From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D70FC433E0 for ; Thu, 23 Jul 2020 23:48:43 +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 E079D207C4 for ; Thu, 23 Jul 2020 23:48:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E079D207C4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com 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 66C776E2CA; Thu, 23 Jul 2020 23:48:42 +0000 (UTC) Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id C1C326E51D for ; Thu, 23 Jul 2020 23:48:41 +0000 (UTC) IronPort-SDR: ACmpAr16W0t0wAy9zqqoShc/awwWL98GIrXeqwjdRf0IFskp7929YiA+asVyE3/F35mU7bB7dC 3SX7K/2ZP84A== X-IronPort-AV: E=McAfee;i="6000,8403,9691"; a="138136212" X-IronPort-AV: E=Sophos;i="5.75,388,1589266800"; d="scan'208";a="138136212" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jul 2020 16:48:41 -0700 IronPort-SDR: wpW28Z5704uD4PZSaGkXWN9KDhl4cdPOM8dAC7n3E/DpunKM1WlIbU/oBh2iRNL4SDoyoroPhw LLBbtSYoCHsA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,388,1589266800"; d="scan'208";a="328742564" Received: from orsosgc001.ra.intel.com (HELO orsosgc001.amr.corp.intel.com) ([10.23.184.150]) by orsmga007.jf.intel.com with ESMTP; 23 Jul 2020 16:48:41 -0700 Date: Thu, 23 Jul 2020 16:48:40 -0700 From: Umesh Nerlige Ramappa To: Lionel Landwerlin Message-ID: <20200723234840.GA28353@orsosgc001.amr.corp.intel.com> References: <20200722055518.44028-1-umesh.nerlige.ramappa@intel.com> <20200722055518.44028-5-umesh.nerlige.ramappa@intel.com> <03dbef8e-a469-8dd8-70d8-47a993a30fa1@intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <03dbef8e-a469-8dd8-70d8-47a993a30fa1@intel.com> User-Agent: Mutt/1.12.1 (2019-06-15) Subject: Re: [Intel-gfx] [PATCH 4/4] drm/i915/perf: Map OA buffer to user space for gen12 performance query X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, Chris Wilson Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" On Thu, Jul 23, 2020 at 12:31:30PM +0300, Lionel Landwerlin wrote: >On 22/07/2020 08:55, Umesh Nerlige Ramappa wrote: >>From: Piotr Maciejewski >> >>i915 used to support time based sampling mode which is good for overall >>system monitoring, but is not enough for query mode used to measure a >>single draw call or dispatch. Gen9-Gen11 are using current i915 perf >>implementation for query, but Gen12+ requires a new approach for query >>based on triggered reports within oa buffer. >> >>Triggering reports into the OA buffer is achieved by writing into a >>a trigger register. Optionally an unused counter/register is set with a >>marker value such that a triggered report can be identified in the OA >>buffer. Reports are usually triggered at the start and end of work that >>is measured. >> >>Since OA buffer is large and queries can be frequent, an efficient way >>to look for triggered reports is required. By knowing the current head >>and tail offsets into the OA buffer, it is easier to determine the >>locality of the reports of interest. >> >>Current perf OA interface does not expose head/tail information to the >>user and it filters out invalid reports before sending data to user. >>Also considering limited size of user buffer used during a query, >>creating a 1:1 copy of the OA buffer at the user space added undesired >>complexity. >> >>The solution was to map the OA buffer to user space provided >> >>(1) that it is accessed from a privileged user. >>(2) OA report filtering is not used. >> >>These 2 conditions would satisfy the safety criteria that the current >>perf interface addresses. >> >>To enable the query: >>- Add an ioctl to expose head and tail to the user >>- Add an ioctl to return size and offset of the OA buffer >>- Map the OA buffer to the user space >> >>v2: >>- Improve commit message (Chris) >>- Do not mmap based on gem object filp. Instead, use perf_fd and support >> mmap syscall (Chris) >>- Pass non-zero offset in mmap to enforce the right object is >> mapped (Chris) >>- Do not expose gpu_address (Chris) >>- Verify start and length of vma for page alignment (Lionel) >>- Move SQNTL config out (Lionel) >> >>v3: (Chris) >>- Omit redundant checks >>- Return VM_FAULT_SIGBUS is old stream is closed >>- Maintain reference counts to stream in vm_open and vm_close >>- Use switch to identify object to be mapped >> >>v4: Call kref_put on closing perf fd (Chris) >> >>Signed-off-by: Piotr Maciejewski >>Signed-off-by: Umesh Nerlige Ramappa >>--- >> drivers/gpu/drm/i915/gem/i915_gem_mman.c | 2 +- >> drivers/gpu/drm/i915/gem/i915_gem_mman.h | 2 + >> drivers/gpu/drm/i915/i915_perf.c | 211 ++++++++++++++++++++++- >> drivers/gpu/drm/i915/i915_perf_types.h | 17 ++ >> include/uapi/drm/i915_drm.h | 32 ++++ >> 5 files changed, 261 insertions(+), 3 deletions(-) >> >>diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c >>index b23368529a40..7c4b9b0c334b 100644 >>--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c >>+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c >>@@ -204,7 +204,7 @@ compute_partial_view(const struct drm_i915_gem_object *obj, >> return view; >> } >>-static vm_fault_t i915_error_to_vmf_fault(int err) >>+vm_fault_t i915_error_to_vmf_fault(int err) >> { >> switch (err) { >> default: >>diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.h b/drivers/gpu/drm/i915/gem/i915_gem_mman.h >>index efee9e0d2508..1190a3a228ea 100644 >>--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.h >>+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.h >>@@ -29,4 +29,6 @@ void i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj); >> void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj); >>+vm_fault_t i915_error_to_vmf_fault(int err); >>+ >> #endif >>diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c >>index 2f23aad12c60..331c3f9c59e2 100644 >>--- a/drivers/gpu/drm/i915/i915_perf.c >>+++ b/drivers/gpu/drm/i915/i915_perf.c >>@@ -192,10 +192,12 @@ >> */ >> #include >>+#include >> #include >> #include >> #include "gem/i915_gem_context.h" >>+#include "gem/i915_gem_mman.h" >> #include "gt/intel_engine_pm.h" >> #include "gt/intel_engine_user.h" >> #include "gt/intel_gt.h" >>@@ -378,6 +380,24 @@ static struct ctl_table_header *sysctl_header; >> static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer); >>+static void free_stream(struct kref *kref) >>+{ >>+ struct i915_perf_stream *stream = >>+ container_of(kref, typeof(*stream), refcount); >>+ >>+ kfree(stream); >>+} >>+ >>+static void perf_stream_get(struct i915_perf_stream *stream) >>+{ >>+ kref_get(&stream->refcount); >>+} >>+ >>+static void perf_stream_put(struct i915_perf_stream *stream) >>+{ >>+ kref_put(&stream->refcount, free_stream); >>+} >>+ >> void i915_oa_config_release(struct kref *ref) >> { >> struct i915_oa_config *oa_config = >>@@ -434,6 +454,30 @@ static u32 gen7_oa_hw_tail_read(struct i915_perf_stream *stream) >> return oastatus1 & GEN7_OASTATUS1_TAIL_MASK; >> } >>+static u32 gen12_oa_hw_head_read(struct i915_perf_stream *stream) >>+{ >>+ struct intel_uncore *uncore = stream->uncore; >>+ >>+ return intel_uncore_read(uncore, GEN12_OAG_OAHEADPTR) & >>+ GEN12_OAG_OAHEADPTR_MASK; >>+} >>+ >>+static u32 gen8_oa_hw_head_read(struct i915_perf_stream *stream) >>+{ >>+ struct intel_uncore *uncore = stream->uncore; >>+ >>+ return intel_uncore_read(uncore, GEN8_OAHEADPTR) & >>+ GEN8_OAHEADPTR_MASK; >>+} >>+ >>+static u32 gen7_oa_hw_head_read(struct i915_perf_stream *stream) >>+{ >>+ struct intel_uncore *uncore = stream->uncore; >>+ u32 oastatus2 = intel_uncore_read(uncore, GEN7_OASTATUS2); >>+ >>+ return oastatus2 & GEN7_OASTATUS2_HEAD_MASK; >>+} >>+ >> /** >> * oa_buffer_check_unlocked - check for data and update tail ptr state >> * @stream: i915 stream instance >>@@ -2934,6 +2978,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream, >> stream->poll_check_timer.function = oa_poll_check_timer_cb; >> init_waitqueue_head(&stream->poll_wq); >> spin_lock_init(&stream->oa_buffer.ptr_lock); >>+ kref_init(&stream->refcount); >> return 0; >>@@ -3214,6 +3259,69 @@ static long i915_perf_config_locked(struct i915_perf_stream *stream, >> return ret; >> } >>+/** >>+ * i915_perf_oa_buffer_head_tail_locked - head and tail of the OA buffer >>+ * @stream: i915 perf stream >>+ * @arg: pointer to oa buffer head and tail filled by this function. >>+ */ >>+static int i915_perf_oa_buffer_head_tail_locked(struct i915_perf_stream *stream, >>+ unsigned long arg) >>+{ >>+ struct drm_i915_perf_oa_buffer_head_tail ht; >>+ void __user *output = (void __user *)arg; >>+ u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); >>+ >>+ if (i915_perf_stream_paranoid && !perfmon_capable()) { >>+ DRM_DEBUG("Insufficient privileges to access OA buffer info\n"); >>+ return -EACCES; >>+ } >>+ >>+ if (!output) >>+ return -EINVAL; >>+ >>+ memset(&ht, 0, sizeof(ht)); >>+ >>+ ht.head = stream->perf->ops.oa_hw_head_read(stream) - gtt_offset; >>+ ht.tail = stream->perf->ops.oa_hw_tail_read(stream) - gtt_offset; >>+ >>+ if (copy_to_user(output, &ht, sizeof(ht))) >>+ return -EFAULT; >>+ >>+ return 0; >>+} >>+ >>+#define I915_PERF_OA_BUFFER_MMAP_OFFSET 1 >>+ >>+/** >>+ * i915_perf_oa_buffer_info_locked - size and offset of the OA buffer >>+ * @stream: i915 perf stream >>+ * @arg: pointer to oa buffer info filled by this function. >>+ */ >>+static int i915_perf_oa_buffer_info_locked(struct i915_perf_stream *stream, >>+ unsigned long arg) >>+{ >>+ struct drm_i915_perf_oa_buffer_info info; >>+ void __user *output = (void __user *)arg; >>+ >>+ if (i915_perf_stream_paranoid && !perfmon_capable()) { >>+ DRM_DEBUG("Insufficient privileges to access OA buffer info\n"); >>+ return -EACCES; >>+ } >>+ >>+ if (!output) >>+ return -EINVAL; >>+ >>+ memset(&info, 0, sizeof(info)); >>+ >>+ info.size = stream->oa_buffer.vma->size; >>+ info.offset = I915_PERF_OA_BUFFER_MMAP_OFFSET * PAGE_SIZE; >>+ >>+ if (copy_to_user(output, &info, sizeof(info))) >>+ return -EFAULT; >>+ >>+ return 0; >>+} >>+ >> /** >> * i915_perf_ioctl - support ioctl() usage with i915 perf stream FDs >> * @stream: An i915 perf stream >>@@ -3239,6 +3347,10 @@ static long i915_perf_ioctl_locked(struct i915_perf_stream *stream, >> return 0; >> case I915_PERF_IOCTL_CONFIG: >> return i915_perf_config_locked(stream, arg); >>+ case I915_PERF_IOCTL_GET_OA_BUFFER_INFO: >>+ return i915_perf_oa_buffer_info_locked(stream, arg); >>+ case I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL: >>+ return i915_perf_oa_buffer_head_tail_locked(stream, arg); >> } >> return -EINVAL; >>@@ -3291,7 +3403,8 @@ static void i915_perf_destroy_locked(struct i915_perf_stream *stream) >> if (stream->ctx) >> i915_gem_context_put(stream->ctx); >>- kfree(stream); >>+ WRITE_ONCE(stream->closed, true); >>+ perf_stream_put(stream); >> } >> /** >>@@ -3314,12 +3427,98 @@ static int i915_perf_release(struct inode *inode, struct file *file) >> i915_perf_destroy_locked(stream); >> mutex_unlock(&perf->lock); >>+ unmap_mapping_range(file->f_mapping, 0, OA_BUFFER_SIZE, 1); >>+ >> /* Release the reference the perf stream kept on the driver. */ >> drm_dev_put(&perf->i915->drm); >> return 0; >> } >>+static void vm_open_oa(struct vm_area_struct *vma) >>+{ >>+ struct i915_perf_stream *stream = vma->vm_private_data; >>+ >>+ GEM_BUG_ON(!stream); >>+ perf_stream_get(stream); >>+} >>+ >>+static void vm_close_oa(struct vm_area_struct *vma) >>+{ >>+ struct i915_perf_stream *stream = vma->vm_private_data; >>+ >>+ GEM_BUG_ON(!stream); >>+ perf_stream_put(stream); >>+} >>+ >>+static vm_fault_t vm_fault_oa(struct vm_fault *vmf) >>+{ >>+ struct vm_area_struct *vma = vmf->vma; >>+ struct i915_perf_stream *stream = vma->vm_private_data; >>+ struct i915_perf *perf = stream->perf; >>+ struct drm_i915_gem_object *obj = stream->oa_buffer.vma->obj; > >I could be wrong because I'm not that knowledgeable on memory mapping stuff. > >But it seems if close() is called on the i915-perf stream before this >function is called. stream->oa_buffer.vma might be NULL/freed. > > >It seems like we need an additional reference on the >stream->oa_buffer.vma->obj taken within the perf->lock in this >function. If you notice the stream->oa_buffer.vaddr is NULL inside the >lock, it means a close() call won the race with the mmap() and you >should return VM_FAULT_SIGBUS. > >We should drop that reference taken on stream->oa_buffer.vma->obj when >the memory is unmapped. > Based on trying to trigger a SIGBUS with igt, this is what I found: do_mmap (somewhere in mmap_region) takes a reference to the file. If oa buffer is mapped successfully, close(perf_fd) does not call i915_perf_release, but close(perf_fd) followed by unmap() or vice-versa will end up calling i915_perf_release. forking did not help either because fork itself takes a reference to the perf_fd. Once unmap is called, the vma should be gone anyways, so I don't expect the kernel to call vm_fault. I would say the kernel is really smart and wouldn't let it happen :), but maybe Chris can confirm. Thanks, Umesh > >Maybe Chris can confirm if that sounds correct. > > >-Lionel > > >>+ int err; >>+ bool closed; >>+ >>+ mutex_lock(&perf->lock); >>+ closed = READ_ONCE(stream->closed); >>+ mutex_unlock(&perf->lock); >>+ >>+ if (closed) >>+ return VM_FAULT_SIGBUS; >>+ >>+ err = i915_gem_object_pin_pages(obj); >>+ if (err) >>+ goto out; >>+ >>+ err = remap_io_sg(vma, >>+ vma->vm_start, vma->vm_end - vma->vm_start, >>+ obj->mm.pages->sgl, -1); >>+ >>+ i915_gem_object_unpin_pages(obj); >>+ >>+out: >>+ return i915_error_to_vmf_fault(err); >>+} >>+ >>+static const struct vm_operations_struct vm_ops_oa = { >>+ .open = vm_open_oa, >>+ .close = vm_close_oa, >>+ .fault = vm_fault_oa, >>+}; >>+ >>+int i915_perf_mmap(struct file *file, struct vm_area_struct *vma) >>+{ >>+ struct i915_perf_stream *stream = file->private_data; >>+ >>+ if (i915_perf_stream_paranoid && !perfmon_capable()) { >>+ DRM_DEBUG("Insufficient privileges to map OA buffer\n"); >>+ return -EACCES; >>+ } >>+ >>+ switch (vma->vm_pgoff) { >>+ case I915_PERF_OA_BUFFER_MMAP_OFFSET: >>+ if (vma->vm_end - vma->vm_start > OA_BUFFER_SIZE) >>+ return -EINVAL; >>+ >>+ if (vma->vm_flags & VM_WRITE) >>+ return -EINVAL; >>+ >>+ break; >>+ >>+ default: >>+ return -EINVAL; >>+ } >>+ >>+ vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC | VM_MAYSHARE); >>+ vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; >>+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); >>+ vma->vm_private_data = stream; >>+ vma->vm_ops = &vm_ops_oa; >>+ vm_open_oa(vma); >>+ >>+ return 0; >>+} >> static const struct file_operations fops = { >> .owner = THIS_MODULE, >>@@ -3332,6 +3531,7 @@ static const struct file_operations fops = { >> * to handle 32bits compatibility. >> */ >> .compat_ioctl = i915_perf_ioctl, >>+ .mmap = i915_perf_mmap, >> }; >>@@ -4260,6 +4460,7 @@ void i915_perf_init(struct drm_i915_private *i915) >> perf->ops.oa_disable = gen7_oa_disable; >> perf->ops.read = gen7_oa_read; >> perf->ops.oa_hw_tail_read = gen7_oa_hw_tail_read; >>+ perf->ops.oa_hw_head_read = gen7_oa_hw_head_read; >> perf->oa_formats = hsw_oa_formats; >> } else if (HAS_LOGICAL_RING_CONTEXTS(i915)) { >>@@ -4291,6 +4492,7 @@ void i915_perf_init(struct drm_i915_private *i915) >> perf->ops.enable_metric_set = gen8_enable_metric_set; >> perf->ops.disable_metric_set = gen8_disable_metric_set; >> perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read; >>+ perf->ops.oa_hw_head_read = gen8_oa_hw_head_read; >> if (IS_GEN(i915, 8)) { >> perf->ctx_oactxctrl_offset = 0x120; >>@@ -4318,6 +4520,7 @@ void i915_perf_init(struct drm_i915_private *i915) >> perf->ops.enable_metric_set = gen8_enable_metric_set; >> perf->ops.disable_metric_set = gen10_disable_metric_set; >> perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read; >>+ perf->ops.oa_hw_head_read = gen8_oa_hw_head_read; >> if (IS_GEN(i915, 10)) { >> perf->ctx_oactxctrl_offset = 0x128; >>@@ -4342,6 +4545,7 @@ void i915_perf_init(struct drm_i915_private *i915) >> perf->ops.enable_metric_set = gen12_enable_metric_set; >> perf->ops.disable_metric_set = gen12_disable_metric_set; >> perf->ops.oa_hw_tail_read = gen12_oa_hw_tail_read; >>+ perf->ops.oa_hw_head_read = gen12_oa_hw_head_read; >> perf->ctx_flexeu0_offset = 0; >> perf->ctx_oactxctrl_offset = 0x144; >>@@ -4456,8 +4660,11 @@ int i915_perf_ioctl_version(void) >> * >> * - OA buffer head/tail/status/buffer registers for read only >> * - OA counters A18, A19, A20 for read/write >>+ * >>+ * 8: Added an option to map oa buffer at umd driver level and trigger >>+ * oa reports within oa buffer from command buffer. >> */ >>- return 7; >>+ return 8; >> } >> #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 a36a455ae336..2efbe35c5fa9 100644 >>--- a/drivers/gpu/drm/i915/i915_perf_types.h >>+++ b/drivers/gpu/drm/i915/i915_perf_types.h >>@@ -311,6 +311,18 @@ struct i915_perf_stream { >> * buffer should be checked for available data. >> */ >> u64 poll_oa_period; >>+ >>+ /** >>+ * @closed: Open or closed state of the stream. >>+ * True if stream is closed. >>+ */ >>+ bool closed; >>+ >>+ /** >>+ * @refcount: References to the mapped OA buffer managed by this >>+ * stream. >>+ */ >>+ struct kref refcount; >> }; >> /** >>@@ -377,6 +389,11 @@ struct i915_oa_ops { >> * generations. >> */ >> u32 (*oa_hw_tail_read)(struct i915_perf_stream *stream); >>+ >>+ /** >>+ * @oa_hw_head_read: read the OA head pointer register >>+ */ >>+ u32 (*oa_hw_head_read)(struct i915_perf_stream *stream); >> }; >> struct i915_perf { >>diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h >>index 00546062e023..2042f6339182 100644 >>--- a/include/uapi/drm/i915_drm.h >>+++ b/include/uapi/drm/i915_drm.h >>@@ -2048,6 +2048,38 @@ struct drm_i915_perf_open_param { >> */ >> #define I915_PERF_IOCTL_CONFIG _IO('i', 0x2) >>+/** >>+ * Returns OA buffer properties to be used with mmap. >>+ * >>+ * This ioctl is available in perf revision 8. >>+ */ >>+#define I915_PERF_IOCTL_GET_OA_BUFFER_INFO _IO('i', 0x3) >>+ >>+/** >>+ * OA buffer size and offset. >>+ */ >>+struct drm_i915_perf_oa_buffer_info { >>+ __u32 size; >>+ __u32 offset; >>+ __u64 reserved[4]; >>+}; >>+ >>+/** >>+ * Returns current position of OA buffer head and tail. >>+ * >>+ * This ioctl is available in perf revision 8. >>+ */ >>+#define I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL _IO('i', 0x4) >>+ >>+/** >>+ * OA buffer head and tail. >>+ */ >>+struct drm_i915_perf_oa_buffer_head_tail { >>+ __u32 head; >>+ __u32 tail; >>+ __u64 reserved[4]; >>+}; >>+ >> /** >> * Common to all i915 perf records >> */ > > _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx