Am 22.02.22 um 16:34 schrieb Somalapuram Amaranath:
List of register populated for dump collection during the GPU reset.
Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 4 +
drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 83 +++++++++++++++++++++
2 files changed, 87 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index b85b67a88a3d..6e35f2c4c869 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1097,6 +1097,10 @@ struct amdgpu_device {
struct amdgpu_reset_control *reset_cntl;
uint32_t ip_versions[HW_ID_MAX][HWIP_MAX_INSTANCE];
+
+ /* reset dump register */
+ uint32_t *reset_dump_reg_list;
+ int num_regs;
};
static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index 164d6a9e9fbb..0cc80aa1b5ec 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1609,6 +1609,87 @@ DEFINE_DEBUGFS_ATTRIBUTE(fops_ib_preempt, NULL,
DEFINE_DEBUGFS_ATTRIBUTE(fops_sclk_set, NULL,
amdgpu_debugfs_sclk_set, "%llu\n");
+static ssize_t amdgpu_reset_dump_register_list_read(struct file *f,
+ char __user *buf, size_t size, loff_t *pos)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
+ char reg_offset[11];
+ int i, ret, len = 0;
+
+ if (*pos)
+ return 0;
+
+ ret = down_read_killable(&adev->reset_sem);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < adev->num_regs; i++) {
+ sprintf(reg_offset, "0x%x\n", adev->reset_dump_reg_list[i]);
+ up_read(&adev->reset_sem);
+ ret = copy_to_user(buf + len, reg_offset, strlen(reg_offset));
+ if (ret)
+ return -EFAULT;
+
+ len += strlen(reg_offset);
+ ret = down_read_killable(&adev->reset_sem);
+ if (ret)
+ return ret;
+ }
+
+ up_read(&adev->reset_sem);
+ if (ret)
+ return ret;
That if and return now looks superfluous.
+
+ *pos += len;
+
+ return len;
+}
+
+static ssize_t amdgpu_reset_dump_register_list_write(struct file *f,
+ const char __user *buf, size_t size, loff_t *pos)
+{
+ struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
+ char reg_offset[12];
+ uint32_t *tmp;
+ int ret, i = 0, len = 0;
+
+ do {
+ memset(reg_offset, 0, 12);
+ if (copy_from_user(reg_offset, buf + len,
+ min(11, ((int)size-len)))) {
+ ret = -EFAULT;
+ goto error_free;
+ }
+
+ tmp = krealloc_array(tmp, i + 1, sizeof(uint32_t), GFP_KERNEL);
+ if (sscanf(reg_offset, "%X %n", &tmp[i], &ret) != 1)
Does this also work when we write the registers separated with newlines
into the debugfs file?
Regards,
Christian.
+ goto error_free;
+
+ len += ret;
+ i++;
+ } while (len < size);
+
+ ret = down_write_killable(&adev->reset_sem);
+ if (ret)
+ goto error_free;
+
+ swap(adev->reset_dump_reg_list, tmp);
+ adev->num_regs = i;
+ up_write(&adev->reset_sem);
+ ret = size;
+
+error_free:
+ kfree(tmp);
+ return ret;
+}
+
+static const struct file_operations amdgpu_reset_dump_register_list = {
+ .owner = THIS_MODULE,
+ .read = amdgpu_reset_dump_register_list_read,
+ .write = amdgpu_reset_dump_register_list_write,
+ .llseek = default_llseek
+};
+
int amdgpu_debugfs_init(struct amdgpu_device *adev)
{
struct dentry *root = adev_to_drm(adev)->primary->debugfs_root;
@@ -1672,6 +1753,8 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
&amdgpu_debugfs_test_ib_fops);
debugfs_create_file("amdgpu_vm_info", 0444, root, adev,
&amdgpu_debugfs_vm_info_fops);
+ debugfs_create_file("amdgpu_reset_dump_register_list", 0644, root, adev,
+ &amdgpu_reset_dump_register_list);
adev->debugfs_vbios_blob.data = adev->bios;
adev->debugfs_vbios_blob.size = adev->bios_size;
