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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>
Cc: <linuxarm@huawei.com>, <lorenzo.pieralisi@arm.com>,
	<joro@8bytes.org>, <robin.murphy@arm.com>,
	<wanghuiqiang@huawei.com>, <guohanjun@huawei.com>,
	<steven.price@arm.com>, <Sami.Mujawar@arm.com>,
	<jon@solid-run.com>, <eric.auger@redhat.com>
Subject: [PATCH v3 01/10] ACPI/IORT: Add support for RMR node parsing
Date: Tue, 20 Apr 2021 10:27:42 +0200
Message-ID: <20210420082751.1829-2-shameerali.kolothum.thodi@huawei.com> (raw)
In-Reply-To: <20210420082751.1829-1-shameerali.kolothum.thodi@huawei.com>

Add support for parsing RMR node information from ACPI.
Find associated stream id and smmu node info from the
RMR node and populate a linked list with RMR memory
descriptors.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/acpi/arm64/iort.c | 104 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 103 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 2494138a6905..bd96c5e3b36e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -40,6 +40,19 @@ struct iort_fwnode {
 static LIST_HEAD(iort_fwnode_list);
 static DEFINE_SPINLOCK(iort_fwnode_lock);
 
+/*
+ * One entry for IORT RMR.
+ */
+struct iort_rmr_entry {
+	struct list_head list;
+	u32 sid;
+	struct acpi_iort_node *smmu;
+	struct acpi_iort_rmr_desc *rmr_desc;
+	u32 flags;
+};
+
+static LIST_HEAD(iort_rmr_list);         /* list of RMR regions from ACPI */
+
 /**
  * iort_set_fwnode() - Create iort_fwnode and use it to register
  *		       iommu data in the iort_fwnode_list
@@ -393,7 +406,8 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 		if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT ||
 		    node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX ||
 		    node->type == ACPI_IORT_NODE_SMMU_V3 ||
-		    node->type == ACPI_IORT_NODE_PMCG) {
+		    node->type == ACPI_IORT_NODE_PMCG ||
+		    node->type == ACPI_IORT_NODE_RMR) {
 			*id_out = map->output_base;
 			return parent;
 		}
@@ -1659,6 +1673,91 @@ static void __init iort_enable_acs(struct acpi_iort_node *iort_node)
 #else
 static inline void iort_enable_acs(struct acpi_iort_node *iort_node) { }
 #endif
+static int iort_rmr_desc_valid(struct acpi_iort_rmr_desc *desc, u32 count)
+{
+	int i, j;
+
+	for (i = 0; i < count; i++) {
+		u64 end, start = desc[i].base_address, length = desc[i].length;
+
+		if (!IS_ALIGNED(start, SZ_64K) || !IS_ALIGNED(length, SZ_64K))
+			return -EINVAL;
+
+		end = start + length - 1;
+
+		/* Check for address overlap */
+		for (j = i + 1; j < count; j++) {
+			u64 e_start = desc[j].base_address;
+			u64 e_end = e_start + desc[j].length - 1;
+
+			if (start <= e_end && end >= e_start)
+				return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int __init iort_parse_rmr(struct acpi_iort_node *iort_node)
+{
+	struct acpi_iort_node *smmu;
+	struct iort_rmr_entry *e;
+	struct acpi_iort_rmr *rmr;
+	struct acpi_iort_rmr_desc *rmr_desc;
+	u32 map_count = iort_node->mapping_count;
+	u32  sid;
+	int i, ret = 0;
+
+	if (iort_node->type != ACPI_IORT_NODE_RMR)
+		return 0;
+
+	if (!iort_node->mapping_offset || map_count != 1) {
+		pr_err(FW_BUG "Invalid ID mapping, skipping RMR node %p\n",
+		       iort_node);
+		return -EINVAL;
+	}
+
+	/* Retrieve associated smmu and stream id */
+	smmu = iort_node_get_id(iort_node, &sid, 0);
+	if (!smmu) {
+		pr_err(FW_BUG "Invalid SMMU reference, skipping RMR node %p\n",
+		       iort_node);
+		return -EINVAL;
+	}
+
+	/* Retrieve RMR data */
+	rmr = (struct acpi_iort_rmr *)iort_node->node_data;
+	if (!rmr->rmr_offset || !rmr->rmr_count) {
+		pr_err(FW_BUG "Invalid RMR descriptor array, skipping RMR node %p\n",
+		       iort_node);
+		return -EINVAL;
+	}
+
+	rmr_desc = ACPI_ADD_PTR(struct acpi_iort_rmr_desc, iort_node,
+				rmr->rmr_offset);
+
+	ret = iort_rmr_desc_valid(rmr_desc, rmr->rmr_count);
+	if (ret) {
+		pr_err(FW_BUG "Invalid RMR descriptor[%d] for node %p, skipping...\n",
+		       i, iort_node);
+		return ret;
+	}
+
+	for (i = 0; i < rmr->rmr_count; i++, rmr_desc++) {
+		e = kmalloc(sizeof(*e), GFP_KERNEL);
+		if (!e)
+			return -ENOMEM;
+
+		e->sid = sid;
+		e->smmu = smmu;
+		e->rmr_desc = rmr_desc;
+		e->flags = rmr->flags;
+
+		list_add_tail(&e->list, &iort_rmr_list);
+	}
+
+	return 0;
+}
 
 static void __init iort_init_platform_devices(void)
 {
@@ -1688,6 +1787,9 @@ static void __init iort_init_platform_devices(void)
 
 		iort_enable_acs(iort_node);
 
+		if (iort_table->revision == 3)
+			iort_parse_rmr(iort_node);
+
 		ops = iort_get_dev_cfg(iort_node);
 		if (ops) {
 			fwnode = acpi_alloc_fwnode_static();
-- 
2.17.1


  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-20  8:27 [PATCH v3 00/10] ACPI/IORT: Support for IORT RMR node Shameer Kolothum
2021-04-20  8:27 ` Shameer Kolothum [this message]
2021-04-20  8:27 ` [PATCH v3 02/10] iommu/dma: Introduce generic helper to retrieve RMR info Shameer Kolothum
2021-04-20 12:04   ` kernel test robot
2021-04-20 12:32   ` kernel test robot
2021-04-20 12:59   ` kernel test robot
2021-04-20  8:27 ` [PATCH v3 03/10] ACPI/IORT: Add a helper to retrieve RMR memory regions Shameer Kolothum
2021-04-20  8:27 ` [PATCH v3 04/10] iommu/dma: Add a helper function to reserve RMRs for IOMMU drivers Shameer Kolothum
2021-04-20 12:07   ` kernel test robot
2021-04-20 13:32   ` kernel test robot
2021-04-20  8:27 ` [PATCH v3 05/10] iommu/arm-smmu-v3: Introduce strtab init helper Shameer Kolothum
2021-04-20  8:27 ` [PATCH v3 06/10] iommu/arm-smmu-v3: Add bypass flag to arm_smmu_write_strtab_ent() Shameer Kolothum
2021-04-20  8:27 ` [PATCH v3 07/10] iommu/arm-smmu-v3: Get associated RMR info and install bypass STE Shameer Kolothum
2021-04-20  8:27 ` [PATCH v3 08/10] iommu/arm-smmu-v3: Reserve any RMR regions associated with a dev Shameer Kolothum
2021-05-07 10:01   ` Robin Murphy
2021-05-10  9:19     ` Shameerali Kolothum Thodi
2021-05-10 14:22       ` Robin Murphy
2021-04-20  8:27 ` [PATCH v3 09/10] iommu/arm-smmu: Get associated RMR info and install bypass SMR Shameer Kolothum
2021-05-06 15:17   ` Steven Price
2021-05-07  9:52     ` Robin Murphy
2021-05-10  8:40     ` Shameerali Kolothum Thodi
2021-05-10 11:51       ` Jon Nettleton
2021-04-20  8:27 ` [PATCH v3 10/10] iommu/arm-smmu: Reserve any RMR regions associated with a dev Shameer Kolothum
2021-04-20 14:18   ` kernel test robot

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