Re: [PATCH] remoteproc: elf_loader: fix loading segment when is_iomem true

[kernel test robot <lkp@intel.com>]

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Hi "Peng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on soc/for-next]
[also build test WARNING on linus/master v5.13 next-20210628]
[cannot apply to xlnx/master remoteproc/for-next rpmsg/for-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peng-Fan-OSS/remoteproc-elf_loader-fix-loading-segment-when-is_iomem-true/20210628-143358
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: i386-randconfig-s002-20210628 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/2c90d7d15776bf485ad028de63002efbc2facc66
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peng-Fan-OSS/remoteproc-elf_loader-fix-loading-segment-when-is_iomem-true/20210628-143358
        git checkout 2c90d7d15776bf485ad028de63002efbc2facc66
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/remoteproc/remoteproc_elf_loader.c:219:45: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void volatile [noderef] __iomem * @@     got void *[assigned] ptr @@
   drivers/remoteproc/remoteproc_elf_loader.c:219:45: sparse:     expected void volatile [noderef] __iomem *
   drivers/remoteproc/remoteproc_elf_loader.c:219:45: sparse:     got void *[assigned] ptr
>> drivers/remoteproc/remoteproc_elf_loader.c:219:51: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const * @@     got void [noderef] __iomem * @@
   drivers/remoteproc/remoteproc_elf_loader.c:219:51: sparse:     expected void const *
   drivers/remoteproc/remoteproc_elf_loader.c:219:51: sparse:     got void [noderef] __iomem *

vim +219 drivers/remoteproc/remoteproc_elf_loader.c

   131	
   132	/**
   133	 * rproc_elf_load_segments() - load firmware segments to memory
   134	 * @rproc: remote processor which will be booted using these fw segments
   135	 * @fw: the ELF firmware image
   136	 *
   137	 * This function loads the firmware segments to memory, where the remote
   138	 * processor expects them.
   139	 *
   140	 * Some remote processors will expect their code and data to be placed
   141	 * in specific device addresses, and can't have them dynamically assigned.
   142	 *
   143	 * We currently support only those kind of remote processors, and expect
   144	 * the program header's paddr member to contain those addresses. We then go
   145	 * through the physically contiguous "carveout" memory regions which we
   146	 * allocated (and mapped) earlier on behalf of the remote processor,
   147	 * and "translate" device address to kernel addresses, so we can copy the
   148	 * segments where they are expected.
   149	 *
   150	 * Currently we only support remote processors that required carveout
   151	 * allocations and got them mapped onto their iommus. Some processors
   152	 * might be different: they might not have iommus, and would prefer to
   153	 * directly allocate memory for every segment/resource. This is not yet
   154	 * supported, though.
   155	 */
   156	int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
   157	{
   158		struct device *dev = &rproc->dev;
   159		const void *ehdr, *phdr;
   160		int i, ret = 0;
   161		u16 phnum;
   162		const u8 *elf_data = fw->data;
   163		u8 class = fw_elf_get_class(fw);
   164		u32 elf_phdr_get_size = elf_size_of_phdr(class);
   165	
   166		ehdr = elf_data;
   167		phnum = elf_hdr_get_e_phnum(class, ehdr);
   168		phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr);
   169	
   170		/* go through the available ELF segments */
   171		for (i = 0; i < phnum; i++, phdr += elf_phdr_get_size) {
   172			u64 da = elf_phdr_get_p_paddr(class, phdr);
   173			u64 memsz = elf_phdr_get_p_memsz(class, phdr);
   174			u64 filesz = elf_phdr_get_p_filesz(class, phdr);
   175			u64 offset = elf_phdr_get_p_offset(class, phdr);
   176			u32 type = elf_phdr_get_p_type(class, phdr);
   177			void *ptr;
   178			bool is_iomem;
   179	
   180			if (type != PT_LOAD)
   181				continue;
   182	
   183			dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n",
   184				type, da, memsz, filesz);
   185	
   186			if (filesz > memsz) {
   187				dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n",
   188					filesz, memsz);
   189				ret = -EINVAL;
   190				break;
   191			}
   192	
   193			if (offset + filesz > fw->size) {
   194				dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n",
   195					offset + filesz, fw->size);
   196				ret = -EINVAL;
   197				break;
   198			}
   199	
   200			if (!rproc_u64_fit_in_size_t(memsz)) {
   201				dev_err(dev, "size (%llx) does not fit in size_t type\n",
   202					memsz);
   203				ret = -EOVERFLOW;
   204				break;
   205			}
   206	
   207			/* grab the kernel address for this device address */
   208			ptr = rproc_da_to_va(rproc, da, memsz, &is_iomem);
   209			if (!ptr) {
   210				dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da,
   211					memsz);
   212				ret = -EINVAL;
   213				break;
   214			}
   215	
   216			/* put the segment where the remote processor expects it */
   217			if (filesz) {
   218				if (is_iomem)
 > 219					memcpy_toio(ptr, (void __iomem *)(elf_data + offset), filesz);
   220				else
   221					memcpy(ptr, elf_data + offset, filesz);
   222			}
   223	
   224			/*
   225			 * Zero out remaining memory for this segment.
   226			 *
   227			 * This isn't strictly required since dma_alloc_coherent already
   228			 * did this for us. albeit harmless, we may consider removing
   229			 * this.
   230			 */
   231			if (memsz > filesz) {
   232				if (is_iomem)
   233					memset_io((void __iomem *)(ptr + filesz), 0, memsz - filesz);
   234				else
   235					memset(ptr + filesz, 0, memsz - filesz);
   236			}
   237		}
   238	
   239		return ret;
   240	}
   241	EXPORT_SYMBOL(rproc_elf_load_segments);
   242	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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