Re: [PATCH v2] bus: mhi: host: don't free bhie tables during suspend/hibernation

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Apr 10, 2025 at 07:56:54PM +0500, Muhammad Usama Anjum wrote:
> Fix dma_direct_alloc() failure at resume time during bhie_table
> allocation. There is a crash report where at resume time, the memory
> from the dma doesn't get allocated and MHI fails to re-initialize.
> There may be fragmentation of some kind which fails the allocation
> call.
> 
> To fix it, don't free the memory at power down during suspend /
> hibernation. Instead, use the same allocated memory again after every
> resume / hibernation. This patch has been tested with resume and
> hibernation both.
> 
> The rddm is of constant size for a given hardware. While the fbc_image
> size depends on the firmware. If the firmware changes, we'll free and
> allocate new memory for it.
> 
> Here are the crash logs:
> 
> [ 3029.338587] mhi mhi0: Requested to power ON
> [ 3029.338621] mhi mhi0: Power on setup success
> [ 3029.668654] kworker/u33:8: page allocation failure: order:7, mode:0xc04(GFP_NOIO|GFP_DMA32), nodemask=(null),cpuset=/,mems_allowed=0
> [ 3029.668682] CPU: 4 UID: 0 PID: 2744 Comm: kworker/u33:8 Not tainted 6.11.11-valve10-1-neptune-611-gb69e902b4338 #1ed779c892334112fb968aaa3facf9686b5ff0bd7
> [ 3029.668690] Hardware name: Valve Galileo/Galileo, BIOS F7G0112 08/01/2024
> [ 3029.668694] Workqueue: mhi_hiprio_wq mhi_pm_st_worker [mhi]
> [ 3029.668717] Call Trace:
> [ 3029.668722]  <TASK>
> [ 3029.668728]  dump_stack_lvl+0x4e/0x70
> [ 3029.668738]  warn_alloc+0x164/0x190
> [ 3029.668747]  ? srso_return_thunk+0x5/0x5f
> [ 3029.668754]  ? __alloc_pages_direct_compact+0xaf/0x360
> [ 3029.668761]  __alloc_pages_slowpath.constprop.0+0xc75/0xd70
> [ 3029.668774]  __alloc_pages_noprof+0x321/0x350
> [ 3029.668782]  __dma_direct_alloc_pages.isra.0+0x14a/0x290
> [ 3029.668790]  dma_direct_alloc+0x70/0x270
> [ 3029.668796]  mhi_alloc_bhie_table+0xe8/0x190 [mhi faa917c5aa23a5f5b12d6a2c597067e16d2fedc0]
> [ 3029.668814]  mhi_fw_load_handler+0x1bc/0x310 [mhi faa917c5aa23a5f5b12d6a2c597067e16d2fedc0]
> [ 3029.668830]  mhi_pm_st_worker+0x5c8/0xaa0 [mhi faa917c5aa23a5f5b12d6a2c597067e16d2fedc0]
> [ 3029.668844]  ? srso_return_thunk+0x5/0x5f
> [ 3029.668853]  process_one_work+0x17e/0x330
> [ 3029.668861]  worker_thread+0x2ce/0x3f0
> [ 3029.668868]  ? __pfx_worker_thread+0x10/0x10
> [ 3029.668873]  kthread+0xd2/0x100
> [ 3029.668879]  ? __pfx_kthread+0x10/0x10
> [ 3029.668885]  ret_from_fork+0x34/0x50
> [ 3029.668892]  ? __pfx_kthread+0x10/0x10
> [ 3029.668898]  ret_from_fork_asm+0x1a/0x30
> [ 3029.668910]  </TASK>
> 
> Tested-on: QCNFA765 WLAN.HSP.1.1-03926.13-QCAHSPSWPL_V2_SILICONZ_CE-2.52297.6
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
> ---
> Changes sice v1:
> - Don't free bhie tables during suspend/hibernation only
> - Handle fbc_image changed size correctly
> - Remove fbc_image getting set to NULL in *free_bhie_table()

What commit id does this fix?

thanks,

greg k-h