IB/mlx5: Page faults handling infrastructure
* Refactor MR registration and cleanup, and fix reg_pages accounting. * Create a work queue to handle page fault events in a kthread context. * Register a fault handler to get events from the core for each QP. The registered fault handler is empty in this patch, and only a later patch implements it. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Shachar Raindel <raindel@mellanox.com> Signed-off-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Haggai Eran
Roland Dreier
Родитель
832a6b06ab
Коммит
6aec21f6a8
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@ -864,7 +864,7 @@ static ssize_t show_reg_pages(struct device *device,
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struct mlx5_ib_dev *dev =
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container_of(device, struct mlx5_ib_dev, ib_dev.dev);
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return sprintf(buf, "%d\n", dev->mdev->priv.reg_pages);
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return sprintf(buf, "%d\n", atomic_read(&dev->mdev->priv.reg_pages));
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}
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static ssize_t show_hca(struct device *device, struct device_attribute *attr,
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@ -1389,16 +1389,19 @@ static void *mlx5_ib_add(struct mlx5_core_dev *mdev)
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goto err_eqs;
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mutex_init(&dev->cap_mask_mutex);
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spin_lock_init(&dev->mr_lock);
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err = create_dev_resources(&dev->devr);
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if (err)
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goto err_eqs;
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err = ib_register_device(&dev->ib_dev, NULL);
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err = mlx5_ib_odp_init_one(dev);
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if (err)
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goto err_rsrc;
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err = ib_register_device(&dev->ib_dev, NULL);
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if (err)
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goto err_odp;
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err = create_umr_res(dev);
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if (err)
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goto err_dev;
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@ -1420,6 +1423,9 @@ err_umrc:
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err_dev:
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ib_unregister_device(&dev->ib_dev);
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err_odp:
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mlx5_ib_odp_remove_one(dev);
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err_rsrc:
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destroy_dev_resources(&dev->devr);
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@ -1435,8 +1441,10 @@ err_dealloc:
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static void mlx5_ib_remove(struct mlx5_core_dev *mdev, void *context)
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{
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struct mlx5_ib_dev *dev = context;
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ib_unregister_device(&dev->ib_dev);
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destroy_umrc_res(dev);
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mlx5_ib_odp_remove_one(dev);
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destroy_dev_resources(&dev->devr);
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free_comp_eqs(dev);
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ib_dealloc_device(&dev->ib_dev);
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@ -1450,15 +1458,30 @@ static struct mlx5_interface mlx5_ib_interface = {
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static int __init mlx5_ib_init(void)
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{
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int err;
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if (deprecated_prof_sel != 2)
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pr_warn("prof_sel is deprecated for mlx5_ib, set it for mlx5_core\n");
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return mlx5_register_interface(&mlx5_ib_interface);
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err = mlx5_ib_odp_init();
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if (err)
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return err;
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err = mlx5_register_interface(&mlx5_ib_interface);
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if (err)
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goto clean_odp;
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return err;
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clean_odp:
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mlx5_ib_odp_cleanup();
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return err;
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}
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static void __exit mlx5_ib_cleanup(void)
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{
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mlx5_unregister_interface(&mlx5_ib_interface);
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mlx5_ib_odp_cleanup();
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}
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module_init(mlx5_ib_init);
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@ -149,6 +149,29 @@ enum {
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MLX5_QP_EMPTY
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};
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/*
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* Connect-IB can trigger up to four concurrent pagefaults
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* per-QP.
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*/
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enum mlx5_ib_pagefault_context {
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MLX5_IB_PAGEFAULT_RESPONDER_READ,
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MLX5_IB_PAGEFAULT_REQUESTOR_READ,
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MLX5_IB_PAGEFAULT_RESPONDER_WRITE,
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MLX5_IB_PAGEFAULT_REQUESTOR_WRITE,
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MLX5_IB_PAGEFAULT_CONTEXTS
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};
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static inline enum mlx5_ib_pagefault_context
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mlx5_ib_get_pagefault_context(struct mlx5_pagefault *pagefault)
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{
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return pagefault->flags & (MLX5_PFAULT_REQUESTOR | MLX5_PFAULT_WRITE);
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}
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struct mlx5_ib_pfault {
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struct work_struct work;
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struct mlx5_pagefault mpfault;
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};
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struct mlx5_ib_qp {
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struct ib_qp ibqp;
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struct mlx5_core_qp mqp;
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@ -194,6 +217,21 @@ struct mlx5_ib_qp {
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/* Store signature errors */
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bool signature_en;
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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/*
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* A flag that is true for QP's that are in a state that doesn't
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* allow page faults, and shouldn't schedule any more faults.
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*/
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int disable_page_faults;
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/*
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* The disable_page_faults_lock protects a QP's disable_page_faults
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* field, allowing for a thread to atomically check whether the QP
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* allows page faults, and if so schedule a page fault.
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*/
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spinlock_t disable_page_faults_lock;
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struct mlx5_ib_pfault pagefaults[MLX5_IB_PAGEFAULT_CONTEXTS];
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#endif
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};
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struct mlx5_ib_cq_buf {
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@ -392,13 +430,17 @@ struct mlx5_ib_dev {
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struct umr_common umrc;
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/* sync used page count stats
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*/
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spinlock_t mr_lock;
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struct mlx5_ib_resources devr;
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struct mlx5_mr_cache cache;
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struct timer_list delay_timer;
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int fill_delay;
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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struct ib_odp_caps odp_caps;
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/*
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* Sleepable RCU that prevents destruction of MRs while they are still
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* being used by a page fault handler.
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*/
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struct srcu_struct mr_srcu;
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#endif
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};
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@ -575,12 +617,33 @@ int mlx5_ib_check_mr_status(struct ib_mr *ibmr, u32 check_mask,
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struct ib_mr_status *mr_status);
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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extern struct workqueue_struct *mlx5_ib_page_fault_wq;
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int mlx5_ib_internal_query_odp_caps(struct mlx5_ib_dev *dev);
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#else
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void mlx5_ib_mr_pfault_handler(struct mlx5_ib_qp *qp,
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struct mlx5_ib_pfault *pfault);
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void mlx5_ib_odp_create_qp(struct mlx5_ib_qp *qp);
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int mlx5_ib_odp_init_one(struct mlx5_ib_dev *ibdev);
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void mlx5_ib_odp_remove_one(struct mlx5_ib_dev *ibdev);
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int __init mlx5_ib_odp_init(void);
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void mlx5_ib_odp_cleanup(void);
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void mlx5_ib_qp_disable_pagefaults(struct mlx5_ib_qp *qp);
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void mlx5_ib_qp_enable_pagefaults(struct mlx5_ib_qp *qp);
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#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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static inline int mlx5_ib_internal_query_odp_caps(struct mlx5_ib_dev *dev)
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{
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return 0;
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}
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static inline void mlx5_ib_odp_create_qp(struct mlx5_ib_qp *qp) {}
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static inline int mlx5_ib_odp_init_one(struct mlx5_ib_dev *ibdev) { return 0; }
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static inline void mlx5_ib_odp_remove_one(struct mlx5_ib_dev *ibdev) {}
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static inline int mlx5_ib_odp_init(void) { return 0; }
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static inline void mlx5_ib_odp_cleanup(void) {}
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static inline void mlx5_ib_qp_disable_pagefaults(struct mlx5_ib_qp *qp) {}
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static inline void mlx5_ib_qp_enable_pagefaults(struct mlx5_ib_qp *qp) {}
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#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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static inline void init_query_mad(struct ib_smp *mad)
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@ -52,6 +52,8 @@ static __be64 mlx5_ib_update_mtt_emergency_buffer[
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static DEFINE_MUTEX(mlx5_ib_update_mtt_emergency_buffer_mutex);
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#endif
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static int clean_mr(struct mlx5_ib_mr *mr);
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static int order2idx(struct mlx5_ib_dev *dev, int order)
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{
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struct mlx5_mr_cache *cache = &dev->cache;
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@ -1049,6 +1051,10 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
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mlx5_ib_dbg(dev, "cache empty for order %d", order);
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mr = NULL;
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}
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} else if (access_flags & IB_ACCESS_ON_DEMAND) {
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err = -EINVAL;
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pr_err("Got MR registration for ODP MR > 512MB, not supported for Connect-IB");
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goto error;
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}
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if (!mr)
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@ -1064,9 +1070,7 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
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mr->umem = umem;
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mr->npages = npages;
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spin_lock(&dev->mr_lock);
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dev->mdev->priv.reg_pages += npages;
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spin_unlock(&dev->mr_lock);
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atomic_add(npages, &dev->mdev->priv.reg_pages);
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mr->ibmr.lkey = mr->mmr.key;
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mr->ibmr.rkey = mr->mmr.key;
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@ -1110,12 +1114,9 @@ error:
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return err;
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}
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int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
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static int clean_mr(struct mlx5_ib_mr *mr)
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{
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struct mlx5_ib_dev *dev = to_mdev(ibmr->device);
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struct mlx5_ib_mr *mr = to_mmr(ibmr);
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struct ib_umem *umem = mr->umem;
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int npages = mr->npages;
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struct mlx5_ib_dev *dev = to_mdev(mr->ibmr.device);
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int umred = mr->umred;
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int err;
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@ -1135,19 +1136,35 @@ int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
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free_cached_mr(dev, mr);
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}
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if (umem) {
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ib_umem_release(umem);
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spin_lock(&dev->mr_lock);
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dev->mdev->priv.reg_pages -= npages;
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spin_unlock(&dev->mr_lock);
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}
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if (!umred)
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kfree(mr);
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return 0;
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}
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int mlx5_ib_dereg_mr(struct ib_mr *ibmr)
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{
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struct mlx5_ib_dev *dev = to_mdev(ibmr->device);
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struct mlx5_ib_mr *mr = to_mmr(ibmr);
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int npages = mr->npages;
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struct ib_umem *umem = mr->umem;
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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if (umem)
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/* Wait for all running page-fault handlers to finish. */
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synchronize_srcu(&dev->mr_srcu);
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#endif
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clean_mr(mr);
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if (umem) {
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ib_umem_release(umem);
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atomic_sub(npages, &dev->mdev->priv.reg_pages);
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}
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return 0;
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}
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struct ib_mr *mlx5_ib_create_mr(struct ib_pd *pd,
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struct ib_mr_init_attr *mr_init_attr)
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{
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@ -32,6 +32,8 @@
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#include "mlx5_ib.h"
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struct workqueue_struct *mlx5_ib_page_fault_wq;
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#define COPY_ODP_BIT_MLX_TO_IB(reg, ib_caps, field_name, bit_name) do { \
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if (be32_to_cpu(reg.field_name) & MLX5_ODP_SUPPORT_##bit_name) \
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ib_caps->field_name |= IB_ODP_SUPPORT_##bit_name; \
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@ -58,3 +60,146 @@ int mlx5_ib_internal_query_odp_caps(struct mlx5_ib_dev *dev)
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out:
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return err;
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}
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static struct mlx5_ib_mr *mlx5_ib_odp_find_mr_lkey(struct mlx5_ib_dev *dev,
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u32 key)
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{
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u32 base_key = mlx5_base_mkey(key);
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struct mlx5_core_mr *mmr = __mlx5_mr_lookup(dev->mdev, base_key);
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if (!mmr || mmr->key != key)
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return NULL;
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return container_of(mmr, struct mlx5_ib_mr, mmr);
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}
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static void mlx5_ib_page_fault_resume(struct mlx5_ib_qp *qp,
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struct mlx5_ib_pfault *pfault,
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int error) {
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struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.pd->device);
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int ret = mlx5_core_page_fault_resume(dev->mdev, qp->mqp.qpn,
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pfault->mpfault.flags,
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error);
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if (ret)
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pr_err("Failed to resolve the page fault on QP 0x%x\n",
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qp->mqp.qpn);
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}
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void mlx5_ib_mr_pfault_handler(struct mlx5_ib_qp *qp,
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struct mlx5_ib_pfault *pfault)
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{
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u8 event_subtype = pfault->mpfault.event_subtype;
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switch (event_subtype) {
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default:
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pr_warn("Invalid page fault event subtype: 0x%x\n",
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event_subtype);
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mlx5_ib_page_fault_resume(qp, pfault, 1);
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break;
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}
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}
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static void mlx5_ib_qp_pfault_action(struct work_struct *work)
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{
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struct mlx5_ib_pfault *pfault = container_of(work,
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struct mlx5_ib_pfault,
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work);
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enum mlx5_ib_pagefault_context context =
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mlx5_ib_get_pagefault_context(&pfault->mpfault);
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struct mlx5_ib_qp *qp = container_of(pfault, struct mlx5_ib_qp,
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pagefaults[context]);
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mlx5_ib_mr_pfault_handler(qp, pfault);
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}
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void mlx5_ib_qp_disable_pagefaults(struct mlx5_ib_qp *qp)
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{
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unsigned long flags;
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spin_lock_irqsave(&qp->disable_page_faults_lock, flags);
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qp->disable_page_faults = 1;
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spin_unlock_irqrestore(&qp->disable_page_faults_lock, flags);
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/*
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* Note that at this point, we are guarenteed that no more
|
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* work queue elements will be posted to the work queue with
|
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* the QP we are closing.
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*/
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flush_workqueue(mlx5_ib_page_fault_wq);
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}
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|
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void mlx5_ib_qp_enable_pagefaults(struct mlx5_ib_qp *qp)
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{
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unsigned long flags;
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|
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spin_lock_irqsave(&qp->disable_page_faults_lock, flags);
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qp->disable_page_faults = 0;
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spin_unlock_irqrestore(&qp->disable_page_faults_lock, flags);
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}
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static void mlx5_ib_pfault_handler(struct mlx5_core_qp *qp,
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struct mlx5_pagefault *pfault)
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{
|
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/*
|
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* Note that we will only get one fault event per QP per context
|
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* (responder/initiator, read/write), until we resolve the page fault
|
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* with the mlx5_ib_page_fault_resume command. Since this function is
|
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* called from within the work element, there is no risk of missing
|
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* events.
|
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*/
|
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struct mlx5_ib_qp *mibqp = to_mibqp(qp);
|
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enum mlx5_ib_pagefault_context context =
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mlx5_ib_get_pagefault_context(pfault);
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struct mlx5_ib_pfault *qp_pfault = &mibqp->pagefaults[context];
|
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|
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qp_pfault->mpfault = *pfault;
|
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|
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/* No need to stop interrupts here since we are in an interrupt */
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spin_lock(&mibqp->disable_page_faults_lock);
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if (!mibqp->disable_page_faults)
|
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queue_work(mlx5_ib_page_fault_wq, &qp_pfault->work);
|
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spin_unlock(&mibqp->disable_page_faults_lock);
|
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}
|
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|
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void mlx5_ib_odp_create_qp(struct mlx5_ib_qp *qp)
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{
|
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int i;
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|
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qp->disable_page_faults = 1;
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spin_lock_init(&qp->disable_page_faults_lock);
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|
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qp->mqp.pfault_handler = mlx5_ib_pfault_handler;
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|
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for (i = 0; i < MLX5_IB_PAGEFAULT_CONTEXTS; ++i)
|
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INIT_WORK(&qp->pagefaults[i].work, mlx5_ib_qp_pfault_action);
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}
|
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|
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int mlx5_ib_odp_init_one(struct mlx5_ib_dev *ibdev)
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{
|
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int ret;
|
||||
|
||||
ret = init_srcu_struct(&ibdev->mr_srcu);
|
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if (ret)
|
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return ret;
|
||||
|
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return 0;
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}
|
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|
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void mlx5_ib_odp_remove_one(struct mlx5_ib_dev *ibdev)
|
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{
|
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cleanup_srcu_struct(&ibdev->mr_srcu);
|
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}
|
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|
||||
int __init mlx5_ib_odp_init(void)
|
||||
{
|
||||
mlx5_ib_page_fault_wq =
|
||||
create_singlethread_workqueue("mlx5_ib_page_faults");
|
||||
if (!mlx5_ib_page_fault_wq)
|
||||
return -ENOMEM;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void mlx5_ib_odp_cleanup(void)
|
||||
{
|
||||
destroy_workqueue(mlx5_ib_page_fault_wq);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -876,6 +876,8 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
|
|||
int inlen = sizeof(*in);
|
||||
int err;
|
||||
|
||||
mlx5_ib_odp_create_qp(qp);
|
||||
|
||||
gen = &dev->mdev->caps.gen;
|
||||
mutex_init(&qp->mutex);
|
||||
spin_lock_init(&qp->sq.lock);
|
||||
|
|
@ -1160,11 +1162,13 @@ static void destroy_qp_common(struct mlx5_ib_dev *dev, struct mlx5_ib_qp *qp)
|
|||
in = kzalloc(sizeof(*in), GFP_KERNEL);
|
||||
if (!in)
|
||||
return;
|
||||
if (qp->state != IB_QPS_RESET)
|
||||
if (qp->state != IB_QPS_RESET) {
|
||||
mlx5_ib_qp_disable_pagefaults(qp);
|
||||
if (mlx5_core_qp_modify(dev->mdev, to_mlx5_state(qp->state),
|
||||
MLX5_QP_STATE_RST, in, sizeof(*in), &qp->mqp))
|
||||
mlx5_ib_warn(dev, "mlx5_ib: modify QP %06x to RESET failed\n",
|
||||
qp->mqp.qpn);
|
||||
}
|
||||
|
||||
get_cqs(qp, &send_cq, &recv_cq);
|
||||
|
||||
|
|
@ -1712,6 +1716,15 @@ static int __mlx5_ib_modify_qp(struct ib_qp *ibqp,
|
|||
if (mlx5_st < 0)
|
||||
goto out;
|
||||
|
||||
/* If moving to a reset or error state, we must disable page faults on
|
||||
* this QP and flush all current page faults. Otherwise a stale page
|
||||
* fault may attempt to work on this QP after it is reset and moved
|
||||
* again to RTS, and may cause the driver and the device to get out of
|
||||
* sync. */
|
||||
if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
|
||||
(new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
|
||||
mlx5_ib_qp_disable_pagefaults(qp);
|
||||
|
||||
optpar = ib_mask_to_mlx5_opt(attr_mask);
|
||||
optpar &= opt_mask[mlx5_cur][mlx5_new][mlx5_st];
|
||||
in->optparam = cpu_to_be32(optpar);
|
||||
|
|
@ -1721,6 +1734,9 @@ static int __mlx5_ib_modify_qp(struct ib_qp *ibqp,
|
|||
if (err)
|
||||
goto out;
|
||||
|
||||
if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
|
||||
mlx5_ib_qp_enable_pagefaults(qp);
|
||||
|
||||
qp->state = new_state;
|
||||
|
||||
if (attr_mask & IB_QP_ACCESS_FLAGS)
|
||||
|
|
@ -3026,6 +3042,14 @@ int mlx5_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr
|
|||
int mlx5_state;
|
||||
int err = 0;
|
||||
|
||||
#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
|
||||
/*
|
||||
* Wait for any outstanding page faults, in case the user frees memory
|
||||
* based upon this query's result.
|
||||
*/
|
||||
flush_workqueue(mlx5_ib_page_fault_wq);
|
||||
#endif
|
||||
|
||||
mutex_lock(&qp->mutex);
|
||||
outb = kzalloc(sizeof(*outb), GFP_KERNEL);
|
||||
if (!outb) {
|
||||
|
|
|
|||
|
|
@ -474,7 +474,7 @@ struct mlx5_priv {
|
|||
struct workqueue_struct *pg_wq;
|
||||
struct rb_root page_root;
|
||||
int fw_pages;
|
||||
int reg_pages;
|
||||
atomic_t reg_pages;
|
||||
struct list_head free_list;
|
||||
|
||||
struct mlx5_core_health health;
|
||||
|
|
|
|||
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