| Message ID | 1597096865-19636-9-git-send-email-bbhatt@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce features and debugfs/sysfs entries for MHI | expand |
Hi Bhaumik,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v5.8 next-20200810]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Bhaumik-Bhatt/Introduce-features-and-debugfs-sysfs-entries-for-MHI/20200811-060436
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fc80c51fd4b23ec007e88d4c688f2cac1b8648e7
config: arm64-randconfig-r001-20200810 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 3a34228bff6fdf45b50cb57cf5fb85d659eeb672)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>, old ones prefixed by <<):
WARNING: modpost: missing MODULE_LICENSE() in drivers/bus/mhi/core/main.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/bus/mhi/core/pm.o
WARNING: modpost: missing MODULE_LICENSE() in drivers/bus/mhi/core/boot.o
>> ERROR: modpost: "mhi_ready_state_transition" [drivers/bus/mhi/core/boot.ko] undefined!
ERROR: modpost: "mhi_state_str" [drivers/bus/mhi/core/boot.ko] undefined!
ERROR: modpost: "to_mhi_pm_state_str" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_ee_str" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_read_reg" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_set_mhi_state" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_read_reg_field" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_get_exec_env" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_write_reg_field" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_write_reg" [drivers/bus/mhi/core/boot.ko] undefined!
>> ERROR: modpost: "mhi_free_bhie_table" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_write_db" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_get_mhi_state" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_init_dev_ctxt" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_deinit_dev_ctxt" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_deinit_free_irq" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_read_reg" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_init_irq_setup" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_state_str" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_destroy_device" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_write_reg" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "dev_state_tran_str" [drivers/bus/mhi/core/pm.ko] undefined!
>> ERROR: modpost: "mhi_create_devices" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_fw_load_handler" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_get_exec_env" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_ring_chan_db" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_ring_cmd_db" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "to_mhi_pm_state_str" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_ring_er_db" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_init_mmio" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_read_reg_field" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_write_reg_field" [drivers/bus/mhi/core/pm.ko] undefined!
ERROR: modpost: "mhi_init_chan_ctxt" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_deinit_chan_ctxt" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "to_mhi_pm_state_str" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_pm_m3_transition" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_pm_m0_transition" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_queue_state_transition" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_pm_m1_transition" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_pm_sys_err_handler" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_state_str" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_ee_str" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_tryset_pm_state" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_alloc_device" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_bus_type" [drivers/bus/mhi/core/main.ko] undefined!
ERROR: modpost: "mhi_reset_chan" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_prepare_channel" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_free_bhie_table" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_rddm_prepare" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_alloc_bhie_table" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_read_reg" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_unmap_single_no_bb" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_unmap_single_use_bb" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_map_single_no_bb" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_map_single_use_bb" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_ctrl_ev_task" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_ev_task" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_pm_st_worker" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_process_ctrl_ev_ring" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_process_data_event_ring" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_db_brstmode_disable" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_db_brstmode" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_write_reg_field" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_write_reg" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_read_reg_field" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_irq_handler" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_intvec_threaded_handler" [drivers/bus/mhi/core/init.ko] undefined!
ERROR: modpost: "mhi_intvec_handler" [drivers/bus/mhi/core/init.ko] undefined!
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
On Mon, Aug 10, 2020 at 03:01:02PM -0700, Bhaumik Bhatt wrote: > Introduce debugfs entries to show state, register, channel, device, > and event rings information. Allow the host to dump registers, > issue device wake, and change the MHI timeout to help in debug. > > Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Thanks, Mani > --- > drivers/bus/mhi/Kconfig | 8 + > drivers/bus/mhi/core/Makefile | 5 +- > drivers/bus/mhi/core/debugfs.c | 409 ++++++++++++++++++++++++++++++++++++++++ > drivers/bus/mhi/core/init.c | 7 + > drivers/bus/mhi/core/internal.h | 24 +++ > include/linux/mhi.h | 2 + > 6 files changed, 452 insertions(+), 3 deletions(-) > create mode 100644 drivers/bus/mhi/core/debugfs.c > > diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig > index a8bd9bd..6a217ff 100644 > --- a/drivers/bus/mhi/Kconfig > +++ b/drivers/bus/mhi/Kconfig > @@ -12,3 +12,11 @@ config MHI_BUS > communication protocol used by the host processors to control > and communicate with modem devices over a high speed peripheral > bus or shared memory. > + > +config MHI_BUS_DEBUG > + bool "Debugfs support for the MHI bus" > + depends on MHI_BUS && DEBUG_FS > + help > + Enable debugfs support for use with the MHI transport. Allows > + reading and/or modifying some values within the MHI controller > + for debug and test purposes. > diff --git a/drivers/bus/mhi/core/Makefile b/drivers/bus/mhi/core/Makefile > index 66e2700..460a548 100644 > --- a/drivers/bus/mhi/core/Makefile > +++ b/drivers/bus/mhi/core/Makefile > @@ -1,3 +1,2 @@ > -obj-$(CONFIG_MHI_BUS) := mhi.o > - > -mhi-y := init.o main.o pm.o boot.o > +obj-$(CONFIG_MHI_BUS) := init.o main.o pm.o boot.o > +obj-$(CONFIG_MHI_BUS_DEBUG) += debugfs.o > diff --git a/drivers/bus/mhi/core/debugfs.c b/drivers/bus/mhi/core/debugfs.c > new file mode 100644 > index 0000000..a249aa6 > --- /dev/null > +++ b/drivers/bus/mhi/core/debugfs.c > @@ -0,0 +1,409 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2020, The Linux Foundation. All rights reserved. > + * > + */ > + > +#include <linux/debugfs.h> > +#include <linux/device.h> > +#include <linux/interrupt.h> > +#include <linux/list.h> > +#include <linux/mhi.h> > +#include "internal.h" > + > +static int mhi_debugfs_states_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + > + /* states */ > + seq_printf(m, "PM state: %s Device: %s MHI state: %s EE: %s wake: %s\n", > + to_mhi_pm_state_str(mhi_cntrl->pm_state), > + mhi_is_active(mhi_cntrl) ? "Active" : "Inactive", > + TO_MHI_STATE_STR(mhi_cntrl->dev_state), > + TO_MHI_EXEC_STR(mhi_cntrl->ee), > + mhi_cntrl->wake_set ? "true" : "false"); > + > + /* counters */ > + seq_printf(m, "M0: %u M2: %u M3: %u", mhi_cntrl->M0, mhi_cntrl->M2, > + mhi_cntrl->M3); > + > + seq_printf(m, " device wake: %u pending packets: %u\n", > + atomic_read(&mhi_cntrl->dev_wake), > + atomic_read(&mhi_cntrl->pending_pkts)); > + > + return 0; > +} > + > +static int mhi_debugfs_events_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + struct mhi_event *mhi_event; > + struct mhi_event_ctxt *er_ctxt; > + int i; > + > + if (!mhi_is_active(mhi_cntrl)) { > + seq_puts(m, "Device not ready\n"); > + return -ENODEV; > + } > + > + er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt; > + mhi_event = mhi_cntrl->mhi_event; > + for (i = 0; i < mhi_cntrl->total_ev_rings; > + i++, er_ctxt++, mhi_event++) { > + struct mhi_ring *ring = &mhi_event->ring; > + > + if (mhi_event->offload_ev) { > + seq_printf(m, "Index: %d is an offload event ring\n", > + i); > + continue; > + } > + > + seq_printf(m, "Index: %d intmod count: %lu time: %lu", > + i, (er_ctxt->intmod & EV_CTX_INTMODC_MASK) >> > + EV_CTX_INTMODC_SHIFT, > + (er_ctxt->intmod & EV_CTX_INTMODT_MASK) >> > + EV_CTX_INTMODT_SHIFT); > + > + seq_printf(m, " base: 0x%0llx len: 0x%llx", er_ctxt->rbase, > + er_ctxt->rlen); > + > + seq_printf(m, " rp: 0x%llx wp: 0x%llx", er_ctxt->rp, > + er_ctxt->wp); > + > + seq_printf(m, " local rp: 0x%llx db: 0x%llx\n", (u64)ring->rp, > + mhi_event->db_cfg.db_val); > + } > + > + return 0; > +} > + > +static int mhi_debugfs_channels_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + struct mhi_chan *mhi_chan; > + struct mhi_chan_ctxt *chan_ctxt; > + int i; > + > + if (!mhi_is_active(mhi_cntrl)) { > + seq_puts(m, "Device not ready\n"); > + return -ENODEV; > + } > + > + mhi_chan = mhi_cntrl->mhi_chan; > + chan_ctxt = mhi_cntrl->mhi_ctxt->chan_ctxt; > + for (i = 0; i < mhi_cntrl->max_chan; i++, chan_ctxt++, mhi_chan++) { > + struct mhi_ring *ring = &mhi_chan->tre_ring; > + > + if (mhi_chan->offload_ch) { > + seq_printf(m, "%s(%u) is an offload channel\n", > + mhi_chan->name, mhi_chan->chan); > + continue; > + } > + > + if (!mhi_chan->mhi_dev) > + continue; > + > + seq_printf(m, > + "%s(%u) state: 0x%lx brstmode: 0x%lx pollcfg: 0x%lx", > + mhi_chan->name, mhi_chan->chan, (chan_ctxt->chcfg & > + CHAN_CTX_CHSTATE_MASK) >> CHAN_CTX_CHSTATE_SHIFT, > + (chan_ctxt->chcfg & CHAN_CTX_BRSTMODE_MASK) >> > + CHAN_CTX_BRSTMODE_SHIFT, (chan_ctxt->chcfg & > + CHAN_CTX_POLLCFG_MASK) >> CHAN_CTX_POLLCFG_SHIFT); > + > + seq_printf(m, " type: 0x%x event ring: %u", chan_ctxt->chtype, > + chan_ctxt->erindex); > + > + seq_printf(m, " base: 0x%llx len: 0x%llx wp: 0x%llx", > + chan_ctxt->rbase, chan_ctxt->rlen, chan_ctxt->wp); > + > + seq_printf(m, " local rp: 0x%llx local wp: 0x%llx db: 0x%llx\n", > + (u64)ring->rp, (u64)ring->wp, > + mhi_chan->db_cfg.db_val); > + } > + > + return 0; > +} > + > +static int mhi_device_info_show(struct device *dev, void *data) > +{ > + struct mhi_device *mhi_dev; > + > + if (dev->bus != &mhi_bus_type) > + return 0; > + > + mhi_dev = to_mhi_device(dev); > + > + seq_printf((struct seq_file *)data, "%s: type: %s dev_wake: %u", > + mhi_dev->name, mhi_dev->dev_type ? "Controller" : "Transfer", > + mhi_dev->dev_wake); > + > + /* for transfer device types only */ > + if (mhi_dev->dev_type == MHI_DEVICE_XFER) > + seq_printf((struct seq_file *)data, " channels: %u(UL)/%u(DL)", > + mhi_dev->ul_chan_id, mhi_dev->dl_chan_id); > + > + seq_puts((struct seq_file *)data, "\n"); > + > + return 0; > +} > + > +static int mhi_debugfs_devices_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + > + if (!mhi_is_active(mhi_cntrl)) { > + seq_puts(m, "Device not ready\n"); > + return -ENODEV; > + } > + > + device_for_each_child(mhi_cntrl->cntrl_dev, m, mhi_device_info_show); > + > + return 0; > +} > + > +static int mhi_debugfs_regdump_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + enum mhi_state state; > + enum mhi_ee_type ee; > + int i, ret = -EIO; > + u32 val; > + void __iomem *mhi_base = mhi_cntrl->regs; > + void __iomem *bhi_base = mhi_cntrl->bhi; > + void __iomem *bhie_base = mhi_cntrl->bhie; > + void __iomem *wake_db = mhi_cntrl->wake_db; > + struct { > + const char *name; > + int offset; > + void __iomem *base; > + } regs[] = { > + { "MHI_REGLEN", MHIREGLEN, mhi_base}, > + { "MHI_VER", MHIVER, mhi_base}, > + { "MHI_CFG", MHICFG, mhi_base}, > + { "MHI_CTRL", MHICTRL, mhi_base}, > + { "MHI_STATUS", MHISTATUS, mhi_base}, > + { "MHI_WAKE_DB", 0, wake_db}, > + { "BHI_EXECENV", BHI_EXECENV, bhi_base}, > + { "BHI_STATUS", BHI_STATUS, bhi_base}, > + { "BHI_ERRCODE", BHI_ERRCODE, bhi_base}, > + { "BHI_ERRDBG1", BHI_ERRDBG1, bhi_base}, > + { "BHI_ERRDBG2", BHI_ERRDBG2, bhi_base}, > + { "BHI_ERRDBG3", BHI_ERRDBG3, bhi_base}, > + { "BHIE_TXVEC_DB", BHIE_TXVECDB_OFFS, bhie_base}, > + { "BHIE_TXVEC_STATUS", BHIE_TXVECSTATUS_OFFS, bhie_base}, > + { "BHIE_RXVEC_DB", BHIE_RXVECDB_OFFS, bhie_base}, > + { "BHIE_RXVEC_STATUS", BHIE_RXVECSTATUS_OFFS, bhie_base}, > + { NULL }, > + }; > + > + if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) > + return ret; > + > + seq_printf(m, "Host PM state: %s Device state: %s EE: %s\n", > + to_mhi_pm_state_str(mhi_cntrl->pm_state), > + TO_MHI_STATE_STR(mhi_cntrl->dev_state), > + TO_MHI_EXEC_STR(mhi_cntrl->ee)); > + > + state = mhi_get_mhi_state(mhi_cntrl); > + ee = mhi_get_exec_env(mhi_cntrl); > + seq_printf(m, "Device EE: %s state: %s\n", TO_MHI_EXEC_STR(ee), > + TO_MHI_STATE_STR(state)); > + > + for (i = 0; regs[i].name; i++) { > + if (!regs[i].base) > + continue; > + ret = mhi_read_reg(mhi_cntrl, regs[i].base, regs[i].offset, > + &val); > + if (ret) > + continue; > + > + seq_printf(m, "%s: 0x%x\n", regs[i].name, val); > + } > + > + return 0; > +} > + > +static int mhi_debugfs_device_wake_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; > + > + if (!mhi_is_active(mhi_cntrl)) { > + seq_puts(m, "Device not ready\n"); > + return -ENODEV; > + } > + > + seq_printf(m, > + "Wake count: %d\n%s\n", mhi_dev->dev_wake, > + "Usage: echo get/put > device_wake to vote/unvote for M0"); > + > + return 0; > +} > + > +static ssize_t mhi_debugfs_device_wake_write(struct file *file, > + const char __user *ubuf, > + size_t count, loff_t *ppos) > +{ > + struct seq_file *m = file->private_data; > + struct mhi_controller *mhi_cntrl = m->private; > + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; > + char buf[16]; > + int ret = -EINVAL; > + > + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) > + return -EFAULT; > + > + if (!strncmp(buf, "get", 3)) { > + ret = mhi_device_get_sync(mhi_dev); > + } else if (!strncmp(buf, "put", 3)) { > + mhi_device_put(mhi_dev); > + ret = 0; > + } > + > + return ret ? ret : count; > +} > + > +static int mhi_debugfs_timeout_ms_show(struct seq_file *m, void *d) > +{ > + struct mhi_controller *mhi_cntrl = m->private; > + > + seq_printf(m, "%u ms\n", mhi_cntrl->timeout_ms); > + > + return 0; > +} > + > +static ssize_t mhi_debugfs_timeout_ms_write(struct file *file, > + const char __user *ubuf, > + size_t count, loff_t *ppos) > +{ > + struct seq_file *m = file->private_data; > + struct mhi_controller *mhi_cntrl = m->private; > + u32 timeout_ms; > + > + if (kstrtou32_from_user(ubuf, count, 0, &timeout_ms)) > + return -EINVAL; > + > + mhi_cntrl->timeout_ms = timeout_ms; > + > + return count; > +} > + > +static int mhi_debugfs_states_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_states_show, inode->i_private); > +} > + > +static int mhi_debugfs_events_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_events_show, inode->i_private); > +} > + > +static int mhi_debugfs_channels_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_channels_show, inode->i_private); > +} > + > +static int mhi_debugfs_devices_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_devices_show, inode->i_private); > +} > + > +static int mhi_debugfs_regdump_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_regdump_show, inode->i_private); > +} > + > +static int mhi_debugfs_device_wake_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_device_wake_show, inode->i_private); > +} > + > +static int mhi_debugfs_timeout_ms_open(struct inode *inode, struct file *fp) > +{ > + return single_open(fp, mhi_debugfs_timeout_ms_show, inode->i_private); > +} > + > +static const struct file_operations debugfs_states_fops = { > + .open = mhi_debugfs_states_open, > + .release = single_release, > + .read = seq_read, > +}; > + > +static const struct file_operations debugfs_events_fops = { > + .open = mhi_debugfs_events_open, > + .release = single_release, > + .read = seq_read, > +}; > + > +static const struct file_operations debugfs_channels_fops = { > + .open = mhi_debugfs_channels_open, > + .release = single_release, > + .read = seq_read, > +}; > + > +static const struct file_operations debugfs_devices_fops = { > + .open = mhi_debugfs_devices_open, > + .release = single_release, > + .read = seq_read, > +}; > + > +static const struct file_operations debugfs_regdump_fops = { > + .open = mhi_debugfs_regdump_open, > + .release = single_release, > + .read = seq_read, > +}; > + > +static const struct file_operations debugfs_device_wake_fops = { > + .open = mhi_debugfs_device_wake_open, > + .write = mhi_debugfs_device_wake_write, > + .release = single_release, > + .read = seq_read, > +}; > + > +static const struct file_operations debugfs_timeout_ms_fops = { > + .open = mhi_debugfs_timeout_ms_open, > + .write = mhi_debugfs_timeout_ms_write, > + .release = single_release, > + .read = seq_read, > +}; > + > +static struct dentry *mhi_debugfs_root; > + > +void mhi_create_debugfs(struct mhi_controller *mhi_cntrl) > +{ > + mhi_cntrl->debugfs_dentry = > + debugfs_create_dir(dev_name(mhi_cntrl->cntrl_dev), > + mhi_debugfs_root); > + > + debugfs_create_file("states", 0444, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_states_fops); > + debugfs_create_file("events", 0444, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_events_fops); > + debugfs_create_file("channels", 0444, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_channels_fops); > + debugfs_create_file("devices", 0444, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_devices_fops); > + debugfs_create_file("regdump", 0444, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_regdump_fops); > + debugfs_create_file("device_wake", 0644, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_device_wake_fops); > + debugfs_create_file("timeout_ms", 0644, mhi_cntrl->debugfs_dentry, > + mhi_cntrl, &debugfs_timeout_ms_fops); > +} > + > +void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl) > +{ > + debugfs_remove_recursive(mhi_cntrl->debugfs_dentry); > + mhi_cntrl->debugfs_dentry = NULL; > +} > + > +void mhi_debugfs_init(void) > +{ > + mhi_debugfs_root = debugfs_create_dir(mhi_bus_type.name, NULL); > +} > + > +void mhi_debugfs_exit(void) > +{ > + debugfs_remove_recursive(mhi_debugfs_root); > +} > diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c > index e2011ec..d2c0f6e 100644 > --- a/drivers/bus/mhi/core/init.c > +++ b/drivers/bus/mhi/core/init.c > @@ -4,6 +4,7 @@ > * > */ > > +#include <linux/debugfs.h> > #include <linux/device.h> > #include <linux/dma-direction.h> > #include <linux/dma-mapping.h> > @@ -915,6 +916,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, > > mhi_cntrl->mhi_dev = mhi_dev; > > + mhi_create_debugfs(mhi_cntrl); > + > return 0; > > error_add_dev: > @@ -937,6 +940,8 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl) > struct mhi_chan *mhi_chan = mhi_cntrl->mhi_chan; > unsigned int i; > > + mhi_destroy_debugfs(mhi_cntrl); > + > kfree(mhi_cntrl->mhi_cmd); > kfree(mhi_cntrl->mhi_event); > > @@ -1284,11 +1289,13 @@ struct bus_type mhi_bus_type = { > > static int __init mhi_init(void) > { > + mhi_debugfs_init(); > return bus_register(&mhi_bus_type); > } > > static void __exit mhi_exit(void) > { > + mhi_debugfs_exit(); > bus_unregister(&mhi_bus_type); > } > > diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h > index 5a81a42..7989269 100644 > --- a/drivers/bus/mhi/core/internal.h > +++ b/drivers/bus/mhi/core/internal.h > @@ -570,6 +570,30 @@ struct mhi_chan { > /* Default MHI timeout */ > #define MHI_TIMEOUT_MS (1000) > > +/* debugfs related functions */ > +#ifdef CONFIG_MHI_BUS_DEBUG > +void mhi_create_debugfs(struct mhi_controller *mhi_cntrl); > +void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl); > +void mhi_debugfs_init(void); > +void mhi_debugfs_exit(void); > +#else > +static inline void mhi_create_debugfs(struct mhi_controller *mhi_cntrl) > +{ > +} > + > +static inline void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl) > +{ > +} > + > +static inline void mhi_debugfs_init(void) > +{ > +} > + > +static inline void mhi_debugfs_exit(void) > +{ > +} > +#endif > + > struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl); > > int mhi_destroy_device(struct device *dev, void *data); > diff --git a/include/linux/mhi.h b/include/linux/mhi.h > index d360020..3a3e857 100644 > --- a/include/linux/mhi.h > +++ b/include/linux/mhi.h > @@ -290,6 +290,7 @@ struct mhi_controller_config { > * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI > * controller (required) > * @mhi_dev: MHI device instance for the controller > + * @debugfs_dentry: MHI controller debugfs directory > * @regs: Base address of MHI MMIO register space (required) > * @bhi: Points to base of MHI BHI register space > * @bhie: Points to base of MHI BHIe register space > @@ -367,6 +368,7 @@ struct mhi_controller_config { > struct mhi_controller { > struct device *cntrl_dev; > struct mhi_device *mhi_dev; > + struct dentry *debugfs_dentry; > void __iomem *regs; > void __iomem *bhi; > void __iomem *bhie; > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project >
diff --git a/drivers/bus/mhi/Kconfig b/drivers/bus/mhi/Kconfig index a8bd9bd..6a217ff 100644 --- a/drivers/bus/mhi/Kconfig +++ b/drivers/bus/mhi/Kconfig @@ -12,3 +12,11 @@ config MHI_BUS communication protocol used by the host processors to control and communicate with modem devices over a high speed peripheral bus or shared memory. + +config MHI_BUS_DEBUG + bool "Debugfs support for the MHI bus" + depends on MHI_BUS && DEBUG_FS + help + Enable debugfs support for use with the MHI transport. Allows + reading and/or modifying some values within the MHI controller + for debug and test purposes. diff --git a/drivers/bus/mhi/core/Makefile b/drivers/bus/mhi/core/Makefile index 66e2700..460a548 100644 --- a/drivers/bus/mhi/core/Makefile +++ b/drivers/bus/mhi/core/Makefile @@ -1,3 +1,2 @@ -obj-$(CONFIG_MHI_BUS) := mhi.o - -mhi-y := init.o main.o pm.o boot.o +obj-$(CONFIG_MHI_BUS) := init.o main.o pm.o boot.o +obj-$(CONFIG_MHI_BUS_DEBUG) += debugfs.o diff --git a/drivers/bus/mhi/core/debugfs.c b/drivers/bus/mhi/core/debugfs.c new file mode 100644 index 0000000..a249aa6 --- /dev/null +++ b/drivers/bus/mhi/core/debugfs.c @@ -0,0 +1,409 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2020, The Linux Foundation. All rights reserved. + * + */ + +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/mhi.h> +#include "internal.h" + +static int mhi_debugfs_states_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + + /* states */ + seq_printf(m, "PM state: %s Device: %s MHI state: %s EE: %s wake: %s\n", + to_mhi_pm_state_str(mhi_cntrl->pm_state), + mhi_is_active(mhi_cntrl) ? "Active" : "Inactive", + TO_MHI_STATE_STR(mhi_cntrl->dev_state), + TO_MHI_EXEC_STR(mhi_cntrl->ee), + mhi_cntrl->wake_set ? "true" : "false"); + + /* counters */ + seq_printf(m, "M0: %u M2: %u M3: %u", mhi_cntrl->M0, mhi_cntrl->M2, + mhi_cntrl->M3); + + seq_printf(m, " device wake: %u pending packets: %u\n", + atomic_read(&mhi_cntrl->dev_wake), + atomic_read(&mhi_cntrl->pending_pkts)); + + return 0; +} + +static int mhi_debugfs_events_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_event *mhi_event; + struct mhi_event_ctxt *er_ctxt; + int i; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt; + mhi_event = mhi_cntrl->mhi_event; + for (i = 0; i < mhi_cntrl->total_ev_rings; + i++, er_ctxt++, mhi_event++) { + struct mhi_ring *ring = &mhi_event->ring; + + if (mhi_event->offload_ev) { + seq_printf(m, "Index: %d is an offload event ring\n", + i); + continue; + } + + seq_printf(m, "Index: %d intmod count: %lu time: %lu", + i, (er_ctxt->intmod & EV_CTX_INTMODC_MASK) >> + EV_CTX_INTMODC_SHIFT, + (er_ctxt->intmod & EV_CTX_INTMODT_MASK) >> + EV_CTX_INTMODT_SHIFT); + + seq_printf(m, " base: 0x%0llx len: 0x%llx", er_ctxt->rbase, + er_ctxt->rlen); + + seq_printf(m, " rp: 0x%llx wp: 0x%llx", er_ctxt->rp, + er_ctxt->wp); + + seq_printf(m, " local rp: 0x%llx db: 0x%llx\n", (u64)ring->rp, + mhi_event->db_cfg.db_val); + } + + return 0; +} + +static int mhi_debugfs_channels_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_chan *mhi_chan; + struct mhi_chan_ctxt *chan_ctxt; + int i; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + mhi_chan = mhi_cntrl->mhi_chan; + chan_ctxt = mhi_cntrl->mhi_ctxt->chan_ctxt; + for (i = 0; i < mhi_cntrl->max_chan; i++, chan_ctxt++, mhi_chan++) { + struct mhi_ring *ring = &mhi_chan->tre_ring; + + if (mhi_chan->offload_ch) { + seq_printf(m, "%s(%u) is an offload channel\n", + mhi_chan->name, mhi_chan->chan); + continue; + } + + if (!mhi_chan->mhi_dev) + continue; + + seq_printf(m, + "%s(%u) state: 0x%lx brstmode: 0x%lx pollcfg: 0x%lx", + mhi_chan->name, mhi_chan->chan, (chan_ctxt->chcfg & + CHAN_CTX_CHSTATE_MASK) >> CHAN_CTX_CHSTATE_SHIFT, + (chan_ctxt->chcfg & CHAN_CTX_BRSTMODE_MASK) >> + CHAN_CTX_BRSTMODE_SHIFT, (chan_ctxt->chcfg & + CHAN_CTX_POLLCFG_MASK) >> CHAN_CTX_POLLCFG_SHIFT); + + seq_printf(m, " type: 0x%x event ring: %u", chan_ctxt->chtype, + chan_ctxt->erindex); + + seq_printf(m, " base: 0x%llx len: 0x%llx wp: 0x%llx", + chan_ctxt->rbase, chan_ctxt->rlen, chan_ctxt->wp); + + seq_printf(m, " local rp: 0x%llx local wp: 0x%llx db: 0x%llx\n", + (u64)ring->rp, (u64)ring->wp, + mhi_chan->db_cfg.db_val); + } + + return 0; +} + +static int mhi_device_info_show(struct device *dev, void *data) +{ + struct mhi_device *mhi_dev; + + if (dev->bus != &mhi_bus_type) + return 0; + + mhi_dev = to_mhi_device(dev); + + seq_printf((struct seq_file *)data, "%s: type: %s dev_wake: %u", + mhi_dev->name, mhi_dev->dev_type ? "Controller" : "Transfer", + mhi_dev->dev_wake); + + /* for transfer device types only */ + if (mhi_dev->dev_type == MHI_DEVICE_XFER) + seq_printf((struct seq_file *)data, " channels: %u(UL)/%u(DL)", + mhi_dev->ul_chan_id, mhi_dev->dl_chan_id); + + seq_puts((struct seq_file *)data, "\n"); + + return 0; +} + +static int mhi_debugfs_devices_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + device_for_each_child(mhi_cntrl->cntrl_dev, m, mhi_device_info_show); + + return 0; +} + +static int mhi_debugfs_regdump_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + enum mhi_state state; + enum mhi_ee_type ee; + int i, ret = -EIO; + u32 val; + void __iomem *mhi_base = mhi_cntrl->regs; + void __iomem *bhi_base = mhi_cntrl->bhi; + void __iomem *bhie_base = mhi_cntrl->bhie; + void __iomem *wake_db = mhi_cntrl->wake_db; + struct { + const char *name; + int offset; + void __iomem *base; + } regs[] = { + { "MHI_REGLEN", MHIREGLEN, mhi_base}, + { "MHI_VER", MHIVER, mhi_base}, + { "MHI_CFG", MHICFG, mhi_base}, + { "MHI_CTRL", MHICTRL, mhi_base}, + { "MHI_STATUS", MHISTATUS, mhi_base}, + { "MHI_WAKE_DB", 0, wake_db}, + { "BHI_EXECENV", BHI_EXECENV, bhi_base}, + { "BHI_STATUS", BHI_STATUS, bhi_base}, + { "BHI_ERRCODE", BHI_ERRCODE, bhi_base}, + { "BHI_ERRDBG1", BHI_ERRDBG1, bhi_base}, + { "BHI_ERRDBG2", BHI_ERRDBG2, bhi_base}, + { "BHI_ERRDBG3", BHI_ERRDBG3, bhi_base}, + { "BHIE_TXVEC_DB", BHIE_TXVECDB_OFFS, bhie_base}, + { "BHIE_TXVEC_STATUS", BHIE_TXVECSTATUS_OFFS, bhie_base}, + { "BHIE_RXVEC_DB", BHIE_RXVECDB_OFFS, bhie_base}, + { "BHIE_RXVEC_STATUS", BHIE_RXVECSTATUS_OFFS, bhie_base}, + { NULL }, + }; + + if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) + return ret; + + seq_printf(m, "Host PM state: %s Device state: %s EE: %s\n", + to_mhi_pm_state_str(mhi_cntrl->pm_state), + TO_MHI_STATE_STR(mhi_cntrl->dev_state), + TO_MHI_EXEC_STR(mhi_cntrl->ee)); + + state = mhi_get_mhi_state(mhi_cntrl); + ee = mhi_get_exec_env(mhi_cntrl); + seq_printf(m, "Device EE: %s state: %s\n", TO_MHI_EXEC_STR(ee), + TO_MHI_STATE_STR(state)); + + for (i = 0; regs[i].name; i++) { + if (!regs[i].base) + continue; + ret = mhi_read_reg(mhi_cntrl, regs[i].base, regs[i].offset, + &val); + if (ret) + continue; + + seq_printf(m, "%s: 0x%x\n", regs[i].name, val); + } + + return 0; +} + +static int mhi_debugfs_device_wake_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + + if (!mhi_is_active(mhi_cntrl)) { + seq_puts(m, "Device not ready\n"); + return -ENODEV; + } + + seq_printf(m, + "Wake count: %d\n%s\n", mhi_dev->dev_wake, + "Usage: echo get/put > device_wake to vote/unvote for M0"); + + return 0; +} + +static ssize_t mhi_debugfs_device_wake_write(struct file *file, + const char __user *ubuf, + size_t count, loff_t *ppos) +{ + struct seq_file *m = file->private_data; + struct mhi_controller *mhi_cntrl = m->private; + struct mhi_device *mhi_dev = mhi_cntrl->mhi_dev; + char buf[16]; + int ret = -EINVAL; + + if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) + return -EFAULT; + + if (!strncmp(buf, "get", 3)) { + ret = mhi_device_get_sync(mhi_dev); + } else if (!strncmp(buf, "put", 3)) { + mhi_device_put(mhi_dev); + ret = 0; + } + + return ret ? ret : count; +} + +static int mhi_debugfs_timeout_ms_show(struct seq_file *m, void *d) +{ + struct mhi_controller *mhi_cntrl = m->private; + + seq_printf(m, "%u ms\n", mhi_cntrl->timeout_ms); + + return 0; +} + +static ssize_t mhi_debugfs_timeout_ms_write(struct file *file, + const char __user *ubuf, + size_t count, loff_t *ppos) +{ + struct seq_file *m = file->private_data; + struct mhi_controller *mhi_cntrl = m->private; + u32 timeout_ms; + + if (kstrtou32_from_user(ubuf, count, 0, &timeout_ms)) + return -EINVAL; + + mhi_cntrl->timeout_ms = timeout_ms; + + return count; +} + +static int mhi_debugfs_states_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_states_show, inode->i_private); +} + +static int mhi_debugfs_events_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_events_show, inode->i_private); +} + +static int mhi_debugfs_channels_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_channels_show, inode->i_private); +} + +static int mhi_debugfs_devices_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_devices_show, inode->i_private); +} + +static int mhi_debugfs_regdump_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_regdump_show, inode->i_private); +} + +static int mhi_debugfs_device_wake_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_device_wake_show, inode->i_private); +} + +static int mhi_debugfs_timeout_ms_open(struct inode *inode, struct file *fp) +{ + return single_open(fp, mhi_debugfs_timeout_ms_show, inode->i_private); +} + +static const struct file_operations debugfs_states_fops = { + .open = mhi_debugfs_states_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_events_fops = { + .open = mhi_debugfs_events_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_channels_fops = { + .open = mhi_debugfs_channels_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_devices_fops = { + .open = mhi_debugfs_devices_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_regdump_fops = { + .open = mhi_debugfs_regdump_open, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_device_wake_fops = { + .open = mhi_debugfs_device_wake_open, + .write = mhi_debugfs_device_wake_write, + .release = single_release, + .read = seq_read, +}; + +static const struct file_operations debugfs_timeout_ms_fops = { + .open = mhi_debugfs_timeout_ms_open, + .write = mhi_debugfs_timeout_ms_write, + .release = single_release, + .read = seq_read, +}; + +static struct dentry *mhi_debugfs_root; + +void mhi_create_debugfs(struct mhi_controller *mhi_cntrl) +{ + mhi_cntrl->debugfs_dentry = + debugfs_create_dir(dev_name(mhi_cntrl->cntrl_dev), + mhi_debugfs_root); + + debugfs_create_file("states", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_states_fops); + debugfs_create_file("events", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_events_fops); + debugfs_create_file("channels", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_channels_fops); + debugfs_create_file("devices", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_devices_fops); + debugfs_create_file("regdump", 0444, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_regdump_fops); + debugfs_create_file("device_wake", 0644, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_device_wake_fops); + debugfs_create_file("timeout_ms", 0644, mhi_cntrl->debugfs_dentry, + mhi_cntrl, &debugfs_timeout_ms_fops); +} + +void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl) +{ + debugfs_remove_recursive(mhi_cntrl->debugfs_dentry); + mhi_cntrl->debugfs_dentry = NULL; +} + +void mhi_debugfs_init(void) +{ + mhi_debugfs_root = debugfs_create_dir(mhi_bus_type.name, NULL); +} + +void mhi_debugfs_exit(void) +{ + debugfs_remove_recursive(mhi_debugfs_root); +} diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index e2011ec..d2c0f6e 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -4,6 +4,7 @@ * */ +#include <linux/debugfs.h> #include <linux/device.h> #include <linux/dma-direction.h> #include <linux/dma-mapping.h> @@ -915,6 +916,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, mhi_cntrl->mhi_dev = mhi_dev; + mhi_create_debugfs(mhi_cntrl); + return 0; error_add_dev: @@ -937,6 +940,8 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl) struct mhi_chan *mhi_chan = mhi_cntrl->mhi_chan; unsigned int i; + mhi_destroy_debugfs(mhi_cntrl); + kfree(mhi_cntrl->mhi_cmd); kfree(mhi_cntrl->mhi_event); @@ -1284,11 +1289,13 @@ struct bus_type mhi_bus_type = { static int __init mhi_init(void) { + mhi_debugfs_init(); return bus_register(&mhi_bus_type); } static void __exit mhi_exit(void) { + mhi_debugfs_exit(); bus_unregister(&mhi_bus_type); } diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 5a81a42..7989269 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -570,6 +570,30 @@ struct mhi_chan { /* Default MHI timeout */ #define MHI_TIMEOUT_MS (1000) +/* debugfs related functions */ +#ifdef CONFIG_MHI_BUS_DEBUG +void mhi_create_debugfs(struct mhi_controller *mhi_cntrl); +void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl); +void mhi_debugfs_init(void); +void mhi_debugfs_exit(void); +#else +static inline void mhi_create_debugfs(struct mhi_controller *mhi_cntrl) +{ +} + +static inline void mhi_destroy_debugfs(struct mhi_controller *mhi_cntrl) +{ +} + +static inline void mhi_debugfs_init(void) +{ +} + +static inline void mhi_debugfs_exit(void) +{ +} +#endif + struct mhi_device *mhi_alloc_device(struct mhi_controller *mhi_cntrl); int mhi_destroy_device(struct device *dev, void *data); diff --git a/include/linux/mhi.h b/include/linux/mhi.h index d360020..3a3e857 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -290,6 +290,7 @@ struct mhi_controller_config { * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI * controller (required) * @mhi_dev: MHI device instance for the controller + * @debugfs_dentry: MHI controller debugfs directory * @regs: Base address of MHI MMIO register space (required) * @bhi: Points to base of MHI BHI register space * @bhie: Points to base of MHI BHIe register space @@ -367,6 +368,7 @@ struct mhi_controller_config { struct mhi_controller { struct device *cntrl_dev; struct mhi_device *mhi_dev; + struct dentry *debugfs_dentry; void __iomem *regs; void __iomem *bhi; void __iomem *bhie;
Introduce debugfs entries to show state, register, channel, device, and event rings information. Allow the host to dump registers, issue device wake, and change the MHI timeout to help in debug. Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org> --- drivers/bus/mhi/Kconfig | 8 + drivers/bus/mhi/core/Makefile | 5 +- drivers/bus/mhi/core/debugfs.c | 409 ++++++++++++++++++++++++++++++++++++++++ drivers/bus/mhi/core/init.c | 7 + drivers/bus/mhi/core/internal.h | 24 +++ include/linux/mhi.h | 2 + 6 files changed, 452 insertions(+), 3 deletions(-) create mode 100644 drivers/bus/mhi/core/debugfs.c