[PATCH] csky: optimize memcpy_{from,to}io() and memset_io()

[PATCH] csky: optimize memcpy_{from,to}io() and memset_io()

[guoren]

From: Guo Ren <guoren@linux.alibaba.com>

Optimize memcpy_{from,to}io() and memset_io() by transferring in
64 bit as much as possible with minimized barrier usage.  This
simplest optimization brings faster throughput compare to current
byte-by-byte read and write with barrier in the loop. Code's
skeleton is taken from the powerpc & arm64.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
---
 arch/csky/include/asm/io.h | 11 +++++
 arch/csky/kernel/io.c      | 91 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 arch/csky/kernel/io.c

diff --git a/arch/csky/include/asm/io.h b/arch/csky/include/asm/io.h
index f82654053dc0..adb64e26194f 100644
--- a/arch/csky/include/asm/io.h
+++ b/arch/csky/include/asm/io.h
@@ -32,6 +32,17 @@
 #define writel(v,c)		({ wmb(); writel_relaxed((v),(c)); mb(); })
 #endif
 
+/*
+ * String version of I/O memory access operations.
+ */
+extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t);
+extern void __memcpy_toio(volatile void __iomem *, const void *, size_t);
+extern void __memset_io(volatile void __iomem *, int, size_t);
+
+#define memset_io(c,v,l)        __memset_io((c),(v),(l))
+#define memcpy_fromio(a,c,l)    __memcpy_fromio((a),(c),(l))
+#define memcpy_toio(c,a,l)      __memcpy_toio((c),(a),(l))
+
 /*
  * I/O memory mapping functions.
  */
diff --git a/arch/csky/kernel/io.c b/arch/csky/kernel/io.c
new file mode 100644
index 000000000000..5883f13fa2b1
--- /dev/null
+++ b/arch/csky/kernel/io.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/export.h>
+#include <linux/types.h>
+#include <linux/io.h>
+
+/*
+ * Copy data from IO memory space to "real" memory space.
+ */
+void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
+{
+	while (count && !IS_ALIGNED((unsigned long)from, 4)) {
+		*(u8 *)to = __raw_readb(from);
+		from++;
+		to++;
+		count--;
+	}
+
+	while (count >= 4) {
+		*(u32 *)to = __raw_readl(from);
+		from += 4;
+		to += 4;
+		count -= 4;
+	}
+
+	while (count) {
+		*(u8 *)to = __raw_readb(from);
+		from++;
+		to++;
+		count--;
+	}
+}
+EXPORT_SYMBOL(__memcpy_fromio);
+
+/*
+ * Copy data from "real" memory space to IO memory space.
+ */
+void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
+{
+	while (count && !IS_ALIGNED((unsigned long)to, 4)) {
+		__raw_writeb(*(u8 *)from, to);
+		from++;
+		to++;
+		count--;
+	}
+
+	while (count >= 4) {
+		__raw_writel(*(u32 *)from, to);
+		from += 4;
+		to += 4;
+		count -= 4;
+	}
+
+	while (count) {
+		__raw_writeb(*(u8 *)from, to);
+		from++;
+		to++;
+		count--;
+	}
+}
+EXPORT_SYMBOL(__memcpy_toio);
+
+/*
+ * "memset" on IO memory space.
+ */
+void __memset_io(volatile void __iomem *dst, int c, size_t count)
+{
+	u32 qc = (u8)c;
+
+	qc |= qc << 8;
+	qc |= qc << 16;
+
+	while (count && !IS_ALIGNED((unsigned long)dst, 4)) {
+		__raw_writeb(c, dst);
+		dst++;
+		count--;
+	}
+
+	while (count >= 4) {
+		__raw_writel(qc, dst);
+		dst += 4;
+		count -= 4;
+	}
+
+	while (count) {
+		__raw_writeb(c, dst);
+		dst++;
+		count--;
+	}
+}
+EXPORT_SYMBOL(__memset_io);
-- 
2.25.1

Re: [PATCH] csky: optimize memcpy_{from,to}io() and memset_io()

[kernel test robot]

Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on soc/for-next]
[also build test ERROR on linus/master linux/master v5.18-rc1 next-20220405]
[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/intel-lab-lkp/linux/commits/guoren-kernel-org/csky-optimize-memcpy_-from-to-io-and-memset_io/20220404-224954
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: csky-randconfig-r034-20220405 (https://download.01.org/0day-ci/archive/20220405/202204051859.sUrlh86t-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/2e50048555b298851590ec8272100b595b8801f9
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review guoren-kernel-org/csky-optimize-memcpy_-from-to-io-and-memset_io/20220404-224954
        git checkout 2e50048555b298851590ec8272100b595b8801f9
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=csky SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   csky-linux-ld: drivers/bus/mhi/core/init.o: in function `mhi_prepare_for_power_up':
>> init.c:(.text+0xfaa): undefined reference to `__memset_io'
>> csky-linux-ld: init.c:(.text+0x1028): undefined reference to `__memset_io'
   csky-linux-ld: drivers/pci/pci-sysfs.o: in function `pci_read_rom':
   pci-sysfs.c:(.text+0x3a6): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/pci/pci-sysfs.o: in function `pci_write_config':
   pci-sysfs.c:(.text+0x534): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/pci/switch/switchtec.o: in function `io_string_show':
   switchtec.c:(.text+0x7a2): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/pci/switch/switchtec.o: in function `vendor_id_show':
   switchtec.c:(.text+0x89c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/pci/switch/switchtec.o: in function `mrpc_cmd_submit.part.0':
   switchtec.c:(.text+0x1c64): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/pci/switch/switchtec.o: in function `switchtec_dev_write':
   switchtec.c:(.text+0x1dbc): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/pci/switch/switchtec.o: in function `mrpc_complete_cmd':
   switchtec.c:(.text+0x1f78): undefined reference to `__memcpy_fromio'
   csky-linux-ld: switchtec.c:(.text+0x1f8c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/soc/fsl/dpaa2-console.o: in function `dpaa2_console_read':
   dpaa2-console.c:(.text+0xd8): undefined reference to `__memcpy_fromio'
   csky-linux-ld: dpaa2-console.c:(.text+0x112): undefined reference to `__memcpy_fromio'
   csky-linux-ld: dpaa2-console.c:(.text+0x1b0): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/sram.o: in function `sram_write':
   sram.c:(.text+0xa8): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/misc/sram.o: in function `sram_read':
   sram.c:(.text+0xe8): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/sram.o: in function `kmalloc_array.constprop.0':
   sram.c:(.text+0x15c): undefined reference to `__memcpy_toio'
   csky-linux-ld: sram.c:(.text+0x164): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/ntb/test/ntb_tool.o: in function `tool_peer_mw_write':
>> ntb_tool.c:(.text+0xee6): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/ntb/test/ntb_tool.o: in function `tool_peer_mw_read':
   ntb_tool.c:(.text+0xf70): undefined reference to `__memcpy_toio'
>> csky-linux-ld: ntb_tool.c:(.text+0xf7c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/ntb/test/ntb_tool.o: in function `ntb_peer_port_number':
>> ntb_tool.c:(.text+0x1018): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/ntb/test/ntb_perf.o: in function `perf_copy_chunk':
>> ntb_perf.c:(.text+0x20ca): undefined reference to `__memcpy_toio'
>> csky-linux-ld: ntb_perf.c:(.text+0x211c): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/ntb/ntb_transport.o: in function `ntb_memcpy_tx':
>> ntb_transport.c:(.text+0x9ba): undefined reference to `__memcpy_toio'
>> csky-linux-ld: ntb_transport.c:(.text+0xa04): undefined reference to `__memcpy_toio'
   csky-linux-ld: sound/pci/rme96.o: in function `snd_rme96_capture_copy_kernel':
>> rme96.c:(.text+0x74e): undefined reference to `__memcpy_fromio'
   csky-linux-ld: sound/pci/rme96.o: in function `snd_rme96_capture_copy':
   rme96.c:(.text+0x784): undefined reference to `__memcpy_fromio'
   csky-linux-ld: sound/pci/rme96.o: in function `snd_rme96_playback_copy_kernel':
>> rme96.c:(.text+0x87e): undefined reference to `__memcpy_toio'
   csky-linux-ld: sound/pci/rme96.o: in function `snd_rme96_playback_silence':
>> rme96.c:(.text+0x8c6): undefined reference to `__memset_io'
>> csky-linux-ld: rme96.c:(.text+0x8f4): undefined reference to `__memcpy_toio'
>> csky-linux-ld: rme96.c:(.text+0x8fc): undefined reference to `__memset_io'
   csky-linux-ld: sound/soc/fsl/fsl_xcvr.o: in function `irq0_isr':
>> fsl_xcvr.c:(.text+0x52c): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: fsl_xcvr.c:(.text+0x546): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: fsl_xcvr.c:(.text+0x588): undefined reference to `__memset_io'
   csky-linux-ld: fsl_xcvr.c:(.text+0x6a4): undefined reference to `__memcpy_fromio'
   csky-linux-ld: fsl_xcvr.c:(.text+0x6ac): undefined reference to `__memset_io'
   csky-linux-ld: fsl_xcvr.c:(.text+0x6f2): undefined reference to `__memcpy_fromio'
   csky-linux-ld: fsl_xcvr.c:(.text+0x72c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/dma/ti/edma.o: in function `edma_write_slot':
   edma.c:(.text+0x158): undefined reference to `__memcpy_toio'
   csky-linux-ld: edma.c:(.text+0x174): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/dma/ti/edma.o: in function `dma_ccerr_handler':
   edma.c:(.text+0x24c8): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: edma.c:(.text+0x2548): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/tty/serial/jsm/jsm_neo.o: in function `neo_copy_data_from_queue_to_uart':
>> jsm_neo.c:(.text+0x624): undefined reference to `__memcpy_toio'
>> csky-linux-ld: jsm_neo.c:(.text+0x69c): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/tty/serial/jsm/jsm_neo.o: in function `neo_copy_data_from_uart_to_queue':
   jsm_neo.c:(.text+0x8ce): undefined reference to `__memcpy_fromio'
   csky-linux-ld: jsm_neo.c:(.text+0x93a): undefined reference to `__memcpy_fromio'
   csky-linux-ld: jsm_neo.c:(.text+0x960): undefined reference to `__memcpy_fromio'
   csky-linux-ld: jsm_neo.c:(.text+0x9fe): undefined reference to `__memcpy_fromio'
   csky-linux-ld: jsm_neo.c:(.text+0xa94): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o: in function `hl_fw_copy_fw_to_device':
   firmware_if.c:(.text+0x106): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o: in function `usleep_range':
   firmware_if.c:(.text+0x130): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o: in function `hl_fw_static_init_cpu':
   firmware_if.c:(.text+0xafa): undefined reference to `__memcpy_fromio'
   csky-linux-ld: firmware_if.c:(.text+0xb60): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o: in function `hl_fw_read_preboot_status':
   firmware_if.c:(.text+0x2208): undefined reference to `__memcpy_fromio'
   csky-linux-ld: firmware_if.c:(.text+0x2290): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o: in function `hl_fw_dynamic_request_descriptor':
   firmware_if.c:(.text.unlikely+0x530): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o:firmware_if.c:(.text.unlikely+0x628): more undefined references to `__memcpy_fromio' follow
   csky-linux-ld: drivers/misc/habanalabs/common/firmware_if.o: in function `hl_fw_dynamic_send_msg.constprop.0':
   firmware_if.c:(.text.unlikely+0x7dc): undefined reference to `__memcpy_toio'
   csky-linux-ld: firmware_if.c:(.text.unlikely+0x86c): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/misc/habanalabs/goya/goya.o: in function `goya_pqe_write':
   goya.c:(.text+0x3148): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/misc/habanalabs/goya/goya.o: in function `goya_get_dma_desc_list_size':
   goya.c:(.text+0x3240): undefined reference to `__memcpy_toio'
   csky-linux-ld: sound/core/memory.o: in function `copy_to_user_fromio':
   memory.c:(.text+0x6e): undefined reference to `__memcpy_fromio'
   csky-linux-ld: sound/core/memory.o: in function `copy_from_user_toio':
   memory.c:(.text+0x116): undefined reference to `__memcpy_toio'
   csky-linux-ld: memory.c:(.text+0x14c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: memory.c:(.text+0x15c): undefined reference to `__memcpy_toio'
   csky-linux-ld: sound/pci/mixart/mixart_core.o: in function `get_msg.constprop.0':
   mixart_core.c:(.text+0x29c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: mixart_core.c:(.text+0x310): undefined reference to `__memcpy_fromio'
   csky-linux-ld: sound/pci/mixart/mixart_hwdep.o: in function `mixart_dsp_load':
   mixart_hwdep.c:(.text+0x538): undefined reference to `__memcpy_toio'
   csky-linux-ld: mixart_hwdep.c:(.text+0x59c): undefined reference to `__memcpy_toio'
   csky-linux-ld: mixart_hwdep.c:(.text+0x67e): undefined reference to `__memcpy_toio'
   csky-linux-ld: mixart_hwdep.c:(.text+0x710): undefined reference to `__memcpy_toio'
   csky-linux-ld: mixart_hwdep.c:(.text+0x776): undefined reference to `__memcpy_toio'
   csky-linux-ld: sound/pci/mixart/mixart_hwdep.o:mixart_hwdep.c:(.text+0x888): more undefined references to `__memcpy_toio' follow

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

Re: [PATCH] csky: optimize memcpy_{from,to}io() and memset_io()

[kernel test robot]

Hi,

I love your patch! Yet something to improve:

[auto build test ERROR on soc/for-next]
[also build test ERROR on linus/master linux/master v5.18-rc1 next-20220405]
[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/intel-lab-lkp/linux/commits/guoren-kernel-org/csky-optimize-memcpy_-from-to-io-and-memset_io/20220404-224954
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: csky-randconfig-r022-20220405 (https://download.01.org/0day-ci/archive/20220405/202204052238.Fz736aX3-lkp@intel.com/config)
compiler: csky-linux-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/2e50048555b298851590ec8272100b595b8801f9
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review guoren-kernel-org/csky-optimize-memcpy_-from-to-io-and-memset_io/20220404-224954
        git checkout 2e50048555b298851590ec8272100b595b8801f9
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=csky SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   csky-linux-ld: drivers/bus/mhi/core/init.o: in function `mhi_prepare_for_power_up':
>> init.c:(.text+0xa50): undefined reference to `__memset_io'
>> csky-linux-ld: init.c:(.text+0xaa8): undefined reference to `__memset_io'
   csky-linux-ld: drivers/pci/pci-sysfs.o: in function `pci_read_rom':
>> pci-sysfs.c:(.text+0x2b8): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: pci-sysfs.c:(.text+0x2f4): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/soc/fsl/dpaa2-console.o: in function `dpaa2_console_read':
   dpaa2-console.c:(.text+0xbc): undefined reference to `__memcpy_fromio'
   csky-linux-ld: dpaa2-console.c:(.text+0xee): undefined reference to `__memcpy_fromio'
   csky-linux-ld: dpaa2-console.c:(.text+0x16c): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/misc/hpilo.o: in function `ilo_ccb_close':
>> hpilo.c:(.text+0x204): undefined reference to `__memset_io'
   csky-linux-ld: drivers/misc/hpilo.o: in function `ilo_poll':
   hpilo.c:(.text+0x31c): undefined reference to `__memset_io'
   csky-linux-ld: drivers/misc/hpilo.o: in function `ilo_open':
>> hpilo.c:(.text+0xc3c): undefined reference to `__memcpy_toio'
>> csky-linux-ld: hpilo.c:(.text+0xd1c): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/scsi/smartpqi/smartpqi_init.o: in function `pqi_process_firmware_features':
>> smartpqi_init.c:(.text+0x3a92): undefined reference to `__memcpy_toio'
>> csky-linux-ld: smartpqi_init.c:(.text+0x3b30): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/scsi/smartpqi/smartpqi_init.o: in function `pqi_process_config_table':
>> smartpqi_init.c:(.text+0x3bda): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/smartpqi/smartpqi_init.o: in function `pqi_configure_events.constprop.0':
   smartpqi_init.c:(.text+0x3d68): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `mv_inbound_write':
>> hptiop.c:(.text+0x90e): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `hptiop_post_req_mv':
   hptiop.c:(.text+0x9b4): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `hptiop_request_callback_itl':
>> hptiop.c:(.text+0xa58): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: hptiop.c:(.text+0xa88): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `iop_intr_mv':
   hptiop.c:(.text+0xd48): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `iop_intr_itl':
   hptiop.c:(.text+0xe10): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `iop_get_config_itl':
   hptiop.c:(.text+0x123a): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `iop_set_config_itl':
   hptiop.c:(.text+0x1278): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/scsi/hptiop.o: in function `dma_alloc_coherent.constprop.0':
   hptiop.c:(.text+0x12ec): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: hptiop.c:(.text+0x12f0): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/net/wan/pc300too.o: in function `sca_rx_done':
>> pc300too.c:(.text+0xbfa): undefined reference to `__memcpy_fromio'
>> csky-linux-ld: pc300too.c:(.text+0xc64): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/net/wan/pc300too.o: in function `sca_xmit':
>> pc300too.c:(.text+0xd40): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/net/wan/pc300too.o: in function `sca_poll':
   pc300too.c:(.text+0xf30): undefined reference to `__memcpy_toio'
   csky-linux-ld: fs/pstore/ram_core.o: in function `persistent_ram_update':
>> ram_core.c:(.text+0x164): undefined reference to `__memcpy_toio'
>> csky-linux-ld: ram_core.c:(.text+0x18c): undefined reference to `__memcpy_toio'
   csky-linux-ld: fs/pstore/ram_core.o: in function `persistent_ram_save_old':
>> ram_core.c:(.text+0x4f2): undefined reference to `__memcpy_fromio'
   csky-linux-ld: ram_core.c:(.text+0x500): undefined reference to `__memcpy_fromio'
   csky-linux-ld: fs/pstore/ram_core.o: in function `persistent_ram_write_user':
   ram_core.c:(.text+0x5e0): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/scsi/sym53c8xx_2/sym_hipd.o: in function `sym_start_up':
   sym_hipd.c:(.text+0x3e3e): undefined reference to `__memcpy_toio'
   csky-linux-ld: sym_hipd.c:(.text+0x3e60): undefined reference to `__memcpy_toio'
   csky-linux-ld: sym_hipd.c:(.text+0x3fc8): undefined reference to `__memcpy_toio'
   csky-linux-ld: drivers/remoteproc/remoteproc_coredump.o: in function `rproc_copy_segment':
   remoteproc_coredump.c:(.text+0xb8): undefined reference to `__memcpy_fromio'
   csky-linux-ld: remoteproc_coredump.c:(.text+0xd4): undefined reference to `__memcpy_fromio'
   csky-linux-ld: drivers/remoteproc/remoteproc_elf_loader.o: in function `rproc_elf_load_segments':
   remoteproc_elf_loader.c:(.text+0x328): undefined reference to `__memcpy_toio'
   csky-linux-ld: remoteproc_elf_loader.c:(.text+0x34c): undefined reference to `__memset_io'
   csky-linux-ld: remoteproc_elf_loader.c:(.text+0x378): undefined reference to `__memcpy_toio'
   csky-linux-ld: remoteproc_elf_loader.c:(.text+0x37c): undefined reference to `__memset_io'

-- 
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