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From: Jeff Guo <jia.guo@intel.com>
To: konstantin.ananyev@intel.com, anatoly.burakov@intel.com,
	thomas@monjalon.net, bernard.iremonger@intel.com,
	jingjing.wu@intel.com, wenzhuo.lu@intel.com
Cc: ferruh.yigit@intel.com, dev@dpdk.org, jia.guo@intel.com,
	helin.zhang@intel.com, matan@mellanox.com, shaopeng.he@intel.com
Subject: [dpdk-dev] [PATCH 2/3] vfio: fix to add handler lock for hot-unplug
Date: Tue,  6 Nov 2018 14:07:14 +0800
Message-ID: <1541484436-91320-3-git-send-email-jia.guo@intel.com> (raw)
In-Reply-To: <1541484436-91320-1-git-send-email-jia.guo@intel.com>

This patch add hot-unplug handler lock and unlock in device request
handler when process bus and device resource, in order to avoid the
synchronization issue when device be hot-unplugged.

Fixes: c115fd000c32 ("vfio: handle hotplug request notifier")
Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
 drivers/bus/pci/linux/pci_vfio.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/pci/linux/pci_vfio.c b/drivers/bus/pci/linux/pci_vfio.c
index 305cc06..d2c8410 100644
--- a/drivers/bus/pci/linux/pci_vfio.c
+++ b/drivers/bus/pci/linux/pci_vfio.c
@@ -19,6 +19,7 @@
 #include <rte_vfio.h>
 #include <rte_eal.h>
 #include <rte_bus.h>
+#include <rte_spinlock.h>
 
 #include "eal_filesystem.h"
 
@@ -35,6 +36,14 @@
  * This file is only compiled if CONFIG_RTE_EAL_VFIO is set to "y".
  */
 
+/*
+ * spinlock for device hot-unplug failure handling. If it try to access bus or
+ * device, such as handle sigbus on bus or handle memory failure for device
+ * just need to use this lock. It could protect the bus and the device to avoid
+ * race condition.
+ */
+static rte_spinlock_t failure_handle_lock = RTE_SPINLOCK_INITIALIZER;
+
 #ifdef VFIO_PRESENT
 
 #ifndef PAGE_SIZE
@@ -289,11 +298,12 @@ pci_vfio_req_handler(void *param)
 	int ret;
 	struct rte_device *device = (struct rte_device *)param;
 
+	rte_spinlock_lock(&failure_handle_lock);
 	bus = rte_bus_find_by_device(device);
 	if (bus == NULL) {
 		RTE_LOG(ERR, EAL, "Cannot find bus for device (%s)\n",
 			device->name);
-		return;
+		goto handle_end;
 	}
 
 	/*
@@ -306,6 +316,8 @@ pci_vfio_req_handler(void *param)
 		RTE_LOG(ERR, EAL,
 			"Can not handle hot-unplug for device (%s)\n",
 			device->name);
+handle_end:
+	rte_spinlock_unlock(&failure_handle_lock);
 }
 
 /* enable notifier (only enable req now) */
-- 
2.7.4

  parent reply	other threads:[~2018-11-06  6:03 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-06  6:07 [dpdk-dev] [PATCH 0/3] fix vfio hot-unplug issue Jeff Guo
2018-11-06  6:07 ` [dpdk-dev] [PATCH 1/3] eal: fix lock issue for hot-unplug Jeff Guo
2018-11-06  6:22   ` Matan Azrad
2018-11-07  5:49     ` Jeff Guo
2018-11-08  7:08       ` Matan Azrad
2018-11-06  6:07 ` Jeff Guo [this message]
2018-11-06  6:23   ` [dpdk-dev] [PATCH 2/3] vfio: fix to add handler lock " Matan Azrad
2018-11-07  6:15     ` Jeff Guo
2018-11-08  7:20       ` Matan Azrad
2018-11-08  8:30         ` Jeff Guo
2018-11-06  6:07 ` [dpdk-dev] [PATCH 3/3] app/testpmd: fix callback issue " Jeff Guo
2018-11-06  6:36   ` Matan Azrad
2018-11-07  7:30     ` Jeff Guo
2018-11-07 11:05       ` Ananyev, Konstantin
2018-11-08  7:28         ` Matan Azrad
2018-11-08  8:49           ` Jeff Guo
2018-11-08  9:35             ` Matan Azrad
2018-11-09  3:55               ` Jeff Guo
2018-11-09  5:24                 ` Matan Azrad
2018-11-09  6:17                   ` Jeff Guo
     [not found]                     ` <AM0PR0502MB401938411A7E2BA9E76576A2D2C00@AM0PR0502MB4019.eurprd05.prod.outlook.com>
2018-11-12  1:35                       ` Thomas Monjalon
2018-11-14  9:32                         ` Jeff Guo
2018-11-15  9:18 ` [dpdk-dev] [PATCH V2 0/3] fix vfio hot-unplug issue Jeff Guo
2018-11-15  9:18   ` Jeff Guo
2018-11-18 16:19     ` Thomas Monjalon
2018-11-15  9:18   ` [dpdk-dev] [PATCH V2 1/3] eal: fix lock issue for hot-unplug Jeff Guo
2018-11-15  9:18   ` [dpdk-dev] [PATCH V2 2/3] vfio: fix to add handler lock " Jeff Guo
2018-11-15  9:18   ` [dpdk-dev] [PATCH V2 3/3] app/testpmd: fix callback issue " Jeff Guo

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