# general-purpose microcontroller (GuC) support
i915-y += intel_uc.o \
+ intel_guc_log.o \
intel_guc_loader.o \
i915_guc_submission.o
/* Reveal our presence to userspace */
if (drm_dev_register(dev, 0) == 0) {
i915_debugfs_register(dev_priv);
- i915_guc_register(dev_priv);
+ i915_guc_log_register(dev_priv);
i915_setup_sysfs(dev_priv);
/* Depends on sysfs having been initialized */
i915_perf_unregister(dev_priv);
i915_teardown_sysfs(dev_priv);
- i915_guc_unregister(dev_priv);
+ i915_guc_log_unregister(dev_priv);
i915_debugfs_unregister(dev_priv);
drm_dev_unregister(&dev_priv->drm);
*
*/
#include <linux/circ_buf.h>
-#include <linux/debugfs.h>
-#include <linux/relay.h>
#include "i915_drv.h"
#include "intel_uc.h"
*/
/**
- * guc_allocate_vma() - Allocate a GGTT VMA for GuC usage
+ * intel_guc_allocate_vma() - Allocate a GGTT VMA for GuC usage
* @guc: the guc
* @size: size of area to allocate (both virtual space and memory)
*
*
* Return: A i915_vma if successful, otherwise an ERR_PTR.
*/
-static struct i915_vma *guc_allocate_vma(struct intel_guc *guc, u32 size)
+struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size)
{
struct drm_i915_private *dev_priv = guc_to_i915(guc);
struct drm_i915_gem_object *obj;
}
/* The first page is doorbell/proc_desc. Two followed pages are wq. */
- vma = guc_allocate_vma(guc, GUC_DB_SIZE + GUC_WQ_SIZE);
+ vma = intel_guc_allocate_vma(guc, GUC_DB_SIZE + GUC_WQ_SIZE);
if (IS_ERR(vma))
goto err;
return NULL;
}
-/*
- * Sub buffer switch callback. Called whenever relay has to switch to a new
- * sub buffer, relay stays on the same sub buffer if 0 is returned.
- */
-static int subbuf_start_callback(struct rchan_buf *buf,
- void *subbuf,
- void *prev_subbuf,
- size_t prev_padding)
-{
- /* Use no-overwrite mode by default, where relay will stop accepting
- * new data if there are no empty sub buffers left.
- * There is no strict synchronization enforced by relay between Consumer
- * and Producer. In overwrite mode, there is a possibility of getting
- * inconsistent/garbled data, the producer could be writing on to the
- * same sub buffer from which Consumer is reading. This can't be avoided
- * unless Consumer is fast enough and can always run in tandem with
- * Producer.
- */
- if (relay_buf_full(buf))
- return 0;
-
- return 1;
-}
-
-/*
- * file_create() callback. Creates relay file in debugfs.
- */
-static struct dentry *create_buf_file_callback(const char *filename,
- struct dentry *parent,
- umode_t mode,
- struct rchan_buf *buf,
- int *is_global)
-{
- struct dentry *buf_file;
-
- /* This to enable the use of a single buffer for the relay channel and
- * correspondingly have a single file exposed to User, through which
- * it can collect the logs in order without any post-processing.
- * Need to set 'is_global' even if parent is NULL for early logging.
- */
- *is_global = 1;
-
- if (!parent)
- return NULL;
-
- /* Not using the channel filename passed as an argument, since for each
- * channel relay appends the corresponding CPU number to the filename
- * passed in relay_open(). This should be fine as relay just needs a
- * dentry of the file associated with the channel buffer and that file's
- * name need not be same as the filename passed as an argument.
- */
- buf_file = debugfs_create_file("guc_log", mode,
- parent, buf, &relay_file_operations);
- return buf_file;
-}
-
-/*
- * file_remove() default callback. Removes relay file in debugfs.
- */
-static int remove_buf_file_callback(struct dentry *dentry)
-{
- debugfs_remove(dentry);
- return 0;
-}
-
-/* relay channel callbacks */
-static struct rchan_callbacks relay_callbacks = {
- .subbuf_start = subbuf_start_callback,
- .create_buf_file = create_buf_file_callback,
- .remove_buf_file = remove_buf_file_callback,
-};
-
-static void guc_log_remove_relay_file(struct intel_guc *guc)
-{
- relay_close(guc->log.relay_chan);
-}
-
-static int guc_log_create_relay_channel(struct intel_guc *guc)
-{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
- struct rchan *guc_log_relay_chan;
- size_t n_subbufs, subbuf_size;
-
- /* Keep the size of sub buffers same as shared log buffer */
- subbuf_size = guc->log.vma->obj->base.size;
-
- /* Store up to 8 snapshots, which is large enough to buffer sufficient
- * boot time logs and provides enough leeway to User, in terms of
- * latency, for consuming the logs from relay. Also doesn't take
- * up too much memory.
- */
- n_subbufs = 8;
-
- guc_log_relay_chan = relay_open(NULL, NULL, subbuf_size,
- n_subbufs, &relay_callbacks, dev_priv);
- if (!guc_log_relay_chan) {
- DRM_ERROR("Couldn't create relay chan for GuC logging\n");
- return -ENOMEM;
- }
-
- GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size);
- guc->log.relay_chan = guc_log_relay_chan;
- return 0;
-}
-
-static int guc_log_create_relay_file(struct intel_guc *guc)
-{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
- struct dentry *log_dir;
- int ret;
-
- /* For now create the log file in /sys/kernel/debug/dri/0 dir */
- log_dir = dev_priv->drm.primary->debugfs_root;
-
- /* If /sys/kernel/debug/dri/0 location do not exist, then debugfs is
- * not mounted and so can't create the relay file.
- * The relay API seems to fit well with debugfs only, for availing relay
- * there are 3 requirements which can be met for debugfs file only in a
- * straightforward/clean manner :-
- * i) Need the associated dentry pointer of the file, while opening the
- * relay channel.
- * ii) Should be able to use 'relay_file_operations' fops for the file.
- * iii) Set the 'i_private' field of file's inode to the pointer of
- * relay channel buffer.
- */
- if (!log_dir) {
- DRM_ERROR("Debugfs dir not available yet for GuC log file\n");
- return -ENODEV;
- }
-
- ret = relay_late_setup_files(guc->log.relay_chan, "guc_log", log_dir);
- if (ret) {
- DRM_ERROR("Couldn't associate relay chan with file %d\n", ret);
- return ret;
- }
-
- return 0;
-}
-
-static void guc_move_to_next_buf(struct intel_guc *guc)
-{
- /* Make sure the updates made in the sub buffer are visible when
- * Consumer sees the following update to offset inside the sub buffer.
- */
- smp_wmb();
-
- /* All data has been written, so now move the offset of sub buffer. */
- relay_reserve(guc->log.relay_chan, guc->log.vma->obj->base.size);
-
- /* Switch to the next sub buffer */
- relay_flush(guc->log.relay_chan);
-}
-
-static void *guc_get_write_buffer(struct intel_guc *guc)
-{
- if (!guc->log.relay_chan)
- return NULL;
-
- /* Just get the base address of a new sub buffer and copy data into it
- * ourselves. NULL will be returned in no-overwrite mode, if all sub
- * buffers are full. Could have used the relay_write() to indirectly
- * copy the data, but that would have been bit convoluted, as we need to
- * write to only certain locations inside a sub buffer which cannot be
- * done without using relay_reserve() along with relay_write(). So its
- * better to use relay_reserve() alone.
- */
- return relay_reserve(guc->log.relay_chan, 0);
-}
-
-static bool
-guc_check_log_buf_overflow(struct intel_guc *guc,
- enum guc_log_buffer_type type, unsigned int full_cnt)
-{
- unsigned int prev_full_cnt = guc->log.prev_overflow_count[type];
- bool overflow = false;
-
- if (full_cnt != prev_full_cnt) {
- overflow = true;
-
- guc->log.prev_overflow_count[type] = full_cnt;
- guc->log.total_overflow_count[type] += full_cnt - prev_full_cnt;
-
- if (full_cnt < prev_full_cnt) {
- /* buffer_full_cnt is a 4 bit counter */
- guc->log.total_overflow_count[type] += 16;
- }
- DRM_ERROR_RATELIMITED("GuC log buffer overflow\n");
- }
-
- return overflow;
-}
-
-static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type)
-{
- switch (type) {
- case GUC_ISR_LOG_BUFFER:
- return (GUC_LOG_ISR_PAGES + 1) * PAGE_SIZE;
- case GUC_DPC_LOG_BUFFER:
- return (GUC_LOG_DPC_PAGES + 1) * PAGE_SIZE;
- case GUC_CRASH_DUMP_LOG_BUFFER:
- return (GUC_LOG_CRASH_PAGES + 1) * PAGE_SIZE;
- default:
- MISSING_CASE(type);
- }
-
- return 0;
-}
-
-static void guc_read_update_log_buffer(struct intel_guc *guc)
-{
- unsigned int buffer_size, read_offset, write_offset, bytes_to_copy, full_cnt;
- struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state;
- struct guc_log_buffer_state log_buf_state_local;
- enum guc_log_buffer_type type;
- void *src_data, *dst_data;
- bool new_overflow;
-
- if (WARN_ON(!guc->log.buf_addr))
- return;
-
- /* Get the pointer to shared GuC log buffer */
- log_buf_state = src_data = guc->log.buf_addr;
-
- /* Get the pointer to local buffer to store the logs */
- log_buf_snapshot_state = dst_data = guc_get_write_buffer(guc);
-
- /* Actual logs are present from the 2nd page */
- src_data += PAGE_SIZE;
- dst_data += PAGE_SIZE;
-
- for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
- /* Make a copy of the state structure, inside GuC log buffer
- * (which is uncached mapped), on the stack to avoid reading
- * from it multiple times.
- */
- memcpy(&log_buf_state_local, log_buf_state,
- sizeof(struct guc_log_buffer_state));
- buffer_size = guc_get_log_buffer_size(type);
- read_offset = log_buf_state_local.read_ptr;
- write_offset = log_buf_state_local.sampled_write_ptr;
- full_cnt = log_buf_state_local.buffer_full_cnt;
-
- /* Bookkeeping stuff */
- guc->log.flush_count[type] += log_buf_state_local.flush_to_file;
- new_overflow = guc_check_log_buf_overflow(guc, type, full_cnt);
-
- /* Update the state of shared log buffer */
- log_buf_state->read_ptr = write_offset;
- log_buf_state->flush_to_file = 0;
- log_buf_state++;
-
- if (unlikely(!log_buf_snapshot_state))
- continue;
-
- /* First copy the state structure in snapshot buffer */
- memcpy(log_buf_snapshot_state, &log_buf_state_local,
- sizeof(struct guc_log_buffer_state));
-
- /* The write pointer could have been updated by GuC firmware,
- * after sending the flush interrupt to Host, for consistency
- * set write pointer value to same value of sampled_write_ptr
- * in the snapshot buffer.
- */
- log_buf_snapshot_state->write_ptr = write_offset;
- log_buf_snapshot_state++;
-
- /* Now copy the actual logs. */
- if (unlikely(new_overflow)) {
- /* copy the whole buffer in case of overflow */
- read_offset = 0;
- write_offset = buffer_size;
- } else if (unlikely((read_offset > buffer_size) ||
- (write_offset > buffer_size))) {
- DRM_ERROR("invalid log buffer state\n");
- /* copy whole buffer as offsets are unreliable */
- read_offset = 0;
- write_offset = buffer_size;
- }
-
- /* Just copy the newly written data */
- if (read_offset > write_offset) {
- i915_memcpy_from_wc(dst_data, src_data, write_offset);
- bytes_to_copy = buffer_size - read_offset;
- } else {
- bytes_to_copy = write_offset - read_offset;
- }
- i915_memcpy_from_wc(dst_data + read_offset,
- src_data + read_offset, bytes_to_copy);
-
- src_data += buffer_size;
- dst_data += buffer_size;
- }
-
- if (log_buf_snapshot_state)
- guc_move_to_next_buf(guc);
- else {
- /* Used rate limited to avoid deluge of messages, logs might be
- * getting consumed by User at a slow rate.
- */
- DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n");
- guc->log.capture_miss_count++;
- }
-}
-
-static void guc_capture_logs_work(struct work_struct *work)
-{
- struct drm_i915_private *dev_priv =
- container_of(work, struct drm_i915_private, guc.log.flush_work);
-
- i915_guc_capture_logs(dev_priv);
-}
-
-static void guc_log_cleanup(struct intel_guc *guc)
-{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
-
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
- /* First disable the flush interrupt */
- gen9_disable_guc_interrupts(dev_priv);
- if (guc->log.flush_wq)
- destroy_workqueue(guc->log.flush_wq);
-
- guc->log.flush_wq = NULL;
-
- if (guc->log.relay_chan)
- guc_log_remove_relay_file(guc);
-
- guc->log.relay_chan = NULL;
-
- if (guc->log.buf_addr)
- i915_gem_object_unpin_map(guc->log.vma->obj);
-
- guc->log.buf_addr = NULL;
-}
-
-static int guc_log_create_extras(struct intel_guc *guc)
-{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
- void *vaddr;
- int ret;
-
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
- /* Nothing to do */
- if (i915.guc_log_level < 0)
- return 0;
-
- if (!guc->log.buf_addr) {
- /* Create a WC (Uncached for read) vmalloc mapping of log
- * buffer pages, so that we can directly get the data
- * (up-to-date) from memory.
- */
- vaddr = i915_gem_object_pin_map(guc->log.vma->obj, I915_MAP_WC);
- if (IS_ERR(vaddr)) {
- ret = PTR_ERR(vaddr);
- DRM_ERROR("Couldn't map log buffer pages %d\n", ret);
- return ret;
- }
-
- guc->log.buf_addr = vaddr;
- }
-
- if (!guc->log.relay_chan) {
- /* Create a relay channel, so that we have buffers for storing
- * the GuC firmware logs, the channel will be linked with a file
- * later on when debugfs is registered.
- */
- ret = guc_log_create_relay_channel(guc);
- if (ret)
- return ret;
- }
-
- if (!guc->log.flush_wq) {
- INIT_WORK(&guc->log.flush_work, guc_capture_logs_work);
-
- /*
- * GuC log buffer flush work item has to do register access to
- * send the ack to GuC and this work item, if not synced before
- * suspend, can potentially get executed after the GFX device is
- * suspended.
- * By marking the WQ as freezable, we don't have to bother about
- * flushing of this work item from the suspend hooks, the pending
- * work item if any will be either executed before the suspend
- * or scheduled later on resume. This way the handling of work
- * item can be kept same between system suspend & rpm suspend.
- */
- guc->log.flush_wq = alloc_ordered_workqueue("i915-guc_log",
- WQ_HIGHPRI | WQ_FREEZABLE);
- if (guc->log.flush_wq == NULL) {
- DRM_ERROR("Couldn't allocate the wq for GuC logging\n");
- return -ENOMEM;
- }
- }
-
- return 0;
-}
-
-static void guc_log_create(struct intel_guc *guc)
-{
- struct i915_vma *vma;
- unsigned long offset;
- uint32_t size, flags;
-
- if (i915.guc_log_level > GUC_LOG_VERBOSITY_MAX)
- i915.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;
-
- vma = guc->log.vma;
- if (!vma) {
- /* 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())) {
- /* logging will not be enabled */
- i915.guc_log_level = -1;
- return;
- }
-
- vma = guc_allocate_vma(guc, size);
- if (IS_ERR(vma)) {
- /* logging will be off */
- i915.guc_log_level = -1;
- return;
- }
-
- guc->log.vma = vma;
-
- if (guc_log_create_extras(guc)) {
- guc_log_cleanup(guc);
- i915_vma_unpin_and_release(&guc->log.vma);
- i915.guc_log_level = -1;
- return;
- }
- }
-
- /* 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;
-}
-
-static int guc_log_late_setup(struct intel_guc *guc)
-{
- struct drm_i915_private *dev_priv = guc_to_i915(guc);
- int ret;
-
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
-
- if (i915.guc_log_level < 0)
- return -EINVAL;
-
- /* If log_level was set as -1 at boot time, then setup needed to
- * handle log buffer flush interrupts would not have been done yet,
- * so do that now.
- */
- ret = guc_log_create_extras(guc);
- if (ret)
- goto err;
-
- ret = guc_log_create_relay_file(guc);
- if (ret)
- goto err;
-
- return 0;
-err:
- guc_log_cleanup(guc);
- /* logging will remain off */
- i915.guc_log_level = -1;
- return ret;
-}
static void guc_policies_init(struct guc_policies *policies)
{
vma = guc->ads_vma;
if (!vma) {
- vma = guc_allocate_vma(guc, PAGE_ALIGN(size));
+ vma = intel_guc_allocate_vma(guc, PAGE_ALIGN(size));
if (IS_ERR(vma))
return;
if (guc->ctx_pool_vma)
return 0; /* already allocated */
- vma = guc_allocate_vma(guc, gemsize);
+ vma = intel_guc_allocate_vma(guc, gemsize);
if (IS_ERR(vma))
return PTR_ERR(vma);
guc->ctx_pool_vma = vma;
ida_init(&guc->ctx_ids);
- guc_log_create(guc);
+ intel_guc_log_create(guc);
guc_addon_create(guc);
guc->execbuf_client = guc_client_alloc(dev_priv,
return intel_guc_send(guc, data, ARRAY_SIZE(data));
}
-void i915_guc_capture_logs(struct drm_i915_private *dev_priv)
-{
- guc_read_update_log_buffer(&dev_priv->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);
- intel_guc_log_flush_complete(&dev_priv->guc);
- intel_runtime_pm_put(dev_priv);
-}
-
-void i915_guc_flush_logs(struct drm_i915_private *dev_priv)
-{
- if (!i915.enable_guc_submission || (i915.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(&dev_priv->guc.log.flush_work);
-
- /* Ask GuC to update the log buffer state */
- intel_guc_log_flush(&dev_priv->guc);
-
- /* GuC would have updated log buffer by now, so capture it */
- i915_guc_capture_logs(dev_priv);
-}
-
-void i915_guc_unregister(struct drm_i915_private *dev_priv)
-{
- if (!i915.enable_guc_submission)
- return;
- mutex_lock(&dev_priv->drm.struct_mutex);
- guc_log_cleanup(&dev_priv->guc);
- mutex_unlock(&dev_priv->drm.struct_mutex);
-}
-
-void i915_guc_register(struct drm_i915_private *dev_priv)
-{
- if (!i915.enable_guc_submission)
- return;
-
- mutex_lock(&dev_priv->drm.struct_mutex);
- guc_log_late_setup(&dev_priv->guc);
- mutex_unlock(&dev_priv->drm.struct_mutex);
-}
-
-int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val)
-{
- 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.guc_log_level < 0))
- return 0;
-
- ret = intel_guc_log_control(&dev_priv->guc, log_param.value);
- if (ret < 0) {
- DRM_DEBUG_DRIVER("guc_logging_control action failed %d\n", ret);
- return ret;
- }
-
- i915.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.
- */
- if (!dev_priv->guc.log.relay_chan) {
- ret = guc_log_late_setup(&dev_priv->guc);
- if (!ret)
- gen9_enable_guc_interrupts(dev_priv);
- } else if (!log_param.logging_enabled) {
- /* 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.
- */
- i915_guc_flush_logs(dev_priv);
-
- /* As logging is disabled, update log level to reflect that */
- i915.guc_log_level = -1;
- } else {
- /* In case interrupts were disabled, enable them now */
- gen9_enable_guc_interrupts(dev_priv);
- }
-
- return ret;
-}
* 512K. In order to exclude 0-512K address space from GGTT, all gfx objects
* used by GuC is pinned with PIN_OFFSET_BIAS along with size of WOPCM.
*
- * Firmware log:
- * Firmware log is enabled by setting i915.guc_log_level to non-negative level.
- * Log data is printed out via reading debugfs i915_guc_log_dump. Reading from
- * i915_guc_load_status will print out firmware loading status and scratch
- * registers value.
- *
*/
#define SKL_FW_MAJOR 6
--- /dev/null
+/*
+ * Copyright © 2014-2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+#include <linux/debugfs.h>
+#include <linux/relay.h>
+#include "i915_drv.h"
+
+static void guc_log_capture_logs(struct intel_guc *guc);
+
+/**
+ * DOC: GuC firmware log
+ *
+ * Firmware log is enabled by setting i915.guc_log_level to non-negative level.
+ * Log data is printed out via reading debugfs i915_guc_log_dump. Reading from
+ * i915_guc_load_status will print out firmware loading status and scratch
+ * registers value.
+ *
+ */
+
+static int guc_log_flush_complete(struct intel_guc *guc)
+{
+ u32 action[] = {
+ INTEL_GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE
+ };
+
+ return intel_guc_send(guc, action, ARRAY_SIZE(action));
+}
+
+static int guc_log_flush(struct intel_guc *guc)
+{
+ u32 action[] = {
+ INTEL_GUC_ACTION_FORCE_LOG_BUFFER_FLUSH,
+ 0
+ };
+
+ return intel_guc_send(guc, action, ARRAY_SIZE(action));
+}
+
+static int guc_log_control(struct intel_guc *guc, u32 control_val)
+{
+ u32 action[] = {
+ INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING,
+ control_val
+ };
+
+ return intel_guc_send(guc, action, ARRAY_SIZE(action));
+}
+
+
+/*
+ * Sub buffer switch callback. Called whenever relay has to switch to a new
+ * sub buffer, relay stays on the same sub buffer if 0 is returned.
+ */
+static int subbuf_start_callback(struct rchan_buf *buf,
+ void *subbuf,
+ void *prev_subbuf,
+ size_t prev_padding)
+{
+ /* Use no-overwrite mode by default, where relay will stop accepting
+ * new data if there are no empty sub buffers left.
+ * There is no strict synchronization enforced by relay between Consumer
+ * and Producer. In overwrite mode, there is a possibility of getting
+ * inconsistent/garbled data, the producer could be writing on to the
+ * same sub buffer from which Consumer is reading. This can't be avoided
+ * unless Consumer is fast enough and can always run in tandem with
+ * Producer.
+ */
+ if (relay_buf_full(buf))
+ return 0;
+
+ return 1;
+}
+
+/*
+ * file_create() callback. Creates relay file in debugfs.
+ */
+static struct dentry *create_buf_file_callback(const char *filename,
+ struct dentry *parent,
+ umode_t mode,
+ struct rchan_buf *buf,
+ int *is_global)
+{
+ struct dentry *buf_file;
+
+ /* This to enable the use of a single buffer for the relay channel and
+ * correspondingly have a single file exposed to User, through which
+ * it can collect the logs in order without any post-processing.
+ * Need to set 'is_global' even if parent is NULL for early logging.
+ */
+ *is_global = 1;
+
+ if (!parent)
+ return NULL;
+
+ /* Not using the channel filename passed as an argument, since for each
+ * channel relay appends the corresponding CPU number to the filename
+ * passed in relay_open(). This should be fine as relay just needs a
+ * dentry of the file associated with the channel buffer and that file's
+ * name need not be same as the filename passed as an argument.
+ */
+ buf_file = debugfs_create_file("guc_log", mode,
+ parent, buf, &relay_file_operations);
+ return buf_file;
+}
+
+/*
+ * file_remove() default callback. Removes relay file in debugfs.
+ */
+static int remove_buf_file_callback(struct dentry *dentry)
+{
+ debugfs_remove(dentry);
+ return 0;
+}
+
+/* relay channel callbacks */
+static struct rchan_callbacks relay_callbacks = {
+ .subbuf_start = subbuf_start_callback,
+ .create_buf_file = create_buf_file_callback,
+ .remove_buf_file = remove_buf_file_callback,
+};
+
+static void guc_log_remove_relay_file(struct intel_guc *guc)
+{
+ relay_close(guc->log.relay_chan);
+}
+
+static int guc_log_create_relay_channel(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+ struct rchan *guc_log_relay_chan;
+ size_t n_subbufs, subbuf_size;
+
+ /* Keep the size of sub buffers same as shared log buffer */
+ subbuf_size = guc->log.vma->obj->base.size;
+
+ /* Store up to 8 snapshots, which is large enough to buffer sufficient
+ * boot time logs and provides enough leeway to User, in terms of
+ * latency, for consuming the logs from relay. Also doesn't take
+ * up too much memory.
+ */
+ n_subbufs = 8;
+
+ guc_log_relay_chan = relay_open(NULL, NULL, subbuf_size,
+ n_subbufs, &relay_callbacks, dev_priv);
+ if (!guc_log_relay_chan) {
+ DRM_ERROR("Couldn't create relay chan for GuC logging\n");
+ return -ENOMEM;
+ }
+
+ GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size);
+ guc->log.relay_chan = guc_log_relay_chan;
+ return 0;
+}
+
+static int guc_log_create_relay_file(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+ struct dentry *log_dir;
+ int ret;
+
+ /* For now create the log file in /sys/kernel/debug/dri/0 dir */
+ log_dir = dev_priv->drm.primary->debugfs_root;
+
+ /* If /sys/kernel/debug/dri/0 location do not exist, then debugfs is
+ * not mounted and so can't create the relay file.
+ * The relay API seems to fit well with debugfs only, for availing relay
+ * there are 3 requirements which can be met for debugfs file only in a
+ * straightforward/clean manner :-
+ * i) Need the associated dentry pointer of the file, while opening the
+ * relay channel.
+ * ii) Should be able to use 'relay_file_operations' fops for the file.
+ * iii) Set the 'i_private' field of file's inode to the pointer of
+ * relay channel buffer.
+ */
+ if (!log_dir) {
+ DRM_ERROR("Debugfs dir not available yet for GuC log file\n");
+ return -ENODEV;
+ }
+
+ ret = relay_late_setup_files(guc->log.relay_chan, "guc_log", log_dir);
+ if (ret) {
+ DRM_ERROR("Couldn't associate relay chan with file %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void guc_move_to_next_buf(struct intel_guc *guc)
+{
+ /* Make sure the updates made in the sub buffer are visible when
+ * Consumer sees the following update to offset inside the sub buffer.
+ */
+ smp_wmb();
+
+ /* All data has been written, so now move the offset of sub buffer. */
+ relay_reserve(guc->log.relay_chan, guc->log.vma->obj->base.size);
+
+ /* Switch to the next sub buffer */
+ relay_flush(guc->log.relay_chan);
+}
+
+static void *guc_get_write_buffer(struct intel_guc *guc)
+{
+ if (!guc->log.relay_chan)
+ return NULL;
+
+ /* Just get the base address of a new sub buffer and copy data into it
+ * ourselves. NULL will be returned in no-overwrite mode, if all sub
+ * buffers are full. Could have used the relay_write() to indirectly
+ * copy the data, but that would have been bit convoluted, as we need to
+ * write to only certain locations inside a sub buffer which cannot be
+ * done without using relay_reserve() along with relay_write(). So its
+ * better to use relay_reserve() alone.
+ */
+ return relay_reserve(guc->log.relay_chan, 0);
+}
+
+static bool guc_check_log_buf_overflow(struct intel_guc *guc,
+ enum guc_log_buffer_type type,
+ unsigned int full_cnt)
+{
+ unsigned int prev_full_cnt = guc->log.prev_overflow_count[type];
+ bool overflow = false;
+
+ if (full_cnt != prev_full_cnt) {
+ overflow = true;
+
+ guc->log.prev_overflow_count[type] = full_cnt;
+ guc->log.total_overflow_count[type] += full_cnt - prev_full_cnt;
+
+ if (full_cnt < prev_full_cnt) {
+ /* buffer_full_cnt is a 4 bit counter */
+ guc->log.total_overflow_count[type] += 16;
+ }
+ DRM_ERROR_RATELIMITED("GuC log buffer overflow\n");
+ }
+
+ return overflow;
+}
+
+static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type)
+{
+ switch (type) {
+ case GUC_ISR_LOG_BUFFER:
+ return (GUC_LOG_ISR_PAGES + 1) * PAGE_SIZE;
+ case GUC_DPC_LOG_BUFFER:
+ return (GUC_LOG_DPC_PAGES + 1) * PAGE_SIZE;
+ case GUC_CRASH_DUMP_LOG_BUFFER:
+ return (GUC_LOG_CRASH_PAGES + 1) * PAGE_SIZE;
+ default:
+ MISSING_CASE(type);
+ }
+
+ return 0;
+}
+
+static void guc_read_update_log_buffer(struct intel_guc *guc)
+{
+ unsigned int buffer_size, read_offset, write_offset, bytes_to_copy, full_cnt;
+ struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state;
+ struct guc_log_buffer_state log_buf_state_local;
+ enum guc_log_buffer_type type;
+ void *src_data, *dst_data;
+ bool new_overflow;
+
+ if (WARN_ON(!guc->log.buf_addr))
+ return;
+
+ /* Get the pointer to shared GuC log buffer */
+ log_buf_state = src_data = guc->log.buf_addr;
+
+ /* Get the pointer to local buffer to store the logs */
+ log_buf_snapshot_state = dst_data = guc_get_write_buffer(guc);
+
+ /* Actual logs are present from the 2nd page */
+ src_data += PAGE_SIZE;
+ dst_data += PAGE_SIZE;
+
+ for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
+ /* Make a copy of the state structure, inside GuC log buffer
+ * (which is uncached mapped), on the stack to avoid reading
+ * from it multiple times.
+ */
+ memcpy(&log_buf_state_local, log_buf_state,
+ sizeof(struct guc_log_buffer_state));
+ buffer_size = guc_get_log_buffer_size(type);
+ read_offset = log_buf_state_local.read_ptr;
+ write_offset = log_buf_state_local.sampled_write_ptr;
+ full_cnt = log_buf_state_local.buffer_full_cnt;
+
+ /* Bookkeeping stuff */
+ guc->log.flush_count[type] += log_buf_state_local.flush_to_file;
+ new_overflow = guc_check_log_buf_overflow(guc, type, full_cnt);
+
+ /* Update the state of shared log buffer */
+ log_buf_state->read_ptr = write_offset;
+ log_buf_state->flush_to_file = 0;
+ log_buf_state++;
+
+ if (unlikely(!log_buf_snapshot_state))
+ continue;
+
+ /* First copy the state structure in snapshot buffer */
+ memcpy(log_buf_snapshot_state, &log_buf_state_local,
+ sizeof(struct guc_log_buffer_state));
+
+ /* The write pointer could have been updated by GuC firmware,
+ * after sending the flush interrupt to Host, for consistency
+ * set write pointer value to same value of sampled_write_ptr
+ * in the snapshot buffer.
+ */
+ log_buf_snapshot_state->write_ptr = write_offset;
+ log_buf_snapshot_state++;
+
+ /* Now copy the actual logs. */
+ if (unlikely(new_overflow)) {
+ /* copy the whole buffer in case of overflow */
+ read_offset = 0;
+ write_offset = buffer_size;
+ } else if (unlikely((read_offset > buffer_size) ||
+ (write_offset > buffer_size))) {
+ DRM_ERROR("invalid log buffer state\n");
+ /* copy whole buffer as offsets are unreliable */
+ read_offset = 0;
+ write_offset = buffer_size;
+ }
+
+ /* Just copy the newly written data */
+ if (read_offset > write_offset) {
+ i915_memcpy_from_wc(dst_data, src_data, write_offset);
+ bytes_to_copy = buffer_size - read_offset;
+ } else {
+ bytes_to_copy = write_offset - read_offset;
+ }
+ i915_memcpy_from_wc(dst_data + read_offset,
+ src_data + read_offset, bytes_to_copy);
+
+ src_data += buffer_size;
+ dst_data += buffer_size;
+ }
+
+ if (log_buf_snapshot_state)
+ guc_move_to_next_buf(guc);
+ else {
+ /* Used rate limited to avoid deluge of messages, logs might be
+ * getting consumed by User at a slow rate.
+ */
+ DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n");
+ guc->log.capture_miss_count++;
+ }
+}
+
+static void guc_log_cleanup(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+
+ lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
+ /* First disable the flush interrupt */
+ gen9_disable_guc_interrupts(dev_priv);
+
+ if (guc->log.flush_wq)
+ destroy_workqueue(guc->log.flush_wq);
+
+ guc->log.flush_wq = NULL;
+
+ if (guc->log.relay_chan)
+ guc_log_remove_relay_file(guc);
+
+ guc->log.relay_chan = NULL;
+
+ if (guc->log.buf_addr)
+ i915_gem_object_unpin_map(guc->log.vma->obj);
+
+ guc->log.buf_addr = NULL;
+}
+
+static void capture_logs_work(struct work_struct *work)
+{
+ struct intel_guc *guc =
+ container_of(work, struct intel_guc, log.flush_work);
+
+ guc_log_capture_logs(guc);
+}
+
+static int guc_log_create_extras(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+ void *vaddr;
+ int ret;
+
+ lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
+ /* Nothing to do */
+ if (i915.guc_log_level < 0)
+ return 0;
+
+ if (!guc->log.buf_addr) {
+ /* Create a WC (Uncached for read) vmalloc mapping of log
+ * buffer pages, so that we can directly get the data
+ * (up-to-date) from memory.
+ */
+ vaddr = i915_gem_object_pin_map(guc->log.vma->obj, I915_MAP_WC);
+ if (IS_ERR(vaddr)) {
+ ret = PTR_ERR(vaddr);
+ DRM_ERROR("Couldn't map log buffer pages %d\n", ret);
+ return ret;
+ }
+
+ guc->log.buf_addr = vaddr;
+ }
+
+ if (!guc->log.relay_chan) {
+ /* Create a relay channel, so that we have buffers for storing
+ * the GuC firmware logs, the channel will be linked with a file
+ * later on when debugfs is registered.
+ */
+ ret = guc_log_create_relay_channel(guc);
+ if (ret)
+ return ret;
+ }
+
+ if (!guc->log.flush_wq) {
+ INIT_WORK(&guc->log.flush_work, capture_logs_work);
+
+ /*
+ * GuC log buffer flush work item has to do register access to
+ * send the ack to GuC and this work item, if not synced before
+ * suspend, can potentially get executed after the GFX device is
+ * suspended.
+ * By marking the WQ as freezable, we don't have to bother about
+ * flushing of this work item from the suspend hooks, the pending
+ * work item if any will be either executed before the suspend
+ * or scheduled later on resume. This way the handling of work
+ * item can be kept same between system suspend & rpm suspend.
+ */
+ guc->log.flush_wq = alloc_ordered_workqueue("i915-guc_log",
+ WQ_HIGHPRI | WQ_FREEZABLE);
+ if (guc->log.flush_wq == NULL) {
+ DRM_ERROR("Couldn't allocate the wq for GuC logging\n");
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+void intel_guc_log_create(struct intel_guc *guc)
+{
+ struct i915_vma *vma;
+ unsigned long offset;
+ uint32_t size, flags;
+
+ if (i915.guc_log_level > GUC_LOG_VERBOSITY_MAX)
+ i915.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;
+
+ vma = guc->log.vma;
+ if (!vma) {
+ /* 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())) {
+ /* logging will not be enabled */
+ i915.guc_log_level = -1;
+ return;
+ }
+
+ vma = intel_guc_allocate_vma(guc, size);
+ if (IS_ERR(vma)) {
+ /* logging will be off */
+ i915.guc_log_level = -1;
+ return;
+ }
+
+ guc->log.vma = vma;
+
+ if (guc_log_create_extras(guc)) {
+ guc_log_cleanup(guc);
+ i915_vma_unpin_and_release(&guc->log.vma);
+ i915.guc_log_level = -1;
+ return;
+ }
+ }
+
+ /* 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;
+}
+
+static int guc_log_late_setup(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+ int ret;
+
+ lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
+ if (i915.guc_log_level < 0)
+ return -EINVAL;
+
+ /* If log_level was set as -1 at boot time, then setup needed to
+ * handle log buffer flush interrupts would not have been done yet,
+ * so do that now.
+ */
+ ret = guc_log_create_extras(guc);
+ if (ret)
+ goto err;
+
+ ret = guc_log_create_relay_file(guc);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ guc_log_cleanup(guc);
+ /* logging will remain off */
+ i915.guc_log_level = -1;
+ return ret;
+}
+
+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 (!i915.enable_guc_submission || (i915.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.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 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.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;
+ }
+
+ i915.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.
+ */
+ if (!dev_priv->guc.log.relay_chan) {
+ ret = guc_log_late_setup(guc);
+ if (!ret)
+ gen9_enable_guc_interrupts(dev_priv);
+ } else if (!log_param.logging_enabled) {
+ /* 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.guc_log_level = -1;
+ } else {
+ /* In case interrupts were disabled, enable them now */
+ gen9_enable_guc_interrupts(dev_priv);
+ }
+
+ return ret;
+}
+
+void i915_guc_log_register(struct drm_i915_private *dev_priv)
+{
+ if (!i915.enable_guc_submission)
+ 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 (!i915.enable_guc_submission)
+ return;
+
+ mutex_lock(&dev_priv->drm.struct_mutex);
+ guc_log_cleanup(&dev_priv->guc);
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+}
return intel_guc_send(guc, action, ARRAY_SIZE(action));
}
-int intel_guc_log_flush_complete(struct intel_guc *guc)
-{
- u32 action[] = { INTEL_GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE };
-
- return intel_guc_send(guc, action, ARRAY_SIZE(action));
-}
-
-int intel_guc_log_flush(struct intel_guc *guc)
-{
- u32 action[] = {
- INTEL_GUC_ACTION_FORCE_LOG_BUFFER_FLUSH,
- 0
- };
-
- return intel_guc_send(guc, action, ARRAY_SIZE(action));
-}
-
-int intel_guc_log_control(struct intel_guc *guc, u32 control_val)
-{
- u32 action[] = {
- INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING,
- control_val
- };
-
- return intel_guc_send(guc, action, ARRAY_SIZE(action));
-}
void intel_uc_init_early(struct drm_i915_private *dev_priv);
int intel_guc_send(struct intel_guc *guc, const u32 *action, u32 len);
int intel_guc_sample_forcewake(struct intel_guc *guc);
-int intel_guc_log_flush_complete(struct intel_guc *guc);
-int intel_guc_log_flush(struct intel_guc *guc);
-int intel_guc_log_control(struct intel_guc *guc, u32 control_val);
/* intel_guc_loader.c */
extern void intel_guc_init(struct drm_i915_private *dev_priv);
void i915_guc_wq_unreserve(struct drm_i915_gem_request *request);
void i915_guc_submission_disable(struct drm_i915_private *dev_priv);
void i915_guc_submission_fini(struct drm_i915_private *dev_priv);
-void i915_guc_capture_logs(struct drm_i915_private *dev_priv);
-void i915_guc_flush_logs(struct drm_i915_private *dev_priv);
-void i915_guc_register(struct drm_i915_private *dev_priv);
-void i915_guc_unregister(struct drm_i915_private *dev_priv);
+struct i915_vma *intel_guc_allocate_vma(struct intel_guc *guc, u32 size);
+
+/* intel_guc_log.c */
+void intel_guc_log_create(struct intel_guc *guc);
+void i915_guc_log_register(struct drm_i915_private *dev_priv);
+void i915_guc_log_unregister(struct drm_i915_private *dev_priv);
int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val);
static inline u32 guc_ggtt_offset(struct i915_vma *vma)
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