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5f937bc48a
We no longer have a notion of partially-initialised fwspecs existing, and we also no longer need to use an iommu_ops pointer to return status to of_dma_configure(). Clean up the remains of those, which lends itself to clarifying the logic around the dma_range_map allocation as well. Acked-by: Rob Herring (Arm) <robh@kernel.org> Tested-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/61972f88e31a6eda8bf5852f0853951164279a3c.1719919669.git.robin.murphy@arm.com Signed-off-by: Will Deacon <will@kernel.org>
320 lines
8.8 KiB
C
320 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/of_iommu.h>
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#include <linux/of_reserved_mem.h>
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#include <linux/dma-direct.h> /* for bus_dma_region */
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#include <linux/dma-map-ops.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <asm/errno.h>
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#include "of_private.h"
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/**
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* of_match_device - Tell if a struct device matches an of_device_id list
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* @matches: array of of device match structures to search in
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* @dev: the of device structure to match against
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*
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* Used by a driver to check whether an platform_device present in the
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* system is in its list of supported devices.
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*/
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const struct of_device_id *of_match_device(const struct of_device_id *matches,
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const struct device *dev)
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{
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if (!matches || !dev->of_node || dev->of_node_reused)
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return NULL;
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return of_match_node(matches, dev->of_node);
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}
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EXPORT_SYMBOL(of_match_device);
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static void
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of_dma_set_restricted_buffer(struct device *dev, struct device_node *np)
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{
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struct device_node *node, *of_node = dev->of_node;
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int count, i;
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if (!IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL))
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return;
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count = of_property_count_elems_of_size(of_node, "memory-region",
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sizeof(u32));
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/*
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* If dev->of_node doesn't exist or doesn't contain memory-region, try
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* the OF node having DMA configuration.
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*/
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if (count <= 0) {
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of_node = np;
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count = of_property_count_elems_of_size(
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of_node, "memory-region", sizeof(u32));
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}
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for (i = 0; i < count; i++) {
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node = of_parse_phandle(of_node, "memory-region", i);
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/*
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* There might be multiple memory regions, but only one
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* restricted-dma-pool region is allowed.
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*/
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if (of_device_is_compatible(node, "restricted-dma-pool") &&
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of_device_is_available(node)) {
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of_node_put(node);
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break;
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}
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of_node_put(node);
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}
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/*
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* Attempt to initialize a restricted-dma-pool region if one was found.
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* Note that count can hold a negative error code.
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*/
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if (i < count && of_reserved_mem_device_init_by_idx(dev, of_node, i))
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dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n");
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}
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/**
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* of_dma_configure_id - Setup DMA configuration
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* @dev: Device to apply DMA configuration
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* @np: Pointer to OF node having DMA configuration
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* @force_dma: Whether device is to be set up by of_dma_configure() even if
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* DMA capability is not explicitly described by firmware.
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* @id: Optional const pointer value input id
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*
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* Try to get devices's DMA configuration from DT and update it
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* accordingly.
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*
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* If platform code needs to use its own special DMA configuration, it
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* can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
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* to fix up DMA configuration.
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*/
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int of_dma_configure_id(struct device *dev, struct device_node *np,
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bool force_dma, const u32 *id)
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{
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const struct bus_dma_region *map = NULL;
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struct device_node *bus_np;
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u64 mask, end = 0;
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bool coherent, set_map = false;
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int ret;
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if (np == dev->of_node)
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bus_np = __of_get_dma_parent(np);
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else
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bus_np = of_node_get(np);
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ret = of_dma_get_range(bus_np, &map);
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of_node_put(bus_np);
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if (ret < 0) {
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/*
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* For legacy reasons, we have to assume some devices need
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* DMA configuration regardless of whether "dma-ranges" is
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* correctly specified or not.
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*/
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if (!force_dma)
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return ret == -ENODEV ? 0 : ret;
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} else {
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/* Determine the overall bounds of all DMA regions */
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end = dma_range_map_max(map);
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set_map = true;
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}
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/*
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* If @dev is expected to be DMA-capable then the bus code that created
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* it should have initialised its dma_mask pointer by this point. For
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* now, we'll continue the legacy behaviour of coercing it to the
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* coherent mask if not, but we'll no longer do so quietly.
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*/
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if (!dev->dma_mask) {
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dev_warn(dev, "DMA mask not set\n");
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dev->dma_mask = &dev->coherent_dma_mask;
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}
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if (!end && dev->coherent_dma_mask)
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end = dev->coherent_dma_mask;
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else if (!end)
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end = (1ULL << 32) - 1;
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/*
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* Limit coherent and dma mask based on size and default mask
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* set by the driver.
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*/
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mask = DMA_BIT_MASK(ilog2(end) + 1);
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dev->coherent_dma_mask &= mask;
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*dev->dma_mask &= mask;
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/* ...but only set bus limit and range map if we found valid dma-ranges earlier */
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if (set_map) {
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dev->bus_dma_limit = end;
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dev->dma_range_map = map;
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}
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coherent = of_dma_is_coherent(np);
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dev_dbg(dev, "device is%sdma coherent\n",
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coherent ? " " : " not ");
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ret = of_iommu_configure(dev, np, id);
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if (ret == -EPROBE_DEFER) {
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/* Don't touch range map if it wasn't set from a valid dma-ranges */
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if (set_map)
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dev->dma_range_map = NULL;
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kfree(map);
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return -EPROBE_DEFER;
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}
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/* Take all other IOMMU errors to mean we'll just carry on without it */
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dev_dbg(dev, "device is%sbehind an iommu\n",
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!ret ? " " : " not ");
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arch_setup_dma_ops(dev, coherent);
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if (ret)
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of_dma_set_restricted_buffer(dev, np);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_dma_configure_id);
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const void *of_device_get_match_data(const struct device *dev)
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{
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const struct of_device_id *match;
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match = of_match_device(dev->driver->of_match_table, dev);
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if (!match)
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return NULL;
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return match->data;
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}
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EXPORT_SYMBOL(of_device_get_match_data);
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/**
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* of_device_modalias - Fill buffer with newline terminated modalias string
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* @dev: Calling device
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* @str: Modalias string
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* @len: Size of @str
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*/
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ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
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{
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ssize_t sl;
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if (!dev || !dev->of_node || dev->of_node_reused)
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return -ENODEV;
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sl = of_modalias(dev->of_node, str, len - 2);
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if (sl < 0)
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return sl;
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if (sl > len - 2)
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return -ENOMEM;
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str[sl++] = '\n';
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str[sl] = 0;
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return sl;
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}
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EXPORT_SYMBOL_GPL(of_device_modalias);
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/**
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* of_device_uevent - Display OF related uevent information
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* @dev: Device to display the uevent information for
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* @env: Kernel object's userspace event reference to fill up
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*/
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void of_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
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{
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const char *compat, *type;
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struct alias_prop *app;
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struct property *p;
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int seen = 0;
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if ((!dev) || (!dev->of_node))
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return;
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add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node);
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add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
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type = of_node_get_device_type(dev->of_node);
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if (type)
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add_uevent_var(env, "OF_TYPE=%s", type);
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/* Since the compatible field can contain pretty much anything
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* it's not really legal to split it out with commas. We split it
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* up using a number of environment variables instead. */
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of_property_for_each_string(dev->of_node, "compatible", p, compat) {
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add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
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seen++;
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}
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add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
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seen = 0;
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mutex_lock(&of_mutex);
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list_for_each_entry(app, &aliases_lookup, link) {
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if (dev->of_node == app->np) {
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add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
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app->alias);
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seen++;
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}
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}
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mutex_unlock(&of_mutex);
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}
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EXPORT_SYMBOL_GPL(of_device_uevent);
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int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env)
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{
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int sl;
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if ((!dev) || (!dev->of_node) || dev->of_node_reused)
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return -ENODEV;
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/* Devicetree modalias is tricky, we add it in 2 steps */
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if (add_uevent_var(env, "MODALIAS="))
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return -ENOMEM;
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sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],
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sizeof(env->buf) - env->buflen);
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if (sl < 0)
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return sl;
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if (sl >= (sizeof(env->buf) - env->buflen))
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return -ENOMEM;
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env->buflen += sl;
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
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/**
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* of_device_make_bus_id - Use the device node data to assign a unique name
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* @dev: pointer to device structure that is linked to a device tree node
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*
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* This routine will first try using the translated bus address to
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* derive a unique name. If it cannot, then it will prepend names from
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* parent nodes until a unique name can be derived.
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*/
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void of_device_make_bus_id(struct device *dev)
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{
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struct device_node *node = dev->of_node;
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const __be32 *reg;
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u64 addr;
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u32 mask;
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/* Construct the name, using parent nodes if necessary to ensure uniqueness */
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while (node->parent) {
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/*
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* If the address can be translated, then that is as much
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* uniqueness as we need. Make it the first component and return
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*/
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reg = of_get_property(node, "reg", NULL);
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if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
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if (!of_property_read_u32(node, "mask", &mask))
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dev_set_name(dev, dev_name(dev) ? "%llx.%x.%pOFn:%s" : "%llx.%x.%pOFn",
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addr, ffs(mask) - 1, node, dev_name(dev));
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else
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dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn",
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addr, node, dev_name(dev));
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return;
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}
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/* format arguments only used if dev_name() resolves to NULL */
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dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
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kbasename(node->full_name), dev_name(dev));
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node = node->parent;
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}
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}
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EXPORT_SYMBOL_GPL(of_device_make_bus_id);
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