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From: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
To: <linux-arm-kernel@lists.infradead.org>,
	<linux-acpi@vger.kernel.org>, <iommu@lists.linux-foundation.org>,
	<devel@acpica.org>
Cc: <linuxarm@huawei.com>, <lorenzo.pieralisi@arm.com>,
	<joro@8bytes.org>, <robin.murphy@arm.com>,
	<wanghuiqiang@huawei.com>, <guohanjun@huawei.com>,
	<jonathan.cameron@huawei.com>, <steven.price@arm.com>,
	<Sami.Mujawar@arm.com>
Subject: [RFC PATCH v2 3/8] iommu/dma: Introduce generic helper to retrieve RMR info
Date: Thu, 19 Nov 2020 12:11:45 +0000
Message-ID: <20201119121150.3316-4-shameerali.kolothum.thodi@huawei.com> (raw)
In-Reply-To: <20201119121150.3316-1-shameerali.kolothum.thodi@huawei.com>

Reserved Memory Regions(RMR) associated with an IOMMU may be
described either through ACPI tables or DT in systems with
devices that require a unity mapping or bypass for those
regions in IOMMU drivers.

Introduce a generic interface so that IOMMU drivers can retrieve
and set up necessary mappings.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/dma-iommu.c | 36 ++++++++++++++++++++++++++++++++++++
 include/linux/dma-iommu.h |  7 +++++++
 include/linux/iommu.h     | 16 ++++++++++++++++
 3 files changed, 59 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 0cbcd3fc3e7e..d73768ecdd1a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -166,6 +166,42 @@ void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
 }
 EXPORT_SYMBOL(iommu_dma_get_resv_regions);
 
+/**
+ * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated
+ *                      with a given IOMMU
+ * @iommu_fwnode: fwnode associated with IOMMU
+ * @list: RMR list to be populated
+ *
+ */
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu_fwnode,
+		       struct list_head *list)
+{
+	return 0;
+}
+EXPORT_SYMBOL(iommu_dma_get_rmrs);
+
+struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length,
+				      u32 *ids, int num_ids)
+{
+	struct iommu_rmr *rmr;
+	int i;
+
+	rmr = kzalloc(struct_size(rmr, ids, num_ids), GFP_KERNEL);
+	if (!rmr)
+		return NULL;
+
+	INIT_LIST_HEAD(&rmr->list);
+	rmr->base_address = base;
+	rmr->length = length;
+	rmr->num_ids = num_ids;
+
+	for (i = 0; i < num_ids; i++)
+		rmr->ids[i] = ids[i];
+
+	return rmr;
+}
+EXPORT_SYMBOL(iommu_dma_alloc_rmr);
+
 static int cookie_init_hw_msi_region(struct iommu_dma_cookie *cookie,
 		phys_addr_t start, phys_addr_t end)
 {
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 2112f21f73d8..8900ccbc9e6a 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -37,6 +37,9 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc,
 
 void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
 
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length,
+				      u32 *ids, int num_ids);
 #else /* CONFIG_IOMMU_DMA */
 
 struct iommu_domain;
@@ -78,5 +81,9 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he
 {
 }
 
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+{
+	return 0;
+}
 #endif	/* CONFIG_IOMMU_DMA */
 #endif	/* __DMA_IOMMU_H */
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index b95a6f8db6ff..e43c4e8084e7 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -592,6 +592,22 @@ struct iommu_sva {
 	struct device			*dev;
 };
 
+/**
+ * struct iommu_rmr - Reserved Memory Region details per IOMMU
+ * @list: Linked list pointers to hold RMR region info
+ * @base_address: base address of Reserved Memory Region
+ * @length: length of memory region
+ * @num_ids: number of associated device IDs
+ * @ids: associated device IDs
+ */
+struct iommu_rmr {
+	struct list_head	list;
+	phys_addr_t		base_address;
+	u64			length;
+	unsigned int		num_ids;
+	u32			ids[];
+};
+
 int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode,
 		      const struct iommu_ops *ops);
 void iommu_fwspec_free(struct device *dev);
-- 
2.17.1


  parent reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 12:11 [RFC PATCH v2 0/8] ACPI/IORT: Support for IORT RMR node Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 1/8] ACPICA: IORT: Update for revision E Shameer Kolothum
2021-03-22 10:36   ` Shameerali Kolothum Thodi
2021-03-22 21:57     ` Kaneda, Erik
2021-03-23 15:53       ` Lorenzo Pieralisi
2021-03-23 18:51         ` Kaneda, Erik
2021-03-24  9:50           ` Lorenzo Pieralisi
2021-03-25  8:40     ` Jon Nettleton
2021-03-25 15:54       ` Shameerali Kolothum Thodi
2021-04-15  7:27   ` Auger Eric
2020-11-19 12:11 ` [RFC PATCH v2 2/8] ACPI/IORT: Add support for RMR node parsing Shameer Kolothum
2021-04-15  9:39   ` Auger Eric
2021-04-15 10:30     ` Shameerali Kolothum Thodi
2020-11-19 12:11 ` Shameer Kolothum [this message]
2020-11-19 12:11 ` [RFC PATCH v2 4/8] ACPI/IORT: Add RMR memory regions reservation helper Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 5/8] iommu/arm-smmu-v3: Introduce strtab init helper Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 6/8] iommu/arm-smmu-v3: Add bypass flag to arm_smmu_write_strtab_ent() Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 7/8] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE Shameer Kolothum
2020-11-19 12:11 ` [RFC PATCH v2 8/8] iommu/arm-smmu-v3: Reserve any RMR regions associated with a dev Shameer Kolothum
2020-12-10 10:25 ` [RFC PATCH v2 0/8] ACPI/IORT: Support for IORT RMR node Steven Price
2020-12-14 10:55   ` Shameerali Kolothum Thodi
2020-12-14 12:33     ` Robin Murphy
2020-12-14 13:42       ` Steven Price
2020-12-14 14:47         ` Shameerali Kolothum Thodi
2020-12-17 14:47           ` Jon Nettleton
2020-12-17 15:42             ` Shameerali Kolothum Thodi
2020-12-17 15:53               ` Jon Nettleton
2020-12-18 10:53                 ` Jon Nettleton
2021-01-04  8:55                   ` Shameerali Kolothum Thodi
2021-01-04 10:55                     ` Jon Nettleton
2021-04-09  9:50 ` Auger Eric
2021-04-09 10:08   ` Shameerali Kolothum Thodi
2021-04-15  9:48 ` Auger Eric
2021-04-15 10:37   ` Shameerali Kolothum Thodi

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