On Fri, Jul 24, 2020 at 04:08:09PM +0800, Peng Fan wrote: > To i.MX8, we not able to see the correct data written into TCM when > using ioremap_wc, so use ioremap. > > However common elf loader using memset. > > To arm64, "dc zva, dst" is used in memset. > Per ARM DDI 0487A.j, chapter C5.3.8 DC ZVA, Data Cache Zero by VA, > > "If the memory region being zeroed is any type of Device memory, > this instruction can give an alignment fault which is prioritized > in the same way as other alignment faults that are determined > by the memory type." > > On i.MX platforms, when elf is loaded to onchip TCM area, the region > is ioremapped, so "dc zva, dst" will trigger abort. > > So add i.MX specific loader to address the TCM write issue. First I wonted to ask, if it is AMR64 related issues, why do we handle it in iMX specific driver? But after searching and finding this thread: https://lkml.org/lkml/2020/4/18/93 it looks to me like most of related maintainer questions, was not answered. > The change not impact i.MX6/7 function. Hm... it is impossible assumption,e except you was able to test all firmware variants it the wild. You changed behavior of ELF parser in the first place. It means, not iMX6/7 is affected, but firmware used on this platforms. > Signed-off-by: Peng Fan <peng.fan@xxxxxxx> > --- > drivers/remoteproc/imx_rproc.c | 76 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 76 insertions(+) > > diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c > index aee790efbf7b..c23726091228 100644 > --- a/drivers/remoteproc/imx_rproc.c > +++ b/drivers/remoteproc/imx_rproc.c > @@ -4,6 +4,7 @@ > */ > > #include <linux/clk.h> > +#include <linux/elf.h> > #include <linux/err.h> > #include <linux/interrupt.h> > #include <linux/kernel.h> > @@ -15,6 +16,9 @@ > #include <linux/regmap.h> > #include <linux/remoteproc.h> > > +#include "remoteproc_internal.h" > +#include "remoteproc_elf_helpers.h" > + > #define IMX7D_SRC_SCR 0x0C > #define IMX7D_ENABLE_M4 BIT(3) > #define IMX7D_SW_M4P_RST BIT(2) > @@ -247,10 +251,82 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, size_t len) > return va; > } > > +static int imx_rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw) > +{ > + struct device *dev = &rproc->dev; > + const void *ehdr, *phdr; > + int i, ret = 0; > + u16 phnum; > + const u8 *elf_data = fw->data; > + u8 class = fw_elf_get_class(fw); > + u32 elf_phdr_get_size = elf_size_of_phdr(class); > + > + 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; > + > + if (type != PT_LOAD) > + 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); > + 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_toio(ptr, elf_data + offset, filesz); > + } > + > + return ret; > +} > + > static const struct rproc_ops imx_rproc_ops = { > .start = imx_rproc_start, > .stop = imx_rproc_stop, > .da_to_va = imx_rproc_da_to_va, > + .load = imx_rproc_elf_load_segments, > + .parse_fw = rproc_elf_load_rsc_table, > + .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table, > + .sanity_check = rproc_elf_sanity_check, > + .get_boot_addr = rproc_elf_get_boot_addr, > }; > > static int imx_rproc_addr_init(struct imx_rproc *priv, > -- > 2.16.4 > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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