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Date: Tue, 19 Dec 2006 09:13:32 +0900
From: Kenzo Iwami <k-iwami@...jp.nec.com>
To: Kenzo Iwami <k-iwami@...jp.nec.com>
CC: Auke Kok <auke-jan.h.kok@...el.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Shaw Vrana <shaw@...nix.com>, netdev@...r.kernel.org,
"Ronciak, John" <john.ronciak@...el.com>
Subject: Re: watchdog timeout panic in e1000 driver
Hi,
Previously, I posted a patch that fixed this problem without using spinlocks
nor disabling interrupts.
I have rebased this patch for 2.6.20-rc1.
Does this patch have problems?
I welcome any comments.
--
Kenzo Iwami (k-iwami@...jp.nec.com)
Signed-off-by: Kenzo Iwami <k-iwami@...jp.nec.com>
diff -urpN linux-2.6.20-rc1-org/drivers/net/e1000/e1000_hw.c
linux-2.6.20-rc1-fix/drivers/net/e1000/e1000_hw.c
--- linux-2.6.20-rc1-org/drivers/net/e1000/e1000_hw.c 2006-12-14
10:14:23.000000000 +0900
+++ linux-2.6.20-rc1-fix/drivers/net/e1000/e1000_hw.c 2006-12-18
13:10:21.000000000 +0900
@@ -3394,8 +3394,19 @@ e1000_swfw_sync_acquire(struct e1000_hw
return e1000_get_hw_eeprom_semaphore(hw);
while (timeout) {
- if (e1000_get_hw_eeprom_semaphore(hw))
+ atomic_inc(&hw->swfw_sem_count);
+ if (e1000_get_hw_eeprom_semaphore(hw)) {
+ if (atomic_xchg(&hw->watchdog_deferred, 0)) {
+retry1:
+ e1000_do_watchdog(hw);
+ }
+ atomic_dec(&hw->swfw_sem_count);
+ if (atomic_read(&hw->watchdog_deferred)) {
+ atomic_inc(&hw->swfw_sem_count);
+ goto retry1;
+ }
return -E1000_ERR_SWFW_SYNC;
+ }
swfw_sync = E1000_READ_REG(hw, SW_FW_SYNC);
if (!(swfw_sync & (fwmask | swmask))) {
@@ -3405,6 +3416,15 @@ e1000_swfw_sync_acquire(struct e1000_hw
/* firmware currently using resource (fwmask) */
/* or other software thread currently using resource (swmask) */
e1000_put_hw_eeprom_semaphore(hw);
+ if (atomic_xchg(&hw->watchdog_deferred, 0)) {
+retry2:
+ e1000_do_watchdog(hw);
+ }
+ atomic_dec(&hw->swfw_sem_count);
+ if (atomic_read(&hw->watchdog_deferred)) {
+ atomic_inc(&hw->swfw_sem_count);
+ goto retry2;
+ }
mdelay(5);
timeout--;
}
@@ -3418,6 +3438,15 @@ e1000_swfw_sync_acquire(struct e1000_hw
E1000_WRITE_REG(hw, SW_FW_SYNC, swfw_sync);
e1000_put_hw_eeprom_semaphore(hw);
+ if (atomic_xchg(&hw->watchdog_deferred, 0)) {
+retry3:
+ e1000_do_watchdog(hw);
+ }
+ atomic_dec(&hw->swfw_sem_count);
+ if (atomic_read(&hw->watchdog_deferred)) {
+ atomic_inc(&hw->swfw_sem_count);
+ goto retry3;
+ }
return E1000_SUCCESS;
}
@@ -3439,6 +3468,7 @@ e1000_swfw_sync_release(struct e1000_hw
return;
}
+ atomic_inc(&hw->swfw_sem_count);
/* if (e1000_get_hw_eeprom_semaphore(hw))
* return -E1000_ERR_SWFW_SYNC; */
while (e1000_get_hw_eeprom_semaphore(hw) != E1000_SUCCESS);
@@ -3449,6 +3479,15 @@ e1000_swfw_sync_release(struct e1000_hw
E1000_WRITE_REG(hw, SW_FW_SYNC, swfw_sync);
e1000_put_hw_eeprom_semaphore(hw);
+ if (atomic_xchg(&hw->watchdog_deferred, 0)) {
+retry:
+ e1000_do_watchdog(hw);
+ }
+ atomic_dec(&hw->swfw_sem_count);
+ if (atomic_read(&hw->watchdog_deferred)) {
+ atomic_inc(&hw->swfw_sem_count);
+ goto retry;
+ }
}
/*****************************************************************************
diff -urpN linux-2.6.20-rc1-org/drivers/net/e1000/e1000_hw.h
linux-2.6.20-rc1-fix/drivers/net/e1000/e1000_hw.h
--- linux-2.6.20-rc1-org/drivers/net/e1000/e1000_hw.h 2006-12-14
10:14:23.000000000 +0900
+++ linux-2.6.20-rc1-fix/drivers/net/e1000/e1000_hw.h 2006-12-18
13:09:15.000000000 +0900
@@ -306,6 +306,7 @@ typedef enum {
#define E1000_BYTE_SWAP_WORD(_value) ((((_value) & 0x00ff) << 8) | \
(((_value) & 0xff00) >> 8))
+extern void e1000_do_watchdog(struct e1000_hw *hw);
/* Function prototypes */
/* Initialization */
int32_t e1000_reset_hw(struct e1000_hw *hw);
@@ -1460,6 +1461,8 @@ struct e1000_hw {
boolean_t mng_reg_access_disabled;
boolean_t leave_av_bit_off;
boolean_t kmrn_lock_loss_workaround_disabled;
+ atomic_t swfw_sem_count;
+ atomic_t watchdog_deferred;
};
diff -urpN linux-2.6.20-rc1-org/drivers/net/e1000/e1000_main.c
linux-2.6.20-rc1-fix/drivers/net/e1000/e1000_main.c
--- linux-2.6.20-rc1-org/drivers/net/e1000/e1000_main.c 2006-12-14
10:14:23.000000000 +0900
+++ linux-2.6.20-rc1-fix/drivers/net/e1000/e1000_main.c 2006-12-18
10:03:05.000000000 +0900
@@ -152,6 +152,7 @@ static void e1000_clean_rx_ring(struct e
static void e1000_set_multi(struct net_device *netdev);
static void e1000_update_phy_info(unsigned long data);
static void e1000_watchdog(unsigned long data);
+void e1000_do_watchdog(struct e1000_hw *hw);
static void e1000_82547_tx_fifo_stall(unsigned long data);
static int e1000_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static struct net_device_stats * e1000_get_stats(struct net_device *netdev);
@@ -1184,6 +1185,9 @@ e1000_sw_init(struct e1000_adapter *adap
hw->tbi_compatibility_en = TRUE;
hw->adaptive_ifs = TRUE;
+ atomic_set(&hw->swfw_sem_count, 0);
+ atomic_set(&hw->watchdog_deferred, 0);
+
/* Copper options */
if (hw->media_type == e1000_media_type_copper) {
@@ -2426,6 +2430,25 @@ static void
e1000_watchdog(unsigned long data)
{
struct e1000_adapter *adapter = (struct e1000_adapter *) data;
+ struct e1000_hw *hw = &adapter->hw;
+
+ if (hw->swfw_sync_present) {
+ if (atomic_read(&hw->swfw_sem_count))
+ atomic_set(&hw->watchdog_deferred, 1);
+ else
+ e1000_do_watchdog(hw);
+ } else {
+ e1000_do_watchdog(hw);
+ }
+
+ /* Reset the timer */
+ mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
+}
+
+void
+e1000_do_watchdog(struct e1000_hw *hw)
+{
+ struct e1000_adapter *adapter = hw->back;
struct net_device *netdev = adapter->netdev;
struct e1000_tx_ring *txdr = adapter->tx_ring;
uint32_t link, tctl;
@@ -2586,9 +2609,6 @@ e1000_watchdog(unsigned long data)
* reset from the other port. Set the appropriate LAA in RAR[0] */
if (adapter->hw.mac_type == e1000_82571 && adapter->hw.laa_is_present)
e1000_rar_set(&adapter->hw, adapter->hw.mac_addr, 0);
-
- /* Reset the timer */
- mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
}
enum latency_range {
-
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