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![Chris Wilson](/assets/img/avatar_default.png)
If the user is clearing the log buffer too slowly, we overflow. As this is an expected condition, and the driver tries to handle it, reduce the error message down to a notice. Michal mentioned that another cause would be incorrect reset handling, so we don't want to lose the notification entirely. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110817 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190617100917.13110-1-chris@chris-wilson.co.uk
632 lines
17 KiB
C
632 lines
17 KiB
C
/*
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* Copyright © 2014-2017 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include <linux/debugfs.h>
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#include "intel_guc_log.h"
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#include "i915_drv.h"
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static void guc_log_capture_logs(struct intel_guc_log *log);
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/**
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* DOC: GuC firmware log
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*
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* Firmware log is enabled by setting i915.guc_log_level to the positive level.
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* Log data is printed out via reading debugfs i915_guc_log_dump. Reading from
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* i915_guc_load_status will print out firmware loading status and scratch
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* registers value.
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*/
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static int guc_action_flush_log_complete(struct intel_guc *guc)
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{
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u32 action[] = {
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INTEL_GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE
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};
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return intel_guc_send(guc, action, ARRAY_SIZE(action));
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}
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static int guc_action_flush_log(struct intel_guc *guc)
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{
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u32 action[] = {
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INTEL_GUC_ACTION_FORCE_LOG_BUFFER_FLUSH,
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0
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};
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return intel_guc_send(guc, action, ARRAY_SIZE(action));
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}
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static int guc_action_control_log(struct intel_guc *guc, bool enable,
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bool default_logging, u32 verbosity)
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{
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u32 action[] = {
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INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING,
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(enable ? GUC_LOG_CONTROL_LOGGING_ENABLED : 0) |
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(verbosity << GUC_LOG_CONTROL_VERBOSITY_SHIFT) |
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(default_logging ? GUC_LOG_CONTROL_DEFAULT_LOGGING : 0)
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};
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GEM_BUG_ON(verbosity > GUC_LOG_VERBOSITY_MAX);
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return intel_guc_send(guc, action, ARRAY_SIZE(action));
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}
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static inline struct intel_guc *log_to_guc(struct intel_guc_log *log)
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{
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return container_of(log, struct intel_guc, log);
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}
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static void guc_log_enable_flush_events(struct intel_guc_log *log)
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{
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intel_guc_enable_msg(log_to_guc(log),
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INTEL_GUC_RECV_MSG_FLUSH_LOG_BUFFER |
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INTEL_GUC_RECV_MSG_CRASH_DUMP_POSTED);
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}
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static void guc_log_disable_flush_events(struct intel_guc_log *log)
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{
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intel_guc_disable_msg(log_to_guc(log),
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INTEL_GUC_RECV_MSG_FLUSH_LOG_BUFFER |
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INTEL_GUC_RECV_MSG_CRASH_DUMP_POSTED);
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}
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/*
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* Sub buffer switch callback. Called whenever relay has to switch to a new
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* sub buffer, relay stays on the same sub buffer if 0 is returned.
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*/
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static int subbuf_start_callback(struct rchan_buf *buf,
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void *subbuf,
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void *prev_subbuf,
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size_t prev_padding)
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{
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/*
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* Use no-overwrite mode by default, where relay will stop accepting
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* new data if there are no empty sub buffers left.
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* There is no strict synchronization enforced by relay between Consumer
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* and Producer. In overwrite mode, there is a possibility of getting
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* inconsistent/garbled data, the producer could be writing on to the
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* same sub buffer from which Consumer is reading. This can't be avoided
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* unless Consumer is fast enough and can always run in tandem with
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* Producer.
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*/
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if (relay_buf_full(buf))
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return 0;
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return 1;
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}
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/*
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* file_create() callback. Creates relay file in debugfs.
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*/
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static struct dentry *create_buf_file_callback(const char *filename,
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struct dentry *parent,
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umode_t mode,
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struct rchan_buf *buf,
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int *is_global)
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{
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struct dentry *buf_file;
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/*
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* This to enable the use of a single buffer for the relay channel and
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* correspondingly have a single file exposed to User, through which
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* it can collect the logs in order without any post-processing.
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* Need to set 'is_global' even if parent is NULL for early logging.
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*/
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*is_global = 1;
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if (!parent)
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return NULL;
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buf_file = debugfs_create_file(filename, mode,
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parent, buf, &relay_file_operations);
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if (IS_ERR(buf_file))
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return NULL;
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return buf_file;
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}
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/*
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* file_remove() default callback. Removes relay file in debugfs.
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*/
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static int remove_buf_file_callback(struct dentry *dentry)
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{
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debugfs_remove(dentry);
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return 0;
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}
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/* relay channel callbacks */
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static struct rchan_callbacks relay_callbacks = {
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.subbuf_start = subbuf_start_callback,
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.create_buf_file = create_buf_file_callback,
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.remove_buf_file = remove_buf_file_callback,
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};
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static void guc_move_to_next_buf(struct intel_guc_log *log)
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{
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/*
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* Make sure the updates made in the sub buffer are visible when
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* Consumer sees the following update to offset inside the sub buffer.
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*/
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smp_wmb();
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/* All data has been written, so now move the offset of sub buffer. */
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relay_reserve(log->relay.channel, log->vma->obj->base.size);
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/* Switch to the next sub buffer */
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relay_flush(log->relay.channel);
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}
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static void *guc_get_write_buffer(struct intel_guc_log *log)
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{
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/*
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* Just get the base address of a new sub buffer and copy data into it
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* ourselves. NULL will be returned in no-overwrite mode, if all sub
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* buffers are full. Could have used the relay_write() to indirectly
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* copy the data, but that would have been bit convoluted, as we need to
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* write to only certain locations inside a sub buffer which cannot be
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* done without using relay_reserve() along with relay_write(). So its
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* better to use relay_reserve() alone.
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*/
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return relay_reserve(log->relay.channel, 0);
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}
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static bool guc_check_log_buf_overflow(struct intel_guc_log *log,
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enum guc_log_buffer_type type,
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unsigned int full_cnt)
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{
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unsigned int prev_full_cnt = log->stats[type].sampled_overflow;
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bool overflow = false;
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if (full_cnt != prev_full_cnt) {
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overflow = true;
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log->stats[type].overflow = full_cnt;
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log->stats[type].sampled_overflow += full_cnt - prev_full_cnt;
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if (full_cnt < prev_full_cnt) {
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/* buffer_full_cnt is a 4 bit counter */
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log->stats[type].sampled_overflow += 16;
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}
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dev_notice_ratelimited(guc_to_i915(log_to_guc(log))->drm.dev,
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"GuC log buffer overflow\n");
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}
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return overflow;
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}
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static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type)
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{
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switch (type) {
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case GUC_ISR_LOG_BUFFER:
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return ISR_BUFFER_SIZE;
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case GUC_DPC_LOG_BUFFER:
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return DPC_BUFFER_SIZE;
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case GUC_CRASH_DUMP_LOG_BUFFER:
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return CRASH_BUFFER_SIZE;
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default:
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MISSING_CASE(type);
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}
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return 0;
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}
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static void guc_read_update_log_buffer(struct intel_guc_log *log)
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{
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unsigned int buffer_size, read_offset, write_offset, bytes_to_copy, full_cnt;
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struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state;
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struct guc_log_buffer_state log_buf_state_local;
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enum guc_log_buffer_type type;
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void *src_data, *dst_data;
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bool new_overflow;
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mutex_lock(&log->relay.lock);
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if (WARN_ON(!intel_guc_log_relay_enabled(log)))
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goto out_unlock;
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/* Get the pointer to shared GuC log buffer */
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log_buf_state = src_data = log->relay.buf_addr;
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/* Get the pointer to local buffer to store the logs */
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log_buf_snapshot_state = dst_data = guc_get_write_buffer(log);
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if (unlikely(!log_buf_snapshot_state)) {
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/*
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* Used rate limited to avoid deluge of messages, logs might be
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* getting consumed by User at a slow rate.
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*/
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DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n");
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log->relay.full_count++;
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goto out_unlock;
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}
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/* Actual logs are present from the 2nd page */
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src_data += PAGE_SIZE;
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dst_data += PAGE_SIZE;
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for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
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/*
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* Make a copy of the state structure, inside GuC log buffer
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* (which is uncached mapped), on the stack to avoid reading
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* from it multiple times.
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*/
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memcpy(&log_buf_state_local, log_buf_state,
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sizeof(struct guc_log_buffer_state));
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buffer_size = guc_get_log_buffer_size(type);
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read_offset = log_buf_state_local.read_ptr;
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write_offset = log_buf_state_local.sampled_write_ptr;
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full_cnt = log_buf_state_local.buffer_full_cnt;
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/* Bookkeeping stuff */
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log->stats[type].flush += log_buf_state_local.flush_to_file;
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new_overflow = guc_check_log_buf_overflow(log, type, full_cnt);
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/* Update the state of shared log buffer */
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log_buf_state->read_ptr = write_offset;
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log_buf_state->flush_to_file = 0;
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log_buf_state++;
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/* First copy the state structure in snapshot buffer */
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memcpy(log_buf_snapshot_state, &log_buf_state_local,
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sizeof(struct guc_log_buffer_state));
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/*
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* The write pointer could have been updated by GuC firmware,
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* after sending the flush interrupt to Host, for consistency
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* set write pointer value to same value of sampled_write_ptr
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* in the snapshot buffer.
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*/
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log_buf_snapshot_state->write_ptr = write_offset;
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log_buf_snapshot_state++;
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/* Now copy the actual logs. */
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if (unlikely(new_overflow)) {
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/* copy the whole buffer in case of overflow */
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read_offset = 0;
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write_offset = buffer_size;
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} else if (unlikely((read_offset > buffer_size) ||
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(write_offset > buffer_size))) {
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DRM_ERROR("invalid log buffer state\n");
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/* copy whole buffer as offsets are unreliable */
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read_offset = 0;
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write_offset = buffer_size;
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}
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/* Just copy the newly written data */
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if (read_offset > write_offset) {
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i915_memcpy_from_wc(dst_data, src_data, write_offset);
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bytes_to_copy = buffer_size - read_offset;
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} else {
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bytes_to_copy = write_offset - read_offset;
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}
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i915_memcpy_from_wc(dst_data + read_offset,
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src_data + read_offset, bytes_to_copy);
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src_data += buffer_size;
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dst_data += buffer_size;
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}
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guc_move_to_next_buf(log);
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out_unlock:
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mutex_unlock(&log->relay.lock);
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}
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static void capture_logs_work(struct work_struct *work)
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{
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struct intel_guc_log *log =
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container_of(work, struct intel_guc_log, relay.flush_work);
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guc_log_capture_logs(log);
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}
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static int guc_log_map(struct intel_guc_log *log)
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{
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void *vaddr;
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lockdep_assert_held(&log->relay.lock);
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if (!log->vma)
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return -ENODEV;
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/*
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* Create a WC (Uncached for read) vmalloc mapping of log
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* buffer pages, so that we can directly get the data
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* (up-to-date) from memory.
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*/
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vaddr = i915_gem_object_pin_map(log->vma->obj, I915_MAP_WC);
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if (IS_ERR(vaddr))
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return PTR_ERR(vaddr);
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log->relay.buf_addr = vaddr;
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return 0;
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}
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static void guc_log_unmap(struct intel_guc_log *log)
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{
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lockdep_assert_held(&log->relay.lock);
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i915_gem_object_unpin_map(log->vma->obj);
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log->relay.buf_addr = NULL;
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}
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void intel_guc_log_init_early(struct intel_guc_log *log)
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{
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mutex_init(&log->relay.lock);
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INIT_WORK(&log->relay.flush_work, capture_logs_work);
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}
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static int guc_log_relay_create(struct intel_guc_log *log)
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{
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struct intel_guc *guc = log_to_guc(log);
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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struct rchan *guc_log_relay_chan;
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size_t n_subbufs, subbuf_size;
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int ret;
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lockdep_assert_held(&log->relay.lock);
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/* Keep the size of sub buffers same as shared log buffer */
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subbuf_size = log->vma->size;
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/*
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* Store up to 8 snapshots, which is large enough to buffer sufficient
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* boot time logs and provides enough leeway to User, in terms of
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* latency, for consuming the logs from relay. Also doesn't take
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* up too much memory.
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*/
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n_subbufs = 8;
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guc_log_relay_chan = relay_open("guc_log",
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dev_priv->drm.primary->debugfs_root,
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subbuf_size, n_subbufs,
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&relay_callbacks, dev_priv);
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if (!guc_log_relay_chan) {
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DRM_ERROR("Couldn't create relay chan for GuC logging\n");
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ret = -ENOMEM;
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return ret;
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}
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GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size);
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log->relay.channel = guc_log_relay_chan;
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return 0;
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}
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static void guc_log_relay_destroy(struct intel_guc_log *log)
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{
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lockdep_assert_held(&log->relay.lock);
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relay_close(log->relay.channel);
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log->relay.channel = NULL;
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}
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static void guc_log_capture_logs(struct intel_guc_log *log)
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{
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struct intel_guc *guc = log_to_guc(log);
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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intel_wakeref_t wakeref;
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guc_read_update_log_buffer(log);
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/*
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* Generally device is expected to be active only at this
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* time, so get/put should be really quick.
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*/
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with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref)
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guc_action_flush_log_complete(guc);
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}
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int intel_guc_log_create(struct intel_guc_log *log)
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{
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struct intel_guc *guc = log_to_guc(log);
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struct i915_vma *vma;
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u32 guc_log_size;
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int ret;
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GEM_BUG_ON(log->vma);
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/*
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* GuC Log buffer Layout
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*
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* +===============================+ 00B
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* | Crash dump state header |
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* +-------------------------------+ 32B
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* | DPC state header |
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* +-------------------------------+ 64B
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* | ISR state header |
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* +-------------------------------+ 96B
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* | |
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* +===============================+ PAGE_SIZE (4KB)
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* | Crash Dump logs |
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* +===============================+ + CRASH_SIZE
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* | DPC logs |
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* +===============================+ + DPC_SIZE
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* | ISR logs |
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* +===============================+ + ISR_SIZE
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*/
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guc_log_size = PAGE_SIZE + CRASH_BUFFER_SIZE + DPC_BUFFER_SIZE +
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ISR_BUFFER_SIZE;
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vma = intel_guc_allocate_vma(guc, guc_log_size);
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if (IS_ERR(vma)) {
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ret = PTR_ERR(vma);
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goto err;
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}
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log->vma = vma;
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log->level = i915_modparams.guc_log_level;
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return 0;
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err:
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DRM_ERROR("Failed to allocate GuC log buffer. %d\n", ret);
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return ret;
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}
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void intel_guc_log_destroy(struct intel_guc_log *log)
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|
{
|
|
i915_vma_unpin_and_release(&log->vma, 0);
|
|
}
|
|
|
|
int intel_guc_log_set_level(struct intel_guc_log *log, u32 level)
|
|
{
|
|
struct intel_guc *guc = log_to_guc(log);
|
|
struct drm_i915_private *dev_priv = guc_to_i915(guc);
|
|
intel_wakeref_t wakeref;
|
|
int ret = 0;
|
|
|
|
BUILD_BUG_ON(GUC_LOG_VERBOSITY_MIN != 0);
|
|
GEM_BUG_ON(!log->vma);
|
|
|
|
/*
|
|
* GuC is recognizing log levels starting from 0 to max, we're using 0
|
|
* as indication that logging should be disabled.
|
|
*/
|
|
if (level < GUC_LOG_LEVEL_DISABLED || level > GUC_LOG_LEVEL_MAX)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&dev_priv->drm.struct_mutex);
|
|
|
|
if (log->level == level)
|
|
goto out_unlock;
|
|
|
|
with_intel_runtime_pm(&dev_priv->runtime_pm, wakeref)
|
|
ret = guc_action_control_log(guc,
|
|
GUC_LOG_LEVEL_IS_VERBOSE(level),
|
|
GUC_LOG_LEVEL_IS_ENABLED(level),
|
|
GUC_LOG_LEVEL_TO_VERBOSITY(level));
|
|
if (ret) {
|
|
DRM_DEBUG_DRIVER("guc_log_control action failed %d\n", ret);
|
|
goto out_unlock;
|
|
}
|
|
|
|
log->level = level;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&dev_priv->drm.struct_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool intel_guc_log_relay_enabled(const struct intel_guc_log *log)
|
|
{
|
|
return log->relay.buf_addr;
|
|
}
|
|
|
|
int intel_guc_log_relay_open(struct intel_guc_log *log)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&log->relay.lock);
|
|
|
|
if (intel_guc_log_relay_enabled(log)) {
|
|
ret = -EEXIST;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* We require SSE 4.1 for fast reads from the GuC log buffer and
|
|
* it should be present on the chipsets supporting GuC based
|
|
* submisssions.
|
|
*/
|
|
if (!i915_has_memcpy_from_wc()) {
|
|
ret = -ENXIO;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = guc_log_relay_create(log);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
ret = guc_log_map(log);
|
|
if (ret)
|
|
goto out_relay;
|
|
|
|
mutex_unlock(&log->relay.lock);
|
|
|
|
guc_log_enable_flush_events(log);
|
|
|
|
/*
|
|
* When GuC is logging without us relaying to userspace, we're ignoring
|
|
* the flush notification. This means that we need to unconditionally
|
|
* flush on relay enabling, since GuC only notifies us once.
|
|
*/
|
|
queue_work(log->relay.flush_wq, &log->relay.flush_work);
|
|
|
|
return 0;
|
|
|
|
out_relay:
|
|
guc_log_relay_destroy(log);
|
|
out_unlock:
|
|
mutex_unlock(&log->relay.lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void intel_guc_log_relay_flush(struct intel_guc_log *log)
|
|
{
|
|
struct intel_guc *guc = log_to_guc(log);
|
|
struct drm_i915_private *i915 = guc_to_i915(guc);
|
|
intel_wakeref_t wakeref;
|
|
|
|
/*
|
|
* Before initiating the forceful flush, wait for any pending/ongoing
|
|
* flush to complete otherwise forceful flush may not actually happen.
|
|
*/
|
|
flush_work(&log->relay.flush_work);
|
|
|
|
with_intel_runtime_pm(&i915->runtime_pm, wakeref)
|
|
guc_action_flush_log(guc);
|
|
|
|
/* GuC would have updated log buffer by now, so capture it */
|
|
guc_log_capture_logs(log);
|
|
}
|
|
|
|
void intel_guc_log_relay_close(struct intel_guc_log *log)
|
|
{
|
|
struct intel_guc *guc = log_to_guc(log);
|
|
struct drm_i915_private *i915 = guc_to_i915(guc);
|
|
|
|
guc_log_disable_flush_events(log);
|
|
synchronize_irq(i915->drm.irq);
|
|
|
|
flush_work(&log->relay.flush_work);
|
|
|
|
mutex_lock(&log->relay.lock);
|
|
GEM_BUG_ON(!intel_guc_log_relay_enabled(log));
|
|
guc_log_unmap(log);
|
|
guc_log_relay_destroy(log);
|
|
mutex_unlock(&log->relay.lock);
|
|
}
|
|
|
|
void intel_guc_log_handle_flush_event(struct intel_guc_log *log)
|
|
{
|
|
queue_work(log->relay.flush_wq, &log->relay.flush_work);
|
|
}
|