Hi Vinod,

Thanks for reviewing.

On Wed, 19 Aug 2015, Vinod Koul wrote:

On Wed, Jul 08, 2015 at 05:11:24PM +0100, Peter Griffin wrote:

quoted

+static int
+st_fdma_elf_sanity_check(struct st_fdma_dev *fdev, const struct firmware *fw)
+{
+	const char *fw_name = fdev->pdata->fw_name;
+	struct elf32_hdr *ehdr;
+	char class;
+
+	if (!fw) {
+		dev_err(fdev->dev, "failed to load %s\n", fw_name);
+		return -EINVAL;
+	}
+
+	if (fw->size < sizeof(struct elf32_hdr)) {

sizeof(*ehdr) ?

Ok fixed in v2.

quoted

+		dev_err(fdev->dev, "Image is too small\n");
+		return -EINVAL;
+	}
+
+	ehdr = (struct elf32_hdr *)fw->data;
+
+	/* We only support ELF32 at this point */
+	class = ehdr->e_ident[EI_CLASS];
+	if (class != ELFCLASS32) {
+		dev_err(fdev->dev, "Unsupported class: %d\n", class);
+		return -EINVAL;
+	}
+
+	if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
+		dev_err(fdev->dev, "Unsupported firmware endianness\n");

would be worth printing the value for debug

Fixed in v2

quoted

+		return -EINVAL;
+	}
+
+	if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
+		dev_err(fdev->dev, "Image is too small\n");

Again printing size helps when you get a log trace and have no idea why size
was small. Similar one other places

Fixed in v2

quoted

+		dst = st_fdma_seg_to_mem(fdev, da, memsz);
+		if (!dst) {
+			dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
+			break;
+		}
+
+		if (phdr->p_filesz)
+			memcpy(dst, elf_data + phdr->p_offset, filesz);
+
+		if (memsz > filesz)
+			memset(dst + filesz, 0, memsz - filesz);
+
+		mem_loaded++;
+	}
+
+	return (mem_loaded != fdev->drvdata->num_mem) ? -EINVAL : 0;

so you are not expecting any segment with PT_LOAD otherwise this check will
fail as num_mem is assigned from e_phnum.

That is correct.

Also perhaps EIO will be better return?

Updated to -EIO in v2.

quoted

+}
+
+static void st_fdma_enable(struct st_fdma_dev *fdev)
+{
+	unsigned long hw_id, hw_ver, fw_rev;
+	u32 val;
+
+	/* disable CPU pipeline clock & reset cpu pipeline */
+	val = FDMA_CLK_GATE_DIS | FDMA_CLK_GATE_RESET;
+	fdma_write(fdev, val, CLK_GATE);

empty line here

Removed in v2.

quoted

+	/* disable SLIM core STBus sync */
+	fdma_write(fdev, FDMA_STBUS_SYNC_DIS, STBUS_SYNC);
+	/* enable cpu pipeline clock */
+	fdma_write(fdev, !FDMA_CLK_GATE_DIS, CLK_GATE);
+
+	/* clear int & cmd mailbox */
+	fdma_write(fdev, ~0UL, INT_CLR);
+	fdma_write(fdev, ~0UL, CMD_CLR);

here too

Removed in v2.

quoted

+static int st_fdma_get_fw(struct st_fdma_dev *fdev)
+{
+	int ret;
+
+	init_completion(&fdev->fw_ack);
+	atomic_set(&fdev->fw_loaded, 0);
+
+	ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
+				      fdev->pdata->fw_name, fdev->dev,
+				      GFP_KERNEL, fdev, st_fdma_fw_cb);

Isn't doing this in device probe too stringent and holding up load...

No I don't think so, as we are using the _nowait variant which is
asynchronous and sleeps for the smallest period possible so as not
to increase boot time of built-in code.

We could use GFP_ATOMIC which means request_firmware_nowait can't sleep
at all. Although no other drivers which use request_firmware_nowait
in their probe functions do that which I can see.

quoted

+	fdesc = st_fdma_alloc_desc(fchan, sg_len);
+	if (!fdesc) {
+		dev_err(fchan->fdev->dev, "no memory for desc\n");
+		return NULL;
+	}
+
+	fdesc->iscyclic = false;
+
+	for_each_sg(sgl, sg, sg_len, i) {
+		hw_node = fdesc->node[i].desc;
+
+		hw_node->next = fdesc->node[(i + 1) % sg_len].pdesc;
+		hw_node->control = NODE_CTRL_REQ_MAP_DREQ(fchan->dreq_line);
+
+		if (direction == DMA_MEM_TO_DEV) {
+			hw_node->control |= NODE_CTRL_SRC_INCR;
+			hw_node->control |= NODE_CTRL_DST_STATIC;
+			hw_node->saddr = sg_dma_address(sg);
+			hw_node->daddr = fchan->cfg.dev_addr;
+		} else {
+			hw_node->control |= NODE_CTRL_SRC_STATIC;
+			hw_node->control |= NODE_CTRL_DST_INCR;
+			hw_node->saddr = fchan->cfg.dev_addr;
+			hw_node->daddr = sg_dma_address(sg);
+		}
+
+		hw_node->nbytes = sg_dma_len(sg);
+		hw_node->generic.length = sg_dma_len(sg);
+		hw_node->generic.sstride = 0;
+		hw_node->generic.dstride = 0;

This looks quite similar to previous one, I think some bits can be reused

Will abstract out common parts in v2.

quoted

+static int st_fdma_slave_config(struct dma_chan *chan,
+				struct dma_slave_config *slave_cfg)
+{
+	u32 maxburst = 0, addr = 0;
+	enum dma_slave_buswidth width;
+	struct st_fdma_chan *fchan = to_st_fdma_chan(chan);
+	int ch_id = fchan->vchan.chan.chan_id;
+	struct st_fdma_dev *fdev = fchan->fdev;
+
+	if (slave_cfg->direction == DMA_DEV_TO_MEM) {

This is depreciated, you can't use direction here. Please save the fields and
then use them in prep_ call

Ok, will save the fields and use in prep_ calls in v2.

Also this is quite big patch, consider splitting it up for faster review

Will split into smaller patches in v2.

regards,

Peter.