[PATCH 2/2] remoteproc: imx_dsp_rproc: Implement .memcpy_tova()

[Uwe Kleine-König]

This callback allows to use the core's rproc_elf_load_segments()
function instead of reimplementing it for very minor changes.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>
---
 drivers/remoteproc/imx_dsp_rproc.c | 120 ++++++++---------------------
 1 file changed, 30 insertions(+), 90 deletions(-)

diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
index 96d619daf3f5..324c10f18507 100644
--- a/drivers/remoteproc/imx_dsp_rproc.c
+++ b/drivers/remoteproc/imx_dsp_rproc.c
@@ -864,97 +864,41 @@ static int imx_dsp_rproc_memset(void *addr, u8 value, size_t size)
 	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 loads the firmware segments to memory, where the remote
- * processor expects them.
- *
- * Return: 0 on success and an appropriate error code otherwise
- */
-static int imx_dsp_rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
+static int imx_dsp_rproc_memcpy_tova(struct rproc *rproc, u64 da, const void *src,
+				     size_t filesz, size_t memsz)
 {
 	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);
+	void *ptr;
+	int ret;
 
-	ehdr = elf_data;
-	phnum = elf_hdr_get_e_phnum(class, ehdr);
-	phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr);
+	/* 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%zx\n", da, memsz);
+		return -EINVAL;
+	}
 
-	/* 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 || !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) {
-			ret = imx_dsp_rproc_memcpy(ptr, elf_data + offset, filesz);
-			if (ret) {
-				dev_err(dev, "memory copy failed for da 0x%llx memsz 0x%llx\n",
-					da, memsz);
-				break;
-			}
-		}
-
-		/* zero out remaining memory for this segment */
-		if (memsz > filesz) {
-			ret = imx_dsp_rproc_memset(ptr + filesz, 0, memsz - filesz);
-			if (ret) {
-				dev_err(dev, "memset failed for da 0x%llx memsz 0x%llx\n",
-					da, memsz);
-				break;
-			}
+	/* put the segment where the remote processor expects it */
+	if (filesz) {
+		ret = imx_dsp_rproc_memcpy(ptr, src, filesz);
+		if (ret) {
+			dev_err(dev, "memory copy failed for da 0x%llx memsz 0x%zx\n",
+				da, memsz);
+			return ret;
 		}
 	}
 
-	return ret;
+	/* zero out remaining memory for this segment */
+	if (memsz > filesz) {
+		ret = imx_dsp_rproc_memset(ptr + filesz, 0, memsz - filesz);
+		if (ret) {
+			dev_err(dev, "memset failed for da 0x%llx memsz 0x%zx\n",
+				da, memsz);
+			return ret;
+		}
+	}
+
+	return 0;
 }
 
 static int imx_dsp_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
@@ -969,7 +913,6 @@ static int imx_dsp_rproc_load(struct rproc *rproc, const struct firmware *fw)
 	struct imx_dsp_rproc *priv = rproc->priv;
 	const struct imx_dsp_rproc_dcfg *dsp_dcfg = priv->dsp_dcfg;
 	struct rproc_mem_entry *carveout;
-	int ret;
 
 	/* Reset DSP if needed */
 	if (dsp_dcfg->reset)
@@ -985,11 +928,7 @@ static int imx_dsp_rproc_load(struct rproc *rproc, const struct firmware *fw)
 		}
 	}
 
-	ret = imx_dsp_rproc_elf_load_segments(rproc, fw);
-	if (ret)
-		return ret;
-
-	return 0;
+	return rproc_elf_load_segments(rproc, fw);
 }
 
 static const struct rproc_ops imx_dsp_rproc_ops = {
@@ -998,6 +937,7 @@ static const struct rproc_ops imx_dsp_rproc_ops = {
 	.start		= imx_dsp_rproc_start,
 	.stop		= imx_dsp_rproc_stop,
 	.kick		= imx_dsp_rproc_kick,
+	.memcpy_tova	= imx_dsp_rproc_memcpy_tova,
 	.load		= imx_dsp_rproc_load,
 	.parse_fw	= imx_dsp_rproc_parse_fw,
 	.handle_rsc	= imx_dsp_rproc_handle_rsc,
-- 
2.47.3