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iommu/mediatek: Support master use iova over 32bit 

After extending v7s, our pagetable already support iova reach
16GB(34bit). the master got the iova via dma_alloc_attrs may reach
34bits, but its HW register still is 32bit. then how to set the
bit32/bit33 iova? this depend on a SMI larb setting(bank_sel).

we separate whole 16GB iova to four banks:
bank: 0: 0~4G; 1: 4~8G; 2: 8-12G; 3: 12-16G;
The bank number is (iova >> 32).

We will preassign which bank the larbs belong to. currently we don't
have a interface for master to adjust its bank number.

Each a bank is a iova_region which is a independent iommu-domain.
the iova range for each iommu-domain can't cross 4G.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org> #for memory part
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-31-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Yong Wu 2021-01-11 19:19:11 +08:00 committed by Will Deacon
parent ab1d5281a6
commit 8d2c749e52
3 changed files with 20 additions and 6 deletions
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18
drivers/iommu/mtk_iommu.c
View File

@ -345,21 +345,27 @@ static int mtk_iommu_get_domain_id(struct device *dev,
return -EINVAL;
}
static void mtk_iommu_config(struct mtk_iommu_data *data,
struct device *dev, bool enable)
static void mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
bool enable, unsigned int domid)
{
struct mtk_smi_larb_iommu *larb_mmu;
unsigned int larbid, portid;
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
const struct mtk_iommu_iova_region *region;
int i;
for (i = 0; i < fwspec->num_ids; ++i) {
larbid = MTK_M4U_TO_LARB(fwspec->ids[i]);
portid = MTK_M4U_TO_PORT(fwspec->ids[i]);
larb_mmu = &data->larb_imu[larbid];
dev_dbg(dev, "%s iommu port: %d\n",
enable ? "enable" : "disable", portid);
region = data->plat_data->iova_region + domid;
larb_mmu->bank[portid] = upper_32_bits(region->iova_base);
dev_dbg(dev, "%s iommu for larb(%s) port %d dom %d bank %d.\n",
enable ? "enable" : "disable", dev_name(larb_mmu->dev),
portid, domid, larb_mmu->bank[portid]);
if (enable)
larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
@ -477,7 +483,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
pm_runtime_put(m4udev);
}
mtk_iommu_config(data, dev, true);
mtk_iommu_config(data, dev, true, domid);
return 0;
}
@ -489,7 +495,7 @@ static void mtk_iommu_detach_device(struct iommu_domain *domain,
if (!data)
return;
mtk_iommu_config(data, dev, false);
mtk_iommu_config(data, dev, false, 0);
}
static int mtk_iommu_map(struct iommu_domain *domain, unsigned long iova,

7
drivers/memory/mtk-smi.c
View File

@ -44,6 +44,10 @@
/* mt2712 */
#define SMI_LARB_NONSEC_CON(id) (0x380 + ((id) * 4))
#define F_MMU_EN BIT(0)
#define BANK_SEL(id) ({ \
u32 _id = (id) & 0x3; \
(_id << 8 | _id << 10 | _id << 12 | _id << 14); \
})
/* SMI COMMON */
#define SMI_BUS_SEL 0x220
@ -88,6 +92,7 @@ struct mtk_smi_larb { /* larb: local arbiter */
const struct mtk_smi_larb_gen *larb_gen;
int larbid;
u32 *mmu;
unsigned char *bank;
};
static int mtk_smi_clk_enable(const struct mtk_smi *smi)
@ -154,6 +159,7 @@ mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
if (dev == larb_mmu[i].dev) {
larb->larbid = i;
larb->mmu = &larb_mmu[i].mmu;
larb->bank = larb_mmu[i].bank;
return 0;
}
}
@ -172,6 +178,7 @@ static void mtk_smi_larb_config_port_gen2_general(struct device *dev)
for_each_set_bit(i, (unsigned long *)larb->mmu, 32) {
reg = readl_relaxed(larb->base + SMI_LARB_NONSEC_CON(i));
reg |= F_MMU_EN;
reg |= BANK_SEL(larb->bank[i]);
writel(reg, larb->base + SMI_LARB_NONSEC_CON(i));
}
}

1
include/soc/mediatek/smi.h
View File

@ -16,6 +16,7 @@
struct mtk_smi_larb_iommu {
struct device *dev;
unsigned int mmu;
unsigned char bank[32];
};
/*