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crypto: qat - adf_dev_stop should not be called in atomic context 

VFs call adf_dev_stop() from a PF to VF interrupt bottom half.
This causes an oops "scheduling while atomic", because it tries
to acquire a mutex to un-register crypto algorithms.
This patch fixes the issue by calling adf_dev_stop() asynchronously.

Changes in v2:
 - change kthread to a work queue.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Tadeusz Struk 2016-04-06 11:01:54 -07:00 committed by Herbert Xu
parent 7587c40754
commit d6064165ba
3 changed files with 64 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/crypto/qat/qat_common/adf_common_drv.h
View File

@ -144,6 +144,8 @@ void adf_disable_aer(struct adf_accel_dev *accel_dev);
void adf_dev_restore(struct adf_accel_dev *accel_dev);
int adf_init_aer(void);
void adf_exit_aer(void);
int adf_init_vf_wq(void);
void adf_exit_vf_wq(void);
int adf_init_admin_comms(struct adf_accel_dev *accel_dev);
void adf_exit_admin_comms(struct adf_accel_dev *accel_dev);
int adf_send_admin_init(struct adf_accel_dev *accel_dev);

6
drivers/crypto/qat/qat_common/adf_ctl_drv.c
View File

@ -471,12 +471,17 @@ static int __init adf_register_ctl_device_driver(void)
if (adf_init_aer())
goto err_aer;
if (adf_init_vf_wq())
goto err_vf_wq;
if (qat_crypto_register())
goto err_crypto_register;
return 0;
err_crypto_register:
adf_exit_vf_wq();
err_vf_wq:
adf_exit_aer();
err_aer:
adf_chr_drv_destroy();
@ -489,6 +494,7 @@ static void __exit adf_unregister_ctl_device_driver(void)
{
adf_chr_drv_destroy();
adf_exit_aer();
adf_exit_vf_wq();
qat_crypto_unregister();
adf_clean_vf_map(false);
mutex_destroy(&adf_ctl_lock);

59
drivers/crypto/qat/qat_common/adf_vf_isr.c
View File

@ -51,6 +51,7 @@
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include "adf_accel_devices.h"
#include "adf_common_drv.h"
#include "adf_cfg.h"
@ -64,6 +65,13 @@
#define ADF_VINTSOU_BUN BIT(0)
#define ADF_VINTSOU_PF2VF BIT(1)
static struct workqueue_struct *adf_vf_stop_wq;
struct adf_vf_stop_data {
struct adf_accel_dev *accel_dev;
struct work_struct work;
};
static int adf_enable_msi(struct adf_accel_dev *accel_dev)
{
struct adf_accel_pci *pci_dev_info = &accel_dev->accel_pci_dev;
@ -90,6 +98,20 @@ static void adf_disable_msi(struct adf_accel_dev *accel_dev)
pci_disable_msi(pdev);
}
static void adf_dev_stop_async(struct work_struct *work)
{
struct adf_vf_stop_data *stop_data =
container_of(work, struct adf_vf_stop_data, work);
struct adf_accel_dev *accel_dev = stop_data->accel_dev;
adf_dev_stop(accel_dev);
adf_dev_shutdown(accel_dev);
/* Re-enable PF2VF interrupts */
adf_enable_pf2vf_interrupts(accel_dev);
kfree(stop_data);
}
static void adf_pf2vf_bh_handler(void *data)
{
struct adf_accel_dev *accel_dev = data;
@ -107,11 +129,27 @@ static void adf_pf2vf_bh_handler(void *data)
goto err;
switch ((msg & ADF_PF2VF_MSGTYPE_MASK) >> ADF_PF2VF_MSGTYPE_SHIFT) {
case ADF_PF2VF_MSGTYPE_RESTARTING:
case ADF_PF2VF_MSGTYPE_RESTARTING: {
struct adf_vf_stop_data *stop_data;
dev_dbg(&GET_DEV(accel_dev),
"Restarting msg received from PF 0x%x\n", msg);
adf_dev_stop(accel_dev);
break;
stop_data = kzalloc(sizeof(*stop_data), GFP_ATOMIC);
if (!stop_data) {
dev_err(&GET_DEV(accel_dev),
"Couldn't schedule stop for vf_%d\n",
accel_dev->accel_id);
return;
}
stop_data->accel_dev = accel_dev;
INIT_WORK(&stop_data->work, adf_dev_stop_async);
queue_work(adf_vf_stop_wq, &stop_data->work);
/* To ack, clear the PF2VFINT bit */
msg &= ~BIT(0);
ADF_CSR_WR(pmisc_bar_addr, hw_data->get_pf2vf_offset(0), msg);
return;
}
case ADF_PF2VF_MSGTYPE_VERSION_RESP:
dev_dbg(&GET_DEV(accel_dev),
"Version resp received from PF 0x%x\n", msg);
@ -278,3 +316,18 @@ int adf_vf_isr_resource_alloc(struct adf_accel_dev *accel_dev)
return -EFAULT;
}
EXPORT_SYMBOL_GPL(adf_vf_isr_resource_alloc);
int __init adf_init_vf_wq(void)
{
adf_vf_stop_wq = create_workqueue("adf_vf_stop_wq");
return !adf_vf_stop_wq ? -EFAULT : 0;
}
void __exit adf_exit_vf_wq(void)
{
if (adf_vf_stop_wq)
destroy_workqueue(adf_vf_stop_wq);
adf_vf_stop_wq = NULL;
}