On Mon, Jul 22, 2024 at 11:24:37AM +0530, Ekansh Gupta wrote:
> For unsigned PD offloading requirement, additional memory is required
> because of additional static heap initialization. Without this
> additional memory, PD initialization would fail. Increase the initmem
> size by 2MB for unsigned PD initmem buffer allocation. Any additional
> memory sent to DSP during PD init is used as the PD heap.
>
> Fixes: 7f1f481263c3 ("misc: fastrpc: check before loading process to the DSP")
> Cc: stable <stable@xxxxxxxxxx>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@xxxxxxxxxxx>
> ---
> drivers/misc/fastrpc.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index a3a5b745936e..18668b020a87 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -40,6 +40,7 @@
> #define FASTRPC_CTXID_MASK (0xFF0)
> #define INIT_FILELEN_MAX (2 * 1024 * 1024)
> #define FASTRPC_INITLEN_MIN (3 * 1024 * 1024)
> +#define FASTRPC_STATIC_HEAP_LEN (2 * 1024 * 1024)
> #define INIT_FILE_NAMELEN_MAX (128)
> #define FASTRPC_DEVICE_NAME "fastrpc"
>
> @@ -1411,8 +1412,14 @@ static int fastrpc_init_create_process(struct fastrpc_user *fl,
> goto err;
> }
>
> + /* Allocate buffer in kernel for donating to remote process.
> + * Unsigned PD requires additional memory because of the
What is "PD"?
> + * additional static heap initialized within the process.
> + */
Why are you using networking comment style for a non-networking file?
> memlen = ALIGN(max(FASTRPC_INITLEN_MIN, (int)init.filelen * 4),
> 1024 * 1024);
> + if (unsigned_module)
> + memlen += FASTRPC_STATIC_HEAP_LEN;
I don't understand, why is "static heap length" being added for
something that is "unsigned"? Why isn't this just "SIGNING FREE SPACE"
or something like that?
thanks,
greg "naming is hard" k-h
