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authorRobert Bragg <robert@sixbynine.org>2016-11-07 19:49:52 +0000
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-11-22 14:38:13 +0100
commitd79651522e89c4ffa8992b48dfe449f0c583f809 (patch)
tree6495a5c3429bc98ca346756f9ae0c98492ce7b48
parent8a3003dd93e2db2e7c8edc316e2978f750ca0dc2 (diff)
drm/i915: Enable i915 perf stream for Haswell OA unit
Gen graphics hardware can be set up to periodically write snapshots of performance counters into a circular buffer via its Observation Architecture and this patch exposes that capability to userspace via the i915 perf interface. v2: Make sure to initialize ->specific_ctx_id when opening, without relying on _pin_notify hook, in case ctx already pinned. v3: Revert back to pinning ctx upfront when opening stream, removing need to hook in to pinning and to update OACONTROL on the fly. Signed-off-by: Robert Bragg <robert@sixbynine.org> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Sourab Gupta <sourab.gupta@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161107194957.3385-7-robert@sixbynine.org
-rw-r--r--drivers/gpu/drm/i915/i915_drv.h66
-rw-r--r--drivers/gpu/drm/i915/i915_perf.c1036
-rw-r--r--drivers/gpu/drm/i915/i915_reg.h338
-rw-r--r--include/uapi/drm/i915_drm.h71
4 files changed, 1482 insertions, 29 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b11506f65936..3a69e219c7a2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1797,6 +1797,11 @@ struct intel_wm_config {
bool sprites_scaled;
};
+struct i915_oa_format {
+ u32 format;
+ int size;
+};
+
struct i915_oa_reg {
i915_reg_t addr;
u32 value;
@@ -1817,11 +1822,6 @@ struct i915_perf_stream_ops {
*/
void (*disable)(struct i915_perf_stream *stream);
- /* Return: true if any i915 perf records are ready to read()
- * for this stream.
- */
- bool (*can_read)(struct i915_perf_stream *stream);
-
/* Call poll_wait, passing a wait queue that will be woken
* once there is something ready to read() for the stream
*/
@@ -1831,9 +1831,7 @@ struct i915_perf_stream_ops {
/* For handling a blocking read, wait until there is something
* to ready to read() for the stream. E.g. wait on the same
- * wait queue that would be passed to poll_wait() until
- * ->can_read() returns true (if its safe to call ->can_read()
- * without the i915 perf lock held).
+ * wait queue that would be passed to poll_wait().
*/
int (*wait_unlocked)(struct i915_perf_stream *stream);
@@ -1873,11 +1871,28 @@ struct i915_perf_stream {
struct list_head link;
u32 sample_flags;
+ int sample_size;
struct i915_gem_context *ctx;
bool enabled;
- struct i915_perf_stream_ops *ops;
+ const struct i915_perf_stream_ops *ops;
+};
+
+struct i915_oa_ops {
+ void (*init_oa_buffer)(struct drm_i915_private *dev_priv);
+ int (*enable_metric_set)(struct drm_i915_private *dev_priv);
+ void (*disable_metric_set)(struct drm_i915_private *dev_priv);
+ void (*oa_enable)(struct drm_i915_private *dev_priv);
+ void (*oa_disable)(struct drm_i915_private *dev_priv);
+ void (*update_oacontrol)(struct drm_i915_private *dev_priv);
+ void (*update_hw_ctx_id_locked)(struct drm_i915_private *dev_priv,
+ u32 ctx_id);
+ int (*read)(struct i915_perf_stream *stream,
+ char __user *buf,
+ size_t count,
+ size_t *offset);
+ bool (*oa_buffer_is_empty)(struct drm_i915_private *dev_priv);
};
struct drm_i915_private {
@@ -2177,16 +2192,47 @@ struct drm_i915_private {
struct {
bool initialized;
+
struct mutex lock;
struct list_head streams;
+ spinlock_t hook_lock;
+
struct {
- u32 metrics_set;
+ struct i915_perf_stream *exclusive_stream;
+
+ u32 specific_ctx_id;
+ struct i915_vma *pinned_rcs_vma;
+
+ struct hrtimer poll_check_timer;
+ wait_queue_head_t poll_wq;
+ bool pollin;
+
+ bool periodic;
+ int period_exponent;
+ int timestamp_frequency;
+
+ int tail_margin;
+
+ int metrics_set;
const struct i915_oa_reg *mux_regs;
int mux_regs_len;
const struct i915_oa_reg *b_counter_regs;
int b_counter_regs_len;
+
+ struct {
+ struct i915_vma *vma;
+ u8 *vaddr;
+ int format;
+ int format_size;
+ } oa_buffer;
+
+ u32 gen7_latched_oastatus1;
+
+ struct i915_oa_ops ops;
+ const struct i915_oa_format *oa_formats;
+ int n_builtin_sets;
} oa;
} perf;
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 777ce65f910d..54653bcf0d79 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -25,16 +25,899 @@
*/
#include <linux/anon_inodes.h>
+#include <linux/sizes.h>
#include "i915_drv.h"
+#include "i915_oa_hsw.h"
+
+/* HW requires this to be a power of two, between 128k and 16M, though driver
+ * is currently generally designed assuming the largest 16M size is used such
+ * that the overflow cases are unlikely in normal operation.
+ */
+#define OA_BUFFER_SIZE SZ_16M
+
+#define OA_TAKEN(tail, head) ((tail - head) & (OA_BUFFER_SIZE - 1))
+
+/* There's a HW race condition between OA unit tail pointer register updates and
+ * writes to memory whereby the tail pointer can sometimes get ahead of what's
+ * been written out to the OA buffer so far.
+ *
+ * Although this can be observed explicitly by checking for a zeroed report-id
+ * field in tail reports, it seems preferable to account for this earlier e.g.
+ * as part of the _oa_buffer_is_empty checks to minimize -EAGAIN polling cycles
+ * in this situation.
+ *
+ * To give time for the most recent reports to land before they may be copied to
+ * userspace, the driver operates as if the tail pointer effectively lags behind
+ * the HW tail pointer by 'tail_margin' bytes. The margin in bytes is calculated
+ * based on this constant in nanoseconds, the current OA sampling exponent
+ * and current report size.
+ *
+ * There is also a fallback check while reading to simply skip over reports with
+ * a zeroed report-id.
+ */
+#define OA_TAIL_MARGIN_NSEC 100000ULL
+
+/* frequency for checking whether the OA unit has written new reports to the
+ * circular OA buffer...
+ */
+#define POLL_FREQUENCY 200
+#define POLL_PERIOD (NSEC_PER_SEC / POLL_FREQUENCY)
+
+/* The maximum exponent the hardware accepts is 63 (essentially it selects one
+ * of the 64bit timestamp bits to trigger reports from) but there's currently
+ * no known use case for sampling as infrequently as once per 47 thousand years.
+ *
+ * Since the timestamps included in OA reports are only 32bits it seems
+ * reasonable to limit the OA exponent where it's still possible to account for
+ * overflow in OA report timestamps.
+ */
+#define OA_EXPONENT_MAX 31
+
+#define INVALID_CTX_ID 0xffffffff
+
+
+/* XXX: beware if future OA HW adds new report formats that the current
+ * code assumes all reports have a power-of-two size and ~(size - 1) can
+ * be used as a mask to align the OA tail pointer.
+ */
+static struct i915_oa_format hsw_oa_formats[I915_OA_FORMAT_MAX] = {
+ [I915_OA_FORMAT_A13] = { 0, 64 },
+ [I915_OA_FORMAT_A29] = { 1, 128 },
+ [I915_OA_FORMAT_A13_B8_C8] = { 2, 128 },
+ /* A29_B8_C8 Disallowed as 192 bytes doesn't factor into buffer size */
+ [I915_OA_FORMAT_B4_C8] = { 4, 64 },
+ [I915_OA_FORMAT_A45_B8_C8] = { 5, 256 },
+ [I915_OA_FORMAT_B4_C8_A16] = { 6, 128 },
+ [I915_OA_FORMAT_C4_B8] = { 7, 64 },
+};
+
+#define SAMPLE_OA_REPORT (1<<0)
struct perf_open_properties {
u32 sample_flags;
u64 single_context:1;
u64 ctx_handle;
+
+ /* OA sampling state */
+ int metrics_set;
+ int oa_format;
+ bool oa_periodic;
+ int oa_period_exponent;
+};
+
+/* NB: This is either called via fops or the poll check hrtimer (atomic ctx)
+ *
+ * It's safe to read OA config state here unlocked, assuming that this is only
+ * called while the stream is enabled, while the global OA configuration can't
+ * be modified.
+ *
+ * Note: we don't lock around the head/tail reads even though there's the slim
+ * possibility of read() fop errors forcing a re-init of the OA buffer
+ * pointers. A race here could result in a false positive !empty status which
+ * is acceptable.
+ */
+static bool gen7_oa_buffer_is_empty_fop_unlocked(struct drm_i915_private *dev_priv)
+{
+ int report_size = dev_priv->perf.oa.oa_buffer.format_size;
+ u32 oastatus2 = I915_READ(GEN7_OASTATUS2);
+ u32 oastatus1 = I915_READ(GEN7_OASTATUS1);
+ u32 head = oastatus2 & GEN7_OASTATUS2_HEAD_MASK;
+ u32 tail = oastatus1 & GEN7_OASTATUS1_TAIL_MASK;
+
+ return OA_TAKEN(tail, head) <
+ dev_priv->perf.oa.tail_margin + report_size;
+}
+
+/**
+ * Appends a status record to a userspace read() buffer.
+ */
+static int append_oa_status(struct i915_perf_stream *stream,
+ char __user *buf,
+ size_t count,
+ size_t *offset,
+ enum drm_i915_perf_record_type type)
+{
+ struct drm_i915_perf_record_header header = { type, 0, sizeof(header) };
+
+ if ((count - *offset) < header.size)
+ return -ENOSPC;
+
+ if (copy_to_user(buf + *offset, &header, sizeof(header)))
+ return -EFAULT;
+
+ (*offset) += header.size;
+
+ return 0;
+}
+
+/**
+ * Copies single OA report into userspace read() buffer.
+ */
+static int append_oa_sample(struct i915_perf_stream *stream,
+ char __user *buf,
+ size_t count,
+ size_t *offset,
+ const u8 *report)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+ int report_size = dev_priv->perf.oa.oa_buffer.format_size;
+ struct drm_i915_perf_record_header header;
+ u32 sample_flags = stream->sample_flags;
+
+ header.type = DRM_I915_PERF_RECORD_SAMPLE;
+ header.pad = 0;
+ header.size = stream->sample_size;
+
+ if ((count - *offset) < header.size)
+ return -ENOSPC;
+
+ buf += *offset;
+ if (copy_to_user(buf, &header, sizeof(header)))
+ return -EFAULT;
+ buf += sizeof(header);
+
+ if (sample_flags & SAMPLE_OA_REPORT) {
+ if (copy_to_user(buf, report, report_size))
+ return -EFAULT;
+ }
+
+ (*offset) += header.size;
+
+ return 0;
+}
+
+/**
+ * Copies all buffered OA reports into userspace read() buffer.
+ * @stream: An i915-perf stream opened for OA metrics
+ * @buf: destination buffer given by userspace
+ * @count: the number of bytes userspace wants to read
+ * @offset: (inout): the current position for writing into @buf
+ * @head_ptr: (inout): the current oa buffer cpu read position
+ * @tail: the current oa buffer gpu write position
+ *
+ * Returns 0 on success, negative error code on failure.
+ *
+ * Notably any error condition resulting in a short read (-ENOSPC or
+ * -EFAULT) will be returned even though one or more records may
+ * have been successfully copied. In this case it's up to the caller
+ * to decide if the error should be squashed before returning to
+ * userspace.
+ *
+ * Note: reports are consumed from the head, and appended to the
+ * tail, so the head chases the tail?... If you think that's mad
+ * and back-to-front you're not alone, but this follows the
+ * Gen PRM naming convention.
+ */
+static int gen7_append_oa_reports(struct i915_perf_stream *stream,
+ char __user *buf,
+ size_t count,
+ size_t *offset,
+ u32 *head_ptr,
+ u32 tail)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+ int report_size = dev_priv->perf.oa.oa_buffer.format_size;
+ u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr;
+ int tail_margin = dev_priv->perf.oa.tail_margin;
+ u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
+ u32 mask = (OA_BUFFER_SIZE - 1);
+ u32 head;
+ u32 taken;
+ int ret = 0;
+
+ if (WARN_ON(!stream->enabled))
+ return -EIO;
+
+ head = *head_ptr - gtt_offset;
+ tail -= gtt_offset;
+
+ /* The OA unit is expected to wrap the tail pointer according to the OA
+ * buffer size and since we should never write a misaligned head
+ * pointer we don't expect to read one back either...
+ */
+ if (tail > OA_BUFFER_SIZE || head > OA_BUFFER_SIZE ||
+ head % report_size) {
+ DRM_ERROR("Inconsistent OA buffer pointer (head = %u, tail = %u): force restart\n",
+ head, tail);
+ dev_priv->perf.oa.ops.oa_disable(dev_priv);
+ dev_priv->perf.oa.ops.oa_enable(dev_priv);
+ *head_ptr = I915_READ(GEN7_OASTATUS2) &
+ GEN7_OASTATUS2_HEAD_MASK;
+ return -EIO;
+ }
+
+
+ /* The tail pointer increases in 64 byte increments, not in report_size
+ * steps...
+ */
+ tail &= ~(report_size - 1);
+
+ /* Move the tail pointer back by the current tail_margin to account for
+ * the possibility that the latest reports may not have really landed
+ * in memory yet...
+ */
+
+ if (OA_TAKEN(tail, head) < report_size + tail_margin)
+ return -EAGAIN;
+
+ tail -= tail_margin;
+ tail &= mask;
+
+ for (/* none */;
+ (taken = OA_TAKEN(tail, head));
+ head = (head + report_size) & mask) {
+ u8 *report = oa_buf_base + head;
+ u32 *report32 = (void *)report;
+
+ /* All the report sizes factor neatly into the buffer
+ * size so we never expect to see a report split
+ * between the beginning and end of the buffer.
+ *
+ * Given the initial alignment check a misalignment
+ * here would imply a driver bug that would result
+ * in an overrun.
+ */
+ if (WARN_ON((OA_BUFFER_SIZE - head) < report_size)) {
+ DRM_ERROR("Spurious OA head ptr: non-integral report offset\n");
+ break;
+ }
+
+ /* The report-ID field for periodic samples includes
+ * some undocumented flags related to what triggered
+ * the report and is never expected to be zero so we
+ * can check that the report isn't invalid before
+ * copying it to userspace...
+ */
+ if (report32[0] == 0) {
+ DRM_ERROR("Skipping spurious, invalid OA report\n");
+ continue;
+ }
+
+ ret = append_oa_sample(stream, buf, count, offset, report);
+ if (ret)
+ break;
+
+ /* The above report-id field sanity check is based on
+ * the assumption that the OA buffer is initially
+ * zeroed and we reset the field after copying so the
+ * check is still meaningful once old reports start
+ * being overwritten.
+ */
+ report32[0] = 0;
+ }
+
+ *head_ptr = gtt_offset + head;
+
+ return ret;
+}
+
+static int gen7_oa_read(struct i915_perf_stream *stream,
+ char __user *buf,
+ size_t count,
+ size_t *offset)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+ int report_size = dev_priv->perf.oa.oa_buffer.format_size;
+ u32 oastatus2;
+ u32 oastatus1;
+ u32 head;
+ u32 tail;
+ int ret;
+
+ if (WARN_ON(!dev_priv->perf.oa.oa_buffer.vaddr))
+ return -EIO;
+
+ oastatus2 = I915_READ(GEN7_OASTATUS2);
+ oastatus1 = I915_READ(GEN7_OASTATUS1);
+
+ head = oastatus2 & GEN7_OASTATUS2_HEAD_MASK;
+ tail = oastatus1 & GEN7_OASTATUS1_TAIL_MASK;
+
+ /* XXX: On Haswell we don't have a safe way to clear oastatus1
+ * bits while the OA unit is enabled (while the tail pointer
+ * may be updated asynchronously) so we ignore status bits
+ * that have already been reported to userspace.
+ */
+ oastatus1 &= ~dev_priv->perf.oa.gen7_latched_oastatus1;
+
+ /* We treat OABUFFER_OVERFLOW as a significant error:
+ *
+ * - The status can be interpreted to mean that the buffer is
+ * currently full (with a higher precedence than OA_TAKEN()
+ * which will start to report a near-empty buffer after an
+ * overflow) but it's awkward that we can't clear the status
+ * on Haswell, so without a reset we won't be able to catch
+ * the state again.
+ *
+ * - Since it also implies the HW has started overwriting old
+ * reports it may also affect our sanity checks for invalid
+ * reports when copying to userspace that assume new reports
+ * are being written to cleared memory.
+ *
+ * - In the future we may want to introduce a flight recorder
+ * mode where the driver will automatically maintain a safe
+ * guard band between head/tail, avoiding this overflow
+ * condition, but we avoid the added driver complexity for
+ * now.
+ */
+ if (unlikely(oastatus1 & GEN7_OASTATUS1_OABUFFER_OVERFLOW)) {
+ ret = append_oa_status(stream, buf, count, offset,
+ DRM_I915_PERF_RECORD_OA_BUFFER_LOST);
+ if (ret)
+ return ret;
+
+ DRM_ERROR("OA buffer overflow: force restart\n");
+
+ dev_priv->perf.oa.ops.oa_disable(dev_priv);
+ dev_priv->perf.oa.ops.oa_enable(dev_priv);
+
+ oastatus2 = I915_READ(GEN7_OASTATUS2);
+ oastatus1 = I915_READ(GEN7_OASTATUS1);
+
+ head = oastatus2 & GEN7_OASTATUS2_HEAD_MASK;
+ tail = oastatus1 & GEN7_OASTATUS1_TAIL_MASK;
+ }
+
+ if (unlikely(oastatus1 & GEN7_OASTATUS1_REPORT_LOST)) {
+ ret = append_oa_status(stream, buf, count, offset,
+ DRM_I915_PERF_RECORD_OA_REPORT_LOST);
+ if (ret)
+ return ret;
+ dev_priv->perf.oa.gen7_latched_oastatus1 |=
+ GEN7_OASTATUS1_REPORT_LOST;
+ }
+
+ ret = gen7_append_oa_reports(stream, buf, count, offset,
+ &head, tail);
+
+ /* All the report sizes are a power of two and the
+ * head should always be incremented by some multiple
+ * of the report size.
+ *
+ * A warning here, but notably if we later read back a
+ * misaligned pointer we will treat that as a bug since
+ * it could lead to a buffer overrun.
+ */
+ WARN_ONCE(head & (report_size - 1),
+ "i915: Writing misaligned OA head pointer");
+
+ /* Note: we update the head pointer here even if an error
+ * was returned since the error may represent a short read
+ * where some some reports were successfully copied.
+ */
+ I915_WRITE(GEN7_OASTATUS2,
+ ((head & GEN7_OASTATUS2_HEAD_MASK) |
+ OA_MEM_SELECT_GGTT));
+
+ return ret;
+}
+
+static int i915_oa_wait_unlocked(struct i915_perf_stream *stream)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ /* We would wait indefinitely if periodic sampling is not enabled */
+ if (!dev_priv->perf.oa.periodic)
+ return -EIO;
+
+ /* Note: the oa_buffer_is_empty() condition is ok to run unlocked as it
+ * just performs mmio reads of the OA buffer head + tail pointers and
+ * it's assumed we're handling some operation that implies the stream
+ * can't be destroyed until completion (such as a read()) that ensures
+ * the device + OA buffer can't disappear
+ */
+ return wait_event_interruptible(dev_priv->perf.oa.poll_wq,
+ !dev_priv->perf.oa.ops.oa_buffer_is_empty(dev_priv));
+}
+
+static void i915_oa_poll_wait(struct i915_perf_stream *stream,
+ struct file *file,
+ poll_table *wait)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ poll_wait(file, &dev_priv->perf.oa.poll_wq, wait);
+}
+
+static int i915_oa_read(struct i915_perf_stream *stream,
+ char __user *buf,
+ size_t count,
+ size_t *offset)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ return dev_priv->perf.oa.ops.read(stream, buf, count, offset);
+}
+
+/* Determine the render context hw id, and ensure it remains fixed for the
+ * lifetime of the stream. This ensures that we don't have to worry about
+ * updating the context ID in OACONTROL on the fly.
+ */
+static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+ struct i915_vma *vma;
+ int ret;
+
+ ret = i915_mutex_lock_interruptible(&dev_priv->drm);
+ if (ret)
+ return ret;
+
+ /* As the ID is the gtt offset of the context's vma we pin
+ * the vma to ensure the ID remains fixed.
+ *
+ * NB: implied RCS engine...
+ */
+ vma = i915_gem_context_pin_legacy(stream->ctx, 0);
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
+ goto unlock;
+ }
+
+ dev_priv->perf.oa.pinned_rcs_vma = vma;
+
+ /* Explicitly track the ID (instead of calling i915_ggtt_offset()
+ * on the fly) considering the difference with gen8+ and
+ * execlists
+ */
+ dev_priv->perf.oa.specific_ctx_id = i915_ggtt_offset(vma);
+
+unlock:
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+
+ return ret;
+}
+
+static void oa_put_render_ctx_id(struct i915_perf_stream *stream)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ mutex_lock(&dev_priv->drm.struct_mutex);
+
+ i915_vma_unpin(dev_priv->perf.oa.pinned_rcs_vma);
+ dev_priv->perf.oa.pinned_rcs_vma = NULL;
+
+ dev_priv->perf.oa.specific_ctx_id = INVALID_CTX_ID;
+
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+}
+
+static void
+free_oa_buffer(struct drm_i915_private *i915)
+{
+ mutex_lock(&i915->drm.struct_mutex);
+
+ i915_gem_object_unpin_map(i915->perf.oa.oa_buffer.vma->obj);
+ i915_vma_unpin(i915->perf.oa.oa_buffer.vma);
+ i915_gem_object_put(i915->perf.oa.oa_buffer.vma->obj);
+
+ i915->perf.oa.oa_buffer.vma = NULL;
+ i915->perf.oa.oa_buffer.vaddr = NULL;
+
+ mutex_unlock(&i915->drm.struct_mutex);
+}
+
+static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ BUG_ON(stream != dev_priv->perf.oa.exclusive_stream);
+
+ dev_priv->perf.oa.ops.disable_metric_set(dev_priv);
+
+ free_oa_buffer(dev_priv);
+
+ intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+ intel_runtime_pm_put(dev_priv);
+
+ if (stream->ctx)
+ oa_put_render_ctx_id(stream);
+
+ dev_priv->perf.oa.exclusive_stream = NULL;
+}
+
+static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
+{
+ u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
+
+ /* Pre-DevBDW: OABUFFER must be set with counters off,
+ * before OASTATUS1, but after OASTATUS2
+ */
+ I915_WRITE(GEN7_OASTATUS2, gtt_offset | OA_MEM_SELECT_GGTT); /* head */
+ I915_WRITE(GEN7_OABUFFER, gtt_offset);
+ I915_WRITE(GEN7_OASTATUS1, gtt_offset | OABUFFER_SIZE_16M); /* tail */
+
+ /* On Haswell we have to track which OASTATUS1 flags we've
+ * already seen since they can't be cleared while periodic
+ * sampling is enabled.
+ */
+ dev_priv->perf.oa.gen7_latched_oastatus1 = 0;
+
+ /* NB: although the OA buffer will initially be allocated
+ * zeroed via shmfs (and so this memset is redundant when
+ * first allocating), we may re-init the OA buffer, either
+ * when re-enabling a stream or in error/reset paths.
+ *
+ * The reason we clear the buffer for each re-init is for the
+ * sanity check in gen7_append_oa_reports() that looks at the
+ * report-id field to make sure it's non-zero which relies on
+ * the assumption that new reports are being written to zeroed
+ * memory...
+ */
+ memset(dev_priv->perf.oa.oa_buffer.vaddr, 0, OA_BUFFER_SIZE);
+
+ /* Maybe make ->pollin per-stream state if we support multiple
+ * concurrent streams in the future.
+ */
+ dev_priv->perf.oa.pollin = false;
+}
+
+static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
+{
+ struct drm_i915_gem_object *bo;
+ struct i915_vma *vma;
+ int ret;
+
+ if (WARN_ON(dev_priv->perf.oa.oa_buffer.vma))
+ return -ENODEV;
+
+ ret = i915_mutex_lock_interruptible(&dev_priv->drm);
+ if (ret)
+ return ret;
+
+ BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE);
+ BUILD_BUG_ON(OA_BUFFER_SIZE < SZ_128K || OA_BUFFER_SIZE > SZ_16M);
+
+ bo = i915_gem_object_create(&dev_priv->drm, OA_BUFFER_SIZE);
+ if (IS_ERR(bo)) {
+ DRM_ERROR("Failed to allocate OA buffer\n");
+ ret = PTR_ERR(bo);
+ goto unlock;
+ }
+
+ ret = i915_gem_object_set_cache_level(bo, I915_CACHE_LLC);
+ if (ret)
+ goto err_unref;
+
+ /* PreHSW required 512K alignment, HSW requires 16M */
+ vma = i915_gem_object_ggtt_pin(bo, NULL, 0, SZ_16M, 0);
+ if (IS_ERR(vma)) {
+ ret = PTR_ERR(vma);
+ goto err_unref;
+ }
+ dev_priv->perf.oa.oa_buffer.vma = vma;
+
+ dev_priv->perf.oa.oa_buffer.vaddr =
+ i915_gem_object_pin_map(bo, I915_MAP_WB);
+ if (IS_ERR(dev_priv->perf.oa.oa_buffer.vaddr)) {
+ ret = PTR_ERR(dev_priv->perf.oa.oa_buffer.vaddr);
+ goto err_unpin;
+ }
+
+ dev_priv->perf.oa.ops.init_oa_buffer(dev_priv);
+
+ DRM_DEBUG_DRIVER("OA Buffer initialized, gtt offset = 0x%x, vaddr = %p\n",
+ i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma),
+ dev_priv->perf.oa.oa_buffer.vaddr);
+
+ goto unlock;
+
+err_unpin:
+ __i915_vma_unpin(vma);
+
+err_unref:
+ i915_gem_object_put(bo);
+
+ dev_priv->perf.oa.oa_buffer.vaddr = NULL;
+ dev_priv->perf.oa.oa_buffer.vma = NULL;
+
+unlock:
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+ return ret;
+}
+
+static void config_oa_regs(struct drm_i915_private *dev_priv,
+ const struct i915_oa_reg *regs,
+ int n_regs)
+{
+ int i;
+
+ for (i = 0; i < n_regs; i++) {
+ const struct i915_oa_reg *reg = regs + i;
+
+ I915_WRITE(reg->addr, reg->value);
+ }
+}
+
+static int hsw_enable_metric_set(struct drm_i915_private *dev_priv)
+{
+ int ret = i915_oa_select_metric_set_hsw(dev_priv);
+
+ if (ret)
+ return ret;
+
+ I915_WRITE(GDT_CHICKEN_BITS, (I915_READ(GDT_CHICKEN_BITS) |
+ GT_NOA_ENABLE));
+
+ /* PRM:
+ *
+ * OA unit is using “crclk” for its functionality. When trunk
+ * level clock gating takes place, OA clock would be gated,
+ * unable to count the events from non-render clock domain.
+ * Render clock gating must be disabled when OA is enabled to
+ * count the events from non-render domain. Unit level clock
+ * gating for RCS should also be disabled.
+ */
+ I915_WRITE(GEN7_MISCCPCTL, (I915_READ(GEN7_MISCCPCTL) &
+ ~GEN7_DOP_CLOCK_GATE_ENABLE));
+ I915_WRITE(GEN6_UCGCTL1, (I915_READ(GEN6_UCGCTL1) |
+ GEN6_CSUNIT_CLOCK_GATE_DISABLE));
+
+ config_oa_regs(dev_priv, dev_priv->perf.oa.mux_regs,
+ dev_priv->perf.oa.mux_regs_len);
+
+ /* It apparently takes a fairly long time for a new MUX
+ * configuration to be be applied after these register writes.
+ * This delay duration was derived empirically based on the
+ * render_basic config but hopefully it covers the maximum
+ * configuration latency.
+ *
+ * As a fallback, the checks in _append_oa_reports() to skip
+ * invalid OA reports do also seem to work to discard reports
+ * generated before this config has completed - albeit not
+ * silently.
+ *
+ * Unfortunately this is essentially a magic number, since we
+ * don't currently know of a reliable mechanism for predicting
+ * how long the MUX config will take to apply and besides
+ * seeing invalid reports we don't know of a reliable way to
+ * explicitly check that the MUX config has landed.
+ *
+ * It's even possible we've miss characterized the underlying
+ * problem - it just seems like the simplest explanation why
+ * a delay at this location would mitigate any invalid reports.
+ */
+ usleep_range(15000, 20000);
+
+ config_oa_regs(dev_priv, dev_priv->perf.oa.b_counter_regs,
+ dev_priv->perf.oa.b_counter_regs_len);
+
+ return 0;
+}
+
+static void hsw_disable_metric_set(struct drm_i915_private *dev_priv)
+{
+ I915_WRITE(GEN6_UCGCTL1, (I915_READ(GEN6_UCGCTL1) &
+ ~GEN6_CSUNIT_CLOCK_GATE_DISABLE));
+ I915_WRITE(GEN7_MISCCPCTL, (I915_READ(GEN7_MISCCPCTL) |
+ GEN7_DOP_CLOCK_GATE_ENABLE));
+
+ I915_WRITE(GDT_CHICKEN_BITS, (I915_READ(GDT_CHICKEN_BITS) &
+ ~GT_NOA_ENABLE));
+}
+
+static void gen7_update_oacontrol_locked(struct drm_i915_private *dev_priv)
+{
+ assert_spin_locked(&dev_priv->perf.hook_lock);
+
+ if (dev_priv->perf.oa.exclusive_stream->enabled) {
+ struct i915_gem_context *ctx =
+ dev_priv->perf.oa.exclusive_stream->ctx;
+ u32 ctx_id = dev_priv->perf.oa.specific_ctx_id;
+
+ bool periodic = dev_priv->perf.oa.periodic;
+ u32 period_exponent = dev_priv->perf.oa.period_exponent;
+ u32 report_format = dev_priv->perf.oa.oa_buffer.format;
+
+ I915_WRITE(GEN7_OACONTROL,
+ (ctx_id & GEN7_OACONTROL_CTX_MASK) |
+ (period_exponent <<
+ GEN7_OACONTROL_TIMER_PERIOD_SHIFT) |
+ (periodic ? GEN7_OACONTROL_TIMER_ENABLE : 0) |
+ (report_format << GEN7_OACONTROL_FORMAT_SHIFT) |
+ (ctx ? GEN7_OACONTROL_PER_CTX_ENABLE : 0) |
+ GEN7_OACONTROL_ENABLE);
+ } else
+ I915_WRITE(GEN7_OACONTROL, 0);
+}
+
+static void gen7_oa_enable(struct drm_i915_private *dev_priv)
+{
+ unsigned long flags;
+
+ /* Reset buf pointers so we don't forward reports from before now.
+ *
+ * Think carefully if considering trying to avoid this, since it
+ * also ensures status flags and the buffer itself are cleared
+ * in error paths, and we have checks for invalid reports based
+ * on the assumption that certain fields are written to zeroed
+ * memory which this helps maintains.
+ */
+ gen7_init_oa_buffer(dev_priv);
+
+ spin_lock_irqsave(&dev_priv->perf.hook_lock, flags);
+ gen7_update_oacontrol_locked(dev_priv);
+ spin_unlock_irqrestore(&dev_priv->perf.hook_lock, flags);
+}
+
+static void i915_oa_stream_enable(struct i915_perf_stream *stream)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ dev_priv->perf.oa.ops.oa_enable(dev_priv);
+
+ if (dev_priv->perf.oa.periodic)
+ hrtimer_start(&dev_priv->perf.oa.poll_check_timer,
+ ns_to_ktime(POLL_PERIOD),
+ HRTIMER_MODE_REL_PINNED);
+}
+
+static void gen7_oa_disable(struct drm_i915_private *dev_priv)
+{
+ I915_WRITE(GEN7_OACONTROL, 0);
+}
+
+static void i915_oa_stream_disable(struct i915_perf_stream *stream)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+
+ dev_priv->perf.oa.ops.oa_disable(dev_priv);
+
+ if (dev_priv->perf.oa.periodic)
+ hrtimer_cancel(&dev_priv->perf.oa.poll_check_timer);
+}
+
+static u64 oa_exponent_to_ns(struct drm_i915_private *dev_priv, int exponent)
+{
+ return 1000000000ULL * (2ULL << exponent) /
+ dev_priv->perf.oa.timestamp_frequency;
+}
+
+static const struct i915_perf_stream_ops i915_oa_stream_ops = {
+ .destroy = i915_oa_stream_destroy,
+ .enable = i915_oa_stream_enable,
+ .disable = i915_oa_stream_disable,
+ .wait_unlocked = i915_oa_wait_unlocked,
+ .poll_wait = i915_oa_poll_wait,
+ .read = i915_oa_read,
};
+static int i915_oa_stream_init(struct i915_perf_stream *stream,
+ struct drm_i915_perf_open_param *param,
+ struct perf_open_properties *props)
+{
+ struct drm_i915_private *dev_priv = stream->dev_priv;
+ int format_size;
+ int ret;
+
+ if (!(props->sample_flags & SAMPLE_OA_REPORT)) {
+ DRM_ERROR("Only OA report sampling supported\n");
+ return -EINVAL;
+ }
+
+ if (!dev_priv->perf.oa.ops.init_oa_buffer) {
+ DRM_ERROR("OA unit not supported\n");
+ return -ENODEV;
+ }
+
+ /* To avoid the complexity of having to accurately filter
+ * counter reports and marshal to the appropriate client
+ * we currently only allow exclusive access
+ */
+ if (dev_priv->perf.oa.exclusive_stream) {
+ DRM_ERROR("OA unit already in use\n");
+ return -EBUSY;
+ }
+
+ if (!props->metrics_set) {
+ DRM_ERROR("OA metric set not specified\n");
+ return -EINVAL;
+ }
+
+ if (!props->oa_format) {
+ DRM_ERROR("OA report format not specified\n");
+ return -EINVAL;
+ }
+
+ stream->sample_size = sizeof(struct drm_i915_perf_record_header);
+
+ format_size = dev_priv->perf.oa.oa_formats[props->oa_format].size;
+
+ stream->sample_flags |= SAMPLE_OA_REPORT;
+ stream->sample_size += format_size;
+
+ dev_priv->perf.oa.oa_buffer.format_size = format_size;
+ if (WARN_ON(dev_priv->perf.oa.oa_buffer.format_size == 0))
+ return -EINVAL;
+
+ dev_priv->perf.oa.oa_buffer.format =
+ dev_priv->perf.oa.oa_formats[props->oa_format].format;
+
+ dev_priv->perf.oa.metrics_set = props->metrics_set;
+
+ dev_priv->perf.oa.periodic = props->oa_periodic;
+ if (dev_priv->perf.oa.periodic) {
+ u64 period_ns = oa_exponent_to_ns(dev_priv,
+ props->oa_period_exponent);
+
+ dev_priv->perf.oa.period_exponent = props->oa_period_exponent;
+
+ /* See comment for OA_TAIL_MARGIN_NSEC for details
+ * about this tail_margin...
+ */
+ dev_priv->perf.oa.tail_margin =
+ ((OA_TAIL_MARGIN_NSEC / period_ns) + 1) * format_size;
+ }
+
+ if (stream->ctx) {
+ ret = oa_get_render_ctx_id(stream);
+ if (ret)
+ return ret;
+ }
+
+ ret = alloc_oa_buffer(dev_priv);
+ if (ret)
+ goto err_oa_buf_alloc;
+
+ /* PRM - observability performance counters:
+ *
+ * OACONTROL, performance counter enable, note:
+ *
+ * "When this bit is set, in order to have coherent counts,
+ * RC6 power state and trunk clock gating must be disabled.
+ * This can be achieved by programming MMIO registers as
+ * 0xA094=0 and 0xA090[31]=1"
+ *
+ * In our case we are expecting that taking pm + FORCEWAKE
+ * references will effectively disable RC6.
+ */
+ intel_runtime_pm_get(dev_priv);
+ intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
+
+ ret = dev_priv->perf.oa.ops.enable_metric_set(dev_priv);
+ if (ret)
+ goto err_enable;
+
+ stream->ops = &i915_oa_stream_ops;
+
+ dev_priv->perf.oa.exclusive_stream = stream;
+
+ return 0;
+
+err_enable:
+ intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+ intel_runtime_pm_put(dev_priv);
+ free_oa_buffer(dev_priv);
+
+err_oa_buf_alloc:
+ if (stream->ctx)
+ oa_put_render_ctx_id(stream);
+
+ return ret;
+}
+
static ssize_t i915_perf_read_locked(struct i915_perf_stream *stream,
struct file *file,
char __user *buf,
@@ -78,8 +961,20 @@ static ssize_t i915_perf_read(struct file *file,
struct drm_i915_private *dev_priv = stream->dev_priv;
ssize_t ret;
+ /* To ensure it's handled consistently we simply treat all reads of a
+ * disabled stream as an error. In particular it might otherwise lead
+ * to a deadlock for blocking file descriptors...
+ */
+ if (!stream->enabled)
+ return -EIO;
+
if (!(file->f_flags & O_NONBLOCK)) {
- /* Allow false positives from stream->ops->wait_unlocked.
+ /* There's the small chance of false positives from
+ * stream->ops->wait_unlocked.
+ *
+ * E.g. with single context filtering since we only wait until
+ * oabuffer has >= 1 report we don't immediately know whether
+ * any reports really belong to the current context
*/
do {
ret = stream->ops->wait_unlocked(stream);
@@ -97,21 +992,51 @@ static ssize_t i915_perf_read(struct file *file,
mutex_unlock(&dev_priv->perf.lock);
}
+ if (ret >= 0) {
+ /* Maybe make ->pollin per-stream state if we support multiple
+ * concurrent streams in the future.
+ */
+ dev_priv->perf.oa.pollin = false;
+ }
+
return ret;
}
-static unsigned int i915_perf_poll_locked(struct i915_perf_stream *stream,
+static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer)
+{
+ struct drm_i915_private *dev_priv =
+ container_of(hrtimer, typeof(*dev_priv),
+ perf.oa.poll_check_timer);
+
+ if (!dev_priv->perf.oa.ops.oa_buffer_is_empty(dev_priv)) {
+ dev_priv->perf.oa.pollin = true;
+ wake_up(&dev_priv->perf.oa.poll_wq);
+ }
+
+ hrtimer_forward_now(hrtimer, ns_to_ktime(POLL_PERIOD));
+
+ return HRTIMER_RESTART;
+}
+
+static unsigned int i915_perf_poll_locked(struct drm_i915_private *dev_priv,
+ struct i915_perf_stream *stream,
struct file *file,
poll_table *wait)
{
- unsigned int streams = 0;
+ unsigned int events = 0;
stream->ops->poll_wait(stream, file, wait);
- if (stream->ops->can_read(stream))
- streams |= POLLIN;
+ /* Note: we don't explicitly check whether there's something to read
+ * here since this path may be very hot depending on what else
+ * userspace is polling, or on the timeout in use. We rely solely on
+ * the hrtimer/oa_poll_check_timer_cb to notify us when there are
+ * samples to read.
+ */
+ if (dev_priv->perf.oa.pollin)
+ events |= POLLIN;
- return streams;
+ return events;
}
static unsigned int i915_perf_poll(struct file *file, poll_table *wait)
@@ -121,7 +1046,7 @@ static unsigned int i915_perf_poll(struct file *file, poll_table *wait)
int ret;
mutex_lock(&dev_priv->perf.lock);
- ret = i915_perf_poll_locked(stream, file, wait);
+ ret = i915_perf_poll_locked(dev_priv, stream, file, wait);
mutex_unlock(&dev_priv->perf.lock);
return ret;
@@ -285,18 +1210,21 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
goto err_ctx;
}
- stream->sample_flags = props->sample_flags;
stream->dev_priv = dev_priv;
stream->ctx = specific_ctx;
- /*
- * TODO: support sampling something
- *
- * For now this is as far as we can go.
+ ret = i915_oa_stream_init(stream, param, props);
+ if (ret)
+ goto err_alloc;
+
+ /* we avoid simply assigning stream->sample_flags = props->sample_flags
+ * to have _stream_init check the combination of sample flags more
+ * thoroughly, but still this is the expected result at this point.
*/
- DRM_ERROR("Unsupported i915 perf stream configuration\n");
- ret = -EINVAL;
- goto err_alloc;
+ if (WARN_ON(stream->sample_flags != props->sample_flags)) {
+ ret = -ENODEV;
+ goto err_alloc;
+ }
list_add(&stream->link, &dev_priv->perf.streams);
@@ -382,6 +1310,56 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
props->single_context = 1;
props->ctx_handle = value;
break;
+ case DRM_I915_PERF_PROP_SAMPLE_OA:
+ props->sample_flags |= SAMPLE_OA_REPORT;
+ break;
+ case DRM_I915_PERF_PROP_OA_METRICS_SET:
+ if (value == 0 ||
+ value > dev_priv->perf.oa.n_builtin_sets) {
+ DRM_ERROR("Unknown OA metric set ID");
+ return -EINVAL;
+ }
+ props->metrics_set = value;
+ break;
+ case DRM_I915_PERF_PROP_OA_FORMAT:
+ if (value == 0 || value >= I915_OA_FORMAT_MAX) {
+ DRM_ERROR("Invalid OA report format\n");
+ return -EINVAL;
+ }
+ if (!dev_priv->perf.oa.oa_formats[value].size) {
+ DRM_ERROR("Invalid OA report format\n");
+ return -EINVAL;
+ }
+ props->oa_format = value;
+ break;
+ case DRM_I915_PERF_PROP_OA_EXPONENT:
+ if (value > OA_EXPONENT_MAX) {
+ DRM_ERROR("OA timer exponent too high (> %u)\n",
+ OA_EXPONENT_MAX);
+ return -EINVAL;
+ }
+
+ /* NB: The exponent represents a period as follows:
+ *
+ * 80ns * 2^(period_exponent + 1)
+ *
+ * Theoretically we can program the OA unit to sample
+ * every 160ns but don't allow that by default unless
+ * root.
+ *
+ * Referring to perf's
+ * kernel.perf_event_max_sample_rate for a precedent
+ * (100000 by default); with an OA exponent of 6 we get
+ * a period of 10.240 microseconds -just under 100000Hz
+ */
+ if (value < 6 && !capable(CAP_SYS_ADMIN)) {
+ DRM_ERROR("Minimum OA sampling exponent is 6 without root privileges\n");
+ return -EACCES;
+ }
+
+ props->oa_periodic = true;
+ props->oa_period_exponent = value;
+ break;
default:
MISSING_CASE(id);
DRM_ERROR("Unknown i915 perf property ID");
@@ -432,8 +1410,33 @@ int i915_perf_open_ioctl(struct drm_device *dev, void *data,
void i915_perf_init(struct drm_i915_private *dev_priv)
{
+ if (!IS_HASWELL(dev_priv))
+ return;
+
+ hrtimer_init(&dev_priv->perf.oa.poll_check_timer,
+ CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ dev_priv->perf.oa.poll_check_timer.function = oa_poll_check_timer_cb;
+ init_waitqueue_head(&dev_priv->perf.oa.poll_wq);
+
INIT_LIST_HEAD(&dev_priv->perf.streams);
mutex_init(&dev_priv->perf.lock);
+ spin_lock_init(&dev_priv->perf.hook_lock);
+
+ dev_priv->perf.oa.ops.init_oa_buffer = gen7_init_oa_buffer;
+ dev_priv->perf.oa.ops.enable_metric_set = hsw_enable_metric_set;
+ dev_priv->perf.oa.ops.disable_metric_set = hsw_disable_metric_set;
+ dev_priv->perf.oa.ops.oa_enable = gen7_oa_enable;
+ dev_priv->perf.oa.ops.oa_disable = gen7_oa_disable;
+ dev_priv->perf.oa.ops.read = gen7_oa_read;
+ dev_priv->perf.oa.ops.oa_buffer_is_empty =
+ gen7_oa_buffer_is_empty_fop_unlocked;
+
+ dev_priv->perf.oa.timestamp_frequency = 12500000;
+
+ dev_priv->perf.oa.oa_formats = hsw_oa_formats;
+
+ dev_priv->perf.oa.n_builtin_sets =
+ i915_oa_n_builtin_metric_sets_hsw;
dev_priv->perf.initialized = true;
}
@@ -443,7 +1446,6 @@ void i915_perf_fini(struct drm_i915_private *dev_priv)
if (!dev_priv->perf.initialized)
return;
- /* Currently nothing to clean up */
-
+ memset(&dev_priv->perf.oa.ops, 0, sizeof(dev_priv->perf.oa.ops));
dev_priv->perf.initialized = false;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index ee8707343ae4..fcad8fa41274 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -616,6 +616,343 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define HSW_CS_GPR_UDW(n) _MMIO(0x2600 + (n) * 8 + 4)
#define GEN7_OACONTROL _MMIO(0x2360)
+#define GEN7_OACONTROL_CTX_MASK 0xFFFFF000
+#define GEN7_OACONTROL_TIMER_PERIOD_MASK 0x3F
+#define GEN7_OACONTROL_TIMER_PERIOD_SHIFT 6
+#define GEN7_OACONTROL_TIMER_ENABLE (1<<5)
+#define GEN7_OACONTROL_FORMAT_A13 (0<<2)
+#define GEN7_OACONTROL_FORMAT_A29 (1<<2)
+#define GEN7_OACONTROL_FORMAT_A13_B8_C8 (2<<2)
+#define GEN7_OACONTROL_FORMAT_A29_B8_C8 (3<<2)
+#define GEN7_OACONTROL_FORMAT_B4_C8 (4<<2)
+#define GEN7_OACONTROL_FORMAT_A45_B8_C8 (5<<2)
+#define GEN7_OACONTROL_FORMAT_B4_C8_A16 (6<<2)
+#define GEN7_OACONTROL_FORMAT_C4_B8 (7<<2)
+#define GEN7_OACONTROL_FORMAT_SHIFT 2
+#define GEN7_OACONTROL_PER_CTX_ENABLE (1<<1)
+#define GEN7_OACONTROL_ENABLE (1<<0)
+
+#define GEN8_OACTXID _MMIO(0x2364)
+
+#define GEN8_OACONTROL _MMIO(0x2B00)
+#define GEN8_OA_REPORT_FORMAT_A12 (0<<2)
+#define GEN8_OA_REPORT_FORMAT_A12_B8_C8 (2<<2)
+#define GEN8_OA_REPORT_FORMAT_A36_B8_C8 (5<<2)
+#define GEN8_OA_REPORT_FORMAT_C4_B8 (7<<2)
+#define GEN8_OA_REPORT_FORMAT_SHIFT 2
+#define GEN8_OA_SPECIFIC_CONTEXT_ENABLE (1<<1)
+#define GEN8_OA_COUNTER_ENABLE (1<<0)
+
+#define GEN8_OACTXCONTROL _MMIO(0x2360)
+#define GEN8_OA_TIMER_PERIOD_MASK 0x3F
+#define GEN8_OA_TIMER_PERIOD_SHIFT 2
+#define GEN8_OA_TIMER_ENABLE (1<<1)
+#define GEN8_OA_COUNTER_RESUME (1<<0)
+
+#define GEN7_OABUFFER _MMIO(0x23B0) /* R/W */
+#define GEN7_OABUFFER_OVERRUN_DISABLE (1<<3)
+#define GEN7_OABUFFER_EDGE_TRIGGER (1<<2)
+#define GEN7_OABUFFER_STOP_RESUME_ENABLE (1<<1)
+#define GEN7_OABUFFER_RESUME (1<<0)
+
+#define GEN8_OABUFFER _MMIO(0x2b14)
+
+#define GEN7_OASTATUS1 _MMIO(0x2364)
+#define GEN7_OASTATUS1_TAIL_MASK 0xffffffc0
+#define GEN7_OASTATUS1_COUNTER_OVERFLOW (1<<2)
+#define GEN7_OASTATUS1_OABUFFER_OVERFLOW (1<<1)
+#define GEN7_OASTATUS1_REPORT_LOST (1<<0)
+
+#define GEN7_OASTATUS2 _MMIO(0x2368)
+#define GEN7_OASTATUS2_HEAD_MASK 0xffffffc0
+
+#define GEN8_OASTATUS _MMIO(0x2b08)
+#define GEN8_OASTATUS_OVERRUN_STATUS (1<<3)
+#define GEN8_OASTATUS_COUNTER_OVERFLOW (1<<2)
+#define GEN8_OASTATUS_OABUFFER_OVERFLOW (1<<1)
+#define GEN8_OASTATUS_REPORT_LOST (1<<0)
+
+#define GEN8_OAHEADPTR _MMIO(0x2B0C)
+#define GEN8_OATAILPTR _MMIO(0x2B10)
+
+#define OABUFFER_SIZE_128K (0<<3)
+#define OABUFFER_SIZE_256K (1<<3)
+#define OABUFFER_SIZE_512K (2<<3)
+#define OABUFFER_SIZE_1M (3<<3)
+#define OABUFFER_SIZE_2M (4<<3)
+#define OABUFFER_SIZE_4M (5<<3)
+#define OABUFFER_SIZE_8M (6<<3)
+#define OABUFFER_SIZE_16M (7<<3)
+
+#define OA_MEM_SELECT_GGTT (1<<0)
+
+#define EU_PERF_CNTL0 _MMIO(0xe458)
+
+#define GDT_CHICKEN_BITS _MMIO(0x9840)
+#define GT_NOA_ENABLE 0x00000080
+
+/*
+ * OA Boolean state
+ */
+
+#define OAREPORTTRIG1 _MMIO(0x2740)
+#define OAREPORTTRIG1_THRESHOLD_MASK 0xffff
+#define OAREPORTTRIG1_EDGE_LEVEL_TRIGER_SELECT_MASK 0xffff0000 /* 0=level */
+
+#define OAREPORTTRIG2 _MMIO(0x2744)
+#define OAREPORTTRIG2_INVERT_A_0 (1<<0)
+#define OAREPORTTRIG2_INVERT_A_1 (1<<1)
+#define OAREPORTTRIG2_INVERT_A_2 (1<<2)
+#define OAREPORTTRIG2_INVERT_A_3 (1<<3)
+#define OAREPORTTRIG2_INVERT_A_4 (1<<4)
+#define OAREPORTTRIG2_INVERT_A_5 (1<<5)
+#define OAREPORTTRIG2_INVERT_A_6 (1<<6)
+#define OAREPORTTRIG2_INVERT_A_7 (1<<7)
+#define OAREPORTTRIG2_INVERT_A_8 (1<<8)
+#define OAREPORTTRIG2_INVERT_A_9 (1<<9)
+#define OAREPORTTRIG2_INVERT_A_10 (1<<10)
+#define OAREPORTTRIG2_INVERT_A_11 (1<<11)
+#define OAREPORTTRIG2_INVERT_A_12 (1<<12)
+#define OAREPORTTRIG2_INVERT_A_13 (1<<13)
+#define OAREPORTTRIG2_INVERT_A_14 (1<<14)
+#define OAREPORTTRIG2_INVERT_A_15 (1<<15)
+#define OAREPORTTRIG2_INVERT_B_0 (1<<16)
+#define OAREPORTTRIG2_INVERT_B_1 (1<<17)
+#define OAREPORTTRIG2_INVERT_B_2 (1<<18)
+#define OAREPORTTRIG2_INVERT_B_3 (1<<19)
+#define OAREPORTTRIG2_INVERT_C_0 (1<<20)
+#define OAREPORTTRIG2_INVERT_C_1 (1<<21)
+#define OAREPORTTRIG2_INVERT_D_0 (1<<22)
+#define OAREPORTTRIG2_THRESHOLD_ENABLE (1<<23)
+#define OAREPORTTRIG2_REPORT_TRIGGER_ENABLE (1<<31)
+
+#define OAREPORTTRIG3 _MMIO(0x2748)
+#define OAREPORTTRIG3_NOA_SELECT_MASK 0xf
+#define OAREPORTTRIG3_NOA_SELECT_8_SHIFT 0
+#define OAREPORTTRIG3_NOA_SELECT_9_SHIFT 4
+#define OAREPORTTRIG3_NOA_SELECT_10_SHIFT 8
+#define OAREPORTTRIG3_NOA_SELECT_11_SHIFT 12
+#define OAREPORTTRIG3_NOA_SELECT_12_SHIFT 16
+#define OAREPORTTRIG3_NOA_SELECT_13_SHIFT 20
+#define OAREPORTTRIG3_NOA_SELECT_14_SHIFT 24
+#define OAREPORTTRIG3_NOA_SELECT_15_SHIFT 28
+
+#define OAREPORTTRIG4 _MMIO(0x274c)
+#define OAREPORTTRIG4_NOA_SELECT_MASK 0xf
+#define OAREPORTTRIG4_NOA_SELECT_0_SHIFT 0
+#define OAREPORTTRIG4_NOA_SELECT_1_SHIFT 4
+#define OAREPORTTRIG4_NOA_SELECT_2_SHIFT 8
+#define OAREPORTTRIG4_NOA_SELECT_3_SHIFT 12
+#define OAREPORTTRIG4_NOA_SELECT_4_SHIFT 16
+#define OAREPORTTRIG4_NOA_SELECT_5_SHIFT 20
+#define OAREPORTTRIG4_NOA_SELECT_6_SHIFT 24
+#define OAREPORTTRIG4_NOA_SELECT_7_SHIFT 28
+
+#define OAREPORTTRIG5 _MMIO(0x2750)
+#define OAREPORTTRIG5_THRESHOLD_MASK 0xffff
+#define OAREPORTTRIG5_EDGE_LEVEL_TRIGER_SELECT_MASK 0xffff0000 /* 0=level */
+
+#define OAREPORTTRIG6 _MMIO(0x2754)
+#define OAREPORTTRIG6_INVERT_A_0 (1<<0)
+#define OAREPORTTRIG6_INVERT_A_1 (1<<1)
+#define OAREPORTTRIG6_INVERT_A_2 (1<<2)
+#define OAREPORTTRIG6_INVERT_A_3 (1<<3)
+#define OAREPORTTRIG6_INVERT_A_4 (1<<4)
+#define OAREPORTTRIG6_INVERT_A_5 (1<<5)
+#define OAREPORTTRIG6_INVERT_A_6 (1<<6)
+#define OAREPORTTRIG6_INVERT_A_7 (1<<7)
+#define OAREPORTTRIG6_INVERT_A_8 (1<<8)
+#define OAREPORTTRIG6_INVERT_A_9 (1<<9)
+#define OAREPORTTRIG6_INVERT_A_10 (1<<10)
+#define OAREPORTTRIG6_INVERT_A_11 (1<<11)
+#define OAREPORTTRIG6_INVERT_A_12 (1<<12)
+#define OAREPORTTRIG6_INVERT_A_13 (1<<13)
+#define OAREPORTTRIG6_INVERT_A_14 (1<<14)
+#define OAREPORTTRIG6_INVERT_A_15 (1<<15)
+#define OAREPORTTRIG6_INVERT_B_0 (1<<16)
+#define OAREPORTTRIG6_INVERT_B_1 (1<<17)
+#define OAREPORTTRIG6_INVERT_B_2 (1<<18)
+#define OAREPORTTRIG6_INVERT_B_3 (1<<19)
+#define OAREPORTTRIG6_INVERT_C_0 (1<<20)
+#define OAREPORTTRIG6_INVERT_C_1 (1<<21)
+#define OAREPORTTRIG6_INVERT_D_0 (1<<22)
+#define OAREPORTTRIG6_THRESHOLD_ENABLE (1<<23)
+#define OAREPORTTRIG6_REPORT_TRIGGER_ENABLE (1<<31)
+
+#define OAREPORTTRIG7 _MMIO(0x2758)
+#define OAREPORTTRIG7_NOA_SELECT_MASK 0xf
+#define OAREPORTTRIG7_NOA_SELECT_8_SHIFT 0
+#define OAREPORTTRIG7_NOA_SELECT_9_SHIFT 4
+#define OAREPORTTRIG7_NOA_SELECT_10_SHIFT 8
+#define OAREPORTTRIG7_NOA_SELECT_11_SHIFT 12
+#define OAREPORTTRIG7_NOA_SELECT_12_SHIFT 16
+#define OAREPORTTRIG7_NOA_SELECT_13_SHIFT 20
+#define OAREPORTTRIG7_NOA_SELECT_14_SHIFT 24
+#define OAREPORTTRIG7_NOA_SELECT_15_SHIFT 28
+
+#define OAREPORTTRIG8 _MMIO(0x275c)
+#define OAREPORTTRIG8_NOA_SELECT_MASK 0xf
+#define OAREPORTTRIG8_NOA_SELECT_0_SHIFT 0
+#define OAREPORTTRIG8_NOA_SELECT_1_SHIFT 4
+#define OAREPORTTRIG8_NOA_SELECT_2_SHIFT 8
+#define OAREPORTTRIG8_NOA_SELECT_3_SHIFT 12
+#define OAREPORTTRIG8_NOA_SELECT_4_SHIFT 16
+#define OAREPORTTRIG8_NOA_SELECT_5_SHIFT 20
+#define OAREPORTTRIG8_NOA_SELECT_6_SHIFT 24
+#define OAREPORTTRIG8_NOA_SELECT_7_SHIFT 28
+
+#define OASTARTTRIG1 _MMIO(0x2710)
+#define OASTARTTRIG1_THRESHOLD_COUNT_MASK_MBZ 0xffff0000
+#define OASTARTTRIG1_THRESHOLD_MASK 0xffff
+
+#define OASTARTTRIG2 _MMIO(0x2714)
+#define OASTARTTRIG2_INVERT_A_0 (1<<0)
+#define OASTARTTRIG2_INVERT_A_1 (1<<1)
+#define OASTARTTRIG2_INVERT_A_2 (1<<2)
+#define OASTARTTRIG2_INVERT_A_3 (1<<3)
+#define OASTARTTRIG2_INVERT_A_4 (1<<4)
+#define OASTARTTRIG2_INVERT_A_5 (1<<5)
+#define OASTARTTRIG2_INVERT_A_6 (1<<6)
+#define OASTARTTRIG2_INVERT_A_7 (1<<7)
+#define OASTARTTRIG2_INVERT_A_8 (1<<8)
+#define OASTARTTRIG2_INVERT_A_9 (1<<9)
+#define OASTARTTRIG2_INVERT_A_10 (1<<10)
+#define OASTARTTRIG2_INVERT_A_11 (1<<11)
+#define OASTARTTRIG2_INVERT_A_12 (1<<12)
+#define OASTARTTRIG2_INVERT_A_13 (1<<13)
+#define OASTARTTRIG2_INVERT_A_14 (1<<14)
+#define OASTARTTRIG2_INVERT_A_15 (1<<15)
+#define OASTARTTRIG2_INVERT_B_0 (1<<16)
+#define OASTARTTRIG2_INVERT_B_1 (1<<17)
+#define OASTARTTRIG2_INVERT_B_2 (1<<18)
+#define OASTARTTRIG2_INVERT_B_3 (1<<19)
+#define OASTARTTRIG2_INVERT_C_0 (1<<20)
+#define OASTARTTRIG2_INVERT_C_1 (1<<21)
+#define OASTARTTRIG2_INVERT_D_0 (1<<22)
+#define OASTARTTRIG2_THRESHOLD_ENABLE (1<<23)
+#define OASTARTTRIG2_START_TRIG_FLAG_MBZ (1<<24)
+#define OASTARTTRIG2_EVENT_SELECT_0 (1<<28)
+#define OASTARTTRIG2_EVENT_SELECT_1 (1<<29)
+#define OASTARTTRIG2_EVENT_SELECT_2 (1<<30)
+#define OASTARTTRIG2_EVENT_SELECT_3 (1<<31)
+
+#define OASTARTTRIG3 _MMIO(0x2718)
+#define OASTARTTRIG3_NOA_SELECT_MASK 0xf
+#define OASTARTTRIG3_NOA_SELECT_8_SHIFT 0
+#define OASTARTTRIG3_NOA_SELECT_9_SHIFT 4
+#define OASTARTTRIG3_NOA_SELECT_10_SHIFT 8
+#define OASTARTTRIG3_NOA_SELECT_11_SHIFT 12
+#define OASTARTTRIG3_NOA_SELECT_12_SHIFT 16
+#define OASTARTTRIG3_NOA_SELECT_13_SHIFT 20
+#define OASTARTTRIG3_NOA_SELECT_14_SHIFT 24
+#define OASTARTTRIG3_NOA_SELECT_15_SHIFT 28
+
+#define OASTARTTRIG4 _MMIO(0x271c)
+#define OASTARTTRIG4_NOA_SELECT_MASK 0xf
+#define OASTARTTRIG4_NOA_SELECT_0_SHIFT 0
+#define OASTARTTRIG4_NOA_SELECT_1_SHIFT 4
+#define OASTARTTRIG4_NOA_SELECT_2_SHIFT 8
+#define OASTARTTRIG4_NOA_SELECT_3_SHIFT 12
+#define OASTARTTRIG4_NOA_SELECT_4_SHIFT 16
+#define OASTARTTRIG4_NOA_SELECT_5_SHIFT 20
+#define OASTARTTRIG4_NOA_SELECT_6_SHIFT 24
+#define OASTARTTRIG4_NOA_SELECT_7_SHIFT 28
+
+#define OASTARTTRIG5 _MMIO(0x2720)
+#define OASTARTTRIG5_THRESHOLD_COUNT_MASK_MBZ 0xffff0000
+#define OASTARTTRIG5_THRESHOLD_MASK 0xffff
+
+#define OASTARTTRIG6 _MMIO(0x2724)
+#define OASTARTTRIG6_INVERT_A_0 (1<<0)
+#define OASTARTTRIG6_INVERT_A_1 (1<<1)
+#define OASTARTTRIG6_INVERT_A_2 (1<<2)
+#define OASTARTTRIG6_INVERT_A_3 (1<<3)
+#define OASTARTTRIG6_INVERT_A_4 (1<<4)
+#define OASTARTTRIG6_INVERT_A_5 (1<<5)
+#define OASTARTTRIG6_INVERT_A_6 (1<<6)
+#define OASTARTTRIG6_INVERT_A_7 (1<<7)
+#define OASTARTTRIG6_INVERT_A_8 (1<<8)
+#define OASTARTTRIG6_INVERT_A_9 (1<<9)
+#define OASTARTTRIG6_INVERT_A_10 (1<<10)
+#define OASTARTTRIG6_INVERT_A_11 (1<<11)
+#define OASTARTTRIG6_INVERT_A_12 (1<<12)
+#define OASTARTTRIG6_INVERT_A_13 (1<<13)
+#define OASTARTTRIG6_INVERT_A_14 (1<<14)
+#define OASTARTTRIG6_INVERT_A_15 (1<<15)
+#define OASTARTTRIG6_INVERT_B_0 (1<<16)
+#define OASTARTTRIG6_INVERT_B_1 (1<<17)
+#define OASTARTTRIG6_INVERT_B_2 (1<<18)
+#define OASTARTTRIG6_INVERT_B_3 (1<<19)
+#define OASTARTTRIG6_INVERT_C_0 (1<<20)
+#define OASTARTTRIG6_INVERT_C_1 (1<<21)
+#define OASTARTTRIG6_INVERT_D_0 (1<<22)
+#define OASTARTTRIG6_THRESHOLD_ENABLE (1<<23)
+#define OASTARTTRIG6_START_TRIG_FLAG_MBZ (1<<24)
+#define OASTARTTRIG6_EVENT_SELECT_4 (1<<28)
+#define OASTARTTRIG6_EVENT_SELECT_5 (1<<29)
+#define OASTARTTRIG6_EVENT_SELECT_6 (1<<30)
+#define OASTARTTRIG6_EVENT_SELECT_7 (1<<31)
+
+#define OASTARTTRIG7 _MMIO(0x2728)
+#define OASTARTTRIG7_NOA_SELECT_MASK 0xf
+#define OASTARTTRIG7_NOA_SELECT_8_SHIFT 0
+#define OASTARTTRIG7_NOA_SELECT_9_SHIFT 4
+#define OASTARTTRIG7_NOA_SELECT_10_SHIFT 8
+#define OASTARTTRIG7_NOA_SELECT_11_SHIFT 12
+#define OASTARTTRIG7_NOA_SELECT_12_SHIFT 16
+#define OASTARTTRIG7_NOA_SELECT_13_SHIFT 20
+#define OASTARTTRIG7_NOA_SELECT_14_SHIFT 24
+#define OASTARTTRIG7_NOA_SELECT_15_SHIFT 28
+
+#define OASTARTTRIG8 _MMIO(0x272c)
+#define OASTARTTRIG8_NOA_SELECT_MASK 0xf
+#define OASTARTTRIG8_NOA_SELECT_0_SHIFT 0
+#define OASTARTTRIG8_NOA_SELECT_1_SHIFT 4
+#define OASTARTTRIG8_NOA_SELECT_2_SHIFT 8
+#define OASTARTTRIG8_NOA_SELECT_3_SHIFT 12
+#define OASTARTTRIG8_NOA_SELECT_4_SHIFT 16
+#define OASTARTTRIG8_NOA_SELECT_5_SHIFT 20
+#define OASTARTTRIG8_NOA_SELECT_6_SHIFT 24
+#define OASTARTTRIG8_NOA_SELECT_7_SHIFT 28
+
+/* CECX_0 */
+#define OACEC_COMPARE_LESS_OR_EQUAL 6
+#define OACEC_COMPARE_NOT_EQUAL 5
+#define OACEC_COMPARE_LESS_THAN 4
+#define OACEC_COMPARE_GREATER_OR_EQUAL 3
+#define OACEC_COMPARE_EQUAL 2
+#define OACEC_COMPARE_GREATER_THAN 1
+#define OACEC_COMPARE_ANY_EQUAL 0
+
+#define OACEC_COMPARE_VALUE_MASK 0xffff
+#define OACEC_COMPARE_VALUE_SHIFT 3
+
+#define OACEC_SELECT_NOA (0<<19)
+#define OACEC_SELECT_PREV (1<<19)
+#define OACEC_SELECT_BOOLEAN (2<<19)
+
+/* CECX_1 */
+#define OACEC_MASK_MASK 0xffff
+#define OACEC_CONSIDERATIONS_MASK 0xffff
+#define OACEC_CONSIDERATIONS_SHIFT 16
+
+#define OACEC0_0 _MMIO(0x2770)
+#define OACEC0_1 _MMIO(0x2774)
+#define OACEC1_0 _MMIO(0x2778)
+#define OACEC1_1 _MMIO(0x277c)
+#define OACEC2_0 _MMIO(0x2780)
+#define OACEC2_1 _MMIO(0x2784)
+#define OACEC3_0 _MMIO(0x2788)
+#define OACEC3_1 _MMIO(0x278c)
+#define OACEC4_0 _MMIO(0x2790)
+#define OACEC4_1 _MMIO(0x2794)
+#define OACEC5_0 _MMIO(0x2798)
+#define OACEC5_1 _MMIO(0x279c)
+#define OACEC6_0 _MMIO(0x27a0)
+#define OACEC6_1 _MMIO(0x27a4)
+#define OACEC7_0 _MMIO(0x27a8)
+#define OACEC7_1 _MMIO(0x27ac)
+
#define _GEN7_PIPEA_DE_LOAD_SL 0x70068
#define _GEN7_PIPEB_DE_LOAD_SL 0x71068
@@ -6914,6 +7251,7 @@ enum {
# define GEN6_RCCUNIT_CLOCK_GATE_DISABLE (1 << 11)
#define GEN6_UCGCTL3 _MMIO(0x9408)
+# define GEN6_OACSUNIT_CLOCK_GATE_DISABLE (1 << 20)
#define GEN7_UCGCTL4 _MMIO(0x940c)
#define GEN7_L3BANK2X_CLOCK_GATE_DISABLE (1<<25)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 192dc1f8256b..bdfc68876990 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1230,6 +1230,18 @@ struct drm_i915_gem_context_param {
__u64 value;
};
+enum drm_i915_oa_format {
+ I915_OA_FORMAT_A13 = 1,
+ I915_OA_FORMAT_A29,
+ I915_OA_FORMAT_A13_B8_C8,
+ I915_OA_FORMAT_B4_C8,
+ I915_OA_FORMAT_A45_B8_C8,
+ I915_OA_FORMAT_B4_C8_A16,
+ I915_OA_FORMAT_C4_B8,
+
+ I915_OA_FORMAT_MAX /* non-ABI */
+};
+
enum drm_i915_perf_property_id {
/**
* Open the stream for a specific context handle (as used with
@@ -1238,6 +1250,32 @@ enum drm_i915_perf_property_id {
*/
DRM_I915_PERF_PROP_CTX_HANDLE = 1,
+ /**
+ * A value of 1 requests the inclusion of raw OA unit reports as
+ * part of stream samples.
+ */
+ DRM_I915_PERF_PROP_SAMPLE_OA,
+
+ /**
+ * The value specifies which set of OA unit metrics should be
+ * be configured, defining the contents of any OA unit reports.
+ */
+ DRM_I915_PERF_PROP_OA_METRICS_SET,
+
+ /**
+ * The value specifies the size and layout of OA unit reports.
+ */
+ DRM_I915_PERF_PROP_OA_FORMAT,
+
+ /**
+ * Specifying this property implicitly requests periodic OA unit
+ * sampling and (at least on Haswell) the sampling frequency is derived
+ * from this exponent as follows:
+ *
+ * 80ns * 2^(period_exponent + 1)
+ */
+ DRM_I915_PERF_PROP_OA_EXPONENT,
+
DRM_I915_PERF_PROP_MAX /* non-ABI */
};
@@ -1257,7 +1295,23 @@ struct drm_i915_perf_open_param {
__u64 __user properties_ptr;
};
+/**
+ * Enable data capture for a stream that was either opened in a disabled state
+ * via I915_PERF_FLAG_DISABLED or was later disabled via
+ * I915_PERF_IOCTL_DISABLE.
+ *
+ * It is intended to be cheaper to disable and enable a stream than it may be
+ * to close and re-open a stream with the same configuration.
+ *
+ * It's undefined whether any pending data for the stream will be lost.
+ */
#define I915_PERF_IOCTL_ENABLE _IO('i', 0x0)
+
+/**
+ * Disable data capture for a stream.
+ *
+ * It is an error to try and read a stream that is disabled.
+ */
#define I915_PERF_IOCTL_DISABLE _IO('i', 0x1)
/**
@@ -1281,17 +1335,30 @@ enum drm_i915_perf_record_type {
* every sample.
*
* The order of these sample properties given by userspace has no
- * affect on the ordering of data within a sample. The order will be
+ * affect on the ordering of data within a sample. The order is
* documented here.
*
* struct {
* struct drm_i915_perf_record_header header;
*
- * TODO: itemize extensible sample data here
+ * { u32 oa_report[]; } && DRM_I915_PERF_PROP_SAMPLE_OA
* };
*/
DRM_I915_PERF_RECORD_SAMPLE = 1,
+ /*
+ * Indicates that one or more OA reports were not written by the
+ * hardware. This can happen for example if an MI_REPORT_PERF_COUNT
+ * command collides with periodic sampling - which would be more likely
+ * at higher sampling frequencies.
+ */
+ DRM_I915_PERF_RECORD_OA_REPORT_LOST = 2,
+
+ /**
+ * An error occurred that resulted in all pending OA reports being lost.
+ */
+ DRM_I915_PERF_RECORD_OA_BUFFER_LOST = 3,
+
DRM_I915_PERF_RECORD_MAX /* non-ABI */
};