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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2018-12-19 09:52:15 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-21 06:20:46 +0100 |
| commit | c10c21efa4bccab486c2e6a047c13dfa6cf7426c (patch) | |
| tree | cd4df28268ab37a3d2aef950b70f8a8a1ffd6388 /arch/powerpc/include | |
| parent | powerpc/mm/iommu/vfio_spapr_tce: Change mm_iommu_get to reference a region (diff) | |
| download | linux-c10c21efa4bccab486c2e6a047c13dfa6cf7426c.tar.xz linux-c10c21efa4bccab486c2e6a047c13dfa6cf7426c.zip | |
powerpc/vfio/iommu/kvm: Do not pin device memory
This new memory does not have page structs as it is not plugged to
the host so gup() will fail anyway.
This adds 2 helpers:
- mm_iommu_newdev() to preregister the "memory device" memory so
the rest of API can still be used;
- mm_iommu_is_devmem() to know if the physical address is one of thise
new regions which we must avoid unpinning of.
This adds @mm to tce_page_is_contained() and iommu_tce_xchg() to test
if the memory is device memory to avoid pfn_to_page().
This adds a check for device memory in mm_iommu_ua_mark_dirty_rm() which
does delayed pages dirtying.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/iommu.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/mmu_context.h | 11 |
2 files changed, 14 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index 35db0cbc9222..a8aeac0db01c 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -218,8 +218,9 @@ extern void iommu_register_group(struct iommu_table_group *table_group, extern int iommu_add_device(struct device *dev); extern void iommu_del_device(struct device *dev); extern int __init tce_iommu_bus_notifier_init(void); -extern long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry, - unsigned long *hpa, enum dma_data_direction *direction); +extern long iommu_tce_xchg(struct mm_struct *mm, struct iommu_table *tbl, + unsigned long entry, unsigned long *hpa, + enum dma_data_direction *direction); #else static inline void iommu_register_group(struct iommu_table_group *table_group, int pci_domain_number, diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index 424899a7fac8..6ee8195a2ffb 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -24,6 +24,9 @@ extern bool mm_iommu_preregistered(struct mm_struct *mm); extern long mm_iommu_new(struct mm_struct *mm, unsigned long ua, unsigned long entries, struct mm_iommu_table_group_mem_t **pmem); +extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua, + unsigned long entries, unsigned long dev_hpa, + struct mm_iommu_table_group_mem_t **pmem); extern long mm_iommu_put(struct mm_struct *mm, struct mm_iommu_table_group_mem_t *mem); extern void mm_iommu_init(struct mm_struct *mm); @@ -39,8 +42,16 @@ extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, unsigned long ua, unsigned int pageshift, unsigned long *hpa); extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua); +extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, + unsigned int pageshift, unsigned long *size); extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); +#else +static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, + unsigned int pageshift, unsigned long *size) +{ + return false; +} #endif extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); extern void set_context(unsigned long id, pgd_t *pgd); |