linux/drivers/iommu/apple-dart.c
Uwe Kleine-König f80473183b iommu/apple-dart: Convert to platform remove callback returning void
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is (mostly) ignored
and this typically results in resource leaks. To improve here there is a
quest to make the remove callback return void. In the first step of this
quest all drivers are converted to .remove_new() which already returns
void.

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230321084125.337021-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Joerg Roedel <jroedel@suse.de>
2023-03-31 10:01:55 +02:00

1305 lines
35 KiB
C

// 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_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
* @force_bypass: force bypass mode due to pagesize mismatch?
* @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;
u32 force_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;
u32 command_reg;
spin_lock_irqsave(&stream_map->dart->lock, flags);
writel(stream_map->sidmap[0], stream_map->dart->regs + DART_T8020_STREAM_SELECT);
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 void apple_dart_iotlb_sync_map(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
apple_dart_domain_flush_tlb(to_dart_domain(domain));
}
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 iommu_domain *domain,
struct apple_dart_master_cfg *cfg)
{
struct apple_dart_domain *dart_domain = to_dart_domain(domain);
struct apple_dart *dart = cfg->stream_maps[0].dart;
struct io_pgtable_cfg pgtbl_cfg;
int ret = 0;
int i, j;
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, domain);
if (!dart_domain->pgtbl_ops) {
ret = -ENOMEM;
goto done;
}
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
domain->geometry.aperture_start = 0;
domain->geometry.aperture_end = (dma_addr_t)DMA_BIT_MASK(dart->ias);
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(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);
if (cfg->stream_maps[0].dart->force_bypass &&
domain->type != IOMMU_DOMAIN_IDENTITY)
return -EINVAL;
if (!cfg->stream_maps[0].dart->supports_bypass &&
domain->type == IOMMU_DOMAIN_IDENTITY)
return -EINVAL;
ret = apple_dart_finalize_domain(domain, cfg);
if (ret)
return ret;
switch (domain->type) {
case IOMMU_DOMAIN_DMA:
case IOMMU_DOMAIN_UNMANAGED:
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);
break;
case IOMMU_DOMAIN_BLOCKED:
for_each_stream_map(i, cfg, stream_map)
apple_dart_hw_disable_dma(stream_map);
break;
case IOMMU_DOMAIN_IDENTITY:
for_each_stream_map(i, cfg, stream_map)
apple_dart_hw_enable_bypass(stream_map);
break;
}
return ret;
}
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);
dev_iommu_priv_set(dev, NULL);
kfree(cfg);
}
static struct iommu_domain *apple_dart_domain_alloc(unsigned int type)
{
struct apple_dart_domain *dart_domain;
if (type != IOMMU_DOMAIN_DMA && type != IOMMU_DOMAIN_UNMANAGED &&
type != IOMMU_DOMAIN_IDENTITY && type != IOMMU_DOMAIN_BLOCKED)
return NULL;
dart_domain = kzalloc(sizeof(*dart_domain), GFP_KERNEL);
if (!dart_domain)
return NULL;
mutex_init(&dart_domain->init_lock);
/* no need to allocate pgtbl_ops or do any other finalization steps */
if (type == IOMMU_DOMAIN_IDENTITY || type == IOMMU_DOMAIN_BLOCKED)
dart_domain->finalized = true;
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, 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->force_bypass != dart->force_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 grups.\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->force_bypass)
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(&region->list, head);
}
iommu_dma_get_resv_regions(dev, head);
}
static const struct iommu_ops apple_dart_iommu_ops = {
.domain_alloc = apple_dart_domain_alloc,
.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,
.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,
}
};
static irqreturn_t apple_dart_t8020_irq(int irq, void *dev)
{
struct apple_dart *dart = dev;
const char *fault_name = NULL;
u32 error = readl(dart->regs + DART_T8020_ERROR);
u32 error_code = FIELD_GET(DART_T8020_ERROR_CODE, error);
u32 addr_lo = readl(dart->regs + DART_T8020_ERROR_ADDR_LO);
u32 addr_hi = readl(dart->regs + DART_T8020_ERROR_ADDR_HI);
u64 addr = addr_lo | (((u64)addr_hi) << 32);
u8 stream_idx = FIELD_GET(DART_T8020_ERROR_STREAM, error);
if (!(error & DART_T8020_ERROR_FLAG))
return IRQ_NONE;
/* there should only be a single bit set but let's use == to be sure */
if (error_code == DART_T8020_ERROR_READ_FAULT)
fault_name = "READ FAULT";
else if (error_code == DART_T8020_ERROR_WRITE_FAULT)
fault_name = "WRITE FAULT";
else if (error_code == DART_T8020_ERROR_NO_PTE)
fault_name = "NO PTE FOR IOVA";
else if (error_code == DART_T8020_ERROR_NO_PMD)
fault_name = "NO PMD FOR IOVA";
else if (error_code == DART_T8020_ERROR_NO_TTBR)
fault_name = "NO TTBR FOR IOVA";
else
fault_name = "unknown";
dev_err_ratelimited(
dart->dev,
"translation fault: status:0x%x stream:%d code:0x%x (%s) at 0x%llx",
error, stream_idx, error_code, fault_name, addr);
writel(error, dart->regs + DART_T8020_ERROR);
return IRQ_HANDLED;
}
static irqreturn_t apple_dart_t8110_irq(int irq, void *dev)
{
struct apple_dart *dart = dev;
const char *fault_name = NULL;
u32 error = readl(dart->regs + DART_T8110_ERROR);
u32 error_code = FIELD_GET(DART_T8110_ERROR_CODE, error);
u32 addr_lo = readl(dart->regs + DART_T8110_ERROR_ADDR_LO);
u32 addr_hi = readl(dart->regs + DART_T8110_ERROR_ADDR_HI);
u64 addr = addr_lo | (((u64)addr_hi) << 32);
u8 stream_idx = FIELD_GET(DART_T8110_ERROR_STREAM, error);
if (!(error & DART_T8110_ERROR_FLAG))
return IRQ_NONE;
/* there should only be a single bit set but let's use == to be sure */
if (error_code == DART_T8110_ERROR_READ_FAULT)
fault_name = "READ FAULT";
else if (error_code == DART_T8110_ERROR_WRITE_FAULT)
fault_name = "WRITE FAULT";
else if (error_code == DART_T8110_ERROR_NO_PTE)
fault_name = "NO PTE FOR IOVA";
else if (error_code == DART_T8110_ERROR_NO_PMD)
fault_name = "NO PMD FOR IOVA";
else if (error_code == DART_T8110_ERROR_NO_PGD)
fault_name = "NO PGD FOR IOVA";
else if (error_code == DART_T8110_ERROR_NO_TTBR)
fault_name = "NO TTBR FOR IOVA";
else
fault_name = "unknown";
dev_err_ratelimited(
dart->dev,
"translation fault: status:0x%x stream:%d code:0x%x (%s) at 0x%llx",
error, stream_idx, error_code, fault_name, addr);
writel(error, dart->regs + DART_T8110_ERROR);
return IRQ_HANDLED;
}
static int apple_dart_probe(struct platform_device *pdev)
{
int ret;
u32 dart_params[4];
struct resource *res;
struct apple_dart *dart;
struct device *dev = &pdev->dev;
dart = devm_kzalloc(dev, sizeof(*dart), GFP_KERNEL);
if (!dart)
return -ENOMEM;
dart->dev = dev;
dart->hw = of_device_get_match_data(dev);
spin_lock_init(&dart->lock);
dart->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(dart->regs))
return PTR_ERR(dart->regs);
if (resource_size(res) < 0x4000) {
dev_err(dev, "MMIO region too small (%pr)\n", res);
return -EINVAL;
}
dart->irq = platform_get_irq(pdev, 0);
if (dart->irq < 0)
return -ENODEV;
ret = devm_clk_bulk_get_all(dev, &dart->clks);
if (ret < 0)
return ret;
dart->num_clks = ret;
ret = clk_bulk_prepare_enable(dart->num_clks, dart->clks);
if (ret)
return ret;
dart_params[0] = readl(dart->regs + DART_PARAMS1);
dart_params[1] = readl(dart->regs + DART_PARAMS2);
dart->pgsize = 1 << FIELD_GET(DART_PARAMS1_PAGE_SHIFT, dart_params[0]);
dart->supports_bypass = dart_params[1] & DART_PARAMS2_BYPASS_SUPPORT;
switch (dart->hw->type) {
case DART_T8020:
case DART_T6000:
dart->ias = 32;
dart->oas = dart->hw->oas;
dart->num_streams = dart->hw->max_sid_count;
break;
case DART_T8110:
dart_params[2] = readl(dart->regs + DART_T8110_PARAMS3);
dart_params[3] = readl(dart->regs + DART_T8110_PARAMS4);
dart->ias = FIELD_GET(DART_T8110_PARAMS3_VA_WIDTH, dart_params[2]);
dart->oas = FIELD_GET(DART_T8110_PARAMS3_PA_WIDTH, dart_params[2]);
dart->num_streams = FIELD_GET(DART_T8110_PARAMS4_NUM_SIDS, dart_params[3]);
break;
}
if (dart->num_streams > DART_MAX_STREAMS) {
dev_err(&pdev->dev, "Too many streams (%d > %d)\n",
dart->num_streams, DART_MAX_STREAMS);
ret = -EINVAL;
goto err_clk_disable;
}
dart->force_bypass = dart->pgsize > PAGE_SIZE;
ret = apple_dart_hw_reset(dart);
if (ret)
goto err_clk_disable;
ret = request_irq(dart->irq, dart->hw->irq_handler, IRQF_SHARED,
"apple-dart fault handler", dart);
if (ret)
goto err_clk_disable;
platform_set_drvdata(pdev, dart);
ret = iommu_device_sysfs_add(&dart->iommu, dev, NULL, "apple-dart.%s",
dev_name(&pdev->dev));
if (ret)
goto err_free_irq;
ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev);
if (ret)
goto err_sysfs_remove;
dev_info(
&pdev->dev,
"DART [pagesize %x, %d streams, bypass support: %d, bypass forced: %d] initialized\n",
dart->pgsize, dart->num_streams, dart->supports_bypass, dart->force_bypass);
return 0;
err_sysfs_remove:
iommu_device_sysfs_remove(&dart->iommu);
err_free_irq:
free_irq(dart->irq, dart);
err_clk_disable:
clk_bulk_disable_unprepare(dart->num_clks, dart->clks);
return ret;
}
static void apple_dart_remove(struct platform_device *pdev)
{
struct apple_dart *dart = platform_get_drvdata(pdev);
apple_dart_hw_reset(dart);
free_irq(dart->irq, dart);
iommu_device_unregister(&dart->iommu);
iommu_device_sysfs_remove(&dart->iommu);
clk_bulk_disable_unprepare(dart->num_clks, dart->clks);
}
static const struct apple_dart_hw apple_dart_hw_t8103 = {
.type = DART_T8020,
.irq_handler = apple_dart_t8020_irq,
.invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
.oas = 36,
.fmt = APPLE_DART,
.max_sid_count = 16,
.enable_streams = DART_T8020_STREAMS_ENABLE,
.lock = DART_T8020_CONFIG,
.lock_bit = DART_T8020_CONFIG_LOCK,
.error = DART_T8020_ERROR,
.tcr = DART_T8020_TCR,
.tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
.tcr_disabled = 0,
.tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART,
.ttbr = DART_T8020_TTBR,
.ttbr_valid = DART_T8020_TTBR_VALID,
.ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
.ttbr_shift = DART_T8020_TTBR_SHIFT,
.ttbr_count = 4,
};
static const struct apple_dart_hw apple_dart_hw_t6000 = {
.type = DART_T6000,
.irq_handler = apple_dart_t8020_irq,
.invalidate_tlb = apple_dart_t8020_hw_invalidate_tlb,
.oas = 42,
.fmt = APPLE_DART2,
.max_sid_count = 16,
.enable_streams = DART_T8020_STREAMS_ENABLE,
.lock = DART_T8020_CONFIG,
.lock_bit = DART_T8020_CONFIG_LOCK,
.error = DART_T8020_ERROR,
.tcr = DART_T8020_TCR,
.tcr_enabled = DART_T8020_TCR_TRANSLATE_ENABLE,
.tcr_disabled = 0,
.tcr_bypass = DART_T8020_TCR_BYPASS_DAPF | DART_T8020_TCR_BYPASS_DART,
.ttbr = DART_T8020_TTBR,
.ttbr_valid = DART_T8020_TTBR_VALID,
.ttbr_addr_field_shift = DART_T8020_TTBR_ADDR_FIELD_SHIFT,
.ttbr_shift = DART_T8020_TTBR_SHIFT,
.ttbr_count = 4,
};
static const struct apple_dart_hw apple_dart_hw_t8110 = {
.type = DART_T8110,
.irq_handler = apple_dart_t8110_irq,
.invalidate_tlb = apple_dart_t8110_hw_invalidate_tlb,
.fmt = APPLE_DART2,
.max_sid_count = 256,
.enable_streams = DART_T8110_ENABLE_STREAMS,
.lock = DART_T8110_PROTECT,
.lock_bit = DART_T8110_PROTECT_TTBR_TCR,
.error = DART_T8110_ERROR,
.tcr = DART_T8110_TCR,
.tcr_enabled = DART_T8110_TCR_TRANSLATE_ENABLE,
.tcr_disabled = 0,
.tcr_bypass = DART_T8110_TCR_BYPASS_DAPF | DART_T8110_TCR_BYPASS_DART,
.ttbr = DART_T8110_TTBR,
.ttbr_valid = DART_T8110_TTBR_VALID,
.ttbr_addr_field_shift = DART_T8110_TTBR_ADDR_FIELD_SHIFT,
.ttbr_shift = DART_T8110_TTBR_SHIFT,
.ttbr_count = 1,
};
static __maybe_unused int apple_dart_suspend(struct device *dev)
{
struct apple_dart *dart = dev_get_drvdata(dev);
unsigned int sid, idx;
for (sid = 0; sid < dart->num_streams; sid++) {
dart->save_tcr[sid] = readl_relaxed(dart->regs + DART_TCR(dart, sid));
for (idx = 0; idx < dart->hw->ttbr_count; idx++)
dart->save_ttbr[sid][idx] =
readl(dart->regs + DART_TTBR(dart, sid, idx));
}
return 0;
}
static __maybe_unused int apple_dart_resume(struct device *dev)
{
struct apple_dart *dart = dev_get_drvdata(dev);
unsigned int sid, idx;
int ret;
ret = apple_dart_hw_reset(dart);
if (ret) {
dev_err(dev, "Failed to reset DART on resume\n");
return ret;
}
for (sid = 0; sid < dart->num_streams; sid++) {
for (idx = 0; idx < dart->hw->ttbr_count; idx++)
writel(dart->save_ttbr[sid][idx],
dart->regs + DART_TTBR(dart, sid, idx));
writel(dart->save_tcr[sid], dart->regs + DART_TCR(dart, sid));
}
return 0;
}
DEFINE_SIMPLE_DEV_PM_OPS(apple_dart_pm_ops, apple_dart_suspend, apple_dart_resume);
static const struct of_device_id apple_dart_of_match[] = {
{ .compatible = "apple,t8103-dart", .data = &apple_dart_hw_t8103 },
{ .compatible = "apple,t8110-dart", .data = &apple_dart_hw_t8110 },
{ .compatible = "apple,t6000-dart", .data = &apple_dart_hw_t6000 },
{},
};
MODULE_DEVICE_TABLE(of, apple_dart_of_match);
static struct platform_driver apple_dart_driver = {
.driver = {
.name = "apple-dart",
.of_match_table = apple_dart_of_match,
.suppress_bind_attrs = true,
.pm = pm_sleep_ptr(&apple_dart_pm_ops),
},
.probe = apple_dart_probe,
.remove_new = apple_dart_remove,
};
module_platform_driver(apple_dart_driver);
MODULE_DESCRIPTION("IOMMU API for Apple's DART");
MODULE_AUTHOR("Sven Peter <sven@svenpeter.dev>");
MODULE_LICENSE("GPL v2");