ASoC: Intel: avs: Allow for dumping debug window snapshot

Add new read-only debugfs entry which dumps entire content of the SRAM
window 2 i.e.: the debug window.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20221202152841.672536-17-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/avs/debugfs.c b/sound/soc/intel/avs/debugfs.c
index e9042d4..bdd388e 100644 (file)
--- a/sound/soc/intel/avs/debugfs.c
+++ b/sound/soc/intel/avs/debugfs.c
@@ -71,6 +71,31 @@ static const struct file_operations fw_regs_fops = {
        .llseek = no_llseek,
 };
 
+static ssize_t debug_window_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
+{
+       struct avs_dev *adev = file->private_data;
+       size_t size;
+       char *buf;
+       int ret;
+
+       size = adev->hw_cfg.dsp_cores * AVS_WINDOW_CHUNK_SIZE;
+       buf = kzalloc(size, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       memcpy_fromio(buf, avs_sram_addr(adev, AVS_DEBUG_WINDOW), size);
+
+       ret = simple_read_from_buffer(to, count, ppos, buf, size);
+       kfree(buf);
+       return ret;
+}
+
+static const struct file_operations debug_window_fops = {
+       .open = simple_open,
+       .read = debug_window_read,
+       .llseek = no_llseek,
+};
+
 static ssize_t probe_points_read(struct file *file, char __user *to, size_t count, loff_t *ppos)
 {
        struct avs_dev *adev = file->private_data;
@@ -393,6 +418,7 @@ void avs_debugfs_init(struct avs_dev *adev)
        debugfs_create_file("strace", 0444, adev->debugfs_root, adev, &strace_fops);
        debugfs_create_file("trace_control", 0644, adev->debugfs_root, adev, &trace_control_fops);
        debugfs_create_file("fw_regs", 0444, adev->debugfs_root, adev, &fw_regs_fops);
+       debugfs_create_file("debug_window", 0444, adev->debugfs_root, adev, &debug_window_fops);
 
        debugfs_create_u32("trace_aging_period", 0644, adev->debugfs_root,
                           &adev->aging_timer_period);

diff --git a/sound/soc/intel/avs/registers.h b/sound/soc/intel/avs/registers.h
index 95be861..2b464e4 100644 (file)
--- a/sound/soc/intel/avs/registers.h
+++ b/sound/soc/intel/avs/registers.h
@@ -59,7 +59,8 @@
 #define AVS_FW_REG_STATUS(adev)                (AVS_FW_REG_BASE(adev) + 0x0)
 #define AVS_FW_REG_ERROR_CODE(adev)    (AVS_FW_REG_BASE(adev) + 0x4)
 
-#define AVS_FW_REGS_SIZE               PAGE_SIZE
+#define AVS_WINDOW_CHUNK_SIZE          PAGE_SIZE
+#define AVS_FW_REGS_SIZE               AVS_WINDOW_CHUNK_SIZE
 #define AVS_FW_REGS_WINDOW             0
 /* DSP -> HOST communication window */
 #define AVS_UPLINK_WINDOW              AVS_FW_REGS_WINDOW