From 27ebf21f9220e5991cf33c34d6b47e8dea4fe905 Mon Sep 17 00:00:00 2001
From: Lijo Lazar <lijo.lazar@amd.com>
Date: Thu, 15 Apr 2021 15:29:22 +0800
Subject: [PATCH] drm/amd/pm: Add debugfs node to read private buffer
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Add debugfs interface to read region allocated for FW private buffer
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/pm/amdgpu_pm.c | 44 ++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index 4e459ef632ef4..e054249e1497d 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -3534,6 +3534,45 @@ static int amdgpu_debugfs_pm_info_show(struct seq_file *m, void *unused)
DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_pm_info);
+/*
+ * amdgpu_pm_priv_buffer_read - Read memory region allocated to FW
+ *
+ * Reads debug memory region allocated to PMFW
+ */
+static ssize_t amdgpu_pm_prv_buffer_read(struct file *f, char __user *buf,
+ size_t size, loff_t *pos)
+{
+ struct amdgpu_device *adev = file_inode(f)->i_private;
+ const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
+ void *pp_handle = adev->powerplay.pp_handle;
+ size_t smu_prv_buf_size;
+ void *smu_prv_buf;
+
+ if (amdgpu_in_reset(adev))
+ return -EPERM;
+ if (adev->in_suspend && !adev->in_runpm)
+ return -EPERM;
+
+ if (pp_funcs && pp_funcs->get_smu_prv_buf_details)
+ pp_funcs->get_smu_prv_buf_details(pp_handle, &smu_prv_buf,
+ &smu_prv_buf_size);
+ else
+ return -ENOSYS;
+
+ if (!smu_prv_buf || !smu_prv_buf_size)
+ return -EINVAL;
+
+ return simple_read_from_buffer(buf, size, pos, smu_prv_buf,
+ smu_prv_buf_size);
+}
+
+static const struct file_operations amdgpu_debugfs_pm_prv_buffer_fops = {
+ .owner = THIS_MODULE,
+ .open = simple_open,
+ .read = amdgpu_pm_prv_buffer_read,
+ .llseek = default_llseek,
+};
+
#endif
void amdgpu_debugfs_pm_init(struct amdgpu_device *adev)
@@ -3545,5 +3584,10 @@ void amdgpu_debugfs_pm_init(struct amdgpu_device *adev)
debugfs_create_file("amdgpu_pm_info", 0444, root, adev,
&amdgpu_debugfs_pm_info_fops);
+ if (adev->pm.smu_prv_buffer_size > 0)
+ debugfs_create_file_size("amdgpu_pm_prv_buffer", 0444, root,
+ adev,
+ &amdgpu_debugfs_pm_prv_buffer_fops,
+ adev->pm.smu_prv_buffer_size);
#endif
}
--
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