[PATCH v13 07/10] iommu/arm-smmu-v3: Maintain a SID->device structure
Keqian Zhu
zhukeqian1 at huawei.com
Tue Mar 2 12:24:06 GMT 2021
Hi Jean,
Reviewed-by: Keqian Zhu <zhukeqian1 at 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 at huawei.com>
> Reviewed-by: Eric Auger <eric.auger at redhat.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe at 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;
>
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