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Message-ID: <81343778-6d5c-db85-29e3-8fcba0ec2e8a@linaro.org>
Date: Mon, 12 Jun 2023 13:04:07 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>,
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 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
> + 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);
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