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From: John Garry <john.garry@huawei.com>
To: <lorenzo.pieralisi@arm.com>, <guohanjun@huawei.com>,
	<sudeep.holla@arm.com>, <robin.murphy@arm.com>,
	<mark.rutland@arm.com>,  <will@kernel.org>
Cc: nleeder@codeaurora.org, rjw@rjwysocki.net,
	linux-kernel@vger.kernel.org, linuxarm@huawei.com,
	iommu@lists.linux-foundation.org,
	linux-arm-kernel@lists.infradead.org, lenb@kernel.org
Subject: [RFC PATCH 2/6] iommu/arm-smmu-v3: Record IIDR in arm_smmu_device structure
Date: Mon, 30 Sep 2019 22:33:47 +0800
Message-ID: <1569854031-237636-3-git-send-email-john.garry@huawei.com> (raw)
In-Reply-To: <1569854031-237636-1-git-send-email-john.garry@huawei.com>

To allow other devices know the SMMU HW IIDR, record the IIDR contents as
the first member of the arm_smmu_device structure.

In storing as the first member, it saves exposing SMMU APIs, which are
nicely self-contained today.

Signed-off-by: John Garry <john.garry@huawei.com>
---
 drivers/iommu/arm-smmu-v3.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 40f4757096c3..1ed3ef0f1ec3 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -70,6 +70,8 @@
 #define IDR1_SSIDSIZE			GENMASK(10, 6)
 #define IDR1_SIDSIZE			GENMASK(5, 0)
 
+#define ARM_SMMU_IIDR                  0x18
+
 #define ARM_SMMU_IDR5			0x14
 #define IDR5_STALL_MAX			GENMASK(31, 16)
 #define IDR5_GRAN64K			(1 << 6)
@@ -546,6 +548,7 @@ struct arm_smmu_strtab_cfg {
 
 /* An SMMUv3 instance */
 struct arm_smmu_device {
+	u32						iidr; /* must be first member */
 	struct device			*dev;
 	void __iomem			*base;
 
@@ -3153,6 +3156,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	iommu_device_set_ops(&smmu->iommu, &arm_smmu_ops);
 	iommu_device_set_fwnode(&smmu->iommu, dev->fwnode);
 
+	smmu->iidr = readl(smmu->base + ARM_SMMU_IIDR);
+
 	ret = iommu_device_register(&smmu->iommu);
 	if (ret) {
 		dev_err(dev, "Failed to register iommu\n");
-- 
2.17.1

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  parent reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-30 14:33 [RFC PATCH 0/6] SMMUv3 PMCG IMP DEF event support John Garry
2019-09-30 14:33 ` [RFC PATCH 1/6] ACPI/IORT: Set PMCG device parent John Garry
2019-10-15  2:35   ` Hanjun Guo
2019-10-15  9:07     ` John Garry
2019-09-30 14:33 ` John Garry [this message]
2019-09-30 14:33 ` [RFC PATCH 3/6] perf/smmuv3: Retrieve parent SMMUv3 IIDR John Garry
2019-09-30 14:33 ` [RFC PATCH 4/6] perf/smmuv3: Support HiSilicon hip08 (hi1620) IMP DEF events John Garry
2019-09-30 14:33 ` [RFC PATCH 5/6] perf/smmuv3: Match implementation options based on parent SMMU IIDR John Garry
2019-09-30 14:33 ` [RFC PATCH 6/6] ACPI/IORT: Drop code to set the PMCG software-defined model John Garry
2019-10-15  3:06   ` Hanjun Guo
2019-10-15  8:47     ` John Garry
2019-10-15 18:00 ` [RFC PATCH 0/6] SMMUv3 PMCG IMP DEF event support Robin Murphy
2019-10-16  8:47   ` John Garry
2019-10-16 10:51     ` Robin Murphy
2019-10-16 12:07       ` John Garry

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