From patchwork Mon Oct 14 20:14:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 11189399 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8CF8D14DB for ; Mon, 14 Oct 2019 20:14:12 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 06C7C21721 for ; Mon, 14 Oct 2019 20:14:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06C7C21721 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=chris-wilson.co.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4AF6A6E49F; Mon, 14 Oct 2019 20:14:10 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6A4466E49F for ; Mon, 14 Oct 2019 20:14:09 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 18836952-1500050 for ; Mon, 14 Oct 2019 21:14:06 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Mon, 14 Oct 2019 21:14:04 +0100 Message-Id: <20191014201404.22468-4-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191014201404.22468-1-chris@chris-wilson.co.uk> References: <20191014201404.22468-1-chris@chris-wilson.co.uk> MIME-Version: 1.0 Subject: [Intel-gfx] [CI 4/4] drm/i915/perf: allow holding preemption on filtered ctx X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Lionel Landwerlin We would like to make use of perf in Vulkan. The Vulkan API is much lower level than OpenGL, with applications directly exposed to the concept of command buffers (pretty much equivalent to our batch buffers). In Vulkan, queries are always limited in scope to a command buffer. In OpenGL, the lack of command buffer concept meant that queries' duration could span multiple command buffers. With that restriction gone in Vulkan, we would like to simplify measuring performance just by measuring the deltas between the counter snapshots written by 2 MI_RECORD_PERF_COUNT commands, rather than the more complex scheme we currently have in the GL driver, using 2 MI_RECORD_PERF_COUNT commands and doing some post processing on the stream of OA reports, coming from the global OA buffer, to remove any unrelated deltas in between the 2 MI_RECORD_PERF_COUNT. Disabling preemption only apply to a single context with which want to query performance counters for and is considered a privileged operation, by default protected by CAP_SYS_ADMIN. It is possible to enable it for a normal user by disabling the paranoid stream setting. v2: Store preemption setting in intel_context (Chris) v3: Use priorities to avoid preemption rather than the HW mechanism v4: Just modify the port priority reporting function v5: Add nopreempt flag on gem context and always flag requests appropriately, regarless of OA reconfiguration. Link: https://gitlab.freedesktop.org/mesa/mesa/merge_requests/932 Signed-off-by: Lionel Landwerlin Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/gem/i915_gem_context.h | 18 ++++++++++ .../gpu/drm/i915/gem/i915_gem_context_types.h | 1 + .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 3 ++ drivers/gpu/drm/i915/i915_perf.c | 34 +++++++++++++++++-- drivers/gpu/drm/i915/i915_perf_types.h | 8 +++++ include/uapi/drm/i915_drm.h | 11 ++++++ 6 files changed, 72 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h index 9234586830d1..cfe80590f0ed 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h @@ -114,6 +114,24 @@ i915_gem_context_clear_user_engines(struct i915_gem_context *ctx) clear_bit(CONTEXT_USER_ENGINES, &ctx->flags); } +static inline bool +i915_gem_context_nopreempt(const struct i915_gem_context *ctx) +{ + return test_bit(CONTEXT_NOPREEMPT, &ctx->flags); +} + +static inline void +i915_gem_context_set_nopreempt(struct i915_gem_context *ctx) +{ + set_bit(CONTEXT_NOPREEMPT, &ctx->flags); +} + +static inline void +i915_gem_context_clear_nopreempt(struct i915_gem_context *ctx) +{ + clear_bit(CONTEXT_NOPREEMPT, &ctx->flags); +} + static inline bool i915_gem_context_is_kernel(struct i915_gem_context *ctx) { return !ctx->file_priv; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h index ab8e1367dfc8..fe97b8ba4fda 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h @@ -146,6 +146,7 @@ struct i915_gem_context { #define CONTEXT_CLOSED 1 #define CONTEXT_FORCE_SINGLE_SUBMISSION 2 #define CONTEXT_USER_ENGINES 3 +#define CONTEXT_NOPREEMPT 4 struct mutex mutex; diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 98816c35ffc3..e96901888323 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -2077,6 +2077,9 @@ static int eb_submit(struct i915_execbuffer *eb) if (err) return err; + if (i915_gem_context_nopreempt(eb->gem_context)) + eb->request->flags |= I915_REQUEST_NOPREEMPT; + return 0; } diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c index 372c91f6a28e..54ec1c4190ac 100644 --- a/drivers/gpu/drm/i915/i915_perf.c +++ b/drivers/gpu/drm/i915/i915_perf.c @@ -344,6 +344,8 @@ static const struct i915_oa_format gen8_plus_oa_formats[I915_OA_FORMAT_MAX] = { * struct perf_open_properties - for validated properties given to open a stream * @sample_flags: `DRM_I915_PERF_PROP_SAMPLE_*` properties are tracked as flags * @single_context: Whether a single or all gpu contexts should be monitored + * @hold_preemption: Whether the preemption is disabled for the filtered + * context * @ctx_handle: A gem ctx handle for use with @single_context * @metrics_set: An ID for an OA unit metric set advertised via sysfs * @oa_format: An OA unit HW report format @@ -359,6 +361,7 @@ struct perf_open_properties { u32 sample_flags; u64 single_context:1; + u64 hold_preemption:1; u64 ctx_handle; /* OA sampling state */ @@ -2514,6 +2517,8 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream, if (WARN_ON(stream->oa_buffer.format_size == 0)) return -EINVAL; + stream->hold_preemption = props->hold_preemption; + stream->oa_buffer.format = perf->oa_formats[props->oa_format].format; @@ -2834,6 +2839,9 @@ static void i915_perf_enable_locked(struct i915_perf_stream *stream) if (stream->ops->enable) stream->ops->enable(stream); + + if (stream->hold_preemption) + i915_gem_context_set_nopreempt(stream->ctx); } /** @@ -2858,6 +2866,9 @@ static void i915_perf_disable_locked(struct i915_perf_stream *stream) /* Allow stream->ops->disable() to refer to this */ stream->enabled = false; + if (stream->hold_preemption) + i915_gem_context_clear_nopreempt(stream->ctx); + if (stream->ops->disable) stream->ops->disable(stream); } @@ -3067,6 +3078,15 @@ i915_perf_open_ioctl_locked(struct i915_perf *perf, } } + if (props->hold_preemption) { + if (!props->single_context) { + DRM_DEBUG("preemption disable with no context\n"); + ret = -EINVAL; + goto err; + } + privileged_op = true; + } + /* * 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 @@ -3081,7 +3101,7 @@ i915_perf_open_ioctl_locked(struct i915_perf *perf, * MI_REPORT_PERF_COUNT commands and so consider it a privileged op to * enable the OA unit by default. */ - if (IS_HASWELL(perf->i915) && specific_ctx) + if (IS_HASWELL(perf->i915) && specific_ctx && !props->hold_preemption) privileged_op = false; /* Similar to perf's kernel.perf_paranoid_cpu sysctl option @@ -3091,7 +3111,7 @@ i915_perf_open_ioctl_locked(struct i915_perf *perf, */ if (privileged_op && i915_perf_stream_paranoid && !capable(CAP_SYS_ADMIN)) { - DRM_DEBUG("Insufficient privileges to open system-wide i915 perf stream\n"); + DRM_DEBUG("Insufficient privileges to open i915 perf stream\n"); ret = -EACCES; goto err_ctx; } @@ -3293,6 +3313,9 @@ static int read_properties_unlocked(struct i915_perf *perf, props->oa_periodic = true; props->oa_period_exponent = value; break; + case DRM_I915_PERF_PROP_HOLD_PREEMPTION: + props->hold_preemption = !!value; + break; case DRM_I915_PERF_PROP_MAX: MISSING_CASE(id); return -EINVAL; @@ -4066,8 +4089,13 @@ int i915_perf_ioctl_version(void) * * 2: Added runtime modification of OA config. * I915_PERF_IOCTL_CONFIG + * + * 3: Add DRM_I915_PERF_PROP_HOLD_PREEMPTION parameter to hold + * preemption on a particular context so that performance data is + * accessible from a delta of MI_RPC reports without looking at the + * OA buffer. */ - return 2; + return 3; } #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h index d35a3c1946c3..a1f733fc905a 100644 --- a/drivers/gpu/drm/i915/i915_perf_types.h +++ b/drivers/gpu/drm/i915/i915_perf_types.h @@ -170,6 +170,14 @@ struct i915_perf_stream { */ bool enabled; + /** + * @hold_preemption: Whether preemption is put on hold for command + * submissions done on the @ctx. This is useful for some drivers that + * cannot easily post process the OA buffer context to subtract delta + * of performance counters not associated with @ctx. + */ + bool hold_preemption; + /** * @ops: The callbacks providing the implementation of this specific * type of configured stream. diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index b008ce8b4e6f..63d40cba97e0 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -1890,6 +1890,17 @@ enum drm_i915_perf_property_id { */ DRM_I915_PERF_PROP_OA_EXPONENT, + /** + * Specifying this property is only valid when specify a context to + * filter with DRM_I915_PERF_PROP_CTX_HANDLE. Specifying this property + * will hold preemption of the particular context we want to gather + * performance data about. The execbuf2 submissions must include a + * drm_i915_gem_execbuffer_ext_perf parameter for this to apply. + * + * This property is available in perf revision 3. + */ + DRM_I915_PERF_PROP_HOLD_PREEMPTION, + DRM_I915_PERF_PROP_MAX /* non-ABI */ };