[PATCH v3 6/8] drivers/soc: xdma: Add debugfs entries

Eddie James
2019-05-29T18:10:50Z

Add debugfs entries for the relevant XDMA engine registers and for
dumping the AST2500 reserved memory space.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
drivers/soc/aspeed/aspeed-xdma.c | 94 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 94 insertions(+)

diff --git a/drivers/soc/aspeed/aspeed-xdma.c b/drivers/soc/aspeed/aspeed-xdma.c
index ddd5e1e..ea42dbe 100644
--- a/drivers/soc/aspeed/aspeed-xdma.c
+++ b/drivers/soc/aspeed/aspeed-xdma.c
@@ -145,6 +145,12 @@ struct aspeed_xdma {

char pcidev[4];
struct miscdevice misc;
+ struct dentry *debugfs_dir;
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ struct debugfs_regset32 regset;
+ struct debugfs_reg32 regs[XDMA_NUM_DEBUGFS_REGS];
+#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
};

struct aspeed_xdma_client {
@@ -603,6 +609,90 @@ static int aspeed_xdma_init_mem(struct aspeed_xdma *ctx, u32 conf)
return rc;
}

+static ssize_t aspeed_xdma_debugfs_vga_read(struct file *file,
+ char __user *buf, size_t len,
+ loff_t *offset)
+{
+ int rc = -ENOMEM;
+ struct inode *inode = file_inode(file);
+ struct aspeed_xdma *ctx = inode->i_private;
+ loff_t offs = *offset;
+ void *tmp;
+ void __iomem *vga;
+
+ if (len + offs > ctx->vga_size) {
+ if (offs < ctx->vga_size)
+ len = ctx->vga_size - offs;
+ else
+ return 0;
+ }
+
+ vga = ioremap(ctx->vga_phys, ctx->vga_size);
+ if (!vga)
+ return rc;
+
+ tmp = kzalloc(len, GFP_KERNEL);
+ if (!tmp)
+ goto unmap;
+
+ memcpy_fromio(tmp, vga + offs, len);
+
+ rc = copy_to_user(buf, tmp, len);
+ if (rc)
+ goto free;
+
+ *offset = offs + len;
+ rc = len;
+
+free:
+ kfree(tmp);
+
+unmap:
+ iounmap(vga);
+
+ return rc;
+}
+
+static const struct file_operations aspeed_xdma_debugfs_vga_fops = {
+ .owner = THIS_MODULE,
+ .llseek = generic_file_llseek,
+ .read = aspeed_xdma_debugfs_vga_read,
+};
+
+static void aspeed_xdma_init_debugfs(struct aspeed_xdma *ctx)
+{
+ if (!IS_ENABLED(CONFIG_DEBUG_FS))
+ return;
+
+ ctx->debugfs_dir = debugfs_create_dir(DEVICE_NAME, NULL);
+ if (IS_ERR(ctx->debugfs_dir)) {
+ dev_warn(ctx->dev, "Failed to create debugfs directory.\n");
+ return;
+ }
+
+ debugfs_create_file("vga", 0444, ctx->debugfs_dir, ctx,
+ &aspeed_xdma_debugfs_vga_fops);
+
+ ctx->regs[0].name = "addr";
+ ctx->regs[0].offset = XDMA_BMC_CMD_QUEUE_ADDR;
+ ctx->regs[1].name = "endp";
+ ctx->regs[1].offset = XDMA_BMC_CMD_QUEUE_ENDP;
+ ctx->regs[2].name = "writep";
+ ctx->regs[2].offset = XDMA_BMC_CMD_QUEUE_WRITEP;
+ ctx->regs[3].name = "readp";
+ ctx->regs[3].offset = XDMA_BMC_CMD_QUEUE_READP;
+ ctx->regs[4].name = "control";
+ ctx->regs[4].offset = XDMA_CTRL;
+ ctx->regs[5].name = "status";
+ ctx->regs[5].offset = XDMA_STATUS;
+
+ ctx->regset.regs = ctx->regs;
+ ctx->regset.nregs = XDMA_NUM_DEBUGFS_REGS;
+ ctx->regset.base = ctx->base;
+
+ debugfs_create_regset32("regs", 0444, ctx->debugfs_dir, &ctx->regset);
+}
+
static int aspeed_xdma_change_pcie_conf(struct aspeed_xdma *ctx, u32 conf)
{
int rc;
@@ -777,6 +867,8 @@ static int aspeed_xdma_probe(struct platform_device *pdev)

device_create_file(dev, &dev_attr_pcidev);

+ aspeed_xdma_init_debugfs(ctx);
+
return 0;
}

@@ -784,6 +876,8 @@ static int aspeed_xdma_remove(struct platform_device *pdev)
{
struct aspeed_xdma *ctx = platform_get_drvdata(pdev);

+ debugfs_remove_recursive(ctx->debugfs_dir);
+
device_remove_file(ctx->dev, &dev_attr_pcidev);

misc_deregister(&ctx->misc);
--
1.8.3.1