From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: LKML <linux-kernel@vger.kernel.org>,
iommu@lists.linux.dev, Jason Gunthorpe <jgg@nvidia.com>,
"Lu Baolu" <baolu.lu@linux.intel.com>,
Joerg Roedel <joro@8bytes.org>,
Jean-Philippe Brucker <jean-philippe@linaro.com>,
Dave Hansen <dave.hansen@intel.com>,
Thomas Gleixner <tglx@linutronix.de>, X86 Kernel <x86@kernel.org>,
bp@alien8.de, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
corbet@lwn.net, vkoul@kernel.org, dmaengine@vger.kernel.org,
linux-doc@vger.kernel.org
Cc: "Robin Murphy" <robin.murphy@arm.com>,
"Will Deacon" <will@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
Raj Ashok <ashok.raj@intel.com>,
"Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
"Yu, Fenghua" <fenghua.yu@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>,
Tony Luck <tony.luck@intel.com>,
Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: [PATCH v5 2/7] iommu/sva: Move PASID helpers to sva code
Date: Thu, 9 Mar 2023 14:21:54 -0800 [thread overview]
Message-ID: <20230309222159.487826-4-jacob.jun.pan@linux.intel.com> (raw)
In-Reply-To: <20230309222159.487826-1-jacob.jun.pan@linux.intel.com>
Preparing to remove IOASID infrastructure, PASID management will be
under SVA code. Decouple mm code from IOASID. Use iommu-help.h instead
of iommu.h to prevent circular inclusion.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
v5:
- move definition of helpers to iommu code to be consistent with
declarations. (Kevin)
- fix patch partitioning bug (Baolu)
v4:
- delete and open code mm_set_pasid
- keep mm_init_pasid() as inline for fork performance
---
drivers/iommu/iommu-sva.c | 10 +++++++++-
include/linux/ioasid.h | 2 +-
include/linux/iommu-helper.h | 12 ++++++++++++
include/linux/sched/mm.h | 27 +--------------------------
4 files changed, 23 insertions(+), 28 deletions(-)
diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index 24bf9b2b58aa..fcfdc80a3939 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -44,7 +44,7 @@ int iommu_sva_alloc_pasid(struct mm_struct *mm, ioasid_t min, ioasid_t max)
if (!pasid_valid(pasid))
ret = -ENOMEM;
else
- mm_pasid_set(mm, pasid);
+ mm->pasid = pasid;
out:
mutex_unlock(&iommu_sva_lock);
return ret;
@@ -238,3 +238,11 @@ iommu_sva_handle_iopf(struct iommu_fault *fault, void *data)
return status;
}
+
+void mm_pasid_drop(struct mm_struct *mm)
+{
+ if (pasid_valid(mm->pasid)) {
+ ioasid_free(mm->pasid);
+ mm->pasid = INVALID_IOASID;
+ }
+}
diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
index af1c9d62e642..2c502e77ee78 100644
--- a/include/linux/ioasid.h
+++ b/include/linux/ioasid.h
@@ -4,8 +4,8 @@
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/iommu-helper.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);
diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index 74be34f3a20a..be1451a05a15 100644
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -6,6 +6,7 @@
#include <linux/log2.h>
#include <linux/math.h>
#include <linux/types.h>
+#include <linux/mm_types.h>
static inline unsigned long iommu_device_max_index(unsigned long size,
unsigned long offset,
@@ -41,4 +42,15 @@ static inline unsigned long iommu_num_pages(unsigned long addr,
return DIV_ROUND_UP(size, io_page_size);
}
+#define INVALID_IOASID (-1U)
+#ifdef CONFIG_IOMMU_SVA
+static inline void mm_pasid_init(struct mm_struct *mm)
+{
+ mm->pasid = INVALID_IOASID;
+}
+void mm_pasid_drop(struct mm_struct *mm);
+#else
+static inline void mm_pasid_init(struct mm_struct *mm) {}
+static inline void mm_pasid_drop(struct mm_struct *mm) {}
+#endif
#endif
diff --git a/include/linux/sched/mm.h b/include/linux/sched/mm.h
index 2a243616f222..f341a7a855e8 100644
--- a/include/linux/sched/mm.h
+++ b/include/linux/sched/mm.h
@@ -8,7 +8,7 @@
#include <linux/mm_types.h>
#include <linux/gfp.h>
#include <linux/sync_core.h>
-#include <linux/ioasid.h>
+#include <linux/iommu-helper.h>
/*
* Routines for handling mm_structs
@@ -451,29 +451,4 @@ static inline void membarrier_update_current_mm(struct mm_struct *next_mm)
}
#endif
-#ifdef CONFIG_IOMMU_SVA
-static inline void mm_pasid_init(struct mm_struct *mm)
-{
- mm->pasid = INVALID_IOASID;
-}
-
-/* Associate a PASID with an mm_struct: */
-static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid)
-{
- mm->pasid = pasid;
-}
-
-static inline void mm_pasid_drop(struct mm_struct *mm)
-{
- if (pasid_valid(mm->pasid)) {
- ioasid_free(mm->pasid);
- mm->pasid = INVALID_IOASID;
- }
-}
-#else
-static inline void mm_pasid_init(struct mm_struct *mm) {}
-static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid) {}
-static inline void mm_pasid_drop(struct mm_struct *mm) {}
-#endif
-
#endif /* _LINUX_SCHED_MM_H */
--
2.25.1
next prev parent reply other threads:[~2023-03-09 22:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-09 22:21 [PATCH v5 0/7] Remove VT-d virtual command interface and IOASID Jacob Pan
2023-03-09 22:21 ` Jacob Pan
2023-03-09 22:21 ` [PATCH v5 1/7] iommu/vt-d: Remove virtual command interface Jacob Pan
2023-03-09 22:21 ` Jacob Pan [this message]
2023-03-10 1:43 ` [PATCH v5 2/7] iommu/sva: Move PASID helpers to sva code Jason Gunthorpe
2023-03-10 19:23 ` Jacob Pan
2023-03-10 20:00 ` Robin Murphy
2023-03-10 21:36 ` Jacob Pan
2023-03-09 22:21 ` [PATCH v5 3/7] iommu/sva: Remove PASID to mm lookup function Jacob Pan
2023-03-10 3:44 ` Baolu Lu
2023-03-09 22:21 ` [PATCH v5 4/7] iommu/sva: Stop using ioasid_set for SVA Jacob Pan
2023-03-10 5:07 ` Baolu Lu
2023-03-10 17:52 ` Jacob Pan
2023-03-09 22:21 ` [PATCH v5 5/7] iommu/sva: Use GFP_KERNEL for pasid allocation Jacob Pan
2023-03-09 22:21 ` [PATCH v5 6/7] iommu/ioasid: Rename INVALID_IOASID Jacob Pan
2023-03-09 22:21 ` [PATCH v5 7/7] iommu: Remove ioasid infrastructure Jacob Pan
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