From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org
Cc: dmaengine@vger.kernel.org, yixin.zhang@intel.com
Subject: [PATCH] dmaengine: idxd: cleanup workqueue config after disabling
Date: Fri, 15 May 2020 12:24:17 -0700 [thread overview]
Message-ID: <158957065768.11894.4009779253452766084.stgit@djiang5-desk3.ch.intel.com> (raw)
After disabling a device, we should clean up the internal state for
the wqs and zero out the configuration registers. Without doing so can cause
issues when the user reprogram the wqs.
Reported-by: Yixin Zhang <yixin.zhang@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Yixin Zhang <yixin.zhang@intel.com>
---
drivers/dma/idxd/device.c | 24 ++++++++++++++++++++++++
drivers/dma/idxd/idxd.h | 1 +
drivers/dma/idxd/sysfs.c | 5 +++++
3 files changed, 30 insertions(+)
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 4669986fe018..104bb5b1bad2 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -325,6 +325,30 @@ void idxd_wq_unmap_portal(struct idxd_wq *wq)
devm_iounmap(dev, wq->dportal);
}
+void idxd_wq_disable_cleanup(struct idxd_wq *wq)
+{
+ struct idxd_device *idxd = wq->idxd;
+ struct device *dev = &idxd->pdev->dev;
+ int i, wq_offset;
+
+ memset(&wq->wqcfg, 0, sizeof(wq->wqcfg));
+ wq->type = IDXD_WQT_NONE;
+ wq->size = 0;
+ wq->group = NULL;
+ wq->threshold = 0;
+ wq->priority = 0;
+ clear_bit(WQ_FLAG_DEDICATED, &wq->flags);
+ memset(wq->name, 0, WQ_NAME_SIZE);
+
+ for (i = 0; i < 8; i++) {
+ wq_offset = idxd->wqcfg_offset + wq->id * 32 + i * sizeof(u32);
+ iowrite32(0, idxd->reg_base + wq_offset);
+ dev_dbg(dev, "WQ[%d][%d][%#x]: %#x\n",
+ wq->id, i, wq_offset,
+ ioread32(idxd->reg_base + wq_offset));
+ }
+}
+
/* Device control bits */
static inline bool idxd_is_enabled(struct idxd_device *idxd)
{
diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h
index 9a69738e355d..3dfac462a0df 100644
--- a/drivers/dma/idxd/idxd.h
+++ b/drivers/dma/idxd/idxd.h
@@ -292,6 +292,7 @@ int idxd_wq_disable(struct idxd_wq *wq, unsigned long *irq_flags);
void idxd_wq_drain(struct idxd_wq *wq, unsigned long *irq_flags);
int idxd_wq_map_portal(struct idxd_wq *wq);
void idxd_wq_unmap_portal(struct idxd_wq *wq);
+void idxd_wq_disable_cleanup(struct idxd_wq *wq);
/* submission */
int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc);
diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index 709a576a25e6..df585b0829db 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -317,6 +317,11 @@ static int idxd_config_bus_remove(struct device *dev)
idxd_unregister_dma_device(idxd);
spin_lock_irqsave(&idxd->dev_lock, flags);
rc = idxd_device_disable(idxd, &flags);
+ for (i = 0; i < idxd->max_wqs; i++) {
+ struct idxd_wq *wq = &idxd->wqs[i];
+
+ idxd_wq_disable_cleanup(wq);
+ }
spin_unlock_irqrestore(&idxd->dev_lock, flags);
module_put(THIS_MODULE);
if (rc < 0)
next reply other threads:[~2020-05-15 19:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-15 19:24 Dave Jiang [this message]
2020-06-05 18:59 ` [PATCH] dmaengine: idxd: cleanup workqueue config after disabling Dave Jiang
2020-06-24 7:31 ` Vinod Koul
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