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iommu: Change kconfig around IOMMU_SVA

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Linus suggested that the kconfig here is confusing:

https://lore.kernel.org/all/CAHk-=wgUiAtiszwseM1p2fCJ+sC4XWQ+YN4TanFhUgvUqjr9Xw@mail.gmail.com/

Let's break it into three kconfigs controlling distinct things:

 - CONFIG_IOMMU_MM_DATA controls if the mm_struct has the additional
   fields for the IOMMU. Currently only PASID, but later patches store
   a struct iommu_mm_data *

 - CONFIG_ARCH_HAS_CPU_PASID controls if the arch needs the scheduling bit
   for keeping track of the ENQCMD instruction. x86 will select this if
   IOMMU_SVA is enabled

 - IOMMU_SVA controls if the IOMMU core compiles in the SVA support code
   for iommu driver use and the IOMMU exported API

This way ARM will not enable CONFIG_ARCH_HAS_CPU_PASID

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20231027000525.1278806-2-tina.zhang@intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2023-10-27 08:05:20 +08:00 committed by Joerg Roedel
parent 61f054f3c8
commit 8f23f5dba6
10 changed files with 16 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/Kconfig
View File

@ -301,6 +301,11 @@ config ARCH_HAS_DMA_CLEAR_UNCACHED
config ARCH_HAS_CPU_FINALIZE_INIT
bool
# The architecture has a per-task state that includes the mm's PASID
config ARCH_HAS_CPU_PASID
bool
select IOMMU_MM_DATA
# Select if arch init_task must go in the __init_task_data section
config ARCH_TASK_STRUCT_ON_STACK
bool

1
arch/x86/Kconfig
View File

@ -71,6 +71,7 @@ config X86
select ARCH_HAS_CACHE_LINE_SIZE
select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
select ARCH_HAS_CPU_FINALIZE_INIT
select ARCH_HAS_CPU_PASID if IOMMU_SVA
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DEBUG_VIRTUAL
select ARCH_HAS_DEBUG_VM_PGTABLE if !X86_PAE

2
arch/x86/kernel/traps.c
View File

@ -565,7 +565,7 @@ static bool fixup_iopl_exception(struct pt_regs *regs)
*/
static bool try_fixup_enqcmd_gp(void)
{
#ifdef CONFIG_IOMMU_SVA
#ifdef CONFIG_ARCH_HAS_CPU_PASID
u32 pasid;
/*

1
drivers/iommu/Kconfig
View File

@ -160,6 +160,7 @@ config IOMMU_DMA
# Shared Virtual Addressing
config IOMMU_SVA
select IOMMU_MM_DATA
bool
config FSL_PAMU

2
include/linux/iommu.h
View File

@ -1337,7 +1337,7 @@ static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream
return false;
}
#ifdef CONFIG_IOMMU_SVA
#ifdef CONFIG_IOMMU_MM_DATA
static inline void mm_pasid_init(struct mm_struct *mm)
{
mm->pasid = IOMMU_PASID_INVALID;

2
include/linux/mm_types.h
View File

@ -938,7 +938,7 @@ struct mm_struct {
#endif
struct work_struct async_put_work;
#ifdef CONFIG_IOMMU_SVA
#ifdef CONFIG_IOMMU_MM_DATA
u32 pasid;
#endif
#ifdef CONFIG_KSM

2
include/linux/sched.h
View File

@ -954,7 +954,7 @@ struct task_struct {
/* Recursion prevention for eventfd_signal() */
unsigned in_eventfd:1;
#endif
#ifdef CONFIG_IOMMU_SVA
#ifdef CONFIG_ARCH_HAS_CPU_PASID
unsigned pasid_activated:1;
#endif
#ifdef CONFIG_CPU_SUP_INTEL

2
kernel/fork.c
View File

@ -1179,7 +1179,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
tsk->use_memdelay = 0;
#endif
#ifdef CONFIG_IOMMU_SVA
#ifdef CONFIG_ARCH_HAS_CPU_PASID
tsk->pasid_activated = 0;
#endif

3
mm/Kconfig
View File

@ -1270,6 +1270,9 @@ config LOCK_MM_AND_FIND_VMA
bool
depends on !STACK_GROWSUP
config IOMMU_MM_DATA
bool
source "mm/damon/Kconfig"
endmenu

2
mm/init-mm.c
View File

@ -44,7 +44,7 @@ struct mm_struct init_mm = {
#endif
.user_ns = &init_user_ns,
.cpu_bitmap = CPU_BITS_NONE,
#ifdef CONFIG_IOMMU_SVA
#ifdef CONFIG_IOMMU_MM_DATA
.pasid = IOMMU_PASID_INVALID,
#endif
INIT_MM_CONTEXT(init_mm)