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habanalabs: restructure hl_mmap

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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>
This commit is contained in:
Oded Gabbay 2020-08-29 11:51:39 +03:00
parent f763946aef
commit 3174ac9bb1
3 changed files with 20 additions and 4 deletions
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2
drivers/misc/habanalabs/common/command_buffer.c
View File

@ -183,7 +183,7 @@ int hl_cb_create(struct hl_device *hdev, struct hl_cb_mgr *mgr,
* idr is 32-bit so we can safely OR it with a mask that is above
* 32 bit
*/
*handle = cb->id | HL_MMAP_CB_MASK;
*handle = cb->id | HL_MMAP_TYPE_CB;
*handle <<= PAGE_SHIFT;
hl_debugfs_add_cb(cb);

8
drivers/misc/habanalabs/common/device.c
View File

@ -123,9 +123,13 @@ static int hl_device_release_ctrl(struct inode *inode, struct file *filp)
static int hl_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct hl_fpriv *hpriv = filp->private_data;
unsigned long vm_pgoff;
if ((vma->vm_pgoff & HL_MMAP_CB_MASK) == HL_MMAP_CB_MASK) {
vma->vm_pgoff ^= HL_MMAP_CB_MASK;
vm_pgoff = vma->vm_pgoff;
vma->vm_pgoff = HL_MMAP_OFFSET_VALUE_GET(vm_pgoff);
switch (vm_pgoff & HL_MMAP_TYPE_MASK) {
case HL_MMAP_TYPE_CB:
return hl_cb_mmap(hpriv, vma);
}

14
drivers/misc/habanalabs/common/habanalabs.h
View File

@ -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