diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-03 19:43:08 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-03 19:43:08 -0700 |
commit | 597f03f9d133e9837d00965016170271d4f87dcf (patch) | |
tree | 33bdb5c1104d5b466387f4ae98748c5f4ddd29bb /drivers/net/ethernet | |
parent | 999dcbe2414e15e19cdc1f91497d01f262c6e1cf (diff) | |
parent | 0bf71e4d02ffec8ab9a6adecca61d3eed74fc99d (diff) |
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull CPU hotplug updates from Thomas Gleixner:
"Yet another batch of cpu hotplug core updates and conversions:
- Provide core infrastructure for multi instance drivers so the
drivers do not have to keep custom lists.
- Convert custom lists to the new infrastructure. The block-mq custom
list conversion comes through the block tree and makes the diffstat
tip over to more lines removed than added.
- Handle unbalanced hotplug enable/disable calls more gracefully.
- Remove the obsolete CPU_STARTING/DYING notifier support.
- Convert another batch of notifier users.
The relayfs changes which conflicted with the conversion have been
shipped to me by Andrew.
The remaining lot is targeted for 4.10 so that we finally can remove
the rest of the notifiers"
* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (46 commits)
cpufreq: Fix up conversion to hotplug state machine
blk/mq: Reserve hotplug states for block multiqueue
x86/apic/uv: Convert to hotplug state machine
s390/mm/pfault: Convert to hotplug state machine
mips/loongson/smp: Convert to hotplug state machine
mips/octeon/smp: Convert to hotplug state machine
fault-injection/cpu: Convert to hotplug state machine
padata: Convert to hotplug state machine
cpufreq: Convert to hotplug state machine
ACPI/processor: Convert to hotplug state machine
virtio scsi: Convert to hotplug state machine
oprofile/timer: Convert to hotplug state machine
block/softirq: Convert to hotplug state machine
lib/irq_poll: Convert to hotplug state machine
x86/microcode: Convert to hotplug state machine
sh/SH-X3 SMP: Convert to hotplug state machine
ia64/mca: Convert to hotplug state machine
ARM/OMAP/wakeupgen: Convert to hotplug state machine
ARM/shmobile: Convert to hotplug state machine
arm64/FP/SIMD: Convert to hotplug state machine
...
Diffstat (limited to 'drivers/net/ethernet')
-rw-r--r-- | drivers/net/ethernet/marvell/mvneta.c | 232 |
1 files changed, 143 insertions, 89 deletions
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index d41c28d00b57..b74548728fb5 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -382,7 +382,8 @@ struct mvneta_port { struct mvneta_rx_queue *rxqs; struct mvneta_tx_queue *txqs; struct net_device *dev; - struct notifier_block cpu_notifier; + struct hlist_node node_online; + struct hlist_node node_dead; int rxq_def; /* Protect the access to the percpu interrupt registers, * ensuring that the configuration remains coherent. @@ -574,6 +575,7 @@ struct mvneta_rx_queue { int next_desc_to_proc; }; +static enum cpuhp_state online_hpstate; /* The hardware supports eight (8) rx queues, but we are only allowing * the first one to be used. Therefore, let's just allocate one queue. */ @@ -3311,101 +3313,104 @@ static void mvneta_percpu_elect(struct mvneta_port *pp) } }; -static int mvneta_percpu_notifier(struct notifier_block *nfb, - unsigned long action, void *hcpu) +static int mvneta_cpu_online(unsigned int cpu, struct hlist_node *node) { - struct mvneta_port *pp = container_of(nfb, struct mvneta_port, - cpu_notifier); - int cpu = (unsigned long)hcpu, other_cpu; + int other_cpu; + struct mvneta_port *pp = hlist_entry_safe(node, struct mvneta_port, + node_online); struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu); - switch (action) { - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - case CPU_DOWN_FAILED: - case CPU_DOWN_FAILED_FROZEN: - spin_lock(&pp->lock); - /* Configuring the driver for a new CPU while the - * driver is stopping is racy, so just avoid it. - */ - if (pp->is_stopped) { - spin_unlock(&pp->lock); - break; - } - netif_tx_stop_all_queues(pp->dev); - /* We have to synchronise on tha napi of each CPU - * except the one just being waked up - */ - for_each_online_cpu(other_cpu) { - if (other_cpu != cpu) { - struct mvneta_pcpu_port *other_port = - per_cpu_ptr(pp->ports, other_cpu); + spin_lock(&pp->lock); + /* + * Configuring the driver for a new CPU while the driver is + * stopping is racy, so just avoid it. + */ + if (pp->is_stopped) { + spin_unlock(&pp->lock); + return 0; + } + netif_tx_stop_all_queues(pp->dev); - napi_synchronize(&other_port->napi); - } + /* + * We have to synchronise on tha napi of each CPU except the one + * just being woken up + */ + for_each_online_cpu(other_cpu) { + if (other_cpu != cpu) { + struct mvneta_pcpu_port *other_port = + per_cpu_ptr(pp->ports, other_cpu); + + napi_synchronize(&other_port->napi); } + } - /* Mask all ethernet port interrupts */ - on_each_cpu(mvneta_percpu_mask_interrupt, pp, true); - napi_enable(&port->napi); + /* Mask all ethernet port interrupts */ + on_each_cpu(mvneta_percpu_mask_interrupt, pp, true); + napi_enable(&port->napi); + /* + * Enable per-CPU interrupts on the CPU that is + * brought up. + */ + mvneta_percpu_enable(pp); - /* Enable per-CPU interrupts on the CPU that is - * brought up. - */ - mvneta_percpu_enable(pp); + /* + * Enable per-CPU interrupt on the one CPU we care + * about. + */ + mvneta_percpu_elect(pp); - /* Enable per-CPU interrupt on the one CPU we care - * about. - */ - mvneta_percpu_elect(pp); - - /* Unmask all ethernet port interrupts */ - on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true); - mvreg_write(pp, MVNETA_INTR_MISC_MASK, - MVNETA_CAUSE_PHY_STATUS_CHANGE | - MVNETA_CAUSE_LINK_CHANGE | - MVNETA_CAUSE_PSC_SYNC_CHANGE); - netif_tx_start_all_queues(pp->dev); - spin_unlock(&pp->lock); - break; - case CPU_DOWN_PREPARE: - case CPU_DOWN_PREPARE_FROZEN: - netif_tx_stop_all_queues(pp->dev); - /* Thanks to this lock we are sure that any pending - * cpu election is done - */ - spin_lock(&pp->lock); - /* Mask all ethernet port interrupts */ - on_each_cpu(mvneta_percpu_mask_interrupt, pp, true); - spin_unlock(&pp->lock); + /* Unmask all ethernet port interrupts */ + on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true); + mvreg_write(pp, MVNETA_INTR_MISC_MASK, + MVNETA_CAUSE_PHY_STATUS_CHANGE | + MVNETA_CAUSE_LINK_CHANGE | + MVNETA_CAUSE_PSC_SYNC_CHANGE); + netif_tx_start_all_queues(pp->dev); + spin_unlock(&pp->lock); + return 0; +} - napi_synchronize(&port->napi); - napi_disable(&port->napi); - /* Disable per-CPU interrupts on the CPU that is - * brought down. - */ - mvneta_percpu_disable(pp); +static int mvneta_cpu_down_prepare(unsigned int cpu, struct hlist_node *node) +{ + struct mvneta_port *pp = hlist_entry_safe(node, struct mvneta_port, + node_online); + struct mvneta_pcpu_port *port = per_cpu_ptr(pp->ports, cpu); - break; - case CPU_DEAD: - case CPU_DEAD_FROZEN: - /* Check if a new CPU must be elected now this on is down */ - spin_lock(&pp->lock); - mvneta_percpu_elect(pp); - spin_unlock(&pp->lock); - /* Unmask all ethernet port interrupts */ - on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true); - mvreg_write(pp, MVNETA_INTR_MISC_MASK, - MVNETA_CAUSE_PHY_STATUS_CHANGE | - MVNETA_CAUSE_LINK_CHANGE | - MVNETA_CAUSE_PSC_SYNC_CHANGE); - netif_tx_start_all_queues(pp->dev); - break; - } + /* + * Thanks to this lock we are sure that any pending cpu election is + * done. + */ + spin_lock(&pp->lock); + /* Mask all ethernet port interrupts */ + on_each_cpu(mvneta_percpu_mask_interrupt, pp, true); + spin_unlock(&pp->lock); - return NOTIFY_OK; + napi_synchronize(&port->napi); + napi_disable(&port->napi); + /* Disable per-CPU interrupts on the CPU that is brought down. */ + mvneta_percpu_disable(pp); + return 0; +} + +static int mvneta_cpu_dead(unsigned int cpu, struct hlist_node *node) +{ + struct mvneta_port *pp = hlist_entry_safe(node, struct mvneta_port, + node_dead); + + /* Check if a new CPU must be elected now this on is down */ + spin_lock(&pp->lock); + mvneta_percpu_elect(pp); + spin_unlock(&pp->lock); + /* Unmask all ethernet port interrupts */ + on_each_cpu(mvneta_percpu_unmask_interrupt, pp, true); + mvreg_write(pp, MVNETA_INTR_MISC_MASK, + MVNETA_CAUSE_PHY_STATUS_CHANGE | + MVNETA_CAUSE_LINK_CHANGE | + MVNETA_CAUSE_PSC_SYNC_CHANGE); + netif_tx_start_all_queues(pp->dev); + return 0; } static int mvneta_open(struct net_device *dev) @@ -3442,7 +3447,15 @@ static int mvneta_open(struct net_device *dev) /* Register a CPU notifier to handle the case where our CPU * might be taken offline. */ - register_cpu_notifier(&pp->cpu_notifier); + ret = cpuhp_state_add_instance_nocalls(online_hpstate, + &pp->node_online); + if (ret) + goto err_free_irq; + + ret = cpuhp_state_add_instance_nocalls(CPUHP_NET_MVNETA_DEAD, + &pp->node_dead); + if (ret) + goto err_free_online_hp; /* In default link is down */ netif_carrier_off(pp->dev); @@ -3450,15 +3463,19 @@ static int mvneta_open(struct net_device *dev) ret = mvneta_mdio_probe(pp); if (ret < 0) { netdev_err(dev, "cannot probe MDIO bus\n"); - goto err_free_irq; + goto err_free_dead_hp; } mvneta_start_dev(pp); return 0; +err_free_dead_hp: + cpuhp_state_remove_instance_nocalls(CPUHP_NET_MVNETA_DEAD, + &pp->node_dead); +err_free_online_hp: + cpuhp_state_remove_instance_nocalls(online_hpstate, &pp->node_online); err_free_irq: - unregister_cpu_notifier(&pp->cpu_notifier); on_each_cpu(mvneta_percpu_disable, pp, true); free_percpu_irq(pp->dev->irq, pp->ports); err_cleanup_txqs: @@ -3484,7 +3501,10 @@ static int mvneta_stop(struct net_device *dev) mvneta_stop_dev(pp); mvneta_mdio_remove(pp); - unregister_cpu_notifier(&pp->cpu_notifier); + + cpuhp_state_remove_instance_nocalls(online_hpstate, &pp->node_online); + cpuhp_state_remove_instance_nocalls(CPUHP_NET_MVNETA_DEAD, + &pp->node_dead); on_each_cpu(mvneta_percpu_disable, pp, true); free_percpu_irq(dev->irq, pp->ports); mvneta_cleanup_rxqs(pp); @@ -4024,7 +4044,6 @@ static int mvneta_probe(struct platform_device *pdev) err = of_property_read_string(dn, "managed", &managed); pp->use_inband_status = (err == 0 && strcmp(managed, "in-band-status") == 0); - pp->cpu_notifier.notifier_call = mvneta_percpu_notifier; pp->rxq_def = rxq_def; @@ -4227,7 +4246,42 @@ static struct platform_driver mvneta_driver = { }, }; -module_platform_driver(mvneta_driver); +static int __init mvneta_driver_init(void) +{ + int ret; + + ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "net/mvmeta:online", + mvneta_cpu_online, + mvneta_cpu_down_prepare); + if (ret < 0) + goto out; + online_hpstate = ret; + ret = cpuhp_setup_state_multi(CPUHP_NET_MVNETA_DEAD, "net/mvneta:dead", + NULL, mvneta_cpu_dead); + if (ret) + goto err_dead; + + ret = platform_driver_register(&mvneta_driver); + if (ret) + goto err; + return 0; + +err: + cpuhp_remove_multi_state(CPUHP_NET_MVNETA_DEAD); +err_dead: + cpuhp_remove_multi_state(online_hpstate); +out: + return ret; +} +module_init(mvneta_driver_init); + +static void __exit mvneta_driver_exit(void) +{ + platform_driver_unregister(&mvneta_driver); + cpuhp_remove_multi_state(CPUHP_NET_MVNETA_DEAD); + cpuhp_remove_multi_state(online_hpstate); +} +module_exit(mvneta_driver_exit); MODULE_DESCRIPTION("Marvell NETA Ethernet Driver - www.marvell.com"); MODULE_AUTHOR("Rami Rosen <rosenr@marvell.com>, Thomas Petazzoni <thomas.petazzoni@free-electrons.com>"); |