On 25 October 2016 at 00:19, Robert Bragg <robert@xxxxxxxxxxxxx> wrote:
> 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.
>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Robert Bragg <robert@xxxxxxxxxxxxx>
> Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>
>
> fix enable hsw
Random bit of cruft ?
> ---
> drivers/gpu/drm/i915/i915_drv.h | 65 ++-
> drivers/gpu/drm/i915/i915_perf.c | 1000 +++++++++++++++++++++++++++++++++++++-
> drivers/gpu/drm/i915/i915_reg.h | 338 +++++++++++++
> include/uapi/drm/i915_drm.h | 70 ++-
> 4 files changed, 1444 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 3448d05..ea24814 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1764,6 +1764,11 @@ 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;
> @@ -1784,11 +1789,6 @@ 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
> */
> @@ -1798,9 +1798,7 @@ 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);
>
> @@ -1840,11 +1838,28 @@ 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 {
> @@ -2149,16 +2164,46 @@ 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;
Can we just get rid of this, now that the vma remains pinned we can
simply get the ggtt address at the time of configuring the OA_CONTROL
register ?
> +
> + struct hrtimer poll_check_timer;
> + wait_queue_head_t poll_wq;
> + atomic_t 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 4d51586..d7a4899 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -25,16 +25,867 @@
> */
>
> #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
We shouldn't need this anymore.
> +
> +
> +/* 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.
> + * @head_ptr: (inout): the head pointer before and after appending
> + *
> + * 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.
> + */
This kernel doc could do with a spring clean.
> +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;
> +
> + BUG_ON(!stream->enabled);
> +
> + 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",
> + 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.
> + */
> + BUG_ON((OA_BUFFER_SIZE - head) < report_size);
> +
> + /* 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;
> +
> + BUG_ON(!dev_priv->perf.oa.oa_buffer.vaddr);
> +
> + 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");
> +
> + 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 indefinitly 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);
> +}
> +
> +static int claim_specific_ctx(struct i915_perf_stream *stream)
> +{
pin_oa_specific_ctx, or something? Also would it not make more sense
to operate on the context, not the 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;
> +
> + /* So that we don't have to worry about updating the context ID
> + * in OACONTOL on the fly we make sure to pin the context
> + * upfront for the lifetime of the stream...
> + */
> + vma = stream->ctx->engine[RCS].state;
> + ret = i915_vma_pin(vma, 0, stream->ctx->ggtt_alignment,
> + PIN_GLOBAL | PIN_HIGH);
> + if (ret)
> + return ret;
> +
> + dev_priv->perf.oa.specific_ctx_id = i915_ggtt_offset(vma);
> +
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> + return 0;
> +}
> +
> +static void release_specific_ctx(struct i915_perf_stream *stream)
Likewise here, unpin_oa_specific_ctx. Just a thought though so feel
free to ignore.
> +{
> + struct drm_i915_private *dev_priv = stream->dev_priv;
> +
> + mutex_lock(&dev_priv->drm.struct_mutex);
> +
> + i915_vma_unpin(stream->ctx->engine[RCS].state);
> + 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)
> + release_specific_ctx(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. */
> + atomic_set(&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;
> +
> + BUG_ON(dev_priv->perf.oa.oa_buffer.vma);
> +
> + 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, PIN_MAPPABLE);
> + 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",
> + 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;
> + BUG_ON(dev_priv->perf.oa.oa_buffer.format_size == 0);
> +
> + 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 = claim_specific_ctx(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)
> + release_specific_ctx(stream);
> +
> + return ret;
> +}
> +
> static ssize_t i915_perf_read_locked(struct i915_perf_stream *stream,
> struct file *file,
> char __user *buf,
> @@ -78,8 +929,20 @@ 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 +960,50 @@ 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. */
> + atomic_set(&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)) {
> + atomic_set(&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 (atomic_read(&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 +1013,7 @@ 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 +1177,18 @@ 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;
> + BUG_ON(stream->sample_flags != props->sample_flags);
>
> list_add(&stream->link, &dev_priv->perf.streams);
>
> @@ -376,6 +1268,56 @@ 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("Sampling period too high without root privileges\n");
Print the minimum sampling period here? Could be useful especially
when in a later patch we make this configurable.
> + return -EACCES;
> + }
> +
> + props->oa_periodic = true;
> + props->oa_period_exponent = value;
> + break;
> default:
> MISSING_CASE(id);
> DRM_ERROR("Unknown i915 perf property ID");
> @@ -426,8 +1368,33 @@ 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;
> }
> @@ -437,7 +1404,6 @@ 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 070d3297..2557b3f 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
> @@ -6982,6 +7319,7 @@ 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 98cd493..bf3b8e2 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1224,6 +1224,18 @@ 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
> @@ -1232,6 +1244,32 @@ 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 */
> };
>
> @@ -1251,7 +1289,22 @@ 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_DIABLED or was later disabled via I915_PERF_IOCTL_DISABLE.
I915_PERF_FLAG_DISABLED
> + *
> + * 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)
>
> /**
> @@ -1275,17 +1328,30 @@ 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 */
> };
>
> --
> 2.10.1
>
Otherwise looks good.
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