linux-kernel - Re: [PATCH V1] accel/amdxdna: Fix incorrect PSP firmware size

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Message-ID: <e70bdb30-66cc-7e9e-b666-efff3203bf27@amd.com>
Date: Wed, 4 Jun 2025 17:12:47 -0700
From: Lizhi Hou <lizhi.hou@....com>
To: Alex Deucher <alexdeucher@...il.com>
CC: <ogabbay@...nel.org>, <quic_jhugo@...cinc.com>,
	<jacek.lawrynowicz@...ux.intel.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <max.zhen@....com>, <min.ma@....com>,
	<sonal.santan@....com>, <mario.limonciello@....com>
Subject: Re: [PATCH V1] accel/amdxdna: Fix incorrect PSP firmware size


On 6/4/25 07:51, Alex Deucher wrote:
> On Wed, Jun 4, 2025 at 10:42 AM Lizhi Hou <lizhi.hou@....com> wrote:
>> The incorrect PSP firmware size is used for initializing. It may
>> cause error for newer version firmware.
>>
>> Fixes: 8c9ff1b181ba ("accel/amdxdna: Add a new driver for AMD AI Engine")
>> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
>> ---
>>   drivers/accel/amdxdna/aie2_psp.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/accel/amdxdna/aie2_psp.c b/drivers/accel/amdxdna/aie2_psp.c
>> index dc3a072ce3b6..f28a060a8810 100644
>> --- a/drivers/accel/amdxdna/aie2_psp.c
>> +++ b/drivers/accel/amdxdna/aie2_psp.c
>> @@ -126,8 +126,8 @@ struct psp_device *aie2m_psp_create(struct drm_device *ddev, struct psp_config *
>>          psp->ddev = ddev;
>>          memcpy(psp->psp_regs, conf->psp_regs, sizeof(psp->psp_regs));
>>
>> -       psp->fw_buf_sz = ALIGN(conf->fw_size, PSP_FW_ALIGN) + PSP_FW_ALIGN;
>> -       psp->fw_buffer = drmm_kmalloc(ddev, psp->fw_buf_sz, GFP_KERNEL);
>> +       psp->fw_buf_sz = ALIGN(conf->fw_size, PSP_FW_ALIGN);
>> +       psp->fw_buffer = drmm_kmalloc(ddev, psp->fw_buf_sz + PSP_FW_ALIGN, GFP_KERNEL);
> Why do you need the extra PSP_FW_ALIGN in the allocation?

The start address of the firmware is also required to be PSP_FW_ALIGN 
aligned.


Thanks,

Lizhi

>
> Alex
>
>>          if (!psp->fw_buffer) {
>>                  drm_err(ddev, "no memory for fw buffer");
>>                  return NULL;
>> --
>> 2.34.1
>>