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Date: Wed, 6 Apr 2022 13:05:16 +0300
From: Daniel Baluta <daniel.baluta@...il.com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: bjorn.andersson@...aro.org,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
"S.j. Wang" <shengjiu.wang@....com>,
linux-remoteproc@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
dl-linux-imx <linux-imx@....com>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 2/2] remoteproc: imx_dsp_rproc: use common rproc_elf_load_segments
On Thu, Mar 24, 2022 at 1:34 AM Peng Fan (OSS) <peng.fan@....nxp.com> wrote:
>
> From: Peng Fan <peng.fan@....com>
>
> remoteproc elf loader supports the specific case that segments
> have PT_LOAD and memsz/filesz set to zero, so no duplicate
> code.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
I think this change OK, but we have a case with the DSP were
reads/writes should be done in multiples of 32/64.
We need a way to provide our own "memcpy" function to be used by
rproc_elf_load_segments.
> ---
> drivers/remoteproc/imx_dsp_rproc.c | 95 +-----------------------------
> 1 file changed, 1 insertion(+), 94 deletions(-)
>
> diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> index 2abee78df96e..eee3c44c2146 100644
> --- a/drivers/remoteproc/imx_dsp_rproc.c
> +++ b/drivers/remoteproc/imx_dsp_rproc.c
> @@ -649,99 +649,6 @@ static int imx_dsp_rproc_add_carveout(struct imx_dsp_rproc *priv)
> return 0;
> }
>
> -/**
> - * imx_dsp_rproc_elf_load_segments() - load firmware segments to memory
> - * @rproc: remote processor which will be booted using these fw segments
> - * @fw: the ELF firmware image
> - *
> - * This function specially checks if memsz is zero or not, otherwise it
> - * is mostly same as rproc_elf_load_segments().
> - */
> -static int imx_dsp_rproc_elf_load_segments(struct rproc *rproc,
> - const struct firmware *fw)
> -{
> - struct device *dev = &rproc->dev;
> - u8 class = fw_elf_get_class(fw);
> - u32 elf_phdr_get_size = elf_size_of_phdr(class);
> - const u8 *elf_data = fw->data;
> - const void *ehdr, *phdr;
> - int i, ret = 0;
> - u16 phnum;
> -
> - ehdr = elf_data;
> - phnum = elf_hdr_get_e_phnum(class, ehdr);
> - phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr);
> -
> - /* go through the available ELF segments */
> - for (i = 0; i < phnum; i++, phdr += elf_phdr_get_size) {
> - u64 da = elf_phdr_get_p_paddr(class, phdr);
> - u64 memsz = elf_phdr_get_p_memsz(class, phdr);
> - u64 filesz = elf_phdr_get_p_filesz(class, phdr);
> - u64 offset = elf_phdr_get_p_offset(class, phdr);
> - u32 type = elf_phdr_get_p_type(class, phdr);
> - void *ptr;
> -
> - /*
> - * There is a case that with PT_LOAD type, the
> - * filesz = memsz = 0. If memsz = 0, rproc_da_to_va
> - * should return NULL ptr, then error is returned.
> - * So this case should be skipped from the loop.
> - * Add !memsz checking here.
> - */
> - if (type != PT_LOAD || !memsz)
> - continue;
> -
> - dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n",
> - type, da, memsz, filesz);
> -
> - if (filesz > memsz) {
> - dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n",
> - filesz, memsz);
> - ret = -EINVAL;
> - break;
> - }
> -
> - if (offset + filesz > fw->size) {
> - dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n",
> - offset + filesz, fw->size);
> - ret = -EINVAL;
> - break;
> - }
> -
> - if (!rproc_u64_fit_in_size_t(memsz)) {
> - dev_err(dev, "size (%llx) does not fit in size_t type\n",
> - memsz);
> - ret = -EOVERFLOW;
> - break;
> - }
> -
> - /* grab the kernel address for this device address */
> - ptr = rproc_da_to_va(rproc, da, memsz, NULL);
> - if (!ptr) {
> - dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da,
> - memsz);
> - ret = -EINVAL;
> - break;
> - }
> -
> - /* put the segment where the remote processor expects it */
> - if (filesz)
> - memcpy(ptr, elf_data + offset, filesz);
> -
> - /*
> - * Zero out remaining memory for this segment.
> - *
> - * This isn't strictly required since dma_alloc_coherent already
> - * did this for us. albeit harmless, we may consider removing
> - * this.
> - */
> - if (memsz > filesz)
> - memset(ptr + filesz, 0, memsz - filesz);
> - }
> -
> - return ret;
> -}
> -
> /* Prepare function for rproc_ops */
> static int imx_dsp_rproc_prepare(struct rproc *rproc)
> {
> @@ -808,7 +715,7 @@ static const struct rproc_ops imx_dsp_rproc_ops = {
> .start = imx_dsp_rproc_start,
> .stop = imx_dsp_rproc_stop,
> .kick = imx_dsp_rproc_kick,
> - .load = imx_dsp_rproc_elf_load_segments,
> + .load = rproc_elf_load_segments,
> .parse_fw = rproc_elf_load_rsc_table,
> .sanity_check = rproc_elf_sanity_check,
> .get_boot_addr = rproc_elf_get_boot_addr,
> --
> 2.25.1
>
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