diff options
| author | Oded Gabbay <oded.gabbay@gmail.com> | 2020-08-29 11:51:39 +0300 |
|---|---|---|
| committer | Oded Gabbay <oded.gabbay@gmail.com> | 2020-09-22 18:49:51 +0300 |
| commit | 3174ac9bb1045946ff563aa01d679809e87fb2db (patch) | |
| tree | 19b93d14a98445319a8c790c4a6b12b9a21ef52d /drivers/misc/habanalabs/common/habanalabs.h | |
| parent | f763946aefe67b3ea58696b75a930ba1ed886a83 (diff) | |
habanalabs: restructure hl_mmap
Arrange the hl_mmap code to be more structured and expandable for the
future. Add better defines that describe our usage of the vm_pgoff.
Note that I shamelessly took the code and defines from the amdkfd driver
(my previous driver).
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Diffstat (limited to 'drivers/misc/habanalabs/common/habanalabs.h')
| -rw-r--r-- | drivers/misc/habanalabs/common/habanalabs.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h index 6912f88a4b01..cdb7a672ed30 100644 --- a/drivers/misc/habanalabs/common/habanalabs.h +++ b/drivers/misc/habanalabs/common/habanalabs.h @@ -22,7 +22,19 @@ #define HL_NAME "habanalabs" -#define HL_MMAP_CB_MASK (0x8000000000000000ull >> PAGE_SHIFT) +/* Use upper bits of mmap offset to store habana driver specific information. + * bits[63:62] - Encode mmap type + * bits[45:0] - mmap offset value + * + * NOTE: struct vm_area_struct.vm_pgoff uses offset in pages. Hence, these + * defines are w.r.t to PAGE_SIZE + */ +#define HL_MMAP_TYPE_SHIFT (62 - PAGE_SHIFT) +#define HL_MMAP_TYPE_MASK (0x3ull << HL_MMAP_TYPE_SHIFT) +#define HL_MMAP_TYPE_CB (0x2ull << HL_MMAP_TYPE_SHIFT) + +#define HL_MMAP_OFFSET_VALUE_MASK (0x3FFFFFFFFFFFull >> PAGE_SHIFT) +#define HL_MMAP_OFFSET_VALUE_GET(off) (off & HL_MMAP_OFFSET_VALUE_MASK) #define HL_PENDING_RESET_PER_SEC 30 |