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authorShin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>2024-08-10 06:27:01 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2024-08-13 02:51:37 +0200
commit8c6b808c8c2a9de21503944bd6308979410fd812 (patch)
tree6b0235ce858fd8550951ee38cf2a995515a7ad5d /drivers/scsi
parentscsi: mpi3mr: Add missing spin_lock_init() for mrioc->trigger_lock (diff)
downloadlinux-8c6b808c8c2a9de21503944bd6308979410fd812.tar.xz
linux-8c6b808c8c2a9de21503944bd6308979410fd812.zip
scsi: mpi3mr: Avoid MAX_PAGE_ORDER WARNING for buffer allocations
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@wdc.com> Link: https://lore.kernel.org/r/20240810042701.661841-3-shinichiro.kawasaki@wdc.com Acked-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/mpi3mr/mpi3mr_app.c11
1 files 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 @@ retry_trace:
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 @@ retry_fw:
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",