mirror of https://gitee.com/openkylin/linux.git
669 lines
19 KiB
C
669 lines
19 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 <linux/relay.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 *guc);
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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 non-negative 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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*/
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static int guc_log_flush_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_log_flush(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_log_control(struct intel_guc *guc, u32 control_val)
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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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control_val
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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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/*
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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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/* 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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/* 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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/* Not using the channel filename passed as an argument, since for each
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* channel relay appends the corresponding CPU number to the filename
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* passed in relay_open(). This should be fine as relay just needs a
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* dentry of the file associated with the channel buffer and that file's
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* name need not be same as the filename passed as an argument.
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*/
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buf_file = debugfs_create_file("guc_log", mode,
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parent, buf, &relay_file_operations);
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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 int guc_log_relay_file_create(struct intel_guc *guc)
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{
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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struct dentry *log_dir;
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int ret;
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if (i915_modparams.guc_log_level < 0)
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return 0;
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/* For now create the log file in /sys/kernel/debug/dri/0 dir */
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log_dir = dev_priv->drm.primary->debugfs_root;
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/* If /sys/kernel/debug/dri/0 location do not exist, then debugfs is
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* not mounted and so can't create the relay file.
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* The relay API seems to fit well with debugfs only, for availing relay
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* there are 3 requirements which can be met for debugfs file only in a
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* straightforward/clean manner :-
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* i) Need the associated dentry pointer of the file, while opening the
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* relay channel.
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* ii) Should be able to use 'relay_file_operations' fops for the file.
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* iii) Set the 'i_private' field of file's inode to the pointer of
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* relay channel buffer.
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*/
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if (!log_dir) {
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DRM_ERROR("Debugfs dir not available yet for GuC log file\n");
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return -ENODEV;
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}
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ret = relay_late_setup_files(guc->log.runtime.relay_chan, "guc_log", log_dir);
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if (ret < 0 && ret != -EEXIST) {
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DRM_ERROR("Couldn't associate relay chan with file %d\n", ret);
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return ret;
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}
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return 0;
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}
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static void guc_move_to_next_buf(struct intel_guc *guc)
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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(guc->log.runtime.relay_chan, guc->log.vma->obj->base.size);
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/* Switch to the next sub buffer */
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relay_flush(guc->log.runtime.relay_chan);
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}
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static void *guc_get_write_buffer(struct intel_guc *guc)
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{
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if (!guc->log.runtime.relay_chan)
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return NULL;
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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(guc->log.runtime.relay_chan, 0);
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}
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static bool guc_check_log_buf_overflow(struct intel_guc *guc,
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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 = guc->log.prev_overflow_count[type];
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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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guc->log.prev_overflow_count[type] = full_cnt;
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guc->log.total_overflow_count[type] += 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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guc->log.total_overflow_count[type] += 16;
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}
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DRM_ERROR_RATELIMITED("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 (GUC_LOG_ISR_PAGES + 1) * PAGE_SIZE;
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case GUC_DPC_LOG_BUFFER:
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return (GUC_LOG_DPC_PAGES + 1) * PAGE_SIZE;
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case GUC_CRASH_DUMP_LOG_BUFFER:
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return (GUC_LOG_CRASH_PAGES + 1) * PAGE_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 *guc)
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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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if (WARN_ON(!guc->log.runtime.buf_addr))
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return;
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/* Get the pointer to shared GuC log buffer */
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log_buf_state = src_data = guc->log.runtime.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(guc);
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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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/* 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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guc->log.flush_count[type] += log_buf_state_local.flush_to_file;
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new_overflow = guc_check_log_buf_overflow(guc, 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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if (unlikely(!log_buf_snapshot_state))
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continue;
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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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/* 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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if (log_buf_snapshot_state)
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guc_move_to_next_buf(guc);
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else {
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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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guc->log.capture_miss_count++;
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}
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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 *guc =
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container_of(work, struct intel_guc, log.runtime.flush_work);
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guc_log_capture_logs(guc);
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}
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static bool guc_log_has_runtime(struct intel_guc *guc)
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{
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return guc->log.runtime.buf_addr != NULL;
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}
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static int guc_log_runtime_create(struct intel_guc *guc)
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{
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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void *vaddr;
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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(&dev_priv->drm.struct_mutex);
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GEM_BUG_ON(guc_log_has_runtime(guc));
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ret = i915_gem_object_set_to_wc_domain(guc->log.vma->obj, true);
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if (ret)
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return ret;
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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(guc->log.vma->obj, I915_MAP_WC);
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if (IS_ERR(vaddr)) {
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DRM_ERROR("Couldn't map log buffer pages %d\n", ret);
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return PTR_ERR(vaddr);
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}
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guc->log.runtime.buf_addr = vaddr;
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/* Keep the size of sub buffers same as shared log buffer */
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subbuf_size = guc->log.vma->obj->base.size;
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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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/* Create a relay channel, so that we have buffers for storing
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* the GuC firmware logs, the channel will be linked with a file
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* later on when debugfs is registered.
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*/
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guc_log_relay_chan = relay_open(NULL, NULL, subbuf_size,
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n_subbufs, &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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goto err_vaddr;
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}
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|
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GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size);
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guc->log.runtime.relay_chan = guc_log_relay_chan;
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INIT_WORK(&guc->log.runtime.flush_work, capture_logs_work);
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/*
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* GuC log buffer flush work item has to do register access to
|
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* send the ack to GuC and this work item, if not synced before
|
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* suspend, can potentially get executed after the GFX device is
|
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* suspended.
|
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* By marking the WQ as freezable, we don't have to bother about
|
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* flushing of this work item from the suspend hooks, the pending
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* work item if any will be either executed before the suspend
|
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* or scheduled later on resume. This way the handling of work
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* item can be kept same between system suspend & rpm suspend.
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*/
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guc->log.runtime.flush_wq = alloc_ordered_workqueue("i915-guc_log",
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WQ_HIGHPRI | WQ_FREEZABLE);
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if (!guc->log.runtime.flush_wq) {
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DRM_ERROR("Couldn't allocate the wq for GuC logging\n");
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ret = -ENOMEM;
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goto err_relaychan;
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}
|
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|
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return 0;
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|
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err_relaychan:
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relay_close(guc->log.runtime.relay_chan);
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err_vaddr:
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i915_gem_object_unpin_map(guc->log.vma->obj);
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guc->log.runtime.buf_addr = NULL;
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return ret;
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}
|
|
|
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static void guc_log_runtime_destroy(struct intel_guc *guc)
|
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{
|
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/*
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* It's possible that the runtime stuff was never allocated because
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* guc_log_level was < 0 at the time
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**/
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if (!guc_log_has_runtime(guc))
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return;
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destroy_workqueue(guc->log.runtime.flush_wq);
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relay_close(guc->log.runtime.relay_chan);
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i915_gem_object_unpin_map(guc->log.vma->obj);
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guc->log.runtime.buf_addr = NULL;
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}
|
|
|
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static int guc_log_late_setup(struct intel_guc *guc)
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{
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struct drm_i915_private *dev_priv = guc_to_i915(guc);
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int ret;
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lockdep_assert_held(&dev_priv->drm.struct_mutex);
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|
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if (!guc_log_has_runtime(guc)) {
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/* If log_level was set as -1 at boot time, then setup needed to
|
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* handle log buffer flush interrupts would not have been done yet,
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* so do that now.
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*/
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ret = guc_log_runtime_create(guc);
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if (ret)
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goto err;
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}
|
|
|
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ret = guc_log_relay_file_create(guc);
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if (ret)
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goto err_runtime;
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|
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return 0;
|
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|
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err_runtime:
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guc_log_runtime_destroy(guc);
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err:
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/* logging will remain off */
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i915_modparams.guc_log_level = -1;
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return ret;
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}
|
|
|
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static void guc_log_capture_logs(struct intel_guc *guc)
|
|
{
|
|
struct drm_i915_private *dev_priv = guc_to_i915(guc);
|
|
|
|
guc_read_update_log_buffer(guc);
|
|
|
|
/* Generally device is expected to be active only at this
|
|
* time, so get/put should be really quick.
|
|
*/
|
|
intel_runtime_pm_get(dev_priv);
|
|
guc_log_flush_complete(guc);
|
|
intel_runtime_pm_put(dev_priv);
|
|
}
|
|
|
|
static void guc_flush_logs(struct intel_guc *guc)
|
|
{
|
|
struct drm_i915_private *dev_priv = guc_to_i915(guc);
|
|
|
|
if (!USES_GUC_SUBMISSION(dev_priv) ||
|
|
(i915_modparams.guc_log_level < 0))
|
|
return;
|
|
|
|
/* First disable the interrupts, will be renabled afterwards */
|
|
gen9_disable_guc_interrupts(dev_priv);
|
|
|
|
/* Before initiating the forceful flush, wait for any pending/ongoing
|
|
* flush to complete otherwise forceful flush may not actually happen.
|
|
*/
|
|
flush_work(&guc->log.runtime.flush_work);
|
|
|
|
/* Ask GuC to update the log buffer state */
|
|
guc_log_flush(guc);
|
|
|
|
/* GuC would have updated log buffer by now, so capture it */
|
|
guc_log_capture_logs(guc);
|
|
}
|
|
|
|
int intel_guc_log_create(struct intel_guc *guc)
|
|
{
|
|
struct i915_vma *vma;
|
|
unsigned long offset;
|
|
u32 flags;
|
|
u32 size;
|
|
int ret;
|
|
|
|
GEM_BUG_ON(guc->log.vma);
|
|
|
|
if (i915_modparams.guc_log_level > GUC_LOG_VERBOSITY_MAX)
|
|
i915_modparams.guc_log_level = GUC_LOG_VERBOSITY_MAX;
|
|
|
|
/* The first page is to save log buffer state. Allocate one
|
|
* extra page for others in case for overlap */
|
|
size = (1 + GUC_LOG_DPC_PAGES + 1 +
|
|
GUC_LOG_ISR_PAGES + 1 +
|
|
GUC_LOG_CRASH_PAGES + 1) << PAGE_SHIFT;
|
|
|
|
/* 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 (WARN_ON(!i915_has_memcpy_from_wc())) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
vma = intel_guc_allocate_vma(guc, size);
|
|
if (IS_ERR(vma)) {
|
|
ret = PTR_ERR(vma);
|
|
goto err;
|
|
}
|
|
|
|
guc->log.vma = vma;
|
|
|
|
if (i915_modparams.guc_log_level >= 0) {
|
|
ret = guc_log_runtime_create(guc);
|
|
if (ret < 0)
|
|
goto err_vma;
|
|
}
|
|
|
|
/* each allocated unit is a page */
|
|
flags = GUC_LOG_VALID | GUC_LOG_NOTIFY_ON_HALF_FULL |
|
|
(GUC_LOG_DPC_PAGES << GUC_LOG_DPC_SHIFT) |
|
|
(GUC_LOG_ISR_PAGES << GUC_LOG_ISR_SHIFT) |
|
|
(GUC_LOG_CRASH_PAGES << GUC_LOG_CRASH_SHIFT);
|
|
|
|
offset = guc_ggtt_offset(vma) >> PAGE_SHIFT; /* in pages */
|
|
guc->log.flags = (offset << GUC_LOG_BUF_ADDR_SHIFT) | flags;
|
|
|
|
return 0;
|
|
|
|
err_vma:
|
|
i915_vma_unpin_and_release(&guc->log.vma);
|
|
err:
|
|
/* logging will be off */
|
|
i915_modparams.guc_log_level = -1;
|
|
return ret;
|
|
}
|
|
|
|
void intel_guc_log_destroy(struct intel_guc *guc)
|
|
{
|
|
guc_log_runtime_destroy(guc);
|
|
i915_vma_unpin_and_release(&guc->log.vma);
|
|
}
|
|
|
|
int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
|
|
{
|
|
struct intel_guc *guc = &dev_priv->guc;
|
|
|
|
union guc_log_control log_param;
|
|
int ret;
|
|
|
|
log_param.value = control_val;
|
|
|
|
if (log_param.verbosity < GUC_LOG_VERBOSITY_MIN ||
|
|
log_param.verbosity > GUC_LOG_VERBOSITY_MAX)
|
|
return -EINVAL;
|
|
|
|
/* This combination doesn't make sense & won't have any effect */
|
|
if (!log_param.logging_enabled && (i915_modparams.guc_log_level < 0))
|
|
return 0;
|
|
|
|
ret = guc_log_control(guc, log_param.value);
|
|
if (ret < 0) {
|
|
DRM_DEBUG_DRIVER("guc_logging_control action failed %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (log_param.logging_enabled) {
|
|
i915_modparams.guc_log_level = log_param.verbosity;
|
|
|
|
/* If log_level was set as -1 at boot time, then the relay channel file
|
|
* wouldn't have been created by now and interrupts also would not have
|
|
* been enabled. Try again now, just in case.
|
|
*/
|
|
ret = guc_log_late_setup(guc);
|
|
if (ret < 0) {
|
|
DRM_DEBUG_DRIVER("GuC log late setup failed %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* GuC logging is currently the only user of Guc2Host interrupts */
|
|
gen9_enable_guc_interrupts(dev_priv);
|
|
} else {
|
|
/* Once logging is disabled, GuC won't generate logs & send an
|
|
* interrupt. But there could be some data in the log buffer
|
|
* which is yet to be captured. So request GuC to update the log
|
|
* buffer state and then collect the left over logs.
|
|
*/
|
|
guc_flush_logs(guc);
|
|
|
|
/* As logging is disabled, update log level to reflect that */
|
|
i915_modparams.guc_log_level = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void i915_guc_log_register(struct drm_i915_private *dev_priv)
|
|
{
|
|
if (!USES_GUC_SUBMISSION(dev_priv) ||
|
|
(i915_modparams.guc_log_level < 0))
|
|
return;
|
|
|
|
mutex_lock(&dev_priv->drm.struct_mutex);
|
|
guc_log_late_setup(&dev_priv->guc);
|
|
mutex_unlock(&dev_priv->drm.struct_mutex);
|
|
}
|
|
|
|
void i915_guc_log_unregister(struct drm_i915_private *dev_priv)
|
|
{
|
|
if (!USES_GUC_SUBMISSION(dev_priv))
|
|
return;
|
|
|
|
mutex_lock(&dev_priv->drm.struct_mutex);
|
|
/* GuC logging is currently the only user of Guc2Host interrupts */
|
|
gen9_disable_guc_interrupts(dev_priv);
|
|
guc_log_runtime_destroy(&dev_priv->guc);
|
|
mutex_unlock(&dev_priv->drm.struct_mutex);
|
|
}
|