[Intel-gfx] [RFC v3 5/7] drm/i915/guc: Update GuC's log-buffer-state access for error capture.
Alan Previn
alan.previn.teres.alexis at intel.com
Tue Jan 11 09:30:15 UTC 2022
GuC log buffer regions for debug-log-events, crash-dumps and
error-state-capture are all a single bo allocation that includes
the guc_log_buffer_state structures.
Since the error-capture region is accessed with high priority at non-
deterministic times (as part of gpu coredump) while the debug-log-event
region is populated and accessed with different priorities, timings and
consumers, let's split out separate locks for buffer-state accesses
of each region.
Also, ensure a global mapping is made up front for the entire bo
throughout GuC operation so that dynamic mapping and unmapping isn't
required for error capture log access if relay-logging isn't running.
Additionally, while here, make some readibility improvements:
1. change previous function names with "capture_logs" to
"copy_debug_logs" to help make the distinction clearer.
2. Update the guc log region mapping comments to order them
according to the enum definition as per the GuC interface.
Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 2 +
.../gpu/drm/i915/gt/uc/intel_guc_capture.c | 47 ++++++
.../gpu/drm/i915/gt/uc/intel_guc_capture.h | 1 +
drivers/gpu/drm/i915/gt/uc/intel_guc_log.c | 137 +++++++++++-------
drivers/gpu/drm/i915/gt/uc/intel_guc_log.h | 16 +-
5 files changed, 143 insertions(+), 60 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 2f186f79e4d1..744fee9efa53 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -34,6 +34,8 @@ struct intel_guc {
struct intel_uc_fw fw;
/** @log: sub-structure containing GuC log related data and objects */
struct intel_guc_log log;
+ /** @log_state: states and locks for each subregion of GuC's log buffer */
+ struct intel_guc_log_stats log_state[GUC_MAX_LOG_BUFFER];
/** @ct: the command transport communication channel */
struct intel_guc_ct ct;
/** @slpc: sub-structure containing SLPC related data and objects */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
index 4546d339c042..b3b3491cfe6d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.c
@@ -586,6 +586,53 @@ int intel_guc_capture_prep_lists(struct intel_guc *guc, struct guc_ads *blob, u3
return PAGE_ALIGN(alloc_size);
}
+#define GUC_CAPTURE_OVERBUFFER_MULTIPLIER 3
+int intel_guc_capture_output_min_size_est(struct intel_guc *guc)
+{
+ struct intel_gt *gt = guc_to_gt(guc);
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ int worst_min_size = 0, num_regs = 0;
+ u16 tmp = 0;
+
+ /*
+ * If every single engine-instance suffered a failure in quick succession but
+ * were all unrelated, then a burst of multiple error-capture events would dump
+ * registers for every one engine instance, one at a time. In this case, GuC
+ * would even dump the global-registers repeatedly.
+ *
+ * For each engine instance, there would be 1 x guc_state_capture_group_t output
+ * followed by 3 x guc_state_capture_t lists. The latter is how the register
+ * dumps are split across different register types (where the '3' are global vs class
+ * vs instance). Finally, let's multiply the whole thing by 3x (just so we are
+ * not limited to just 1 round of data in a worst case full register dump log)
+ *
+ * NOTE: intel_guc_log that allocates the log buffer would round this size up to
+ * a power of two.
+ */
+
+ for_each_engine(engine, gt, id) {
+ worst_min_size += sizeof(struct guc_state_capture_group_header_t) +
+ (3 * sizeof(struct guc_state_capture_header_t));
+
+ if (!guc_capture_list_count(guc, 0, GUC_CAPTURE_LIST_TYPE_GLOBAL, 0, &tmp))
+ num_regs += tmp;
+
+ if (!guc_capture_list_count(guc, 0, GUC_CAPTURE_LIST_TYPE_ENGINE_CLASS,
+ engine->class, &tmp)) {
+ num_regs += tmp;
+ }
+ if (!guc_capture_list_count(guc, 0, GUC_CAPTURE_LIST_TYPE_ENGINE_INSTANCE,
+ engine->class, &tmp)) {
+ num_regs += tmp;
+ }
+ }
+
+ worst_min_size += (num_regs * sizeof(struct guc_mmio_reg));
+
+ return (worst_min_size * GUC_CAPTURE_OVERBUFFER_MULTIPLIER);
+}
+
void intel_guc_capture_destroy(struct intel_guc *guc)
{
guc_capture_clear_ext_regs(guc->capture.priv->reglists);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.h
index 6b5594ca529d..4d3e5221128c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_capture.h
@@ -14,6 +14,7 @@ struct guc_gt_system_info;
int intel_guc_capture_prep_lists(struct intel_guc *guc, struct guc_ads *blob, u32 blob_ggtt,
u32 capture_offset, struct guc_gt_system_info *sysinfo);
+int intel_guc_capture_output_min_size_est(struct intel_guc *guc);
void intel_guc_capture_destroy(struct intel_guc *guc);
int intel_guc_capture_init(struct intel_guc *guc);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
index a353c3504836..e669beb978d5 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
@@ -6,12 +6,13 @@
#include <linux/debugfs.h>
#include "gt/intel_gt.h"
+#include "intel_guc_capture.h"
+#include "intel_guc_log.h"
#include "i915_drv.h"
#include "i915_irq.h"
#include "i915_memcpy.h"
-#include "intel_guc_log.h"
-static void guc_log_capture_logs(struct intel_guc_log *log);
+static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log);
/**
* DOC: GuC firmware log
@@ -150,7 +151,7 @@ static void guc_move_to_next_buf(struct intel_guc_log *log)
smp_wmb();
/* All data has been written, so now move the offset of sub buffer. */
- relay_reserve(log->relay.channel, log->vma->obj->base.size);
+ relay_reserve(log->relay.channel, log->vma->obj->base.size - CAPTURE_BUFFER_SIZE);
/* Switch to the next sub buffer */
relay_flush(log->relay.channel);
@@ -170,25 +171,25 @@ static void *guc_get_write_buffer(struct intel_guc_log *log)
return relay_reserve(log->relay.channel, 0);
}
-static bool guc_check_log_buf_overflow(struct intel_guc_log *log,
- enum guc_log_buffer_type type,
+static bool guc_check_log_buf_overflow(struct intel_guc *guc,
+ struct intel_guc_log_stats *log_state,
unsigned int full_cnt)
{
- unsigned int prev_full_cnt = log->stats[type].sampled_overflow;
+ unsigned int prev_full_cnt = log_state->sampled_overflow;
bool overflow = false;
if (full_cnt != prev_full_cnt) {
overflow = true;
- log->stats[type].overflow = full_cnt;
- log->stats[type].sampled_overflow += full_cnt - prev_full_cnt;
+ log_state->overflow = full_cnt;
+ log_state->sampled_overflow += full_cnt - prev_full_cnt;
if (full_cnt < prev_full_cnt) {
/* buffer_full_cnt is a 4 bit counter */
- log->stats[type].sampled_overflow += 16;
+ log_state->sampled_overflow += 16;
}
- dev_notice_ratelimited(guc_to_gt(log_to_guc(log))->i915->drm.dev,
+ dev_notice_ratelimited(guc_to_gt(guc)->i915->drm.dev,
"GuC log buffer overflow\n");
}
@@ -211,8 +212,10 @@ static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type)
return 0;
}
-static void guc_read_update_log_buffer(struct intel_guc_log *log)
+static void _guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log)
{
+ struct intel_guc *guc = log_to_guc(log);
+ struct intel_guc_log_stats *logstate;
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;
@@ -226,7 +229,7 @@ static void guc_read_update_log_buffer(struct intel_guc_log *log)
goto out_unlock;
/* Get the pointer to shared GuC log buffer */
- log_buf_state = src_data = log->relay.buf_addr;
+ log_buf_state = src_data = log->buf_addr;
/* Get the pointer to local buffer to store the logs */
log_buf_snapshot_state = dst_data = guc_get_write_buffer(log);
@@ -236,7 +239,7 @@ static void guc_read_update_log_buffer(struct intel_guc_log *log)
* 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");
+ DRM_ERROR_RATELIMITED("no sub-buffer to copy general logs\n");
log->relay.full_count++;
goto out_unlock;
@@ -246,12 +249,16 @@ static void guc_read_update_log_buffer(struct intel_guc_log *log)
src_data += PAGE_SIZE;
dst_data += PAGE_SIZE;
- for (type = GUC_DEBUG_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
+ /* For relay logging, we exclude error state capture */
+ for (type = GUC_DEBUG_LOG_BUFFER; type <= GUC_CRASH_DUMP_LOG_BUFFER; type++) {
/*
+ * Get a lock to the buffer_state we want to read and update.
* 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.
*/
+ logstate = &guc->log_state[type];
+ mutex_lock(&logstate->lock);
memcpy(&log_buf_state_local, log_buf_state,
sizeof(struct guc_log_buffer_state));
buffer_size = guc_get_log_buffer_size(type);
@@ -260,13 +267,14 @@ static void guc_read_update_log_buffer(struct intel_guc_log *log)
full_cnt = log_buf_state_local.buffer_full_cnt;
/* Bookkeeping stuff */
- log->stats[type].flush += log_buf_state_local.flush_to_file;
- new_overflow = guc_check_log_buf_overflow(log, type, full_cnt);
+ logstate->flush += log_buf_state_local.flush_to_file;
+ new_overflow = guc_check_log_buf_overflow(guc, logstate, 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++;
+ mutex_unlock(&logstate->lock);
/* First copy the state structure in snapshot buffer */
memcpy(log_buf_snapshot_state, &log_buf_state_local,
@@ -314,49 +322,49 @@ static void guc_read_update_log_buffer(struct intel_guc_log *log)
mutex_unlock(&log->relay.lock);
}
-static void capture_logs_work(struct work_struct *work)
+static void copy_debug_logs_work(struct work_struct *work)
{
struct intel_guc_log *log =
container_of(work, struct intel_guc_log, relay.flush_work);
- guc_log_capture_logs(log);
+ guc_log_copy_debuglogs_for_relay(log);
}
-static int guc_log_map(struct intel_guc_log *log)
+static int guc_log_relay_map(struct intel_guc_log *log)
{
- void *vaddr;
-
lockdep_assert_held(&log->relay.lock);
- if (!log->vma)
+ if (!log->vma || !log->buf_addr)
return -ENODEV;
/*
- * 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.
+ * WC vmalloc mapping of log buffer pages was done at
+ * GuC Init time, but lets keep a ref for book-keeping
*/
- vaddr = i915_gem_object_pin_map_unlocked(log->vma->obj, I915_MAP_WC);
- if (IS_ERR(vaddr))
- return PTR_ERR(vaddr);
-
- log->relay.buf_addr = vaddr;
+ i915_gem_object_get(log->vma->obj);
+ log->relay.buf_in_use = true;
return 0;
}
-static void guc_log_unmap(struct intel_guc_log *log)
+static void guc_log_relay_unmap(struct intel_guc_log *log)
{
lockdep_assert_held(&log->relay.lock);
- i915_gem_object_unpin_map(log->vma->obj);
- log->relay.buf_addr = NULL;
+ i915_gem_object_put(log->vma->obj);
+ log->relay.buf_in_use = false;
}
void intel_guc_log_init_early(struct intel_guc_log *log)
{
+ struct intel_guc *guc = log_to_guc(log);
+ int n;
+
+ for (n = GUC_DEBUG_LOG_BUFFER; n < GUC_MAX_LOG_BUFFER; n++)
+ mutex_init(&guc->log_state[n].lock);
+
mutex_init(&log->relay.lock);
- INIT_WORK(&log->relay.flush_work, capture_logs_work);
+ INIT_WORK(&log->relay.flush_work, copy_debug_logs_work);
log->relay.started = false;
}
@@ -371,8 +379,11 @@ static int guc_log_relay_create(struct intel_guc_log *log)
lockdep_assert_held(&log->relay.lock);
GEM_BUG_ON(!log->vma);
- /* Keep the size of sub buffers same as shared log buffer */
- subbuf_size = log->vma->size;
+ /*
+ * Keep the size of sub buffers same as shared log buffer
+ * but GuC log-events excludes the error-state-capture logs
+ */
+ subbuf_size = log->vma->size - CAPTURE_BUFFER_SIZE;
/*
* Store up to 8 snapshots, which is large enough to buffer sufficient
@@ -407,13 +418,13 @@ static void guc_log_relay_destroy(struct intel_guc_log *log)
log->relay.channel = NULL;
}
-static void guc_log_capture_logs(struct intel_guc_log *log)
+static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log)
{
struct intel_guc *guc = log_to_guc(log);
struct drm_i915_private *dev_priv = guc_to_gt(guc)->i915;
intel_wakeref_t wakeref;
- guc_read_update_log_buffer(log);
+ _guc_log_copy_debuglogs_for_relay(log);
/*
* Generally device is expected to be active only at this
@@ -453,6 +464,7 @@ int intel_guc_log_create(struct intel_guc_log *log)
{
struct intel_guc *guc = log_to_guc(log);
struct i915_vma *vma;
+ void *vaddr;
u32 guc_log_size;
int ret;
@@ -460,23 +472,29 @@ int intel_guc_log_create(struct intel_guc_log *log)
/*
* GuC Log buffer Layout
+ * (this ordering must follow "enum guc_log_buffer_type" definition)
*
* +===============================+ 00B
- * | Crash dump state header |
- * +-------------------------------+ 32B
* | Debug state header |
+ * +-------------------------------+ 32B
+ * | Crash dump state header |
* +-------------------------------+ 64B
* | Capture state header |
* +-------------------------------+ 96B
* | |
* +===============================+ PAGE_SIZE (4KB)
- * | Crash Dump logs |
- * +===============================+ + CRASH_SIZE
* | Debug logs |
* +===============================+ + DEBUG_SIZE
+ * | Crash Dump logs |
+ * +===============================+ + CRASH_SIZE
+ * | Capture logs |
+ * +===============================+ + CAPTURE_SIZE
*/
- guc_log_size = PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE +
- CAPTURE_BUFFER_SIZE;
+ if (intel_guc_capture_output_min_size_est(guc) > CAPTURE_BUFFER_SIZE)
+ DRM_WARN("GuC log buffer for state_capture maybe too small. %d < %d\n",
+ CAPTURE_BUFFER_SIZE, intel_guc_capture_output_min_size_est(guc));
+
+ guc_log_size = PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE + CAPTURE_BUFFER_SIZE;
vma = intel_guc_allocate_vma(guc, guc_log_size);
if (IS_ERR(vma)) {
@@ -485,6 +503,17 @@ int intel_guc_log_create(struct intel_guc_log *log)
}
log->vma = vma;
+ /*
+ * Create a WC (Uncached for read) vmalloc mapping up front immediate access to
+ * data from memory during critical events such as error capture
+ */
+ vaddr = i915_gem_object_pin_map_unlocked(log->vma->obj, I915_MAP_WC);
+ if (IS_ERR(vaddr)) {
+ ret = PTR_ERR(vaddr);
+ i915_vma_unpin_and_release(&log->vma, 0);
+ goto err;
+ }
+ log->buf_addr = vaddr;
log->level = __get_default_log_level(log);
DRM_DEBUG_DRIVER("guc_log_level=%d (%s, verbose:%s, verbosity:%d)\n",
@@ -495,13 +524,14 @@ int intel_guc_log_create(struct intel_guc_log *log)
return 0;
err:
- DRM_ERROR("Failed to allocate GuC log buffer. %d\n", ret);
+ DRM_ERROR("Failed to allocate or map GuC log buffer. %d\n", ret);
return ret;
}
void intel_guc_log_destroy(struct intel_guc_log *log)
{
- i915_vma_unpin_and_release(&log->vma, 0);
+ log->buf_addr = NULL;
+ i915_vma_unpin_and_release(&log->vma, I915_VMA_RELEASE_MAP);
}
int intel_guc_log_set_level(struct intel_guc_log *log, u32 level)
@@ -546,7 +576,7 @@ int intel_guc_log_set_level(struct intel_guc_log *log, u32 level)
bool intel_guc_log_relay_created(const struct intel_guc_log *log)
{
- return log->relay.buf_addr;
+ return log->buf_addr;
}
int intel_guc_log_relay_open(struct intel_guc_log *log)
@@ -577,7 +607,7 @@ int intel_guc_log_relay_open(struct intel_guc_log *log)
if (ret)
goto out_unlock;
- ret = guc_log_map(log);
+ ret = guc_log_relay_map(log);
if (ret)
goto out_relay;
@@ -629,8 +659,8 @@ void intel_guc_log_relay_flush(struct intel_guc_log *log)
with_intel_runtime_pm(guc_to_gt(guc)->uncore->rpm, wakeref)
guc_action_flush_log(guc);
- /* GuC would have updated log buffer by now, so capture it */
- guc_log_capture_logs(log);
+ /* GuC would have updated log buffer by now, so copy it */
+ guc_log_copy_debuglogs_for_relay(log);
}
/*
@@ -660,7 +690,7 @@ void intel_guc_log_relay_close(struct intel_guc_log *log)
mutex_lock(&log->relay.lock);
GEM_BUG_ON(!intel_guc_log_relay_created(log));
- guc_log_unmap(log);
+ guc_log_relay_unmap(log);
guc_log_relay_destroy(log);
mutex_unlock(&log->relay.lock);
}
@@ -696,6 +726,7 @@ stringify_guc_log_type(enum guc_log_buffer_type type)
*/
void intel_guc_log_info(struct intel_guc_log *log, struct drm_printer *p)
{
+ struct intel_guc *guc = log_to_guc(log);
enum guc_log_buffer_type type;
if (!intel_guc_log_relay_created(log)) {
@@ -710,8 +741,8 @@ void intel_guc_log_info(struct intel_guc_log *log, struct drm_printer *p)
for (type = GUC_DEBUG_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) {
drm_printf(p, "\t%s:\tflush count %10u, overflow count %10u\n",
stringify_guc_log_type(type),
- log->stats[type].flush,
- log->stats[type].sampled_overflow);
+ guc->log_state[type].flush,
+ guc->log_state[type].sampled_overflow);
}
}
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
index d0300909a2c7..a2489996b279 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
@@ -46,23 +46,25 @@ struct intel_guc;
#define GUC_VERBOSITY_TO_LOG_LEVEL(x) ((x) + 2)
#define GUC_LOG_LEVEL_MAX GUC_VERBOSITY_TO_LOG_LEVEL(GUC_LOG_VERBOSITY_MAX)
+struct intel_guc_log_stats {
+ struct mutex lock; /* protects below and guc_log_buffer_state's read-ptr */
+ u32 sampled_overflow;
+ u32 overflow;
+ u32 flush;
+};
+
struct intel_guc_log {
u32 level;
struct i915_vma *vma;
+ void *buf_addr;
struct {
- void *buf_addr;
+ bool buf_in_use;
bool started;
struct work_struct flush_work;
struct rchan *channel;
struct mutex lock;
u32 full_count;
} relay;
- /* logging related stats */
- struct {
- u32 sampled_overflow;
- u32 overflow;
- u32 flush;
- } stats[GUC_MAX_LOG_BUFFER];
};
void intel_guc_log_init_early(struct intel_guc_log *log);
--
2.25.1
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