# # gdb helper commands and functions for Linux kernel debugging # # kernel log buffer dump # # Copyright (c) Siemens AG, 2011, 2012 # # Authors: # Jan Kiszka # # This work is licensed under the terms of the GNU GPL version 2. # import gdb import sys from linux import utils printk_info_type = utils.CachedType("struct printk_info") prb_data_blk_lpos_type = utils.CachedType("struct prb_data_blk_lpos") prb_desc_type = utils.CachedType("struct prb_desc") prb_desc_ring_type = utils.CachedType("struct prb_desc_ring") prb_data_ring_type = utils.CachedType("struct prb_data_ring") printk_ringbuffer_type = utils.CachedType("struct printk_ringbuffer") class LxDmesg(gdb.Command): """Print Linux kernel log buffer.""" def __init__(self): super(LxDmesg, self).__init__("lx-dmesg", gdb.COMMAND_DATA) def invoke(self, arg, from_tty): inf = gdb.inferiors()[0] # read in prb structure prb_addr = int(str(gdb.parse_and_eval("(void *)'printk.c'::prb")).split()[0], 16) sz = printk_ringbuffer_type.get_type().sizeof prb = utils.read_memoryview(inf, prb_addr, sz).tobytes() # read in descriptor ring structure off = printk_ringbuffer_type.get_type()['desc_ring'].bitpos // 8 addr = prb_addr + off sz = prb_desc_ring_type.get_type().sizeof desc_ring = utils.read_memoryview(inf, addr, sz).tobytes() # read in descriptor count, size, and address off = prb_desc_ring_type.get_type()['count_bits'].bitpos // 8 desc_ring_count = 1 << utils.read_u32(desc_ring, off) desc_sz = prb_desc_type.get_type().sizeof off = prb_desc_ring_type.get_type()['descs'].bitpos // 8 desc_addr = utils.read_ulong(desc_ring, off) # read in info size and address info_sz = printk_info_type.get_type().sizeof off = prb_desc_ring_type.get_type()['infos'].bitpos // 8 info_addr = utils.read_ulong(desc_ring, off) # read in text data ring structure off = printk_ringbuffer_type.get_type()['text_data_ring'].bitpos // 8 addr = prb_addr + off sz = prb_data_ring_type.get_type().sizeof text_data_ring = utils.read_memoryview(inf, addr, sz).tobytes() # read in text data size and address off = prb_data_ring_type.get_type()['size_bits'].bitpos // 8 text_data_sz = 1 << utils.read_u32(text_data_ring, off) off = prb_data_ring_type.get_type()['data'].bitpos // 8 text_data_addr = utils.read_ulong(text_data_ring, off) sv_off = prb_desc_type.get_type()['state_var'].bitpos // 8 off = prb_desc_type.get_type()['text_blk_lpos'].bitpos // 8 begin_off = off + (prb_data_blk_lpos_type.get_type()['begin'].bitpos // 8) next_off = off + (prb_data_blk_lpos_type.get_type()['next'].bitpos // 8) ts_off = printk_info_type.get_type()['ts_nsec'].bitpos // 8 len_off = printk_info_type.get_type()['text_len'].bitpos // 8 # definitions from kernel/printk/printk_ringbuffer.h desc_committed = 1 desc_finalized = 2 desc_sv_bits = utils.get_long_type().sizeof * 8 desc_flags_shift = desc_sv_bits - 2 desc_flags_mask = 3 << desc_flags_shift desc_id_mask = ~desc_flags_mask # read in tail and head descriptor ids off = prb_desc_ring_type.get_type()['tail_id'].bitpos // 8 tail_id = utils.read_atomic_long(desc_ring, off) off = prb_desc_ring_type.get_type()['head_id'].bitpos // 8 head_id = utils.read_atomic_long(desc_ring, off) did = tail_id while True: ind = did % desc_ring_count desc_off = desc_sz * ind info_off = info_sz * ind desc = utils.read_memoryview(inf, desc_addr + desc_off, desc_sz).tobytes() # skip non-committed record state = 3 & (utils.read_atomic_long(desc, sv_off) >> desc_flags_shift) if state != desc_committed and state != desc_finalized: if did == head_id: break did = (did + 1) & desc_id_mask continue begin = utils.read_ulong(desc, begin_off) % text_data_sz end = utils.read_ulong(desc, next_off) % text_data_sz info = utils.read_memoryview(inf, info_addr + info_off, info_sz).tobytes() # handle data-less record if begin & 1 == 1: text = "" else: # handle wrapping data block if begin > end: begin = 0 # skip over descriptor id text_start = begin + utils.get_long_type().sizeof text_len = utils.read_u16(info, len_off) # handle truncated message if end - text_start < text_len: text_len = end - text_start text_data = utils.read_memoryview(inf, text_data_addr + text_start, text_len).tobytes() text = text_data[0:text_len].decode(encoding='utf8', errors='replace') time_stamp = utils.read_u64(info, ts_off) for line in text.splitlines(): msg = u"[{time:12.6f}] {line}\n".format( time=time_stamp / 1000000000.0, line=line) # With python2 gdb.write will attempt to convert unicode to # ascii and might fail so pass an utf8-encoded str instead. if sys.hexversion < 0x03000000: msg = msg.encode(encoding='utf8', errors='replace') gdb.write(msg) if did == head_id: break did = (did + 1) & desc_id_mask LxDmesg() supportSasha Neftin commit 9513d2a5dc7f ("igc: Add legacy power management support") Add power management resume and schedule suspend requests. Add power management get and put synchronization. Signed-off-by: Sasha Neftin <sasha.neftin@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> 2020-02-19igc: make non-global functions staticChen Zhou Fix sparse warning: drivers/net/ethernet/intel/igc/igc_ptp.c:512:6: warning: symbol 'igc_ptp_tx_work' was not declared. Should it be static? drivers/net/ethernet/intel/igc/igc_ptp.c:644:6: warning: symbol 'igc_ptp_suspend' was not declared. Should it be static? Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Chen Zhou <chenzhou10@huawei.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> 2020-02-19net: intel: e1000e: fix possible sleep-in-atomic-context bugs in ↵Jia-Ju Bai e1000e_get_hw_semaphore() The driver may sleep while holding a spinlock. The function call path (from bottom to top) in Linux 4.19 is: drivers/net/ethernet/intel/e1000e/mac.c, 1366: usleep_range in e1000e_get_hw_semaphore drivers/net/ethernet/intel/e1000e/80003es2lan.c, 322: e1000e_get_hw_semaphore in e1000_release_swfw_sync_80003es2lan drivers/net/ethernet/intel/e1000e/80003es2lan.c, 197: e1000_release_swfw_sync_80003es2lan in e1000_release_phy_80003es2lan drivers/net/ethernet/intel/e1000e/netdev.c, 4883: (FUNC_PTR) e1000_release_phy_80003es2lan in e1000e_update_phy_stats drivers/net/ethernet/intel/e1000e/netdev.c, 4917: e1000e_update_phy_stats in e1000e_update_stats drivers/net/ethernet/intel/e1000e/netdev.c, 5945: e1000e_update_stats in e1000e_get_stats64 drivers/net/ethernet/intel/e1000e/netdev.c, 5944: spin_lock in e1000e_get_stats64 drivers/net/ethernet/intel/e1000e/mac.c, 1384: usleep_range in e1000e_get_hw_semaphore drivers/net/ethernet/intel/e1000e/80003es2lan.c, 322: e1000e_get_hw_semaphore in e1000_release_swfw_sync_80003es2lan drivers/net/ethernet/intel/e1000e/80003es2lan.c, 197: e1000_release_swfw_sync_80003es2lan in e1000_release_phy_80003es2lan drivers/net/ethernet/intel/e1000e/netdev.c, 4883: (FUNC_PTR) e1000_release_phy_80003es2lan in e1000e_update_phy_stats drivers/net/ethernet/intel/e1000e/netdev.c, 4917: e1000e_update_phy_stats in e1000e_update_stats drivers/net/ethernet/intel/e1000e/netdev.c, 5945: e1000e_update_stats in e1000e_get_stats64 drivers/net/ethernet/intel/e1000e/netdev.c, 5944: spin_lock in e1000e_get_stats64 (FUNC_PTR) means a function pointer is called. To fix these bugs, usleep_range() is replaced with udelay(). These bugs are found by a static analysis tool STCheck written by myself. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> 2020-02-19e1000e: fix missing cpu_to_le64 on buffer_addrBen Dooks (Codethink) The following warning suggests there is a missing cpu_to_le64() in the e1000_flush_tx_ring() function (it is also the behaviour elsewhere in the driver to do cpu_to_le64() on the buffer_addr when setting it) drivers/net/ethernet/intel/e1000e/netdev.c:3813:30: warning: incorrect type in assignment (different base types) drivers/net/ethernet/intel/e1000e/netdev.c:3813:30: expected restricted __le64 [usertype] buffer_addr drivers/net/ethernet/intel/e1000e/netdev.c:3813:30: got unsigned long long [usertype] dma Signed-off-by: Ben Dooks (Codethink) <ben.dooks@codethink.co.uk> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> 2020-02-19net: mvneta: align xdp stats naming scheme to mlx5 driverLorenzo Bianconi Introduce "rx" prefix in the name scheme for xdp counters on rx path. Differentiate between XDP_TX and ndo_xdp_xmit counters Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>