| Message ID | 20210302092644.2553014-8-jean-philippe@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | iommu: I/O page faults for SMMUv3 | expand |
Hi Jean, Reviewed-by: Keqian Zhu <zhukeqian1@huawei.com> On 2021/3/2 17:26, Jean-Philippe Brucker wrote: > When handling faults from the event or PRI queue, we need to find the > struct device associated with a SID. Add a rb_tree to keep track of > SIDs. > > Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > Reviewed-by: Eric Auger <eric.auger@redhat.com> > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 13 +- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 157 ++++++++++++++++---- > 2 files changed, 140 insertions(+), 30 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h > index f985817c967a..7b15b7580c6e 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h > @@ -639,6 +639,15 @@ struct arm_smmu_device { > > /* IOMMU core code handle */ > struct iommu_device iommu; > + > + struct rb_root streams; > + struct mutex streams_mutex; > +}; > + > +struct arm_smmu_stream { > + u32 id; > + struct arm_smmu_master *master; > + struct rb_node node; > }; > > /* SMMU private data for each master */ > @@ -647,8 +656,8 @@ struct arm_smmu_master { > struct device *dev; > struct arm_smmu_domain *domain; > struct list_head domain_head; > - u32 *sids; > - unsigned int num_sids; > + struct arm_smmu_stream *streams; > + unsigned int num_streams; > bool ats_enabled; > bool sva_enabled; > struct list_head bonds; > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > index 7edce914c45e..d148bb6d4289 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -909,8 +909,8 @@ static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain, > > spin_lock_irqsave(&smmu_domain->devices_lock, flags); > list_for_each_entry(master, &smmu_domain->devices, domain_head) { > - for (i = 0; i < master->num_sids; i++) { > - cmd.cfgi.sid = master->sids[i]; > + for (i = 0; i < master->num_streams; i++) { > + cmd.cfgi.sid = master->streams[i].id; > arm_smmu_cmdq_batch_add(smmu, &cmds, &cmd); > } > } > @@ -1355,6 +1355,28 @@ static int arm_smmu_init_l2_strtab(struct arm_smmu_device *smmu, u32 sid) > return 0; > } > > +/* smmu->streams_mutex must be held */ > +__maybe_unused > +static struct arm_smmu_master * > +arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid) > +{ > + struct rb_node *node; > + struct arm_smmu_stream *stream; > + > + node = smmu->streams.rb_node; > + while (node) { > + stream = rb_entry(node, struct arm_smmu_stream, node); > + if (stream->id < sid) > + node = node->rb_right; > + else if (stream->id > sid) > + node = node->rb_left; > + else > + return stream->master; > + } > + > + return NULL; > +} > + > /* IRQ and event handlers */ > static irqreturn_t arm_smmu_evtq_thread(int irq, void *dev) > { > @@ -1588,8 +1610,8 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master) > > arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd); > > - for (i = 0; i < master->num_sids; i++) { > - cmd.atc.sid = master->sids[i]; > + for (i = 0; i < master->num_streams; i++) { > + cmd.atc.sid = master->streams[i].id; > arm_smmu_cmdq_issue_cmd(master->smmu, &cmd); > } > > @@ -1632,8 +1654,8 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid, > if (!master->ats_enabled) > continue; > > - for (i = 0; i < master->num_sids; i++) { > - cmd.atc.sid = master->sids[i]; > + for (i = 0; i < master->num_streams; i++) { > + cmd.atc.sid = master->streams[i].id; > arm_smmu_cmdq_batch_add(smmu_domain->smmu, &cmds, &cmd); > } > } > @@ -2065,13 +2087,13 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master) > int i, j; > struct arm_smmu_device *smmu = master->smmu; > > - for (i = 0; i < master->num_sids; ++i) { > - u32 sid = master->sids[i]; > + for (i = 0; i < master->num_streams; ++i) { > + u32 sid = master->streams[i].id; > __le64 *step = arm_smmu_get_step_for_sid(smmu, sid); > > /* Bridged PCI devices may end up with duplicated IDs */ > for (j = 0; j < i; j++) > - if (master->sids[j] == sid) > + if (master->streams[j].id == sid) > break; > if (j < i) > continue; > @@ -2345,11 +2367,101 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid) > return sid < limit; > } > > +static int arm_smmu_insert_master(struct arm_smmu_device *smmu, > + struct arm_smmu_master *master) > +{ > + int i; > + int ret = 0; > + struct arm_smmu_stream *new_stream, *cur_stream; > + struct rb_node **new_node, *parent_node = NULL; > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev); > + > + master->streams = kcalloc(fwspec->num_ids, sizeof(*master->streams), > + GFP_KERNEL); > + if (!master->streams) > + return -ENOMEM; > + master->num_streams = fwspec->num_ids; > + > + mutex_lock(&smmu->streams_mutex); > + for (i = 0; i < fwspec->num_ids; i++) { > + u32 sid = fwspec->ids[i]; > + > + new_stream = &master->streams[i]; > + new_stream->id = sid; > + new_stream->master = master; > + > + /* > + * Check the SIDs are in range of the SMMU and our stream table > + */ > + if (!arm_smmu_sid_in_range(smmu, sid)) { > + ret = -ERANGE; > + break; > + } > + > + /* Ensure l2 strtab is initialised */ > + if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { > + ret = arm_smmu_init_l2_strtab(smmu, sid); > + if (ret) > + break; > + } > + > + /* Insert into SID tree */ > + new_node = &(smmu->streams.rb_node); > + while (*new_node) { > + cur_stream = rb_entry(*new_node, struct arm_smmu_stream, > + node); > + parent_node = *new_node; > + if (cur_stream->id > new_stream->id) { > + new_node = &((*new_node)->rb_left); > + } else if (cur_stream->id < new_stream->id) { > + new_node = &((*new_node)->rb_right); > + } else { > + dev_warn(master->dev, > + "stream %u already in tree\n", > + cur_stream->id); > + ret = -EINVAL; > + break; > + } > + } > + if (ret) > + break; > + > + rb_link_node(&new_stream->node, parent_node, new_node); > + rb_insert_color(&new_stream->node, &smmu->streams); > + } > + > + if (ret) { > + for (i--; i >= 0; i--) > + rb_erase(&master->streams[i].node, &smmu->streams); > + kfree(master->streams); > + } > + mutex_unlock(&smmu->streams_mutex); > + > + return ret; > +} > + > +static void arm_smmu_remove_master(struct arm_smmu_master *master) > +{ > + int i; > + struct arm_smmu_device *smmu = master->smmu; > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev); > + > + if (!smmu || !master->streams) > + return; > + > + mutex_lock(&smmu->streams_mutex); > + for (i = 0; i < fwspec->num_ids; i++) > + rb_erase(&master->streams[i].node, &smmu->streams); > + mutex_unlock(&smmu->streams_mutex); > + > + kfree(master->streams); > +} > + > static struct iommu_ops arm_smmu_ops; > > static struct iommu_device *arm_smmu_probe_device(struct device *dev) > { > - int i, ret; > + int ret; > struct arm_smmu_device *smmu; > struct arm_smmu_master *master; > struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > @@ -2370,27 +2482,12 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) > > master->dev = dev; > master->smmu = smmu; > - master->sids = fwspec->ids; > - master->num_sids = fwspec->num_ids; > INIT_LIST_HEAD(&master->bonds); > dev_iommu_priv_set(dev, master); > > - /* Check the SIDs are in range of the SMMU and our stream table */ > - for (i = 0; i < master->num_sids; i++) { > - u32 sid = master->sids[i]; > - > - if (!arm_smmu_sid_in_range(smmu, sid)) { > - ret = -ERANGE; > - goto err_free_master; > - } > - > - /* Ensure l2 strtab is initialised */ > - if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { > - ret = arm_smmu_init_l2_strtab(smmu, sid); > - if (ret) > - goto err_free_master; > - } > - } > + ret = arm_smmu_insert_master(smmu, master); > + if (ret) > + goto err_free_master; > > device_property_read_u32(dev, "pasid-num-bits", &master->ssid_bits); > master->ssid_bits = min(smmu->ssid_bits, master->ssid_bits); > @@ -2429,6 +2526,7 @@ static void arm_smmu_release_device(struct device *dev) > WARN_ON(arm_smmu_master_sva_enabled(master)); > arm_smmu_detach_dev(master); > arm_smmu_disable_pasid(master); > + arm_smmu_remove_master(master); > kfree(master); > iommu_fwspec_free(dev); > } > @@ -2852,6 +2950,9 @@ static int arm_smmu_init_structures(struct arm_smmu_device *smmu) > { > int ret; > > + mutex_init(&smmu->streams_mutex); > + smmu->streams = RB_ROOT; > + > ret = arm_smmu_init_queues(smmu); > if (ret) > return ret; >
On Tue, Mar 02, 2021 at 10:26:43AM +0100, Jean-Philippe Brucker wrote: > When handling faults from the event or PRI queue, we need to find the > struct device associated with a SID. Add a rb_tree to keep track of > SIDs. > > Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > Reviewed-by: Eric Auger <eric.auger@redhat.com> > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 13 +- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 157 ++++++++++++++++---- > 2 files changed, 140 insertions(+), 30 deletions(-) > > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h > index f985817c967a..7b15b7580c6e 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h > @@ -639,6 +639,15 @@ struct arm_smmu_device { > > /* IOMMU core code handle */ > struct iommu_device iommu; > + > + struct rb_root streams; > + struct mutex streams_mutex; > +}; > + > +struct arm_smmu_stream { > + u32 id; > + struct arm_smmu_master *master; > + struct rb_node node; > }; > > /* SMMU private data for each master */ > @@ -647,8 +656,8 @@ struct arm_smmu_master { > struct device *dev; > struct arm_smmu_domain *domain; > struct list_head domain_head; > - u32 *sids; > - unsigned int num_sids; > + struct arm_smmu_stream *streams; > + unsigned int num_streams; > bool ats_enabled; > bool sva_enabled; > struct list_head bonds; > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > index 7edce914c45e..d148bb6d4289 100644 > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c > @@ -909,8 +909,8 @@ static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain, > > spin_lock_irqsave(&smmu_domain->devices_lock, flags); > list_for_each_entry(master, &smmu_domain->devices, domain_head) { > - for (i = 0; i < master->num_sids; i++) { > - cmd.cfgi.sid = master->sids[i]; > + for (i = 0; i < master->num_streams; i++) { > + cmd.cfgi.sid = master->streams[i].id; > arm_smmu_cmdq_batch_add(smmu, &cmds, &cmd); > } > } > @@ -1355,6 +1355,28 @@ static int arm_smmu_init_l2_strtab(struct arm_smmu_device *smmu, u32 sid) > return 0; > } > > +/* smmu->streams_mutex must be held */ Can you add a lockdep assertion for that? > +__maybe_unused > +static struct arm_smmu_master * > +arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid) > +{ > + struct rb_node *node; > + struct arm_smmu_stream *stream; > + > + node = smmu->streams.rb_node; > + while (node) { > + stream = rb_entry(node, struct arm_smmu_stream, node); > + if (stream->id < sid) > + node = node->rb_right; > + else if (stream->id > sid) > + node = node->rb_left; > + else > + return stream->master; > + } > + > + return NULL; > +} [...] > +static int arm_smmu_insert_master(struct arm_smmu_device *smmu, > + struct arm_smmu_master *master) > +{ > + int i; > + int ret = 0; > + struct arm_smmu_stream *new_stream, *cur_stream; > + struct rb_node **new_node, *parent_node = NULL; > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev); > + > + master->streams = kcalloc(fwspec->num_ids, sizeof(*master->streams), > + GFP_KERNEL); > + if (!master->streams) > + return -ENOMEM; > + master->num_streams = fwspec->num_ids; > + > + mutex_lock(&smmu->streams_mutex); > + for (i = 0; i < fwspec->num_ids; i++) { > + u32 sid = fwspec->ids[i]; > + > + new_stream = &master->streams[i]; > + new_stream->id = sid; > + new_stream->master = master; > + > + /* > + * Check the SIDs are in range of the SMMU and our stream table > + */ > + if (!arm_smmu_sid_in_range(smmu, sid)) { > + ret = -ERANGE; > + break; > + } > + > + /* Ensure l2 strtab is initialised */ > + if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { > + ret = arm_smmu_init_l2_strtab(smmu, sid); > + if (ret) > + break; > + } > + > + /* Insert into SID tree */ > + new_node = &(smmu->streams.rb_node); > + while (*new_node) { > + cur_stream = rb_entry(*new_node, struct arm_smmu_stream, > + node); > + parent_node = *new_node; > + if (cur_stream->id > new_stream->id) { > + new_node = &((*new_node)->rb_left); > + } else if (cur_stream->id < new_stream->id) { > + new_node = &((*new_node)->rb_right); > + } else { > + dev_warn(master->dev, > + "stream %u already in tree\n", > + cur_stream->id); > + ret = -EINVAL; > + break; > + } > + } > + if (ret) > + break; > + > + rb_link_node(&new_stream->node, parent_node, new_node); > + rb_insert_color(&new_stream->node, &smmu->streams); > + } > + > + if (ret) { > + for (i--; i >= 0; i--) Is 'i--' really what you want for the initial value? Doesn't that correspond to the ID you *didn't* add to the tree? > + rb_erase(&master->streams[i].node, &smmu->streams); > + kfree(master->streams); Do you need to NULLify master->streams and/or reset master->num_streams after this? Seems like they're left dangling. Will
On Thu, Mar 25, 2021 at 05:48:07PM +0000, Will Deacon wrote: > > +/* smmu->streams_mutex must be held */ > > Can you add a lockdep assertion for that? Sure > > +__maybe_unused > > +static struct arm_smmu_master * > > +arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid) > > +{ > > + struct rb_node *node; > > + struct arm_smmu_stream *stream; > > + > > + node = smmu->streams.rb_node; > > + while (node) { > > + stream = rb_entry(node, struct arm_smmu_stream, node); > > + if (stream->id < sid) > > + node = node->rb_right; > > + else if (stream->id > sid) > > + node = node->rb_left; > > + else > > + return stream->master; > > + } > > + > > + return NULL; > > +} > > [...] > > > +static int arm_smmu_insert_master(struct arm_smmu_device *smmu, > > + struct arm_smmu_master *master) > > +{ > > + int i; > > + int ret = 0; > > + struct arm_smmu_stream *new_stream, *cur_stream; > > + struct rb_node **new_node, *parent_node = NULL; > > + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev); > > + > > + master->streams = kcalloc(fwspec->num_ids, sizeof(*master->streams), > > + GFP_KERNEL); > > + if (!master->streams) > > + return -ENOMEM; > > + master->num_streams = fwspec->num_ids; > > + > > + mutex_lock(&smmu->streams_mutex); > > + for (i = 0; i < fwspec->num_ids; i++) { > > + u32 sid = fwspec->ids[i]; > > + > > + new_stream = &master->streams[i]; > > + new_stream->id = sid; > > + new_stream->master = master; > > + > > + /* > > + * Check the SIDs are in range of the SMMU and our stream table > > + */ > > + if (!arm_smmu_sid_in_range(smmu, sid)) { > > + ret = -ERANGE; > > + break; > > + } > > + > > + /* Ensure l2 strtab is initialised */ > > + if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { > > + ret = arm_smmu_init_l2_strtab(smmu, sid); > > + if (ret) > > + break; > > + } > > + > > + /* Insert into SID tree */ > > + new_node = &(smmu->streams.rb_node); > > + while (*new_node) { > > + cur_stream = rb_entry(*new_node, struct arm_smmu_stream, > > + node); > > + parent_node = *new_node; > > + if (cur_stream->id > new_stream->id) { > > + new_node = &((*new_node)->rb_left); > > + } else if (cur_stream->id < new_stream->id) { > > + new_node = &((*new_node)->rb_right); > > + } else { > > + dev_warn(master->dev, > > + "stream %u already in tree\n", > > + cur_stream->id); > > + ret = -EINVAL; > > + break; > > + } > > + } > > + if (ret) > > + break; > > + > > + rb_link_node(&new_stream->node, parent_node, new_node); > > + rb_insert_color(&new_stream->node, &smmu->streams); > > + } > > + > > + if (ret) { > > + for (i--; i >= 0; i--) > > Is 'i--' really what you want for the initial value? Doesn't that correspond > to the ID you *didn't* add to the tree? In case of error we break out of the loop, with i corresponding to the stream that caused a fault but wasn't yet added to the tree. So i-- is the last stream that was successfully added, or -1 in which case we don't enter this for loop. > > + rb_erase(&master->streams[i].node, &smmu->streams); > > + kfree(master->streams); > > Do you need to NULLify master->streams and/or reset master->num_streams > after this? Seems like they're left dangling. master is freed by arm_smmu_probe_device() when we return an error. Since this function is unlikely to ever have another caller I didn't bother cleaning up here Thanks, Jean
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index f985817c967a..7b15b7580c6e 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -639,6 +639,15 @@ struct arm_smmu_device { /* IOMMU core code handle */ struct iommu_device iommu; + + struct rb_root streams; + struct mutex streams_mutex; +}; + +struct arm_smmu_stream { + u32 id; + struct arm_smmu_master *master; + struct rb_node node; }; /* SMMU private data for each master */ @@ -647,8 +656,8 @@ struct arm_smmu_master { struct device *dev; struct arm_smmu_domain *domain; struct list_head domain_head; - u32 *sids; - unsigned int num_sids; + struct arm_smmu_stream *streams; + unsigned int num_streams; bool ats_enabled; bool sva_enabled; struct list_head bonds; diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c index 7edce914c45e..d148bb6d4289 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -909,8 +909,8 @@ static void arm_smmu_sync_cd(struct arm_smmu_domain *smmu_domain, spin_lock_irqsave(&smmu_domain->devices_lock, flags); list_for_each_entry(master, &smmu_domain->devices, domain_head) { - for (i = 0; i < master->num_sids; i++) { - cmd.cfgi.sid = master->sids[i]; + for (i = 0; i < master->num_streams; i++) { + cmd.cfgi.sid = master->streams[i].id; arm_smmu_cmdq_batch_add(smmu, &cmds, &cmd); } } @@ -1355,6 +1355,28 @@ static int arm_smmu_init_l2_strtab(struct arm_smmu_device *smmu, u32 sid) return 0; } +/* smmu->streams_mutex must be held */ +__maybe_unused +static struct arm_smmu_master * +arm_smmu_find_master(struct arm_smmu_device *smmu, u32 sid) +{ + struct rb_node *node; + struct arm_smmu_stream *stream; + + node = smmu->streams.rb_node; + while (node) { + stream = rb_entry(node, struct arm_smmu_stream, node); + if (stream->id < sid) + node = node->rb_right; + else if (stream->id > sid) + node = node->rb_left; + else + return stream->master; + } + + return NULL; +} + /* IRQ and event handlers */ static irqreturn_t arm_smmu_evtq_thread(int irq, void *dev) { @@ -1588,8 +1610,8 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master) arm_smmu_atc_inv_to_cmd(0, 0, 0, &cmd); - for (i = 0; i < master->num_sids; i++) { - cmd.atc.sid = master->sids[i]; + for (i = 0; i < master->num_streams; i++) { + cmd.atc.sid = master->streams[i].id; arm_smmu_cmdq_issue_cmd(master->smmu, &cmd); } @@ -1632,8 +1654,8 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid, if (!master->ats_enabled) continue; - for (i = 0; i < master->num_sids; i++) { - cmd.atc.sid = master->sids[i]; + for (i = 0; i < master->num_streams; i++) { + cmd.atc.sid = master->streams[i].id; arm_smmu_cmdq_batch_add(smmu_domain->smmu, &cmds, &cmd); } } @@ -2065,13 +2087,13 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master) int i, j; struct arm_smmu_device *smmu = master->smmu; - for (i = 0; i < master->num_sids; ++i) { - u32 sid = master->sids[i]; + for (i = 0; i < master->num_streams; ++i) { + u32 sid = master->streams[i].id; __le64 *step = arm_smmu_get_step_for_sid(smmu, sid); /* Bridged PCI devices may end up with duplicated IDs */ for (j = 0; j < i; j++) - if (master->sids[j] == sid) + if (master->streams[j].id == sid) break; if (j < i) continue; @@ -2345,11 +2367,101 @@ static bool arm_smmu_sid_in_range(struct arm_smmu_device *smmu, u32 sid) return sid < limit; } +static int arm_smmu_insert_master(struct arm_smmu_device *smmu, + struct arm_smmu_master *master) +{ + int i; + int ret = 0; + struct arm_smmu_stream *new_stream, *cur_stream; + struct rb_node **new_node, *parent_node = NULL; + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev); + + master->streams = kcalloc(fwspec->num_ids, sizeof(*master->streams), + GFP_KERNEL); + if (!master->streams) + return -ENOMEM; + master->num_streams = fwspec->num_ids; + + mutex_lock(&smmu->streams_mutex); + for (i = 0; i < fwspec->num_ids; i++) { + u32 sid = fwspec->ids[i]; + + new_stream = &master->streams[i]; + new_stream->id = sid; + new_stream->master = master; + + /* + * Check the SIDs are in range of the SMMU and our stream table + */ + if (!arm_smmu_sid_in_range(smmu, sid)) { + ret = -ERANGE; + break; + } + + /* Ensure l2 strtab is initialised */ + if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { + ret = arm_smmu_init_l2_strtab(smmu, sid); + if (ret) + break; + } + + /* Insert into SID tree */ + new_node = &(smmu->streams.rb_node); + while (*new_node) { + cur_stream = rb_entry(*new_node, struct arm_smmu_stream, + node); + parent_node = *new_node; + if (cur_stream->id > new_stream->id) { + new_node = &((*new_node)->rb_left); + } else if (cur_stream->id < new_stream->id) { + new_node = &((*new_node)->rb_right); + } else { + dev_warn(master->dev, + "stream %u already in tree\n", + cur_stream->id); + ret = -EINVAL; + break; + } + } + if (ret) + break; + + rb_link_node(&new_stream->node, parent_node, new_node); + rb_insert_color(&new_stream->node, &smmu->streams); + } + + if (ret) { + for (i--; i >= 0; i--) + rb_erase(&master->streams[i].node, &smmu->streams); + kfree(master->streams); + } + mutex_unlock(&smmu->streams_mutex); + + return ret; +} + +static void arm_smmu_remove_master(struct arm_smmu_master *master) +{ + int i; + struct arm_smmu_device *smmu = master->smmu; + struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(master->dev); + + if (!smmu || !master->streams) + return; + + mutex_lock(&smmu->streams_mutex); + for (i = 0; i < fwspec->num_ids; i++) + rb_erase(&master->streams[i].node, &smmu->streams); + mutex_unlock(&smmu->streams_mutex); + + kfree(master->streams); +} + static struct iommu_ops arm_smmu_ops; static struct iommu_device *arm_smmu_probe_device(struct device *dev) { - int i, ret; + int ret; struct arm_smmu_device *smmu; struct arm_smmu_master *master; struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); @@ -2370,27 +2482,12 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev) master->dev = dev; master->smmu = smmu; - master->sids = fwspec->ids; - master->num_sids = fwspec->num_ids; INIT_LIST_HEAD(&master->bonds); dev_iommu_priv_set(dev, master); - /* Check the SIDs are in range of the SMMU and our stream table */ - for (i = 0; i < master->num_sids; i++) { - u32 sid = master->sids[i]; - - if (!arm_smmu_sid_in_range(smmu, sid)) { - ret = -ERANGE; - goto err_free_master; - } - - /* Ensure l2 strtab is initialised */ - if (smmu->features & ARM_SMMU_FEAT_2_LVL_STRTAB) { - ret = arm_smmu_init_l2_strtab(smmu, sid); - if (ret) - goto err_free_master; - } - } + ret = arm_smmu_insert_master(smmu, master); + if (ret) + goto err_free_master; device_property_read_u32(dev, "pasid-num-bits", &master->ssid_bits); master->ssid_bits = min(smmu->ssid_bits, master->ssid_bits); @@ -2429,6 +2526,7 @@ static void arm_smmu_release_device(struct device *dev) WARN_ON(arm_smmu_master_sva_enabled(master)); arm_smmu_detach_dev(master); arm_smmu_disable_pasid(master); + arm_smmu_remove_master(master); kfree(master); iommu_fwspec_free(dev); } @@ -2852,6 +2950,9 @@ static int arm_smmu_init_structures(struct arm_smmu_device *smmu) { int ret; + mutex_init(&smmu->streams_mutex); + smmu->streams = RB_ROOT; + ret = arm_smmu_init_queues(smmu); if (ret) return ret;