scsi: ufs: dump device descriptor info via debugfs
This change adds a debugfs capability to dump Device Descriptor information, parsed and detailed. It helps developer to get important information about the UFS device it handles. Change-Id: Ia149e4c82e33755b235eb6afe52541c8b23a0708 Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
This commit is contained in:
Yaniv Gardi
David Keitel
parent
277e3a5096
commit
06a49c67f7
3 changed files with 129 additions and 0 deletions
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@ -20,6 +20,17 @@
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#include <linux/random.h>
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#include "debugfs.h"
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enum field_width {
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BYTE = 1,
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WORD = 2,
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};
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struct desc_field_offset {
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char *name;
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int offset;
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enum field_width width_byte;
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};
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#ifdef CONFIG_UFS_FAULT_INJECTION
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#define INJECT_COMMAND_HANG (0x0)
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@ -306,6 +317,79 @@ static const struct file_operations ufsdbg_host_regs_fops = {
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.read = seq_read,
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};
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static int ufsdbg_dump_device_desc_show(struct seq_file *file, void *data)
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{
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int err = 0;
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int buff_len = QUERY_DESC_DEVICE_MAX_SIZE;
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u8 desc_buf[QUERY_DESC_DEVICE_MAX_SIZE];
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struct ufs_hba *hba = (struct ufs_hba *)file->private;
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struct desc_field_offset device_desc_field_name[] = {
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{"bLength", 0x00, BYTE},
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{"bDescriptorType", 0x01, BYTE},
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{"bDevice", 0x02, BYTE},
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{"bDeviceClass", 0x03, BYTE},
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{"bDeviceSubClass", 0x04, BYTE},
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{"bProtocol", 0x05, BYTE},
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{"bNumberLU", 0x06, BYTE},
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{"bNumberWLU", 0x07, BYTE},
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{"bBootEnable", 0x08, BYTE},
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{"bDescrAccessEn", 0x09, BYTE},
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{"bInitPowerMode", 0x0A, BYTE},
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{"bHighPriorityLUN", 0x0B, BYTE},
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{"bSecureRemovalType", 0x0C, BYTE},
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{"bSecurityLU", 0x0D, BYTE},
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{"Reserved", 0x0E, BYTE},
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{"bInitActiveICCLevel", 0x0F, BYTE},
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{"wSpecVersion", 0x10, WORD},
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{"wManufactureDate", 0x12, WORD},
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{"iManufactureName", 0x14, BYTE},
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{"iProductName", 0x15, BYTE},
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{"iSerialNumber", 0x16, BYTE},
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{"iOemID", 0x17, BYTE},
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{"wManufactureID", 0x18, WORD},
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{"bUD0BaseOffset", 0x1A, BYTE},
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{"bUDConfigPLength", 0x1B, BYTE},
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{"bDeviceRTTCap", 0x1C, BYTE},
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{"wPeriodicRTCUpdate", 0x1D, WORD}
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};
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pm_runtime_get_sync(hba->dev);
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err = ufshcd_read_device_desc(hba, desc_buf, buff_len);
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pm_runtime_put_sync(hba->dev);
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if (!err) {
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int i;
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struct desc_field_offset *tmp;
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for (i = 0; i < ARRAY_SIZE(device_desc_field_name); ++i) {
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tmp = &device_desc_field_name[i];
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if (tmp->width_byte == BYTE) {
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seq_printf(file,
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"Device Descriptor[Byte offset 0x%x]: %s = 0x%x\n",
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tmp->offset,
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tmp->name,
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(u8)desc_buf[tmp->offset]);
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} else if (tmp->width_byte == WORD) {
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seq_printf(file,
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"Device Descriptor[Byte offset 0x%x]: %s = 0x%x\n",
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tmp->offset,
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tmp->name,
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*(u16 *)&desc_buf[tmp->offset]);
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} else {
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seq_printf(file,
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"Device Descriptor[offset 0x%x]: %s. Wrong Width = %d",
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tmp->offset, tmp->name, tmp->width_byte);
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}
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}
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} else {
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seq_printf(file, "Reading Device Descriptor failed. err = %d\n",
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err);
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}
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return err;
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}
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static int ufsdbg_show_hba_show(struct seq_file *file, void *data)
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{
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struct ufs_hba *hba = (struct ufs_hba *)file->private;
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@ -347,6 +431,17 @@ static const struct file_operations ufsdbg_show_hba_fops = {
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.read = seq_read,
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};
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static int ufsdbg_dump_device_desc_open(struct inode *inode, struct file *file)
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{
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return single_open(file,
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ufsdbg_dump_device_desc_show, inode->i_private);
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}
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static const struct file_operations ufsdbg_dump_device_desc = {
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.open = ufsdbg_dump_device_desc_open,
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.read = seq_read,
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};
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void ufsdbg_add_debugfs(struct ufs_hba *hba)
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{
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if (!hba) {
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@ -400,6 +495,16 @@ void ufsdbg_add_debugfs(struct ufs_hba *hba)
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goto err;
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}
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hba->debugfs_files.dump_dev_desc =
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debugfs_create_file("dump_device_desc", S_IRUSR,
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hba->debugfs_files.debugfs_root, hba,
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&ufsdbg_dump_device_desc);
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if (!hba->debugfs_files.dump_dev_desc) {
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dev_err(hba->dev,
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"%s: NULL dump_device_desc file, exiting", __func__);
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goto err;
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}
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ufsdbg_setup_fault_injection(hba);
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return;
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@ -2046,6 +2046,27 @@ static inline int ufshcd_read_power_desc(struct ufs_hba *hba,
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return err;
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}
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int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size)
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{
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int err = 0;
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int retries;
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for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
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/* Read descriptor*/
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err = ufshcd_read_desc(hba,
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QUERY_DESC_IDN_DEVICE, 0, buf, size);
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if (!err)
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break;
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dev_dbg(hba->dev, "%s: error %d retrying\n", __func__, err);
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}
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if (err)
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dev_err(hba->dev, "%s: reading Device Desc failed. err = %d\n",
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__func__, err);
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return err;
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}
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/**
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* ufshcd_read_unit_desc_param - read the specified unit descriptor parameter
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* @hba: Pointer to adapter instance
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@ -346,6 +346,7 @@ struct debugfs_files {
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struct dentry *tag_stats;
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struct dentry *show_hba;
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struct dentry *host_regs;
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struct dentry *dump_dev_desc;
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#ifdef CONFIG_UFS_FAULT_INJECTION
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struct fault_attr fail_attr;
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#endif
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@ -742,6 +743,8 @@ static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,
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return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
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}
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int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size);
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/* variant specific ops structures */
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#ifdef CONFIG_SCSI_UFS_MSM
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extern const struct ufs_hba_variant_ops ufs_hba_msm_vops;
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