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apple-dart.c
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apple-dart.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Apple DART (Device Address Resolution Table) IOMMU driver
*
* Copyright (C) 2021 The Asahi Linux Contributors
*
* Based on arm/arm-smmu/arm-ssmu.c and arm/arm-smmu-v3/arm-smmu-v3.c
* Copyright (C) 2013 ARM Limited
* Copyright (C) 2015 ARM Limited
* and on exynos-iommu.c
* Copyright (c) 2011,2016 Samsung Electronics Co., Ltd.
*/
#include <linux/atomic.h>
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/dev_printk.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io-pgtable.h>
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_iommu.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/swab.h>
#include <linux/types.h>
#include "dma-iommu.h"
#define DART_MAX_STREAMS 256
#define DART_MAX_TTBR 4
#define MAX_DARTS_PER_DEVICE 2
/* Common registers */
#define DART_PARAMS1 0x00
#define DART_PARAMS1_PAGE_SHIFT GENMASK(27, 24)
#define DART_PARAMS2 0x04
#define DART_PARAMS2_BYPASS_SUPPORT BIT(0)
/* T8020/T6000 registers */
#define DART_T8020_STREAM_COMMAND 0x20
#define DART_T8020_STREAM_COMMAND_BUSY BIT(2)
#define DART_T8020_STREAM_COMMAND_INVALIDATE BIT(20)
#define DART_T8020_STREAM_SELECT 0x34
#define DART_T8020_ERROR 0x40
#define DART_T8020_ERROR_STREAM GENMASK(27, 24)
#define DART_T8020_ERROR_CODE GENMASK(11, 0)
#define DART_T8020_ERROR_FLAG BIT(31)
#define DART_T8020_ERROR_READ_FAULT BIT(4)
#define DART_T8020_ERROR_WRITE_FAULT BIT(3)
#define DART_T8020_ERROR_NO_PTE BIT(2)
#define DART_T8020_ERROR_NO_PMD BIT(1)
#define DART_T8020_ERROR_NO_TTBR BIT(0)
#define DART_T8020_CONFIG 0x60
#define DART_T8020_CONFIG_LOCK BIT(15)
#define DART_STREAM_COMMAND_BUSY_TIMEOUT 100
#define DART_T8020_ERROR_ADDR_HI 0x54
#define DART_T8020_ERROR_ADDR_LO 0x50
#define DART_T8020_STREAMS_ENABLE 0xfc
#define DART_T8020_TCR 0x100
#define DART_T8020_TCR_TRANSLATE_ENABLE BIT(7)
#define DART_T8020_TCR_BYPASS_DART BIT(8)
#define DART_T8020_TCR_BYPASS_DAPF BIT(12)
#define DART_T8020_TTBR 0x200
#define DART_T8020_USB4_TTBR 0x400
#define DART_T8020_TTBR_VALID BIT(31)
#define DART_T8020_TTBR_ADDR_FIELD_SHIFT 0
#define DART_T8020_TTBR_SHIFT 12
/* T8110 registers */
#define DART_T8110_PARAMS3 0x08
#define DART_T8110_PARAMS3_PA_WIDTH GENMASK(29, 24)
#define DART_T8110_PARAMS3_VA_WIDTH GENMASK(21, 16)
#define DART_T8110_PARAMS3_VER_MAJ GENMASK(15, 8)
#define DART_T8110_PARAMS3_VER_MIN GENMASK(7, 0)
#define DART_T8110_PARAMS4 0x0c
#define DART_T8110_PARAMS4_NUM_CLIENTS GENMASK(24, 16)
#define DART_T8110_PARAMS4_NUM_SIDS GENMASK(8, 0)
#define DART_T8110_TLB_CMD 0x80
#define DART_T8110_TLB_CMD_BUSY BIT(31)
#define DART_T8110_TLB_CMD_OP GENMASK(10, 8)
#define DART_T8110_TLB_CMD_OP_FLUSH_ALL 0
#define DART_T8110_TLB_CMD_OP_FLUSH_SID 1
#define DART_T8110_TLB_CMD_STREAM GENMASK(7, 0)
#define DART_T8110_ERROR 0x100
#define DART_T8110_ERROR_STREAM GENMASK(27, 20)
#define DART_T8110_ERROR_CODE GENMASK(14, 0)
#define DART_T8110_ERROR_FLAG BIT(31)
#define DART_T8110_ERROR_MASK 0x104
#define DART_T8110_ERROR_READ_FAULT BIT(5)
#define DART_T8110_ERROR_WRITE_FAULT BIT(4)
#define DART_T8110_ERROR_NO_PTE BIT(3)
#define DART_T8110_ERROR_NO_PMD BIT(2)
#define DART_T8110_ERROR_NO_PGD BIT(1)
#define DART_T8110_ERROR_NO_TTBR BIT(0)
#define DART_T8110_ERROR_ADDR_LO 0x170
#define DART_T8110_ERROR_ADDR_HI 0x174
#define DART_T8110_PROTECT 0x200
#define DART_T8110_UNPROTECT 0x204
#define DART_T8110_PROTECT_LOCK 0x208
#define DART_T8110_PROTECT_TTBR_TCR BIT(0)
#define DART_T8110_ENABLE_STREAMS 0xc00
#define DART_T8110_DISABLE_STREAMS 0xc20
#define DART_T8110_TCR 0x1000
#define DART_T8110_TCR_REMAP GENMASK(11, 8)
#define DART_T8110_TCR_REMAP_EN BIT(7)
#define DART_T8110_TCR_BYPASS_DAPF BIT(2)
#define DART_T8110_TCR_BYPASS_DART BIT(1)
#define DART_T8110_TCR_TRANSLATE_ENABLE BIT(0)
#define DART_T8110_TTBR 0x1400
#define DART_T8110_TTBR_VALID BIT(0)
#define DART_T8110_TTBR_ADDR_FIELD_SHIFT 2
#define DART_T8110_TTBR_SHIFT 14
#define DART_TCR(dart, sid) ((dart)->hw->tcr + ((sid) << 2))
#define DART_TTBR(dart, sid, idx) ((dart)->hw->ttbr + \
(((dart)->hw->ttbr_count * (sid)) << 2) + \
((idx) << 2))
struct apple_dart_stream_map;
enum dart_type {
DART_T8020,
DART_T6000,
DART_T8110,
};
struct apple_dart_hw {
enum dart_type type;
irqreturn_t (*irq_handler)(int irq, void *dev);
int (*invalidate_tlb)(struct apple_dart_stream_map *stream_map);
u32 oas;
enum io_pgtable_fmt fmt;
int max_sid_count;
u64 lock;
u64 lock_bit;
u64 error;
u64 enable_streams;
u64 tcr;
u64 tcr_enabled;
u64 tcr_disabled;
u64 tcr_bypass;
u64 ttbr;
u64 ttbr_valid;
u64 ttbr_addr_field_shift;
u64 ttbr_shift;
int ttbr_count;
};
/*
* Private structure associated with each DART device.
*
* @dev: device struct
* @hw: SoC-specific hardware data
* @regs: mapped MMIO region
* @irq: interrupt number, can be shared with other DARTs
* @clks: clocks associated with this DART
* @num_clks: number of @clks
* @lock: lock for hardware operations involving this dart
* @pgsize: pagesize supported by this DART
* @supports_bypass: indicates if this DART supports bypass mode
* @sid2group: maps stream ids to iommu_groups
* @iommu: iommu core device
*/
struct apple_dart {
struct device *dev;
const struct apple_dart_hw *hw;
void __iomem *regs;
int irq;
struct clk_bulk_data *clks;
int num_clks;
spinlock_t lock;
u32 ias;
u32 oas;
u32 pgsize;
u32 num_streams;
u32 supports_bypass : 1;
struct iommu_group *sid2group[DART_MAX_STREAMS];
struct iommu_device iommu;
u32 save_tcr[DART_MAX_STREAMS];
u32 save_ttbr[DART_MAX_STREAMS][DART_MAX_TTBR];
};
/*
* Convenience struct to identify streams.
*
* The normal variant is used inside apple_dart_master_cfg which isn't written
* to concurrently.
* The atomic variant is used inside apple_dart_domain where we have to guard
* against races from potential parallel calls to attach/detach_device.
* Note that even inside the atomic variant the apple_dart pointer is not
* protected: This pointer is initialized once under the domain init mutex
* and never changed again afterwards. Devices with different dart pointers
* cannot be attached to the same domain.
*
* @dart dart pointer
* @sid stream id bitmap
*/
struct apple_dart_stream_map {
struct apple_dart *dart;
DECLARE_BITMAP(sidmap, DART_MAX_STREAMS);
};
struct apple_dart_atomic_stream_map {
struct apple_dart *dart;
atomic_long_t sidmap[BITS_TO_LONGS(DART_MAX_STREAMS)];
};
/*
* This structure is attached to each iommu domain handled by a DART.
*
* @pgtbl_ops: pagetable ops allocated by io-pgtable
* @finalized: true if the domain has been completely initialized
* @init_lock: protects domain initialization
* @stream_maps: streams attached to this domain (valid for DMA/UNMANAGED only)
* @domain: core iommu domain pointer
*/
struct apple_dart_domain {
struct io_pgtable_ops *pgtbl_ops;
bool finalized;
struct mutex init_lock;
struct apple_dart_atomic_stream_map stream_maps[MAX_DARTS_PER_DEVICE];
struct iommu_domain domain;
};
/*
* This structure is attached to devices with dev_iommu_priv_set() on of_xlate
* and contains a list of streams bound to this device.
* So far the worst case seen is a single device with two streams
* from different darts, such that this simple static array is enough.
*
* @streams: streams for this device
*/
struct apple_dart_master_cfg {
struct apple_dart_stream_map stream_maps[MAX_DARTS_PER_DEVICE];
};
/*
* Helper macro to iterate over apple_dart_master_cfg.stream_maps and
* apple_dart_domain.stream_maps
*
* @i int used as loop variable
* @base pointer to base struct (apple_dart_master_cfg or apple_dart_domain)
* @stream pointer to the apple_dart_streams struct for each loop iteration
*/
#define for_each_stream_map(i, base, stream_map) \
for (i = 0, stream_map = &(base)->stream_maps[0]; \
i < MAX_DARTS_PER_DEVICE && stream_map->dart; \
stream_map = &(base)->stream_maps[++i])
static struct platform_driver apple_dart_driver;
static const struct iommu_ops apple_dart_iommu_ops;
static struct apple_dart_domain *to_dart_domain(struct iommu_domain *dom)
{
return container_of(dom, struct apple_dart_domain, domain);
}
static void
apple_dart_hw_enable_translation(struct apple_dart_stream_map *stream_map)
{
struct apple_dart *dart = stream_map->dart;
int sid;
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->tcr_enabled, dart->regs + DART_TCR(dart, sid));
}
static void apple_dart_hw_disable_dma(struct apple_dart_stream_map *stream_map)
{
struct apple_dart *dart = stream_map->dart;
int sid;
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->tcr_disabled, dart->regs + DART_TCR(dart, sid));
}
static void
apple_dart_hw_enable_bypass(struct apple_dart_stream_map *stream_map)
{
struct apple_dart *dart = stream_map->dart;
int sid;
WARN_ON(!stream_map->dart->supports_bypass);
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->tcr_bypass,
dart->regs + DART_TCR(dart, sid));
}
static void apple_dart_hw_set_ttbr(struct apple_dart_stream_map *stream_map,
u8 idx, phys_addr_t paddr)
{
struct apple_dart *dart = stream_map->dart;
int sid;
WARN_ON(paddr & ((1 << dart->hw->ttbr_shift) - 1));
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->ttbr_valid |
(paddr >> dart->hw->ttbr_shift) << dart->hw->ttbr_addr_field_shift,
dart->regs + DART_TTBR(dart, sid, idx));
}
static void apple_dart_hw_clear_ttbr(struct apple_dart_stream_map *stream_map,
u8 idx)
{
struct apple_dart *dart = stream_map->dart;
int sid;
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(0, dart->regs + DART_TTBR(dart, sid, idx));
}
static void
apple_dart_hw_clear_all_ttbrs(struct apple_dart_stream_map *stream_map)
{
int i;
for (i = 0; i < stream_map->dart->hw->ttbr_count; ++i)
apple_dart_hw_clear_ttbr(stream_map, i);
}
static int
apple_dart_t8020_hw_stream_command(struct apple_dart_stream_map *stream_map,
u32 command)
{
unsigned long flags;
int ret, i;
u32 command_reg;
spin_lock_irqsave(&stream_map->dart->lock, flags);
for (i = 0; i < BITS_TO_U32(stream_map->dart->num_streams); i++)
writel(stream_map->sidmap[i],
stream_map->dart->regs + DART_T8020_STREAM_SELECT + 4 * i);
writel(command, stream_map->dart->regs + DART_T8020_STREAM_COMMAND);
ret = readl_poll_timeout_atomic(
stream_map->dart->regs + DART_T8020_STREAM_COMMAND, command_reg,
!(command_reg & DART_T8020_STREAM_COMMAND_BUSY), 1,
DART_STREAM_COMMAND_BUSY_TIMEOUT);
spin_unlock_irqrestore(&stream_map->dart->lock, flags);
if (ret) {
dev_err(stream_map->dart->dev,
"busy bit did not clear after command %x for streams %lx\n",
command, stream_map->sidmap[0]);
return ret;
}
return 0;
}
static int
apple_dart_t8110_hw_tlb_command(struct apple_dart_stream_map *stream_map,
u32 command)
{
struct apple_dart *dart = stream_map->dart;
unsigned long flags;
int ret = 0;
int sid;
spin_lock_irqsave(&dart->lock, flags);
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams) {
u32 val = FIELD_PREP(DART_T8110_TLB_CMD_OP, command) |
FIELD_PREP(DART_T8110_TLB_CMD_STREAM, sid);
writel(val, dart->regs + DART_T8110_TLB_CMD);
ret = readl_poll_timeout_atomic(
dart->regs + DART_T8110_TLB_CMD, val,
!(val & DART_T8110_TLB_CMD_BUSY), 1,
DART_STREAM_COMMAND_BUSY_TIMEOUT);
if (ret)
break;
}
spin_unlock_irqrestore(&dart->lock, flags);
if (ret) {
dev_err(stream_map->dart->dev,
"busy bit did not clear after command %x for stream %d\n",
command, sid);
return ret;
}
return 0;
}
static int
apple_dart_t8020_hw_invalidate_tlb(struct apple_dart_stream_map *stream_map)
{
return apple_dart_t8020_hw_stream_command(
stream_map, DART_T8020_STREAM_COMMAND_INVALIDATE);
}
static int
apple_dart_t8110_hw_invalidate_tlb(struct apple_dart_stream_map *stream_map)
{
return apple_dart_t8110_hw_tlb_command(
stream_map, DART_T8110_TLB_CMD_OP_FLUSH_SID);
}
static int apple_dart_hw_reset(struct apple_dart *dart)
{
u32 config;
struct apple_dart_stream_map stream_map;
int i;
config = readl(dart->regs + dart->hw->lock);
if (config & dart->hw->lock_bit) {
dev_err(dart->dev, "DART is locked down until reboot: %08x\n",
config);
return -EINVAL;
}
stream_map.dart = dart;
bitmap_zero(stream_map.sidmap, DART_MAX_STREAMS);
bitmap_set(stream_map.sidmap, 0, dart->num_streams);
apple_dart_hw_disable_dma(&stream_map);
apple_dart_hw_clear_all_ttbrs(&stream_map);
/* enable all streams globally since TCR is used to control isolation */
for (i = 0; i < BITS_TO_U32(dart->num_streams); i++)
writel(U32_MAX, dart->regs + dart->hw->enable_streams + 4 * i);
/* clear any pending errors before the interrupt is unmasked */
writel(readl(dart->regs + dart->hw->error), dart->regs + dart->hw->error);
if (dart->hw->type == DART_T8110)
writel(0, dart->regs + DART_T8110_ERROR_MASK);
return dart->hw->invalidate_tlb(&stream_map);
}
static void apple_dart_domain_flush_tlb(struct apple_dart_domain *domain)
{
int i, j;
struct apple_dart_atomic_stream_map *domain_stream_map;
struct apple_dart_stream_map stream_map;
for_each_stream_map(i, domain, domain_stream_map) {
stream_map.dart = domain_stream_map->dart;
for (j = 0; j < BITS_TO_LONGS(stream_map.dart->num_streams); j++)
stream_map.sidmap[j] = atomic_long_read(&domain_stream_map->sidmap[j]);
stream_map.dart->hw->invalidate_tlb(&stream_map);
}
}
static void apple_dart_flush_iotlb_all(struct iommu_domain *domain)
{
apple_dart_domain_flush_tlb(to_dart_domain(domain));
}
static void apple_dart_iotlb_sync(struct iommu_domain *domain,
struct iommu_iotlb_gather *gather)
{
apple_dart_domain_flush_tlb(to_dart_domain(domain));
}
static int apple_dart_iotlb_sync_map(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
apple_dart_domain_flush_tlb(to_dart_domain(domain));
return 0;
}
static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
struct io_pgtable_ops *ops = dart_domain->pgtbl_ops;
if (!ops)
return 0;
return ops->iova_to_phys(ops, iova);
}
static int apple_dart_map_pages(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t pgsize,
size_t pgcount, int prot, gfp_t gfp,
size_t *mapped)
{
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
struct io_pgtable_ops *ops = dart_domain->pgtbl_ops;
if (!ops)
return -ENODEV;
return ops->map_pages(ops, iova, paddr, pgsize, pgcount, prot, gfp,
mapped);
}
static size_t apple_dart_unmap_pages(struct iommu_domain *domain,
unsigned long iova, size_t pgsize,
size_t pgcount,
struct iommu_iotlb_gather *gather)
{
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
struct io_pgtable_ops *ops = dart_domain->pgtbl_ops;
return ops->unmap_pages(ops, iova, pgsize, pgcount, gather);
}
static void
apple_dart_setup_translation(struct apple_dart_domain *domain,
struct apple_dart_stream_map *stream_map)
{
int i;
struct io_pgtable_cfg *pgtbl_cfg =
&io_pgtable_ops_to_pgtable(domain->pgtbl_ops)->cfg;
for (i = 0; i < pgtbl_cfg->apple_dart_cfg.n_ttbrs; ++i)
apple_dart_hw_set_ttbr(stream_map, i,
pgtbl_cfg->apple_dart_cfg.ttbr[i]);
for (; i < stream_map->dart->hw->ttbr_count; ++i)
apple_dart_hw_clear_ttbr(stream_map, i);
apple_dart_hw_enable_translation(stream_map);
stream_map->dart->hw->invalidate_tlb(stream_map);
}
static int apple_dart_finalize_domain(struct apple_dart_domain *dart_domain,
struct apple_dart_master_cfg *cfg)
{
struct apple_dart *dart = cfg->stream_maps[0].dart;
struct io_pgtable_cfg pgtbl_cfg;
int ret = 0;
int i, j;
if (dart->pgsize > PAGE_SIZE)
return -EINVAL;
mutex_lock(&dart_domain->init_lock);
if (dart_domain->finalized)
goto done;
for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
dart_domain->stream_maps[i].dart = cfg->stream_maps[i].dart;
for (j = 0; j < BITS_TO_LONGS(dart->num_streams); j++)
atomic_long_set(&dart_domain->stream_maps[i].sidmap[j],
cfg->stream_maps[i].sidmap[j]);
}
pgtbl_cfg = (struct io_pgtable_cfg){
.pgsize_bitmap = dart->pgsize,
.ias = dart->ias,
.oas = dart->oas,
.coherent_walk = 1,
.iommu_dev = dart->dev,
};
dart_domain->pgtbl_ops = alloc_io_pgtable_ops(dart->hw->fmt, &pgtbl_cfg,
&dart_domain->domain);
if (!dart_domain->pgtbl_ops) {
ret = -ENOMEM;
goto done;
}
dart_domain->domain.pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
dart_domain->domain.geometry.aperture_start = 0;
dart_domain->domain.geometry.aperture_end =
(dma_addr_t)DMA_BIT_MASK(dart->ias);
dart_domain->domain.geometry.force_aperture = true;
dart_domain->finalized = true;
done:
mutex_unlock(&dart_domain->init_lock);
return ret;
}
static int
apple_dart_mod_streams(struct apple_dart_atomic_stream_map *domain_maps,
struct apple_dart_stream_map *master_maps,
bool add_streams)
{
int i, j;
for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
if (domain_maps[i].dart != master_maps[i].dart)
return -EINVAL;
}
for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
if (!domain_maps[i].dart)
break;
for (j = 0; j < BITS_TO_LONGS(domain_maps[i].dart->num_streams); j++) {
if (add_streams)
atomic_long_or(master_maps[i].sidmap[j],
&domain_maps[i].sidmap[j]);
else
atomic_long_and(~master_maps[i].sidmap[j],
&domain_maps[i].sidmap[j]);
}
}
return 0;
}
static int apple_dart_domain_add_streams(struct apple_dart_domain *domain,
struct apple_dart_master_cfg *cfg)
{
return apple_dart_mod_streams(domain->stream_maps, cfg->stream_maps,
true);
}
static int apple_dart_attach_dev_paging(struct iommu_domain *domain,
struct device *dev)
{
int ret, i;
struct apple_dart_stream_map *stream_map;
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
ret = apple_dart_finalize_domain(dart_domain, cfg);
if (ret)
return ret;
ret = apple_dart_domain_add_streams(dart_domain, cfg);
if (ret)
return ret;
for_each_stream_map(i, cfg, stream_map)
apple_dart_setup_translation(dart_domain, stream_map);
return 0;
}
static int apple_dart_attach_dev_identity(struct iommu_domain *domain,
struct device *dev)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct apple_dart_stream_map *stream_map;
int i;
if (!cfg->stream_maps[0].dart->supports_bypass)
return -EINVAL;
for_each_stream_map(i, cfg, stream_map)
apple_dart_hw_enable_bypass(stream_map);
return 0;
}
static const struct iommu_domain_ops apple_dart_identity_ops = {
.attach_dev = apple_dart_attach_dev_identity,
};
static struct iommu_domain apple_dart_identity_domain = {
.type = IOMMU_DOMAIN_IDENTITY,
.ops = &apple_dart_identity_ops,
};
static int apple_dart_attach_dev_blocked(struct iommu_domain *domain,
struct device *dev)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct apple_dart_stream_map *stream_map;
int i;
for_each_stream_map(i, cfg, stream_map)
apple_dart_hw_disable_dma(stream_map);
return 0;
}
static const struct iommu_domain_ops apple_dart_blocked_ops = {
.attach_dev = apple_dart_attach_dev_blocked,
};
static struct iommu_domain apple_dart_blocked_domain = {
.type = IOMMU_DOMAIN_BLOCKED,
.ops = &apple_dart_blocked_ops,
};
static struct iommu_device *apple_dart_probe_device(struct device *dev)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct apple_dart_stream_map *stream_map;
int i;
if (!cfg)
return ERR_PTR(-ENODEV);
for_each_stream_map(i, cfg, stream_map)
device_link_add(
dev, stream_map->dart->dev,
DL_FLAG_PM_RUNTIME | DL_FLAG_AUTOREMOVE_SUPPLIER);
return &cfg->stream_maps[0].dart->iommu;
}
static void apple_dart_release_device(struct device *dev)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
kfree(cfg);
}
static struct iommu_domain *apple_dart_domain_alloc_paging(struct device *dev)
{
struct apple_dart_domain *dart_domain;
dart_domain = kzalloc(sizeof(*dart_domain), GFP_KERNEL);
if (!dart_domain)
return NULL;
mutex_init(&dart_domain->init_lock);
if (dev) {
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
int ret;
ret = apple_dart_finalize_domain(dart_domain, cfg);
if (ret) {
kfree(dart_domain);
return ERR_PTR(ret);
}
}
return &dart_domain->domain;
}
static void apple_dart_domain_free(struct iommu_domain *domain)
{
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
if (dart_domain->pgtbl_ops)
free_io_pgtable_ops(dart_domain->pgtbl_ops);
kfree(dart_domain);
}
static int apple_dart_of_xlate(struct device *dev,
const struct of_phandle_args *args)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct platform_device *iommu_pdev = of_find_device_by_node(args->np);
struct apple_dart *dart = platform_get_drvdata(iommu_pdev);
struct apple_dart *cfg_dart;
int i, sid;
if (args->args_count != 1)
return -EINVAL;
sid = args->args[0];
if (!cfg)
cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
if (!cfg)
return -ENOMEM;
dev_iommu_priv_set(dev, cfg);
cfg_dart = cfg->stream_maps[0].dart;
if (cfg_dart) {
if (cfg_dart->supports_bypass != dart->supports_bypass)
return -EINVAL;
if (cfg_dart->pgsize != dart->pgsize)
return -EINVAL;
}
for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
if (cfg->stream_maps[i].dart == dart) {
set_bit(sid, cfg->stream_maps[i].sidmap);
return 0;
}
}
for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) {
if (!cfg->stream_maps[i].dart) {
cfg->stream_maps[i].dart = dart;
set_bit(sid, cfg->stream_maps[i].sidmap);
return 0;
}
}
return -EINVAL;
}
static DEFINE_MUTEX(apple_dart_groups_lock);
static void apple_dart_release_group(void *iommu_data)
{
int i, sid;
struct apple_dart_stream_map *stream_map;
struct apple_dart_master_cfg *group_master_cfg = iommu_data;
mutex_lock(&apple_dart_groups_lock);
for_each_stream_map(i, group_master_cfg, stream_map)
for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams)
stream_map->dart->sid2group[sid] = NULL;
kfree(iommu_data);
mutex_unlock(&apple_dart_groups_lock);
}
static int apple_dart_merge_master_cfg(struct apple_dart_master_cfg *dst,
struct apple_dart_master_cfg *src)
{
/*
* We know that this function is only called for groups returned from
* pci_device_group and that all Apple Silicon platforms never spread
* PCIe devices from the same bus across multiple DARTs such that we can
* just assume that both src and dst only have the same single DART.
*/
if (src->stream_maps[1].dart)
return -EINVAL;
if (dst->stream_maps[1].dart)
return -EINVAL;
if (src->stream_maps[0].dart != dst->stream_maps[0].dart)
return -EINVAL;
bitmap_or(dst->stream_maps[0].sidmap,
dst->stream_maps[0].sidmap,
src->stream_maps[0].sidmap,
dst->stream_maps[0].dart->num_streams);
return 0;
}
static struct iommu_group *apple_dart_device_group(struct device *dev)
{
int i, sid;
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
struct apple_dart_stream_map *stream_map;
struct apple_dart_master_cfg *group_master_cfg;
struct iommu_group *group = NULL;
struct iommu_group *res = ERR_PTR(-EINVAL);
mutex_lock(&apple_dart_groups_lock);
for_each_stream_map(i, cfg, stream_map) {
for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams) {
struct iommu_group *stream_group =
stream_map->dart->sid2group[sid];
if (group && group != stream_group) {
res = ERR_PTR(-EINVAL);
goto out;
}
group = stream_group;
}
}
if (group) {
res = iommu_group_ref_get(group);
goto out;
}
#ifdef CONFIG_PCI
if (dev_is_pci(dev))
group = pci_device_group(dev);
else
#endif
group = generic_device_group(dev);
res = ERR_PTR(-ENOMEM);
if (!group)
goto out;
group_master_cfg = iommu_group_get_iommudata(group);
if (group_master_cfg) {
int ret;
ret = apple_dart_merge_master_cfg(group_master_cfg, cfg);
if (ret) {
dev_err(dev, "Failed to merge DART IOMMU groups.\n");
iommu_group_put(group);
res = ERR_PTR(ret);
goto out;
}
} else {
group_master_cfg = kmemdup(cfg, sizeof(*group_master_cfg),
GFP_KERNEL);
if (!group_master_cfg) {
iommu_group_put(group);
goto out;
}
iommu_group_set_iommudata(group, group_master_cfg,
apple_dart_release_group);
}
for_each_stream_map(i, cfg, stream_map)
for_each_set_bit(sid, stream_map->sidmap, stream_map->dart->num_streams)
stream_map->dart->sid2group[sid] = group;
res = group;
out:
mutex_unlock(&apple_dart_groups_lock);
return res;
}
static int apple_dart_def_domain_type(struct device *dev)
{
struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
if (cfg->stream_maps[0].dart->pgsize > PAGE_SIZE)
return IOMMU_DOMAIN_IDENTITY;
if (!cfg->stream_maps[0].dart->supports_bypass)
return IOMMU_DOMAIN_DMA;
return 0;
}
#ifndef CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR
/* Keep things compiling when CONFIG_PCI_APPLE isn't selected */
#define CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR 0
#endif
#define DOORBELL_ADDR (CONFIG_PCIE_APPLE_MSI_DOORBELL_ADDR & PAGE_MASK)
static void apple_dart_get_resv_regions(struct device *dev,
struct list_head *head)
{
if (IS_ENABLED(CONFIG_PCIE_APPLE) && dev_is_pci(dev)) {
struct iommu_resv_region *region;
int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
region = iommu_alloc_resv_region(DOORBELL_ADDR,
PAGE_SIZE, prot,
IOMMU_RESV_MSI, GFP_KERNEL);
if (!region)
return;
list_add_tail(®ion->list, head);
}
iommu_dma_get_resv_regions(dev, head);
}
static const struct iommu_ops apple_dart_iommu_ops = {
.identity_domain = &apple_dart_identity_domain,
.blocked_domain = &apple_dart_blocked_domain,
.domain_alloc_paging = apple_dart_domain_alloc_paging,
.probe_device = apple_dart_probe_device,
.release_device = apple_dart_release_device,
.device_group = apple_dart_device_group,
.of_xlate = apple_dart_of_xlate,
.def_domain_type = apple_dart_def_domain_type,
.get_resv_regions = apple_dart_get_resv_regions,
.pgsize_bitmap = -1UL, /* Restricted during dart probe */
.owner = THIS_MODULE,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = apple_dart_attach_dev_paging,
.map_pages = apple_dart_map_pages,
.unmap_pages = apple_dart_unmap_pages,
.flush_iotlb_all = apple_dart_flush_iotlb_all,
.iotlb_sync = apple_dart_iotlb_sync,
.iotlb_sync_map = apple_dart_iotlb_sync_map,
.iova_to_phys = apple_dart_iova_to_phys,
.free = apple_dart_domain_free,
}