[PATCH v3 05/14] iommu/ioasid: Redefine IOASID set and allocation APIs

From: Jacob Pan
Date: Mon Sep 28 2020 - 17:37:27 EST

ioasid_set was introduced as an arbitrary token that is shared by a
group of IOASIDs. For example, two IOASIDs allocated via the same
ioasid_set pointer belong to the same set.

For guest SVA usages, system-wide IOASID resources need to be
partitioned such that each VM can have its own quota and being managed
separately. ioasid_set is the perfect candidate for meeting such
requirements. This patch redefines and extends ioasid_set with the
following new fields:
- Quota
- Reference count
- Storage of its namespace
- The token is now stored in the ioasid_set with types

Basic ioasid_set level APIs are introduced that wire up these new data.
Existing users of IOASID APIs are converted where a host IOASID set is
allocated for bare-metal usage.

Signed-off-by: Liu Yi L <yi.l.liu@xxxxxxxxx>
Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
---
drivers/iommu/intel/iommu.c | 26 +++--
drivers/iommu/intel/pasid.h | 1 +
drivers/iommu/intel/svm.c | 25 ++--
drivers/iommu/ioasid.c | 277 ++++++++++++++++++++++++++++++++++++++++----
include/linux/ioasid.h | 53 +++++++--
5 files changed, 333 insertions(+), 49 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index e7bcb299e51e..872391890323 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -104,6 +104,9 @@
*/
#define INTEL_IOMMU_PGSIZES (~0xFFFUL)

+/* PASIDs used by host SVM */
+struct ioasid_set *host_pasid_set;
+
static inline int agaw_to_level(int agaw)
{
return agaw + 2;
@@ -3147,8 +3150,8 @@ static void intel_vcmd_ioasid_free(ioasid_t ioasid, void *data)
* Sanity check the ioasid owner is done at upper layer, e.g. VFIO
* We can only free the PASID when all the devices are unbound.
*/
- if (ioasid_find(NULL, ioasid, NULL)) {
- pr_alert("Cannot free active IOASID %d\n", ioasid);
+ if (IS_ERR(ioasid_find(host_pasid_set, ioasid, NULL))) {
+ pr_err("IOASID %d to be freed but not in system set\n", ioasid);
return;
}
vcmd_free_pasid(iommu, ioasid);
@@ -3333,8 +3336,17 @@ static int __init init_dmars(void)
goto free_iommu;

/* PASID is needed for scalable mode irrespective to SVM */
- if (intel_iommu_sm)
+ if (intel_iommu_sm) {
ioasid_install_capacity(intel_pasid_max_id);
+ /* We should not run out of IOASIDs at boot */
+ host_pasid_set = ioasid_set_alloc(NULL, PID_MAX_DEFAULT,
+ IOASID_SET_TYPE_NULL);
+ if (IS_ERR_OR_NULL(host_pasid_set)) {
+ pr_err("Failed to allocate host PASID set %lu\n",
+ PTR_ERR(host_pasid_set));
+ intel_iommu_sm = 0;
+ }
+ }

/*
* for each drhd
@@ -3381,7 +3393,7 @@ static int __init init_dmars(void)
disable_dmar_iommu(iommu);
free_dmar_iommu(iommu);
}
-
+ ioasid_set_put(host_pasid_set);
kfree(g_iommus);

error:
@@ -5163,7 +5175,7 @@ static void auxiliary_unlink_device(struct dmar_domain *domain,
domain->auxd_refcnt--;

if (!domain->auxd_refcnt && domain->default_pasid > 0)
- ioasid_free(domain->default_pasid);
+ ioasid_free(host_pasid_set, domain->default_pasid);
}

static int aux_domain_add_dev(struct dmar_domain *domain,
@@ -5181,7 +5193,7 @@ static int aux_domain_add_dev(struct dmar_domain *domain,
int pasid;

/* No private data needed for the default pasid */
- pasid = ioasid_alloc(NULL, PASID_MIN,
+ pasid = ioasid_alloc(host_pasid_set, PASID_MIN,
pci_max_pasids(to_pci_dev(dev)) - 1,
NULL);
if (pasid == INVALID_IOASID) {
@@ -5224,7 +5236,7 @@ static int aux_domain_add_dev(struct dmar_domain *domain,
spin_unlock(&iommu->lock);
spin_unlock_irqrestore(&device_domain_lock, flags);
if (!domain->auxd_refcnt && domain->default_pasid > 0)
- ioasid_free(domain->default_pasid);
+ ioasid_free(host_pasid_set, domain->default_pasid);

return ret;
}
diff --git a/drivers/iommu/intel/pasid.h b/drivers/iommu/intel/pasid.h
index c9850766c3a9..ccdc23446015 100644
--- a/drivers/iommu/intel/pasid.h
+++ b/drivers/iommu/intel/pasid.h
@@ -99,6 +99,7 @@ static inline bool pasid_pte_is_present(struct pasid_entry *pte)
}

extern u32 intel_pasid_max_id;
+extern struct ioasid_set *host_pasid_set;
int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp);
void intel_pasid_free_id(int pasid);
void *intel_pasid_lookup_id(int pasid);
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 06a16bee7b65..2e764e283469 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -228,7 +228,9 @@ static LIST_HEAD(global_svm_list);
list_for_each_entry((sdev), &(svm)->devs, list) \
if ((d) != (sdev)->dev) {} else

-static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
+static int pasid_to_svm_sdev(struct device *dev,
+ struct ioasid_set *set,
+ unsigned int pasid,
struct intel_svm **rsvm,
struct intel_svm_dev **rsdev)
{
@@ -242,7 +244,7 @@ static int pasid_to_svm_sdev(struct device *dev, unsigned int pasid,
if (pasid == INVALID_IOASID || pasid >= PASID_MAX)
return -EINVAL;

- svm = ioasid_find(NULL, pasid, NULL);
+ svm = ioasid_find(set, pasid, NULL);
if (IS_ERR(svm))
return PTR_ERR(svm);

@@ -312,7 +314,8 @@ int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
dmar_domain = to_dmar_domain(domain);

mutex_lock(&pasid_mutex);
- ret = pasid_to_svm_sdev(dev, data->hpasid, &svm, &sdev);
+ ret = pasid_to_svm_sdev(dev, NULL,
+ data->hpasid, &svm, &sdev);
if (ret)
goto out;

@@ -417,7 +420,7 @@ int intel_svm_unbind_gpasid(struct device *dev, int pasid)
return -EINVAL;

mutex_lock(&pasid_mutex);
- ret = pasid_to_svm_sdev(dev, pasid, &svm, &sdev);
+ ret = pasid_to_svm_sdev(dev, NULL, pasid, &svm, &sdev);
if (ret)
goto out;

@@ -555,7 +558,7 @@ intel_svm_bind_mm(struct device *dev, int flags, struct svm_dev_ops *ops,
pasid_max = intel_pasid_max_id;

/* Do not use PASID 0, reserved for RID to PASID */
- svm->pasid = ioasid_alloc(NULL, PASID_MIN,
+ svm->pasid = ioasid_alloc(host_pasid_set, PASID_MIN,
pasid_max - 1, svm);
if (svm->pasid == INVALID_IOASID) {
kfree(svm);
@@ -572,7 +575,7 @@ intel_svm_bind_mm(struct device *dev, int flags, struct svm_dev_ops *ops,
if (mm) {
ret = mmu_notifier_register(&svm->notifier, mm);
if (ret) {
- ioasid_free(svm->pasid);
+ ioasid_free(host_pasid_set, svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -590,7 +593,7 @@ intel_svm_bind_mm(struct device *dev, int flags, struct svm_dev_ops *ops,
if (ret) {
if (mm)
mmu_notifier_unregister(&svm->notifier, mm);
- ioasid_free(svm->pasid);
+ ioasid_free(host_pasid_set, svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -638,7 +641,8 @@ static int intel_svm_unbind_mm(struct device *dev, int pasid)
if (!iommu)
goto out;

- ret = pasid_to_svm_sdev(dev, pasid, &svm, &sdev);
+ ret = pasid_to_svm_sdev(dev, host_pasid_set,
+ pasid, &svm, &sdev);
if (ret)
goto out;

@@ -659,7 +663,7 @@ static int intel_svm_unbind_mm(struct device *dev, int pasid)
kfree_rcu(sdev, rcu);

if (list_empty(&svm->devs)) {
- ioasid_free(svm->pasid);
+ ioasid_free(host_pasid_set, svm->pasid);
if (svm->mm)
mmu_notifier_unregister(&svm->notifier, svm->mm);
list_del(&svm->list);
@@ -1130,7 +1134,8 @@ int intel_svm_page_response(struct device *dev,
goto out;
}

- ret = pasid_to_svm_sdev(dev, prm->pasid, &svm, &sdev);
+ ret = pasid_to_svm_sdev(dev, host_pasid_set,
+ prm->pasid, &svm, &sdev);
if (ret || !sdev) {
ret = -ENODEV;
goto out;
diff --git a/drivers/iommu/ioasid.c b/drivers/iommu/ioasid.c
index 4277cb17e15b..61e25c2375ab 100644
--- a/drivers/iommu/ioasid.c
+++ b/drivers/iommu/ioasid.c
@@ -1,8 +1,8 @@
// SPDX-License-Identifier: GPL-2.0
/*
* I/O Address Space ID allocator. There is one global IOASID space, split into
- * subsets. Users create a subset with DECLARE_IOASID_SET, then allocate and
- * free IOASIDs with ioasid_alloc and ioasid_free.
+ * sets. Users create a set with ioasid_set_alloc, then allocate/free IDs
+ * with ioasid_alloc and ioasid_free.
*/
#include <linux/ioasid.h>
#include <linux/module.h>
@@ -14,6 +14,8 @@
#define PCI_PASID_MAX 0x100000
static ioasid_t ioasid_capacity = PCI_PASID_MAX;
static ioasid_t ioasid_capacity_avail = PCI_PASID_MAX;
+static DEFINE_XARRAY_ALLOC(ioasid_sets);
+
struct ioasid_data {
ioasid_t id;
struct ioasid_set *set;
@@ -343,6 +345,114 @@ void ioasid_detach_data(ioasid_t ioasid)
}
EXPORT_SYMBOL_GPL(ioasid_detach_data);

+static inline bool ioasid_set_is_valid(struct ioasid_set *set)
+{
+ return xa_load(&ioasid_sets, set->id) == set;
+}
+
+/**
+ * ioasid_set_alloc - Allocate a new IOASID set for a given token
+ *
+ * @token: An optional arbitrary number that can be associated with the
+ * IOASID set. @token can be NULL if the type is
+ * IOASID_SET_TYPE_NULL
+ * @quota: Quota allowed in this set
+ * @type: The type of the token used to create the IOASID set
+ *
+ * IOASID is limited system-wide resource that requires quota management.
+ * Token will be stored in the ioasid_set returned. A reference will be taken
+ * on the newly created set. Subsequent IOASID allocation within the set need
+ * to use the retured ioasid_set pointer.
+ */
+struct ioasid_set *ioasid_set_alloc(void *token, ioasid_t quota, int type)
+{
+ struct ioasid_set *set;
+ unsigned long index;
+ ioasid_t id;
+
+ if (type >= IOASID_SET_TYPE_NR)
+ return ERR_PTR(-EINVAL);
+
+ /* REVISIT: may support set w/o quota, use system available */
+ if (!quota)
+ return ERR_PTR(-EINVAL);
+
+ /*
+ * Need to check space available if we share system-wide quota.
+ * TODO: we may need to support quota free sets in the future.
+ */
+ spin_lock(&ioasid_allocator_lock);
+ if (quota > ioasid_capacity_avail) {
+ pr_warn("Out of IOASID capacity! ask %d, avail %d\n",
+ quota, ioasid_capacity_avail);
+ set = ERR_PTR(-ENOSPC);
+ goto exit_unlock;
+ }
+
+ /*
+ * Token is only unique within its types but right now we have only
+ * mm type. If we have more token types, we have to match type as well.
+ */
+ switch (type) {
+ case IOASID_SET_TYPE_MM:
+ if (!token) {
+ set = ERR_PTR(-EINVAL);
+ goto exit_unlock;
+ }
+ /* Search existing set tokens, reject duplicates */
+ xa_for_each(&ioasid_sets, index, set) {
+ if (set->token == token &&
+ set->type == IOASID_SET_TYPE_MM) {
+ set = ERR_PTR(-EEXIST);
+ goto exit_unlock;
+ }
+ }
+ break;
+ case IOASID_SET_TYPE_NULL:
+ if (!token)
+ break;
+ fallthrough;
+ default:
+ pr_err("Invalid token and IOASID type\n");
+ set = ERR_PTR(-EINVAL);
+ goto exit_unlock;
+ }
+
+ set = kzalloc(sizeof(*set), GFP_ATOMIC);
+ if (!set) {
+ set = ERR_PTR(-ENOMEM);
+ goto exit_unlock;
+ }
+
+ if (xa_alloc(&ioasid_sets, &id, set,
+ XA_LIMIT(0, ioasid_capacity_avail - quota),
+ GFP_ATOMIC)) {
+ kfree(set);
+ set = ERR_PTR(-ENOSPC);
+ goto exit_unlock;
+ }
+
+ set->token = token;
+ set->type = type;
+ set->quota = quota;
+ set->id = id;
+ refcount_set(&set->ref, 1);
+
+ /*
+ * Per set XA is used to store private IDs within the set, get ready
+ * for ioasid_set private ID and system-wide IOASID allocation
+ * results.
+ */
+ xa_init(&set->xa);
+ ioasid_capacity_avail -= quota;
+
+exit_unlock:
+ spin_unlock(&ioasid_allocator_lock);
+
+ return set;
+}
+EXPORT_SYMBOL_GPL(ioasid_set_alloc);
+
/**
* ioasid_alloc - Allocate an IOASID
* @set: the IOASID set
@@ -360,11 +470,22 @@ ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max,
{
struct ioasid_data *data;
void *adata;
- ioasid_t id;
+ ioasid_t id = INVALID_IOASID;
+
+ spin_lock(&ioasid_allocator_lock);
+ /* Check if the IOASID set has been allocated and initialized */
+ if (WARN_ON(!ioasid_set_is_valid(set)))
+ goto done_unlock;
+
+ if (set->quota <= set->nr_ioasids) {
+ pr_err_ratelimited("IOASID set out of quota %d\n",
+ set->quota);
+ goto done_unlock;
+ }

data = kzalloc(sizeof(*data), GFP_ATOMIC);
if (!data)
- return INVALID_IOASID;
+ goto done_unlock;

data->set = set;
data->private = private;
@@ -373,11 +494,10 @@ ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max,
* Custom allocator needs allocator data to perform platform specific
* operations.
*/
- spin_lock(&ioasid_allocator_lock);
adata = active_allocator->flags & IOASID_ALLOCATOR_CUSTOM ? active_allocator->ops->pdata : data;
id = active_allocator->ops->alloc(min, max, adata);
if (id == INVALID_IOASID) {
- pr_err("Failed ASID allocation %lu\n", active_allocator->flags);
+ pr_err_ratelimited("Failed IOASID allocation %lu\n", active_allocator->flags);
goto exit_free;
}

@@ -386,46 +506,153 @@ ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max,
/* Custom allocator needs framework to store and track allocation results */
pr_err("Failed to alloc ioasid from %d\n", id);
active_allocator->ops->free(id, active_allocator->ops->pdata);
+ if (active_allocator->flags & IOASID_ALLOCATOR_CUSTOM)
+ xa_erase(&active_allocator->xa, id);
goto exit_free;
}
data->id = id;

- spin_unlock(&ioasid_allocator_lock);
- return id;
+ /* Store IOASID in the per set data */
+ if (xa_err(xa_store(&set->xa, id, data, GFP_ATOMIC))) {
+ pr_err_ratelimited("Failed to store ioasid %d in set\n", id);
+ active_allocator->ops->free(id, active_allocator->ops->pdata);
+ goto exit_free;
+ }
+ set->nr_ioasids++;
+ goto done_unlock;
exit_free:
- spin_unlock(&ioasid_allocator_lock);
kfree(data);
- return INVALID_IOASID;
+done_unlock:
+ spin_unlock(&ioasid_allocator_lock);
+ return id;
}
EXPORT_SYMBOL_GPL(ioasid_alloc);

-/**
- * ioasid_free - Free an IOASID
- * @ioasid: the ID to remove
- */
-void ioasid_free(ioasid_t ioasid)
+static void ioasid_do_free_locked(struct ioasid_data *data)
{
struct ioasid_data *ioasid_data;

- spin_lock(&ioasid_allocator_lock);
- ioasid_data = xa_load(&active_allocator->xa, ioasid);
- if (!ioasid_data) {
- pr_err("Trying to free unknown IOASID %u\n", ioasid);
- goto exit_unlock;
- }
-
- active_allocator->ops->free(ioasid, active_allocator->ops->pdata);
+ active_allocator->ops->free(data->id, active_allocator->ops->pdata);
/* Custom allocator needs additional steps to free the xa element */
if (active_allocator->flags & IOASID_ALLOCATOR_CUSTOM) {
- ioasid_data = xa_erase(&active_allocator->xa, ioasid);
+ ioasid_data = xa_erase(&active_allocator->xa, data->id);
kfree_rcu(ioasid_data, rcu);
}

-exit_unlock:
+ data->set->nr_ioasids--;
+ xa_erase(&data->set->xa, data->id);
+}
+
+static void ioasid_free_locked(struct ioasid_set *set, ioasid_t ioasid)
+{
+ struct ioasid_data *data;
+
+ data = xa_load(&active_allocator->xa, ioasid);
+ if (!data) {
+ pr_err("Trying to free unknown IOASID %u\n", ioasid);
+ return;
+ }
+ if (data->set != set) {
+ pr_warn("Cannot free IOASID %u due to set ownership\n", ioasid);
+ return;
+ }
+ /* Check if the set exists */
+ if (WARN_ON(!xa_load(&ioasid_sets, data->set->id)))
+ return;
+
+ ioasid_do_free_locked(data);
+}
+
+/**
+ * ioasid_free - Drop reference on an IOASID. Free if refcount drops to 0,
+ * including free from its set and system-wide list.
+ * @set: The ioasid_set to check permission with. If not NULL, IOASID
+ * free will fail if the set does not match.
+ * @ioasid: The IOASID to remove
+ */
+void ioasid_free(struct ioasid_set *set, ioasid_t ioasid)
+{
+ spin_lock(&ioasid_allocator_lock);
+ ioasid_free_locked(set, ioasid);
spin_unlock(&ioasid_allocator_lock);
}
EXPORT_SYMBOL_GPL(ioasid_free);

+static void ioasid_set_get_locked(struct ioasid_set *set)
+{
+ if (WARN_ON(!ioasid_set_is_valid(set)))
+ return;
+
+ refcount_inc(&set->ref);
+}
+
+void ioasid_set_get(struct ioasid_set *set)
+{
+ spin_lock(&ioasid_allocator_lock);
+ ioasid_set_get_locked(set);
+ spin_unlock(&ioasid_allocator_lock);
+}
+EXPORT_SYMBOL_GPL(ioasid_set_get);
+
+static void ioasid_set_put_locked(struct ioasid_set *set)
+{
+ struct ioasid_data *entry;
+ unsigned long index;
+
+ if (WARN_ON(!ioasid_set_is_valid(set)))
+ return;
+
+ if (!refcount_dec_and_test(&set->ref))
+ return;
+
+ /* The set is already empty, we just destroy the set. */
+ if (xa_empty(&set->xa))
+ goto done_destroy;
+
+ /*
+ * Free all PASIDs from system-wide IOASID pool, all subscribers gets
+ * notified and do cleanup of their own.
+ * Note that some references of the IOASIDs within the set can still
+ * be held after the free call. This is OK in that the IOASIDs will be
+ * marked inactive, the only operations can be done is ioasid_put.
+ * No need to track IOASID set states since there is no reclaim phase.
+ */
+ xa_for_each(&set->xa, index, entry) {
+ ioasid_free_locked(set, index);
+ /* Free from per set private pool */
+ xa_erase(&set->xa, index);
+ }
+
+done_destroy:
+ /* Return the quota back to system pool */
+ ioasid_capacity_avail += set->quota;
+
+ /*
+ * Token got released right away after the ioasid_set is freed.
+ * If a new set is created immediately with the newly released token,
+ * it will not allocate the same IOASIDs unless they are reclaimed.
+ */
+ xa_erase(&ioasid_sets, set->id);
+ kfree_rcu(set, rcu);
+}
+
+/**
+ * ioasid_set_put - Drop a reference to the IOASID set. Free all IOASIDs within
+ * the set if there are no more users.
+ *
+ * @set: The IOASID set ID to be freed
+ *
+ * If refcount drops to zero, all IOASIDs allocated within the set will be
+ * freed.
+ */
+void ioasid_set_put(struct ioasid_set *set)
+{
+ spin_lock(&ioasid_allocator_lock);
+ ioasid_set_put_locked(set);
+ spin_unlock(&ioasid_allocator_lock);
+}
+EXPORT_SYMBOL_GPL(ioasid_set_put);
+
/**
* ioasid_find - Find IOASID data
* @set: the IOASID set
diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
index 7fc320656be2..1ae213b660f0 100644
--- a/include/linux/ioasid.h
+++ b/include/linux/ioasid.h
@@ -4,14 +4,43 @@

#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/xarray.h>
+#include <linux/refcount.h>

#define INVALID_IOASID ((ioasid_t)-1)
typedef unsigned int ioasid_t;
typedef ioasid_t (*ioasid_alloc_fn_t)(ioasid_t min, ioasid_t max, void *data);
typedef void (*ioasid_free_fn_t)(ioasid_t ioasid, void *data);

+/* IOASID set types */
+enum ioasid_set_type {
+ IOASID_SET_TYPE_NULL = 1, /* Set token is NULL */
+ IOASID_SET_TYPE_MM, /* Set token is a mm_struct pointer
+ * i.e. associated with a process
+ */
+ IOASID_SET_TYPE_NR,
+};
+
+/**
+ * struct ioasid_set - Meta data about ioasid_set
+ * @xa: XArray to store ioasid_set private IDs, can be used for
+ * guest-host IOASID mapping, or just a private IOASID namespace.
+ * @token: Unique to identify an IOASID set
+ * @type: Token types
+ * @quota: Max number of IOASIDs can be allocated within the set
+ * @nr_ioasids: Number of IOASIDs currently allocated in the set
+ * @id: ID of the set
+ * @ref: Reference count of the users
+ */
struct ioasid_set {
- int dummy;
+ struct xarray xa;
+ void *token;
+ int type;
+ int quota;
+ int nr_ioasids;
+ int id;
+ refcount_t ref;
+ struct rcu_head rcu;
};

/**
@@ -29,14 +58,16 @@ struct ioasid_allocator_ops {
void *pdata;
};

-#define DECLARE_IOASID_SET(name) struct ioasid_set name = { 0 }
-
#if IS_ENABLED(CONFIG_IOASID)
void ioasid_install_capacity(ioasid_t total);
ioasid_t ioasid_get_capacity(void);
+struct ioasid_set *ioasid_set_alloc(void *token, ioasid_t quota, int type);
+void ioasid_set_get(struct ioasid_set *set);
+void ioasid_set_put(struct ioasid_set *set);
+
ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min, ioasid_t max,
void *private);
-void ioasid_free(ioasid_t ioasid);
+void ioasid_free(struct ioasid_set *set, ioasid_t ioasid);
void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
bool (*getter)(void *));
int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
@@ -59,12 +90,20 @@ static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
return INVALID_IOASID;
}

-static inline void ioasid_free(ioasid_t ioasid)
+static inline void ioasid_free(struct ioasid_set *set, ioasid_t ioasid)
+{
+}
+
+static inline struct ioasid_set *ioasid_set_alloc(void *token, ioasid_t quota, int type)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
+
+static inline void ioasid_set_put(struct ioasid_set *set)
{
}

-static inline void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
- bool (*getter)(void *))
+static inline void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid, bool (*getter)(void *))
{
return NULL;
}
--
2.7.4