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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull irq fixes from Ingo Molnar:
 "Misc irq fixes:

   - two driver fixes
   - a Xen regression fix
   - a nested irq thread crash fix"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/gicv3-its: Fix mapping of LPIs to collections
  genirq: Prevent resend to interrupts marked IRQ_NESTED_THREAD
  genirq: Revert sparse irq locking around __cpu_up() and move it to x86 for now
  gpio/davinci: Fix race in installing chained irq handler
This commit is contained in:
Linus Torvalds 2015-07-18 10:27:12 -07:00
commit 59ee762156
5 changed files with 101 additions and 54 deletions
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11
arch/x86/kernel/smpboot.c
View File

@ -992,8 +992,17 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
common_cpu_up(cpu, tidle);
/*
* We have to walk the irq descriptors to setup the vector
* space for the cpu which comes online. Prevent irq
* alloc/free across the bringup.
*/
irq_lock_sparse();
err = do_boot_cpu(apicid, cpu, tidle);
if (err) {
irq_unlock_sparse();
pr_err("do_boot_cpu failed(%d) to wakeup CPU#%u\n", err, cpu);
return -EIO;
}
@ -1011,6 +1020,8 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
touch_nmi_watchdog();
}
irq_unlock_sparse();
return 0;
}

6
drivers/gpio/gpio-davinci.c
View File

@ -578,15 +578,13 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
writel_relaxed(~0, &g->clr_falling);
writel_relaxed(~0, &g->clr_rising);
/* set up all irqs in this bank */
irq_set_chained_handler(bank_irq, gpio_irq_handler);
/*
* Each chip handles 32 gpios, and each irq bank consists of 16
* gpio irqs. Pass the irq bank's corresponding controller to
* the chained irq handler.
*/
irq_set_handler_data(bank_irq, &chips[gpio / 32]);
irq_set_chained_handler_and_data(bank_irq, gpio_irq_handler,
&chips[gpio / 32]);
binten |= BIT(bank);
}

111
drivers/irqchip/irq-gic-v3-its.c
View File

@ -75,6 +75,13 @@ struct its_node {
#define ITS_ITT_ALIGN SZ_256
struct event_lpi_map {
unsigned long *lpi_map;
u16 *col_map;
irq_hw_number_t lpi_base;
int nr_lpis;
};
/*
* The ITS view of a device - belongs to an ITS, a collection, owns an
* interrupt translation table, and a list of interrupts.
@ -82,11 +89,8 @@ struct its_node {
struct its_device {
struct list_head entry;
struct its_node *its;
struct its_collection *collection;
struct event_lpi_map event_map;
void *itt;
unsigned long *lpi_map;
irq_hw_number_t lpi_base;
int nr_lpis;
u32 nr_ites;
u32 device_id;
};
@ -99,6 +103,14 @@ static struct rdists *gic_rdists;
#define gic_data_rdist() (raw_cpu_ptr(gic_rdists->rdist))
#define gic_data_rdist_rd_base() (gic_data_rdist()->rd_base)
static struct its_collection *dev_event_to_col(struct its_device *its_dev,
u32 event)
{
struct its_node *its = its_dev->its;
return its->collections + its_dev->event_map.col_map[event];
}
/*
* ITS command descriptors - parameters to be encoded in a command
* block.
@ -134,7 +146,7 @@ struct its_cmd_desc {
struct {
struct its_device *dev;
struct its_collection *col;
u32 id;
u32 event_id;
} its_movi_cmd;
struct {
@ -241,7 +253,7 @@ static struct its_collection *its_build_mapd_cmd(struct its_cmd_block *cmd,
its_fixup_cmd(cmd);
return desc->its_mapd_cmd.dev->collection;
return NULL;
}
static struct its_collection *its_build_mapc_cmd(struct its_cmd_block *cmd,
@ -260,52 +272,72 @@ static struct its_collection *its_build_mapc_cmd(struct its_cmd_block *cmd,
static struct its_collection *its_build_mapvi_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
struct its_collection *col;
col = dev_event_to_col(desc->its_mapvi_cmd.dev,
desc->its_mapvi_cmd.event_id);
its_encode_cmd(cmd, GITS_CMD_MAPVI);
its_encode_devid(cmd, desc->its_mapvi_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_mapvi_cmd.event_id);
its_encode_phys_id(cmd, desc->its_mapvi_cmd.phys_id);
its_encode_collection(cmd, desc->its_mapvi_cmd.dev->collection->col_id);
its_encode_collection(cmd, col->col_id);
its_fixup_cmd(cmd);
return desc->its_mapvi_cmd.dev->collection;
return col;
}
static struct its_collection *its_build_movi_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
struct its_collection *col;
col = dev_event_to_col(desc->its_movi_cmd.dev,
desc->its_movi_cmd.event_id);
its_encode_cmd(cmd, GITS_CMD_MOVI);
its_encode_devid(cmd, desc->its_movi_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_movi_cmd.id);
its_encode_event_id(cmd, desc->its_movi_cmd.event_id);
its_encode_collection(cmd, desc->its_movi_cmd.col->col_id);
its_fixup_cmd(cmd);
return desc->its_movi_cmd.dev->collection;
return col;
}
static struct its_collection *its_build_discard_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
struct its_collection *col;
col = dev_event_to_col(desc->its_discard_cmd.dev,
desc->its_discard_cmd.event_id);
its_encode_cmd(cmd, GITS_CMD_DISCARD);
its_encode_devid(cmd, desc->its_discard_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_discard_cmd.event_id);
its_fixup_cmd(cmd);
return desc->its_discard_cmd.dev->collection;
return col;
}
static struct its_collection *its_build_inv_cmd(struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
struct its_collection *col;
col = dev_event_to_col(desc->its_inv_cmd.dev,
desc->its_inv_cmd.event_id);
its_encode_cmd(cmd, GITS_CMD_INV);
its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_inv_cmd.event_id);
its_fixup_cmd(cmd);
return desc->its_inv_cmd.dev->collection;
return col;
}
static struct its_collection *its_build_invall_cmd(struct its_cmd_block *cmd,
@ -497,7 +529,7 @@ static void its_send_movi(struct its_device *dev,
desc.its_movi_cmd.dev = dev;
desc.its_movi_cmd.col = col;
desc.its_movi_cmd.id = id;
desc.its_movi_cmd.event_id = id;
its_send_single_command(dev->its, its_build_movi_cmd, &desc);
}
@ -528,7 +560,7 @@ static void its_send_invall(struct its_node *its, struct its_collection *col)
static inline u32 its_get_event_id(struct irq_data *d)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
return d->hwirq - its_dev->lpi_base;
return d->hwirq - its_dev->event_map.lpi_base;
}
static void lpi_set_config(struct irq_data *d, bool enable)
@ -583,7 +615,7 @@ static int its_set_affinity(struct irq_data *d, const struct cpumask *mask_val,
target_col = &its_dev->its->collections[cpu];
its_send_movi(its_dev, target_col, id);
its_dev->collection = target_col;
its_dev->event_map.col_map[id] = cpu;
return IRQ_SET_MASK_OK_DONE;
}
@ -713,8 +745,10 @@ out:
return bitmap;
}
static void its_lpi_free(unsigned long *bitmap, int base, int nr_ids)
static void its_lpi_free(struct event_lpi_map *map)
{
int base = map->lpi_base;
int nr_ids = map->nr_lpis;
int lpi;
spin_lock(&lpi_lock);
@ -731,7 +765,8 @@ static void its_lpi_free(unsigned long *bitmap, int base, int nr_ids)
spin_unlock(&lpi_lock);
kfree(bitmap);
kfree(map->lpi_map);
kfree(map->col_map);
}
/*
@ -1099,11 +1134,11 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
struct its_device *dev;
unsigned long *lpi_map;
unsigned long flags;
u16 *col_map = NULL;
void *itt;
int lpi_base;
int nr_lpis;
int nr_ites;
int cpu;
int sz;
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
@ -1117,20 +1152,24 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
itt = kzalloc(sz, GFP_KERNEL);
lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis);
if (lpi_map)
col_map = kzalloc(sizeof(*col_map) * nr_lpis, GFP_KERNEL);
if (!dev || !itt || !lpi_map) {
if (!dev || !itt || !lpi_map || !col_map) {
kfree(dev);
kfree(itt);
kfree(lpi_map);
kfree(col_map);
return NULL;
}
dev->its = its;
dev->itt = itt;
dev->nr_ites = nr_ites;
dev->lpi_map = lpi_map;
dev->lpi_base = lpi_base;
dev->nr_lpis = nr_lpis;
dev->event_map.lpi_map = lpi_map;
dev->event_map.col_map = col_map;
dev->event_map.lpi_base = lpi_base;
dev->event_map.nr_lpis = nr_lpis;
dev->device_id = dev_id;
INIT_LIST_HEAD(&dev->entry);
@ -1138,10 +1177,6 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
list_add(&dev->entry, &its->its_device_list);
raw_spin_unlock_irqrestore(&its->lock, flags);
/* Bind the device to the first possible CPU */
cpu = cpumask_first(cpu_online_mask);
dev->collection = &its->collections[cpu];
/* Map device to its ITT */
its_send_mapd(dev, 1);
@ -1163,12 +1198,13 @@ static int its_alloc_device_irq(struct its_device *dev, irq_hw_number_t *hwirq)
{
int idx;
idx = find_first_zero_bit(dev->lpi_map, dev->nr_lpis);
if (idx == dev->nr_lpis)
idx = find_first_zero_bit(dev->event_map.lpi_map,
dev->event_map.nr_lpis);
if (idx == dev->event_map.nr_lpis)
return -ENOSPC;
*hwirq = dev->lpi_base + idx;
set_bit(idx, dev->lpi_map);
*hwirq = dev->event_map.lpi_base + idx;
set_bit(idx, dev->event_map.lpi_map);
return 0;
}
@ -1288,7 +1324,8 @@ static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
irq_domain_set_hwirq_and_chip(domain, virq + i,
hwirq, &its_irq_chip, its_dev);
dev_dbg(info->scratchpad[1].ptr, "ID:%d pID:%d vID:%d\n",
(int)(hwirq - its_dev->lpi_base), (int)hwirq, virq + i);
(int)(hwirq - its_dev->event_map.lpi_base),
(int)hwirq, virq + i);
}
return 0;
@ -1300,6 +1337,9 @@ static void its_irq_domain_activate(struct irq_domain *domain,
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
u32 event = its_get_event_id(d);
/* Bind the LPI to the first possible CPU */
its_dev->event_map.col_map[event] = cpumask_first(cpu_online_mask);
/* Map the GIC IRQ and event to the device */
its_send_mapvi(its_dev, d->hwirq, event);
}
@ -1327,17 +1367,16 @@ static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
u32 event = its_get_event_id(data);
/* Mark interrupt index as unused */
clear_bit(event, its_dev->lpi_map);
clear_bit(event, its_dev->event_map.lpi_map);
/* Nuke the entry in the domain */
irq_domain_reset_irq_data(data);
}
/* If all interrupts have been freed, start mopping the floor */
if (bitmap_empty(its_dev->lpi_map, its_dev->nr_lpis)) {
its_lpi_free(its_dev->lpi_map,
its_dev->lpi_base,
its_dev->nr_lpis);
if (bitmap_empty(its_dev->event_map.lpi_map,
its_dev->event_map.nr_lpis)) {
its_lpi_free(&its_dev->event_map);
/* Unmap device/itt */
its_send_mapd(its_dev, 0);

9
kernel/cpu.c
View File

@ -527,18 +527,9 @@ static int _cpu_up(unsigned int cpu, int tasks_frozen)
goto out_notify;
}
/*
* Some architectures have to walk the irq descriptors to
* setup the vector space for the cpu which comes online.
* Prevent irq alloc/free across the bringup.
*/
irq_lock_sparse();
/* Arch-specific enabling code. */
ret = __cpu_up(cpu, idle);
irq_unlock_sparse();
if (ret != 0)
goto out_notify;
BUG_ON(!cpu_online(cpu));

18
kernel/irq/resend.c
View File

@ -75,13 +75,21 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
!desc->irq_data.chip->irq_retrigger(&desc->irq_data)) {
#ifdef CONFIG_HARDIRQS_SW_RESEND
/*
* If the interrupt has a parent irq and runs
* in the thread context of the parent irq,
* retrigger the parent.
* If the interrupt is running in the thread
* context of the parent irq we need to be
* careful, because we cannot trigger it
* directly.
*/
if (desc->parent_irq &&
irq_settings_is_nested_thread(desc))
if (irq_settings_is_nested_thread(desc)) {
/*
* If the parent_irq is valid, we
* retrigger the parent, otherwise we
* do nothing.
*/
if (!desc->parent_irq)
return;
irq = desc->parent_irq;
}
/* Set it pending and activate the softirq: */
set_bit(irq, irqs_resend);
tasklet_schedule(&resend_tasklet);