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Release 4.14 drivers/iommu/of_iommu.c

Directory: drivers/iommu
/*
 * OF helpers for IOMMU
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/export.h>
#include <linux/iommu.h>
#include <linux/limits.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
#include <linux/of_pci.h>
#include <linux/slab.h>


#define NO_IOMMU	1

static const struct of_device_id __iommu_of_table_sentinel
	__used __section(__iommu_of_table_end);

/**
 * of_get_dma_window - Parse *dma-window property and returns 0 if found.
 *
 * @dn: device node
 * @prefix: prefix for property name if any
 * @index: index to start to parse
 * @busno: Returns busno if supported. Otherwise pass NULL
 * @addr: Returns address that DMA starts
 * @size: Returns the range that DMA can handle
 *
 * This supports different formats flexibly. "prefix" can be
 * configured if any. "busno" and "index" are optionally
 * specified. Set 0(or NULL) if not used.
 */

int of_get_dma_window(struct device_node *dn, const char *prefix, int index, unsigned long *busno, dma_addr_t *addr, size_t *size) { const __be32 *dma_window, *end; int bytes, cur_index = 0; char propname[NAME_MAX], addrname[NAME_MAX], sizename[NAME_MAX]; if (!dn || !addr || !size) return -EINVAL; if (!prefix) prefix = ""; snprintf(propname, sizeof(propname), "%sdma-window", prefix); snprintf(addrname, sizeof(addrname), "%s#dma-address-cells", prefix); snprintf(sizename, sizeof(sizename), "%s#dma-size-cells", prefix); dma_window = of_get_property(dn, propname, &bytes); if (!dma_window) return -ENODEV; end = dma_window + bytes / sizeof(*dma_window); while (dma_window < end) { u32 cells; const void *prop; /* busno is one cell if supported */ if (busno) *busno = be32_to_cpup(dma_window++); prop = of_get_property(dn, addrname, NULL); if (!prop) prop = of_get_property(dn, "#address-cells", NULL); cells = prop ? be32_to_cpup(prop) : of_n_addr_cells(dn); if (!cells) return -EINVAL; *addr = of_read_number(dma_window, cells); dma_window += cells; prop = of_get_property(dn, sizename, NULL); cells = prop ? be32_to_cpup(prop) : of_n_size_cells(dn); if (!cells) return -EINVAL; *size = of_read_number(dma_window, cells); dma_window += cells; if (cur_index++ == index) break; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Hiroshi Doyu314100.00%1100.00%
Total314100.00%1100.00%

EXPORT_SYMBOL_GPL(of_get_dma_window);
static bool of_iommu_driver_present(struct device_node *np) { /* * If the IOMMU still isn't ready by the time we reach init, assume * it never will be. We don't want to defer indefinitely, nor attempt * to dereference __iommu_of_table after it's been freed. */ if (system_state >= SYSTEM_RUNNING) return false; return of_match_node(&__iommu_of_table, np); }

Contributors

PersonTokensPropCommitsCommitProp
Robin Murphy2893.33%150.00%
Thomas Gleixner26.67%150.00%
Total30100.00%2100.00%


static int of_iommu_xlate(struct device *dev, struct of_phandle_args *iommu_spec) { const struct iommu_ops *ops; struct fwnode_handle *fwnode = &iommu_spec->np->fwnode; int err; ops = iommu_ops_from_fwnode(fwnode); if ((ops && !ops->of_xlate) || !of_device_is_available(iommu_spec->np) || (!ops && !of_iommu_driver_present(iommu_spec->np))) return NO_IOMMU; err = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops); if (err) return err; /* * The otherwise-empty fwspec handily serves to indicate the specific * IOMMU device we're waiting for, which will be useful if we ever get * a proper probe-ordering dependency mechanism in future. */ if (!ops) return -EPROBE_DEFER; return ops->of_xlate(dev, iommu_spec); }

Contributors

PersonTokensPropCommitsCommitProp
Robin Murphy11493.44%375.00%
R Sricharan86.56%125.00%
Total122100.00%4100.00%

struct of_pci_iommu_alias_info { struct device *dev; struct device_node *np; };
static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) { struct of_pci_iommu_alias_info *info = data; struct of_phandle_args iommu_spec = { .args_count = 1 }; int err; err = of_pci_map_rid(info->np, alias, "iommu-map", "iommu-map-mask", &iommu_spec.np, iommu_spec.args); if (err) return err == -ENODEV ? NO_IOMMU : err; err = of_iommu_xlate(info->dev, &iommu_spec); of_node_put(iommu_spec.np); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Robin Murphy99100.00%4100.00%
Total99100.00%4100.00%


const struct iommu_ops *of_iommu_configure(struct device *dev, struct device_node *master_np) { const struct iommu_ops *ops = NULL; struct iommu_fwspec *fwspec = dev->iommu_fwspec; int err = NO_IOMMU; if (!master_np) return NULL; if (fwspec) { if (fwspec->ops) return fwspec->ops; /* In the deferred case, start again from scratch */ iommu_fwspec_free(dev); } /* * We don't currently walk up the tree looking for a parent IOMMU. * See the `Notes:' section of * Documentation/devicetree/bindings/iommu/iommu.txt */ if (dev_is_pci(dev)) { struct of_pci_iommu_alias_info info = { .dev = dev, .np = master_np, }; err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); } else { struct of_phandle_args iommu_spec; int idx = 0; while (!of_parse_phandle_with_args(master_np, "iommus", "#iommu-cells", idx, &iommu_spec)) { err = of_iommu_xlate(dev, &iommu_spec); of_node_put(iommu_spec.np); idx++; if (err) break; } } /* * Two success conditions can be represented by non-negative err here: * >0 : there is no IOMMU, or one was unavailable for non-fatal reasons * 0 : we found an IOMMU, and dev->fwspec is initialised appropriately * <0 : any actual error */ if (!err) ops = dev->iommu_fwspec->ops; /* * If we have reason to believe the IOMMU driver missed the initial * add_device callback for dev, replay it to get things in order. */ if (ops && ops->add_device && dev->bus && !dev->iommu_group) err = ops->add_device(dev); /* Ignore all other errors apart from EPROBE_DEFER */ if (err == -EPROBE_DEFER) { ops = ERR_PTR(err); } else if (err < 0) { dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); ops = NULL; } return ops; }

Contributors

PersonTokensPropCommitsCommitProp
Robin Murphy22489.24%466.67%
R Sricharan166.37%116.67%
Will Deacon114.38%116.67%
Total251100.00%6100.00%


static int __init of_iommu_init(void) { struct device_node *np; const struct of_device_id *match, *matches = &__iommu_of_table; for_each_matching_node_and_match(np, matches, &match) { const of_iommu_init_fn init_fn = match->data; if (init_fn && init_fn(np)) pr_err("Failed to initialise IOMMU %pOF\n", np); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Will Deacon5587.30%125.00%
Kefeng Wang57.94%125.00%
Laurent Pinchart23.17%125.00%
Rob Herring11.59%125.00%
Total63100.00%4100.00%

postcore_initcall_sync(of_iommu_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Robin Murphy49052.02%637.50%
Hiroshi Doyu33035.03%16.25%
Will Deacon808.49%212.50%
R Sricharan242.55%212.50%
Kefeng Wang101.06%16.25%
Brian Norris30.32%16.25%
Thomas Gleixner20.21%16.25%
Laurent Pinchart20.21%16.25%
Rob Herring10.11%16.25%
Total942100.00%16100.00%
Directory: drivers/iommu
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