Add a small API within the IOMMU subsystem to handle different formats of
PASID tables. It uses the same principle as io-pgtable:
* The IOMMU driver registers a PASID table with some invalidation
callbacks.
* The pasid-table lib allocates a set of tables of the right format, and
returns an iommu_pasid_table_ops structure.
* The IOMMU driver allocates entries and writes them using the provided
ops.
* The pasid-table lib calls the IOMMU driver back for invalidation when
necessary.
* The IOMMU driver unregisters the ops which frees the tables when
finished.
An example user will be Arm SMMU in a subsequent patch.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
---
drivers/iommu/Kconfig | 8 +++
drivers/iommu/Makefile | 1 +
drivers/iommu/iommu-pasid.c | 53 +++++++++++++++++
drivers/iommu/iommu-pasid.h | 142 ++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 204 insertions(+)
create mode 100644 drivers/iommu/iommu-pasid.c
create mode 100644 drivers/iommu/iommu-pasid.h
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index e751bb9958ba..8add90ba9b75 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -60,6 +60,14 @@ config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
endmenu
+menu "Generic PASID table support"
+
+# Selected by the actual PASID table implementations
+config IOMMU_PASID_TABLE
+ bool
+
+endmenu
+
config IOMMU_IOVA
tristate
diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile
index f4324e29035e..338e59c93131 100644
--- a/drivers/iommu/Makefile
+++ b/drivers/iommu/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_IOMMU_FAULT) += io-pgfault.o
obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
obj-$(CONFIG_IOMMU_IO_PGTABLE_ARMV7S) += io-pgtable-arm-v7s.o
obj-$(CONFIG_IOMMU_IO_PGTABLE_LPAE) += io-pgtable-arm.o
+obj-$(CONFIG_IOMMU_PASID_TABLE) += iommu-pasid.o
obj-$(CONFIG_IOMMU_IOVA) += iova.o
obj-$(CONFIG_OF_IOMMU) += of_iommu.o
obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o
diff --git a/drivers/iommu/iommu-pasid.c b/drivers/iommu/iommu-pasid.c
new file mode 100644
index 000000000000..6b21d369d514
--- /dev/null
+++ b/drivers/iommu/iommu-pasid.c
@@ -0,0 +1,53 @@
+/*
+ * PASID table management for the IOMMU
+ *
+ * Copyright (C) 2018 ARM Ltd.
+ * Author: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <linux/kernel.h>
+
+#include "iommu-pasid.h"
+
+static const struct iommu_pasid_init_fns *
+pasid_table_init_fns[PASID_TABLE_NUM_FMTS] = {
+};
+
+struct iommu_pasid_table_ops *
+iommu_alloc_pasid_ops(enum iommu_pasid_table_fmt fmt,
+ struct iommu_pasid_table_cfg *cfg, void *cookie)
+{
+ struct iommu_pasid_table *table;
+ const struct iommu_pasid_init_fns *fns;
+
+ if (fmt >= PASID_TABLE_NUM_FMTS)
+ return NULL;
+
+ fns = pasid_table_init_fns[fmt];
+ if (!fns)
+ return NULL;
+
+ table = fns->alloc(cfg, cookie);
+ if (!table)
+ return NULL;
+
+ table->fmt = fmt;
+ table->cookie = cookie;
+ table->cfg = *cfg;
+
+ return &table->ops;
+}
+
+void iommu_free_pasid_ops(struct iommu_pasid_table_ops *ops)
+{
+ struct iommu_pasid_table *table;
+
+ if (!ops)
+ return;
+
+ table = container_of(ops, struct iommu_pasid_table, ops);
+ iommu_pasid_flush_all(table);
+ pasid_table_init_fns[table->fmt]->free(table);
+}
diff --git a/drivers/iommu/iommu-pasid.h b/drivers/iommu/iommu-pasid.h
new file mode 100644
index 000000000000..40a27d35c1e0
--- /dev/null
+++ b/drivers/iommu/iommu-pasid.h
@@ -0,0 +1,142 @@
+/*
+ * PASID table management for the IOMMU
+ *
+ * Copyright (C) 2017 ARM Ltd.
+ * Author: Jean-Philippe Brucker <jean-philippe.brucker@xxxxxxx>
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+#ifndef __IOMMU_PASID_H
+#define __IOMMU_PASID_H
+
+#include <linux/types.h>
+#include "io-pgtable.h"
+
+struct mm_struct;
+
+enum iommu_pasid_table_fmt {
+ PASID_TABLE_NUM_FMTS,
+};
+
+/**
+ * iommu_pasid_entry - Entry of a PASID table
+ *
+ * @token: architecture-specific data needed to uniquely identify the
+ * entry. Most notably used for TLB invalidation
+ */
+struct iommu_pasid_entry {
+ u64 tag;
+};
+
+/**
+ * iommu_pasid_table_ops - Operations on a PASID table
+ *
+ * @alloc_shared_entry: allocate an entry for sharing an mm (SVA)
+ * Returns the pointer to a new entry or an error
+ * @alloc_priv_entry: allocate an entry for map/unmap operations
+ * Returns the pointer to a new entry or an error
+ * @free_entry: free an entry obtained with alloc_entry
+ * @set_entry: write PASID table entry
+ * @clear_entry: clear PASID table entry
+ */
+struct iommu_pasid_table_ops {
+ struct iommu_pasid_entry *
+ (*alloc_shared_entry)(struct iommu_pasid_table_ops *ops,
+ struct mm_struct *mm);
+ struct iommu_pasid_entry *
+ (*alloc_priv_entry)(struct iommu_pasid_table_ops *ops,
+ enum io_pgtable_fmt fmt,
+ struct io_pgtable_cfg *cfg);
+ void (*free_entry)(struct iommu_pasid_table_ops *ops,
+ struct iommu_pasid_entry *entry);
+ int (*set_entry)(struct iommu_pasid_table_ops *ops, int pasid,
+ struct iommu_pasid_entry *entry);
+ void (*clear_entry)(struct iommu_pasid_table_ops *ops, int pasid,
+ struct iommu_pasid_entry *entry);
+};
+
+/**
+ * iommu_pasid_sync_ops - Callbacks into the IOMMU driver
+ *
+ * @cfg_flush: flush cached configuration for one entry. For a
+ * multi-level PASID table, 'leaf' tells whether to only
+ * flush cached leaf entries or intermediate levels as
+ * well.
+ * @cfg_flush_all: flush cached configuration for all entries of the PASID
+ * table
+ * @tlb_flush: flush TLB entries for one entry
+ */
+struct iommu_pasid_sync_ops {
+ void (*cfg_flush)(void *cookie, int pasid, bool leaf);
+ void (*cfg_flush_all)(void *cookie);
+ void (*tlb_flush)(void *cookie, int pasid,
+ struct iommu_pasid_entry *entry);
+};
+
+/**
+ * struct iommu_pasid_table_cfg - Configuration data for a set of PASID tables.
+ *
+ * @iommu_dev device performing the DMA table walks
+ * @order: number of PASID bits, set by IOMMU driver
+ * @flush: TLB management callbacks for this set of tables.
+ *
+ * @base: DMA address of the allocated table, set by the allocator.
+ */
+struct iommu_pasid_table_cfg {
+ struct device *iommu_dev;
+ size_t order;
+ const struct iommu_pasid_sync_ops *sync;
+
+ dma_addr_t base;
+};
+
+struct iommu_pasid_table_ops *
+iommu_alloc_pasid_ops(enum iommu_pasid_table_fmt fmt,
+ struct iommu_pasid_table_cfg *cfg,
+ void *cookie);
+void iommu_free_pasid_ops(struct iommu_pasid_table_ops *ops);
+
+/**
+ * struct iommu_pasid_table - describes a set of PASID tables
+ *
+ * @fmt: The PASID table format.
+ * @cookie: An opaque token provided by the IOMMU driver and passed back to
+ * any callback routine.
+ * @cfg: A copy of the PASID table configuration.
+ * @ops: The PASID table operations in use for this set of page tables.
+ */
+struct iommu_pasid_table {
+ enum iommu_pasid_table_fmt fmt;
+ void *cookie;
+ struct iommu_pasid_table_cfg cfg;
+ struct iommu_pasid_table_ops ops;
+};
+
+#define iommu_pasid_table_ops_to_table(ops) \
+ container_of((ops), struct iommu_pasid_table, ops)
+
+struct iommu_pasid_init_fns {
+ struct iommu_pasid_table *(*alloc)(struct iommu_pasid_table_cfg *cfg,
+ void *cookie);
+ void (*free)(struct iommu_pasid_table *table);
+};
+
+static inline void iommu_pasid_flush_all(struct iommu_pasid_table *table)
+{
+ table->cfg.sync->cfg_flush_all(table->cookie);
+}
+
+static inline void iommu_pasid_flush(struct iommu_pasid_table *table,
+ int pasid, bool leaf)
+{
+ table->cfg.sync->cfg_flush(table->cookie, pasid, leaf);
+}
+
+static inline void iommu_pasid_flush_tlbs(struct iommu_pasid_table *table,
+ int pasid,
+ struct iommu_pasid_entry *entry)
+{
+ table->cfg.sync->tlb_flush(table->cookie, pasid, entry);
+}
+
+#endif /* __IOMMU_PASID_H */
--
2.15.1
