blob: 87bf522b9d2eec034d66bf6c5d144384ae7093fa [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2019-2020 NVIDIA CORPORATION. All rights reserved.
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <soc/tegra/mc.h>
#include "arm-smmu.h"
/*
* Tegra194 has three ARM MMU-500 Instances.
* Two of them are used together and must be programmed identically for
* interleaved IOVA accesses across them and translates accesses from
* non-isochronous HW devices.
* Third one is used for translating accesses from isochronous HW devices.
*
* In addition, the SMMU driver needs to coordinate with the memory controller
* driver to ensure that the right SID override is programmed for any given
* memory client. This is necessary to allow for use-case such as seamlessly
* handing over the display controller configuration from the firmware to the
* kernel.
*
* This implementation supports programming of the two instances that must
* be programmed identically and takes care of invoking the memory controller
* driver for SID override programming after devices have been attached to an
* SMMU instance.
*/
#define MAX_SMMU_INSTANCES 2
struct nvidia_smmu {
struct arm_smmu_device smmu;
void __iomem *bases[MAX_SMMU_INSTANCES];
unsigned int num_instances;
struct tegra_mc *mc;
};
static inline struct nvidia_smmu *to_nvidia_smmu(struct arm_smmu_device *smmu)
{
return container_of(smmu, struct nvidia_smmu, smmu);
}
static inline void __iomem *nvidia_smmu_page(struct arm_smmu_device *smmu,
unsigned int inst, int page)
{
struct nvidia_smmu *nvidia_smmu;
nvidia_smmu = container_of(smmu, struct nvidia_smmu, smmu);
return nvidia_smmu->bases[inst] + (page << smmu->pgshift);
}
static u32 nvidia_smmu_read_reg(struct arm_smmu_device *smmu,
int page, int offset)
{
void __iomem *reg = nvidia_smmu_page(smmu, 0, page) + offset;
return readl_relaxed(reg);
}
static void nvidia_smmu_write_reg(struct arm_smmu_device *smmu,
int page, int offset, u32 val)
{
struct nvidia_smmu *nvidia = to_nvidia_smmu(smmu);
unsigned int i;
for (i = 0; i < nvidia->num_instances; i++) {
void __iomem *reg = nvidia_smmu_page(smmu, i, page) + offset;
writel_relaxed(val, reg);
}
}
static u64 nvidia_smmu_read_reg64(struct arm_smmu_device *smmu,
int page, int offset)
{
void __iomem *reg = nvidia_smmu_page(smmu, 0, page) + offset;
return readq_relaxed(reg);
}
static void nvidia_smmu_write_reg64(struct arm_smmu_device *smmu,
int page, int offset, u64 val)
{
struct nvidia_smmu *nvidia = to_nvidia_smmu(smmu);
unsigned int i;
for (i = 0; i < nvidia->num_instances; i++) {
void __iomem *reg = nvidia_smmu_page(smmu, i, page) + offset;
writeq_relaxed(val, reg);
}
}
static void nvidia_smmu_tlb_sync(struct arm_smmu_device *smmu, int page,
int sync, int status)
{
struct nvidia_smmu *nvidia = to_nvidia_smmu(smmu);
unsigned int delay;
arm_smmu_writel(smmu, page, sync, 0);
for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) {
unsigned int spin_cnt;
for (spin_cnt = TLB_SPIN_COUNT; spin_cnt > 0; spin_cnt--) {
u32 val = 0;
unsigned int i;
for (i = 0; i < nvidia->num_instances; i++) {
void __iomem *reg;
reg = nvidia_smmu_page(smmu, i, page) + status;
val |= readl_relaxed(reg);
}
if (!(val & ARM_SMMU_sTLBGSTATUS_GSACTIVE))
return;
cpu_relax();
}
udelay(delay);
}
dev_err_ratelimited(smmu->dev,
"TLB sync timed out -- SMMU may be deadlocked\n");
}
static int nvidia_smmu_reset(struct arm_smmu_device *smmu)
{
struct nvidia_smmu *nvidia = to_nvidia_smmu(smmu);
unsigned int i;
for (i = 0; i < nvidia->num_instances; i++) {
u32 val;
void __iomem *reg = nvidia_smmu_page(smmu, i, ARM_SMMU_GR0) +
ARM_SMMU_GR0_sGFSR;
/* clear global FSR */
val = readl_relaxed(reg);
writel_relaxed(val, reg);
}
return 0;
}
static irqreturn_t nvidia_smmu_global_fault_inst(int irq,
struct arm_smmu_device *smmu,
int inst)
{
u32 gfsr, gfsynr0, gfsynr1, gfsynr2;
void __iomem *gr0_base = nvidia_smmu_page(smmu, inst, 0);
gfsr = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR);
if (!gfsr)
return IRQ_NONE;
gfsynr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR0);
gfsynr1 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR1);
gfsynr2 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR2);
dev_err_ratelimited(smmu->dev,
"Unexpected global fault, this could be serious\n");
dev_err_ratelimited(smmu->dev,
"\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n",
gfsr, gfsynr0, gfsynr1, gfsynr2);
writel_relaxed(gfsr, gr0_base + ARM_SMMU_GR0_sGFSR);
return IRQ_HANDLED;
}
static irqreturn_t nvidia_smmu_global_fault(int irq, void *dev)
{
unsigned int inst;
irqreturn_t ret = IRQ_NONE;
struct arm_smmu_device *smmu = dev;
struct nvidia_smmu *nvidia = to_nvidia_smmu(smmu);
for (inst = 0; inst < nvidia->num_instances; inst++) {
irqreturn_t irq_ret;
irq_ret = nvidia_smmu_global_fault_inst(irq, smmu, inst);
if (irq_ret == IRQ_HANDLED)
ret = IRQ_HANDLED;
}
return ret;
}
static irqreturn_t nvidia_smmu_context_fault_bank(int irq,
struct arm_smmu_device *smmu,
int idx, int inst)
{
u32 fsr, fsynr, cbfrsynra;
unsigned long iova;
void __iomem *gr1_base = nvidia_smmu_page(smmu, inst, 1);
void __iomem *cb_base = nvidia_smmu_page(smmu, inst, smmu->numpage + idx);
fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR);
if (!(fsr & ARM_SMMU_FSR_FAULT))
return IRQ_NONE;
fsynr = readl_relaxed(cb_base + ARM_SMMU_CB_FSYNR0);
iova = readq_relaxed(cb_base + ARM_SMMU_CB_FAR);
cbfrsynra = readl_relaxed(gr1_base + ARM_SMMU_GR1_CBFRSYNRA(idx));
dev_err_ratelimited(smmu->dev,
"Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
fsr, iova, fsynr, cbfrsynra, idx);
writel_relaxed(fsr, cb_base + ARM_SMMU_CB_FSR);
return IRQ_HANDLED;
}
static irqreturn_t nvidia_smmu_context_fault(int irq, void *dev)
{
int idx;
unsigned int inst;
irqreturn_t ret = IRQ_NONE;
struct arm_smmu_device *smmu;
struct iommu_domain *domain = dev;
struct arm_smmu_domain *smmu_domain;
struct nvidia_smmu *nvidia;
smmu_domain = container_of(domain, struct arm_smmu_domain, domain);
smmu = smmu_domain->smmu;
nvidia = to_nvidia_smmu(smmu);
for (inst = 0; inst < nvidia->num_instances; inst++) {
irqreturn_t irq_ret;
/*
* Interrupt line is shared between all contexts.
* Check for faults across all contexts.
*/
for (idx = 0; idx < smmu->num_context_banks; idx++) {
irq_ret = nvidia_smmu_context_fault_bank(irq, smmu,
idx, inst);
if (irq_ret == IRQ_HANDLED)
ret = IRQ_HANDLED;
}
}
return ret;
}
static void nvidia_smmu_probe_finalize(struct arm_smmu_device *smmu, struct device *dev)
{
struct nvidia_smmu *nvidia = to_nvidia_smmu(smmu);
int err;
err = tegra_mc_probe_device(nvidia->mc, dev);
if (err < 0)
dev_err(smmu->dev, "memory controller probe failed for %s: %d\n",
dev_name(dev), err);
}
static int nvidia_smmu_init_context(struct arm_smmu_domain *smmu_domain,
struct io_pgtable_cfg *pgtbl_cfg,
struct device *dev)
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
const struct device_node *np = smmu->dev->of_node;
/*
* Tegra194 and Tegra234 SoCs have the erratum that causes walk cache
* entries to not be invalidated correctly. The problem is that the walk
* cache index generated for IOVA is not same across translation and
* invalidation requests. This is leading to page faults when PMD entry
* is released during unmap and populated with new PTE table during
* subsequent map request. Disabling large page mappings avoids the
* release of PMD entry and avoid translations seeing stale PMD entry in
* walk cache.
* Fix this by limiting the page mappings to PAGE_SIZE on Tegra194 and
* Tegra234.
*/
if (of_device_is_compatible(np, "nvidia,tegra234-smmu") ||
of_device_is_compatible(np, "nvidia,tegra194-smmu")) {
smmu->pgsize_bitmap = PAGE_SIZE;
pgtbl_cfg->pgsize_bitmap = smmu->pgsize_bitmap;
}
return 0;
}
static const struct arm_smmu_impl nvidia_smmu_impl = {
.read_reg = nvidia_smmu_read_reg,
.write_reg = nvidia_smmu_write_reg,
.read_reg64 = nvidia_smmu_read_reg64,
.write_reg64 = nvidia_smmu_write_reg64,
.reset = nvidia_smmu_reset,
.tlb_sync = nvidia_smmu_tlb_sync,
.global_fault = nvidia_smmu_global_fault,
.context_fault = nvidia_smmu_context_fault,
.probe_finalize = nvidia_smmu_probe_finalize,
.init_context = nvidia_smmu_init_context,
};
static const struct arm_smmu_impl nvidia_smmu_single_impl = {
.probe_finalize = nvidia_smmu_probe_finalize,
.init_context = nvidia_smmu_init_context,
};
struct arm_smmu_device *nvidia_smmu_impl_init(struct arm_smmu_device *smmu)
{
struct resource *res;
struct device *dev = smmu->dev;
struct nvidia_smmu *nvidia_smmu;
struct platform_device *pdev = to_platform_device(dev);
unsigned int i;
nvidia_smmu = devm_krealloc(dev, smmu, sizeof(*nvidia_smmu), GFP_KERNEL);
if (!nvidia_smmu)
return ERR_PTR(-ENOMEM);
nvidia_smmu->mc = devm_tegra_memory_controller_get(dev);
if (IS_ERR(nvidia_smmu->mc))
return ERR_CAST(nvidia_smmu->mc);
/* Instance 0 is ioremapped by arm-smmu.c. */
nvidia_smmu->bases[0] = smmu->base;
nvidia_smmu->num_instances++;
for (i = 1; i < MAX_SMMU_INSTANCES; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res)
break;
nvidia_smmu->bases[i] = devm_ioremap_resource(dev, res);
if (IS_ERR(nvidia_smmu->bases[i]))
return ERR_CAST(nvidia_smmu->bases[i]);
nvidia_smmu->num_instances++;
}
if (nvidia_smmu->num_instances == 1)
nvidia_smmu->smmu.impl = &nvidia_smmu_single_impl;
else
nvidia_smmu->smmu.impl = &nvidia_smmu_impl;
return &nvidia_smmu->smmu;
}