diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hyperv.h | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 38100e80360a..9c19149c0e1a 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -29,6 +29,48 @@ #pragma pack(push, 1) +/* + * Types for GPADL, decides is how GPADL header is created. + * + * It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the + * same as HV_HYP_PAGE_SIZE. + * + * If PAGE_SIZE is bigger than HV_HYP_PAGE_SIZE, the headers of ring buffers + * will be of PAGE_SIZE, however, only the first HV_HYP_PAGE will be put + * into gpadl, therefore the number for HV_HYP_PAGE and the indexes of each + * HV_HYP_PAGE will be different between different types of GPADL, for example + * if PAGE_SIZE is 64K: + * + * BUFFER: + * + * gva: |-- 64k --|-- 64k --| ... | + * gpa: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | + * index: 0 1 2 15 16 17 18 .. 31 32 ... + * | | ... | | | ... | ... + * v V V V V V + * gpadl: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... | + * index: 0 1 2 ... 15 16 17 18 .. 31 32 ... + * + * RING: + * + * | header | data | header | data | + * gva: |-- 64k --|-- 64k --| ... |-- 64k --|-- 64k --| ... | + * gpa: | 4k | .. | 4k | 4k | ... | 4k | ... | 4k | .. | 4k | .. | ... | + * index: 0 1 16 17 18 31 ... n n+1 n+16 ... 2n + * | / / / | / / + * | / / / | / / + * | / / ... / ... | / ... / + * | / / / | / / + * | / / / | / / + * V V V V V V v + * gpadl: | 4k | 4k | ... | ... | 4k | 4k | ... | + * index: 0 1 2 ... 16 ... n-15 n-14 n-13 ... 2n-30 + */ +enum hv_gpadl_type { + HV_GPADL_BUFFER, + HV_GPADL_RING +}; + /* Single-page buffer */ struct hv_page_buffer { u32 len; @@ -111,7 +153,7 @@ struct hv_ring_buffer { } feature_bits; /* Pad it to PAGE_SIZE so that data starts on page boundary */ - u8 reserved2[4028]; + u8 reserved2[PAGE_SIZE - 68]; /* * Ring data starts here + RingDataStartOffset @@ -120,6 +162,10 @@ struct hv_ring_buffer { u8 buffer[]; } __packed; +/* Calculate the proper size of a ringbuffer, it must be page-aligned */ +#define VMBUS_RING_SIZE(payload_sz) PAGE_ALIGN(sizeof(struct hv_ring_buffer) + \ + (payload_sz)) + struct hv_ring_buffer_info { struct hv_ring_buffer *ring_buffer; u32 ring_size; /* Include the shared header */ |