IOMMU Archive on lore.kernel.org
 help / color / Atom feed
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: "Tian, Kevin" <kevin.tian@intel.com>,
	Raj Ashok <ashok.raj@intel.com>,
	Jonathan Cameron <jic23@kernel.org>
Subject: [PATCH 09/10] iommu/ioasid: Support ioasid_set quota adjustment
Date: Wed, 25 Mar 2020 10:55:30 -0700
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

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  parent reply index

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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1585158931-1825-10-git-send-email-jacob.jun.pan@linux.intel.com \
    --to=jacob.jun.pan@linux.intel.com \
    --cc=alex.williamson@redhat.com \
    --cc=ashok.raj@intel.com \
    --cc=baolu.lu@linux.intel.com \
    --cc=dwmw2@infradead.org \
    --cc=iommu@lists.linux-foundation.org \
    --cc=jean-philippe@linaro.com \
    --cc=jic23@kernel.org \
    --cc=joro@8bytes.org \
    --cc=kevin.tian@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

IOMMU Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-iommu/0 linux-iommu/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-iommu linux-iommu/ https://lore.kernel.org/linux-iommu \
		iommu@lists.linux-foundation.org
	public-inbox-index linux-iommu

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.linux-foundation.lists.iommu


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git