diff options
| author | farah kassabri <fkassabri@habana.ai> | 2021-03-11 12:24:57 +0300 |
|---|---|---|
| committer | Oded Gabbay <ogabbay@kernel.org> | 2021-04-09 14:09:24 +0300 |
| commit | 2f6274e4773570ab763d5a588504ff35b908b2cf (patch) | |
| tree | c2774370c87bcf4e452855e2bc7c70f105b72e63 /drivers/misc | |
| parent | d661d79930b41d3103c0cc959757deec4421e8ff (diff) | |
| download | linux-2f6274e4773570ab763d5a588504ff35b908b2cf.tar.xz | |
habanalabs: avoid soft lockup bug upon mapping error
Add a little sleep between page unmappings in case mapping of
large number of host pages failed, in order to
avoid soft lockup bug during the rollback.
Signed-off-by: farah kassabri <fkassabri@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/habanalabs/common/memory.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c index 1b69573369cf..6530fddbbc21 100644 --- a/drivers/misc/habanalabs/common/memory.c +++ b/drivers/misc/habanalabs/common/memory.c @@ -857,6 +857,7 @@ static int map_phys_pg_pack(struct hl_ctx *ctx, u64 vaddr, u64 next_vaddr = vaddr, paddr, mapped_pg_cnt = 0, i; u32 page_size = phys_pg_pack->page_size; int rc = 0; + bool is_host_addr; for (i = 0 ; i < phys_pg_pack->npages ; i++) { paddr = phys_pg_pack->pages[i]; @@ -878,6 +879,8 @@ static int map_phys_pg_pack(struct hl_ctx *ctx, u64 vaddr, return 0; err: + is_host_addr = !hl_is_dram_va(hdev, vaddr); + next_vaddr = vaddr; for (i = 0 ; i < mapped_pg_cnt ; i++) { if (hl_mmu_unmap_page(ctx, next_vaddr, page_size, @@ -888,6 +891,17 @@ err: phys_pg_pack->pages[i], page_size); next_vaddr += page_size; + + /* + * unmapping on Palladium can be really long, so avoid a CPU + * soft lockup bug by sleeping a little between unmapping pages + * + * In addition, on host num of pages could be huge, + * because page size could be 4KB, so when unmapping host + * pages sleep every 32K pages to avoid soft lockup + */ + if (hdev->pldm || (is_host_addr && (i & 0x7FFF) == 0)) + usleep_range(50, 200); } return rc; @@ -921,9 +935,9 @@ static void unmap_phys_pg_pack(struct hl_ctx *ctx, u64 vaddr, * unmapping on Palladium can be really long, so avoid a CPU * soft lockup bug by sleeping a little between unmapping pages * - * In addition, when unmapping host memory we pass through - * the Linux kernel to unpin the pages and that takes a long - * time. Therefore, sleep every 32K pages to avoid soft lockup + * In addition, on host num of pages could be huge, + * because page size could be 4KB, so when unmapping host + * pages sleep every 32K pages to avoid soft lockup */ if (hdev->pldm || (is_host_addr && (i & 0x7FFF) == 0)) usleep_range(50, 200); |