From: Sam Bobroff <sam.bobroff@au1.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Subject: [PATCH 1/9] powerpc/eeh: Remove eeh_handle_event()
Date: Tue, 6 Mar 2018 10:58:43 +1100 [thread overview]
Message-ID: <d3d01073da02a5eb844cc8998fdac602b8121b62.1520294174.git.sam.bobroff@au1.ibm.com> (raw)
In-Reply-To: <cover.1520294174.git.sam.bobroff@au1.ibm.com>
The function eeh_handle_event(pe) does nothing other than switching
between calling eeh_handle_normal_event(pe) and
eeh_handle_special_event(). However it is only called in two places,
one where pe can't be NULL and the other where it must be NULL (see
eeh_event_handler()) so it does nothing but obscure the flow of
control.
So, remove it.
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
---
arch/powerpc/include/asm/eeh_event.h | 3 ++-
arch/powerpc/kernel/eeh_driver.c | 42 +++++++++++++-----------------------
arch/powerpc/kernel/eeh_event.c | 4 ++--
3 files changed, 19 insertions(+), 30 deletions(-)
diff --git a/arch/powerpc/include/asm/eeh_event.h b/arch/powerpc/include/asm/eeh_event.h
index 1e551a2d6f82..0a168038882d 100644
--- a/arch/powerpc/include/asm/eeh_event.h
+++ b/arch/powerpc/include/asm/eeh_event.h
@@ -34,7 +34,8 @@ struct eeh_event {
int eeh_event_init(void);
int eeh_send_failure_event(struct eeh_pe *pe);
void eeh_remove_event(struct eeh_pe *pe, bool force);
-void eeh_handle_event(struct eeh_pe *pe);
+bool eeh_handle_normal_event(struct eeh_pe *pe);
+void eeh_handle_special_event(void);
#endif /* __KERNEL__ */
#endif /* ASM_POWERPC_EEH_EVENT_H */
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index 0c0b66fc5bfb..51b21c97910f 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -738,9 +738,22 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
* Attempts to recover the given PE. If recovery fails or the PE has failed
* too many times, remove the PE.
*
+ * While PHB detects address or data parity errors on particular PCI
+ * slot, the associated PE will be frozen. Besides, DMA's occurring
+ * to wild addresses (which usually happen due to bugs in device
+ * drivers or in PCI adapter firmware) can cause EEH error. #SERR,
+ * #PERR or other misc PCI-related errors also can trigger EEH errors.
+ *
+ * Recovery process consists of unplugging the device driver (which
+ * generated hotplug events to userspace), then issuing a PCI #RST to
+ * the device, then reconfiguring the PCI config space for all bridges
+ * & devices under this slot, and then finally restarting the device
+ * drivers (which cause a second set of hotplug events to go out to
+ * userspace).
+ *
* Returns true if @pe should no longer be used, else false.
*/
-static bool eeh_handle_normal_event(struct eeh_pe *pe)
+bool eeh_handle_normal_event(struct eeh_pe *pe)
{
struct pci_bus *frozen_bus;
struct eeh_dev *edev, *tmp;
@@ -942,7 +955,7 @@ static bool eeh_handle_normal_event(struct eeh_pe *pe)
* specific PE. Iterates through possible failures and handles them as
* necessary.
*/
-static void eeh_handle_special_event(void)
+void eeh_handle_special_event(void)
{
struct eeh_pe *pe, *phb_pe;
struct pci_bus *bus;
@@ -1049,28 +1062,3 @@ static void eeh_handle_special_event(void)
break;
} while (rc != EEH_NEXT_ERR_NONE);
}
-
-/**
- * eeh_handle_event - Reset a PCI device after hard lockup.
- * @pe: EEH PE
- *
- * While PHB detects address or data parity errors on particular PCI
- * slot, the associated PE will be frozen. Besides, DMA's occurring
- * to wild addresses (which usually happen due to bugs in device
- * drivers or in PCI adapter firmware) can cause EEH error. #SERR,
- * #PERR or other misc PCI-related errors also can trigger EEH errors.
- *
- * Recovery process consists of unplugging the device driver (which
- * generated hotplug events to userspace), then issuing a PCI #RST to
- * the device, then reconfiguring the PCI config space for all bridges
- * & devices under this slot, and then finally restarting the device
- * drivers (which cause a second set of hotplug events to go out to
- * userspace).
- */
-void eeh_handle_event(struct eeh_pe *pe)
-{
- if (pe)
- eeh_handle_normal_event(pe);
- else
- eeh_handle_special_event();
-}
diff --git a/arch/powerpc/kernel/eeh_event.c b/arch/powerpc/kernel/eeh_event.c
index accbf8b5fd46..872bcfe8f90e 100644
--- a/arch/powerpc/kernel/eeh_event.c
+++ b/arch/powerpc/kernel/eeh_event.c
@@ -81,10 +81,10 @@ static int eeh_event_handler(void * dummy)
pr_info("EEH: Detected PCI bus error on "
"PHB#%x-PE#%x\n",
pe->phb->global_number, pe->addr);
- eeh_handle_event(pe);
+ eeh_handle_normal_event(pe);
eeh_pe_state_clear(pe, EEH_PE_RECOVERING);
} else {
- eeh_handle_event(NULL);
+ eeh_handle_special_event();
}
kfree(event);
--
2.16.1.74.g9b0b1f47b
next prev parent reply other threads:[~2018-03-05 23:58 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-05 23:58 [PATCH 0/9] EEH refactoring 1 Sam Bobroff
2018-03-05 23:58 ` Sam Bobroff [this message]
2018-03-06 0:44 ` [PATCH 1/9] powerpc/eeh: Remove eeh_handle_event() Russell Currey
2018-03-06 1:08 ` Daniel Axtens
2018-03-05 23:58 ` [PATCH 2/9] powerpc/eeh: Manage EEH_PE_RECOVERING inside eeh_handle_normal_event() Sam Bobroff
2018-03-06 0:48 ` Russell Currey
2018-03-06 1:47 ` Daniel Axtens
2018-03-05 23:59 ` [PATCH 3/9] powerpc/eeh: Fix misleading comment in __eeh_addr_cache_get_device() Sam Bobroff
2018-03-06 0:49 ` Russell Currey
2018-03-05 23:59 ` [PATCH 4/9] powerpc/eeh: Remove misleading test in eeh_handle_normal_event() Sam Bobroff
2018-03-06 0:56 ` Russell Currey
2018-03-06 2:14 ` Daniel Axtens
2018-03-05 23:59 ` [PATCH 5/9] powerpc/eeh: Rename frozen_bus to bus " Sam Bobroff
2018-03-06 0:57 ` Russell Currey
2018-03-05 23:59 ` [PATCH 6/9] powerpc/eeh: Clarify arguments to eeh_reset_device() Sam Bobroff
2018-03-06 4:37 ` Russell Currey
2018-03-05 23:59 ` [PATCH 7/9] powerpc/eeh: Remove always-true tests in eeh_reset_device() Sam Bobroff
2018-03-06 4:38 ` Russell Currey
2018-03-05 23:59 ` [PATCH 8/9] powerpc/eeh: Factor out common code eeh_reset_device() Sam Bobroff
2018-03-06 5:48 ` Russell Currey
2018-03-06 0:00 ` [PATCH 9/9] powerpc/eeh: Add eeh_state_active() helper Sam Bobroff
2018-03-06 5:49 ` Russell Currey
2018-03-07 3:33 ` Sam Bobroff
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