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habanalabs: add prefetch flag to the MAP operation

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This patch let the user decide whether the translations done in the
page tables will be fetched directly to the STLB right after the map.

We want to let the user control whether to perform prefetch upon map
operation.

To do so a memory flag was added, to be used in the MAP ioctl, called
HL_MEM_PREFETCH and if set- the mappings will be fetched directly to
the STLB after map operation.

Signed-off-by: Ohad Sharabi <osharabi@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ohad Sharabi 2022-04-10 11:19:42 +03:00 committed by Greg Kroah-Hartman
parent 77c97a7ea8
commit 5d1a0de2c7
2 changed files with 7 additions and 5 deletions
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11
drivers/misc/habanalabs/common/memory.c
View file

@ -1250,11 +1250,12 @@ static int map_device_va(struct hl_ctx *ctx, struct hl_mem_in *args,
if (rc)
goto map_err;
/* already prefetch the relevant translations to the cache */
rc = hl_mmu_prefetch_cache_range(hdev, *vm_type, ctx->asid, ret_vaddr,
phys_pg_pack->total_size);
if (rc)
goto map_err;
if (args->flags & HL_MEM_PREFETCH) {
rc = hl_mmu_prefetch_cache_range(hdev, *vm_type, ctx->asid, ret_vaddr,
phys_pg_pack->total_size);
if (rc)
goto map_err;
}
mutex_unlock(&ctx->mmu_lock);

1
include/uapi/misc/habanalabs.h
View file

@ -1134,6 +1134,7 @@ union hl_wait_cs_args {
#define HL_MEM_SHARED 0x2
#define HL_MEM_USERPTR 0x4
#define HL_MEM_FORCE_HINT 0x8
#define HL_MEM_PREFETCH 0x40
/**
* structure hl_mem_in - structure that handle input args for memory IOCTL