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iommu/mediatek: Get the proper bankid for multi banks 

We preassign some ports in a special bank via the new defined
banks_portmsk. Put it in the plat_data means it is not expected to be
adjusted dynamically.

If the iommu id in the iommu consumer's dtsi node is inside this
banks_portmsk, then we switch it to this special iommu bank, and
initialise the IOMMU bank HW.

Each bank has the independent pgtable(4GB iova range). Each bank
is a independent iommu domain/group. Currently we don't separate different
iova ranges inside a bank.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://lore.kernel.org/r/20220503071427.2285-33-yong.wu@mediatek.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yong Wu 2022-05-03 15:14:23 +08:00 committed by Joerg Roedel
parent d72e0ff542
commit 57fb481f90
1 changed files with 48 additions and 7 deletions
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55
drivers/iommu/mtk_iommu.c
View File

@ -191,6 +191,7 @@ struct mtk_iommu_plat_data {
u8 banks_num;
bool banks_enable[MTK_IOMMU_BANK_MAX];
unsigned int banks_portmsk[MTK_IOMMU_BANK_MAX];
unsigned char larbid_remap[MTK_LARB_COM_MAX][MTK_LARB_SUBCOM_MAX];
};
@ -467,6 +468,30 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
static unsigned int mtk_iommu_get_bank_id(struct device *dev,
const struct mtk_iommu_plat_data *plat_data)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
unsigned int i, portmsk = 0, bankid = 0;
if (plat_data->banks_num == 1)
return bankid;
for (i = 0; i < fwspec->num_ids; i++)
portmsk |= BIT(MTK_M4U_TO_PORT(fwspec->ids[i]));
for (i = 0; i < plat_data->banks_num && i < MTK_IOMMU_BANK_MAX; i++) {
if (!plat_data->banks_enable[i])
continue;
if (portmsk & plat_data->banks_portmsk[i]) {
bankid = i;
break;
}
}
return bankid; /* default is 0 */
}
static int mtk_iommu_get_iova_region_id(struct device *dev,
const struct mtk_iommu_plat_data *plat_data)
{
@ -619,13 +644,14 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
struct list_head *hw_list = data->hw_list;
struct device *m4udev = data->dev;
struct mtk_iommu_bank_data *bank;
unsigned int bankid = 0;
unsigned int bankid;
int ret, region_id;
region_id = mtk_iommu_get_iova_region_id(dev, data->plat_data);
if (region_id < 0)
return region_id;
bankid = mtk_iommu_get_bank_id(dev, data->plat_data);
mutex_lock(&dom->mutex);
if (!dom->bank) {
/* Data is in the frstdata in sharing pgtable case. */
@ -797,27 +823,42 @@ static void mtk_iommu_release_device(struct device *dev)
iommu_fwspec_free(dev);
}
static int mtk_iommu_get_group_id(struct device *dev, const struct mtk_iommu_plat_data *plat_data)
{
unsigned int bankid;
/*
* If the bank function is enabled, each bank is a iommu group/domain.
* Otherwise, each iova region is a iommu group/domain.
*/
bankid = mtk_iommu_get_bank_id(dev, plat_data);
if (bankid)
return bankid;
return mtk_iommu_get_iova_region_id(dev, plat_data);
}
static struct iommu_group *mtk_iommu_device_group(struct device *dev)
{
struct mtk_iommu_data *c_data = dev_iommu_priv_get(dev), *data;
struct list_head *hw_list = c_data->hw_list;
struct iommu_group *group;
int regionid;
int groupid;
data = mtk_iommu_get_frst_data(hw_list);
if (!data)
return ERR_PTR(-ENODEV);
regionid = mtk_iommu_get_iova_region_id(dev, data->plat_data);
if (regionid < 0)
return ERR_PTR(regionid);
groupid = mtk_iommu_get_group_id(dev, data->plat_data);
if (groupid < 0)
return ERR_PTR(groupid);
mutex_lock(&data->mutex);
group = data->m4u_group[regionid];
group = data->m4u_group[groupid];
if (!group) {
group = iommu_group_alloc();
if (!IS_ERR(group))
data->m4u_group[regionid] = group;
data->m4u_group[groupid] = group;
} else {
iommu_group_ref_get(group);
}