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From: Chao Hao <chao.hao@mediatek.com>
To: Joerg Roedel <joro@8bytes.org>, Rob Herring <robh+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>
Cc: Anan Sun <anan.sun@mediatek.com>,
	devicetree@vger.kernel.org, Cui Zhang <cui.zhang@mediatek.com>,
	Jun Yan <jun.yan@mediatek.com>,
	wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org,
	Chao Hao <chao.hao@mediatek.com>,
	iommu@lists.linux-foundation.org,
	linux-mediatek@lists.infradead.org,
	Miles Chen <miles.chen@mediatek.com>,
	linux-arm-kernel@lists.infradead.org,
	Guangming Cao <guangming.cao@mediatek.com>
Subject: [RESEND,PATCH 03/13] iommu/mediatek: Add mtk_iommu_pgtable structure
Date: Mon, 4 Nov 2019 19:52:28 +0800	[thread overview]
Message-ID: <20191104115238.2394-4-chao.hao@mediatek.com> (raw)
In-Reply-To: <20191104115238.2394-1-chao.hao@mediatek.com>

Start with this patch, we will change the SW architecture
to support multiple domains. SW architecture will has a big change,
so we need to modify a little bit by more than one patch.
The new SW overall architecture is as below:

				iommu0   iommu1
				  |	    |
				  -----------
					|
				mtk_iommu_pgtable
					|
			------------------------------------------
			|		     |			 |
		mtk_iommu_domain1   mtk_iommu_domain2  mtk_iommu_domain3
			|                    |                   |
		iommu_group1         iommu_group2           iommu_group3
			|                    |                   |
		iommu_domain1       iommu_domain2	    iommu_domain3
			|                    |                   |
		iova region1(normal)  iova region2(CCU)    iova region3(VPU)

For current structure, no matter how many iommus there are,
they use the same page table to simplify the usage of module.
In order to make the software architecture more explicit, this
patch will create a global mtk_iommu_pgtable structure to describe
page table and all the iommus use it.
The diagram is as below:

	mtk_iommu_data1(MM)       mtk_iommu_data2(APU)
		|			   |
		|			   |
		------mtk_iommu_pgtable-----

We need to create global mtk_iommu_pgtable to include all the iova
regions firstly and special iova regions by divided based on it,
so the information of pgtable needs to be created in device_group.

Signed-off-by: Chao Hao <chao.hao@mediatek.com>
---
 drivers/iommu/mtk_iommu.c | 84 +++++++++++++++++++++++++++++++++++++++
 drivers/iommu/mtk_iommu.h |  1 +
 2 files changed, 85 insertions(+)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index f2847e661137..fcbde6b0f58d 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -123,6 +123,12 @@ struct mtk_iommu_domain {
 	struct iommu_domain		domain;
 };
 
+struct mtk_iommu_pgtable {
+	struct io_pgtable_cfg	cfg;
+	struct io_pgtable_ops	*iop;
+};
+
+static struct mtk_iommu_pgtable *share_pgtable;
 static const struct iommu_ops mtk_iommu_ops;
 
 /*
@@ -170,6 +176,11 @@ static struct mtk_iommu_data *mtk_iommu_get_m4u_data(void)
 	return NULL;
 }
 
+static struct mtk_iommu_pgtable *mtk_iommu_get_pgtable(void)
+{
+	return share_pgtable;
+}
+
 static struct mtk_iommu_domain *to_mtk_domain(struct iommu_domain *dom)
 {
 	return container_of(dom, struct mtk_iommu_domain, domain);
@@ -322,6 +333,13 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom)
 {
 	struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
 
+	if (data->pgtable) {
+		dom->cfg = data->pgtable->cfg;
+		dom->iop = data->pgtable->iop;
+		dom->domain.pgsize_bitmap = data->pgtable->cfg.pgsize_bitmap;
+		return 0;
+	}
+
 	dom->cfg = (struct io_pgtable_cfg) {
 		.quirks = IO_PGTABLE_QUIRK_ARM_NS |
 			IO_PGTABLE_QUIRK_NO_PERMS |
@@ -345,6 +363,61 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom)
 	return 0;
 }
 
+static struct mtk_iommu_pgtable *create_pgtable(struct mtk_iommu_data *data)
+{
+	struct mtk_iommu_pgtable *pgtable;
+
+	pgtable = kzalloc(sizeof(*pgtable), GFP_KERNEL);
+	if (!pgtable)
+		return ERR_PTR(-ENOMEM);
+
+	pgtable->cfg = (struct io_pgtable_cfg) {
+		.quirks = IO_PGTABLE_QUIRK_ARM_NS |
+			IO_PGTABLE_QUIRK_NO_PERMS |
+			IO_PGTABLE_QUIRK_TLBI_ON_MAP |
+			IO_PGTABLE_QUIRK_ARM_MTK_EXT,
+		.pgsize_bitmap = mtk_iommu_ops.pgsize_bitmap,
+		.ias = 32,
+		.oas = 34,
+		.tlb = &mtk_iommu_flush_ops,
+		.iommu_dev = data->dev,
+	};
+
+	pgtable->iop = alloc_io_pgtable_ops(ARM_V7S, &pgtable->cfg, data);
+	if (!pgtable->iop) {
+		dev_err(data->dev, "Failed to alloc io pgtable\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	dev_info(data->dev, "%s create pgtable done\n", __func__);
+
+	return pgtable;
+}
+
+static int mtk_iommu_attach_pgtable(struct mtk_iommu_data *data,
+				    struct device *dev)
+{
+	struct mtk_iommu_pgtable *pgtable = mtk_iommu_get_pgtable();
+
+	/* create share pgtable */
+	if (!pgtable) {
+		pgtable = create_pgtable(data);
+		if (IS_ERR(pgtable)) {
+			dev_err(data->dev, "Failed to create pgtable\n");
+			return -ENOMEM;
+		}
+
+		share_pgtable = pgtable;
+	}
+
+	/* binding to pgtable */
+	data->pgtable = pgtable;
+
+	dev_info(data->dev, "m4u%d attach_pgtable done!\n", data->m4u_id);
+
+	return 0;
+}
+
 static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
 {
 	struct mtk_iommu_domain *dom;
@@ -508,10 +581,21 @@ static void mtk_iommu_remove_device(struct device *dev)
 static struct iommu_group *mtk_iommu_device_group(struct device *dev)
 {
 	struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
+	struct mtk_iommu_pgtable *pgtable;
+	int ret = 0;
 
 	if (!data)
 		return ERR_PTR(-ENODEV);
 
+	pgtable = data->pgtable;
+	if (!pgtable) {
+		ret = mtk_iommu_attach_pgtable(data, dev);
+		if (ret) {
+			dev_err(data->dev, "Failed to device_group\n");
+			return NULL;
+		}
+	}
+
 	/* All the client devices are in the same m4u iommu-group */
 	if (!data->m4u_group) {
 		data->m4u_group = iommu_group_alloc();
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index 132dc765a40b..dd5f19f78b62 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -61,6 +61,7 @@ struct mtk_iommu_data {
 	struct clk			*bclk;
 	phys_addr_t			protect_base; /* protect memory base */
 	struct mtk_iommu_suspend_reg	reg;
+	struct mtk_iommu_pgtable	*pgtable;
 	struct mtk_iommu_domain		*m4u_dom;
 	struct iommu_group		*m4u_group;
 	bool                            enable_4GB;
-- 
2.18.0

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  parent reply	other threads:[~2019-11-04 11:52 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-04 11:52 [RESEND,PATCH 00/13] MT6779 IOMMU SUPPORT Chao Hao
2019-11-04 11:52 ` [RESEND,PATCH 01/13] dt-bindings: mediatek: Add bindings for MT6779 Chao Hao
2019-11-06 23:40   ` Rob Herring
2019-12-16 12:05   ` Yong Wu
2019-12-20 11:01     ` chao hao
2019-11-04 11:52 ` [RESEND,PATCH 02/13] iommu/mediatek: Add mt6779 IOMMU basic support Chao Hao
2019-12-16 12:07   ` Yong Wu
2019-12-25  6:58     ` chao hao
2019-11-04 11:52 ` Chao Hao [this message]
2019-12-16 12:13   ` [RESEND,PATCH 03/13] iommu/mediatek: Add mtk_iommu_pgtable structure Yong Wu
2019-12-31  9:39     ` chao hao
2020-02-15 12:17       ` Yong Wu
2020-02-25  7:25         ` chao hao
2020-02-26  6:36         ` chao hao
2019-11-04 11:52 ` [RESEND, PATCH 04/13] iommu/mediatek: Remove mtk_iommu_domain_finalise Chao Hao
2019-11-04 11:52 ` [RESEND, PATCH 05/13] iommu/mediatek: Remove pgtable info in mtk_iommu_domain Chao Hao
2019-11-04 11:52 ` [RESEND,PATCH 06/13] iommu/mediatek: Change get the way of m4u_group Chao Hao
2019-11-04 11:52 ` [RESEND,PATCH 07/13] iommu/mediatek: Add smi_larb info about device Chao Hao
2019-11-04 11:52 ` [RESEND,PATCH 08/13] iommu/mediatek: Add mtk_domain_data structure Chao Hao
2019-11-04 11:52 ` [RESEND, PATCH 09/13] iommu/mediatek: Remove the usage of m4u_dom variable Chao Hao
2019-11-04 11:52 ` [RESEND, PATCH 10/13] iommu/mediatek: Remove mtk_iommu_get_m4u_data api Chao Hao
2019-11-04 11:52 ` [RESEND,PATCH 11/13] iommu/mediatek: Add iova reserved function Chao Hao
2019-11-04 11:52 ` [RESEND, PATCH 12/13] iommu/mediatek: Change single domain to multiple domains Chao Hao
2019-11-04 11:52 ` [RESEND, PATCH 13/13] iommu/mediatek: Add multiple mtk_iommu_domain support for mt6779 Chao Hao

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