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tegrakernel/kernel/kernel-4.9/drivers/iommu/tegra-smmu.c

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/*
* IOMMU driver for SMMU on Tegra 3 series SoCs and later.
*
* Copyright (c) 2011-2017, 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.
*/
#define pr_fmt(fmt) "%s(): " fmt, __func__
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/device.h>
#include <linux/sched.h>
#include <linux/iommu.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_iommu.h>
#include <linux/of_platform.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/bitops.h>
#include <soc/tegra/chip-id.h>
#include <linux/tegra_smmu.h>
#include <linux/pci.h>
#include <soc/tegra/ahb.h>
#include <soc/tegra/fuse.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/outercache.h>
#include <asm/dma-iommu.h>
#include <dt-bindings/memory/tegra-swgroup.h>
/* HACK! This needs to come from device tree */
#include "../../arch/arm/mach-tegra/iomap.h"
#define CREATE_TRACE_POINTS
#include <trace/events/tegra_smmu.h>
#include "of_tegra-smmu.h"
#include "tegra-smmu.h"
enum {
_TLB = 0,
_PTC,
};
#define smmu_client_enable_hwgrp(c, m) smmu_client_set_hwgrp(c, m, 1)
#define smmu_client_disable_hwgrp(c) smmu_client_set_hwgrp(c, 0, 0)
#define __smmu_client_enable_hwgrp(c, m) __smmu_client_set_hwgrp(c, m, 1)
#define __smmu_client_disable_hwgrp(c) __smmu_client_set_hwgrp(c, 0, 0)
static struct device *save_smmu_device;
/* number of threshold map/unmap pages */
static size_t smmu_flush_all_th_map_pages = SZ_512;
static size_t smmu_flush_all_th_unmap_pages = SZ_512;
enum {
IOMMMS_PROPS_TEGRA_SWGROUP_BIT_HI = 0,
IOMMMS_PROPS_TEGRA_SWGROUP_BIT_LO = 1,
IOMMUS_PROPS_AS = 2,
};
struct tegra_smmu_chip_data {
int num_asids;
};
static size_t __smmu_iommu_iova_to_phys(struct smmu_as *as, dma_addr_t iova,
phys_addr_t *pa, int *npte);
static struct smmu_domain *to_smmu_domain(struct iommu_domain *dom)
{
return container_of(dom, struct smmu_domain, domain);
}
struct smmu_as *domain_to_as(struct iommu_domain *_domain,
unsigned long iova)
{
struct smmu_domain *domain = to_smmu_domain(_domain);
int idx;
BUG_ON(iova != -1 && !domain->bitmap[0]);
if (iova == -1 && !domain->bitmap[0])
return NULL;
if (iova == -1)
idx = __ffs(domain->bitmap[0]);
else
idx = SMMU_ASID_GET_IDX(iova);
BUG_ON(idx >= MAX_AS_PER_DEV);
return domain->as[idx];
}
static void dma_map_to_as_bitmap(struct dma_iommu_mapping *map,
unsigned long *bitmap)
{
int start_idx, end_idx;
start_idx = (int) ((u64)map->base >> 32);
end_idx = (int) ((u64)map->end >> 32);
BUG_ON(end_idx >= MAX_AS_PER_DEV);
*bitmap = 0;
while (start_idx <= end_idx) {
set_bit(start_idx, bitmap);
start_idx++;
}
}
static struct smmu_device *smmu_handle; /* unique for a system */
/*
* SMMU/AHB register accessors
*/
static inline u32 smmu_read(struct smmu_device *smmu, size_t offs)
{
return readl(smmu->regs + offs);
}
static inline void smmu_write(struct smmu_device *smmu, u32 val, size_t offs)
{
writel(val, smmu->regs + offs);
}
static inline u32 ahb_read(struct smmu_device *smmu, size_t offs)
{
return readl(smmu->regs_ahbarb + offs);
}
static inline void ahb_write(struct smmu_device *smmu, u32 val, size_t offs)
{
writel(val, smmu->regs_ahbarb + offs);
}
#define VA_PAGE_TO_PA(va, page) \
(page_to_phys(page) + ((unsigned long)(va) & ~PAGE_MASK))
#define VA_PAGE_TO_PA_HI(va, page) \
(u32)((u64)(page_to_phys(page)) >> 32)
#define FLUSH_CPU_DCACHE(va, page, size) \
do { \
unsigned long _pa_ = VA_PAGE_TO_PA(va, page); \
FLUSH_DCACHE_AREA((void *)(va), (size_t)(size)); \
outer_flush_range(_pa_, _pa_+(size_t)(size)); \
} while (0)
/*
* Any interaction between any block on PPSB and a block on APB or AHB
* must have these read-back barriers to ensure the APB/AHB bus
* transaction is complete before initiating activity on the PPSB
* block.
*/
#define FLUSH_SMMU_REGS(smmu) smmu_read(smmu, SMMU_PTB_ASID)
static struct of_device_id tegra_smmu_of_match[];
static struct smmu_client *tegra_smmu_find_client(struct smmu_device *smmu,
struct device *dev)
{
struct rb_node *node = smmu->clients.rb_node;
while (node) {
struct smmu_client *client;
client = container_of(node, struct smmu_client, node);
if (dev < client->dev)
node = node->rb_left;
else if (dev > client->dev)
node = node->rb_right;
else
return client;
}
return NULL;
}
static int tegra_smmu_insert_client(struct smmu_device *smmu,
struct smmu_client *client)
{
struct rb_node **new, *parent;
new = &smmu->clients.rb_node;
parent = NULL;
while (*new) {
struct smmu_client *this;
this = container_of(*new, struct smmu_client, node);
parent = *new;
if (client->dev < this->dev)
new = &((*new)->rb_left);
else if (client->dev > this->dev)
new = &((*new)->rb_right);
else
return -EEXIST;
}
rb_link_node(&client->node, parent, new);
rb_insert_color(&client->node, &smmu->clients);
return 0;
}
static struct smmu_client *tegra_smmu_register_client(struct smmu_device *smmu,
struct device *dev, u64 swgids,
struct smmu_map_prop *prop)
{
int err;
struct smmu_client *client;
client = tegra_smmu_find_client(smmu, dev);
if (client) {
dev_err(dev,
"rejecting multiple registrations for client device %s\n",
dev->of_node ? dev->of_node->full_name : "<no device node>");
return NULL;
}
client = devm_kzalloc(smmu->dev, sizeof(*client), GFP_KERNEL);
if (!client)
return NULL;
client->dev = dev;
client->swgids = swgids;
client->prop = prop;
err = tegra_smmu_insert_client(smmu, client);
if (err) {
devm_kfree(smmu->dev, client);
return NULL;
}
return client;
}
static u64 tegra_smmu_get_swgids(struct device *dev)
{
u64 swgids = SWGIDS_ERROR_CODE;
struct smmu_client *client;
struct iommu_linear_map *area = NULL;
struct smmu_map_prop *prop;
swgids = tegra_smmu_of_get_swgids(dev, tegra_smmu_of_match, &area);
if (swgids_is_error(swgids))
return SWGIDS_ERROR_CODE;
if (!smmu_handle) {
dev_info(dev, "SMMU isn't ready yet\n");
return SWGIDS_ERROR_CODE;
}
client = tegra_smmu_find_client(smmu_handle, dev);
if (client)
return client->swgids;
list_for_each_entry(prop, &smmu_handle->asprops, list)
if (swgids & prop->swgid_mask)
goto found;
dev_err(dev, "Unable to retrieve as prop for swgids:%lld\n", swgids);
return SWGIDS_ERROR_CODE;
found:
prop->area = area;
client = tegra_smmu_register_client(smmu_handle, dev, swgids, prop);
if (!client)
swgids = SWGIDS_ERROR_CODE;
return swgids;
}
static int __smmu_client_set_hwgrp_default(struct smmu_client *c, u64 map, int on)
{
int i;
struct smmu_domain *dom = c->domain;
struct smmu_as *as = smmu_as_bitmap(dom);
u32 val, offs, mask = 0;
struct smmu_device *smmu = as->smmu;
WARN_ON(!on && map);
if (on && !map)
return -EINVAL;
if (!on)
map = c->swgids;
for_each_set_bit(i, (unsigned long *)&(dom->bitmap),
MAX_AS_PER_DEV)
mask |= SMMU_ASID_ENABLE(dom->as[i]->asid, i);
for_each_set_bit(i, (unsigned long *)&map, HWGRP_COUNT) {
offs = tegra_smmu_of_offset(i);
val = smmu_read(smmu, offs);
val &= ~SMMU_ASID_MASK; /* always overwrite ASID */
if (on)
val |= mask;
else if (list_empty(&c->list))
val = 0; /* turn off if this is the last */
else
return 0; /* leave if off but not the last */
smmu_write(smmu, val, offs);
dev_dbg(c->dev, "swgid:%d asid:%d %s @%s\n",
i, val & SMMU_ASID_MASK,
(val & BIT(31)) ? "Enabled" : "Disabled", __func__);
}
FLUSH_SMMU_REGS(smmu);
c->swgids = map;
return 0;
}
static int smmu_client_set_hwgrp(struct smmu_client *c, u64 map, int on)
{
int val;
unsigned long flags;
struct smmu_domain *dom = c->domain;
struct smmu_as *as = smmu_as_bitmap(dom);
struct smmu_device *smmu = as->smmu;
spin_lock_irqsave(&smmu->lock, flags);
val = __smmu_client_set_hwgrp(c, map, on);
spin_unlock_irqrestore(&smmu->lock, flags);
return val;
}
/*
* Flush all TLB entries and all PTC entries
* Caller must lock smmu
*/
static void smmu_flush_regs(struct smmu_device *smmu, int enable)
{
u32 val;
smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
FLUSH_SMMU_REGS(smmu);
val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
SMMU_TLB_FLUSH_ASID_MATCH_disable;
smmu_write(smmu, val, SMMU_TLB_FLUSH);
if (enable)
smmu_write(smmu, SMMU_CONFIG_ENABLE, SMMU_CONFIG);
FLUSH_SMMU_REGS(smmu);
}
static void smmu_setup_regs(struct smmu_device *smmu)
{
int i;
u32 val;
for (i = 0; i < smmu->num_as; i++) {
struct smmu_as *as = &smmu->as[i];
struct smmu_client *c;
smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
val = as->pdir_page ?
SMMU_MK_PDIR(as->pdir_page, as->pdir_attr) :
SMMU_PTB_DATA_RESET_VAL;
smmu_write(smmu, val, SMMU_PTB_DATA);
list_for_each_entry(c, &as->client, list)
__smmu_client_set_hwgrp(c, c->swgids, 1);
}
val = SMMU_PTC_CONFIG_RESET_VAL;
val |= SMMU_PTC_REQ_LIMIT;
if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU_NOPTC))
val &= ~SMMU_PTC_CONFIG_CACHE__ENABLE;
smmu_write(smmu, val, SMMU_CACHE_CONFIG(_PTC));
val = SMMU_TLB_CONFIG_RESET_VAL;
if ((IS_ENABLED(CONFIG_ARCH_TEGRA_12x_SOC) &&
(tegra_get_chip_id() == TEGRA124)) ||
(IS_ENABLED(CONFIG_ARCH_TEGRA_13x_SOC) &&
(tegra_get_chip_id() == TEGRA132)))
val |= SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE << 1;
else /* T210. */
val |= (SMMU_TLB_CONFIG_ACTIVE_LINES__VALUE * 3);
if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU_NOTLB))
val &= ~SMMU_TLB_CONFIG_ACTIVE_LINES__MASK;
smmu_write(smmu, val, SMMU_CACHE_CONFIG(_TLB));
if (IS_ENABLED(CONFIG_ARCH_TEGRA_12x_SOC) &&
(tegra_get_chip_id() == TEGRA124))
smmu_flush_regs(smmu, 1);
else /* T132+ */
smmu_flush_regs(smmu, 0);
if (tegra_get_chip_id() == TEGRA30
|| tegra_get_chip_id() == TEGRA114
|| tegra_get_chip_id() == TEGRA148) {
val = ahb_read(smmu, AHB_XBAR_CTRL);
val |= AHB_XBAR_CTRL_SMMU_INIT_DONE_DONE <<
AHB_XBAR_CTRL_SMMU_INIT_DONE_SHIFT;
ahb_write(smmu, val, AHB_XBAR_CTRL);
}
/* On T114, Set PPCS1 ASID for SDMMC */
if (tegra_get_chip_id() == TEGRA114)
ahb_write(smmu, AHB_MASTER_SELECT_SDMMC, AHB_MASTER_SWID_0);
}
static void __smmu_flush_ptc(struct smmu_device *smmu, u32 *pte,
struct page *page)
{
u32 val;
ulong flags;
if (WARN_ON(!virt_addr_valid(pte)))
return;
if (WARN_ON(!pfn_valid(page_to_pfn(page))))
return;
val = VA_PAGE_TO_PA_HI(pte, page);
spin_lock_irqsave(&smmu->ptc_lock, flags);
smmu_write(smmu, val, SMMU_PTC_FLUSH_1);
val = VA_PAGE_TO_PA(pte, page);
val &= SMMU_PTC_FLUSH_ADR_MASK;
val |= SMMU_PTC_FLUSH_TYPE_ADR;
smmu_write(smmu, val, SMMU_PTC_FLUSH);
spin_unlock_irqrestore(&smmu->ptc_lock, flags);
}
static void smmu_flush_ptc(struct smmu_device *smmu, u32 *pte,
struct page *page)
{
__smmu_flush_ptc(smmu, pte, page);
FLUSH_SMMU_REGS(smmu);
}
static inline void __smmu_flush_ptc_all(struct smmu_device *smmu)
{
smmu_write(smmu, SMMU_PTC_FLUSH_TYPE_ALL, SMMU_PTC_FLUSH);
}
static void __smmu_flush_tlb(struct smmu_device *smmu, struct smmu_as *as,
dma_addr_t iova, int is_pde)
{
u32 val;
if (is_pde)
val = SMMU_TLB_FLUSH_VA(iova, SECTION);
else
val = SMMU_TLB_FLUSH_VA(iova, GROUP);
smmu_write(smmu, val, SMMU_TLB_FLUSH);
}
static inline void __smmu_flush_tlb_section(struct smmu_as *as, dma_addr_t iova)
{
__smmu_flush_tlb(as->smmu, as, iova, 1);
}
static void flush_ptc_and_tlb_default(struct smmu_device *smmu,
struct smmu_as *as, dma_addr_t iova,
u32 *pte, struct page *page, int is_pde)
{
__smmu_flush_ptc(smmu, pte, page);
__smmu_flush_tlb(smmu, as, iova, is_pde);
FLUSH_SMMU_REGS(smmu);
}
#ifdef CONFIG_TEGRA_ERRATA_1053704
/* Flush PTEs within the same L2 pagetable */
static void ____smmu_flush_tlb_range(struct smmu_device *smmu, dma_addr_t iova,
dma_addr_t end)
{
size_t unit = SZ_16K;
iova = round_down(iova, unit);
while (iova < end) {
u32 val;
val = SMMU_TLB_FLUSH_VA(iova, GROUP);
smmu_write(smmu, val, SMMU_TLB_FLUSH);
iova += unit;
}
}
#endif
static void flush_ptc_and_tlb_range_default(struct smmu_device *smmu,
struct smmu_as *as, dma_addr_t iova,
u32 *pte, struct page *page,
size_t count)
{
int tlb_cache_line = 32; /* after T124 */
int ptc_iova_line = (smmu->ptc_cache_line / sizeof(*pte)) << SMMU_PAGE_SHIFT;
int tlb_iova_line = (tlb_cache_line / sizeof(*pte)) << SMMU_PAGE_SHIFT;
dma_addr_t end = iova + count * PAGE_SIZE;
BUG_ON(smmu->ptc_cache_line < tlb_cache_line);
iova = round_down(iova, ptc_iova_line);
while (iova < end) {
int i;
smmu_flush_ptc(smmu, pte, page);
pte += smmu->ptc_cache_line / sizeof(*pte);
for (i = 0; i < ptc_iova_line / tlb_iova_line; i++) {
u32 val;
val = SMMU_TLB_FLUSH_VA(iova, GROUP);
smmu_write(smmu, val, SMMU_TLB_FLUSH);
iova += tlb_iova_line;
}
}
FLUSH_SMMU_REGS(smmu);
}
static inline void flush_ptc_and_tlb_all(struct smmu_device *smmu,
struct smmu_as *as)
{
flush_ptc_and_tlb(smmu, as, 0, 0, NULL, 1);
}
static void free_ptbl(struct smmu_as *as, dma_addr_t iova, bool flush)
{
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = (u32 *)page_address(as->pdir_page);
if (pdir[pdn] != _PDE_VACANT(pdn)) {
dev_dbg(as->smmu->dev, "pdn: %x\n", pdn);
if (pdir[pdn] & _PDE_NEXT)
__free_page(SMMU_EX_PTBL_PAGE(pdir[pdn]));
pdir[pdn] = _PDE_VACANT(pdn);
FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
if (!flush)
return;
flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
as->pdir_page, 1);
}
}
#ifdef CONFIG_TEGRA_ERRATA_1053704
static void __smmu_flush_tlb_range(struct smmu_as *as, dma_addr_t iova,
dma_addr_t end)
{
u32 *pdir;
struct smmu_device *smmu = as->smmu;
if (!pfn_valid(page_to_pfn(as->pdir_page)))
return;
pdir = page_address(as->pdir_page);
while (iova < end) {
int pdn = SMMU_ADDR_TO_PDN(iova);
if (pdir[pdn] & _PDE_NEXT) {
struct page *page = SMMU_EX_PTBL_PAGE(pdir[pdn]);
dma_addr_t _end = min_t(dma_addr_t, end,
SMMU_PDN_TO_ADDR(pdn + 1));
if (pfn_valid(page_to_pfn(page)))
____smmu_flush_tlb_range(smmu, iova, _end);
iova = _end;
} else {
if (pdir[pdn])
__smmu_flush_tlb_section(as, iova);
iova = SMMU_PDN_TO_ADDR(pdn + 1);
}
if (pdn == SMMU_PTBL_COUNT - 1)
break;
}
}
static void __smmu_flush_tlb_as(struct smmu_as *as, dma_addr_t iova,
dma_addr_t end)
{
__smmu_flush_tlb_range(as, iova, end);
}
#else
static void __smmu_flush_tlb_as(struct smmu_as *as, dma_addr_t iova,
dma_addr_t end)
{
u32 val;
struct smmu_device *smmu = as->smmu;
val = SMMU_TLB_FLUSH_ASID_ENABLE |
(as->asid << SMMU_TLB_FLUSH_ASID_SHIFT(as));
smmu_write(smmu, val, SMMU_TLB_FLUSH);
}
#endif
static void flush_ptc_and_tlb_as_default(struct smmu_as *as, dma_addr_t start,
dma_addr_t end)
{
struct smmu_device *smmu = as->smmu;
__smmu_flush_ptc_all(smmu);
__smmu_flush_tlb_as(as, start, end);
FLUSH_SMMU_REGS(smmu);
}
static void free_pdir_default(struct smmu_as *as)
{
unsigned long addr;
int count;
struct device *dev = as->smmu->dev;
if (!as->pdir_page)
return;
addr = as->smmu->iovmm_base;
count = as->smmu->page_count;
while (count-- > 0) {
free_ptbl(as, addr, 1);
addr += SMMU_PAGE_SIZE * SMMU_PTBL_COUNT;
}
__free_page(as->pdir_page);
as->pdir_page = NULL;
devm_kfree(dev, as->pte_count);
as->pte_count = NULL;
}
static struct page *alloc_ptbl(struct smmu_as *as, dma_addr_t iova, bool flush)
{
u32 *pdir = page_address(as->pdir_page);
int pdn = SMMU_ADDR_TO_PDN(iova);
struct page *page;
u32 *ptbl;
gfp_t gfp = GFP_ATOMIC;
if (IS_ENABLED(CONFIG_PREEMPT) && !in_atomic())
gfp = GFP_KERNEL;
gfp |= __GFP_ZERO;
/* Vacant - allocate a new page table */
dev_dbg(as->smmu->dev, "New PTBL pdn: %x\n", pdn);
page = alloc_page(gfp);
if (!page)
return NULL;
ptbl = (u32 *)page_address(page);
FLUSH_CPU_DCACHE(ptbl, page, SMMU_PTBL_SIZE);
pdir[pdn] = SMMU_MK_PDE(page, as->pde_attr | _PDE_NEXT);
FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
if (flush)
flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn],
as->pdir_page, 1);
return page;
}
/*
* Maps PTBL for given iova and returns the PTE address
* Caller must unmap the mapped PTBL returned in *ptbl_page_p
*/
static u32 *locate_pte(struct smmu_as *as,
dma_addr_t iova, bool allocate,
struct page **ptbl_page_p,
unsigned int **count)
{
int ptn = SMMU_ADDR_TO_PTN(iova);
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = page_address(as->pdir_page);
u32 *ptbl;
if (pdir[pdn] != _PDE_VACANT(pdn)) {
/* Mapped entry table already exists */
*ptbl_page_p = SMMU_EX_PTBL_PAGE(pdir[pdn]);
if (!(pdir[pdn] & _PDE_NEXT)) {
WARN(1, "error:locate pte req on pde mapping, asid=%d "
"iova=%pa pdir[%d]=0x%x ptbl=%p, ptn=%d\n",
as->asid, &iova, pdn, pdir[pdn],
page_address(*ptbl_page_p), ptn);
return NULL;
}
} else if (!allocate) {
return NULL;
} else {
*ptbl_page_p = alloc_ptbl(as, iova, 1);
if (!*ptbl_page_p)
return NULL;
}
ptbl = page_address(*ptbl_page_p);
*count = &as->pte_count[pdn];
return &ptbl[ptn];
}
#ifdef CONFIG_SMMU_SIG_DEBUG
static void put_signature(struct smmu_as *as,
dma_addr_t iova, unsigned long pfn)
{
struct page *page;
u32 *vaddr;
page = pfn_to_page(pfn);
vaddr = page_address(page);
if (!vaddr)
return;
vaddr[0] = iova;
vaddr[1] = pfn << PAGE_SHIFT;
FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2);
}
#else
static inline void put_signature(struct smmu_as *as,
unsigned long addr, unsigned long pfn)
{
}
#endif
/*
* Caller must not hold as->lock
*/
static int alloc_pdir(struct smmu_as *as)
{
u32 *pdir;
unsigned long flags;
int pdn, err = 0;
u32 val;
struct smmu_device *smmu = as->smmu;
struct page *page;
unsigned int *cnt;
/*
* do the allocation, then grab as->lock
*/
cnt = devm_kzalloc(smmu->dev,
sizeof(cnt[0]) * SMMU_PDIR_COUNT,
GFP_KERNEL);
page = alloc_page(GFP_KERNEL | __GFP_DMA);
spin_lock_irqsave(&as->lock, flags);
if (as->pdir_page) {
/* We raced, free the redundant */
err = -EAGAIN;
goto err_out;
}
if (!page || !cnt) {
dev_err(smmu->dev, "failed to allocate at %s\n", __func__);
err = -ENOMEM;
goto err_out;
}
as->pdir_page = page;
as->pte_count = cnt;
pdir = page_address(as->pdir_page);
for (pdn = 0; pdn < SMMU_PDIR_COUNT; pdn++)
pdir[pdn] = _PDE_VACANT(pdn);
FLUSH_CPU_DCACHE(pdir, as->pdir_page, SMMU_PDIR_SIZE);
smmu_flush_ptc(smmu, pdir, as->pdir_page);
val = SMMU_TLB_FLUSH_VA_MATCH_ALL |
SMMU_TLB_FLUSH_ASID_MATCH__ENABLE |
(as->asid << SMMU_TLB_FLUSH_ASID_SHIFT(as));
smmu_write(smmu, val, SMMU_TLB_FLUSH);
FLUSH_SMMU_REGS(as->smmu);
spin_unlock_irqrestore(&as->lock, flags);
return 0;
err_out:
spin_unlock_irqrestore(&as->lock, flags);
if (page)
__free_page(page);
if (cnt)
devm_kfree(smmu->dev, cnt);
return err;
}
static size_t __smmu_iommu_unmap_pages(struct smmu_as *as, dma_addr_t iova,
size_t bytes)
{
int total = bytes >> PAGE_SHIFT;
u32 *pdir = page_address(as->pdir_page);
struct smmu_device *smmu = as->smmu;
unsigned long iova_base = iova;
bool flush_all = (total > smmu_flush_all_th_unmap_pages) ? true : false;
while (total > 0) {
int ptn = SMMU_ADDR_TO_PTN(iova);
int pdn = SMMU_ADDR_TO_PDN(iova);
struct page *page;
u32 *ptbl;
u32 *pte;
int count;
if (!(pdir[pdn] & _PDE_NEXT))
break;
page = SMMU_EX_PTBL_PAGE(pdir[pdn]);
BUG_ON(!pfn_valid(page_to_pfn(page)));
ptbl = page_address(page);
pte = &ptbl[ptn];
count = min_t(int, SMMU_PTBL_COUNT - ptn, total);
dev_dbg(as->smmu->dev, "unmapping %d pages at once\n", count);
if (pte) {
int i;
unsigned int *rest = &as->pte_count[pdn];
size_t pte_bytes = sizeof(*pte) * count;
trace_smmu_set_pte(as->asid,
iova, 0, count * PAGE_SIZE, 0);
for (i = 0; i < count; i++) {
if (pte[i] == _PTE_VACANT(iova + i * PAGE_SIZE))
WARN(1, "error:unmap req on vacant pte, iova=%llx",
(u64)(iova + i * PAGE_SIZE));
}
*rest -= count;
if (*rest) {
memset(pte, 0, pte_bytes);
FLUSH_CPU_DCACHE(pte, page, pte_bytes);
} else {
free_ptbl(as, iova, !flush_all);
}
if (!flush_all)
flush_ptc_and_tlb_range(smmu, as, iova, pte,
page, count);
}
iova += PAGE_SIZE * count;
total -= count;
}
bytes -= total << PAGE_SHIFT;
if (bytes && flush_all)
flush_ptc_and_tlb_as(as, iova_base,
iova_base + bytes);
return bytes;
}
static size_t __smmu_iommu_unmap_largepage(struct smmu_as *as, dma_addr_t iova)
{
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = (u32 *)page_address(as->pdir_page);
pdir[pdn] = _PDE_VACANT(pdn);
trace_smmu_set_pte(as->asid, iova, 0, SZ_4M, 0);
FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], as->pdir_page, 1);
return SZ_4M;
}
static int __smmu_iommu_map_pfn_default(struct smmu_as *as, dma_addr_t iova,
unsigned long pfn, unsigned long prot)
{
struct smmu_device *smmu = as->smmu;
u32 *pte;
unsigned int *count;
struct page *page;
int attrs = as->pte_attr;
pte = locate_pte(as, iova, true, &page, &count);
if (WARN_ON(!pte))
return -ENOMEM;
if (*pte != _PTE_VACANT(iova)) {
phys_addr_t pa = PFN_PHYS(pfn);
if (!pfn_valid(pfn)) {
dev_info(smmu->dev, "pfn is invalid, remap is expected "
"pfn=0x%lx", pfn);
} else
WARN(1, "error:map req on already mapped pte, "
"asid=%d iova=%pa pa=%pa prot=%lx *pte=%x\n",
as->asid, &iova, &pa, prot, *pte);
return -EINVAL;
}
(*count)++;
if ((prot & IOMMU_READ) && (!(prot & IOMMU_WRITE)))
attrs &= ~_WRITABLE;
else if ((prot & IOMMU_WRITE) && (!(prot & IOMMU_READ)))
attrs &= ~_READABLE;
*pte = SMMU_PFN_TO_PTE(pfn, attrs);
trace_smmu_set_pte(as->asid, iova, PFN_PHYS(pfn), PAGE_SIZE, attrs);
FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
flush_ptc_and_tlb(smmu, as, iova, pte, page, 0);
put_signature(as, iova, pfn);
return 0;
}
static int __smmu_iommu_map_page(struct smmu_as *as, dma_addr_t iova,
phys_addr_t pa, unsigned long prot)
{
unsigned long pfn = __phys_to_pfn(pa);
return __smmu_iommu_map_pfn(as, iova, pfn, prot);
}
static int __smmu_iommu_map_largepage_default(struct smmu_as *as, dma_addr_t iova,
phys_addr_t pa, unsigned long prot)
{
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = (u32 *)page_address(as->pdir_page);
int attrs = _PDE_ATTR;
BUG_ON(!IS_ALIGNED(iova, SZ_4M));
BUG_ON(!IS_ALIGNED(pa, SZ_4M));
if (pdir[pdn] != _PDE_VACANT(pdn)) {
phys_addr_t stale;
size_t bytes;
int npte;
bytes = __smmu_iommu_iova_to_phys(as, iova, &stale, &npte);
WARN(1, "map req on already mapped pde, asid=%d iova=%pa "
"(new)pa=%pa (stale)pa=%pa bytes=%zx pdir[%d]=0x%x npte=%d\n",
as->asid, &iova, &pa, &stale, bytes, pdn, pdir[pdn], npte);
return -EINVAL;
}
if ((prot & IOMMU_READ) && (!(prot & IOMMU_WRITE)))
attrs &= ~_WRITABLE;
else if ((prot & IOMMU_WRITE) && (!(prot & IOMMU_READ)))
attrs &= ~_READABLE;
pdir[pdn] = pa >> SMMU_PDE_SHIFT | attrs;
trace_smmu_set_pte(as->asid, iova, pa, SZ_4M, attrs);
FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof pdir[pdn]);
flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], as->pdir_page, 1);
return 0;
}
static int smmu_iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t pa, size_t bytes, unsigned long prot)
{
struct smmu_as *as = domain_to_as(domain, iova);
unsigned long flags;
int err;
int (*fn)(struct smmu_as *as, dma_addr_t iova, phys_addr_t pa,
unsigned long prot);
dev_dbg(as->smmu->dev, "[%d] %pad:%pap\n", as->asid, &iova, &pa);
switch (bytes) {
case SZ_4K:
fn = __smmu_iommu_map_page;
break;
case SZ_4M:
BUG_ON(IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU_NO4MB));
fn = __smmu_iommu_map_largepage;
break;
default:
WARN(1, "map of size %zu is not supported\n", bytes);
return -EINVAL;
}
spin_lock_irqsave(&as->lock, flags);
err = fn(as, iova, pa, prot);
spin_unlock_irqrestore(&as->lock, flags);
return err;
}
/* Remap a 4MB large page entry to 1024 * 4KB pages entries */
static int __smmu_iommu_remap_largepage(struct smmu_as *as, dma_addr_t iova)
{
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = page_address(as->pdir_page);
unsigned long pfn = __phys_to_pfn(pdir[pdn] << SMMU_PDE_SHIFT);
unsigned int *rest = &as->pte_count[pdn];
gfp_t gfp = GFP_ATOMIC;
u32 *pte;
struct page *page;
int i;
BUG_ON(!IS_ALIGNED(iova, SZ_4M));
BUG_ON(pdir[pdn] & _PDE_NEXT);
WARN(1, "split 4MB mapping into 4KB mappings upon partial unmap req,"
"iova=%pa", &iova);
/* Prepare L2 page table in advance */
if (IS_ENABLED(CONFIG_PREEMPT) && !in_atomic())
gfp = GFP_KERNEL;
page = alloc_page(gfp);
if (!page)
return -ENOMEM;
pte = (u32 *)page_address(page);
*rest = SMMU_PTBL_COUNT;
for (i = 0; i < SMMU_PTBL_COUNT; i++)
*(pte + i) = SMMU_PFN_TO_PTE(pfn + i, as->pte_attr);
FLUSH_CPU_DCACHE(pte, page, SMMU_PTBL_SIZE);
/* Update pde */
pdir[pdn] = SMMU_MK_PDE(page, as->pde_attr | _PDE_NEXT);
FLUSH_CPU_DCACHE(&pdir[pdn], as->pdir_page, sizeof(pdir[pdn]));
flush_ptc_and_tlb(as->smmu, as, iova, &pdir[pdn], as->pdir_page, 1);
return 0;
}
static size_t __smmu_iommu_unmap_default(struct smmu_as *as, dma_addr_t iova,
size_t bytes)
{
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = page_address(as->pdir_page);
if (pdir[pdn] == _PDE_VACANT(pdn)) {
WARN(1, "error:unmap req on vacant pde: as=%d "
"iova=%pa bytes=%zx\n",
as->asid, &iova, bytes);
return 0;
} else if (pdir[pdn] & _PDE_NEXT) {
return __smmu_iommu_unmap_pages(as, iova, bytes);
} else { /* 4MB PDE */
BUG_ON(IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU_NO4MB));
BUG_ON(!IS_ALIGNED(iova, SZ_4M));
if (bytes < SZ_4M) {
int err;
err = __smmu_iommu_remap_largepage(as, iova);
if (err)
return 0;
return __smmu_iommu_unmap_pages(as, iova, bytes);
}
return __smmu_iommu_unmap_largepage(as, iova);
}
}
static size_t smmu_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
size_t bytes)
{
struct smmu_as *as = domain_to_as(domain, iova);
unsigned long flags;
size_t unmapped;
dev_dbg(as->smmu->dev, "[%d] %pad\n", as->asid, &iova);
spin_lock_irqsave(&as->lock, flags);
unmapped = __smmu_iommu_unmap(as, iova, bytes);
spin_unlock_irqrestore(&as->lock, flags);
return unmapped;
}
static size_t __smmu_iommu_iova_to_phys(struct smmu_as *as, dma_addr_t iova,
phys_addr_t *pa, int *npte)
{
int pdn = SMMU_ADDR_TO_PDN(iova);
u32 *pdir = page_address(as->pdir_page);
size_t bytes = ~0;
*pa = ~0;
*npte = 0;
if (pdir[pdn] & _PDE_NEXT) {
u32 *pte;
struct page *page;
unsigned int *count;
pte = locate_pte(as, iova, false, &page, &count);
if (!pte)
return ~0;
*pa = PFN_PHYS(*pte & SMMU_PFN_MASK);
*pa += iova & (PAGE_SIZE - 1);
bytes = PAGE_SIZE;
*npte = *count;
} else if (pdir[pdn]) {
*pa = ((phys_addr_t)(pdir[pdn] & SMMU_PFN_MASK)) <<
SMMU_PDE_SHIFT;
*pa += iova & (SZ_4M - 1);
bytes = SZ_4M;
}
return bytes;
}
static phys_addr_t smmu_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
struct smmu_as *as = domain_to_as(domain, iova);
phys_addr_t pa;
int unused;
unsigned long flags;
spin_lock_irqsave(&as->lock, flags);
__smmu_iommu_iova_to_phys(as, iova, &pa, &unused);
spin_unlock_irqrestore(&as->lock, flags);
return pa;
}
static bool smmu_iommu_capable(enum iommu_cap cap)
{
return false;
}
#if defined(CONFIG_DMA_API_DEBUG) || defined(CONFIG_FTRACE)
/* maximum asids supported is 128, so it is 3 digits */
#define DIGITS_PER_ASID 3
/* one char for each digit and one more for space */
#define CHAR_PER_ASID (DIGITS_PER_ASID + 1)
#define BUF_SZ (MAX_AS_PER_DEV * CHAR_PER_ASID + 1)
char *debug_dma_platformdata(struct device *dev)
{
static char buf[BUF_SZ];
struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
int asid = -1;
if (mapping) {
struct smmu_domain *dom = to_smmu_domain(mapping->domain);
int i, len = 0;
for_each_set_bit(i, (unsigned long *)&(dom->bitmap),
MAX_AS_PER_DEV) {
asid = dom->as[i]->asid;
len += snprintf(buf + len, CHAR_PER_ASID, "%*d ",
DIGITS_PER_ASID, asid);
}
} else
(void)snprintf(buf, CHAR_PER_ASID, "%d", asid);
return buf;
}
#endif
static const struct file_operations smmu_ptdump_fops;
static const struct file_operations smmu_iova2pa_fops;
static const struct file_operations smmu_iovadump_fops;
static void debugfs_create_as(struct smmu_as *as)
{
struct dentry *dent;
char name[] = "as000";
sprintf(name, "as%03d", as->asid);
dent = debugfs_create_dir(name, as->smmu->debugfs_root);
if (!dent)
return;
as->debugfs_root = dent;
debugfs_create_file("iovainfo", S_IRUSR, as->debugfs_root,
as, &smmu_ptdump_fops);
debugfs_create_file("iova_to_phys", S_IRUSR, as->debugfs_root,
as, &smmu_iova2pa_fops);
debugfs_create_file("iova_dump", S_IRUSR, as->debugfs_root,
as, &smmu_iovadump_fops);
}
static struct smmu_as *smmu_as_alloc_default(void)
{
int i, err = -EAGAIN;
unsigned long flags;
struct smmu_as *as;
struct smmu_device *smmu = smmu_handle;
/* Look for a free AS with lock held */
for (i = 0; i < smmu->num_as; i++) {
as = &smmu->as[i];
if (as->pdir_page)
continue;
err = alloc_pdir(as);
if (!err)
goto found;
if (err != -EAGAIN)
break;
}
if (i == smmu->num_as)
dev_err(smmu->dev, "no free AS\n");
return ERR_PTR(err);
found:
spin_lock_irqsave(&smmu->lock, flags);
/* Update PDIR register */
smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
smmu_write(smmu,
SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA);
FLUSH_SMMU_REGS(smmu);
spin_unlock_irqrestore(&smmu->lock, flags);
debugfs_create_as(as);
dev_dbg(smmu->dev, "smmu_as@%p\n", as);
return as;
}
static void smmu_as_free_default(struct smmu_domain *dom,
unsigned long as_alloc_bitmap)
{
int idx;
for_each_set_bit(idx, &as_alloc_bitmap, MAX_AS_PER_DEV) {
free_pdir(dom->as[idx]);
dom->as[idx] = NULL;
}
}
static void debugfs_create_master(struct smmu_client *c)
{
int i;
for (i = 0; i < MAX_AS_PER_DEV; i++) {
char name[] = "as000";
char target[256];
struct smmu_as *as = c->domain->as[i];
struct dentry *dent;
if (!as)
continue;
if (!c->debugfs_root)
c->debugfs_root =
debugfs_create_dir(dev_name(c->dev),
as->smmu->masters_root);
sprintf(name, "as%03d", as->asid);
sprintf(target, "../../as%03d", as->asid);
debugfs_create_symlink(name, c->debugfs_root, target);
sprintf(target, "../masters/%s", dev_name(c->dev));
dent = debugfs_create_symlink(dev_name(c->dev), as->debugfs_root,
target);
c->as_link[i] = dent;
}
}
static int smmu_iommu_attach_dev(struct iommu_domain *domain,
struct device *dev)
{
struct smmu_domain *dom = to_smmu_domain(domain);
struct smmu_as *as;
struct smmu_device *smmu;
struct smmu_client *client, *c;
struct iommu_linear_map *area;
struct dma_iommu_mapping *dma_map;
u64 swgids;
int err = -ENOMEM;
int idx;
unsigned long as_bitmap[1];
unsigned long as_alloc_bitmap = 0;
client = tegra_smmu_find_client(smmu_handle, dev);
if (!client)
return -ENOMEM;
dma_map = to_dma_iommu_mapping(dev);
dma_map_to_as_bitmap(dma_map, as_bitmap);
for_each_set_bit(idx, as_bitmap, MAX_AS_PER_DEV) {
if (test_and_set_bit(idx, dom->bitmap))
continue;
as = smmu_as_alloc();
if (IS_ERR(as)) {
err = PTR_ERR(as);
goto release_as;
}
dom->as[idx] = as;
set_bit(idx, &as_alloc_bitmap);
dev_info(dev, "domain=%p allocates as[%d]=%p\n", dom, idx, as);
}
/* get the first valid asid */
idx = __ffs(dom->bitmap[0]);
as = dom->as[idx];
smmu = as->smmu;
if (iommu_dma_init_domain(domain,
domain->geometry.aperture_start,
domain->geometry.aperture_end -
domain->geometry.aperture_start, dev))
pr_err("iommu_dma_init_domain failed, %s\n",
dev_name(dev));
area = client->prop->area;
while (area && area->size) {
DEFINE_DMA_ATTRS(attrs);
size_t size = PAGE_ALIGN(area->size);
dma_set_attr(DMA_ATTR_SKIP_IOVA_GAP, attrs);
dma_set_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs);
err = dma_map_linear_attrs(dev, area->start, size, 0, attrs);
if (err == DMA_ERROR_CODE)
dev_err(dev, "Failed IOVA linear map %pad(%zx)\n",
&area->start, size);
else
dev_info(dev, "IOVA linear map %pad(%zx)\n",
&area->start, size);
area++;
}
client->domain = dom;
swgids = client->swgids;
swgids &= smmu_handle->swgids;
err = smmu_client_enable_hwgrp(client, swgids);
if (err)
goto err_hwgrp;
spin_lock(&as->client_lock);
list_for_each_entry(c, &as->client, list) {
if (c->dev == dev) {
dev_err(smmu->dev,
"%s is already attached\n", dev_name(c->dev));
err = -EINVAL;
goto err_client;
}
}
list_add(&client->list, &as->client);
spin_unlock(&as->client_lock);
dev_dbg(smmu->dev, "%s is attached\n", dev_name(dev));
debugfs_create_master(client);
return 0;
err_client:
smmu_client_disable_hwgrp(client);
spin_unlock(&as->client_lock);
err_hwgrp:
client->domain = NULL;
release_as:
smmu_as_free(dom, as_alloc_bitmap);
return err;
}
static void smmu_iommu_detach_dev(struct iommu_domain *domain,
struct device *dev)
{
struct smmu_as *as = domain_to_as(domain, -1);
struct smmu_device *smmu;
struct smmu_client *c;
struct dentry *temp, **as_link;
int i;
if (!as)
return;
smmu = as->smmu;
spin_lock(&as->client_lock);
list_for_each_entry(c, &as->client, list) {
if (c->dev == dev) {
temp = c->debugfs_root;
as_link = c->as_link;
c->debugfs_root = NULL;
list_del(&c->list);
smmu_client_disable_hwgrp(c);
dev_dbg(smmu->dev,
"%s is detached\n", dev_name(c->dev));
goto out;
}
}
dev_err(smmu->dev, "Couldn't find %s\n", dev_name(dev));
spin_unlock(&as->client_lock);
return;
out:
spin_unlock(&as->client_lock);
for (i = 0; i < MAX_AS_PER_DEV; i++)
debugfs_remove(as_link[i]);
debugfs_remove_recursive(temp);
}
static struct iommu_domain *smmu_iommu_domain_alloc(unsigned type)
{
struct smmu_device *smmu = smmu_handle;
struct smmu_domain *smmu_domain;
struct iommu_domain *domain;
/* BUG_ON(domain->priv); */
smmu_domain = devm_kzalloc(smmu->dev, sizeof(*smmu_domain), GFP_KERNEL);
if (!smmu_domain)
return NULL;
iommu_get_dma_cookie(&smmu_domain->domain);
domain = &smmu_domain->domain;
domain->geometry.aperture_start = smmu->iovmm_base;
domain->geometry.aperture_end = smmu->iovmm_base +
smmu->page_count * SMMU_PAGE_SIZE - 1;
domain->geometry.force_aperture = true;
domain->pgsize_bitmap = SMMU_IOMMU_PGSIZES;
return domain;
}
static void __smmu_domain_free(struct smmu_device *smmu, struct smmu_as *as)
{
if (as->pdir_page) {
spin_lock(&smmu->lock);
smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID);
smmu_write(smmu, SMMU_PTB_DATA_RESET_VAL, SMMU_PTB_DATA);
FLUSH_SMMU_REGS(smmu);
spin_unlock(&smmu->lock);
free_pdir(as);
}
return;
}
static void smmu_iommu_domain_free(struct iommu_domain *domain)
{
struct smmu_as *as = domain_to_as(domain, -1);
struct smmu_device *smmu;
unsigned long flags;
struct smmu_map_prop *prop;
/* find the smmu_map_prop containing this domain */
list_for_each_entry(prop, &smmu_handle->asprops, list) {
if (prop->map && (prop->map->domain == domain)) {
prop->map = NULL;
break;
}
}
if (!as)
return;
smmu = as->smmu;
iommu_put_dma_cookie(domain);
spin_lock_irqsave(&as->lock, flags);
debugfs_remove_recursive(as->debugfs_root);
smmu_domain_free(smmu, as);
if (!list_empty(&as->client)) {
struct smmu_client *c, *tmp_c;
list_for_each_entry_safe(c, tmp_c, &as->client, list) {
dev_err(smmu->dev,
"detaching %s because iommu domain is destroyed!\n",
dev_name(c->dev));
smmu_iommu_detach_dev(domain, c->dev);
}
}
spin_unlock_irqrestore(&as->lock, flags);
devm_kfree(smmu->dev, to_smmu_domain(domain));
dev_dbg(smmu->dev, "smmu_as@%p\n", as);
}
/*
* Traverse the PCI tree to find the root of the PCI tree. That's the device
* that should be used for finding the SMMU mapping.
*/
struct device *__get_pci_dev(struct device *dev)
{
struct pci_bus *bus;
if (!dev_is_pci(dev))
return dev;
bus = to_pci_dev(dev)->bus;
while (!pci_is_root_bus(bus))
bus = bus->parent;
return bus->bridge->parent;
}
static int __smmu_iommu_add_device(struct device *dev, u64 swgids)
{
struct dma_iommu_mapping *map;
int err;
/*
* If the device is a PCI device we need to use the root of the PCI
* tree for looking up the SMMU mapping.
*/
map = tegra_smmu_of_get_mapping(__get_pci_dev(dev), swgids,
&smmu_handle->asprops);
if (!map) {
dev_err(dev, "map creation failed!!!\n");
return -ENOMEM;
}
err = arm_iommu_attach_device(dev, map);
if (err) {
dev_err(dev, "Failed to attach %s\n", dev_name(dev));
arm_iommu_release_mapping(map);
return err;
}
dev_dbg(dev, "Attached %s to map %p\n", dev_name(dev), map);
return 0;
}
static int smmu_iommu_add_device(struct device *dev)
{
int err;
u64 swgids;
struct iommu_group *group;
if (!smmu_handle) {
dev_err(dev, "No map available yet!!!\n");
return -ENODEV;
}
swgids = tegra_smmu_get_swgids(dev);
if (swgids_is_error(swgids))
return -ENODEV;
group = iommu_group_alloc();
if (IS_ERR(group)) {
dev_err(dev, "Failed to allocate IOMMU group\n");
return PTR_ERR(group);
}
err = iommu_group_add_device(group, dev);
iommu_group_put(group);
if (err)
goto out_put_group;
err = __smmu_iommu_add_device(dev, swgids);
if (err)
goto out_put_group;
return 0;
out_put_group:
dev_err(dev, "%s failed\n", __func__);
iommu_group_put(group);
return err;
}
static void smmu_iommu_remove_device(struct device *dev)
{
dev_dbg(dev, "Detaching %s from map %p\n", dev_name(dev),
to_dma_iommu_mapping(dev));
arm_iommu_detach_device(dev);
iommu_group_remove_device(dev);
}
static struct iommu_ops smmu_iommu_ops_default = {
.capable = smmu_iommu_capable,
.domain_alloc = smmu_iommu_domain_alloc,
.domain_free = smmu_iommu_domain_free,
.attach_dev = smmu_iommu_attach_dev,
.detach_dev = smmu_iommu_detach_dev,
.map = smmu_iommu_map,
.map_sg = default_iommu_map_sg,
.unmap = smmu_iommu_unmap,
.iova_to_phys = smmu_iommu_iova_to_phys,
.add_device = smmu_iommu_add_device,
.remove_device = smmu_iommu_remove_device,
.pgsize_bitmap = SMMU_IOMMU_PGSIZES,
};
/* Should be in the order of enum */
static const char * const smmu_debugfs_mc[] = { "mc", };
static const char * const smmu_debugfs_cache[] = { "tlb", "ptc", };
static void smmu_stats_update(struct smmu_debugfs_info *info)
{
int i;
struct smmu_device *smmu = info->smmu;
const char * const stats[] = { "hit", "miss", };
for (i = 0; i < ARRAY_SIZE(stats); i++) {
u32 cur, lo, hi;
size_t offs;
lo = info->val[i] & 0xffffffff;
hi = info->val[i] >> 32;
offs = SMMU_STATS_CACHE_COUNT(info->mc, info->cache, i);
cur = smmu_read(smmu, offs);
if (cur < lo) {
hi++;
dev_info(smmu->dev, "%s is overwrapping\n", stats[i]);
}
lo = cur;
info->val[i] = (u64)hi << 32 | lo;
}
}
static void smmu_stats_timer_fn(unsigned long data)
{
struct smmu_debugfs_info *info = (struct smmu_debugfs_info *)data;
smmu_stats_update(info);
mod_timer(&info->stats_timer, jiffies + msecs_to_jiffies(100));
}
static ssize_t smmu_debugfs_stats_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *pos)
{
struct smmu_debugfs_info *info;
struct smmu_device *smmu;
int i;
enum {
_OFF = 0,
_ON,
_RESET,
};
const char * const command[] = {
[_OFF] = "off",
[_ON] = "on",
[_RESET] = "reset",
};
char str[] = "reset";
u32 val;
size_t offs;
count = min_t(size_t, count, sizeof(str));
if (copy_from_user(str, buffer, count))
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(command); i++)
if (strncmp(str, command[i],
strlen(command[i])) == 0)
break;
if (i == ARRAY_SIZE(command))
return -EINVAL;
info = file_inode(file)->i_private;
smmu = info->smmu;
offs = SMMU_CACHE_CONFIG(info->cache);
val = smmu_read(smmu, offs);
switch (i) {
case _OFF:
val &= ~SMMU_CACHE_CONFIG_STATS_ENABLE;
val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
smmu_write(smmu, val, offs);
del_timer_sync(&info->stats_timer);
break;
case _ON:
val |= SMMU_CACHE_CONFIG_STATS_ENABLE;
val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
info->stats_timer.data = (unsigned long)info;
mod_timer(&info->stats_timer, jiffies + msecs_to_jiffies(100));
smmu_write(smmu, val, offs);
break;
case _RESET:
val |= SMMU_CACHE_CONFIG_STATS_TEST;
smmu_write(smmu, val, offs);
val &= ~SMMU_CACHE_CONFIG_STATS_TEST;
smmu_write(smmu, val, offs);
memset(info->val, 0, sizeof(info->val));
break;
default:
BUG();
break;
}
dev_dbg(smmu->dev, "%s() %08x, %08x @%08llx\n", __func__,
val, smmu_read(smmu, offs), (u64)offs);
return count;
}
static int smmu_debugfs_stats_show(struct seq_file *s, void *v)
{
struct smmu_debugfs_info *info = s->private;
smmu_stats_update(info);
seq_printf(s, "hit:%016llx miss:%016llx\n", info->val[0], info->val[1]);
return 0;
}
static int smmu_debugfs_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, smmu_debugfs_stats_show, inode->i_private);
}
static const struct file_operations smmu_debugfs_stats_fops_default = {
.open = smmu_debugfs_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = smmu_debugfs_stats_write,
};
static void smmu_debugfs_delete(struct smmu_device *smmu)
{
debugfs_remove_recursive(smmu->debugfs_root);
kfree(smmu->debugfs_info);
}
struct smmu_addr_marker {
u32 start_address;
const char *name;
};
#define SZ_3G (SZ_1G + SZ_2G)
static struct smmu_addr_marker address_markers[] = {
{ 0, "0x0000:0000", },
{ SZ_1G, "0x4000:0000", },
{ SZ_2G, "0x8000:0000", },
{ SZ_3G, "0xc000:0000", },
{ -1, NULL, },
};
struct smmu_pg_state {
struct seq_file *seq;
const struct smmu_addr_marker *marker;
u32 start_address;
unsigned level;
u32 current_prot;
};
static void smmu_dump_attr(struct smmu_pg_state *st)
{
int i;
const char prot_set[] = "RW-";
const char prot_clr[] = "--S";
for (i = 0; i < ARRAY_SIZE(prot_set); i++) {
if (st->current_prot & BIT(31 - i))
seq_printf(st->seq, "%c", prot_set[i]);
else
seq_printf(st->seq, "%c", prot_clr[i]);
}
}
static void smmu_note_page(struct smmu_pg_state *st, u32 addr, int level,
u32 val)
{
static const char units[] = "KMGTPE";
u32 prot = val & _MASK_ATTR;
if (!st->level) {
st->level = level;
st->current_prot = prot;
seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
} else if (prot != st->current_prot || level != st->level ||
addr >= st->marker[1].start_address) {
const char *unit = units;
unsigned long delta;
if (st->current_prot) {
seq_printf(st->seq, "0x%08x-0x%08x ",
st->start_address, addr);
delta = (addr - st->start_address) >> 10;
while (!(delta & 1023) && unit[1]) {
delta >>= 10;
unit++;
}
seq_printf(st->seq, "%9lu%c ", delta, *unit);
smmu_dump_attr(st);
seq_puts(st->seq, "\n");
}
if (addr >= st->marker[1].start_address) {
st->marker++;
seq_printf(st->seq, "---[ %s ]---\n", st->marker->name);
}
st->start_address = addr;
st->current_prot = prot;
st->level = level;
}
}
static void smmu_walk_pte(struct smmu_pg_state *st, u32 *pgd, u32 start)
{
int i;
u32 *pte = page_address(SMMU_EX_PTBL_PAGE(*pgd));
for (i = 0; i < PTRS_PER_PTE; i++, pte++)
smmu_note_page(st, start + i * PAGE_SIZE, 2, *pte);
}
static void smmu_walk_pgd(struct seq_file *m, struct smmu_as *as)
{
int i;
u32 *pgd;
unsigned long flags;
struct smmu_pg_state st = {
.seq = m,
.marker = address_markers,
};
if (!pfn_valid(page_to_pfn(as->pdir_page)))
return;
spin_lock_irqsave(&as->lock, flags);
pgd = page_address(as->pdir_page);
for (i = 0; i < SMMU_PDIR_COUNT; i++, pgd++) {
u32 addr = i * SMMU_PAGE_SIZE * SMMU_PTBL_COUNT;
if (*pgd & _PDE_NEXT)
smmu_walk_pte(&st, pgd, addr);
else
smmu_note_page(&st, addr, 1, *pgd);
}
smmu_note_page(&st, 0, 0, 0);
spin_unlock_irqrestore(&as->lock, flags);
}
static int smmu_ptdump_show(struct seq_file *m, void *v)
{
smmu_walk_pgd(m, m->private);
return 0;
}
static int smmu_ptdump_open(struct inode *inode, struct file *file)
{
return single_open(file, smmu_ptdump_show, inode->i_private);
}
static const struct file_operations smmu_ptdump_fops = {
.open = smmu_ptdump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void smmu_dump_pagetable(int swgid, dma_addr_t fault)
{
struct rb_node *n;
static char str[SZ_512] = "No valid page table\n";
for (n = rb_first(&smmu_handle->clients); n; n = rb_next(n)) {
size_t bytes;
phys_addr_t pa;
u32 npte;
unsigned long flags;
struct smmu_client *c =
container_of(n, struct smmu_client, node);
struct smmu_as *as;
if (!(c->swgids & (1ULL << swgid)))
continue;
as = domain_to_as(&c->domain->domain, fault);
if (!as)
continue;
spin_lock_irqsave(&as->lock, flags);
bytes = __smmu_iommu_iova_to_phys(as, fault, &pa, &npte);
spin_unlock_irqrestore(&as->lock, flags);
snprintf(str, sizeof(str),
"fault_address=%pa pa=%pa bytes=%zx #pte=%d in L2\n",
&fault, &pa, bytes, npte);
break;
}
trace_printk(str);
pr_err("%s", str);
}
static dma_addr_t tegra_smmu_inquired_iova;
static struct smmu_as *tegra_smmu_inquired_as;
static phys_addr_t tegra_smmu_inquired_phys;
static void smmu_dump_phys_page(struct seq_file *m, phys_addr_t phys)
{
ulong addr, base;
phys_addr_t paddr;
ulong offset;
if (!phys || (phys == ~0))
return;
offset = round_down(phys & ~PAGE_MASK, 16);
base = (ulong) kmap(phys_to_page(phys));
addr = round_down(base + (phys & ~PAGE_MASK), 16);
paddr = (phys & PAGE_MASK) + (addr - base);
for (; addr < base + PAGE_SIZE; addr += 16, paddr += 16) {
u32 *ptr = (u32 *)addr;
char buffer[127];
snprintf(buffer, 127,
"%pa: 0x%08x 0x%08x 0x%08x 0x%08x",
&paddr, *ptr, *(ptr + 1), *(ptr + 2), *(ptr + 3));
if (m)
seq_printf(m, "\n%s", buffer);
else
pr_debug("\n%s", buffer);
}
kunmap(phys_to_page(phys));
if (m)
seq_printf(m, "\n");
else
pr_debug("\n");
}
static int smmu_iova2pa_show(struct seq_file *m, void *v)
{
struct smmu_as *as = m->private;
unsigned long flags;
size_t tegra_smmu_inquired_bytes;
int tegra_smmu_inquired_npte;
if (tegra_smmu_inquired_as != as)
return -EINVAL;
spin_lock_irqsave(&as->lock, flags);
tegra_smmu_inquired_bytes =
__smmu_iommu_iova_to_phys(as, tegra_smmu_inquired_iova,
&tegra_smmu_inquired_phys,
&tegra_smmu_inquired_npte);
spin_unlock_irqrestore(&as->lock, flags);
seq_printf(m, "iova=%pa pa=%pa bytes=%zx npte=%d\n",
&tegra_smmu_inquired_iova,
&tegra_smmu_inquired_phys,
tegra_smmu_inquired_bytes,
tegra_smmu_inquired_npte);
return 0;
}
static int smmu_iova2pa_open(struct inode *inode, struct file *file)
{
return single_open(file, smmu_iova2pa_show, inode->i_private);
}
static ssize_t smmu_debugfs_iova2pa_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *pos)
{
int ret;
struct smmu_as *as = file_inode(file)->i_private;
char str[] = "0123456789abcdef";
if (count > strlen(str))
return -EINVAL;
if (copy_from_user(str, buffer, count))
return -EINVAL;
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
/* str can't be greater than 16 digit number */
ret = sscanf(str, "%16Lx", &tegra_smmu_inquired_iova);
#else
/* dma_addr_t is 32-bit => 10 digits at max */
ret = sscanf(str, "%10x", (u32 *)&tegra_smmu_inquired_iova);
#endif
if (ret != 1)
return -EINVAL;
tegra_smmu_inquired_as = as;
pr_debug("requested iova=%pa in as%03d\n", &tegra_smmu_inquired_iova,
as->asid);
return count;
}
static const struct file_operations smmu_iova2pa_fops = {
.open = smmu_iova2pa_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = smmu_debugfs_iova2pa_write,
};
static int smmu_iovadump_show(struct seq_file *m, void *v)
{
int ret = smmu_iova2pa_show(m, v);
if (ret)
return ret;
/* pass NULL if you want to print to console */
smmu_dump_phys_page(m, tegra_smmu_inquired_phys);
return 0;
}
static int smmu_iovadump_open(struct inode *inode, struct file *file)
{
return single_open(file, smmu_iovadump_show, inode->i_private);
}
static const struct file_operations smmu_iovadump_fops = {
.open = smmu_iovadump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = smmu_debugfs_iova2pa_write,
};
static void smmu_debugfs_create(struct smmu_device *smmu)
{
int i;
size_t bytes;
struct dentry *root;
bytes = ARRAY_SIZE(smmu_debugfs_mc) * ARRAY_SIZE(smmu_debugfs_cache) *
sizeof(*smmu->debugfs_info);
smmu->debugfs_info = kzalloc(bytes, GFP_KERNEL);
if (!smmu->debugfs_info)
return;
root = debugfs_create_dir(dev_name(smmu->dev), NULL);
if (!root)
goto err_out;
smmu->debugfs_root = root;
root = debugfs_create_dir("masters", smmu->debugfs_root);
if (!root)
goto err_out;
smmu->masters_root = root;
for (i = 0; i < ARRAY_SIZE(smmu_debugfs_mc); i++) {
int j;
struct dentry *mc;
mc = debugfs_create_dir(smmu_debugfs_mc[i], root);
if (!mc)
goto err_out;
for (j = 0; j < ARRAY_SIZE(smmu_debugfs_cache); j++) {
struct dentry *cache;
struct smmu_debugfs_info *info;
info = smmu->debugfs_info;
info += i * ARRAY_SIZE(smmu_debugfs_mc) + j;
info->smmu = smmu;
info->mc = i;
info->cache = j;
cache = debugfs_create_file(smmu_debugfs_cache[j],
S_IWUSR | S_IRUSR, mc,
(void *)info,
smmu_debugfs_stats_fops);
if (!cache)
goto err_out;
setup_timer(&info->stats_timer, smmu_stats_timer_fn, 0);
}
}
debugfs_create_size_t("flush_all_threshold_map_pages", S_IWUSR | S_IRUSR,
root, &smmu_flush_all_th_map_pages);
debugfs_create_size_t("flush_all_threshold_unmap_pages", S_IWUSR | S_IRUSR,
root, &smmu_flush_all_th_unmap_pages);
return;
err_out:
smmu_debugfs_delete(smmu);
}
static int tegra_smmu_suspend_default(struct device *dev)
{
return 0;
}
int tegra_smmu_suspend(struct device *dev)
{
return __tegra_smmu_suspend(dev);
}
EXPORT_SYMBOL(tegra_smmu_suspend);
int tegra_smmu_save(void)
{
return tegra_smmu_suspend(save_smmu_device);
}
static int tegra_smmu_resume_default(struct device *dev)
{
struct smmu_device *smmu = dev_get_drvdata(dev);
unsigned long flags;
spin_lock_irqsave(&smmu->lock, flags);
smmu_setup_regs(smmu);
spin_unlock_irqrestore(&smmu->lock, flags);
return 0;
}
int tegra_smmu_resume(struct device *dev)
{
return __tegra_smmu_resume(dev);
}
EXPORT_SYMBOL(tegra_smmu_resume);
int tegra_smmu_restore(void)
{
return tegra_smmu_resume(save_smmu_device);
}
static int tegra_smmu_probe_default(struct platform_device *pdev,
struct smmu_device *smmu)
{
int err = -EINVAL;
struct resource *regs, *regs2;
struct device *dev = &pdev->dev;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!regs || !regs2) {
dev_err(dev, "No SMMU resources\n");
goto __exit_probe;
}
smmu->regs = devm_ioremap(dev, regs->start, resource_size(regs));
smmu->regs_ahbarb = devm_ioremap(dev, regs2->start,
resource_size(regs2));
if (!smmu->regs || !smmu->regs_ahbarb) {
err = -ENXIO;
goto __exit_probe;
}
if (of_property_read_u64(dev->of_node, "swgid-mask", &smmu->swgids))
goto __exit_probe;
if (of_property_read_u32(dev->of_node, "ptc-cache-size",
&smmu->ptc_cache_line))
smmu->ptc_cache_line = 64;
smmu_setup_regs(smmu);
return 0;
__exit_probe:
return err;
}
static int tegra_smmu_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct of_device_id *match;
struct tegra_smmu_chip_data *chip_data = NULL;
struct smmu_device *smmu;
int num_as, count, i;
size_t size, bytes;
dma_addr_t base;
int err = 0;
if (smmu_handle) {
dev_info(dev, "skip %s", __func__);
return -ENODEV;
}
if (PAGE_SHIFT != SMMU_PAGE_SHIFT) {
err = -EINVAL;
goto exit_probe;
}
save_smmu_device = dev;
match = of_match_node(tegra_smmu_of_match, dev->of_node);
if (!match)
goto exit_probe;
if (!match->data) {
chip_data = devm_kzalloc(dev,
sizeof(*chip_data), GFP_KERNEL);
if (!chip_data)
goto exit_probe;
chip_data->num_asids = 128;
} else
chip_data = (struct tegra_smmu_chip_data *)match->data;
if (of_get_dma_window(dev->of_node, NULL, 0, NULL, &base, &size))
goto exit_probe;
size >>= SMMU_PAGE_SHIFT;
if (of_property_read_u32(dev->of_node, "#asids", &num_as))
goto exit_probe;
if (num_as > chip_data->num_asids) {
dev_err(dev, "invalid number of asid\n");
goto exit_probe;
}
err = -ENOMEM;
bytes = sizeof(*smmu) + num_as * sizeof(*smmu->as);
smmu = devm_kzalloc(dev, bytes, GFP_KERNEL);
if (!smmu)
goto exit_probe;
smmu->dev = dev;
INIT_LIST_HEAD(&smmu->asprops);
count = tegra_smmu_of_register_asprops(smmu->dev, &smmu->asprops);
if (!count) {
dev_err(dev, "invalid domains property\n");
err = -EINVAL;
goto exit_probe;
}
smmu->chip_data = chip_data;
smmu->num_as = num_as;
smmu->clients = RB_ROOT;
smmu->iovmm_base = base;
smmu->page_count = size;
for (i = 0; i < smmu->num_as; i++) {
struct smmu_as *as = &smmu->as[i];
as->smmu = smmu;
as->asid = i;
as->pdir_attr = _PDIR_ATTR;
as->pde_attr = _PDE_ATTR;
as->pte_attr = _PTE_ATTR;
spin_lock_init(&as->lock);
spin_lock_init(&as->client_lock);
INIT_LIST_HEAD(&as->client);
}
spin_lock_init(&smmu->lock);
spin_lock_init(&smmu->ptc_lock);
#ifdef CONFIG_TEGRA_IOMMU_SMMU_HV
if (is_tegra_hypervisor_mode() &&
!strcmp(match->compatible, "nvidia,tegra124-smmu-hv"))
__tegra_smmu_probe = tegra_smmu_probe_hv;
#endif
err = __tegra_smmu_probe(pdev, smmu);
if (err)
goto fail_cleanup;
platform_set_drvdata(pdev, smmu);
smmu_debugfs_create(smmu);
BUG_ON(cmpxchg(&smmu_handle, NULL, smmu));
bus_set_iommu(&platform_bus_type, smmu_iommu_ops);
#ifdef CONFIG_PCI
bus_set_iommu(&pci_bus_type, smmu_iommu_ops);
#endif
dev_info(dev, "Loaded Tegra IOMMU driver\n");
return 0;
fail_cleanup:
devm_kfree(dev, smmu);
exit_probe:
dev_err(dev, "tegra smmu probe failed, e=%d", err);
return err;
}
static int tegra_smmu_remove(struct platform_device *pdev)
{
struct smmu_device *smmu = platform_get_drvdata(pdev);
int i;
smmu_debugfs_delete(smmu);
smmu_write(smmu, SMMU_CONFIG_DISABLE, SMMU_CONFIG);
for (i = 0; i < smmu->num_as; i++)
free_pdir(&smmu->as[i]);
smmu_handle = NULL;
return 0;
}
static const struct dev_pm_ops tegra_smmu_pm_ops = {
.suspend_noirq = tegra_smmu_suspend,
.resume_noirq = tegra_smmu_resume,
};
static struct of_device_id tegra_smmu_of_match[] = {
{ .compatible = "nvidia,tegra210-smmu", },
{ .compatible = "nvidia,tegra132-smmu", },
{ .compatible = "nvidia,tegra124-smmu", },
{ .compatible = "nvidia,tegra124-smmu-hv", },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_smmu_of_match);
static struct platform_driver tegra_smmu_driver = {
.probe = tegra_smmu_probe,
.remove = tegra_smmu_remove,
.driver = {
.owner = THIS_MODULE,
.name = "tegra_smmu",
.pm = &tegra_smmu_pm_ops,
.of_match_table = tegra_smmu_of_match,
},
};
int (*__smmu_client_set_hwgrp)(struct smmu_client *c, u64 map, int on) = __smmu_client_set_hwgrp_default;
struct smmu_as *(*smmu_as_alloc)(void) = smmu_as_alloc_default;
void (*smmu_as_free)(struct smmu_domain *dom, unsigned long as_alloc_bitmap) = smmu_as_free_default;
void (*smmu_domain_free)(struct smmu_device *smmu, struct smmu_as *as)
= __smmu_domain_free;
int (*__smmu_iommu_map_pfn)(struct smmu_as *as, dma_addr_t iova, unsigned long pfn, unsigned long prot) = __smmu_iommu_map_pfn_default;
int (*__smmu_iommu_map_largepage)(struct smmu_as *as, dma_addr_t iova, phys_addr_t pa, unsigned long prot) = __smmu_iommu_map_largepage_default;
size_t (*__smmu_iommu_unmap)(struct smmu_as *as, dma_addr_t iova, size_t bytes) = __smmu_iommu_unmap_default;
size_t (*__smmu_iommu_map_sg)(struct iommu_domain *domain, unsigned long iova, struct scatterlist *sgl, unsigned int npages, unsigned long prot) = default_iommu_map_sg;
int (*__tegra_smmu_suspend)(struct device *dev) = tegra_smmu_suspend_default;
int (*__tegra_smmu_resume)(struct device *dev) = tegra_smmu_resume_default;
int (*__tegra_smmu_probe)(struct platform_device *pdev, struct smmu_device *smmu) = tegra_smmu_probe_default;
void (*flush_ptc_and_tlb)(struct smmu_device *smmu, struct smmu_as *as, dma_addr_t iova, u32 *pte, struct page *page, int is_pde) = flush_ptc_and_tlb_default;
void (*flush_ptc_and_tlb_range)(struct smmu_device *smmu, struct smmu_as *as, dma_addr_t iova, u32 *pte, struct page *page, size_t count) = flush_ptc_and_tlb_range_default;
void (*flush_ptc_and_tlb_as)(struct smmu_as *as, dma_addr_t start, dma_addr_t end) = flush_ptc_and_tlb_as_default;
void (*free_pdir)(struct smmu_as *as) = free_pdir_default;
struct iommu_ops *smmu_iommu_ops = &smmu_iommu_ops_default;
const struct file_operations *smmu_debugfs_stats_fops = &smmu_debugfs_stats_fops_default;
void tegra_smmu_map_misc_device(struct device *dev)
{
smmu_iommu_add_device(dev);
}
EXPORT_SYMBOL(tegra_smmu_map_misc_device);
void tegra_smmu_unmap_misc_device(struct device *dev)
{
smmu_iommu_remove_device(dev);
}
EXPORT_SYMBOL(tegra_smmu_unmap_misc_device);
static bool init_done;
static int tegra_smmu_init(void)
{
int err;
err = platform_driver_register(&tegra_smmu_driver);
if (err)
return err;
init_done = true;
return 0;
}
static int tegra_smmu_remove_map(struct device *dev, void *data)
{
struct dma_iommu_mapping *map = to_dma_iommu_mapping(dev);
if (map)
arm_iommu_release_mapping(map);
return 0;
}
static void __exit tegra_smmu_exit(void)
{
if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
bus_for_each_dev(&platform_bus_type, NULL, NULL,
tegra_smmu_remove_map);
}
platform_driver_unregister(&tegra_smmu_driver);
}
module_exit(tegra_smmu_exit);
static int __init tegra_smmu_of_setup(struct device_node *np)
{
struct platform_device *pdev;
if (!init_done)
tegra_smmu_init();
pdev = of_platform_device_create(np, NULL, platform_bus_type.dev_root);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
of_iommu_set_ops(np, (struct iommu_ops *)&smmu_iommu_ops);
return 0;
}
IOMMU_OF_DECLARE(tegra_smmu_of, "nvidia,tegra210-smmu", tegra_smmu_of_setup);
MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra SoC");
MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
MODULE_LICENSE("GPL v2");
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