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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt6
-rw-r--r--Documentation/devicetree/bindings/iommu/arm,smmu.txt28
-rw-r--r--drivers/iommu/arm-smmu-v3.c76
-rw-r--r--drivers/iommu/arm-smmu.c259
-rw-r--r--drivers/iommu/io-pgtable-arm.c2
-rw-r--r--drivers/iommu/iommu.c28
-rw-r--r--include/linux/iommu.h11
7 files changed, 281 insertions, 129 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index facc20a3f962..cb91f26cc8bc 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1644,6 +1644,12 @@
nobypass [PPC/POWERNV]
Disable IOMMU bypass, using IOMMU for PCI devices.
+ iommu.passthrough=
+ [ARM64] Configure DMA to bypass the IOMMU by default.
+ Format: { "0" | "1" }
+ 0 - Use IOMMU translation for DMA.
+ 1 - Bypass the IOMMU for DMA.
+ unset - Use IOMMU translation for DMA.
io7= [HW] IO7 for Marvel based alpha systems
See comment before marvel_specify_io7 in
diff --git a/Documentation/devicetree/bindings/iommu/arm,smmu.txt b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
index 6cdf32d037fc..8a6ffce12af5 100644
--- a/Documentation/devicetree/bindings/iommu/arm,smmu.txt
+++ b/Documentation/devicetree/bindings/iommu/arm,smmu.txt
@@ -60,6 +60,17 @@ conditions.
aliases of secure registers have to be used during
SMMU configuration.
+- stream-match-mask : For SMMUs supporting stream matching and using
+ #iommu-cells = <1>, specifies a mask of bits to ignore
+ when matching stream IDs (e.g. this may be programmed
+ into the SMRn.MASK field of every stream match register
+ used). For cases where it is desirable to ignore some
+ portion of every Stream ID (e.g. for certain MMU-500
+ configurations given globally unique input IDs). This
+ property is not valid for SMMUs using stream indexing,
+ or using stream matching with #iommu-cells = <2>, and
+ may be ignored if present in such cases.
+
** Deprecated properties:
- mmu-masters (deprecated in favour of the generic "iommus" binding) :
@@ -109,3 +120,20 @@ conditions.
master3 {
iommus = <&smmu2 1 0x30>;
};
+
+
+ /* ARM MMU-500 with 10-bit stream ID input configuration */
+ smmu3: iommu {
+ compatible = "arm,mmu-500", "arm,smmu-v2";
+ ...
+ #iommu-cells = <1>;
+ /* always ignore appended 5-bit TBU number */
+ stream-match-mask = 0x7c00;
+ };
+
+ bus {
+ /* bus whose child devices emit one unique 10-bit stream
+ ID each, but may master through multiple SMMU TBUs */
+ iommu-map = <0 &smmu3 0 0x400>;
+ ...
+ };
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 591bb96047c9..803352d78d43 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -554,9 +554,14 @@ struct arm_smmu_s2_cfg {
};
struct arm_smmu_strtab_ent {
- bool valid;
-
- bool bypass; /* Overrides s1/s2 config */
+ /*
+ * An STE is "assigned" if the master emitting the corresponding SID
+ * is attached to a domain. The behaviour of an unassigned STE is
+ * determined by the disable_bypass parameter, whereas an assigned
+ * STE behaves according to s1_cfg/s2_cfg, which themselves are
+ * configured according to the domain type.
+ */
+ bool assigned;
struct arm_smmu_s1_cfg *s1_cfg;
struct arm_smmu_s2_cfg *s2_cfg;
};
@@ -632,6 +637,7 @@ enum arm_smmu_domain_stage {
ARM_SMMU_DOMAIN_S1 = 0,
ARM_SMMU_DOMAIN_S2,
ARM_SMMU_DOMAIN_NESTED,
+ ARM_SMMU_DOMAIN_BYPASS,
};
struct arm_smmu_domain {
@@ -1005,9 +1011,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
* This is hideously complicated, but we only really care about
* three cases at the moment:
*
- * 1. Invalid (all zero) -> bypass (init)
- * 2. Bypass -> translation (attach)
- * 3. Translation -> bypass (detach)
+ * 1. Invalid (all zero) -> bypass/fault (init)
+ * 2. Bypass/fault -> translation/bypass (attach)
+ * 3. Translation/bypass -> bypass/fault (detach)
*
* Given that we can't update the STE atomically and the SMMU
* doesn't read the thing in a defined order, that leaves us
@@ -1046,11 +1052,15 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
}
/* Nuke the existing STE_0 value, as we're going to rewrite it */
- val = ste->valid ? STRTAB_STE_0_V : 0;
+ val = STRTAB_STE_0_V;
+
+ /* Bypass/fault */
+ if (!ste->assigned || !(ste->s1_cfg || ste->s2_cfg)) {
+ if (!ste->assigned && disable_bypass)
+ val |= STRTAB_STE_0_CFG_ABORT;
+ else
+ val |= STRTAB_STE_0_CFG_BYPASS;
- if (ste->bypass) {
- val |= disable_bypass ? STRTAB_STE_0_CFG_ABORT
- : STRTAB_STE_0_CFG_BYPASS;
dst[0] = cpu_to_le64(val);
dst[1] = cpu_to_le64(STRTAB_STE_1_SHCFG_INCOMING
<< STRTAB_STE_1_SHCFG_SHIFT);
@@ -1111,10 +1121,7 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid,
static void arm_smmu_init_bypass_stes(u64 *strtab, unsigned int nent)
{
unsigned int i;
- struct arm_smmu_strtab_ent ste = {
- .valid = true,
- .bypass = true,
- };
+ struct arm_smmu_strtab_ent ste = { .assigned = false };
for (i = 0; i < nent; ++i) {
arm_smmu_write_strtab_ent(NULL, -1, strtab, &ste);
@@ -1378,7 +1385,9 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
{
struct arm_smmu_domain *smmu_domain;
- if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
+ if (type != IOMMU_DOMAIN_UNMANAGED &&
+ type != IOMMU_DOMAIN_DMA &&
+ type != IOMMU_DOMAIN_IDENTITY)
return NULL;
/*
@@ -1509,6 +1518,11 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain)
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_device *smmu = smmu_domain->smmu;
+ if (domain->type == IOMMU_DOMAIN_IDENTITY) {
+ smmu_domain->stage = ARM_SMMU_DOMAIN_BYPASS;
+ return 0;
+ }
+
/* Restrict the stage to what we can actually support */
if (!(smmu->features & ARM_SMMU_FEAT_TRANS_S1))
smmu_domain->stage = ARM_SMMU_DOMAIN_S2;
@@ -1579,7 +1593,7 @@ static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)
return step;
}
-static int arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
+static void arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
{
int i;
struct arm_smmu_master_data *master = fwspec->iommu_priv;
@@ -1591,17 +1605,14 @@ static int arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
arm_smmu_write_strtab_ent(smmu, sid, step, &master->ste);
}
-
- return 0;
}
static void arm_smmu_detach_dev(struct device *dev)
{
struct arm_smmu_master_data *master = dev->iommu_fwspec->iommu_priv;
- master->ste.bypass = true;
- if (arm_smmu_install_ste_for_dev(dev->iommu_fwspec) < 0)
- dev_warn(dev, "failed to install bypass STE\n");
+ master->ste.assigned = false;
+ arm_smmu_install_ste_for_dev(dev->iommu_fwspec);
}
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
@@ -1620,7 +1631,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
ste = &master->ste;
/* Already attached to a different domain? */
- if (!ste->bypass)
+ if (ste->assigned)
arm_smmu_detach_dev(dev);
mutex_lock(&smmu_domain->init_mutex);
@@ -1641,10 +1652,12 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
goto out_unlock;
}
- ste->bypass = false;
- ste->valid = true;
+ ste->assigned = true;
- if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
+ if (smmu_domain->stage == ARM_SMMU_DOMAIN_BYPASS) {
+ ste->s1_cfg = NULL;
+ ste->s2_cfg = NULL;
+ } else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
ste->s1_cfg = &smmu_domain->s1_cfg;
ste->s2_cfg = NULL;
arm_smmu_write_ctx_desc(smmu, ste->s1_cfg);
@@ -1653,10 +1666,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
ste->s2_cfg = &smmu_domain->s2_cfg;
}
- ret = arm_smmu_install_ste_for_dev(dev->iommu_fwspec);
- if (ret < 0)
- ste->valid = false;
-
+ arm_smmu_install_ste_for_dev(dev->iommu_fwspec);
out_unlock:
mutex_unlock(&smmu_domain->init_mutex);
return ret;
@@ -1807,7 +1817,7 @@ static void arm_smmu_remove_device(struct device *dev)
master = fwspec->iommu_priv;
smmu = master->smmu;
- if (master && master->ste.valid)
+ if (master && master->ste.assigned)
arm_smmu_detach_dev(dev);
iommu_group_remove_device(dev);
iommu_device_unlink(&smmu->iommu, dev);
@@ -1837,6 +1847,9 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
+
switch (attr) {
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
@@ -1852,6 +1865,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
int ret = 0;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
+
mutex_lock(&smmu_domain->init_mutex);
switch (attr) {
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index b493c99e17f7..dbd4998661c6 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -162,6 +162,7 @@
#define ARM_SMMU_GR0_sTLBGSTATUS 0x74
#define sTLBGSTATUS_GSACTIVE (1 << 0)
#define TLB_LOOP_TIMEOUT 1000000 /* 1s! */
+#define TLB_SPIN_COUNT 10
/* Stream mapping registers */
#define ARM_SMMU_GR0_SMR(n) (0x800 + ((n) << 2))
@@ -216,8 +217,7 @@ enum arm_smmu_s2cr_privcfg {
#define CBA2R_VMID_MASK 0xffff
/* Translation context bank */
-#define ARM_SMMU_CB_BASE(smmu) ((smmu)->base + ((smmu)->size >> 1))
-#define ARM_SMMU_CB(smmu, n) ((n) * (1 << (smmu)->pgshift))
+#define ARM_SMMU_CB(smmu, n) ((smmu)->cb_base + ((n) << (smmu)->pgshift))
#define ARM_SMMU_CB_SCTLR 0x0
#define ARM_SMMU_CB_ACTLR 0x4
@@ -238,6 +238,8 @@ enum arm_smmu_s2cr_privcfg {
#define ARM_SMMU_CB_S1_TLBIVAL 0x620
#define ARM_SMMU_CB_S2_TLBIIPAS2 0x630
#define ARM_SMMU_CB_S2_TLBIIPAS2L 0x638
+#define ARM_SMMU_CB_TLBSYNC 0x7f0
+#define ARM_SMMU_CB_TLBSTATUS 0x7f4
#define ARM_SMMU_CB_ATS1PR 0x800
#define ARM_SMMU_CB_ATSR 0x8f0
@@ -344,7 +346,7 @@ struct arm_smmu_device {
struct device *dev;
void __iomem *base;
- unsigned long size;
+ void __iomem *cb_base;
unsigned long pgshift;
#define ARM_SMMU_FEAT_COHERENT_WALK (1 << 0)
@@ -404,18 +406,20 @@ enum arm_smmu_context_fmt {
struct arm_smmu_cfg {
u8 cbndx;
u8 irptndx;
+ union {
+ u16 asid;
+ u16 vmid;
+ };
u32 cbar;
enum arm_smmu_context_fmt fmt;
};
#define INVALID_IRPTNDX 0xff
-#define ARM_SMMU_CB_ASID(smmu, cfg) ((u16)(smmu)->cavium_id_base + (cfg)->cbndx)
-#define ARM_SMMU_CB_VMID(smmu, cfg) ((u16)(smmu)->cavium_id_base + (cfg)->cbndx + 1)
-
enum arm_smmu_domain_stage {
ARM_SMMU_DOMAIN_S1 = 0,
ARM_SMMU_DOMAIN_S2,
ARM_SMMU_DOMAIN_NESTED,
+ ARM_SMMU_DOMAIN_BYPASS,
};
struct arm_smmu_domain {
@@ -569,49 +573,67 @@ static void __arm_smmu_free_bitmap(unsigned long *map, int idx)
}
/* Wait for any pending TLB invalidations to complete */
-static void __arm_smmu_tlb_sync(struct arm_smmu_device *smmu)
+static void __arm_smmu_tlb_sync(struct arm_smmu_device *smmu,
+ void __iomem *sync, void __iomem *status)
{
- int count = 0;
- void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
-
- writel_relaxed(0, gr0_base + ARM_SMMU_GR0_sTLBGSYNC);
- while (readl_relaxed(gr0_base + ARM_SMMU_GR0_sTLBGSTATUS)
- & sTLBGSTATUS_GSACTIVE) {
- cpu_relax();
- if (++count == TLB_LOOP_TIMEOUT) {
- dev_err_ratelimited(smmu->dev,
- "TLB sync timed out -- SMMU may be deadlocked\n");
- return;
+ unsigned int spin_cnt, delay;
+
+ writel_relaxed(0, sync);
+ for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) {
+ for (spin_cnt = TLB_SPIN_COUNT; spin_cnt > 0; spin_cnt--) {
+ if (!(readl_relaxed(status) & sTLBGSTATUS_GSACTIVE))
+ return;
+ cpu_relax();
}
- udelay(1);
+ udelay(delay);
}
+ dev_err_ratelimited(smmu->dev,
+ "TLB sync timed out -- SMMU may be deadlocked\n");
+}
+
+static void arm_smmu_tlb_sync_global(struct arm_smmu_device *smmu)
+{
+ void __iomem *base = ARM_SMMU_GR0(smmu);
+
+ __arm_smmu_tlb_sync(smmu, base + ARM_SMMU_GR0_sTLBGSYNC,
+ base + ARM_SMMU_GR0_sTLBGSTATUS);
+}
+
+static void arm_smmu_tlb_sync_context(void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ void __iomem *base = ARM_SMMU_CB(smmu, smmu_domain->cfg.cbndx);
+
+ __arm_smmu_tlb_sync(smmu, base + ARM_SMMU_CB_TLBSYNC,
+ base + ARM_SMMU_CB_TLBSTATUS);
}
-static void arm_smmu_tlb_sync(void *cookie)
+static void arm_smmu_tlb_sync_vmid(void *cookie)
{
struct arm_smmu_domain *smmu_domain = cookie;
- __arm_smmu_tlb_sync(smmu_domain->smmu);
+
+ arm_smmu_tlb_sync_global(smmu_domain->smmu);
}
-static void arm_smmu_tlb_inv_context(void *cookie)
+static void arm_smmu_tlb_inv_context_s1(void *cookie)
{
struct arm_smmu_domain *smmu_domain = cookie;
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
- struct arm_smmu_device *smmu = smmu_domain->smmu;
- bool stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS;
- void __iomem *base;
+ void __iomem *base = ARM_SMMU_CB(smmu_domain->smmu, cfg->cbndx);
- if (stage1) {
- base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
- writel_relaxed(ARM_SMMU_CB_ASID(smmu, cfg),
- base + ARM_SMMU_CB_S1_TLBIASID);
- } else {
- base = ARM_SMMU_GR0(smmu);
- writel_relaxed(ARM_SMMU_CB_VMID(smmu, cfg),
- base + ARM_SMMU_GR0_TLBIVMID);
- }
+ writel_relaxed(cfg->asid, base + ARM_SMMU_CB_S1_TLBIASID);
+ arm_smmu_tlb_sync_context(cookie);
+}
- __arm_smmu_tlb_sync(smmu);
+static void arm_smmu_tlb_inv_context_s2(void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ void __iomem *base = ARM_SMMU_GR0(smmu);
+
+ writel_relaxed(smmu_domain->cfg.vmid, base + ARM_SMMU_GR0_TLBIVMID);
+ arm_smmu_tlb_sync_global(smmu);
}
static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
@@ -619,31 +641,28 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
{
struct arm_smmu_domain *smmu_domain = cookie;
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
- struct arm_smmu_device *smmu = smmu_domain->smmu;
bool stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS;
- void __iomem *reg;
+ void __iomem *reg = ARM_SMMU_CB(smmu_domain->smmu, cfg->cbndx);
if (stage1) {
- reg = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
reg += leaf ? ARM_SMMU_CB_S1_TLBIVAL : ARM_SMMU_CB_S1_TLBIVA;
if (cfg->fmt != ARM_SMMU_CTX_FMT_AARCH64) {
iova &= ~12UL;
- iova |= ARM_SMMU_CB_ASID(smmu, cfg);
+ iova |= cfg->asid;
do {
writel_relaxed(iova, reg);
iova += granule;
} while (size -= granule);
} else {
iova >>= 12;
- iova |= (u64)ARM_SMMU_CB_ASID(smmu, cfg) << 48;
+ iova |= (u64)cfg->asid << 48;
do {
writeq_relaxed(iova, reg);
iova += granule >> 12;
} while (size -= granule);
}
- } else if (smmu->version == ARM_SMMU_V2) {
- reg = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ } else {
reg += leaf ? ARM_SMMU_CB_S2_TLBIIPAS2L :
ARM_SMMU_CB_S2_TLBIIPAS2;
iova >>= 12;
@@ -651,16 +670,40 @@ static void arm_smmu_tlb_inv_range_nosync(unsigned long iova, size_t size,
smmu_write_atomic_lq(iova, reg);
iova += granule >> 12;
} while (size -= granule);
- } else {
- reg = ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_TLBIVMID;
- writel_relaxed(ARM_SMMU_CB_VMID(smmu, cfg), reg);
}
}
-static const struct iommu_gather_ops arm_smmu_gather_ops = {
- .tlb_flush_all = arm_smmu_tlb_inv_context,
+/*
+ * On MMU-401 at least, the cost of firing off multiple TLBIVMIDs appears
+ * almost negligible, but the benefit of getting the first one in as far ahead
+ * of the sync as possible is significant, hence we don't just make this a
+ * no-op and set .tlb_sync to arm_smmu_inv_context_s2() as you might think.
+ */
+static void arm_smmu_tlb_inv_vmid_nosync(unsigned long iova, size_t size,
+ size_t granule, bool leaf, void *cookie)
+{
+ struct arm_smmu_domain *smmu_domain = cookie;
+ void __iomem *base = ARM_SMMU_GR0(smmu_domain->smmu);
+
+ writel_relaxed(smmu_domain->cfg.vmid, base + ARM_SMMU_GR0_TLBIVMID);
+}
+
+static const struct iommu_gather_ops arm_smmu_s1_tlb_ops = {
+ .tlb_flush_all = arm_smmu_tlb_inv_context_s1,
.tlb_add_flush = arm_smmu_tlb_inv_range_nosync,
- .tlb_sync = arm_smmu_tlb_sync,
+ .tlb_sync = arm_smmu_tlb_sync_context,
+};
+
+static const struct iommu_gather_ops arm_smmu_s2_tlb_ops_v2 = {
+ .tlb_flush_all = arm_smmu_tlb_inv_context_s2,
+ .tlb_add_flush = arm_smmu_tlb_inv_range_nosync,
+ .tlb_sync = arm_smmu_tlb_sync_context,
+};
+
+static const struct iommu_gather_ops arm_smmu_s2_tlb_ops_v1 = {
+ .tlb_flush_all = arm_smmu_tlb_inv_context_s2,
+ .tlb_add_flush = arm_smmu_tlb_inv_vmid_nosync,
+ .tlb_sync = arm_smmu_tlb_sync_vmid,
};
static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
@@ -673,7 +716,7 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev)
struct arm_smmu_device *smmu = smmu_domain->smmu;
void __iomem *cb_base;
- cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ cb_base = ARM_SMMU_CB(smmu, cfg->cbndx);
fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR);
if (!(fsr & FSR_FAULT))
@@ -726,7 +769,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain,
gr1_base = ARM_SMMU_GR1(smmu);
stage1 = cfg->cbar != CBAR_TYPE_S2_TRANS;
- cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ cb_base = ARM_SMMU_CB(smmu, cfg->cbndx);
if (smmu->version > ARM_SMMU_V1) {
if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH64)
@@ -735,7 +778,7 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain,
reg = CBA2R_RW64_32BIT;
/* 16-bit VMIDs live in CBA2R */
if (smmu->features & ARM_SMMU_FEAT_VMID16)
- reg |= ARM_SMMU_CB_VMID(smmu, cfg) << CBA2R_VMID_SHIFT;
+ reg |= cfg->vmid << CBA2R_VMID_SHIFT;
writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBA2R(cfg->cbndx));
}
@@ -754,34 +797,15 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain,
(CBAR_S1_MEMATTR_WB << CBAR_S1_MEMATTR_SHIFT);
} else if (!(smmu->features & ARM_SMMU_FEAT_VMID16)) {
/* 8-bit VMIDs live in CBAR */
- reg |= ARM_SMMU_CB_VMID(smmu, cfg) << CBAR_VMID_SHIFT;
+ reg |= cfg->vmid << CBAR_VMID_SHIFT;
}
writel_relaxed(reg, gr1_base + ARM_SMMU_GR1_CBAR(cfg->cbndx));
- /* TTBRs */
- if (stage1) {
- u16 asid = ARM_SMMU_CB_ASID(smmu, cfg);
-
- if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_S) {
- reg = pgtbl_cfg->arm_v7s_cfg.ttbr[0];
- writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0);
- reg = pgtbl_cfg->arm_v7s_cfg.ttbr[1];
- writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR1);
- writel_relaxed(asid, cb_base + ARM_SMMU_CB_CONTEXTIDR);
- } else {
- reg64 = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
- reg64 |= (u64)asid << TTBRn_ASID_SHIFT;
- writeq_relaxed(reg64, cb_base + ARM_SMMU_CB_TTBR0);
- reg64 = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[1];
- reg64 |= (u64)asid << TTBRn_ASID_SHIFT;
- writeq_relaxed(reg64, cb_base + ARM_SMMU_CB_TTBR1);
- }
- } else {
- reg64 = pgtbl_cfg->arm_lpae_s2_cfg.vttbr;
- writeq_relaxed(reg64, cb_base + ARM_SMMU_CB_TTBR0);
- }
-
- /* TTBCR */
+ /*
+ * TTBCR
+ * We must write this before the TTBRs, since it determines the
+ * access behaviour of some fields (in particular, ASID[15:8]).
+ */
if (stage1) {
if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_S) {
reg = pgtbl_cfg->arm_v7s_cfg.tcr;
@@ -800,6 +824,27 @@ static void arm_smmu_init_context_bank(struct arm_smmu_domain *smmu_domain,
}
writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBCR);
+ /* TTBRs */
+ if (stage1) {
+ if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_S) {
+ reg = pgtbl_cfg->arm_v7s_cfg.ttbr[0];
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR0);
+ reg = pgtbl_cfg->arm_v7s_cfg.ttbr[1];
+ writel_relaxed(reg, cb_base + ARM_SMMU_CB_TTBR1);
+ writel_relaxed(cfg->asid, cb_base + ARM_SMMU_CB_CONTEXTIDR);
+ } else {
+ reg64 = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
+ reg64 |= (u64)cfg->asid << TTBRn_ASID_SHIFT;
+ writeq_relaxed(reg64, cb_base + ARM_SMMU_CB_TTBR0);
+ reg64 = pgtbl_cfg->arm_lpae_s1_cfg.ttbr[1];
+ reg64 |= (u64)cfg->asid << TTBRn_ASID_SHIFT;
+ writeq_relaxed(reg64, cb_base + ARM_SMMU_CB_TTBR1);
+ }
+ } else {
+ reg64 = pgtbl_cfg->arm_lpae_s2_cfg.vttbr;
+ writeq_relaxed(reg64, cb_base + ARM_SMMU_CB_TTBR0);
+ }
+
/* MAIRs (stage-1 only) */
if (stage1) {
if (cfg->fmt == ARM_SMMU_CTX_FMT_AARCH32_S) {
@@ -833,11 +878,18 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
enum io_pgtable_fmt fmt;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
+ const struct iommu_gather_ops *tlb_ops;
mutex_lock(&smmu_domain->init_mutex);
if (smmu_domain->smmu)
goto out_unlock;
+ if (domain->type == IOMMU_DOMAIN_IDENTITY) {
+ smmu_domain->stage = ARM_SMMU_DOMAIN_BYPASS;
+ smmu_domain->smmu = smmu;
+ goto out_unlock;
+ }
+
/*
* Mapping the requested stage onto what we support is surprisingly
* complicated, mainly because the spec allows S1+S2 SMMUs without
@@ -904,6 +956,7 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
ias = min(ias, 32UL);
oas = min(oas, 32UL);
}
+ tlb_ops = &arm_smmu_s1_tlb_ops;
break;
case ARM_SMMU_DOMAIN_NESTED:
/*
@@ -922,12 +975,15 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
ias = min(ias, 40UL);
oas = min(oas, 40UL);
}
+ if (smmu->version == ARM_SMMU_V2)
+ tlb_ops = &arm_smmu_s2_tlb_ops_v2;
+ else
+ tlb_ops = &arm_smmu_s2_tlb_ops_v1;
break;
default:
ret = -EINVAL;
goto out_unlock;
}
-
ret = __arm_smmu_alloc_bitmap(smmu->context_map, start,
smmu->num_context_banks);
if (ret < 0)
@@ -941,11 +997,16 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
cfg->irptndx = cfg->cbndx;
}
+ if (smmu_domain->stage == ARM_SMMU_DOMAIN_S2)
+ cfg->vmid = cfg->cbndx + 1 + smmu->cavium_id_base;
+ else
+ cfg->asid = cfg->cbndx + smmu->cavium_id_base;
+
pgtbl_cfg = (struct io_pgtable_cfg) {
.pgsize_bitmap = smmu->pgsize_bitmap,
.ias = ias,
.oas = oas,
- .tlb = &arm_smmu_gather_ops,
+ .tlb = tlb_ops,
.iommu_dev = smmu->dev,
};
@@ -998,14 +1059,14 @@ static void arm_smmu_destroy_domain_context(struct iommu_domain *domain)
void __iomem *cb_base;
int irq;
- if (!smmu)
+ if (!smmu || domain->type == IOMMU_DOMAIN_IDENTITY)
return;
/*
* Disable the context bank and free the page tables before freeing
* it.
*/
- cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ cb_base = ARM_SMMU_CB(smmu, cfg->cbndx);
writel_relaxed(0, cb_base + ARM_SMMU_CB_SCTLR);
if (cfg->irptndx != INVALID_IRPTNDX) {
@@ -1021,7 +1082,9 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
{
struct arm_smmu_domain *smmu_domain;
- if (type != IOMMU_DOMAIN_UNMANAGED && type != IOMMU_DOMAIN_DMA)
+ if (type != IOMMU_DOMAIN_UNMANAGED &&
+ type != IOMMU_DOMAIN_DMA &&
+ type != IOMMU_DOMAIN_IDENTITY)
return NULL;
/*
* Allocate the domain and initialise some of its data structures.
@@ -1250,10 +1313,15 @@ static int arm_smmu_domain_add_master(struct arm_smmu_domain *smmu_domain,
{
struct arm_smmu_device *smmu = smmu_domain->smmu;
struct arm_smmu_s2cr *s2cr = smmu->s2crs;
- enum arm_smmu_s2cr_type type = S2CR_TYPE_TRANS;
u8 cbndx = smmu_domain->cfg.cbndx;
+ enum arm_smmu_s2cr_type type;
int i, idx;
+ if (smmu_domain->stage == ARM_SMMU_DOMAIN_BYPASS)
+ type = S2CR_TYPE_BYPASS;
+ else
+ type = S2CR_TYPE_TRANS;
+
for_each_cfg_sme(fwspec, i, idx) {
if (type == s2cr[idx].type && cbndx == s2cr[idx].cbndx)
continue;
@@ -1356,7 +1424,7 @@ static phys_addr_t arm_smmu_iova_to_phys_hard(struct iommu_domain *domain,
u64 phys;
unsigned long va;
- cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, cfg->cbndx);
+ cb_base = ARM_SMMU_CB(smmu, cfg->cbndx);
/* ATS1 registers can only be written atomically */
va = iova & ~0xfffUL;
@@ -1549,6 +1617,9 @@ static int arm_smmu_domain_get_attr(struct iommu_domain *domain,
{
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
+
switch (attr) {
case DOMAIN_ATTR_NESTING:
*(int *)data = (smmu_domain->stage == ARM_SMMU_DOMAIN_NESTED);
@@ -1564,6 +1635,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
int ret = 0;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ if (domain->type != IOMMU_DOMAIN_UNMANAGED)
+ return -EINVAL;
+
mutex_lock(&smmu_domain->init_mutex);
switch (attr) {
@@ -1590,13 +1664,15 @@ out_unlock:
static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
{
- u32 fwid = 0;
+ u32 mask, fwid = 0;
if (args->args_count > 0)
fwid |= (u16)args->args[0];
if (args->args_count > 1)
fwid |= (u16)args->args[1] << SMR_MASK_SHIFT;
+ else if (!of_property_read_u32(args->np, "stream-match-mask", &mask))
+ fwid |= (u16)mask << SMR_MASK_SHIFT;
return iommu_fwspec_add_ids(dev, &fwid, 1);
}
@@ -1683,7 +1759,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
/* Make sure all context banks are disabled and clear CB_FSR */
for (i = 0; i < smmu->num_context_banks; ++i) {
- cb_base = ARM_SMMU_CB_BASE(smmu) + ARM_SMMU_CB(smmu, i);
+ cb_base = ARM_SMMU_CB(smmu, i);
writel_relaxed(0, cb_base + ARM_SMMU_CB_SCTLR);
writel_relaxed(FSR_FAULT, cb_base + ARM_SMMU_CB_FSR);
/*
@@ -1729,7 +1805,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
reg |= sCR0_EXIDENABLE;
/* Push the button */
- __arm_smmu_tlb_sync(smmu);
+ arm_smmu_tlb_sync_global(smmu);
writel(reg, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
}
@@ -1863,11 +1939,11 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
/* Check for size mismatch of SMMU address space from mapped region */
size = 1 << (((id >> ID1_NUMPAGENDXB_SHIFT) & ID1_NUMPAGENDXB_MASK) + 1);
- size *= 2 << smmu->pgshift;
- if (smmu->size != size)
+ size <<= smmu->pgshift;
+ if (smmu->cb_base != gr0_base + size)
dev_warn(smmu->dev,
- "SMMU address space size (0x%lx) differs from mapped region size (0x%lx)!\n",
- size, smmu->size);
+ "SMMU address space size (0x%lx) differs from mapped region size (0x%tx)!\n",
+ size * 2, (smmu->cb_base - gr0_base) * 2);
smmu->num_s2_context_banks = (id >> ID1_NUMS2CB_SHIFT) & ID1_NUMS2CB_MASK;
smmu->num_context_banks = (id >> ID1_NUMCB_SHIFT) & ID1_NUMCB_MASK;
@@ -1887,6 +1963,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
atomic_add_return(smmu->num_context_banks,
&cavium_smmu_context_count);
smmu->cavium_id_base -= smmu->num_context_banks;
+ dev_notice(smmu->dev, "\tenabling workaround for Cavium erratum 27704\n");
}
/* ID2 */
@@ -2103,7 +2180,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
smmu->base = devm_ioremap_resource(dev, res);
if (IS_ERR(smmu->base))
return PTR_ERR(smmu->base);
- smmu->size = resource_size(res);
+ smmu->cb_base = smmu->base + resource_size(res) / 2;
num_irqs = 0;
while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, num_irqs))) {
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index f9bc6ebb8140..6e5df5e0a3bd 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -74,7 +74,7 @@
/* Calculate the block/page mapping size at level l for pagetable in d. */
#define ARM_LPAE_BLOCK_SIZE(l,d) \
- (1 << (ilog2(sizeof(arm_lpae_iopte)) + \
+ (1ULL << (ilog2(sizeof(arm_lpae_iopte)) + \
((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level)))
/* Page table bits */
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3b67144dead2..770ba7e7ef4d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -36,6 +36,7 @@
static struct kset *iommu_group_kset;
static DEFINE_IDA(iommu_group_ida);
+static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA;
struct iommu_callback_data {
const struct iommu_ops *ops;
@@ -112,6 +113,18 @@ static int __iommu_attach_group(struct iommu_domain *domain,
static void __iommu_detach_group(struct iommu_domain *domain,
struct iommu_group *group);
+static int __init iommu_set_def_domain_type(char *str)
+{
+ bool pt;
+
+ if (!str || strtobool(str, &pt))
+ return -EINVAL;
+
+ iommu_def_domain_type = pt ? IOMMU_DOMAIN_IDENTITY : IOMMU_DOMAIN_DMA;
+ return 0;
+}
+early_param("iommu.passthrough", iommu_set_def_domain_type);
+
static ssize_t iommu_group_attr_show(struct kobject *kobj,
struct attribute *__attr, char *buf)
{
@@ -1015,10 +1028,19 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
* IOMMU driver.
*/
if (!group->default_domain) {
- group->default_domain = __iommu_domain_alloc(dev->bus,
- IOMMU_DOMAIN_DMA);
+ struct iommu_domain *dom;
+
+ dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
+ if (!dom && iommu_def_domain_type != IOMMU_DOMAIN_DMA) {
+ dev_warn(dev,
+ "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
+ iommu_def_domain_type);
+ dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
+ }
+
+ group->default_domain = dom;
if (!group->domain)
- group->domain = group->default_domain;
+ group->domain = dom;
}
ret = iommu_group_add_device(group, dev);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 2e4de0deee53..88ec8c6580d3 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -32,10 +32,13 @@
#define IOMMU_NOEXEC (1 << 3)
#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
/*
- * This is to make the IOMMU API setup privileged
- * mapppings accessible by the master only at higher
- * privileged execution level and inaccessible at
- * less privileged levels.
+ * Where the bus hardware includes a privilege level as part of its access type
+ * markings, and certain devices are capable of issuing transactions marked as
+ * either 'supervisor' or 'user', the IOMMU_PRIV flag requests that the other
+ * given permission flags only apply to accesses at the higher privilege level,
+ * and that unprivileged transactions should have as little access as possible.
+ * This would usually imply the same permissions as kernel mappings on the CPU,
+ * if the IOMMU page table format is equivalent.
*/
#define IOMMU_PRIV (1 << 5)
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-19 18:48:40 +0000