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misc: mic: add threaded irq support in host driver 

Convert mic_request_irq to mic_request_threaded_irq to support threaded
irq for virtual devices on mic bus.

Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: Nikhil Rao <nikhil.rao@intel.com>
Reviewed-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Siva Yerramreddy <yshivakrishna@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Siva Yerramreddy 2014-07-11 14:04:22 -07:00 committed by Greg Kroah-Hartman
parent 726526c355
commit b8e439f48a
4 changed files with 96 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

121
drivers/misc/mic/host/mic_intr.c
View File

@ -24,28 +24,29 @@
#include "../common/mic_dev.h"
#include "mic_device.h"
/*
* mic_invoke_callback - Invoke callback functions registered for
* the corresponding source id.
*
* @mdev: pointer to the mic_device instance
* @idx: The interrupt source id.
*
* Returns none.
*/
static inline void mic_invoke_callback(struct mic_device *mdev, int idx)
static irqreturn_t mic_thread_fn(int irq, void *dev)
{
struct mic_device *mdev = dev;
struct mic_intr_info *intr_info = mdev->intr_info;
struct mic_irq_info *irq_info = &mdev->irq_info;
struct mic_intr_cb *intr_cb;
struct pci_dev *pdev = container_of(mdev->sdev->parent,
struct pci_dev, dev);
struct pci_dev, dev);
int i;
spin_lock(&mdev->irq_info.mic_intr_lock);
list_for_each_entry(intr_cb, &mdev->irq_info.cb_list[idx], list)
if (intr_cb->func)
intr_cb->func(pdev->irq, intr_cb->data);
spin_unlock(&mdev->irq_info.mic_intr_lock);
spin_lock(&irq_info->mic_thread_lock);
for (i = intr_info->intr_start_idx[MIC_INTR_DB];
i < intr_info->intr_len[MIC_INTR_DB]; i++)
if (test_and_clear_bit(i, &irq_info->mask)) {
list_for_each_entry(intr_cb, &irq_info->cb_list[i],
list)
if (intr_cb->thread_fn)
intr_cb->thread_fn(pdev->irq,
intr_cb->data);
}
spin_unlock(&irq_info->mic_thread_lock);
return IRQ_HANDLED;
}
/**
* mic_interrupt - Generic interrupt handler for
* MSI and INTx based interrupts.
@ -53,7 +54,11 @@ static inline void mic_invoke_callback(struct mic_device *mdev, int idx)
static irqreturn_t mic_interrupt(int irq, void *dev)
{
struct mic_device *mdev = dev;
struct mic_intr_info *info = mdev->intr_info;
struct mic_intr_info *intr_info = mdev->intr_info;
struct mic_irq_info *irq_info = &mdev->irq_info;
struct mic_intr_cb *intr_cb;
struct pci_dev *pdev = container_of(mdev->sdev->parent,
struct pci_dev, dev);
u32 mask;
int i;
@ -61,12 +66,19 @@ static irqreturn_t mic_interrupt(int irq, void *dev)
if (!mask)
return IRQ_NONE;
for (i = info->intr_start_idx[MIC_INTR_DB];
i < info->intr_len[MIC_INTR_DB]; i++)
if (mask & BIT(i))
mic_invoke_callback(mdev, i);
return IRQ_HANDLED;
spin_lock(&irq_info->mic_intr_lock);
for (i = intr_info->intr_start_idx[MIC_INTR_DB];
i < intr_info->intr_len[MIC_INTR_DB]; i++)
if (mask & BIT(i)) {
list_for_each_entry(intr_cb, &irq_info->cb_list[i],
list)
if (intr_cb->handler)
intr_cb->handler(pdev->irq,
intr_cb->data);
set_bit(i, &irq_info->mask);
}
spin_unlock(&irq_info->mic_intr_lock);
return IRQ_WAKE_THREAD;
}
/* Return the interrupt offset from the index. Index is 0 based. */
@ -99,14 +111,15 @@ static struct msix_entry *mic_get_available_vector(struct mic_device *mdev)
*
* @mdev: pointer to the mic_device instance
* @idx: The source id to be registered.
* @func: The function to be called when the source id receives
* @handler: The function to be called when the source id receives
* the interrupt.
* @thread_fn: thread fn. corresponding to the handler
* @data: Private data of the requester.
* Return the callback structure that was registered or an
* appropriate error on failure.
*/
static struct mic_intr_cb *mic_register_intr_callback(struct mic_device *mdev,
u8 idx, irqreturn_t (*func) (int irq, void *dev),
u8 idx, irq_handler_t handler, irq_handler_t thread_fn,
void *data)
{
struct mic_intr_cb *intr_cb;
@ -117,7 +130,8 @@ static struct mic_intr_cb *mic_register_intr_callback(struct mic_device *mdev,
if (!intr_cb)
return ERR_PTR(-ENOMEM);
intr_cb->func = func;
intr_cb->handler = handler;
intr_cb->thread_fn = thread_fn;
intr_cb->data = data;
intr_cb->cb_id = ida_simple_get(&mdev->irq_info.cb_ida,
0, 0, GFP_KERNEL);
@ -126,9 +140,11 @@ static struct mic_intr_cb *mic_register_intr_callback(struct mic_device *mdev,
goto ida_fail;
}
spin_lock(&mdev->irq_info.mic_thread_lock);
spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags);
list_add_tail(&intr_cb->list, &mdev->irq_info.cb_list[idx]);
spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags);
spin_unlock(&mdev->irq_info.mic_thread_lock);
return intr_cb;
ida_fail:
@ -152,8 +168,9 @@ static u8 mic_unregister_intr_callback(struct mic_device *mdev, u32 idx)
unsigned long flags;
int i;
spin_lock(&mdev->irq_info.mic_thread_lock);
spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags);
for (i = 0; i < MIC_NUM_OFFSETS; i++) {
spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags);
list_for_each_safe(pos, tmp, &mdev->irq_info.cb_list[i]) {
intr_cb = list_entry(pos, struct mic_intr_cb, list);
if (intr_cb->cb_id == idx) {
@ -163,11 +180,13 @@ static u8 mic_unregister_intr_callback(struct mic_device *mdev, u32 idx)
kfree(intr_cb);
spin_unlock_irqrestore(
&mdev->irq_info.mic_intr_lock, flags);
spin_unlock(&mdev->irq_info.mic_thread_lock);
return i;
}
}
spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags);
}
spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags);
spin_unlock(&mdev->irq_info.mic_thread_lock);
return MIC_NUM_OFFSETS;
}
@ -242,6 +261,7 @@ static int mic_setup_callbacks(struct mic_device *mdev)
INIT_LIST_HEAD(&mdev->irq_info.cb_list[i]);
ida_init(&mdev->irq_info.cb_ida);
spin_lock_init(&mdev->irq_info.mic_intr_lock);
spin_lock_init(&mdev->irq_info.mic_thread_lock);
return 0;
}
@ -258,14 +278,12 @@ static void mic_release_callbacks(struct mic_device *mdev)
struct mic_intr_cb *intr_cb;
int i;
spin_lock(&mdev->irq_info.mic_thread_lock);
spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags);
for (i = 0; i < MIC_NUM_OFFSETS; i++) {
spin_lock_irqsave(&mdev->irq_info.mic_intr_lock, flags);
if (list_empty(&mdev->irq_info.cb_list[i])) {
spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock,
flags);
if (list_empty(&mdev->irq_info.cb_list[i]))
break;
}
list_for_each_safe(pos, tmp, &mdev->irq_info.cb_list[i]) {
intr_cb = list_entry(pos, struct mic_intr_cb, list);
@ -274,8 +292,9 @@ static void mic_release_callbacks(struct mic_device *mdev)
intr_cb->cb_id);
kfree(intr_cb);
}
spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags);
}
spin_unlock_irqrestore(&mdev->irq_info.mic_intr_lock, flags);
spin_unlock(&mdev->irq_info.mic_thread_lock);
ida_destroy(&mdev->irq_info.cb_ida);
kfree(mdev->irq_info.cb_list);
}
@ -313,7 +332,8 @@ static int mic_setup_msi(struct mic_device *mdev, struct pci_dev *pdev)
goto err_nomem2;
}
rc = request_irq(pdev->irq, mic_interrupt, 0 , "mic-msi", mdev);
rc = request_threaded_irq(pdev->irq, mic_interrupt, mic_thread_fn,
0, "mic-msi", mdev);
if (rc) {
dev_err(&pdev->dev, "Error allocating MSI interrupt\n");
goto err_irq_req_fail;
@ -353,8 +373,8 @@ static int mic_setup_intx(struct mic_device *mdev, struct pci_dev *pdev)
goto err_nomem;
}
rc = request_irq(pdev->irq, mic_interrupt,
IRQF_SHARED, "mic-intx", mdev);
rc = request_threaded_irq(pdev->irq, mic_interrupt, mic_thread_fn,
IRQF_SHARED, "mic-intx", mdev);
if (rc)
goto err;
@ -391,13 +411,14 @@ int mic_next_db(struct mic_device *mdev)
#define MK_COOKIE(x, y) ((x) | (y) << COOKIE_ID_SHIFT)
/**
* mic_request_irq - request an irq. mic_mutex needs
* mic_request_threaded_irq - request an irq. mic_mutex needs
* to be held before calling this function.
*
* @mdev: pointer to mic_device instance
* @func: The callback function that handles the interrupt.
* @handler: The callback function that handles the interrupt.
* The function needs to call ack_interrupts
* (mdev->ops->ack_interrupt(mdev)) when handling the interrupts.
* @thread_fn: thread fn required by request_threaded_irq.
* @name: The ASCII name of the callee requesting the irq.
* @data: private data that is returned back when calling the
* function handler.
@ -412,10 +433,11 @@ int mic_next_db(struct mic_device *mdev)
* error code.
*
*/
struct mic_irq *mic_request_irq(struct mic_device *mdev,
irqreturn_t (*func)(int irq, void *dev),
const char *name, void *data, int intr_src,
enum mic_intr_type type)
struct mic_irq *
mic_request_threaded_irq(struct mic_device *mdev,
irq_handler_t handler, irq_handler_t thread_fn,
const char *name, void *data, int intr_src,
enum mic_intr_type type)
{
u16 offset;
int rc = 0;
@ -444,7 +466,8 @@ struct mic_irq *mic_request_irq(struct mic_device *mdev,
goto err;
}
rc = request_irq(msix->vector, func, 0, name, data);
rc = request_threaded_irq(msix->vector, handler, thread_fn,
0, name, data);
if (rc) {
dev_dbg(mdev->sdev->parent,
"request irq failed rc = %d\n", rc);
@ -458,8 +481,8 @@ struct mic_irq *mic_request_irq(struct mic_device *mdev,
dev_dbg(mdev->sdev->parent, "irq: %d assigned for src: %d\n",
msix->vector, intr_src);
} else {
intr_cb = mic_register_intr_callback(mdev,
offset, func, data);
intr_cb = mic_register_intr_callback(mdev, offset, handler,
thread_fn, data);
if (IS_ERR(intr_cb)) {
dev_err(mdev->sdev->parent,
"No available callback entries for use\n");
@ -487,9 +510,9 @@ err:
* needs to be held before calling this function.
*
* @mdev: pointer to mic_device instance
* @cookie: cookie obtained during a successful call to mic_request_irq
* @cookie: cookie obtained during a successful call to mic_request_threaded_irq
* @data: private data specified by the calling function during the
* mic_request_irq
* mic_request_threaded_irq
*
* returns: none.
*/

24
drivers/misc/mic/host/mic_intr.h
View File

@ -21,6 +21,8 @@
#ifndef _MIC_INTR_H_
#define _MIC_INTR_H_
#include <linux/bitops.h>
#include <linux/interrupt.h>
/*
* The minimum number of msix vectors required for normal operation.
* 3 for virtio network, console and block devices.
@ -68,7 +70,11 @@ struct mic_intr_info {
* @num_vectors: The number of MSI/MSI-x vectors that have been allocated.
* @cb_ida: callback ID allocator to track the callbacks registered.
* @mic_intr_lock: spinlock to protect the interrupt callback list.
* @mic_thread_lock: spinlock to protect the thread callback list.
* This lock is used to protect against thread_fn while
* mic_intr_lock is used to protect against interrupt handler.
* @cb_list: Array of callback lists one for each source.
* @mask: Mask used by the main thread fn to call the underlying thread fns.
*/
struct mic_irq_info {
int next_avail_src;
@ -77,19 +83,23 @@ struct mic_irq_info {
u16 num_vectors;
struct ida cb_ida;
spinlock_t mic_intr_lock;
spinlock_t mic_thread_lock;
struct list_head *cb_list;
unsigned long mask;
};
/**
* struct mic_intr_cb - Interrupt callback structure.
*
* @func: The callback function
* @handler: The callback function
* @thread_fn: The thread_fn.
* @data: Private data of the requester.
* @cb_id: The callback id. Identifies this callback.
* @list: list head pointing to the next callback structure.
*/
struct mic_intr_cb {
irqreturn_t (*func) (int irq, void *data);
irq_handler_t handler;
irq_handler_t thread_fn;
void *data;
int cb_id;
struct list_head list;
@ -124,11 +134,11 @@ struct mic_hw_intr_ops {
};
int mic_next_db(struct mic_device *mdev);
struct mic_irq *mic_request_irq(struct mic_device *mdev,
irqreturn_t (*func)(int irq, void *data),
const char *name, void *data, int intr_src,
enum mic_intr_type type);
struct mic_irq *
mic_request_threaded_irq(struct mic_device *mdev,
irq_handler_t handler, irq_handler_t thread_fn,
const char *name, void *data, int intr_src,
enum mic_intr_type type);
void mic_free_irq(struct mic_device *mdev,
struct mic_irq *cookie, void *data);
int mic_setup_interrupts(struct mic_device *mdev, struct pci_dev *pdev);

5
drivers/misc/mic/host/mic_main.c
View File

@ -389,8 +389,9 @@ static int mic_probe(struct pci_dev *pdev,
mutex_lock(&mdev->mic_mutex);
mdev->shutdown_db = mic_next_db(mdev);
mdev->shutdown_cookie = mic_request_irq(mdev, mic_shutdown_db,
"shutdown-interrupt", mdev, mdev->shutdown_db, MIC_INTR_DB);
mdev->shutdown_cookie = mic_request_threaded_irq(mdev, mic_shutdown_db,
NULL, "shutdown-interrupt", mdev,
mdev->shutdown_db, MIC_INTR_DB);
if (IS_ERR(mdev->shutdown_cookie)) {
rc = PTR_ERR(mdev->shutdown_cookie);
mutex_unlock(&mdev->mic_mutex);

6
drivers/misc/mic/host/mic_virtio.c
View File

@ -594,8 +594,10 @@ int mic_virtio_add_device(struct mic_vdev *mvdev,
snprintf(irqname, sizeof(irqname), "mic%dvirtio%d", mdev->id,
mvdev->virtio_id);
mvdev->virtio_db = mic_next_db(mdev);
mvdev->virtio_cookie = mic_request_irq(mdev, mic_virtio_intr_handler,
irqname, mvdev, mvdev->virtio_db, MIC_INTR_DB);
mvdev->virtio_cookie = mic_request_threaded_irq(mdev,
mic_virtio_intr_handler,
NULL, irqname, mvdev,
mvdev->virtio_db, MIC_INTR_DB);
if (IS_ERR(mvdev->virtio_cookie)) {
ret = PTR_ERR(mvdev->virtio_cookie);
dev_dbg(mdev->sdev->parent, "request irq failed\n");