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Message-ID: <20190610233733.12155-7-saeedm@mellanox.com>
Date: Mon, 10 Jun 2019 23:38:23 +0000
From: Saeed Mahameed <saeedm@...lanox.com>
To: Saeed Mahameed <saeedm@...lanox.com>,
Leon Romanovsky <leonro@...lanox.com>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Yuval Avnery <yuvalav@...lanox.com>,
Parav Pandit <parav@...lanox.com>
Subject: [PATCH mlx5-next 06/16] net/mlx5: Change interrupt handler to call
chain notifier
From: Yuval Avnery <yuvalav@...lanox.com>
Multiple EQs may share the same IRQ in subsequent patches.
Instead of calling the IRQ handler directly, the EQ will register
to an atomic chain notfier.
The Linux built-in shared IRQ is not used because it forces the caller
to disable the IRQ and clear affinity before free_irq() can be called.
This patch is the first step in the separation of IRQ and EQ logic.
Signed-off-by: Yuval Avnery <yuvalav@...lanox.com>
Reviewed-by: Parav Pandit <parav@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
drivers/infiniband/hw/mlx5/mlx5_ib.h | 1 +
drivers/infiniband/hw/mlx5/odp.c | 10 +-
drivers/net/ethernet/mellanox/mlx5/core/eq.c | 138 +++++++++++-------
.../net/ethernet/mellanox/mlx5/core/lib/eq.h | 9 +-
include/linux/mlx5/eq.h | 3 +-
5 files changed, 105 insertions(+), 56 deletions(-)
diff --git a/drivers/infiniband/hw/mlx5/mlx5_ib.h b/drivers/infiniband/hw/mlx5/mlx5_ib.h
index 40eb8be482e4..a043af7ee366 100644
--- a/drivers/infiniband/hw/mlx5/mlx5_ib.h
+++ b/drivers/infiniband/hw/mlx5/mlx5_ib.h
@@ -920,6 +920,7 @@ struct mlx5_ib_lb_state {
};
struct mlx5_ib_pf_eq {
+ struct notifier_block irq_nb;
struct mlx5_ib_dev *dev;
struct mlx5_eq *core;
struct work_struct work;
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index 91507a2e9290..ac40a4fd5598 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -1488,9 +1488,11 @@ static void mlx5_ib_eq_pf_process(struct mlx5_ib_pf_eq *eq)
mlx5_eq_update_ci(eq->core, cc, 1);
}
-static irqreturn_t mlx5_ib_eq_pf_int(int irq, void *eq_ptr)
+static int mlx5_ib_eq_pf_int(struct notifier_block *nb, unsigned long type,
+ void *data)
{
- struct mlx5_ib_pf_eq *eq = eq_ptr;
+ struct mlx5_ib_pf_eq *eq =
+ container_of(nb, struct mlx5_ib_pf_eq, irq_nb);
unsigned long flags;
if (spin_trylock_irqsave(&eq->lock, flags)) {
@@ -1553,12 +1555,12 @@ mlx5_ib_create_pf_eq(struct mlx5_ib_dev *dev, struct mlx5_ib_pf_eq *eq)
goto err_mempool;
}
+ eq->irq_nb.notifier_call = mlx5_ib_eq_pf_int;
param = (struct mlx5_eq_param) {
.index = MLX5_EQ_PFAULT_IDX,
.mask = 1 << MLX5_EVENT_TYPE_PAGE_FAULT,
.nent = MLX5_IB_NUM_PF_EQE,
- .context = eq,
- .handler = mlx5_ib_eq_pf_int
+ .nb = &eq->irq_nb,
};
eq->core = mlx5_eq_create_generic(dev->mdev, "mlx5_ib_page_fault_eq", ¶m);
if (IS_ERR(eq->core)) {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 28defeaca80a..590c0fefaa25 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -72,16 +72,16 @@ enum {
static_assert(MLX5_EQ_POLLING_BUDGET <= MLX5_NUM_SPARE_EQE);
struct mlx5_irq_info {
+ struct atomic_notifier_head nh;
cpumask_var_t mask;
char name[MLX5_MAX_IRQ_NAME];
- void *context; /* dev_id provided to request_irq */
};
struct mlx5_eq_table {
struct list_head comp_eqs_list;
- struct mlx5_eq pages_eq;
- struct mlx5_eq cmd_eq;
- struct mlx5_eq async_eq;
+ struct mlx5_eq_async pages_eq;
+ struct mlx5_eq_async cmd_eq;
+ struct mlx5_eq_async async_eq;
struct atomic_notifier_head nh[MLX5_EVENT_TYPE_MAX];
@@ -109,6 +109,31 @@ struct mlx5_eq_table {
(1ull << MLX5_EVENT_TYPE_SRQ_LAST_WQE) | \
(1ull << MLX5_EVENT_TYPE_SRQ_RQ_LIMIT))
+static struct mlx5_irq_info *mlx5_irq_get(struct mlx5_core_dev *dev, int vecidx)
+{
+ struct mlx5_eq_table *eq_table = dev->priv.eq_table;
+
+ return &eq_table->irq_info[vecidx];
+}
+
+static int mlx5_irq_attach_nb(struct mlx5_irq_info *irq,
+ struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&irq->nh, nb);
+}
+
+static int mlx5_irq_detach_nb(struct mlx5_irq_info *irq,
+ struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&irq->nh, nb);
+}
+
+static irqreturn_t mlx5_irq_int_handler(int irq, void *nh)
+{
+ atomic_notifier_call_chain(nh, 0, NULL);
+ return IRQ_HANDLED;
+}
+
static int mlx5_cmd_destroy_eq(struct mlx5_core_dev *dev, u8 eqn)
{
u32 out[MLX5_ST_SZ_DW(destroy_eq_out)] = {0};
@@ -134,10 +159,13 @@ static struct mlx5_core_cq *mlx5_eq_cq_get(struct mlx5_eq *eq, u32 cqn)
return cq;
}
-static irqreturn_t mlx5_eq_comp_int(int irq, void *eq_ptr)
+static int mlx5_eq_comp_int(struct notifier_block *nb,
+ __always_unused unsigned long action,
+ __always_unused void *data)
{
- struct mlx5_eq_comp *eq_comp = eq_ptr;
- struct mlx5_eq *eq = eq_ptr;
+ struct mlx5_eq_comp *eq_comp =
+ container_of(nb, struct mlx5_eq_comp, irq_nb);
+ struct mlx5_eq *eq = &eq_comp->core;
struct mlx5_eqe *eqe;
int num_eqes = 0;
u32 cqn = -1;
@@ -175,7 +203,7 @@ static irqreturn_t mlx5_eq_comp_int(int irq, void *eq_ptr)
if (cqn != -1)
tasklet_schedule(&eq_comp->tasklet_ctx.task);
- return IRQ_HANDLED;
+ return 0;
}
/* Some architectures don't latch interrupts when they are disabled, so using
@@ -189,16 +217,19 @@ u32 mlx5_eq_poll_irq_disabled(struct mlx5_eq_comp *eq)
disable_irq(eq->core.irqn);
count_eqe = eq->core.cons_index;
- mlx5_eq_comp_int(eq->core.irqn, eq);
+ mlx5_eq_comp_int(&eq->irq_nb, 0, NULL);
count_eqe = eq->core.cons_index - count_eqe;
enable_irq(eq->core.irqn);
return count_eqe;
}
-static irqreturn_t mlx5_eq_async_int(int irq, void *eq_ptr)
+static int mlx5_eq_async_int(struct notifier_block *nb,
+ unsigned long action, void *data)
{
- struct mlx5_eq *eq = eq_ptr;
+ struct mlx5_eq_async *eq_async =
+ container_of(nb, struct mlx5_eq_async, irq_nb);
+ struct mlx5_eq *eq = &eq_async->core;
struct mlx5_eq_table *eqt;
struct mlx5_core_dev *dev;
struct mlx5_eqe *eqe;
@@ -232,7 +263,7 @@ static irqreturn_t mlx5_eq_async_int(int irq, void *eq_ptr)
out:
eq_update_ci(eq, 1);
- return IRQ_HANDLED;
+ return 0;
}
static void init_eq_buf(struct mlx5_eq *eq)
@@ -254,6 +285,7 @@ create_map_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq, const char *name,
struct mlx5_cq_table *cq_table = &eq->cq_table;
u32 out[MLX5_ST_SZ_DW(create_eq_out)] = {0};
struct mlx5_priv *priv = &dev->priv;
+ struct mlx5_irq_info *irq_info;
u8 vecidx = param->index;
__be64 *pas;
void *eqc;
@@ -261,9 +293,6 @@ create_map_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq, const char *name,
u32 *in;
int err;
- if (eq_table->irq_info[vecidx].context)
- return -EEXIST;
-
/* Init CQ table */
memset(cq_table, 0, sizeof(*cq_table));
spin_lock_init(&cq_table->lock);
@@ -306,24 +335,31 @@ create_map_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq, const char *name,
if (err)
goto err_in;
- snprintf(eq_table->irq_info[vecidx].name, MLX5_MAX_IRQ_NAME, "%s@pci:%s",
- name, pci_name(dev->pdev));
- eq_table->irq_info[vecidx].context = param->context;
+ irq_info = mlx5_irq_get(dev, vecidx);
+ ATOMIC_INIT_NOTIFIER_HEAD(&irq_info->nh);
+ snprintf(irq_info->name, MLX5_MAX_IRQ_NAME,
+ "%s@pci:%s", name, pci_name(dev->pdev));
eq->vecidx = vecidx;
eq->eqn = MLX5_GET(create_eq_out, out, eq_number);
eq->irqn = pci_irq_vector(dev->pdev, vecidx);
eq->dev = dev;
eq->doorbell = priv->uar->map + MLX5_EQ_DOORBEL_OFFSET;
- err = request_irq(eq->irqn, param->handler, 0,
- eq_table->irq_info[vecidx].name, param->context);
+ eq->irq_nb = param->nb;
+
+ err = request_irq(eq->irqn, mlx5_irq_int_handler, 0, irq_info->name,
+ &irq_info->nh);
if (err)
goto err_eq;
- err = mlx5_debug_eq_add(dev, eq);
+ err = mlx5_irq_attach_nb(irq_info, param->nb);
if (err)
goto err_irq;
+ err = mlx5_debug_eq_add(dev, eq);
+ if (err)
+ goto err_detach;
+
/* EQs are created in ARMED state
*/
eq_update_ci(eq, 1);
@@ -331,8 +367,11 @@ create_map_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq, const char *name,
kvfree(in);
return 0;
+err_detach:
+ mlx5_irq_detach_nb(irq_info, param->nb);
+
err_irq:
- free_irq(eq->irqn, eq);
+ free_irq(eq->irqn, &eq_table->irq_info[vecidx].nh);
err_eq:
mlx5_cmd_destroy_eq(dev, eq->eqn);
@@ -355,9 +394,11 @@ static int destroy_unmap_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
mlx5_debug_eq_remove(dev, eq);
- free_irq(eq->irqn, irq_info->context);
- irq_info->context = NULL;
-
+ err = mlx5_irq_detach_nb(irq_info, eq->irq_nb);
+ if (err)
+ mlx5_core_warn(eq->dev, "eq failed to detach from irq. err %d",
+ err);
+ free_irq(eq->irqn, &eq_table->irq_info[eq->vecidx].nh);
err = mlx5_cmd_destroy_eq(dev, eq->eqn);
if (err)
mlx5_core_warn(dev, "failed to destroy a previously created eq: eqn %d\n",
@@ -479,7 +520,7 @@ static int cq_err_event_notifier(struct notifier_block *nb,
/* type == MLX5_EVENT_TYPE_CQ_ERROR */
eqt = mlx5_nb_cof(nb, struct mlx5_eq_table, cq_err_nb);
- eq = &eqt->async_eq;
+ eq = &eqt->async_eq.core;
eqe = data;
cqn = be32_to_cpu(eqe->data.cq_err.cqn) & 0xffffff;
@@ -548,14 +589,14 @@ static int create_async_eqs(struct mlx5_core_dev *dev)
MLX5_NB_INIT(&table->cq_err_nb, cq_err_event_notifier, CQ_ERROR);
mlx5_eq_notifier_register(dev, &table->cq_err_nb);
+ table->cmd_eq.irq_nb.notifier_call = mlx5_eq_async_int;
param = (struct mlx5_eq_param) {
.index = MLX5_EQ_CMD_IDX,
.mask = 1ull << MLX5_EVENT_TYPE_CMD,
.nent = MLX5_NUM_CMD_EQE,
- .context = &table->cmd_eq,
- .handler = mlx5_eq_async_int,
+ .nb = &table->cmd_eq.irq_nb,
};
- err = create_async_eq(dev, "mlx5_cmd_eq", &table->cmd_eq, ¶m);
+ err = create_async_eq(dev, "mlx5_cmd_eq", &table->cmd_eq.core, ¶m);
if (err) {
mlx5_core_warn(dev, "failed to create cmd EQ %d\n", err);
goto err0;
@@ -563,27 +604,29 @@ static int create_async_eqs(struct mlx5_core_dev *dev)
mlx5_cmd_use_events(dev);
+ table->async_eq.irq_nb.notifier_call = mlx5_eq_async_int;
param = (struct mlx5_eq_param) {
.index = MLX5_EQ_ASYNC_IDX,
.mask = gather_async_events_mask(dev),
.nent = MLX5_NUM_ASYNC_EQE,
- .context = &table->async_eq,
- .handler = mlx5_eq_async_int,
+ .nb = &table->async_eq.irq_nb,
};
- err = create_async_eq(dev, "mlx5_async_eq", &table->async_eq, ¶m);
+ err = create_async_eq(dev, "mlx5_async_eq",
+ &table->async_eq.core, ¶m);
if (err) {
mlx5_core_warn(dev, "failed to create async EQ %d\n", err);
goto err1;
}
+ table->pages_eq.irq_nb.notifier_call = mlx5_eq_async_int;
param = (struct mlx5_eq_param) {
.index = MLX5_EQ_PAGEREQ_IDX,
.mask = 1 << MLX5_EVENT_TYPE_PAGE_REQUEST,
.nent = /* TODO: sriov max_vf + */ 1,
- .context = &table->pages_eq,
- .handler = mlx5_eq_async_int,
+ .nb = &table->pages_eq.irq_nb,
};
- err = create_async_eq(dev, "mlx5_pages_eq", &table->pages_eq, ¶m);
+ err = create_async_eq(dev, "mlx5_pages_eq",
+ &table->pages_eq.core, ¶m);
if (err) {
mlx5_core_warn(dev, "failed to create pages EQ %d\n", err);
goto err2;
@@ -592,11 +635,11 @@ static int create_async_eqs(struct mlx5_core_dev *dev)
return err;
err2:
- destroy_async_eq(dev, &table->async_eq);
+ destroy_async_eq(dev, &table->async_eq.core);
err1:
mlx5_cmd_use_polling(dev);
- destroy_async_eq(dev, &table->cmd_eq);
+ destroy_async_eq(dev, &table->cmd_eq.core);
err0:
mlx5_eq_notifier_unregister(dev, &table->cq_err_nb);
return err;
@@ -607,19 +650,19 @@ static void destroy_async_eqs(struct mlx5_core_dev *dev)
struct mlx5_eq_table *table = dev->priv.eq_table;
int err;
- err = destroy_async_eq(dev, &table->pages_eq);
+ err = destroy_async_eq(dev, &table->pages_eq.core);
if (err)
mlx5_core_err(dev, "failed to destroy pages eq, err(%d)\n",
err);
- err = destroy_async_eq(dev, &table->async_eq);
+ err = destroy_async_eq(dev, &table->async_eq.core);
if (err)
mlx5_core_err(dev, "failed to destroy async eq, err(%d)\n",
err);
mlx5_cmd_use_polling(dev);
- err = destroy_async_eq(dev, &table->cmd_eq);
+ err = destroy_async_eq(dev, &table->cmd_eq.core);
if (err)
mlx5_core_err(dev, "failed to destroy command eq, err(%d)\n",
err);
@@ -629,17 +672,17 @@ static void destroy_async_eqs(struct mlx5_core_dev *dev)
struct mlx5_eq *mlx5_get_async_eq(struct mlx5_core_dev *dev)
{
- return &dev->priv.eq_table->async_eq;
+ return &dev->priv.eq_table->async_eq.core;
}
void mlx5_eq_synchronize_async_irq(struct mlx5_core_dev *dev)
{
- synchronize_irq(dev->priv.eq_table->async_eq.irqn);
+ synchronize_irq(dev->priv.eq_table->async_eq.core.irqn);
}
void mlx5_eq_synchronize_cmd_irq(struct mlx5_core_dev *dev)
{
- synchronize_irq(dev->priv.eq_table->cmd_eq.irqn);
+ synchronize_irq(dev->priv.eq_table->cmd_eq.core.irqn);
}
/* Generic EQ API for mlx5_core consumers
@@ -837,12 +880,12 @@ static int create_comp_eqs(struct mlx5_core_dev *dev)
irq_cpu_rmap_add(table->rmap, pci_irq_vector(dev->pdev, vecidx));
#endif
snprintf(name, MLX5_MAX_IRQ_NAME, "mlx5_comp%d", i);
+ eq->irq_nb.notifier_call = mlx5_eq_comp_int;
param = (struct mlx5_eq_param) {
.index = vecidx,
.mask = 0,
.nent = nent,
- .context = &eq->core,
- .handler = mlx5_eq_comp_int
+ .nb = &eq->irq_nb,
};
err = create_map_eq(dev, &eq->core, name, ¶m);
if (err) {
@@ -940,10 +983,7 @@ void mlx5_core_eq_free_irqs(struct mlx5_core_dev *dev)
mutex_lock(&table->lock); /* sync with create/destroy_async_eq */
max_eqs = table->num_comp_vectors + MLX5_EQ_VEC_COMP_BASE;
for (i = max_eqs - 1; i >= 0; i--) {
- if (!table->irq_info[i].context)
- continue;
- free_irq(pci_irq_vector(dev->pdev, i), table->irq_info[i].context);
- table->irq_info[i].context = NULL;
+ free_irq(pci_irq_vector(dev->pdev, i), &table->irq_info[i].nh);
}
mutex_unlock(&table->lock);
pci_free_irq_vectors(dev->pdev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h
index c0fb6d72b695..adbc228bd55d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h
@@ -34,10 +34,17 @@ struct mlx5_eq {
u8 eqn;
int nent;
struct mlx5_rsc_debug *dbg;
+ struct notifier_block *irq_nb; /* For destroy only */
+};
+
+struct mlx5_eq_async {
+ struct mlx5_eq core;
+ struct notifier_block irq_nb;
};
struct mlx5_eq_comp {
- struct mlx5_eq core; /* Must be first */
+ struct mlx5_eq core;
+ struct notifier_block irq_nb;
struct mlx5_eq_tasklet tasklet_ctx;
struct list_head list;
};
diff --git a/include/linux/mlx5/eq.h b/include/linux/mlx5/eq.h
index 00045cc4ea11..7909f1ff197c 100644
--- a/include/linux/mlx5/eq.h
+++ b/include/linux/mlx5/eq.h
@@ -26,8 +26,7 @@ struct mlx5_eq_param {
u8 index;
int nent;
u64 mask;
- void *context;
- irq_handler_t handler;
+ struct notifier_block *nb;
};
struct mlx5_eq *
--
2.21.0
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