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Date: Wed, 6 Apr 2022 10:58:42 +0000
From: Peng Fan <peng.fan@....com>
To: Daniel Baluta <daniel.baluta@...il.com>,
"Peng Fan (OSS)" <peng.fan@....nxp.com>
CC: "bjorn.andersson@...aro.org" <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-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>
Subject: RE: [PATCH 2/2] remoteproc: imx_dsp_rproc: use common
rproc_elf_load_segments
> 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.
I think when generating elf file, the sections needs to be 32/64bits aligned.
Regards,
Peng.
>
> > ---
> > 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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