/4);
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if (rmem->size == 0)
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err = __reserved_mem_alloc_size(node, rmem->name,
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&rmem->base, &rmem->size);
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if (err == 0)
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__reserved_mem_init_node(rmem);
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}
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}
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static inline struct reserved_mem *__find_rmem(struct device_node *node)
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{
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unsigned int i;
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if (!node->phandle)
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return NULL;
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for (i = 0; i < reserved_mem_count; i++)
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if (reserved_mem[i].phandle == node->phandle)
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return &reserved_mem[i];
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return NULL;
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}
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struct rmem_assigned_device {
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struct device *dev;
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struct reserved_mem *rmem;
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struct list_head list;
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};
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static LIST_HEAD(of_rmem_assigned_device_list);
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static DEFINE_MUTEX(of_rmem_assigned_device_mutex);
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/**
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* of_reserved_mem_device_init_by_idx() - assign reserved memory region to
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* given device
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* @dev: Pointer to the device to configure
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* @np: Pointer to the device_node with 'reserved-memory' property
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* @idx: Index of selected region
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*
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* This function assigns respective DMA-mapping operations based on reserved
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* memory region specified by 'memory-region' property in @np node to the @dev
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* device. When driver needs to use more than one reserved memory region, it
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* should allocate child devices and initialize regions by name for each of
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* child device.
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*
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* Returns error code or zero on success.
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*/
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int of_reserved_mem_device_init_by_idx(struct device *dev,
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struct device_node *np, int idx)
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{
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struct rmem_assigned_device *rd;
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struct device_node *target;
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struct reserved_mem *rmem;
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int ret;
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if (!np || !dev)
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return -EINVAL;
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target = of_parse_phandle(np, "memory-region", idx);
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if (!target)
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return -ENODEV;
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rmem = __find_rmem(target);
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of_node_put(target);
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if (!rmem || !rmem->ops || !rmem->ops->device_init)
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return -EINVAL;
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rd = kmalloc(sizeof(struct rmem_assigned_device), GFP_KERNEL);
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if (!rd)
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return -ENOMEM;
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ret = rmem->ops->device_init(rmem, dev);
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if (ret == 0) {
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rd->dev = dev;
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rd->rmem = rmem;
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mutex_lock(&of_rmem_assigned_device_mutex);
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list_add(&rd->list, &of_rmem_assigned_device_list);
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mutex_unlock(&of_rmem_assigned_device_mutex);
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/* ensure that dma_ops is set for virtual devices
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* using reserved memory
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*/
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of_dma_configure(dev, np, true);
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dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
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} else {
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kfree(rd);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(of_reserved_mem_device_init_by_idx);
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/**
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* of_reserved_mem_device_release() - release reserved memory device structures
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* @dev: Pointer to the device to deconfigure
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*
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* This function releases structures allocated for memory region handling for
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* the given device.
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*/
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void of_reserved_mem_device_release(struct device *dev)
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{
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struct rmem_assigned_device *rd;
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struct reserved_mem *rmem = NULL;
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mutex_lock(&of_rmem_assigned_device_mutex);
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list_for_each_entry(rd, &of_rmem_assigned_device_list, list) {
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if (rd->dev == dev) {
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rmem = rd->rmem;
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list_del(&rd->list);
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kfree(rd);
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break;
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}
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}
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mutex_unlock(&of_rmem_assigned_device_mutex);
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if (!rmem || !rmem->ops || !rmem->ops->device_release)
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return;
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rmem->ops->device_release(rmem, dev);
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}
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EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
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/**
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* of_reserved_mem_lookup() - acquire reserved_mem from a device node
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* @np: node pointer of the desired reserved-memory region
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*
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* This function allows drivers to acquire a reference to the reserved_mem
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* struct based on a device node handle.
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*
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* Returns a reserved_mem reference, or NULL on error.
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*/
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struct reserved_mem *of_reserved_mem_lookup(struct device_node *np)
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{
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const char *name;
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int i;
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if (!np->full_name)
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return NULL;
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name = kbasename(np->full_name);
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for (i = 0; i < reserved_mem_count; i++)
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if (!strcmp(reserved_mem[i].name, name))
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return &reserved_mem[i];
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return NULL;
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}
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EXPORT_SYMBOL_GPL(of_reserved_mem_lookup);
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