linux-stable/drivers/iommu/qcom_iommu.c
Thomas Gleixner caab277b1d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 503 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Enrico Weigelt <info@metux.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:07 +02:00

927 lines
23 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* IOMMU API for QCOM secure IOMMUs. Somewhat based on arm-smmu.c
*
* Copyright (C) 2013 ARM Limited
* Copyright (C) 2017 Red Hat
*/
#include <linux/atomic.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/io-pgtable.h>
#include <linux/iommu.h>
#include <linux/iopoll.h>
#include <linux/kconfig.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_iommu.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/qcom_scm.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include "arm-smmu-regs.h"
#define SMMU_INTR_SEL_NS 0x2000
struct qcom_iommu_ctx;
struct qcom_iommu_dev {
/* IOMMU core code handle */
struct iommu_device iommu;
struct device *dev;
struct clk *iface_clk;
struct clk *bus_clk;
void __iomem *local_base;
u32 sec_id;
u8 num_ctxs;
struct qcom_iommu_ctx *ctxs[0]; /* indexed by asid-1 */
};
struct qcom_iommu_ctx {
struct device *dev;
void __iomem *base;
bool secure_init;
u8 asid; /* asid and ctx bank # are 1:1 */
struct iommu_domain *domain;
};
struct qcom_iommu_domain {
struct io_pgtable_ops *pgtbl_ops;
spinlock_t pgtbl_lock;
struct mutex init_mutex; /* Protects iommu pointer */
struct iommu_domain domain;
struct qcom_iommu_dev *iommu;
};
static struct qcom_iommu_domain *to_qcom_iommu_domain(struct iommu_domain *dom)
{
return container_of(dom, struct qcom_iommu_domain, domain);
}
static const struct iommu_ops qcom_iommu_ops;
static struct qcom_iommu_dev * to_iommu(struct iommu_fwspec *fwspec)
{
if (!fwspec || fwspec->ops != &qcom_iommu_ops)
return NULL;
return fwspec->iommu_priv;
}
static struct qcom_iommu_ctx * to_ctx(struct iommu_fwspec *fwspec, unsigned asid)
{
struct qcom_iommu_dev *qcom_iommu = to_iommu(fwspec);
if (!qcom_iommu)
return NULL;
return qcom_iommu->ctxs[asid - 1];
}
static inline void
iommu_writel(struct qcom_iommu_ctx *ctx, unsigned reg, u32 val)
{
writel_relaxed(val, ctx->base + reg);
}
static inline void
iommu_writeq(struct qcom_iommu_ctx *ctx, unsigned reg, u64 val)
{
writeq_relaxed(val, ctx->base + reg);
}
static inline u32
iommu_readl(struct qcom_iommu_ctx *ctx, unsigned reg)
{
return readl_relaxed(ctx->base + reg);
}
static inline u64
iommu_readq(struct qcom_iommu_ctx *ctx, unsigned reg)
{
return readq_relaxed(ctx->base + reg);
}
static void qcom_iommu_tlb_sync(void *cookie)
{
struct iommu_fwspec *fwspec = cookie;
unsigned i;
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
unsigned int val, ret;
iommu_writel(ctx, ARM_SMMU_CB_TLBSYNC, 0);
ret = readl_poll_timeout(ctx->base + ARM_SMMU_CB_TLBSTATUS, val,
(val & 0x1) == 0, 0, 5000000);
if (ret)
dev_err(ctx->dev, "timeout waiting for TLB SYNC\n");
}
}
static void qcom_iommu_tlb_inv_context(void *cookie)
{
struct iommu_fwspec *fwspec = cookie;
unsigned i;
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
iommu_writel(ctx, ARM_SMMU_CB_S1_TLBIASID, ctx->asid);
}
qcom_iommu_tlb_sync(cookie);
}
static void qcom_iommu_tlb_inv_range_nosync(unsigned long iova, size_t size,
size_t granule, bool leaf, void *cookie)
{
struct iommu_fwspec *fwspec = cookie;
unsigned i, reg;
reg = leaf ? ARM_SMMU_CB_S1_TLBIVAL : ARM_SMMU_CB_S1_TLBIVA;
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
size_t s = size;
iova &= ~12UL;
iova |= ctx->asid;
do {
iommu_writel(ctx, reg, iova);
iova += granule;
} while (s -= granule);
}
}
static const struct iommu_gather_ops qcom_gather_ops = {
.tlb_flush_all = qcom_iommu_tlb_inv_context,
.tlb_add_flush = qcom_iommu_tlb_inv_range_nosync,
.tlb_sync = qcom_iommu_tlb_sync,
};
static irqreturn_t qcom_iommu_fault(int irq, void *dev)
{
struct qcom_iommu_ctx *ctx = dev;
u32 fsr, fsynr;
u64 iova;
fsr = iommu_readl(ctx, ARM_SMMU_CB_FSR);
if (!(fsr & FSR_FAULT))
return IRQ_NONE;
fsynr = iommu_readl(ctx, ARM_SMMU_CB_FSYNR0);
iova = iommu_readq(ctx, ARM_SMMU_CB_FAR);
if (!report_iommu_fault(ctx->domain, ctx->dev, iova, 0)) {
dev_err_ratelimited(ctx->dev,
"Unhandled context fault: fsr=0x%x, "
"iova=0x%016llx, fsynr=0x%x, cb=%d\n",
fsr, iova, fsynr, ctx->asid);
}
iommu_writel(ctx, ARM_SMMU_CB_FSR, fsr);
iommu_writel(ctx, ARM_SMMU_CB_RESUME, RESUME_TERMINATE);
return IRQ_HANDLED;
}
static int qcom_iommu_init_domain(struct iommu_domain *domain,
struct qcom_iommu_dev *qcom_iommu,
struct iommu_fwspec *fwspec)
{
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
struct io_pgtable_ops *pgtbl_ops;
struct io_pgtable_cfg pgtbl_cfg;
int i, ret = 0;
u32 reg;
mutex_lock(&qcom_domain->init_mutex);
if (qcom_domain->iommu)
goto out_unlock;
pgtbl_cfg = (struct io_pgtable_cfg) {
.pgsize_bitmap = qcom_iommu_ops.pgsize_bitmap,
.ias = 32,
.oas = 40,
.tlb = &qcom_gather_ops,
.iommu_dev = qcom_iommu->dev,
};
qcom_domain->iommu = qcom_iommu;
pgtbl_ops = alloc_io_pgtable_ops(ARM_32_LPAE_S1, &pgtbl_cfg, fwspec);
if (!pgtbl_ops) {
dev_err(qcom_iommu->dev, "failed to allocate pagetable ops\n");
ret = -ENOMEM;
goto out_clear_iommu;
}
/* Update the domain's page sizes to reflect the page table format */
domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap;
domain->geometry.aperture_end = (1ULL << pgtbl_cfg.ias) - 1;
domain->geometry.force_aperture = true;
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
if (!ctx->secure_init) {
ret = qcom_scm_restore_sec_cfg(qcom_iommu->sec_id, ctx->asid);
if (ret) {
dev_err(qcom_iommu->dev, "secure init failed: %d\n", ret);
goto out_clear_iommu;
}
ctx->secure_init = true;
}
/* TTBRs */
iommu_writeq(ctx, ARM_SMMU_CB_TTBR0,
pgtbl_cfg.arm_lpae_s1_cfg.ttbr[0] |
((u64)ctx->asid << TTBRn_ASID_SHIFT));
iommu_writeq(ctx, ARM_SMMU_CB_TTBR1,
pgtbl_cfg.arm_lpae_s1_cfg.ttbr[1] |
((u64)ctx->asid << TTBRn_ASID_SHIFT));
/* TTBCR */
iommu_writel(ctx, ARM_SMMU_CB_TTBCR2,
(pgtbl_cfg.arm_lpae_s1_cfg.tcr >> 32) |
TTBCR2_SEP_UPSTREAM);
iommu_writel(ctx, ARM_SMMU_CB_TTBCR,
pgtbl_cfg.arm_lpae_s1_cfg.tcr);
/* MAIRs (stage-1 only) */
iommu_writel(ctx, ARM_SMMU_CB_S1_MAIR0,
pgtbl_cfg.arm_lpae_s1_cfg.mair[0]);
iommu_writel(ctx, ARM_SMMU_CB_S1_MAIR1,
pgtbl_cfg.arm_lpae_s1_cfg.mair[1]);
/* SCTLR */
reg = SCTLR_CFIE | SCTLR_CFRE | SCTLR_AFE | SCTLR_TRE |
SCTLR_M | SCTLR_S1_ASIDPNE | SCTLR_CFCFG;
if (IS_ENABLED(CONFIG_BIG_ENDIAN))
reg |= SCTLR_E;
iommu_writel(ctx, ARM_SMMU_CB_SCTLR, reg);
ctx->domain = domain;
}
mutex_unlock(&qcom_domain->init_mutex);
/* Publish page table ops for map/unmap */
qcom_domain->pgtbl_ops = pgtbl_ops;
return 0;
out_clear_iommu:
qcom_domain->iommu = NULL;
out_unlock:
mutex_unlock(&qcom_domain->init_mutex);
return ret;
}
static struct iommu_domain *qcom_iommu_domain_alloc(unsigned type)
{
struct qcom_iommu_domain *qcom_domain;
if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
return NULL;
/*
* Allocate the domain and initialise some of its data structures.
* We can't really do anything meaningful until we've added a
* master.
*/
qcom_domain = kzalloc(sizeof(*qcom_domain), GFP_KERNEL);
if (!qcom_domain)
return NULL;
if (type == IOMMU_DOMAIN_DMA &&
iommu_get_dma_cookie(&qcom_domain->domain)) {
kfree(qcom_domain);
return NULL;
}
mutex_init(&qcom_domain->init_mutex);
spin_lock_init(&qcom_domain->pgtbl_lock);
return &qcom_domain->domain;
}
static void qcom_iommu_domain_free(struct iommu_domain *domain)
{
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
if (WARN_ON(qcom_domain->iommu)) /* forgot to detach? */
return;
iommu_put_dma_cookie(domain);
/* NOTE: unmap can be called after client device is powered off,
* for example, with GPUs or anything involving dma-buf. So we
* cannot rely on the device_link. Make sure the IOMMU is on to
* avoid unclocked accesses in the TLB inv path:
*/
pm_runtime_get_sync(qcom_domain->iommu->dev);
free_io_pgtable_ops(qcom_domain->pgtbl_ops);
pm_runtime_put_sync(qcom_domain->iommu->dev);
kfree(qcom_domain);
}
static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct qcom_iommu_dev *qcom_iommu = to_iommu(fwspec);
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
int ret;
if (!qcom_iommu) {
dev_err(dev, "cannot attach to IOMMU, is it on the same bus?\n");
return -ENXIO;
}
/* Ensure that the domain is finalized */
pm_runtime_get_sync(qcom_iommu->dev);
ret = qcom_iommu_init_domain(domain, qcom_iommu, fwspec);
pm_runtime_put_sync(qcom_iommu->dev);
if (ret < 0)
return ret;
/*
* Sanity check the domain. We don't support domains across
* different IOMMUs.
*/
if (qcom_domain->iommu != qcom_iommu) {
dev_err(dev, "cannot attach to IOMMU %s while already "
"attached to domain on IOMMU %s\n",
dev_name(qcom_domain->iommu->dev),
dev_name(qcom_iommu->dev));
return -EINVAL;
}
return 0;
}
static void qcom_iommu_detach_dev(struct iommu_domain *domain, struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct qcom_iommu_dev *qcom_iommu = to_iommu(fwspec);
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
unsigned i;
if (!qcom_domain->iommu)
return;
pm_runtime_get_sync(qcom_iommu->dev);
for (i = 0; i < fwspec->num_ids; i++) {
struct qcom_iommu_ctx *ctx = to_ctx(fwspec, fwspec->ids[i]);
/* Disable the context bank: */
iommu_writel(ctx, ARM_SMMU_CB_SCTLR, 0);
ctx->domain = NULL;
}
pm_runtime_put_sync(qcom_iommu->dev);
qcom_domain->iommu = NULL;
}
static int qcom_iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot)
{
int ret;
unsigned long flags;
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
struct io_pgtable_ops *ops = qcom_domain->pgtbl_ops;
if (!ops)
return -ENODEV;
spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
ret = ops->map(ops, iova, paddr, size, prot);
spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
return ret;
}
static size_t qcom_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
size_t size)
{
size_t ret;
unsigned long flags;
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
struct io_pgtable_ops *ops = qcom_domain->pgtbl_ops;
if (!ops)
return 0;
/* NOTE: unmap can be called after client device is powered off,
* for example, with GPUs or anything involving dma-buf. So we
* cannot rely on the device_link. Make sure the IOMMU is on to
* avoid unclocked accesses in the TLB inv path:
*/
pm_runtime_get_sync(qcom_domain->iommu->dev);
spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
ret = ops->unmap(ops, iova, size);
spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
pm_runtime_put_sync(qcom_domain->iommu->dev);
return ret;
}
static void qcom_iommu_iotlb_sync(struct iommu_domain *domain)
{
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
struct io_pgtable *pgtable = container_of(qcom_domain->pgtbl_ops,
struct io_pgtable, ops);
if (!qcom_domain->pgtbl_ops)
return;
pm_runtime_get_sync(qcom_domain->iommu->dev);
qcom_iommu_tlb_sync(pgtable->cookie);
pm_runtime_put_sync(qcom_domain->iommu->dev);
}
static phys_addr_t qcom_iommu_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
phys_addr_t ret;
unsigned long flags;
struct qcom_iommu_domain *qcom_domain = to_qcom_iommu_domain(domain);
struct io_pgtable_ops *ops = qcom_domain->pgtbl_ops;
if (!ops)
return 0;
spin_lock_irqsave(&qcom_domain->pgtbl_lock, flags);
ret = ops->iova_to_phys(ops, iova);
spin_unlock_irqrestore(&qcom_domain->pgtbl_lock, flags);
return ret;
}
static bool qcom_iommu_capable(enum iommu_cap cap)
{
switch (cap) {
case IOMMU_CAP_CACHE_COHERENCY:
/*
* Return true here as the SMMU can always send out coherent
* requests.
*/
return true;
case IOMMU_CAP_NOEXEC:
return true;
default:
return false;
}
}
static int qcom_iommu_add_device(struct device *dev)
{
struct qcom_iommu_dev *qcom_iommu = to_iommu(dev_iommu_fwspec_get(dev));
struct iommu_group *group;
struct device_link *link;
if (!qcom_iommu)
return -ENODEV;
/*
* Establish the link between iommu and master, so that the
* iommu gets runtime enabled/disabled as per the master's
* needs.
*/
link = device_link_add(dev, qcom_iommu->dev, DL_FLAG_PM_RUNTIME);
if (!link) {
dev_err(qcom_iommu->dev, "Unable to create device link between %s and %s\n",
dev_name(qcom_iommu->dev), dev_name(dev));
return -ENODEV;
}
group = iommu_group_get_for_dev(dev);
if (IS_ERR_OR_NULL(group))
return PTR_ERR_OR_ZERO(group);
iommu_group_put(group);
iommu_device_link(&qcom_iommu->iommu, dev);
return 0;
}
static void qcom_iommu_remove_device(struct device *dev)
{
struct qcom_iommu_dev *qcom_iommu = to_iommu(dev_iommu_fwspec_get(dev));
if (!qcom_iommu)
return;
iommu_device_unlink(&qcom_iommu->iommu, dev);
iommu_group_remove_device(dev);
iommu_fwspec_free(dev);
}
static int qcom_iommu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct qcom_iommu_dev *qcom_iommu;
struct platform_device *iommu_pdev;
unsigned asid = args->args[0];
if (args->args_count != 1) {
dev_err(dev, "incorrect number of iommu params found for %s "
"(found %d, expected 1)\n",
args->np->full_name, args->args_count);
return -EINVAL;
}
iommu_pdev = of_find_device_by_node(args->np);
if (WARN_ON(!iommu_pdev))
return -EINVAL;
qcom_iommu = platform_get_drvdata(iommu_pdev);
/* make sure the asid specified in dt is valid, so we don't have
* to sanity check this elsewhere, since 'asid - 1' is used to
* index into qcom_iommu->ctxs:
*/
if (WARN_ON(asid < 1) ||
WARN_ON(asid > qcom_iommu->num_ctxs))
return -EINVAL;
if (!fwspec->iommu_priv) {
fwspec->iommu_priv = qcom_iommu;
} else {
/* make sure devices iommus dt node isn't referring to
* multiple different iommu devices. Multiple context
* banks are ok, but multiple devices are not:
*/
if (WARN_ON(qcom_iommu != fwspec->iommu_priv))
return -EINVAL;
}
return iommu_fwspec_add_ids(dev, &asid, 1);
}
static const struct iommu_ops qcom_iommu_ops = {
.capable = qcom_iommu_capable,
.domain_alloc = qcom_iommu_domain_alloc,
.domain_free = qcom_iommu_domain_free,
.attach_dev = qcom_iommu_attach_dev,
.detach_dev = qcom_iommu_detach_dev,
.map = qcom_iommu_map,
.unmap = qcom_iommu_unmap,
.flush_iotlb_all = qcom_iommu_iotlb_sync,
.iotlb_sync = qcom_iommu_iotlb_sync,
.iova_to_phys = qcom_iommu_iova_to_phys,
.add_device = qcom_iommu_add_device,
.remove_device = qcom_iommu_remove_device,
.device_group = generic_device_group,
.of_xlate = qcom_iommu_of_xlate,
.pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
};
static int qcom_iommu_enable_clocks(struct qcom_iommu_dev *qcom_iommu)
{
int ret;
ret = clk_prepare_enable(qcom_iommu->iface_clk);
if (ret) {
dev_err(qcom_iommu->dev, "Couldn't enable iface_clk\n");
return ret;
}
ret = clk_prepare_enable(qcom_iommu->bus_clk);
if (ret) {
dev_err(qcom_iommu->dev, "Couldn't enable bus_clk\n");
clk_disable_unprepare(qcom_iommu->iface_clk);
return ret;
}
return 0;
}
static void qcom_iommu_disable_clocks(struct qcom_iommu_dev *qcom_iommu)
{
clk_disable_unprepare(qcom_iommu->bus_clk);
clk_disable_unprepare(qcom_iommu->iface_clk);
}
static int qcom_iommu_sec_ptbl_init(struct device *dev)
{
size_t psize = 0;
unsigned int spare = 0;
void *cpu_addr;
dma_addr_t paddr;
unsigned long attrs;
static bool allocated = false;
int ret;
if (allocated)
return 0;
ret = qcom_scm_iommu_secure_ptbl_size(spare, &psize);
if (ret) {
dev_err(dev, "failed to get iommu secure pgtable size (%d)\n",
ret);
return ret;
}
dev_info(dev, "iommu sec: pgtable size: %zu\n", psize);
attrs = DMA_ATTR_NO_KERNEL_MAPPING;
cpu_addr = dma_alloc_attrs(dev, psize, &paddr, GFP_KERNEL, attrs);
if (!cpu_addr) {
dev_err(dev, "failed to allocate %zu bytes for pgtable\n",
psize);
return -ENOMEM;
}
ret = qcom_scm_iommu_secure_ptbl_init(paddr, psize, spare);
if (ret) {
dev_err(dev, "failed to init iommu pgtable (%d)\n", ret);
goto free_mem;
}
allocated = true;
return 0;
free_mem:
dma_free_attrs(dev, psize, cpu_addr, paddr, attrs);
return ret;
}
static int get_asid(const struct device_node *np)
{
u32 reg;
/* read the "reg" property directly to get the relative address
* of the context bank, and calculate the asid from that:
*/
if (of_property_read_u32_index(np, "reg", 0, &reg))
return -ENODEV;
return reg / 0x1000; /* context banks are 0x1000 apart */
}
static int qcom_iommu_ctx_probe(struct platform_device *pdev)
{
struct qcom_iommu_ctx *ctx;
struct device *dev = &pdev->dev;
struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev->parent);
struct resource *res;
int ret, irq;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->dev = dev;
platform_set_drvdata(pdev, ctx);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
ctx->base = devm_ioremap_resource(dev, res);
if (IS_ERR(ctx->base))
return PTR_ERR(ctx->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "failed to get irq\n");
return -ENODEV;
}
/* clear IRQs before registering fault handler, just in case the
* boot-loader left us a surprise:
*/
iommu_writel(ctx, ARM_SMMU_CB_FSR, iommu_readl(ctx, ARM_SMMU_CB_FSR));
ret = devm_request_irq(dev, irq,
qcom_iommu_fault,
IRQF_SHARED,
"qcom-iommu-fault",
ctx);
if (ret) {
dev_err(dev, "failed to request IRQ %u\n", irq);
return ret;
}
ret = get_asid(dev->of_node);
if (ret < 0) {
dev_err(dev, "missing reg property\n");
return ret;
}
ctx->asid = ret;
dev_dbg(dev, "found asid %u\n", ctx->asid);
qcom_iommu->ctxs[ctx->asid - 1] = ctx;
return 0;
}
static int qcom_iommu_ctx_remove(struct platform_device *pdev)
{
struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(pdev->dev.parent);
struct qcom_iommu_ctx *ctx = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
qcom_iommu->ctxs[ctx->asid - 1] = NULL;
return 0;
}
static const struct of_device_id ctx_of_match[] = {
{ .compatible = "qcom,msm-iommu-v1-ns" },
{ .compatible = "qcom,msm-iommu-v1-sec" },
{ /* sentinel */ }
};
static struct platform_driver qcom_iommu_ctx_driver = {
.driver = {
.name = "qcom-iommu-ctx",
.of_match_table = of_match_ptr(ctx_of_match),
},
.probe = qcom_iommu_ctx_probe,
.remove = qcom_iommu_ctx_remove,
};
static bool qcom_iommu_has_secure_context(struct qcom_iommu_dev *qcom_iommu)
{
struct device_node *child;
for_each_child_of_node(qcom_iommu->dev->of_node, child)
if (of_device_is_compatible(child, "qcom,msm-iommu-v1-sec"))
return true;
return false;
}
static int qcom_iommu_device_probe(struct platform_device *pdev)
{
struct device_node *child;
struct qcom_iommu_dev *qcom_iommu;
struct device *dev = &pdev->dev;
struct resource *res;
int ret, sz, max_asid = 0;
/* find the max asid (which is 1:1 to ctx bank idx), so we know how
* many child ctx devices we have:
*/
for_each_child_of_node(dev->of_node, child)
max_asid = max(max_asid, get_asid(child));
sz = sizeof(*qcom_iommu) + (max_asid * sizeof(qcom_iommu->ctxs[0]));
qcom_iommu = devm_kzalloc(dev, sz, GFP_KERNEL);
if (!qcom_iommu)
return -ENOMEM;
qcom_iommu->num_ctxs = max_asid;
qcom_iommu->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res)
qcom_iommu->local_base = devm_ioremap_resource(dev, res);
qcom_iommu->iface_clk = devm_clk_get(dev, "iface");
if (IS_ERR(qcom_iommu->iface_clk)) {
dev_err(dev, "failed to get iface clock\n");
return PTR_ERR(qcom_iommu->iface_clk);
}
qcom_iommu->bus_clk = devm_clk_get(dev, "bus");
if (IS_ERR(qcom_iommu->bus_clk)) {
dev_err(dev, "failed to get bus clock\n");
return PTR_ERR(qcom_iommu->bus_clk);
}
if (of_property_read_u32(dev->of_node, "qcom,iommu-secure-id",
&qcom_iommu->sec_id)) {
dev_err(dev, "missing qcom,iommu-secure-id property\n");
return -ENODEV;
}
if (qcom_iommu_has_secure_context(qcom_iommu)) {
ret = qcom_iommu_sec_ptbl_init(dev);
if (ret) {
dev_err(dev, "cannot init secure pg table(%d)\n", ret);
return ret;
}
}
platform_set_drvdata(pdev, qcom_iommu);
pm_runtime_enable(dev);
/* register context bank devices, which are child nodes: */
ret = devm_of_platform_populate(dev);
if (ret) {
dev_err(dev, "Failed to populate iommu contexts\n");
return ret;
}
ret = iommu_device_sysfs_add(&qcom_iommu->iommu, dev, NULL,
dev_name(dev));
if (ret) {
dev_err(dev, "Failed to register iommu in sysfs\n");
return ret;
}
iommu_device_set_ops(&qcom_iommu->iommu, &qcom_iommu_ops);
iommu_device_set_fwnode(&qcom_iommu->iommu, dev->fwnode);
ret = iommu_device_register(&qcom_iommu->iommu);
if (ret) {
dev_err(dev, "Failed to register iommu\n");
return ret;
}
bus_set_iommu(&platform_bus_type, &qcom_iommu_ops);
if (qcom_iommu->local_base) {
pm_runtime_get_sync(dev);
writel_relaxed(0xffffffff, qcom_iommu->local_base + SMMU_INTR_SEL_NS);
pm_runtime_put_sync(dev);
}
return 0;
}
static int qcom_iommu_device_remove(struct platform_device *pdev)
{
struct qcom_iommu_dev *qcom_iommu = platform_get_drvdata(pdev);
bus_set_iommu(&platform_bus_type, NULL);
pm_runtime_force_suspend(&pdev->dev);
platform_set_drvdata(pdev, NULL);
iommu_device_sysfs_remove(&qcom_iommu->iommu);
iommu_device_unregister(&qcom_iommu->iommu);
return 0;
}
static int __maybe_unused qcom_iommu_resume(struct device *dev)
{
struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev);
return qcom_iommu_enable_clocks(qcom_iommu);
}
static int __maybe_unused qcom_iommu_suspend(struct device *dev)
{
struct qcom_iommu_dev *qcom_iommu = dev_get_drvdata(dev);
qcom_iommu_disable_clocks(qcom_iommu);
return 0;
}
static const struct dev_pm_ops qcom_iommu_pm_ops = {
SET_RUNTIME_PM_OPS(qcom_iommu_suspend, qcom_iommu_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static const struct of_device_id qcom_iommu_of_match[] = {
{ .compatible = "qcom,msm-iommu-v1" },
{ /* sentinel */ }
};
static struct platform_driver qcom_iommu_driver = {
.driver = {
.name = "qcom-iommu",
.of_match_table = of_match_ptr(qcom_iommu_of_match),
.pm = &qcom_iommu_pm_ops,
},
.probe = qcom_iommu_device_probe,
.remove = qcom_iommu_device_remove,
};
static int __init qcom_iommu_init(void)
{
int ret;
ret = platform_driver_register(&qcom_iommu_ctx_driver);
if (ret)
return ret;
ret = platform_driver_register(&qcom_iommu_driver);
if (ret)
platform_driver_unregister(&qcom_iommu_ctx_driver);
return ret;
}
device_initcall(qcom_iommu_init);