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Date: Fri, 3 May 2019 15:32:09 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: iommu@...ts.linux-foundation.org,
LKML <linux-kernel@...r.kernel.org>,
Joerg Roedel <joro@...tes.org>,
David Woodhouse <dwmw2@...radead.org>,
Eric Auger <eric.auger@...hat.com>,
Alex Williamson <alex.williamson@...hat.com>,
Jean-Philippe Brucker <jean-philippe.brucker@....com>
Cc: "Yi Liu" <yi.l.liu@...el.com>,
"Tian, Kevin" <kevin.tian@...el.com>,
Raj Ashok <ashok.raj@...el.com>,
"Christoph Hellwig" <hch@...radead.org>,
"Lu Baolu" <baolu.lu@...ux.intel.com>,
Andriy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v3 08/16] iommu/vt-d: Replace Intel specific PASID allocator with IOASID
Make use of generic IOASID code to manage PASID allocation,
free, and lookup. Replace Intel specific code.
Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
drivers/iommu/intel-iommu.c | 11 +++++------
drivers/iommu/intel-pasid.c | 36 ------------------------------------
drivers/iommu/intel-svm.c | 37 +++++++++++++++++++++----------------
3 files changed, 26 insertions(+), 58 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index fcc694a..64af526 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5155,7 +5155,7 @@ static void auxiliary_unlink_device(struct dmar_domain *domain,
domain->auxd_refcnt--;
if (!domain->auxd_refcnt && domain->default_pasid > 0)
- intel_pasid_free_id(domain->default_pasid);
+ ioasid_free(domain->default_pasid);
}
static int aux_domain_add_dev(struct dmar_domain *domain,
@@ -5173,10 +5173,9 @@ static int aux_domain_add_dev(struct dmar_domain *domain,
if (domain->default_pasid <= 0) {
int pasid;
- pasid = intel_pasid_alloc_id(domain, PASID_MIN,
- pci_max_pasids(to_pci_dev(dev)),
- GFP_KERNEL);
- if (pasid <= 0) {
+ pasid = ioasid_alloc(NULL, PASID_MIN, pci_max_pasids(to_pci_dev(dev)) - 1,
+ domain);
+ if (pasid == INVALID_IOASID) {
pr_err("Can't allocate default pasid\n");
return -ENODEV;
}
@@ -5212,7 +5211,7 @@ 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)
- intel_pasid_free_id(domain->default_pasid);
+ ioasid_free(domain->default_pasid);
return ret;
}
diff --git a/drivers/iommu/intel-pasid.c b/drivers/iommu/intel-pasid.c
index 95f8f0c..2ce6ac2 100644
--- a/drivers/iommu/intel-pasid.c
+++ b/drivers/iommu/intel-pasid.c
@@ -26,42 +26,6 @@
*/
static DEFINE_SPINLOCK(pasid_lock);
u32 intel_pasid_max_id = PASID_MAX;
-static DEFINE_IDR(pasid_idr);
-
-int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp)
-{
- int ret, min, max;
-
- min = max_t(int, start, PASID_MIN);
- max = min_t(int, end, intel_pasid_max_id);
-
- WARN_ON(in_interrupt());
- idr_preload(gfp);
- spin_lock(&pasid_lock);
- ret = idr_alloc(&pasid_idr, ptr, min, max, GFP_ATOMIC);
- spin_unlock(&pasid_lock);
- idr_preload_end();
-
- return ret;
-}
-
-void intel_pasid_free_id(int pasid)
-{
- spin_lock(&pasid_lock);
- idr_remove(&pasid_idr, pasid);
- spin_unlock(&pasid_lock);
-}
-
-void *intel_pasid_lookup_id(int pasid)
-{
- void *p;
-
- spin_lock(&pasid_lock);
- p = idr_find(&pasid_idr, pasid);
- spin_unlock(&pasid_lock);
-
- return p;
-}
int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int *pasid)
{
diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c
index f5d1e1e..8fff212 100644
--- a/drivers/iommu/intel-svm.c
+++ b/drivers/iommu/intel-svm.c
@@ -25,6 +25,7 @@
#include <linux/dmar.h>
#include <linux/interrupt.h>
#include <linux/mm_types.h>
+#include <linux/ioasid.h>
#include <asm/page.h>
#include "intel-pasid.h"
@@ -334,16 +335,15 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (pasid_max > intel_pasid_max_id)
pasid_max = intel_pasid_max_id;
- /* Do not use PASID 0 in caching mode (virtualised IOMMU) */
- ret = intel_pasid_alloc_id(svm,
- !!cap_caching_mode(iommu->cap),
- pasid_max - 1, GFP_KERNEL);
- if (ret < 0) {
+ /* Do not use PASID 0, reserved for RID to PASID */
+ svm->pasid = ioasid_alloc(NULL, PASID_MIN,
+ pasid_max - 1, svm);
+ if (svm->pasid == INVALID_IOASID) {
kfree(svm);
kfree(sdev);
+ ret = ENOSPC;
goto out;
}
- svm->pasid = ret;
svm->notifier.ops = &intel_mmuops;
svm->mm = mm;
svm->flags = flags;
@@ -353,7 +353,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (mm) {
ret = mmu_notifier_register(&svm->notifier, mm);
if (ret) {
- intel_pasid_free_id(svm->pasid);
+ ioasid_free(svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -369,7 +369,7 @@ int intel_svm_bind_mm(struct device *dev, int *pasid, int flags, struct svm_dev_
if (ret) {
if (mm)
mmu_notifier_unregister(&svm->notifier, mm);
- intel_pasid_free_id(svm->pasid);
+ ioasid_free(svm->pasid);
kfree(svm);
kfree(sdev);
goto out;
@@ -402,7 +402,12 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
if (!iommu)
goto out;
- svm = intel_pasid_lookup_id(pasid);
+ svm = ioasid_find(NULL, pasid, NULL);
+ if (IS_ERR(svm)) {
+ ret = PTR_ERR(svm);
+ goto out;
+ }
+
if (!svm)
goto out;
@@ -424,7 +429,7 @@ int intel_svm_unbind_mm(struct device *dev, int pasid)
kfree_rcu(sdev, rcu);
if (list_empty(&svm->devs)) {
- intel_pasid_free_id(svm->pasid);
+ ioasid_free(svm->pasid);
if (svm->mm)
mmu_notifier_unregister(&svm->notifier, svm->mm);
@@ -459,10 +464,11 @@ int intel_svm_is_pasid_valid(struct device *dev, int pasid)
if (!iommu)
goto out;
- svm = intel_pasid_lookup_id(pasid);
- if (!svm)
+ svm = ioasid_find(NULL, pasid, NULL);
+ if (IS_ERR(svm)) {
+ ret = PTR_ERR(svm);
goto out;
-
+ }
/* init_mm is used in this case */
if (!svm->mm)
ret = 1;
@@ -569,13 +575,12 @@ static irqreturn_t prq_event_thread(int irq, void *d)
if (!svm || svm->pasid != req->pasid) {
rcu_read_lock();
- svm = intel_pasid_lookup_id(req->pasid);
+ svm = ioasid_find(NULL, req->pasid, NULL);
/* It *can't* go away, because the driver is not permitted
* to unbind the mm while any page faults are outstanding.
* So we only need RCU to protect the internal idr code. */
rcu_read_unlock();
-
- if (!svm) {
+ if (IS_ERR(svm) || !svm) {
pr_err("%s: Page request for invalid PASID %d: %08llx %08llx\n",
iommu->name, req->pasid, ((unsigned long long *)req)[0],
((unsigned long long *)req)[1]);
--
2.7.4
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