On Mon, Mar 27, 2017 at 7:12 PM, Matthew Auld <matthew.william.auld@xxxxxxxxx> wrote:
No longer needed.On 03/23, Robert Bragg wrote:
> Enables access to OA unit metrics for BDW, CHV, SKL and BXT which all
> share (more-or-less) the same OA unit design.
>
> Of particular note in comparison to Haswell: some OA unit HW config
> state has become per-context state and as a consequence it is somewhat
> more complicated to manage synchronous state changes from the cpu while
> there's no guarantee of what context (if any) is currently actively
> running on the gpu.
>
> The periodic sampling frequency which can be particularly useful for
> system-wide analysis (as opposed to command stream synchronised
> MI_REPORT_PERF_COUNT commands) is perhaps the most surprising state to
> have become per-context save and restored (while the OABUFFER
> destination is still a shared, system-wide resource).
>
> This support for gen8+ takes care to consider a number of timing
> challenges involved in synchronously updating per-context state
> primarily by programming all config state from the cpu and updating all
> current and saved contexts synchronously while the OA unit is still
> disabled.
>
> The driver intentionally avoids depending on command streamer
> programming to update OA state considering the lack of synchronization
> between the automatic loading of OACTXCONTROL state (that includes the
> periodic sampling state and enable state) on context restore and the
> parsing of any general purpose BB the driver can control. I.e. this
> implementation is careful to avoid the possibility of a context restore
> temporarily enabling any out-of-date periodic sampling state. In
> addition to the risk of transiently-out-of-date state being loaded
> automatically; there are also internal HW latencies involved in the
> loading of MUX configurations which would be difficult to account for
> from the command streamer (and we only want to enable the unit when once
> the MUX configuration is complete).
>
> Since the Gen8+ OA unit design no longer supports clock gating the unit
> off for a single given context (which effectively stopped any progress
> of counters while any other context was running) and instead supports
> tagging OA reports with a context ID for filtering on the CPU, it means
> we can no longer hide the system-wide progress of counters from a
> non-privileged application only interested in metrics for its own
> context. Although we could theoretically try and subtract the progress
> of other contexts before forwarding reports via read() we aren't in a
> position to filter reports captured via MI_REPORT_PERF_COUNT commands.
> As a result, for Gen8+, we always require the
> dev.i915.perf_stream_paranoid to be unset for any access to OA metrics
> if not root.
>
> Signed-off-by: Robert Bragg <robert@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 29 +-
> drivers/gpu/drm/i915/i915_gem_context.h | 1 +
> drivers/gpu/drm/i915/i915_perf.c | 1034 ++++++++++++++++++++++++++++-- -
> drivers/gpu/drm/i915/i915_reg.h | 22 +
> drivers/gpu/drm/i915/intel_lrc.c | 5 +
> include/uapi/drm/i915_drm.h | 19 +-
> 6 files changed, 1029 insertions(+), 81 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_ drv.h
> index c4156a8a5dc0..190e699d5851 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -731,6 +731,7 @@ intel_uncore_forcewake_for_reg(struct drm_i915_private *dev_priv,
> i915_reg_t reg, unsigned int op);
>
> struct intel_uncore_funcs {
> + int (*wait_for_rcs_busy)(struct drm_i915_private *dev_priv);
Ah, yup, removed now.
Could we use _offset, for a second I thought were actually turning something off...
> void (*force_wake_get)(struct drm_i915_private *dev_priv,
> enum forcewake_domains domains);
> void (*force_wake_put)(struct drm_i915_private *dev_priv,
> @@ -2084,9 +2085,17 @@ struct i915_oa_ops {
> void (*init_oa_buffer)(struct drm_i915_private *dev_priv);
>
> /**
> - * @enable_metric_set: Applies any MUX configuration to set up the
> - * Boolean and Custom (B/C) counters that are part of the counter
> - * reports being sampled. May apply system constraints such as
> + * @select_metric_set: The auto generated code that checks whether a
> + * requested OA config is applicable to the system and if so sets up
> + * the mux, oa and flex eu register config pointers according to the
> + * current dev_priv->perf.oa.metrics_set.
> + */
> + int (*select_metric_set)(struct drm_i915_private *dev_priv);
> +
> + /**
> + * @enable_metric_set: Selects and applies any MUX configuration to set
> + * up the Boolean and Custom (B/C) counters that are part of the
> + * counter reports being sampled. May apply system constraints such as
> * disabling EU clock gating as required.
> */
> int (*enable_metric_set)(struct drm_i915_private *dev_priv);
> @@ -2492,6 +2501,7 @@ struct drm_i915_private {
> struct {
> struct i915_vma *vma;
> u8 *vaddr;
> + u32 last_ctx_id;
> int format;
> int format_size;
>
> @@ -2561,6 +2571,14 @@ struct drm_i915_private {
> } oa_buffer;
>
> u32 gen7_latched_oastatus1;
> + u32 ctx_oactxctrl_off;
> + u32 ctx_flexeu0_off;
Yeah, sounds better.
Would the expectation be that userspace would peek at the reason field?
> +
> + /* The RPT_ID/reason field for Gen8+ includes a bit
> + * to determine if the CTX ID in the report is valid
> + * but the specific bit differs between Gen 8 and 9
> + */
> + u32 gen8_valid_ctx_bit;
>
> struct i915_oa_ops ops;
> const struct i915_oa_format *oa_formats;
> @@ -2871,6 +2889,8 @@ intel_info(const struct drm_i915_private *dev_priv)
> #define IS_KBL_ULX(dev_priv) (INTEL_DEVID(dev_priv) == 0x590E || \
> INTEL_DEVID(dev_priv) == 0x5915 || \
> INTEL_DEVID(dev_priv) == 0x591E)
> +#define IS_SKL_GT2(dev_priv) (IS_SKYLAKE(dev_priv) && \
> + (INTEL_DEVID(dev_priv) & 0x00F0) == 0x0010)
> #define IS_SKL_GT3(dev_priv) (IS_SKYLAKE(dev_priv) && \
> (INTEL_DEVID(dev_priv) & 0x00F0) == 0x0020)
> #define IS_SKL_GT4(dev_priv) (IS_SKYLAKE(dev_priv) && \
> @@ -3622,6 +3642,9 @@ i915_gem_context_lookup_timeline(struct i915_gem_context *ctx,
>
> int i915_perf_open_ioctl(struct drm_device *dev, void *data,
> struct drm_file *file);
> +void i915_oa_update_reg_state(struct intel_engine_cs *engine,
> + struct i915_gem_context *ctx,
> + uint32_t *reg_state);
>
> /* i915_gem_evict.c */
> int __must_check i915_gem_evict_something(struct i915_address_space *vm,
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.h b/drivers/gpu/drm/i915/i915_ gem_context.h
> index 4af2ab94558b..3f4ce73bea43 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.h
> +++ b/drivers/gpu/drm/i915/i915_gem_context.h
> @@ -151,6 +151,7 @@ struct i915_gem_context {
> u64 lrc_desc;
> int pin_count;
> bool initialised;
> + atomic_t oa_state_dirty;
> } engine[I915_NUM_ENGINES];
>
> /** ring_size: size for allocating the per-engine ring buffer */
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_ perf.c
> index 36d07ca68029..dc5f0121e305 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -196,6 +196,12 @@
>
> #include "i915_drv.h"
> #include "i915_oa_hsw.h"
> +#include "i915_oa_bdw.h"
> +#include "i915_oa_chv.h"
> +#include "i915_oa_sklgt2.h"
> +#include "i915_oa_sklgt3.h"
> +#include "i915_oa_sklgt4.h"
> +#include "i915_oa_bxt.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
> @@ -272,6 +278,13 @@ static u32 i915_perf_stream_paranoid = true;
>
> #define INVALID_CTX_ID 0xffffffff
>
> +/* On Gen8+ automatically triggered OA reports include a 'reason' field... */
> +#define OAREPORT_REASON_MASK 0x3f
> +#define OAREPORT_REASON_SHIFT 19
> +#define OAREPORT_REASON_TIMER (1<<0)
> +#define OAREPORT_REASON_CTX_SWITCH (1<<3)
> +#define OAREPORT_REASON_CLK_RATIO (1<<5)
If so do we not want to throw this stuff in i915_drm.h?
I consider this part of the hardware interface documented in the PRMs for userspace to reference, not software ABI. Maybe a grey area but it doesn't seem to me that it should be in i915_drm.h.
You didn't fancy turning this into a vfunc or something, the gen7
> +
>
> /* For sysctl proc_dointvec_minmax of i915_oa_max_sample_rate
> *
> @@ -303,6 +316,13 @@ static struct i915_oa_format hsw_oa_formats[I915_OA_FORMAT_MAX] = {
> [I915_OA_FORMAT_C4_B8] = { 7, 64 },
> };
>
> +static struct i915_oa_format gen8_plus_oa_formats[I915_OA_FORMAT_MAX] = {
> + [I915_OA_FORMAT_A12] = { 0, 64 },
> + [I915_OA_FORMAT_A12_B8_C8] = { 2, 128 },
> + [I915_OA_FORMAT_A32u40_A4u32_B8_C8] = { 5, 256 },
> + [I915_OA_FORMAT_C4_B8] = { 7, 64 },
> +};
> +
> #define SAMPLE_OA_REPORT (1<<0)
>
> /**
> @@ -333,6 +353,122 @@ struct perf_open_properties {
> };
>
> /**
> + * gen8_oa_buffer_check_unlocked - check for data and update tail ptr state
> + * @dev_priv: i915 device instance
> + *
> + * This is either called via fops (for blocking reads in user ctx) or the poll
> + * check hrtimer (atomic ctx) to check the OA buffer tail pointer and check
> + * if there is data available for userspace to read.
> + *
> + * This function is central to providing a workaround for the OA unit tail
> + * pointer having a race with respect to what data is visible to the CPU.
> + * It is responsible for reading tail pointers from the hardware and giving
> + * the pointers time to 'age' before they are made available for reading.
> + * (See description of OA_TAIL_MARGIN_NSEC above for further details.)
> + *
> + * Besides returning true when there is data available to read() this function
> + * also has the side effect of updating the oa_buffer.tails[], .aging_timestamp
> + * and .aged_tail_idx state used for reading.
> + *
> + * Note: 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.
> + *
> + * Returns: %true if the OA buffer contains data, else %false
> + */
> +static bool gen8_oa_buffer_check_unlocked(struct drm_i915_private *dev_priv)
> +{
> + int report_size = dev_priv->perf.oa.oa_buffer.format_size;
> + unsigned long flags;
> + unsigned int aged_idx;
> + u32 head, hw_tail, aged_tail, aging_tail;
> + u64 now;
> +
> + /* We have to consider the (unlikely) possibility that read() errors
> + * could result in an OA buffer reset which might reset the head,
> + * tails[] and aged_tail state.
> + */
> + spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags);
> +
> + /* NB: The head we observe here might effectively be a little out of
> + * date (between head and tails[aged_idx].offset if there is currently
> + * a read() in progress.
> + */
> + head = dev_priv->perf.oa.oa_buffer.head;
> +
> + aged_idx = dev_priv->perf.oa.oa_buffer.aged_tail_idx;
> + aged_tail = dev_priv->perf.oa.oa_buffer.tails[aged_idx].offset;
> + aging_tail = dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset;
> +
> + hw_tail = I915_READ(GEN8_OATAILPTR) & GEN8_OATAILPTR_MASK;
oa_buffer_check is identical except for the tail register business?
Yeah, it had definitly crossed my mind to do this, and I'd been considering doing this as a follow up, but it's probably worth just doing upfront instead. It's not great to have a copy of this fiddly workaround code.
Okey, just made the change locally and will send out in a bit.
updated @read_state ?
> +
> + /* The tail pointer increases in 64 byte increments,
> + * not in report_size steps...
> + */
> + hw_tail &= ~(report_size - 1);
> +
> + now = ktime_get_mono_fast_ns();
> +
> + /* Update the aged tail
> + *
> + * Flip the tail pointer available for read()s once the aging tail is
> + * old enough to trust that the corresponding data will be visible to
> + * the CPU...
> + *
> + * Do this before updating the aging pointer in case we may be able to
> + * immediately start aging a new pointer too (if new data has become
> + * available) without needing to wait for a later hrtimer callback.
> + */
> + if (aging_tail != INVALID_TAIL_PTR &&
> + ((now - dev_priv->perf.oa.oa_buffer.aging_timestamp) >
> + OA_TAIL_MARGIN_NSEC)) {
> +
> + aged_idx ^= 1;
> + dev_priv->perf.oa.oa_buffer.aged_tail_idx = aged_idx;
> +
> + aged_tail = aging_tail;
> +
> + /* Mark that we need a new pointer to start aging... */
> + dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset = INVALID_TAIL_PTR;
> + aging_tail = INVALID_TAIL_PTR;
> + }
> +
> + /* Update the aging tail
> + *
> + * We throttle aging tail updates until we have a new tail that
> + * represents >= one report more data than is already available for
> + * reading. This ensures there will be enough data for a successful
> + * read once this new pointer has aged and ensures we will give the new
> + * pointer time to age.
> + */
> + if (aging_tail == INVALID_TAIL_PTR &&
> + (aged_tail == INVALID_TAIL_PTR ||
> + OA_TAKEN(hw_tail, aged_tail) >= report_size)) {
> + struct i915_vma *vma = dev_priv->perf.oa.oa_buffer.vma;
> + u32 gtt_offset = i915_ggtt_offset(vma);
> +
> + /* Be paranoid and do a bounds check on the pointer read back
> + * from hardware, just in case some spurious hardware condition
> + * could put the tail out of bounds...
> + */
> + if (hw_tail >= gtt_offset &&
> + hw_tail < (gtt_offset + OA_BUFFER_SIZE)) {
> + dev_priv->perf.oa.oa_buffer.tails[!aged_idx].offset =
> + aging_tail = hw_tail;
> + dev_priv->perf.oa.oa_buffer.aging_timestamp = now;
> + } else {
> + DRM_ERROR("Ignoring spurious out of range OA buffer tail pointer = %u\n",
> + hw_tail);
> + }
> + }
> +
> + spin_unlock_irqrestore(&dev_priv->perf.oa.oa_buffer.ptr_ lock, flags);
> +
> + return aged_tail == INVALID_TAIL_PTR ?
> + false : OA_TAKEN(aged_tail, head) >= report_size;
> +}
> +
> +/**
> * gen7_oa_buffer_check_unlocked - check for data and update tail ptr state
> * @dev_priv: i915 device instance
> *
> @@ -553,6 +689,284 @@ static int append_oa_sample(struct i915_perf_stream *stream,
> *
> * Returns: 0 on success, negative error code on failure.
> */
> +static int gen8_append_oa_reports(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;
> + u8 *oa_buf_base = dev_priv->perf.oa.oa_buffer.vaddr;
> + u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
> + u32 mask = (OA_BUFFER_SIZE - 1);
> + size_t start_offset = *offset;
> + unsigned long flags;
> + unsigned int aged_tail_idx;
> + u32 head, tail;
> + u32 taken;
> + int ret = 0;
> +
> + if (WARN_ON(!stream->enabled))
> + return -EIO;
> +
> + spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags);
> +
> + head = dev_priv->perf.oa.oa_buffer.head;
> + aged_tail_idx = dev_priv->perf.oa.oa_buffer.aged_tail_idx;
> + tail = dev_priv->perf.oa.oa_buffer.tails[aged_tail_idx].offset;
> +
> + spin_unlock_irqrestore(&dev_priv->perf.oa.oa_buffer.ptr_ lock, flags);
> +
> + /* An invalid tail pointer here means we're still waiting for the poll
> + * hrtimer callback to give us a pointer
> + */
> + if (tail == INVALID_TAIL_PTR)
> + return -EAGAIN;
> +
> + /* NB: oa_buffer.head/tail include the gtt_offset which we don't want
> + * while indexing relative to oa_buf_base.
> + */
> + head -= gtt_offset;
> + tail -= gtt_offset;
> +
> + /* An out of bounds or misaligned head or tail pointer implies a driver
> + * bug since we validate + align the tail pointers we read from the
> + * hardware and we are in full control of the head pointer which should
> + * only be incremented by multiples of the report size (notably also
> + * all a power of two).
> + */
> + if (WARN_ONCE(head > OA_BUFFER_SIZE || head % report_size ||
> + tail > OA_BUFFER_SIZE || tail % report_size,
> + "Inconsistent OA buffer pointers: head = %u, tail = %u\n",
> + head, tail))
> + return -EIO;
> +
> +
> + for (/* none */;
> + (taken = OA_TAKEN(tail, head));
> + head = (head + report_size) & mask) {
> + u8 *report = oa_buf_base + head;
> + u32 *report32 = (void *)report;
> + u32 ctx_id;
> + u32 reason;
> +
> + /* 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 reason field includes flags identifying what
> + * triggered this specific report (mostly timer
> + * triggered or e.g. due to a context switch).
> + *
> + * This field is never expected to be zero so we can
> + * check that the report isn't invalid before copying
> + * it to userspace...
> + */
> + reason = ((report32[0] >> OAREPORT_REASON_SHIFT) &
> + OAREPORT_REASON_MASK);
> + if (reason == 0) {
> + if (__ratelimit(&dev_priv->perf.oa.spurious_report_rs))
> + DRM_NOTE("Skipping spurious, invalid OA report\n");
> + continue;
> + }
> +
> + /* XXX: Just keep the lower 21 bits for now since I'm not
> + * entirely sure if the HW touches any of the higher bits in
> + * this field
> + */
> + ctx_id = report32[2] & 0x1fffff;
> +
> + /* Squash whatever is in the CTX_ID field if it's
> + * marked as invalid to be sure we avoid
> + * false-positive, single-context filtering below...
> + */
> + if (!(report32[0] & dev_priv->perf.oa.gen8_valid_ctx_bit))
> + ctx_id = report32[2] = INVALID_CTX_ID;
> +
> + /* NB: For Gen 8 the OA unit no longer supports clock gating
> + * off for a specific context and the kernel can't securely
> + * stop the counters from updating as system-wide / global
> + * values.
> + *
> + * Automatic reports now include a context ID so reports can be
> + * filtered on the cpu but it's not worth trying to
> + * automatically subtract/hide counter progress for other
> + * contexts while filtering since we can't stop userspace
> + * issuing MI_REPORT_PERF_COUNT commands which would still
> + * provide a side-band view of the real values.
> + *
> + * To allow userspace (such as Mesa/GL_INTEL_performance_query)
> + * to normalize counters for a single filtered context then it
> + * needs be forwarded bookend context-switch reports so that it
> + * can track switches in between MI_REPORT_PERF_COUNT commands
> + * and can itself subtract/ignore the progress of counters
> + * associated with other contexts. Note that the hardware
> + * automatically triggers reports when switching to a new
> + * context which are tagged with the ID of the newly active
> + * context. To avoid the complexity (and likely fragility) of
> + * reading ahead while parsing reports to try and minimize
> + * forwarding redundant context switch reports (i.e. between
> + * other, unrelated contexts) we simply elect to forward them
> + * all.
> + *
> + * We don't rely solely on the reason field to identify context
> + * switches since it's not-uncommon for periodic samples to
> + * identify a switch before any 'context switch' report.
> + */
> + if (!dev_priv->perf.oa.exclusive_stream->ctx ||
> + dev_priv->perf.oa.specific_ctx_id == ctx_id ||
> + (dev_priv->perf.oa.oa_buffer.last_ctx_id ==
> + dev_priv->perf.oa.specific_ctx_id) ||
> + reason & OAREPORT_REASON_CTX_SWITCH) {
> +
> + /* While filtering for a single context we avoid
> + * leaking the IDs of other contexts.
> + */
> + if (dev_priv->perf.oa.exclusive_stream->ctx &&
> + dev_priv->perf.oa.specific_ctx_id != ctx_id) {
> + report32[2] = INVALID_CTX_ID;
> + }
> +
> + ret = append_oa_sample(stream, buf, count, offset,
> + report);
> + if (ret)
> + break;
> +
> + dev_priv->perf.oa.oa_buffer.last_ctx_id = ctx_id;
> + }
> +
> + /* The above reason 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;
> + }
> +
> + if (start_offset != *offset) {
> + spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags);
> +
> + /* We removed the gtt_offset for the copy loop above, indexing
> + * relative to oa_buf_base so put back here...
> + */
> + head += gtt_offset;
> +
> + I915_WRITE(GEN8_OAHEADPTR, head & GEN8_OAHEADPTR_MASK);
> + dev_priv->perf.oa.oa_buffer.head = head;
> +
> + spin_unlock_irqrestore(&dev_priv->perf.oa.oa_buffer.ptr_ lock, flags);
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * gen8_oa_read - copy status records then buffered OA reports
> + * @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
> + *
> + * Checks OA unit status registers and if necessary appends corresponding
> + * status records for userspace (such as for a buffer full condition) and then
> + * initiate appending any buffered OA reports.
> + *
> + * Updates @offset according to the number of bytes successfully copied into
> + * the userspace buffer.
> + *
> + * NB: some data may be successfully copied to the userspace buffer
> + * even if an error is returned, and this is reflected in the
> + * updated @read_state.
Ah, the api used to return the offset via a @read_state structure, this should be 'updated @offset'
return -EINVAL ?
> + *
> + * Returns: zero on success or a negative error code
> + */
> +static int gen8_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;
> + u32 oastatus;
> + int ret;
> +
> + if (WARN_ON(!dev_priv->perf.oa.oa_buffer.vaddr))
> + return -EIO;
> +
> + oastatus = I915_READ(GEN8_OASTATUS);
> +
> + /* We treat OABUFFER_OVERFLOW as a significant error:
> + *
> + * Although theoretically we could handle this more gracefully
> + * sometimes, some Gens don't correctly suppress certain
> + * automatically triggered reports in this condition and so we
> + * have to assume that old reports are now being trampled
> + * over.
> + *
> + * Considering how we don't currently give userspace control
> + * over the OA buffer size and always configure a large 16MB
> + * buffer, then a buffer overflow does anyway likely indicate
> + * that something has gone quite badly wrong.
> + */
> + if (oastatus & GEN8_OASTATUS_OABUFFER_OVERFLOW) {
> + ret = append_oa_status(stream, buf, count, offset,
> + DRM_I915_PERF_RECORD_OA_BUFFER_LOST);
> + if (ret)
> + return ret;
> +
> + DRM_DEBUG("OA buffer overflow (exponent = %d): force restart\n",
> + dev_priv->perf.oa.period_exponent);
> +
> + dev_priv->perf.oa.ops.oa_disable(dev_priv);
> + dev_priv->perf.oa.ops.oa_enable(dev_priv);
> +
> + /* Note: .oa_enable() is expected to re-init the oabuffer
> + * and reset GEN8_OASTATUS for us
> + */
> + oastatus = I915_READ(GEN8_OASTATUS);
> + }
> +
> + if (oastatus & GEN8_OASTATUS_REPORT_LOST) {
> + ret = append_oa_status(stream, buf, count, offset,
> + DRM_I915_PERF_RECORD_OA_REPORT_LOST);
> + if (ret == 0) {
> + I915_WRITE(GEN8_OASTATUS,
> + oastatus & ~GEN8_OASTATUS_REPORT_LOST);
> + }
> + }
> +
> + return gen8_append_oa_reports(stream, buf, count, offset);
> +}
> +
> +/**
> + * 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
> + *
> + * 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 tail chases the head?... If you think that's mad
> + * and back-to-front you're not alone, but this follows the
> + * Gen PRM naming convention.
> + *
> + * Returns: 0 on success, negative error code on failure.
> + */
> static int gen7_append_oa_reports(struct i915_perf_stream *stream,
> char __user *buf,
> size_t count,
> @@ -733,7 +1147,8 @@ static int gen7_oa_read(struct i915_perf_stream *stream,
> if (ret)
> return ret;
>
> - DRM_DEBUG("OA buffer overflow: force restart\n");
> + DRM_DEBUG("OA buffer overflow (exponent = %d): force restart\n",
> + dev_priv->perf.oa.period_exponent);
>
> dev_priv->perf.oa.ops.oa_disable(dev_priv);
> dev_priv->perf.oa.ops.oa_enable(dev_priv);
> @@ -833,33 +1248,37 @@ static int i915_oa_read(struct i915_perf_stream *stream,
> static int oa_get_render_ctx_id(struct i915_perf_stream *stream)
> {
> struct drm_i915_private *dev_priv = stream->dev_priv;
> - struct intel_engine_cs *engine = dev_priv->engine[RCS];
> - int ret;
>
> - ret = i915_mutex_lock_interruptible(&dev_priv->drm);
> - if (ret)
> - return ret;
> + if (i915.enable_execlists)
> + dev_priv->perf.oa.specific_ctx_id = stream->ctx->hw_id;
> + else {
> + struct intel_engine_cs *engine = dev_priv->engine[RCS];
> + int 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...
> - */
> - ret = engine->context_pin(engine, stream->ctx);
> - if (ret)
> - goto unlock;
> + ret = i915_mutex_lock_interruptible(&dev_priv->drm);
> + if (ret)
> + return ret;
>
> - /* 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(stream->ctx->engine[engine->id].state);
> + /* As the ID is the gtt offset of the context's vma we pin
> + * the vma to ensure the ID remains fixed.
> + */
> + ret = engine->context_pin(engine, stream->ctx);
> + if (ret) {
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> + return ret;
> + }
>
> -unlock:
> - mutex_unlock(&dev_priv->drm.struct_mutex);
> + /* 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(stream->ctx->engine[engine->id].state);
>
> - return ret;
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> + }
> +
> + return 0;
> }
>
> /**
> @@ -874,12 +1293,16 @@ static void oa_put_render_ctx_id(struct i915_perf_stream *stream)
> struct drm_i915_private *dev_priv = stream->dev_priv;
> struct intel_engine_cs *engine = dev_priv->engine[RCS];
>
> - mutex_lock(&dev_priv->drm.struct_mutex);
> + if (i915.enable_execlists) {
> + dev_priv->perf.oa.specific_ctx_id = INVALID_CTX_ID;
> + } else {
> + mutex_lock(&dev_priv->drm.struct_mutex);
>
> - dev_priv->perf.oa.specific_ctx_id = INVALID_CTX_ID;
> - engine->context_unpin(engine, stream->ctx);
> + dev_priv->perf.oa.specific_ctx_id = INVALID_CTX_ID;
> + engine->context_unpin(engine, stream->ctx);
>
> - mutex_unlock(&dev_priv->drm.struct_mutex);
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> + }
> }
>
> static void
> @@ -964,6 +1387,56 @@ static void gen7_init_oa_buffer(struct drm_i915_private *dev_priv)
> dev_priv->perf.oa.pollin = false;
> }
>
> +static void gen8_init_oa_buffer(struct drm_i915_private *dev_priv)
> +{
> + u32 gtt_offset = i915_ggtt_offset(dev_priv->perf.oa.oa_buffer.vma);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&dev_priv->perf.oa.oa_buffer.ptr_lock, flags);
> +
> + I915_WRITE(GEN8_OASTATUS, 0);
> + I915_WRITE(GEN8_OAHEADPTR, gtt_offset);
> + dev_priv->perf.oa.oa_buffer.head = gtt_offset;
> +
> + I915_WRITE(GEN8_OABUFFER_UDW, 0);
> +
> + /* PRM says:
> + *
> + * "This MMIO must be set before the OATAILPTR
> + * register and after the OAHEADPTR register. This is
> + * to enable proper functionality of the overflow
> + * bit."
> + */
> + I915_WRITE(GEN8_OABUFFER, gtt_offset |
> + OABUFFER_SIZE_16M | OA_MEM_SELECT_GGTT);
> + I915_WRITE(GEN8_OATAILPTR, gtt_offset & GEN8_OATAILPTR_MASK);
> +
> + /* Mark that we need updated tail pointers to read from... */
> + dev_priv->perf.oa.oa_buffer.tails[0].offset = INVALID_TAIL_PTR;
> + dev_priv->perf.oa.oa_buffer.tails[1].offset = INVALID_TAIL_PTR;
> +
> + spin_unlock_irqrestore(&dev_priv->perf.oa.oa_buffer.ptr_ lock, flags);
> +
> +
> + /* 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 gen8_append_oa_reports() that looks at the
> + * reason 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;
> @@ -1108,6 +1581,200 @@ static void hsw_disable_metric_set(struct drm_i915_private *dev_priv)
> ~GT_NOA_ENABLE));
> }
>
> +/*
> + * From Broadwell PRM, 3D-Media-GPGPU -> Register State Context
> + *
> + * MMIO reads or writes to any of the registers listed in the
> + * “Register State Context image” subsections through HOST/IA
> + * MMIO interface for debug purposes must follow the steps below:
> + *
> + * - SW should set the Force Wakeup bit to prevent GT from entering C6.
> + * - Write 0x2050[31:0] = 0x00010001 (disable sequence).
> + * - Disable IDLE messaging in CS (Write 0x2050[31:0] = 0x00010001).
> + * - BDW: Poll/Wait for register bits of 0x22AC[6:0] turn to 0x30 value.
> + * - SKL+: Poll/Wait for register bits of 0x22A4[6:0] turn to 0x30 value.
> + * - Read/Write to desired MMIO registers.
> + * - Enable IDLE messaging in CS (Write 0x2050[31:0] = 0x00010000).
> + * - Force Wakeup bit should be reset to enable C6 entry.
> + *
> + * XXX: don't nest or overlap calls to this API, it has no ref
> + * counting to track how many entities require the RCS to be
> + * blocked from being idle.
> + */
> +static int gen8_begin_ctx_mmio(struct drm_i915_private *dev_priv)
> +{
> + i915_reg_t fsm_reg = dev_priv->info.gen > 8 ?
> + GEN9_RCS_FE_FSM2 : GEN6_RCS_PWR_FSM;
> + int ret = 0;
> +
> + /* There's only no active context while idle in execlist mode
> + * (though we shouldn't be using this in any other case)
> + */
> + if (WARN_ON(!i915.enable_execlists))
> + return ret;
Ah yup.
Missing newline for DRM_ERROR.
> +
> + intel_uncore_forcewake_get(dev_priv, FORCEWAKE_RENDER);
> +
> + I915_WRITE(GEN6_RC_SLEEP_PSMI_CONTROL,
> + _MASKED_BIT_ENABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
> +
> + /* Note: we don't currently have a good handle on the maximum
> + * latency for this wake up so while we only need to hold rcs
> + * busy from process context we at least keep the waiting
> + * interruptible...
> + */
> + ret = wait_for((I915_READ(fsm_reg) & 0x3f) == 0x30, 50);
> + if (ret)
> + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_RENDER);
> +
> + return ret;
> +}
> +
> +static void gen8_end_ctx_mmio(struct drm_i915_private *dev_priv)
> +{
> + if (WARN_ON(!i915.enable_execlists))
> + return;
> +
> + I915_WRITE(GEN6_RC_SLEEP_PSMI_CONTROL,
> + _MASKED_BIT_DISABLE(GEN6_PSMI_SLEEP_MSG_DISABLE));
> + intel_uncore_forcewake_put(dev_priv, FORCEWAKE_RENDER);
> +}
> +
> +/* Manages updating the per-context aspects of the OA stream
> + * configuration across all contexts.
> + *
> + * The awkward consideration here is that OACTXCONTROL controls the
> + * exponent for periodic sampling which is primarily used for system
> + * wide profiling where we'd like a consistent sampling period even in
> + * the face of context switches.
> + *
> + * Our approach of updating the register state context (as opposed to
> + * say using a workaround batch buffer) ensures that the hardware
> + * won't automatically reload an out-of-date timer exponent even
> + * transiently before a WA BB could be parsed.
> + *
> + * This function needs to:
> + * - Ensure the currently running context's per-context OA state is
> + * updated
> + * - Ensure that all existing contexts will have the correct per-context
> + * OA state if they are scheduled for use.
> + * - Ensure any new contexts will be initialized with the correct
> + * per-context OA state.
> + *
> + * Note: it's only the RCS/Render context that has any OA state.
> + */
> +static int configure_all_contexts(struct drm_i915_private *dev_priv)
> +{
> + struct i915_gem_context *ctx;
> + int ret;
> +
> + ret = i915_mutex_lock_interruptible(&dev_priv->drm);
> + if (ret)
> + return ret;
> +
> + /* Since execlist submission may be happening asynchronously here then
> + * we first mark existing contexts dirty before we update the current
> + * context so if any switches happen in the middle we can expect
> + * that the act of scheduling will have itself ensured a consistent
> + * OA state update.
> + */
> + list_for_each_entry(ctx, &dev_priv->context_list, link) {
> + /* The actual update of the register state context will happen
> + * the next time this logical ring is submitted. (See
> + * i915_oa_update_reg_state() which hooks into
> + * execlists_update_context())
> + */
> + atomic_set(&ctx->engine[RCS].oa_state_dirty, 1);
> + }
> +
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> + /* Now update the current context.
> + *
> + * Note: Using MMIO to update per-context registers requires
> + * some extra care...
> + */
> + ret = gen8_begin_ctx_mmio(dev_priv);
> + if (ret) {
> + DRM_ERROR("Failed to bring RCS out of idle to update current ctx OA state");
fixed
Check the return value here, and bubble up.
> + return ret;
> + }
> +
> + I915_WRITE(GEN8_OACTXCONTROL, ((dev_priv->perf.oa.period_exponent <<
> + GEN8_OA_TIMER_PERIOD_SHIFT) |
> + (dev_priv->perf.oa.periodic ?
> + GEN8_OA_TIMER_ENABLE : 0) |
> + GEN8_OA_COUNTER_RESUME));
> +
> + config_oa_regs(dev_priv, dev_priv->perf.oa.flex_regs,
> + dev_priv->perf.oa.flex_regs_len);
> +
> + gen8_end_ctx_mmio(dev_priv);
> +
> + return 0;
> +}
> +
> +static int gen8_enable_metric_set(struct drm_i915_private *dev_priv)
> +{
> + int ret = dev_priv->perf.oa.ops.select_metric_set(dev_priv);
> +
> + if (ret)
> + return ret;
> +
> + /* We disable slice/unslice clock ratio change reports on SKL since
> + * they are too noisy. The HW generates a lot of redundant reports
> + * where the ratio hasn't really changed causing a lot of redundant
> + * work to processes and increasing the chances we'll hit buffer
> + * overruns.
> + *
> + * Although we don't currently use the 'disable overrun' OABUFFER
> + * feature it's worth noting that clock ratio reports have to be
> + * disabled before considering to use that feature since the HW doesn't
> + * correctly block these reports.
> + *
> + * Currently none of the high-level metrics we have depend on knowing
> + * this ratio to normalize.
> + *
> + * Note: This register is not power context saved and restored, but
> + * that's OK considering that we disable RC6 while the OA unit is
> + * enabled.
> + *
> + * The _INCLUDE_CLK_RATIO bit allows the slice/unslice frequency to
> + * be read back from automatically triggered reports, as part of the
> + * RPT_ID field.
> + */
> + if (IS_SKYLAKE(dev_priv) || IS_BROXTON(dev_priv)) {
> + I915_WRITE(GEN8_OA_DEBUG,
> + _MASKED_BIT_ENABLE(GEN9_OA_DEBUG_DISABLE_CLK_RATIO_ REPORTS |
> + GEN9_OA_DEBUG_INCLUDE_CLK_RATIO));
> + }
> +
> + I915_WRITE(GDT_CHICKEN_BITS, 0xA0);
> + config_oa_regs(dev_priv, dev_priv->perf.oa.mux_regs,
> + dev_priv->perf.oa.mux_regs_len);
> + I915_WRITE(GDT_CHICKEN_BITS, 0x80);
> +
> + /* It takes a fairly long time for a new MUX configuration to
> + * be be applied after these register writes. This delay
> + * duration is take from Haswell (derived empirically based on
> + * the render_basic config) but hopefully it covers the
> + * maximum configuration latency for Gen8+ too...
> + */
> + usleep_range(15000, 20000);
> +
> + config_oa_regs(dev_priv, dev_priv->perf.oa.b_counter_regs,
> + dev_priv->perf.oa.b_counter_regs_len);
> +
> + configure_all_contexts(dev_priv);
Oops, right, fixed.
u32 for consistency, elsewhere also.
> +
> + return 0;
> +}
> +
> +static void gen8_disable_metric_set(struct drm_i915_private *dev_priv)
> +{
> + /* NOP */
> +}
> +
> static void gen7_update_oacontrol_locked(struct drm_i915_private *dev_priv)
> {
> lockdep_assert_held(&dev_priv->perf.hook_lock);
> @@ -1152,6 +1819,29 @@ static void gen7_oa_enable(struct drm_i915_private *dev_priv)
> spin_unlock_irqrestore(&dev_priv->perf.hook_lock, flags);
> }
>
> +static void gen8_oa_enable(struct drm_i915_private *dev_priv)
> +{
> + u32 report_format = dev_priv->perf.oa.oa_buffer.format;
> +
> + /* 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.
> + */
> + gen8_init_oa_buffer(dev_priv);
> +
> + /* Note: we don't rely on the hardware to perform single context
> + * filtering and instead filter on the cpu based on the context-id
> + * field of reports
> + */
> + I915_WRITE(GEN8_OACONTROL, (report_format <<
> + GEN8_OA_REPORT_FORMAT_SHIFT) |
> + GEN8_OA_COUNTER_ENABLE);
> +}
> +
> /**
> * i915_oa_stream_enable - handle `I915_PERF_IOCTL_ENABLE` for OA stream
> * @stream: An i915 perf stream opened for OA metrics
> @@ -1178,6 +1868,11 @@ static void gen7_oa_disable(struct drm_i915_private *dev_priv)
> I915_WRITE(GEN7_OACONTROL, 0);
> }
>
> +static void gen8_oa_disable(struct drm_i915_private *dev_priv)
> +{
> + I915_WRITE(GEN8_OACONTROL, 0);
> +}
> +
> /**
> * i915_oa_stream_disable - handle `I915_PERF_IOCTL_DISABLE` for OA stream
> * @stream: An i915 perf stream opened for OA metrics
> @@ -1336,6 +2031,88 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
> return ret;
> }
>
> +/* NB: It must always remain pointer safe to run this even if the OA unit
> + * has been disabled.
> + *
> + * It's fine to put out-of-date values into these per-context registers
> + * in the case that the OA unit has been disabled.
> + */
> +static void gen8_update_reg_state_unlocked(struct intel_engine_cs *engine,
> + struct i915_gem_context *ctx,
> + uint32_t *reg_state)
updated.
> +{
> + struct drm_i915_private *dev_priv = ctx->i915;
> + const struct i915_oa_reg *flex_regs = dev_priv->perf.oa.flex_regs;
> + int n_flex_regs = dev_priv->perf.oa.flex_regs_len; Can we also make these u32, for consistency.
> + int ctx_oactxctrl = dev_priv->perf.oa.ctx_oactxctrl_off;
> + int ctx_flexeu0 = dev_priv->perf.oa.ctx_flexeu0_off;
yup
Maybe a comment for why we don't support legacy mode with gen8+, for the
> + /* The MMIO offsets for Flex EU registers aren't contiguous */
> + u32 flex_mmio[] = {
> + i915_mmio_reg_offset(EU_PERF_CNTL0),
> + i915_mmio_reg_offset(EU_PERF_CNTL1),
> + i915_mmio_reg_offset(EU_PERF_CNTL2),
> + i915_mmio_reg_offset(EU_PERF_CNTL3),
> + i915_mmio_reg_offset(EU_PERF_CNTL4),
> + i915_mmio_reg_offset(EU_PERF_CNTL5),
> + i915_mmio_reg_offset(EU_PERF_CNTL6),
> + };
> + int i;
> +
> + reg_state[ctx_oactxctrl] = i915_mmio_reg_offset(GEN8_OACTXCONTROL);
> + reg_state[ctx_oactxctrl+1] = (dev_priv->perf.oa.period_exponent <<
> + GEN8_OA_TIMER_PERIOD_SHIFT) |
> + (dev_priv->perf.oa.periodic ?
> + GEN8_OA_TIMER_ENABLE : 0) |
> + GEN8_OA_COUNTER_RESUME;
> +
> + for (i = 0; i < ARRAY_SIZE(flex_mmio); i++) {
> + uint32_t state_offset = ctx_flexeu0 + i * 2;
> + uint32_t mmio = flex_mmio[i];
> +
> + /* This arbitrary default will select the 'EU FPU0 Pipeline
> + * Active' event. In the future it's anticipated that there
> + * will be an explicit 'No Event' we can select, but not yet...
> + */
> + uint32_t value = 0;
> + int j;
> +
> + for (j = 0; j < n_flex_regs; j++) {
> + if (i915_mmio_reg_offset(flex_regs[j].addr) == mmio) {
> + value = flex_regs[j].value;
> + break;
> + }
> + }
> +
> + reg_state[state_offset] = mmio;
> + reg_state[state_offset+1] = value;
> + }
> +}
> +
> +void i915_oa_update_reg_state(struct intel_engine_cs *engine,
> + struct i915_gem_context *ctx,
> + uint32_t *reg_state)
> +{
> + struct drm_i915_private *dev_priv = engine->i915;
> +
> + if (engine->id != RCS)
> + return;
> +
> + if (!dev_priv->perf.initialized)
> + return;
> +
> + /* XXX: We don't take a lock here and this may run async with
> + * respect to stream methods. Notably we don't want to block
> + * context switches by long i915 perf read() operations.
> + *
> + * It's expected to always be safe to read the dev_priv->perf
> + * state needed here, and expected to be benign to redundantly
> + * update the state if the OA unit has been disabled since
> + * oa_state_dirty was last set.
> + */
> + if (atomic_cmpxchg(&ctx->engine[engine->id].oa_state_dirty, 1, 0))
> + gen8_update_reg_state_unlocked(engine, ctx, reg_state);
> +}
> +
> /**
> * i915_perf_read_locked - &i915_perf_stream_ops->read with error normalisation
> * @stream: An i915 perf stream
> @@ -1750,6 +2527,7 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
> struct i915_gem_context *specific_ctx = NULL;
> struct i915_perf_stream *stream = NULL;
> unsigned long f_flags = 0;
> + bool privileged_op = true;
> int stream_fd;
> int ret;
>
> @@ -1767,12 +2545,28 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
> }
> }
>
> + /* On Haswell the OA unit supports clock gating off for a specific
> + * context and in this mode there's no visibility of metrics for the
> + * rest of the system, which we consider acceptable for a
> + * non-privileged client.
> + *
> + * For Gen8+ the OA unit no longer supports clock gating off for a
> + * specific context and the kernel can't securely stop the counters
> + * from updating as system-wide / global values. Even though we can
> + * filter reports based on the included context ID we can't block
> + * clients from seeing the raw / global counter values via
> + * MI_REPORT_PERF_COUNT commands and so consider it a privileged op to
> + * enable the OA unit by default.
> + */
> + if (IS_HASWELL(dev_priv) && specific_ctx)
> + privileged_op = false;
> +
> /* Similar to perf's kernel.perf_paranoid_cpu sysctl option
> * we check a dev.i915.perf_stream_paranoid sysctl option
> * to determine if it's ok to access system wide OA counters
> * without CAP_SYS_ADMIN privileges.
> */
> - if (!specific_ctx &&
> + if (privileged_op &&
> i915_perf_stream_paranoid && !capable(CAP_SYS_ADMIN)) {
> DRM_DEBUG("Insufficient privileges to open system-wide i915 perf stream\n");
> ret = -EACCES;
> @@ -2039,9 +2833,6 @@ int i915_perf_open_ioctl(struct drm_device *dev, void *data,
> */
> void i915_perf_register(struct drm_i915_private *dev_priv)
> {
> - if (!IS_HASWELL(dev_priv))
> - return;
> -
> if (!dev_priv->perf.initialized)
> return;
>
> @@ -2057,11 +2848,38 @@ void i915_perf_register(struct drm_i915_private *dev_priv)
> if (!dev_priv->perf.metrics_kobj)
> goto exit;
>
> - if (i915_perf_register_sysfs_hsw(dev_priv)) {
> - kobject_put(dev_priv->perf.metrics_kobj);
> - dev_priv->perf.metrics_kobj = NULL;
> + if (IS_HASWELL(dev_priv)) {
> + if (i915_perf_register_sysfs_hsw(dev_priv))
> + goto sysfs_error;
> + } else if (IS_BROADWELL(dev_priv)) {
> + if (i915_perf_register_sysfs_bdw(dev_priv))
> + goto sysfs_error;
> + } else if (IS_CHERRYVIEW(dev_priv)) {
> + if (i915_perf_register_sysfs_chv(dev_priv))
> + goto sysfs_error;
> + } else if (IS_SKYLAKE(dev_priv)) {
> + if (IS_SKL_GT2(dev_priv)) {
> + if (i915_perf_register_sysfs_sklgt2(dev_priv))
> + goto sysfs_error;
> + } else if (IS_SKL_GT3(dev_priv)) {
> + if (i915_perf_register_sysfs_sklgt3(dev_priv))
> + goto sysfs_error;
> + } else if (IS_SKL_GT4(dev_priv)) {
> + if (i915_perf_register_sysfs_sklgt4(dev_priv))
> + goto sysfs_error;
> + } else
> + goto sysfs_error;
> + } else if (IS_BROXTON(dev_priv)) {
> + if (i915_perf_register_sysfs_bxt(dev_priv))
> + goto sysfs_error;
> }
>
> + goto exit;
> +
> +sysfs_error:
> + kobject_put(dev_priv->perf.metrics_kobj);
> + dev_priv->perf.metrics_kobj = NULL;
> +
> exit:
> mutex_unlock(&dev_priv->perf.lock);
> }
> @@ -2077,13 +2895,24 @@ void i915_perf_register(struct drm_i915_private *dev_priv)
> */
> void i915_perf_unregister(struct drm_i915_private *dev_priv)
> {
> - if (!IS_HASWELL(dev_priv))
> - return;
> -
> if (!dev_priv->perf.metrics_kobj)
> return;
>
> - i915_perf_unregister_sysfs_hsw(dev_priv);
> + if (IS_HASWELL(dev_priv))
> + i915_perf_unregister_sysfs_hsw(dev_priv);
> + else if (IS_BROADWELL(dev_priv))
> + i915_perf_unregister_sysfs_bdw(dev_priv);
> + else if (IS_CHERRYVIEW(dev_priv))
> + i915_perf_unregister_sysfs_chv(dev_priv);
> + else if (IS_SKYLAKE(dev_priv)) {
> + if (IS_SKL_GT2(dev_priv))
> + i915_perf_unregister_sysfs_sklgt2(dev_priv);
> + else if (IS_SKL_GT3(dev_priv))
> + i915_perf_unregister_sysfs_sklgt3(dev_priv);
> + else if (IS_SKL_GT4(dev_priv))
> + i915_perf_unregister_sysfs_sklgt4(dev_priv);
> + } else if (IS_BROXTON(dev_priv))
> + i915_perf_unregister_sysfs_bxt(dev_priv);
>
> kobject_put(dev_priv->perf.metrics_kobj);
> dev_priv->perf.metrics_kobj = NULL;
> @@ -2142,45 +2971,107 @@ static struct ctl_table dev_root[] = {
> */
> void i915_perf_init(struct drm_i915_private *dev_priv)
> {
> - if (!IS_HASWELL(dev_priv))
> - return;
> -
> - /* Using the same limiting factors as printk_ratelimit() */
> - ratelimit_state_init(&dev_priv->perf.oa.spurious_report_ rs,
> - 5 * HZ, 10);
> - /* We use a DRM_NOTE for spurious reports so it would be
> - * inconsistent to print a warning for throttling.
> - */
> - ratelimit_set_flags(&dev_priv->perf.oa.spurious_report_rs,
> - RATELIMIT_MSG_ON_RELEASE);
> -
> - 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);
> + dev_priv->perf.oa.n_builtin_sets = 0;
> +
> + if (IS_HASWELL(dev_priv)) {
> + 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_check =
> + gen7_oa_buffer_check_unlocked;
> +
> + dev_priv->perf.oa.oa_formats = hsw_oa_formats;
> +
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_hsw;
> + } else if (i915.enable_execlists) {
next reader.
It pretty much just came down to simplicity I think. Earlier iterations of the driver did try and support both, but since BDW enables execlist mode by default now it avoided a bunch of complexity to ignore the case with BDW and legacy ringbuffer mode here. I've added a comment.
Not strictly related to this patch, but why do we still need perf.hook_lock?
> + if (IS_GEN8(dev_priv)) {
> + dev_priv->perf.oa.ctx_oactxctrl_off = 0x120;
> + dev_priv->perf.oa.ctx_flexeu0_off = 0x2ce;
> + dev_priv->perf.oa.gen8_valid_ctx_bit = (1<<25);
> +
> + if (IS_BROADWELL(dev_priv)) {
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_bdw;
> + dev_priv->perf.oa.ops.select_metric_set =
> + i915_oa_select_metric_set_bdw;
> + } else if (IS_CHERRYVIEW(dev_priv)) {
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_chv;
> + dev_priv->perf.oa.ops.select_metric_set =
> + i915_oa_select_metric_set_chv;
> + }
> + } else if (IS_GEN9(dev_priv)) {
> + dev_priv->perf.oa.ctx_oactxctrl_off = 0x128;
> + dev_priv->perf.oa.ctx_flexeu0_off = 0x3de;
> + dev_priv->perf.oa.gen8_valid_ctx_bit = (1<<16);
> +
> + if (IS_SKL_GT2(dev_priv)) {
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_sklgt2;
> + dev_priv->perf.oa.ops.select_metric_set =
> + i915_oa_select_metric_set_sklgt2;
> + } else if (IS_SKL_GT3(dev_priv)) {
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_sklgt3;
> + dev_priv->perf.oa.ops.select_metric_set =
> + i915_oa_select_metric_set_sklgt3;
> + } else if (IS_SKL_GT4(dev_priv)) {
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_sklgt4;
> + dev_priv->perf.oa.ops.select_metric_set =
> + i915_oa_select_metric_set_sklgt4;
> + } else if (IS_BROXTON(dev_priv)) {
> + dev_priv->perf.oa.n_builtin_sets =
> + i915_oa_n_builtin_metric_sets_bxt;
> + dev_priv->perf.oa.ops.select_metric_set =
> + i915_oa_select_metric_set_bxt;
> + }
> + }
>
> - INIT_LIST_HEAD(&dev_priv->perf.streams);
> - mutex_init(&dev_priv->perf.lock);
> - spin_lock_init(&dev_priv->perf.hook_lock);
> - spin_lock_init(&dev_priv->perf.oa.oa_buffer.ptr_lock);
> + if (dev_priv->perf.oa.n_builtin_sets) {
> + dev_priv->perf.oa.ops.init_oa_buffer = gen8_init_oa_buffer;
> + dev_priv->perf.oa.ops.enable_metric_set =
> + gen8_enable_metric_set;
> + dev_priv->perf.oa.ops.disable_metric_set =
> + gen8_disable_metric_set;
> + dev_priv->perf.oa.ops.oa_enable = gen8_oa_enable;
> + dev_priv->perf.oa.ops.oa_disable = gen8_oa_disable;
> + dev_priv->perf.oa.ops.read = gen8_oa_read;
> + dev_priv->perf.oa.ops.oa_buffer_check =
> + gen8_oa_buffer_check_unlocked;
> +
> + dev_priv->perf.oa.oa_formats = gen8_plus_oa_formats;
> + }
> + }
>
> - 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_check =
> - gen7_oa_buffer_check_unlocked;
> + if (dev_priv->perf.oa.n_builtin_sets) {
> + /* Using the same limiting factors as printk_ratelimit() */
> + ratelimit_state_init(&dev_priv->perf.oa.spurious_report_ rs,
> + 5 * HZ, 10);
> + /* We use a DRM_NOTE for spurious reports so it would be
> + * inconsistent to print a warning for throttling.
> + */
> + ratelimit_set_flags(&dev_priv->perf.oa.spurious_report_rs,
> + RATELIMIT_MSG_ON_RELEASE);
>
> - dev_priv->perf.oa.oa_formats = hsw_oa_formats;
> + 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);
>
> - dev_priv->perf.oa.n_builtin_sets =
> - i915_oa_n_builtin_metric_sets_hsw;
> + INIT_LIST_HEAD(&dev_priv->perf.streams);
> + mutex_init(&dev_priv->perf.lock);
> + spin_lock_init(&dev_priv->perf.hook_lock);
Right gen7_update_oacontrol_locked can be folded into gen7_oa_enable and the only usage left is actually redundant since gen7 no longer relies on a hook for notifications of context pinning.
I think in some earlier review for HSW I had been a little reluctant to push to remove this lock early since I was using it in the gen8+ patches at the time, but that's not the case anymore. The i915_oa_update_reg_state() hook is designed to be safe to run without any i915-perf specific locking.
I'll aim to address this in a follow up patch.
Thanks for the review, I'll send out an update in a bit.
> ______________________________
> + spin_lock_init(&dev_priv->perf.oa.oa_buffer.ptr_lock);
>
> - dev_priv->perf.sysctl_header = register_sysctl_table(dev_root);
> + dev_priv->perf.sysctl_header = register_sysctl_table(dev_root);
>
> - dev_priv->perf.initialized = true;
> + dev_priv->perf.initialized = true;
> + }
> }
>
> /**
> @@ -2200,5 +3091,6 @@ void i915_perf_fini(struct drm_i915_private *dev_priv)
> unregister_sysctl_table(dev_priv->perf.sysctl_header);
>
> 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 04c8f69fcc62..0052289ed8ad 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -645,6 +645,12 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>
> #define GEN8_OACTXID _MMIO(0x2364)
>
> +#define GEN8_OA_DEBUG _MMIO(0x2B04)
> +#define GEN9_OA_DEBUG_DISABLE_CLK_RATIO_REPORTS (1<<5)
> +#define GEN9_OA_DEBUG_INCLUDE_CLK_RATIO (1<<6)
> +#define GEN9_OA_DEBUG_DISABLE_GO_1_0_REPORTS (1<<2)
> +#define GEN9_OA_DEBUG_DISABLE_CTX_SWITCH_REPORTS (1<<1)
> +
> #define GEN8_OACONTROL _MMIO(0x2B00)
> #define GEN8_OA_REPORT_FORMAT_A12 (0<<2)
> #define GEN8_OA_REPORT_FORMAT_A12_B8_C8 (2<<2)
> @@ -666,6 +672,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
> #define GEN7_OABUFFER_STOP_RESUME_ENABLE (1<<1)
> #define GEN7_OABUFFER_RESUME (1<<0)
>
> +#define GEN8_OABUFFER_UDW _MMIO(0x23b4)
> #define GEN8_OABUFFER _MMIO(0x2b14)
>
> #define GEN7_OASTATUS1 _MMIO(0x2364)
> @@ -684,7 +691,9 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
> #define GEN8_OASTATUS_REPORT_LOST (1<<0)
>
> #define GEN8_OAHEADPTR _MMIO(0x2B0C)
> +#define GEN8_OAHEADPTR_MASK 0xffffffc0
> #define GEN8_OATAILPTR _MMIO(0x2B10)
> +#define GEN8_OATAILPTR_MASK 0xffffffc0
>
> #define OABUFFER_SIZE_128K (0<<3)
> #define OABUFFER_SIZE_256K (1<<3)
> @@ -697,7 +706,17 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>
> #define OA_MEM_SELECT_GGTT (1<<0)
>
> +/*
> + * Flexible, Aggregate EU Counter Registers.
> + * Note: these aren't contiguous
> + */
> #define EU_PERF_CNTL0 _MMIO(0xe458)
> +#define EU_PERF_CNTL1 _MMIO(0xe558)
> +#define EU_PERF_CNTL2 _MMIO(0xe658)
> +#define EU_PERF_CNTL3 _MMIO(0xe758)
> +#define EU_PERF_CNTL4 _MMIO(0xe45c)
> +#define EU_PERF_CNTL5 _MMIO(0xe55c)
> +#define EU_PERF_CNTL6 _MMIO(0xe65c)
>
> #define GDT_CHICKEN_BITS _MMIO(0x9840)
> #define GT_NOA_ENABLE 0x00000080
> @@ -2317,6 +2336,9 @@ enum skl_disp_power_wells {
> #define GEN8_RC_SEMA_IDLE_MSG_DISABLE (1 << 12)
> #define GEN8_FF_DOP_CLOCK_GATE_DISABLE (1<<10)
>
> +#define GEN6_RCS_PWR_FSM _MMIO(0x22ac)
> +#define GEN9_RCS_FE_FSM2 _MMIO(0x22a4)
> +
> /* Fuse readout registers for GT */
> #define CHV_FUSE_GT _MMIO(VLV_DISPLAY_BASE + 0x2168)
> #define CHV_FGT_DISABLE_SS0 (1 << 10)
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_ lrc.c
> index eec1e714f531..e6d9e4197d3d 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -337,6 +337,8 @@ static u64 execlists_update_context(struct drm_i915_gem_request *rq)
> if (ppgtt && !i915_vm_is_48bit(&ppgtt->base))
> execlists_update_context_pdps(ppgtt, reg_state);
>
> + i915_oa_update_reg_state(rq->engine, rq->ctx, reg_state);
> +
> return ce->lrc_desc;
> }
>
> @@ -1878,6 +1880,9 @@ static void execlists_init_reg_state(u32 *regs,
> regs[CTX_LRI_HEADER_2] = MI_LOAD_REGISTER_IMM(1);
> CTX_REG(regs, CTX_R_PWR_CLK_STATE, GEN8_R_PWR_CLK_STATE,
> make_rpcs(dev_priv));
> +
> + atomic_set(&ctx->engine[RCS].oa_state_dirty, 1);
> + i915_oa_update_reg_state(engine, ctx, regs);
> }
> }
>
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index e0599e729e68..03b833849919 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1295,13 +1295,18 @@ struct drm_i915_gem_context_param {
> };
>
> 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_A13 = 1, /* HSW only */
> + I915_OA_FORMAT_A29, /* HSW only */
> + I915_OA_FORMAT_A13_B8_C8, /* HSW only */
> + I915_OA_FORMAT_B4_C8, /* HSW only */
> + I915_OA_FORMAT_A45_B8_C8, /* HSW only */
> + I915_OA_FORMAT_B4_C8_A16, /* HSW only */
> + I915_OA_FORMAT_C4_B8, /* HSW+ */
> +
> + /* Gen8+ */
> + I915_OA_FORMAT_A12,
> + I915_OA_FORMAT_A12_B8_C8,
> + I915_OA_FORMAT_A32u40_A4u32_B8_C8,
>
> I915_OA_FORMAT_MAX /* non-ABI */
> };
> --
> 2.12.0
>
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