Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-10 22:21:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

iommu/io-pgtable-arm-v7s: Support IOMMU_MMIO flag

Browse Source 
Teach the short-descriptor format to create Device mappings when asked.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2016-04-05 12:39:32 +01:00 committed by Joerg Roedel
parent fb948251e4
commit e88ccab12a
1 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/iommu/io-pgtable-arm-v7s.c
View File

@ -260,9 +260,10 @@ static arm_v7s_iopte arm_v7s_prot_to_pte(int prot, int lvl,
struct io_pgtable_cfg *cfg)
{
bool ap = !(cfg->quirks & IO_PGTABLE_QUIRK_NO_PERMS);
arm_v7s_iopte pte = ARM_V7S_ATTR_NG | ARM_V7S_ATTR_S |
ARM_V7S_ATTR_TEX(1);
arm_v7s_iopte pte = ARM_V7S_ATTR_NG | ARM_V7S_ATTR_S;
if (!(prot & IOMMU_MMIO))
pte |= ARM_V7S_ATTR_TEX(1);
if (ap) {
pte |= ARM_V7S_PTE_AF | ARM_V7S_PTE_AP_UNPRIV;
if (!(prot & IOMMU_WRITE))
@ -272,7 +273,9 @@ static arm_v7s_iopte arm_v7s_prot_to_pte(int prot, int lvl,
if ((prot & IOMMU_NOEXEC) && ap)
pte |= ARM_V7S_ATTR_XN(lvl);
if (prot & IOMMU_CACHE)
if (prot & IOMMU_MMIO)
pte |= ARM_V7S_ATTR_B;
else if (prot & IOMMU_CACHE)
pte |= ARM_V7S_ATTR_B | ARM_V7S_ATTR_C;
return pte;
@ -281,10 +284,13 @@ static arm_v7s_iopte arm_v7s_prot_to_pte(int prot, int lvl,
static int arm_v7s_pte_to_prot(arm_v7s_iopte pte, int lvl)
{
int prot = IOMMU_READ;
arm_v7s_iopte attr = pte >> ARM_V7S_ATTR_SHIFT(lvl);
if (pte & (ARM_V7S_PTE_AP_RDONLY << ARM_V7S_ATTR_SHIFT(lvl)))
if (attr & ARM_V7S_PTE_AP_RDONLY)
prot |= IOMMU_WRITE;
if (pte & ARM_V7S_ATTR_C)
if ((attr & (ARM_V7S_TEX_MASK << ARM_V7S_TEX_SHIFT)) == 0)
prot |= IOMMU_MMIO;
else if (pte & ARM_V7S_ATTR_C)
prot |= IOMMU_CACHE;
return prot;