Re: [PATCH v4 3/3] crypto: hisilicon/qm - defining the device isolation strategy
From: yekai(A)
Date: Mon Jun 27 2022 - 08:10:09 EST
On 2022/6/23 17:05, Greg KH wrote:
On Thu, Jun 23, 2022 at 02:14:52PM +0800, Kai Ye wrote:
Define the device isolation strategy by the device driver. The
user configures a frequency value by uacce interface. If the
slot reset frequency exceeds the value of setting for a certain
period of time, the device will not be available in user space.
This frequency is an abstract number of times that can be
considered to occur in a time window. The time window can be set
to one hour or one day. The VF device use the PF device isolation
strategy. All the hardware errors are processed by PF driver.
Signed-off-by: Kai Ye <yekai13@xxxxxxxxxx>
---
drivers/crypto/hisilicon/qm.c | 177 +++++++++++++++++++++++++++++++---
include/linux/hisi_acc_qm.h | 9 ++
2 files changed, 174 insertions(+), 12 deletions(-)
diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index ad83c194d664..f92cf20fc84e 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -417,6 +417,16 @@ struct hisi_qm_resource {
struct list_head list;
};
+/**
+ * struct qm_hw_err - structure of describes the device err
+ * @list: hardware error list
+ * @timestamp: timestamp when the error occurred
+ */
+struct qm_hw_err {
+ struct list_head list;
+ unsigned long long timestamp;
+};
+
struct hisi_qm_hw_ops {
int (*get_vft)(struct hisi_qm *qm, u32 *base, u32 *number);
void (*qm_db)(struct hisi_qm *qm, u16 qn,
@@ -3410,6 +3420,125 @@ static long hisi_qm_uacce_ioctl(struct uacce_queue *q, unsigned int cmd,
return 0;
}
+/**
+ * qm_hw_err_isolate() - Try to isolate the uacce device with its VFs
+ * according to user's configuration of isolation strategy. Warning: this
+ * API should be called while there the users on this device are suspended
+ * by slot resetting preparation of PCI AER.
+ * @qm: the uacce device
+ */
+static int qm_hw_err_isolate(struct hisi_qm *qm)
+{
+ struct qm_hw_err *err, *tmp, *hw_err;
+ struct qm_err_isolate *isolate;
+ u32 count = 0;
+
+ isolate = &qm->isolate_data;
+
+#define SECONDS_PER_HOUR 3600
+
+ /* All the hw errs are processed by PF driver */
+ if (qm->uacce->is_vf || atomic_read(&isolate->is_isolate) ||
+ !isolate->hw_err_isolate_hz)
+ return 0;
+
+ hw_err = kzalloc(sizeof(*hw_err), GFP_ATOMIC);
+ if (!hw_err)
+ return -ENOMEM;
+
+ mutex_lock(&isolate->isolate_lock);
+ hw_err->timestamp = jiffies;
+ list_for_each_entry_safe(err, tmp, &qm->uacce_hw_errs, list) {
+ if ((hw_err->timestamp - err->timestamp) / HZ >
+ SECONDS_PER_HOUR) {
+ list_del(&err->list);
+ kfree(err);
+ } else {
+ count++;
+ }
+ }
+ list_add(&hw_err->list, &qm->uacce_hw_errs);
+ mutex_unlock(&isolate->isolate_lock);
+
+ if (count >= isolate->hw_err_isolate_hz)
+ atomic_set(&isolate->is_isolate, 1);
Why is this an atomic value? You can change it after it has been set,
and it can be modified after it is read. A normal 'bool' would work
exactly the same.
Yes A normal 'bool' is good.
+
+ return 0;
+}
+
+static void qm_hw_err_destroy(struct hisi_qm *qm)
+{
+ struct qm_hw_err *err, *tmp;
+
+ mutex_lock(&qm->isolate_data.isolate_lock);
+ list_for_each_entry_safe(err, tmp, &qm->uacce_hw_errs, list) {
+ list_del(&err->list);
+ kfree(err);
+ }
+ mutex_unlock(&qm->isolate_data.isolate_lock);
+}
+
+static enum uacce_dev_state hisi_qm_get_isolate_state(struct uacce_device *uacce)
+{
+ struct hisi_qm *qm = uacce->priv;
+ struct hisi_qm *pf_qm;
+
+ if (uacce->is_vf)
+ pf_qm = pci_get_drvdata(pci_physfn(qm->pdev));
+ else
+ pf_qm = qm;
+
+ return atomic_read(&pf_qm->isolate_data.is_isolate) ?
+ UACCE_DEV_ISOLATE : UACCE_DEV_NORMAL;
+}
+
+static int hisi_qm_isolate_strategy_write(struct uacce_device *uacce,
+ const char *buf, size_t len)
+{
+ struct hisi_qm *qm = uacce->priv;
+ unsigned long val;
+
+#define MAX_ISOLATE_STRATEGY 65535
What is this value? Please document it better.
Specified maximum frequency, and will move this value to uacce.
+
+ /* Must be set by PF */
+ if (uacce->is_vf) {
+ dev_info(&qm->pdev->dev, "the isolation strategy must be set by PF.\n");
Do not let userspace spam the kernel log for no good reason.
And why is this an info?
delete it.
+ return -EINVAL;
This looks like an error.
+ }
+
+ if (atomic_read(&qm->isolate_data.is_isolate))
+ return -EINVAL;
What happens if this changes right after reading it?
It is meaningless to configure a count that has been isolated.
+
+ if (kstrtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (val > MAX_ISOLATE_STRATEGY)
+ return -EINVAL;
+
+ qm->isolate_data.hw_err_isolate_hz = val;
+
+ /* After the policy is updated, need to reset the hardware err list */
+ qm_hw_err_destroy(qm);
+
+ return 0;
Don't you need to return the number of bytes read, not 0?
+}
+
+static int hisi_qm_isolate_strategy_read(struct uacce_device *uacce, char *buf)
+{
+ struct hisi_qm *qm = uacce->priv;
+ struct hisi_qm *pf_qm;
+ unsigned long val;
+
+ if (uacce->is_vf) {
+ pf_qm = pci_get_drvdata(pci_physfn(qm->pdev));
+ val = pf_qm->isolate_data.hw_err_isolate_hz;
+ } else {
+ val = qm->isolate_data.hw_err_isolate_hz;
+ }
+
+ return sysfs_emit(buf, "%lu\n", val);
+}
+
static const struct uacce_ops uacce_qm_ops = {
.get_available_instances = hisi_qm_get_available_instances,
.get_queue = hisi_qm_uacce_get_queue,
@@ -3419,8 +3548,22 @@ static const struct uacce_ops uacce_qm_ops = {
.mmap = hisi_qm_uacce_mmap,
.ioctl = hisi_qm_uacce_ioctl,
.is_q_updated = hisi_qm_is_q_updated,
+ .get_isolate_state = hisi_qm_get_isolate_state,
+ .isolate_strategy_write = hisi_qm_isolate_strategy_write,
+ .isolate_strategy_read = hisi_qm_isolate_strategy_read,
};
+static void qm_remove_uacce(struct hisi_qm *qm)
+{
+ struct uacce_device *uacce = qm->uacce;
+
+ if (qm->use_sva) {
+ qm_hw_err_destroy(qm);
+ uacce_remove(uacce);
+ qm->uacce = NULL;
+ }
+}
+
static int qm_alloc_uacce(struct hisi_qm *qm)
{
struct pci_dev *pdev = qm->pdev;
@@ -3433,6 +3576,8 @@ static int qm_alloc_uacce(struct hisi_qm *qm)
};
int ret;
+ INIT_LIST_HEAD(&qm->uacce_hw_errs);
+ mutex_init(&qm->isolate_data.isolate_lock);
ret = strscpy(interface.name, dev_driver_string(&pdev->dev),
sizeof(interface.name));
if (ret < 0)
@@ -3446,8 +3591,7 @@ static int qm_alloc_uacce(struct hisi_qm *qm)
qm->use_sva = true;
} else {
/* only consider sva case */
- uacce_remove(uacce);
- qm->uacce = NULL;
+ qm_remove_uacce(qm);
return -EINVAL;
}
@@ -5109,6 +5253,12 @@ static int qm_controller_reset_prepare(struct hisi_qm *qm)
return ret;
}
+ if (qm->use_sva) {
+ ret = qm_hw_err_isolate(qm);
+ if (ret)
+ pci_err(pdev, "failed to isolate hw err!\n");
+ }
+
ret = qm_wait_vf_prepare_finish(qm);
if (ret)
pci_err(pdev, "failed to stop by vfs in soft reset!\n");
@@ -5436,19 +5586,25 @@ static int qm_controller_reset(struct hisi_qm *qm)
ret = qm_soft_reset(qm);
if (ret) {
pci_err(pdev, "Controller reset failed (%d)\n", ret);
- qm_reset_bit_clear(qm);
- return ret;
+ goto err_reset;
}
ret = qm_controller_reset_done(qm);
- if (ret) {
- qm_reset_bit_clear(qm);
- return ret;
- }
+ if (ret)
+ goto err_reset;
pci_info(pdev, "Controller reset complete\n");
return 0;
+
+err_reset:
+ pci_err(pdev, "Controller reset failed (%d)\n", ret);
+ qm_reset_bit_clear(qm);
+
+ /* if resetting fails, isolate the device */
+ if (qm->use_sva && !qm->uacce->is_vf)
+ atomic_set(&qm->isolate_data.is_isolate, 1);
+ return ret;
}
/**
@@ -6246,10 +6402,7 @@ int hisi_qm_init(struct hisi_qm *qm)
err_free_qm_memory:
hisi_qm_memory_uninit(qm);
err_alloc_uacce:
- if (qm->use_sva) {
- uacce_remove(qm->uacce);
- qm->uacce = NULL;
- }
+ qm_remove_uacce(qm);
err_irq_register:
qm_irq_unregister(qm);
err_pci_init:
diff --git a/include/linux/hisi_acc_qm.h b/include/linux/hisi_acc_qm.h
index 116e8bd68c99..44454150c205 100644
--- a/include/linux/hisi_acc_qm.h
+++ b/include/linux/hisi_acc_qm.h
@@ -271,6 +271,13 @@ struct hisi_qm_poll_data {
u16 *qp_finish_id;
};
+struct qm_err_isolate {
+ struct mutex isolate_lock;
+ /* user cfg freq which triggers isolation */
+ u32 hw_err_isolate_hz;
+ atomic_t is_isolate;
Again, why is this an atomic value?
Yes, bool can be used.
thanks,
greg k-h
.
thanks
Kai