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From a628418f648a8b52a4da45540a9199fdcbf6e8ee Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Tue, 2 Feb 2021 18:01:04 +0100
Subject: [PATCH 153/323] chelsio: cxgb: Disable the card on error in threaded
interrupt
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.215-rt107.tar.xz
t1_fatal_err() is invoked from the interrupt handler. The bad part is
that it invokes (via t1_sge_stop()) del_timer_sync() and tasklet_kill().
Both functions must not be called from an interrupt because it is
possible that it will wait for the completion of the timer/tasklet it
just interrupted.
In case of a fatal error, use t1_interrupts_disable() to disable all
interrupt sources and then wake the interrupt thread with
F_PL_INTR_SGE_ERR as pending flag. The threaded-interrupt will stop the
card via t1_sge_stop() and not re-enable the interrupts again.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
drivers/net/ethernet/chelsio/cxgb/common.h | 1 -
drivers/net/ethernet/chelsio/cxgb/cxgb2.c | 10 ------
drivers/net/ethernet/chelsio/cxgb/sge.c | 20 +++++++++---
drivers/net/ethernet/chelsio/cxgb/sge.h | 2 +-
drivers/net/ethernet/chelsio/cxgb/subr.c | 38 +++++++++++++++-------
5 files changed, 44 insertions(+), 27 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb/common.h b/drivers/net/ethernet/chelsio/cxgb/common.h
index e999a9b9fe6cc..0321be77366c4 100644
--- a/drivers/net/ethernet/chelsio/cxgb/common.h
+++ b/drivers/net/ethernet/chelsio/cxgb/common.h
@@ -346,7 +346,6 @@ int t1_get_board_rev(adapter_t *adapter, const struct board_info *bi,
int t1_init_hw_modules(adapter_t *adapter);
int t1_init_sw_modules(adapter_t *adapter, const struct board_info *bi);
void t1_free_sw_modules(adapter_t *adapter);
-void t1_fatal_err(adapter_t *adapter);
void t1_link_changed(adapter_t *adapter, int port_id);
void t1_link_negotiated(adapter_t *adapter, int port_id, int link_stat,
int speed, int duplex, int pause);
diff --git a/drivers/net/ethernet/chelsio/cxgb/cxgb2.c b/drivers/net/ethernet/chelsio/cxgb/cxgb2.c
index 737c24136e2fe..2a28a38da036c 100644
--- a/drivers/net/ethernet/chelsio/cxgb/cxgb2.c
+++ b/drivers/net/ethernet/chelsio/cxgb/cxgb2.c
@@ -917,16 +917,6 @@ static void mac_stats_task(struct work_struct *work)
spin_unlock(&adapter->work_lock);
}
-void t1_fatal_err(struct adapter *adapter)
-{
- if (adapter->flags & FULL_INIT_DONE) {
- t1_sge_stop(adapter->sge);
- t1_interrupts_disable(adapter);
- }
- pr_alert("%s: encountered fatal error, operation suspended\n",
- adapter->name);
-}
-
static const struct net_device_ops cxgb_netdev_ops = {
.ndo_open = cxgb_open,
.ndo_stop = cxgb_close,
diff --git a/drivers/net/ethernet/chelsio/cxgb/sge.c b/drivers/net/ethernet/chelsio/cxgb/sge.c
index 5aef9ae1ecfed..cda01f22c71c8 100644
--- a/drivers/net/ethernet/chelsio/cxgb/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb/sge.c
@@ -940,10 +940,11 @@ void t1_sge_intr_clear(struct sge *sge)
/*
* SGE 'Error' interrupt handler
*/
-int t1_sge_intr_error_handler(struct sge *sge)
+bool t1_sge_intr_error_handler(struct sge *sge)
{
struct adapter *adapter = sge->adapter;
u32 cause = readl(adapter->regs + A_SG_INT_CAUSE);
+ bool wake = false;
if (adapter->port[0].dev->hw_features & NETIF_F_TSO)
cause &= ~F_PACKET_TOO_BIG;
@@ -967,11 +968,14 @@ int t1_sge_intr_error_handler(struct sge *sge)
sge->stats.pkt_mismatch++;
pr_alert("%s: SGE packet mismatch\n", adapter->name);
}
- if (cause & SGE_INT_FATAL)
- t1_fatal_err(adapter);
+ if (cause & SGE_INT_FATAL) {
+ t1_interrupts_disable(adapter);
+ adapter->pending_thread_intr |= F_PL_INTR_SGE_ERR;
+ wake = true;
+ }
writel(cause, adapter->regs + A_SG_INT_CAUSE);
- return 0;
+ return wake;
}
const struct sge_intr_counts *t1_sge_get_intr_counts(const struct sge *sge)
@@ -1635,6 +1639,14 @@ irqreturn_t t1_interrupt_thread(int irq, void *data)
if (pending_thread_intr & F_PL_INTR_EXT)
t1_elmer0_ext_intr_handler(adapter);
+ /* This error is fatal, interrupts remain off */
+ if (pending_thread_intr & F_PL_INTR_SGE_ERR) {
+ pr_alert("%s: encountered fatal error, operation suspended\n",
+ adapter->name);
+ t1_sge_stop(adapter->sge);
+ return IRQ_HANDLED;
+ }
+
spin_lock_irq(&adapter->async_lock);
adapter->slow_intr_mask |= F_PL_INTR_EXT;
diff --git a/drivers/net/ethernet/chelsio/cxgb/sge.h b/drivers/net/ethernet/chelsio/cxgb/sge.h
index 76516d2a8aa9e..716705b96f265 100644
--- a/drivers/net/ethernet/chelsio/cxgb/sge.h
+++ b/drivers/net/ethernet/chelsio/cxgb/sge.h
@@ -82,7 +82,7 @@ netdev_tx_t t1_start_xmit(struct sk_buff *skb, struct net_device *dev);
void t1_vlan_mode(struct adapter *adapter, netdev_features_t features);
void t1_sge_start(struct sge *);
void t1_sge_stop(struct sge *);
-int t1_sge_intr_error_handler(struct sge *);
+bool t1_sge_intr_error_handler(struct sge *sge);
void t1_sge_intr_enable(struct sge *);
void t1_sge_intr_disable(struct sge *);
void t1_sge_intr_clear(struct sge *);
diff --git a/drivers/net/ethernet/chelsio/cxgb/subr.c b/drivers/net/ethernet/chelsio/cxgb/subr.c
index d90ad07ff1a40..310add28fcf59 100644
--- a/drivers/net/ethernet/chelsio/cxgb/subr.c
+++ b/drivers/net/ethernet/chelsio/cxgb/subr.c
@@ -170,7 +170,7 @@ void t1_link_changed(adapter_t *adapter, int port_id)
t1_link_negotiated(adapter, port_id, link_ok, speed, duplex, fc);
}
-static int t1_pci_intr_handler(adapter_t *adapter)
+static bool t1_pci_intr_handler(adapter_t *adapter)
{
u32 pcix_cause;
@@ -179,9 +179,13 @@ static int t1_pci_intr_handler(adapter_t *adapter)
if (pcix_cause) {
pci_write_config_dword(adapter->pdev, A_PCICFG_INTR_CAUSE,
pcix_cause);
- t1_fatal_err(adapter); /* PCI errors are fatal */
+ /* PCI errors are fatal */
+ t1_interrupts_disable(adapter);
+ adapter->pending_thread_intr |= F_PL_INTR_SGE_ERR;
+ pr_alert("%s: PCI error encountered.\n", adapter->name);
+ return true;
}
- return 0;
+ return false;
}
#ifdef CONFIG_CHELSIO_T1_1G
@@ -213,10 +217,13 @@ static int fpga_phy_intr_handler(adapter_t *adapter)
static irqreturn_t fpga_slow_intr(adapter_t *adapter)
{
u32 cause = readl(adapter->regs + A_PL_CAUSE);
+ irqreturn_t ret = IRQ_NONE;
cause &= ~F_PL_INTR_SGE_DATA;
- if (cause & F_PL_INTR_SGE_ERR)
- t1_sge_intr_error_handler(adapter->sge);
+ if (cause & F_PL_INTR_SGE_ERR) {
+ if (t1_sge_intr_error_handler(adapter->sge))
+ ret = IRQ_WAKE_THREAD;
+ }
if (cause & FPGA_PCIX_INTERRUPT_GMAC)
fpga_phy_intr_handler(adapter);
@@ -231,13 +238,18 @@ static irqreturn_t fpga_slow_intr(adapter_t *adapter)
/* Clear TP interrupt */
writel(tp_cause, adapter->regs + FPGA_TP_ADDR_INTERRUPT_CAUSE);
}
- if (cause & FPGA_PCIX_INTERRUPT_PCIX)
- t1_pci_intr_handler(adapter);
+ if (cause & FPGA_PCIX_INTERRUPT_PCIX) {
+ if (t1_pci_intr_handler(adapter))
+ ret = IRQ_WAKE_THREAD;
+ }
/* Clear the interrupts just processed. */
if (cause)
writel(cause, adapter->regs + A_PL_CAUSE);
+ if (ret != IRQ_NONE)
+ return ret;
+
return cause == 0 ? IRQ_NONE : IRQ_HANDLED;
}
#endif
@@ -850,14 +862,18 @@ static irqreturn_t asic_slow_intr(adapter_t *adapter)
cause &= adapter->slow_intr_mask;
if (!cause)
return IRQ_NONE;
- if (cause & F_PL_INTR_SGE_ERR)
- t1_sge_intr_error_handler(adapter->sge);
+ if (cause & F_PL_INTR_SGE_ERR) {
+ if (t1_sge_intr_error_handler(adapter->sge))
+ ret = IRQ_WAKE_THREAD;
+ }
if (cause & F_PL_INTR_TP)
t1_tp_intr_handler(adapter->tp);
if (cause & F_PL_INTR_ESPI)
t1_espi_intr_handler(adapter->espi);
- if (cause & F_PL_INTR_PCIX)
- t1_pci_intr_handler(adapter);
+ if (cause & F_PL_INTR_PCIX) {
+ if (t1_pci_intr_handler(adapter))
+ ret = IRQ_WAKE_THREAD;
+ }
if (cause & F_PL_INTR_EXT) {
/* Wake the threaded interrupt to handle external interrupts as
* we require a process context. We disable EXT interrupts in
--
2.44.0
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