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Subject[PATCH 2/2] RFC drm/i915: Export per-client debug tracing
Date
Rather than put sensitive, and often voluminous, user details into a
global dmesg, report the error and debug messages directly back to the
user via the kernel tracing mechanism.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 104 ++++++++++-----
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 124 ++++++++++--------
drivers/gpu/drm/i915/gem/i915_gem_pages.c | 6 +-
drivers/gpu/drm/i915/i915_drv.h | 4 +
drivers/gpu/drm/i915/i915_gem.c | 5 +-
include/uapi/drm/i915_drm.h | 7 +
6 files changed, 156 insertions(+), 94 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index e525ead073f7..c136a8c90e27 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -81,6 +81,8 @@

#define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1

+#define CTX_TRACE(ctx, ...) TRACE((ctx)->file_priv->trace, __VA_ARGS__)
+
static struct i915_global_gem_context {
struct i915_global base;
struct kmem_cache *slab_luts;
@@ -158,8 +160,12 @@ lookup_user_engine(struct i915_gem_context *ctx,
engine = intel_engine_lookup_user(ctx->i915,
ci->engine_class,
ci->engine_instance);
- if (!engine)
+ if (!engine) {
+ CTX_TRACE(ctx,
+ "Unknown engine {class:%d, instance:%d}\n",
+ ci->engine_class, ci->engine_instance);
return ERR_PTR(-EINVAL);
+ }

idx = engine->legacy_idx;
} else {
@@ -762,8 +768,6 @@ i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)

ppgtt = i915_ppgtt_create(&i915->gt);
if (IS_ERR(ppgtt)) {
- drm_dbg(&i915->drm, "PPGTT setup failed (%ld)\n",
- PTR_ERR(ppgtt));
context_close(ctx);
return ERR_CAST(ppgtt);
}
@@ -1461,14 +1465,15 @@ set_engines__load_balance(struct i915_user_extension __user *base, void *data)
return -EFAULT;

if (idx >= set->engines->num_engines) {
- drm_dbg(&i915->drm, "Invalid placement value, %d >= %d\n",
- idx, set->engines->num_engines);
+ CTX_TRACE(set->ctx,
+ "Invalid placement value, %d >= %d\n",
+ idx, set->engines->num_engines);
return -EINVAL;
}

idx = array_index_nospec(idx, set->engines->num_engines);
if (set->engines->engines[idx]) {
- drm_dbg(&i915->drm,
+ CTX_TRACE(set->ctx,
"Invalid placement[%d], already occupied\n", idx);
return -EEXIST;
}
@@ -1505,9 +1510,9 @@ set_engines__load_balance(struct i915_user_extension __user *base, void *data)
ci.engine_class,
ci.engine_instance);
if (!siblings[n]) {
- drm_dbg(&i915->drm,
- "Invalid sibling[%d]: { class:%d, inst:%d }\n",
- n, ci.engine_class, ci.engine_instance);
+ CTX_TRACE(set->ctx,
+ "Invalid sibling[%d]: { class:%d, inst:%d }\n",
+ n, ci.engine_class, ci.engine_instance);
err = -EINVAL;
goto out_siblings;
}
@@ -1551,15 +1556,15 @@ set_engines__bond(struct i915_user_extension __user *base, void *data)
return -EFAULT;

if (idx >= set->engines->num_engines) {
- drm_dbg(&i915->drm,
- "Invalid index for virtual engine: %d >= %d\n",
- idx, set->engines->num_engines);
+ CTX_TRACE(set->ctx,
+ "Invalid index for virtual engine: %d >= %d\n",
+ idx, set->engines->num_engines);
return -EINVAL;
}

idx = array_index_nospec(idx, set->engines->num_engines);
if (!set->engines->engines[idx]) {
- drm_dbg(&i915->drm, "Invalid engine at %d\n", idx);
+ CTX_TRACE(set->ctx, "Invalid engine at %d\n", idx);
return -EINVAL;
}
virtual = set->engines->engines[idx]->engine;
@@ -1580,9 +1585,9 @@ set_engines__bond(struct i915_user_extension __user *base, void *data)
master = intel_engine_lookup_user(i915,
ci.engine_class, ci.engine_instance);
if (!master) {
- drm_dbg(&i915->drm,
- "Unrecognised master engine: { class:%u, instance:%u }\n",
- ci.engine_class, ci.engine_instance);
+ CTX_TRACE(set->ctx,
+ "Unrecognised master engine: { class:%u, instance:%u }\n",
+ ci.engine_class, ci.engine_instance);
return -EINVAL;
}

@@ -1599,9 +1604,9 @@ set_engines__bond(struct i915_user_extension __user *base, void *data)
ci.engine_class,
ci.engine_instance);
if (!bond) {
- drm_dbg(&i915->drm,
- "Unrecognised engine[%d] for bonding: { class:%d, instance: %d }\n",
- n, ci.engine_class, ci.engine_instance);
+ CTX_TRACE(set->ctx,
+ "Unrecognised engine[%d] for bonding: { class:%d, instance: %d }\n",
+ n, ci.engine_class, ci.engine_instance);
return -EINVAL;
}

@@ -1701,7 +1706,6 @@ static int
set_engines(struct i915_gem_context *ctx,
const struct drm_i915_gem_context_param *args)
{
- struct drm_i915_private *i915 = ctx->i915;
struct i915_context_param_engines __user *user =
u64_to_user_ptr(args->value);
struct set_engines set = { .ctx = ctx };
@@ -1723,8 +1727,9 @@ set_engines(struct i915_gem_context *ctx,
BUILD_BUG_ON(!IS_ALIGNED(sizeof(*user), sizeof(*user->engines)));
if (args->size < sizeof(*user) ||
!IS_ALIGNED(args->size, sizeof(*user->engines))) {
- drm_dbg(&i915->drm, "Invalid size for engine array: %d\n",
- args->size);
+ CTX_TRACE(ctx,
+ "Invalid size for engine array: %d\n",
+ args->size);
return -EINVAL;
}

@@ -1761,9 +1766,9 @@ set_engines(struct i915_gem_context *ctx,
ci.engine_class,
ci.engine_instance);
if (!engine) {
- drm_dbg(&i915->drm,
- "Invalid engine[%d]: { class:%d, instance:%d }\n",
- n, ci.engine_class, ci.engine_instance);
+ CTX_TRACE(ctx,
+ "Invalid engine[%d]: { class:%d, instance:%d }\n",
+ n, ci.engine_class, ci.engine_instance);
__free_engines(set.engines, n);
return -ENOENT;
}
@@ -1906,6 +1911,36 @@ get_engines(struct i915_gem_context *ctx,
return err;
}

+static int
+get_trace(struct i915_gem_context *ctx,
+ struct drm_i915_gem_context_param *args)
+{
+ int fd;
+
+ if (args->ctx_id) /* single trace per-fd, let's not mix it up! */
+ return -EINVAL;
+
+ if (!READ_ONCE(ctx->file_priv->trace)) {
+ struct trace_array *tr;
+
+ tr = trace_array_create();
+ if (IS_ERR(tr))
+ return PTR_ERR(tr);
+
+ if (cmpxchg(&ctx->file_priv->trace, NULL, tr))
+ trace_array_destroy(tr);
+ }
+
+ fd = anon_trace_getfd("i915-client", ctx->file_priv->trace);
+ if (fd < 0)
+ return fd;
+
+ args->size = 0;
+ args->value = fd;
+
+ return 0;
+}
+
static int
set_persistence(struct i915_gem_context *ctx,
const struct drm_i915_gem_context_param *args)
@@ -1943,8 +1978,13 @@ static int set_priority(struct i915_gem_context *ctx,
return -ENODEV;

if (priority > I915_CONTEXT_MAX_USER_PRIORITY ||
- priority < I915_CONTEXT_MIN_USER_PRIORITY)
+ priority < I915_CONTEXT_MIN_USER_PRIORITY) {
+ CTX_TRACE(ctx, "priority %d out-of-range [%d, %d]\n",
+ priority,
+ I915_CONTEXT_MAX_USER_PRIORITY,
+ I915_CONTEXT_MIN_USER_PRIORITY);
return -EINVAL;
+ }

if (priority > I915_CONTEXT_DEFAULT_PRIORITY &&
!capable(CAP_SYS_NICE))
@@ -2302,9 +2342,9 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,

ext_data.fpriv = file->driver_priv;
if (client_is_banned(ext_data.fpriv)) {
- drm_dbg(&i915->drm,
- "client %s[%d] banned from creating ctx\n",
- current->comm, task_pid_nr(current));
+ TRACE(ext_data.fpriv->trace,
+ "client %s[%d] banned from creating ctx\n",
+ current->comm, task_pid_nr(current));
return -EIO;
}

@@ -2326,7 +2366,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
goto err_ctx;

args->ctx_id = id;
- drm_dbg(&i915->drm, "HW context %d created\n", args->ctx_id);
+ TRACE(ext_data.fpriv->trace, "HW context %d created\n", args->ctx_id);

return 0;

@@ -2480,6 +2520,10 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
ret = get_ringsize(ctx, args);
break;

+ case I915_CONTEXT_PARAM_TRACE:
+ ret = get_trace(ctx, args);
+ break;
+
case I915_CONTEXT_PARAM_BAN_PERIOD:
default:
ret = -EINVAL;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index ac0e5fc5675e..620a0e8da5d8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -275,6 +275,16 @@ struct i915_execbuffer {
struct hlist_head *buckets; /** ht for relocation handles */
};

+static inline struct trace_array *file_trace(struct drm_file *f)
+{
+ struct drm_i915_file_private *fp = f->driver_priv;
+
+ return fp->trace;
+}
+
+#define FILE_TRACE(F, ...) TRACE(file_trace(F), __VA_ARGS__)
+#define EB_TRACE(E, ...) FILE_TRACE((E)->file, __VA_ARGS__)
+
#define exec_entry(EB, VMA) (&(EB)->exec[(VMA)->exec_flags - (EB)->flags])

static inline bool eb_use_cmdparser(const struct i915_execbuffer *eb)
@@ -419,7 +429,6 @@ eb_validate_vma(struct i915_execbuffer *eb,
struct drm_i915_gem_exec_object2 *entry,
struct i915_vma *vma)
{
- struct drm_i915_private *i915 = eb->i915;
if (unlikely(entry->flags & eb->invalid_flags))
return -EINVAL;

@@ -443,9 +452,9 @@ eb_validate_vma(struct i915_execbuffer *eb,
}

if (unlikely(vma->exec_flags)) {
- drm_dbg(&i915->drm,
- "Object [handle %d, index %d] appears more than once in object list\n",
- entry->handle, (int)(entry - eb->exec));
+ EB_TRACE(eb,
+ "Object [handle %d, index %d] appears more than once in object list\n",
+ entry->handle, (int)(entry - eb->exec));
return -EINVAL;
}

@@ -1331,7 +1340,6 @@ eb_relocate_entry(struct i915_execbuffer *eb,
struct i915_vma *vma,
const struct drm_i915_gem_relocation_entry *reloc)
{
- struct drm_i915_private *i915 = eb->i915;
struct i915_vma *target;
int err;

@@ -1342,24 +1350,26 @@ eb_relocate_entry(struct i915_execbuffer *eb,

/* Validate that the target is in a valid r/w GPU domain */
if (unlikely(reloc->write_domain & (reloc->write_domain - 1))) {
- drm_dbg(&i915->drm, "reloc with multiple write domains: "
- "target %d offset %d "
- "read %08x write %08x",
- reloc->target_handle,
- (int) reloc->offset,
- reloc->read_domains,
- reloc->write_domain);
+ EB_TRACE(eb,
+ "reloc with multiple write domains: "
+ "target %d offset %d "
+ "read %08x write %08x",
+ reloc->target_handle,
+ (int) reloc->offset,
+ reloc->read_domains,
+ reloc->write_domain);
return -EINVAL;
}
if (unlikely((reloc->write_domain | reloc->read_domains)
& ~I915_GEM_GPU_DOMAINS)) {
- drm_dbg(&i915->drm, "reloc with read/write non-GPU domains: "
- "target %d offset %d "
- "read %08x write %08x",
- reloc->target_handle,
- (int) reloc->offset,
- reloc->read_domains,
- reloc->write_domain);
+ EB_TRACE(eb,
+ "reloc with read/write non-GPU domains: "
+ "target %d offset %d "
+ "read %08x write %08x",
+ reloc->target_handle,
+ (int) reloc->offset,
+ reloc->read_domains,
+ reloc->write_domain);
return -EINVAL;
}

@@ -1393,18 +1403,20 @@ eb_relocate_entry(struct i915_execbuffer *eb,
/* Check that the relocation address is valid... */
if (unlikely(reloc->offset >
vma->size - (eb->reloc_cache.use_64bit_reloc ? 8 : 4))) {
- drm_dbg(&i915->drm, "Relocation beyond object bounds: "
- "target %d offset %d size %d.\n",
- reloc->target_handle,
- (int)reloc->offset,
- (int)vma->size);
+ EB_TRACE(eb,
+ "Relocation beyond object bounds: "
+ "target %d offset %d size %d.\n",
+ reloc->target_handle,
+ (int)reloc->offset,
+ (int)vma->size);
return -EINVAL;
}
if (unlikely(reloc->offset & 3)) {
- drm_dbg(&i915->drm, "Relocation not 4-byte aligned: "
- "target %d offset %d.\n",
- reloc->target_handle,
- (int)reloc->offset);
+ EB_TRACE(eb,
+ "Relocation not 4-byte aligned: "
+ "target %d offset %d.\n",
+ reloc->target_handle,
+ (int)reloc->offset);
return -EINVAL;
}

@@ -1914,13 +1926,14 @@ static int i915_gem_check_execbuffer(struct drm_i915_gem_execbuffer2 *exec)
return 0;
}

-static int i915_reset_gen7_sol_offsets(struct i915_request *rq)
+static int gen7_sol_reset(struct i915_execbuffer *eb)
{
+ struct i915_request *rq = eb->request;
u32 *cs;
int i;

if (!IS_GEN(rq->i915, 7) || rq->engine->id != RCS0) {
- drm_dbg(&rq->i915->drm, "sol reset is gen7/rcs only\n");
+ EB_TRACE(eb, "sol reset is gen7/rcs only\n");
return -EINVAL;
}

@@ -2074,7 +2087,6 @@ static int eb_parse_pipeline(struct i915_execbuffer *eb,

static int eb_parse(struct i915_execbuffer *eb)
{
- struct drm_i915_private *i915 = eb->i915;
struct intel_engine_pool_node *pool;
struct i915_vma *shadow, *trampoline;
unsigned int len;
@@ -2090,8 +2102,7 @@ static int eb_parse(struct i915_execbuffer *eb)
* post-scan tampering
*/
if (!eb->context->vm->has_read_only) {
- drm_dbg(&i915->drm,
- "Cannot prevent post-scan tampering without RO capable vm\n");
+ EB_TRACE(eb, "Cannot prevent post-scan tampering without RO capable vm\n");
return -EINVAL;
}
} else {
@@ -2173,7 +2184,7 @@ static int eb_submit(struct i915_execbuffer *eb)
return err;

if (eb->args->flags & I915_EXEC_GEN7_SOL_RESET) {
- err = i915_reset_gen7_sol_offsets(eb->request);
+ err = gen7_sol_reset(eb);
if (err)
return err;
}
@@ -2379,9 +2390,9 @@ eb_select_legacy_ring(struct i915_execbuffer *eb,

if (user_ring_id != I915_EXEC_BSD &&
(args->flags & I915_EXEC_BSD_MASK)) {
- drm_dbg(&i915->drm,
- "execbuf with non bsd ring but with invalid "
- "bsd dispatch flags: %d\n", (int)(args->flags));
+ EB_TRACE(eb,
+ "execbuf with non bsd ring but with invalid "
+ "bsd dispatch flags: %d\n", (int)(args->flags));
return -1;
}

@@ -2395,9 +2406,9 @@ eb_select_legacy_ring(struct i915_execbuffer *eb,
bsd_idx >>= I915_EXEC_BSD_SHIFT;
bsd_idx--;
} else {
- drm_dbg(&i915->drm,
- "execbuf with unknown bsd ring: %u\n",
- bsd_idx);
+ EB_TRACE(eb,
+ "execbuf with unknown bsd ring: %u\n",
+ bsd_idx);
return -1;
}

@@ -2405,8 +2416,8 @@ eb_select_legacy_ring(struct i915_execbuffer *eb,
}

if (user_ring_id >= ARRAY_SIZE(user_ring_map)) {
- drm_dbg(&i915->drm, "execbuf with unknown ring: %u\n",
- user_ring_id);
+ EB_TRACE(eb, "execbuf with unknown ring: %u\n",
+ user_ring_id);
return -1;
}

@@ -2680,14 +2691,14 @@ i915_gem_do_execbuffer(struct drm_device *dev,
}

if (unlikely(*eb.batch->exec_flags & EXEC_OBJECT_WRITE)) {
- drm_dbg(&i915->drm,
- "Attempting to use self-modifying batch buffer\n");
+ EB_TRACE(&eb,
+ "Attempting to use self-modifying batch buffer\n");
err = -EINVAL;
goto err_vma;
}
if (eb.batch_start_offset > eb.batch->size ||
eb.batch_len > eb.batch->size - eb.batch_start_offset) {
- drm_dbg(&i915->drm, "Attempting to use out-of-bounds batch\n");
+ EB_TRACE(&eb, "Attempting to use out-of-bounds batch\n");
err = -EINVAL;
goto err_vma;
}
@@ -2851,7 +2862,6 @@ int
i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
- struct drm_i915_private *i915 = to_i915(dev);
struct drm_i915_gem_execbuffer *args = data;
struct drm_i915_gem_execbuffer2 exec2;
struct drm_i915_gem_exec_object *exec_list = NULL;
@@ -2861,7 +2871,7 @@ i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
int err;

if (!check_buffer_count(count)) {
- drm_dbg(&i915->drm, "execbuf2 with %zd buffers\n", count);
+ FILE_TRACE(file, "execbuf2 with %zd buffers\n", count);
return -EINVAL;
}

@@ -2886,9 +2896,9 @@ i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
exec2_list = kvmalloc_array(count + 1, eb_element_size(),
__GFP_NOWARN | GFP_KERNEL);
if (exec_list == NULL || exec2_list == NULL) {
- drm_dbg(&i915->drm,
- "Failed to allocate exec list for %d buffers\n",
- args->buffer_count);
+ FILE_TRACE(file,
+ "Failed to allocate exec list for %d buffers\n",
+ args->buffer_count);
kvfree(exec_list);
kvfree(exec2_list);
return -ENOMEM;
@@ -2897,8 +2907,8 @@ i915_gem_execbuffer_ioctl(struct drm_device *dev, void *data,
u64_to_user_ptr(args->buffers_ptr),
sizeof(*exec_list) * count);
if (err) {
- drm_dbg(&i915->drm, "copy %d exec entries failed %d\n",
- args->buffer_count, err);
+ FILE_TRACE(file, "copy %d exec entries failed %d\n",
+ args->buffer_count, err);
kvfree(exec_list);
kvfree(exec2_list);
return -EFAULT;
@@ -2945,7 +2955,6 @@ int
i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
- struct drm_i915_private *i915 = to_i915(dev);
struct drm_i915_gem_execbuffer2 *args = data;
struct drm_i915_gem_exec_object2 *exec2_list;
struct drm_syncobj **fences = NULL;
@@ -2953,7 +2962,7 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
int err;

if (!check_buffer_count(count)) {
- drm_dbg(&i915->drm, "execbuf2 with %zd buffers\n", count);
+ FILE_TRACE(file, "execbuf2 with %zd buffers\n", count);
return -EINVAL;
}

@@ -2965,14 +2974,15 @@ i915_gem_execbuffer2_ioctl(struct drm_device *dev, void *data,
exec2_list = kvmalloc_array(count + 1, eb_element_size(),
__GFP_NOWARN | GFP_KERNEL);
if (exec2_list == NULL) {
- drm_dbg(&i915->drm, "Failed to allocate exec list for %zd buffers\n",
- count);
+ FILE_TRACE(file,
+ "Failed to allocate exec list for %zd buffers\n",
+ count);
return -ENOMEM;
}
if (copy_from_user(exec2_list,
u64_to_user_ptr(args->buffers_ptr),
sizeof(*exec2_list) * count)) {
- drm_dbg(&i915->drm, "copy %zd exec entries failed\n", count);
+ FILE_TRACE(file, "copy %zd exec entries failed\n", count);
kvfree(exec2_list);
return -EFAULT;
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 24f4cadea114..001ad1c02249 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -83,14 +83,10 @@ void __i915_gem_object_set_pages(struct drm_i915_gem_object *obj,

int ____i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
{
- struct drm_i915_private *i915 = to_i915(obj->base.dev);
int err;

- if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {
- drm_dbg(&i915->drm,
- "Attempting to obtain a purgeable object\n");
+ if (unlikely(obj->mm.madv != I915_MADV_WILLNEED))
return -EFAULT;
- }

err = obj->ops->get_pages(obj);
GEM_BUG_ON(!err && !i915_gem_object_has_pages(obj));
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b621df933212..dccb71735d5d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -46,6 +46,7 @@
#include <linux/dma-resv.h>
#include <linux/shmem_fs.h>
#include <linux/stackdepot.h>
+#include <linux/trace.h>
#include <linux/xarray.h>

#include <drm/intel-gtt.h>
@@ -223,7 +224,10 @@ struct drm_i915_file_private {
/** ban_score: Accumulated score of all ctx bans and fast hangs. */
atomic_t ban_score;
unsigned long hang_timestamp;
+
+ struct trace_array *trace;
};
+#define TRACE(tr, ...) trace_array_printk((tr), _THIS_IP_, __VA_ARGS__)

/* Interface history:
*
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ca5420012a22..baea6be98b0f 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1286,6 +1286,9 @@ void i915_gem_release(struct drm_device *dev, struct drm_file *file)
struct drm_i915_file_private *file_priv = file->driver_priv;
struct i915_request *request;

+ if (file_priv->trace)
+ trace_array_destroy(file_priv->trace);
+
/* Clean up our request list when the client is going away, so that
* later retire_requests won't dereference our soon-to-be-gone
* file_priv.
@@ -1301,8 +1304,6 @@ int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file)
struct drm_i915_file_private *file_priv;
int ret;

- DRM_DEBUG("\n");
-
file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
if (!file_priv)
return -ENOMEM;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 2813e579b480..c69827e04b48 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1640,6 +1640,13 @@ struct drm_i915_gem_context_param {
* Default is 16 KiB.
*/
#define I915_CONTEXT_PARAM_RINGSIZE 0xc
+
+/*
+ * I915_CONTEXT_PARAM_TRACE:
+ *
+ * Return an fd representing a pipe of all trace output from this file.
+ */
+#define I915_CONTEXT_PARAM_TRACE 0xd
/* Must be kept compact -- no holes and well documented */

__u64 value;
--
2.25.1
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