linux-kernel - Re: [PATCH v1] misc: fastrpc: Fix remote heap allocation request

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Date:   Fri, 23 Jun 2023 19:17:30 +0530
From:   Ekansh Gupta <quic_ekangupt@...cinc.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        <linux-arm-msm@...r.kernel.org>
CC:     <ekangupt@....qualcomm.com>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <bkumar@....qualcomm.com>,
        <fastrpc.upstream@....qualcomm.com>, stable <stable@...nel.org>
Subject: Re: [PATCH v1] misc: fastrpc: Fix remote heap allocation request



On 6/12/2023 5:34 PM, Srinivas Kandagatla wrote:
> 
> 
> On 05/06/2023 15:11, Ekansh Gupta wrote:
>> Remote heap is used by DSP audioPD on need basis. This memory is
>> allocated from reserved CMA memory region and is then shared with
>> audioPD to use it for it's functionality.
>>
>> Current implementation of remote heap is not allocating the memory
>> from CMA region, instead it is allocating the memory from SMMU
>> context bank. The arguments passed to scm call for the reassignment
>> of ownership is also not correct. Added changes to allocate CMA
>> memory and have a proper ownership reassignment.
>>
>> Fixes: 532ad70c6d44 ("misc: fastrpc: Add mmap request assigning for 
>> static PD pool")
>> Cc: stable <stable@...nel.org>
>> Tested-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
>> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
>> ---
>>   drivers/misc/fastrpc.c | 26 ++++++++++++++++++++------
>>   1 file changed, 20 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
>> index 30d4d04..f5fc2de 100644
>> --- a/drivers/misc/fastrpc.c
>> +++ b/drivers/misc/fastrpc.c
>> @@ -1866,7 +1866,11 @@ static int fastrpc_req_mmap(struct fastrpc_user 
>> *fl, char __user *argp)
>>           return -EINVAL;
>>       }
>> -    err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
>> +    if (req.flags == ADSP_MMAP_REMOTE_HEAP_ADDR)
>> +        err = fastrpc_remote_heap_alloc(fl, dev, req.size, &buf);
>> +    else
>> +        err = fastrpc_buf_alloc(fl, dev, req.size, &buf);
>> +
>>       if (err) {
>>           dev_err(dev, "failed to allocate buffer\n");
>>           return err;
>> @@ -1905,12 +1909,22 @@ static int fastrpc_req_mmap(struct 
>> fastrpc_user *fl, char __user *argp)
>>       /* Add memory to static PD pool, protection thru hypervisor */
>>       if (req.flags == ADSP_MMAP_REMOTE_HEAP_ADDR && fl->cctx->vmcount) {
>> -        struct qcom_scm_vmperm perm;
>> +        u64 src_perms = BIT(QCOM_SCM_VMID_HLOS);
>> +        struct qcom_scm_vmperm *dst_perms;
>> +        u32 i;
>> -        perm.vmid = QCOM_SCM_VMID_HLOS;
>> -        perm.perm = QCOM_SCM_PERM_RWX;
>> -        err = qcom_scm_assign_mem(buf->phys, buf->size,
>> -            &fl->cctx->perms, &perm, 1);
>> +        dst_perms = kcalloc(fl->cctx->vmcount,
>> +            sizeof(struct qcom_scm_vmperm), GFP_KERNEL);
>> +        if (!dst_perms)
>> +            return -ENOMEM;
>> +        for (i = 0; i < fl->cctx->vmcount; i++) {
>> +            dst_perms[i].vmid = fl->cctx->vmperms[i].vmid;
>> +            dst_perms[i].perm = fl->cctx->vmperms[i].perm;
>> +        }
>> +
> Why not use fl->cctx->vmperms instead of allocating a new dst_perms?
> 
> --srini
> 
Thanks Srini for your comments. I'll address them in next patch.
>> +        err = qcom_scm_assign_mem(buf->phys,(u64)buf->size,
>> +            &src_perms, dst_perms, fl->cctx->vmcount);
>> +        kfree(dst_perms);
>>           if (err) {
>>               dev_err(fl->sctx->dev, "Failed to assign memory phys 
>> 0x%llx size 0x%llx err %d",
>>                       buf->phys, buf->size, err);