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>
Cc: jon@solid-run.com, linuxarm@huawei.com, steven.price@arm.com,
guohanjun@huawei.com, yangyicong@huawei.com,
Sami.Mujawar@arm.com, robin.murphy@arm.com,
wanghuiqiang@huawei.com
Subject: [PATCH v6 3/9] iommu/dma: Introduce generic helper to retrieve RMR info
Date: Fri, 16 Jul 2021 09:34:36 +0100 [thread overview]
Message-ID: <20210716083442.1708-4-shameerali.kolothum.thodi@huawei.com> (raw)
In-Reply-To: <20210716083442.1708-1-shameerali.kolothum.thodi@huawei.com>
Reserved Memory Regions(RMR) associated with an IOMMU can be
described through ACPI IORT tables in systems with devices
that require a unity mapping or bypass for those
regions.
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 | 29 +++++++++++++++++++++++++++++
include/linux/dma-iommu.h | 13 +++++++++++++
2 files changed, 42 insertions(+)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 98ba927aee1a..2fa2445e9070 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -174,6 +174,35 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
}
EXPORT_SYMBOL(iommu_put_dma_cookie);
+/**
+ *
+ * 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 -EINVAL;
+}
+EXPORT_SYMBOL(iommu_dma_get_rmrs);
+
+/**
+ *
+ * iommu_dma_put_rmrs - Release Reserved Memory Regions(RMRs) associated
+ * with a given IOMMU
+ * @iommu_fwnode: fwnode associated with IOMMU
+ * @list: RMR list
+ *
+ */
+void iommu_dma_put_rmrs(struct fwnode_handle *iommu_fwnode,
+ struct list_head *list)
+{
+}
+EXPORT_SYMBOL(iommu_dma_put_rmrs);
+
/**
* iommu_dma_get_resv_regions - Reserved region driver helper
* @dev: Device from iommu_get_resv_regions()
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index 758ca4694257..3b7b2d096c6e 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -42,12 +42,16 @@ void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
extern bool iommu_dma_forcedac;
+int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+void iommu_dma_put_rmrs(struct fwnode_handle *iommu, struct list_head *list);
+
#else /* CONFIG_IOMMU_DMA */
struct iommu_domain;
struct msi_desc;
struct msi_msg;
struct device;
+struct fwnode_handle;
static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
u64 dma_limit)
@@ -83,5 +87,14 @@ static inline void iommu_dma_get_resv_regions(struct device *dev, struct list_he
{
}
+static int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list)
+{
+ return -ENODEV;
+}
+
+static void iommu_dma_put_rmrs(struct fwnode_handle *iommu, struct list_head *list)
+{
+}
+
#endif /* CONFIG_IOMMU_DMA */
#endif /* __DMA_IOMMU_H */
--
2.17.1
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next prev parent reply other threads:[~2021-07-16 8:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-16 8:34 [PATCH v6 0/9] ACPI/IORT: Support for IORT RMR node Shameer Kolothum
2021-07-16 8:34 ` [PATCH v6 1/9] iommu: Introduce a union to struct iommu_resv_region Shameer Kolothum
2021-07-16 8:34 ` [PATCH v6 2/9] ACPI/IORT: Add support for RMR node parsing Shameer Kolothum
2021-07-16 8:34 ` Shameer Kolothum [this message]
2021-07-16 8:34 ` [PATCH v6 4/9] ACPI/IORT: Add a helper to retrieve RMR memory regions Shameer Kolothum
2021-07-16 8:34 ` [PATCH v6 5/9] iommu/arm-smmu-v3: Introduce strtab init helper Shameer Kolothum
2021-07-16 8:34 ` [PATCH v6 6/9] iommu/arm-smmu-v3: Refactor arm_smmu_init_bypass_stes() to force bypass Shameer Kolothum
2021-07-16 8:34 ` [PATCH v6 7/9] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE Shameer Kolothum
2021-07-16 8:34 ` [PATCH v6 8/9] iommu/arm-smmu: Get associated RMR info and install bypass SMR Shameer Kolothum
2021-07-16 13:52 ` Steven Price
2021-07-16 20:40 ` Jon Nettleton
2021-07-16 8:34 ` [PATCH v6 9/9] iommu/dma: Reserve any RMR regions associated with a dev Shameer Kolothum
2021-07-19 13:45 ` [PATCH v6 0/9] ACPI/IORT: Support for IORT RMR node Laurentiu Tudor
2021-07-27 6:51 ` Shameerali Kolothum Thodi
2021-08-02 9:22 ` joro
2021-07-27 8:32 ` Hanjun Guo
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