On Fri, Aug 9, 2024 at 10:27 PM Shin'ichiro Kawasaki
<shinichiro.kawasaki@xxxxxxx> wrote:
>
> Commit fc4444941140 ("scsi: mpi3mr: HDB allocation and posting for
> hardware and firmware buffers") added mpi3mr_alloc_diag_bufs() which
> calls dma_alloc_coherent() to allocate the trace buffer and the firmware
> buffer. mpi3mr_alloc_diag_bufs() decides the buffer sizes from the
> driver configuration. In my environment, the sizes are 8MB. With the
> sizes, dma_alloc_coherent() fails and report this WARNING:
>
> WARNING: CPU: 4 PID: 438 at mm/page_alloc.c:4676 __alloc_pages_noprof+0x52f/0x640
>
> The WARNING indicates that the order of the allocation size is larger
> than MAX_PAGE_ORDER. After this failure, mpi3mr_alloc_diag_bufs()
> reduces the buffer sizes and retries dma_alloc_coherent(). In the end,
> the buffer allocations succeed with 4MB size in my environment, which
> corresponds to MAX_PAGE_ORDER=10. Though the allocations succeed, the
> WARNING message is misleading and should be avoided.
>
> To avoid the WARNING, check the orders of the buffer allocation sizes
> before calling dma_alloc_coherent(). If the orders are larger than
> MAX_PAGE_ORDER, fall back to the retry path.
>
> Fixes: fc4444941140 ("scsi: mpi3mr: HDB allocation and posting for hardware and firmware buffers")
> Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
> ---
Acked-by: Sathya Prakash Veerichetty <sathya.prakash@xxxxxxxxxxxx>
> drivers/scsi/mpi3mr/mpi3mr_app.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/scsi/mpi3mr/mpi3mr_app.c b/drivers/scsi/mpi3mr/mpi3mr_app.c
> index 8b0eded6ef36..01f035f9330e 100644
> --- a/drivers/scsi/mpi3mr/mpi3mr_app.c
> +++ b/drivers/scsi/mpi3mr/mpi3mr_app.c
> @@ -100,7 +100,8 @@ void mpi3mr_alloc_diag_bufs(struct mpi3mr_ioc *mrioc)
> dprint_init(mrioc,
> "trying to allocate trace diag buffer of size = %dKB\n",
> trace_size / 1024);
> - if (mpi3mr_alloc_trace_buffer(mrioc, trace_size)) {
> + if (get_order(trace_size) > MAX_PAGE_ORDER ||
> + mpi3mr_alloc_trace_buffer(mrioc, trace_size)) {
> retry = true;
> trace_size -= trace_dec_size;
> dprint_init(mrioc, "trace diag buffer allocation failed\n"
> @@ -118,8 +119,12 @@ void mpi3mr_alloc_diag_bufs(struct mpi3mr_ioc *mrioc)
> diag_buffer->type = MPI3_DIAG_BUFFER_TYPE_FW;
> diag_buffer->status = MPI3MR_HDB_BUFSTATUS_NOT_ALLOCATED;
> if ((mrioc->facts.diag_fw_sz < fw_size) && (fw_size >= fw_min_size)) {
> - diag_buffer->addr = dma_alloc_coherent(&mrioc->pdev->dev,
> - fw_size, &diag_buffer->dma_addr, GFP_KERNEL);
> + if (get_order(fw_size) <= MAX_PAGE_ORDER) {
> + diag_buffer->addr
> + = dma_alloc_coherent(&mrioc->pdev->dev, fw_size,
> + &diag_buffer->dma_addr,
> + GFP_KERNEL);
> + }
> if (!retry)
> dprint_init(mrioc,
> "%s:trying to allocate firmware diag buffer of size = %dKB\n",
> --
> 2.45.2
>
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