mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-03 23:58:05 +00:00
Code Issues Releases Wiki Activity

iommu/mediatek: Fix iova_to_phys PA start for 4GB mode

Browse source 
In M4U 4GB mode, the physical address is remapped as below:

CPU Physical address:

====================

0      1G       2G     3G       4G     5G
|---A---|---B---|---C---|---D---|---E---|
+--I/O--+------------Memory-------------+

IOMMU output physical address:
 =============================

                                4G      5G     6G      7G      8G
                                |---E---|---B---|---C---|---D---|
                                +------------Memory-------------+

The Region 'A'(I/O) can not be mapped by M4U; For Region 'B'/'C'/'D', the
bit32 of the CPU physical address always is needed to set, and for Region
'E', the CPU physical address keep as is. something looks like this:
CPU PA         ->    M4U OUTPUT PA
0x4000_0000          0x1_4000_0000 (Add bit32)
0x8000_0000          0x1_8000_0000 ...
0xc000_0000          0x1_c000_0000 ...
0x1_0000_0000        0x1_0000_0000 (No change)

Additionally, the iommu consumers always use the CPU phyiscal address.

The PA in the iova_to_phys that is got from v7s always is u32, But
from the CPU point of view, PA only need add BIT(32) when PA < 0x4000_0000.

Fixes: 30e2fccf95 ("iommu/mediatek: Enlarge the validate PA range
for 4GB mode")
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yong Wu 2019-08-24 11:01:50 +08:00 committed by Joerg Roedel
parent 42d42c76f8
commit 76ce65464f
1 changed files with 25 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
drivers/iommu/mtk_iommu.c
View file

@ -107,6 +107,30 @@ struct mtk_iommu_domain {
static const struct iommu_ops mtk_iommu_ops;
/*
* In M4U 4GB mode, the physical address is remapped as below:
*
* CPU Physical address:
* ====================
*
* 0 1G 2G 3G 4G 5G
* |---A---|---B---|---C---|---D---|---E---|
* +--I/O--+------------Memory-------------+
*
* IOMMU output physical address:
* =============================
*
* 4G 5G 6G 7G 8G
* |---E---|---B---|---C---|---D---|
* +------------Memory-------------+
*
* The Region 'A'(I/O) can NOT be mapped by M4U; For Region 'B'/'C'/'D', the
* bit32 of the CPU physical address always is needed to set, and for Region
* 'E', the CPU physical address keep as is.
* Additionally, The iommu consumers always use the CPU phyiscal address.
*/
#define MTK_IOMMU_4GB_MODE_REMAP_BASE 0x40000000
static LIST_HEAD(m4ulist); /* List all the M4U HWs */
#define for_each_m4u(data) list_for_each_entry(data, &m4ulist, list)
@ -401,7 +425,7 @@ static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
pa = dom->iop->iova_to_phys(dom->iop, iova);
spin_unlock_irqrestore(&dom->pgtlock, flags);
if (data->enable_4GB)
if (data->enable_4GB && pa < MTK_IOMMU_4GB_MODE_REMAP_BASE)
pa |= BIT_ULL(32);
return pa;