[RESEND,PATCH 07/13] iommu/mediatek: Add smi_larb info about device

Chao Hao
2019-11-04T11:53:17Z

All the devices which used iommu are connected to SMI_larb port,
so when different devices driver execute initialization, iommu
can check larb_id and port_id to distinguish them and then make
them match to iommu_group accordingly. We also add dom_cnt variable
to describe the number of mtk_iommu_domain.

Larb_id and port_id define can refer to "mtxxxx-larb-port.h(ex:
mt6779-larb-port.h)" file

Signed-off-by: Chao Hao <chao.hao@mediatek.com>
---
drivers/iommu/mtk_iommu.c | 50 ++++++++++++++++++++++++++++++++-------
drivers/iommu/mtk_iommu.h | 1 +
2 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 27995b2b29a6..0eacbc473374 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -126,6 +126,7 @@ struct mtk_iommu_domain {
struct mtk_iommu_pgtable {
struct io_pgtable_cfg cfg;
struct io_pgtable_ops *iop;
+ struct device *init_dev;
struct list_head m4u_dom_v2;
};

@@ -177,22 +178,35 @@ static struct mtk_iommu_data *mtk_iommu_get_m4u_data(void)
return NULL;
}

-static u32 get_domain_id(void)
+static u32 get_domain_id(struct mtk_iommu_data *data, u32 portid)
{
- /* only support one mtk_iommu_domain currently */
- return 0;
+ u32 dom_id = 0;
+ int i;
+
+ /* only support one mtk_iommu_domain currently(dom_cnt = 1) */
+ for (i = 0; i < data->plat_data->dom_cnt; i++)
+ return i;
+
+ return dom_id;
}

-static u32 mtk_iommu_get_domain_id(void)
+static u32 mtk_iommu_get_domain_id(struct device *dev)
{
- return get_domain_id();
+ struct iommu_fwspec *fwspec = dev->iommu_fwspec;
+ struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv;
+ u32 portid = fwspec->ids[0];
+
+ return get_domain_id(data, portid);
}

static struct mtk_iommu_domain *get_mtk_domain(struct device *dev)
{
struct mtk_iommu_data *data = dev->iommu_fwspec->iommu_priv;
struct mtk_iommu_domain *dom;
- u32 domain_id = mtk_iommu_get_domain_id();
+ u32 domain_id = mtk_iommu_get_domain_id(dev);
+
+ if (domain_id >= data->plat_data->dom_cnt)
+ return NULL;

list_for_each_entry(dom, &data->pgtable->m4u_dom_v2, list) {
if (dom->id == domain_id)
@@ -431,11 +445,18 @@ static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
struct mtk_iommu_pgtable *pgtable = mtk_iommu_get_pgtable();
struct mtk_iommu_data *data = mtk_iommu_get_m4u_data();
struct mtk_iommu_domain *dom;
+ struct device *dev;

if (type != IOMMU_DOMAIN_DMA)
return NULL;

- if (!pgtable) {
+ if (pgtable) {
+ dev = pgtable->init_dev;
+ if (!data->m4u_group) {
+ pr_err("%s, find m4u_group failed\n", __func__);
+ return NULL;
+ }
+ } else {
pr_err("%s, pgtable is not ready\n", __func__);
return NULL;
}
@@ -447,8 +468,11 @@ static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)
if (iommu_get_dma_cookie(&dom->domain))
goto free_dom;

+ dom->id = mtk_iommu_get_domain_id(dev);
+ if (dom->id >= data->plat_data->dom_cnt)
+ goto put_dma_cookie;
+
dom->group = data->m4u_group;
- dom->id = mtk_iommu_get_domain_id();
/* Update our support page sizes bitmap */
dom->domain.pgsize_bitmap = pgtable->cfg.pgsize_bitmap;

@@ -459,6 +483,8 @@ static struct iommu_domain *mtk_iommu_domain_alloc(unsigned type)

return &dom->domain;

+put_dma_cookie:
+ iommu_put_dma_cookie(&dom->domain);
free_dom:
kfree(dom);
return NULL;
@@ -619,6 +645,10 @@ static struct iommu_group *mtk_iommu_device_group(struct device *dev)
} else {
iommu_group_ref_get(data->m4u_group);
}
+
+ /* save the latest init device */
+ pgtable->init_dev = dev;
+
return data->m4u_group;
}

@@ -927,12 +957,14 @@ static const struct mtk_iommu_plat_data mt2712_data = {
.has_4gb_mode = true,
.has_bclk = true,
.has_vld_pa_rng = true,
+ .dom_cnt = 1,
.larbid_remap[0] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
.inv_sel_reg = REG_MMU_INV_SEL,
};

static const struct mtk_iommu_plat_data mt6779_data = {
.m4u_plat = M4U_MT6779,
+ .dom_cnt = 1,
.larbid_remap[0] = {0, 1, 2, 3, 5, 7, 10, 9},
/* vp6a, vp6b, mdla/core2, mdla/edmc*/
.larbid_remap[1] = {2, 0, 3, 1},
@@ -948,6 +980,7 @@ static const struct mtk_iommu_plat_data mt8173_data = {
.has_4gb_mode = true,
.has_bclk = true,
.reset_axi = true,
+ .dom_cnt = 1,
.larbid_remap[0] = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */
.inv_sel_reg = REG_MMU_INV_SEL,
};
@@ -955,6 +988,7 @@ static const struct mtk_iommu_plat_data mt8173_data = {
static const struct mtk_iommu_plat_data mt8183_data = {
.m4u_plat = M4U_MT8183,
.reset_axi = true,
+ .dom_cnt = 1,
.larbid_remap[0] = {0, 4, 5, 6, 7, 2, 3, 1},
.inv_sel_reg = REG_MMU_INV_SEL,
};
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index dd5f19f78b62..6801f8496fcc 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -49,6 +49,7 @@ struct mtk_iommu_plat_data {
bool has_misc_ctrl[2];
u32 inv_sel_reg;
u32 m4u1_mask;
+ u32 dom_cnt;
unsigned char larbid_remap[2][MTK_LARB_NR_MAX];
};