These functions are used to check and set specific bits in a Device Table Entry. For instance, they can be used to modify the setting of the NMIPass field.
Currently, these functions are used only for ACPI-specified devices. However, an interrupt is to be allocated with NMI as delivery mode, the Device Table Entry needs modified accordingly in irq_remapping_alloc(). As a first step expose these two functions. No functional changes. Cc: Andi Kleen <[email protected]> Cc: "Ravi V. Shankar" <[email protected]> Cc: Joerg Roedel <[email protected]> Cc: Suravee Suthikulpanit <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Signed-off-by: Ricardo Neri <[email protected]> --- Changes since v5: * Introduced this patch Changes since v4: * N/A Changes since v3: * N/A Changes since v2: * N/A Changes since v1: * N/A --- drivers/iommu/amd/amd_iommu.h | 3 +++ drivers/iommu/amd/init.c | 4 ++-- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h index 1ab31074f5b3..9f3d1564c84e 100644 --- a/drivers/iommu/amd/amd_iommu.h +++ b/drivers/iommu/amd/amd_iommu.h @@ -128,4 +128,7 @@ static inline void amd_iommu_apply_ivrs_quirks(void) { } extern void amd_iommu_domain_set_pgtable(struct protection_domain *domain, u64 *root, int mode); + +extern void set_dev_entry_bit(u16 devid, u8 bit); +extern int get_dev_entry_bit(u16 devid, u8 bit); #endif diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index b4a798c7b347..823e76b284f1 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -914,7 +914,7 @@ static void iommu_enable_gt(struct amd_iommu *iommu) } /* sets a specific bit in the device table entry. */ -static void set_dev_entry_bit(u16 devid, u8 bit) +void set_dev_entry_bit(u16 devid, u8 bit) { int i = (bit >> 6) & 0x03; int _bit = bit & 0x3f; @@ -922,7 +922,7 @@ static void set_dev_entry_bit(u16 devid, u8 bit) amd_iommu_dev_table[devid].data[i] |= (1UL << _bit); } -static int get_dev_entry_bit(u16 devid, u8 bit) +int get_dev_entry_bit(u16 devid, u8 bit) { int i = (bit >> 6) & 0x03; int _bit = bit & 0x3f; -- 2.17.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
