From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>,
Alex Williamson <alex.williamson@redhat.com>,
"Lu Baolu" <baolu.lu@linux.intel.com>,
iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Jean-Philippe Brucker <jean-philippe@linaro.com>
Cc: "Yi Liu" <yi.l.liu@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>,
"Christoph Hellwig" <hch@infradead.org>,
Jonathan Cameron <jic23@kernel.org>,
Eric Auger <eric.auger@redhat.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH 09/10] iommu/ioasid: Support ioasid_set quota adjustment
Date: Wed, 25 Mar 2020 10:55:30 -0700 [thread overview]
Message-ID: <1585158931-1825-10-git-send-email-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <1585158931-1825-1-git-send-email-jacob.jun.pan@linux.intel.com>
IOASID set is allocated with an initial quota, at runtime there may be
needs to balance IOASID resources among different VMs/sets.
This patch adds a new API to adjust per set quota.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/iommu/ioasid.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/ioasid.h | 6 ++++++
2 files changed, 50 insertions(+)
diff --git a/drivers/iommu/ioasid.c b/drivers/iommu/ioasid.c
index 27dce2cb5af2..5ac28862a1db 100644
--- a/drivers/iommu/ioasid.c
+++ b/drivers/iommu/ioasid.c
@@ -578,6 +578,50 @@ void ioasid_free_set(int sid, bool destroy_set)
}
EXPORT_SYMBOL_GPL(ioasid_free_set);
+/**
+ * ioasid_adjust_set - Adjust the quota of an IOASID set
+ * @quota: Quota allowed in this set
+ * @sid: IOASID set ID to be assigned
+ *
+ * Return 0 on success. If the new quota is smaller than the number of
+ * IOASIDs already allocated, -EINVAL will be returned. No change will be
+ * made to the existing quota.
+ */
+int ioasid_adjust_set(int sid, int quota)
+{
+ struct ioasid_set_data *sdata;
+ int ret = 0;
+
+ mutex_lock(&ioasid_allocator_lock);
+ sdata = xa_load(&ioasid_sets, sid);
+ if (!sdata || sdata->nr_ioasids > quota) {
+ pr_err("Failed to adjust IOASID set %d quota %d\n",
+ sid, quota);
+ ret = -EINVAL;
+ goto done_unlock;
+ }
+
+ if (quota >= ioasid_capacity_avail) {
+ ret = -ENOSPC;
+ goto done_unlock;
+ }
+
+ /* Return the delta back to system pool */
+ ioasid_capacity_avail += sdata->size - quota;
+
+ /*
+ * May have a policy to prevent giving all available IOASIDs
+ * to one set. But we don't enforce here, it should be in the
+ * upper layers.
+ */
+ sdata->size = quota;
+
+done_unlock:
+ mutex_unlock(&ioasid_allocator_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(ioasid_adjust_set);
/**
* ioasid_find - Find IOASID data
diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
index 32d032913828..6e7de6fb91bf 100644
--- a/include/linux/ioasid.h
+++ b/include/linux/ioasid.h
@@ -73,6 +73,7 @@ int ioasid_alloc_set(struct ioasid_set *token, ioasid_t quota, int *sid);
void ioasid_free_set(int sid, bool destroy_set);
int ioasid_find_sid(ioasid_t ioasid);
int ioasid_notify(ioasid_t id, enum ioasid_notify_val cmd);
+int ioasid_adjust_set(int sid, int quota);
#else /* !CONFIG_IOASID */
static inline ioasid_t ioasid_alloc(int sid, ioasid_t min,
@@ -136,5 +137,10 @@ static inline int ioasid_alloc_system_set(int quota)
return -ENOTSUPP;
}
+static inline int ioasid_adjust_set(int sid, int quota)
+{
+ return -ENOTSUPP;
+}
+
#endif /* CONFIG_IOASID */
#endif /* __LINUX_IOASID_H */
--
2.7.4
next prev parent reply other threads:[~2020-03-25 17:50 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 17:55 [PATCH 00/10] IOASID extensions for guest SVA Jacob Pan
2020-03-25 17:55 ` [PATCH 01/10] iommu/ioasid: Introduce system-wide capacity Jacob Pan
2020-03-27 8:07 ` Tian, Kevin
2020-03-27 16:08 ` Jacob Pan
2020-04-01 13:45 ` Jean-Philippe Brucker
2020-04-01 22:50 ` Jacob Pan
2020-03-25 17:55 ` [PATCH 02/10] iommu/vt-d: Set IOASID capacity when SVM is enabled Jacob Pan
2020-03-27 8:08 ` Tian, Kevin
2020-03-25 17:55 ` [PATCH 03/10] iommu/ioasid: Introduce per set allocation APIs Jacob Pan
2020-03-26 2:12 ` Lu Baolu
2020-03-26 21:30 ` Jacob Pan
2020-03-27 8:38 ` Tian, Kevin
2020-03-27 16:59 ` Jacob Pan
2020-03-28 6:32 ` Tian, Kevin
2020-04-01 13:47 ` Jean-Philippe Brucker
2020-04-06 20:02 ` Jacob Pan
2020-04-07 11:01 ` Jean-Philippe Brucker
2020-04-21 21:51 ` Jacob Pan
2020-03-25 17:55 ` [PATCH 04/10] iommu/ioasid: Rename ioasid_set_data to avoid confusion with ioasid_set Jacob Pan
2020-03-27 9:35 ` Tian, Kevin
2020-03-25 17:55 ` [PATCH 05/10] iommu/ioasid: Create an IOASID set for host SVA use Jacob Pan
2020-03-27 9:41 ` Tian, Kevin
2020-03-27 17:28 ` Jacob Pan
2020-03-28 6:33 ` Tian, Kevin
2020-04-01 13:53 ` Jean-Philippe Brucker
2020-04-06 15:33 ` Jacob Pan
2020-04-07 11:01 ` Jean-Philippe Brucker
2020-04-13 22:06 ` Jacob Pan
2020-04-15 15:10 ` Jean-Philippe Brucker
2020-03-25 17:55 ` [PATCH 06/10] iommu/ioasid: Convert to set aware allocations Jacob Pan
2020-03-27 9:54 ` Tian, Kevin
2020-03-27 17:41 ` Jacob Pan
2020-03-28 6:40 ` Tian, Kevin
2020-04-06 20:07 ` Jacob Pan
2020-04-01 13:55 ` Jean-Philippe Brucker
2020-04-01 22:45 ` Jacob Pan
2020-03-25 17:55 ` [PATCH 07/10] iommu/ioasid: Use mutex instead of spinlock Jacob Pan
2020-03-27 9:55 ` Tian, Kevin
2020-04-01 13:58 ` Jean-Philippe Brucker
2020-03-25 17:55 ` [PATCH 08/10] iommu/ioasid: Introduce notifier APIs Jacob Pan
2020-03-27 10:03 ` Tian, Kevin
2020-03-27 18:36 ` Jacob Pan
2020-03-28 6:43 ` Tian, Kevin
2020-03-31 15:13 ` Jacob Pan
2020-04-01 14:00 ` Jean-Philippe Brucker
2020-04-10 15:43 ` Jacob Pan
2020-03-25 17:55 ` Jacob Pan [this message]
2020-03-27 10:09 ` [PATCH 09/10] iommu/ioasid: Support ioasid_set quota adjustment Tian, Kevin
2020-03-27 23:30 ` Jacob Pan
2020-03-28 6:44 ` Tian, Kevin
2020-03-25 17:55 ` [PATCH 10/10] iommu/vt-d: Register PASID notifier for status change Jacob Pan
2020-03-27 10:22 ` Tian, Kevin
2020-03-27 23:47 ` Jacob Pan
2020-04-01 14:03 ` [PATCH 00/10] IOASID extensions for guest SVA Jean-Philippe Brucker
2020-04-01 23:38 ` Jacob Pan
2020-04-02 12:26 ` Jean-Philippe Brucker
2020-04-02 16:09 ` Jacob Pan
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