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drm/amd/display: Add DMUB firmware state debugfs

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[Why]
Firmware state helps to debug sequence issues and hangs for DMCUB
commands and we don't have an easy mechanism to dump it from the driver.

[How]
Add a debugfs entry to dump the current firmware state.
Example usage:

cat /sys/kernel/debug/dri/0/amdgpu_dm_dmub_fw_state

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Hersen Wu <hersenxs.wu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2020-02-11 09:48:18 -05:00 committed by Alex Deucher
parent c11e57f050
commit 2364076772
1 changed files with 27 additions and 0 deletions
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27
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View file

@ -732,6 +732,29 @@ static int dmub_tracebuffer_show(struct seq_file *m, void *data)
return 0;
}
/**
* Returns the DMCUB firmware state contents.
* Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dmub_fw_state
*/
static int dmub_fw_state_show(struct seq_file *m, void *data)
{
struct amdgpu_device *adev = m->private;
struct dmub_srv_fb_info *fb_info = adev->dm.dmub_fb_info;
uint8_t *state_base;
uint32_t state_size;
if (!fb_info)
return 0;
state_base = (uint8_t *)fb_info->fb[DMUB_WINDOW_6_FW_STATE].cpu_addr;
if (!state_base)
return 0;
state_size = fb_info->fb[DMUB_WINDOW_6_FW_STATE].size;
return seq_write(m, state_base, state_size);
}
/*
* Returns the current and maximum output bpc for the connector.
* Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
@ -937,6 +960,7 @@ static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf,
return read_size - r;
}
DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
DEFINE_SHOW_ATTRIBUTE(output_bpc);
DEFINE_SHOW_ATTRIBUTE(vrr_range);
@ -1249,5 +1273,8 @@ int dtn_debugfs_init(struct amdgpu_device *adev)
debugfs_create_file_unsafe("amdgpu_dm_dmub_tracebuffer", 0644, root,
adev, &dmub_tracebuffer_fops);
debugfs_create_file_unsafe("amdgpu_dm_dmub_fw_state", 0644, root,
adev, &dmub_fw_state_fops);
return 0;
}