From patchwork Sat Jul 18 00:04:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Umesh Nerlige Ramappa X-Patchwork-Id: 11671483 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 2F9DB6C1 for ; Sat, 18 Jul 2020 00:04:49 +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 185D420759 for ; Sat, 18 Jul 2020 00:04:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 185D420759 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 6E1F46E2F3; Sat, 18 Jul 2020 00:04:47 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by gabe.freedesktop.org (Postfix) with ESMTPS id 31E596E2CC for ; Sat, 18 Jul 2020 00:04:43 +0000 (UTC) IronPort-SDR: wx3J2ZOPbe3P3IF2MeKdrOv4Pa5w2BzN7Lh5GSeVaO2rms7J7PPV35yv4JwDDNipdEGUee54yt O534c98aPKqA== X-IronPort-AV: E=McAfee;i="6000,8403,9685"; a="129778162" X-IronPort-AV: E=Sophos;i="5.75,364,1589266800"; d="scan'208";a="129778162" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 17:04:42 -0700 IronPort-SDR: g8TVFD0AN0pEbYtu/p9CwQr5p/v9aR+fyNDULHFvmKBqWrlhIeX4nOzyXtUthEwaTVKJiPGTaY kZcmfu20Ej0Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,364,1589266800"; d="scan'208";a="270941291" Received: from orsosgc001.ra.intel.com ([10.23.184.150]) by fmsmga008.fm.intel.com with ESMTP; 17 Jul 2020 17:04:38 -0700 From: Umesh Nerlige Ramappa To: intel-gfx@lists.freedesktop.org Date: Fri, 17 Jul 2020 17:04:37 -0700 Message-Id: <20200718000437.69033-5-umesh.nerlige.ramappa@intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200718000437.69033-1-umesh.nerlige.ramappa@intel.com> References: <20200718000437.69033-1-umesh.nerlige.ramappa@intel.com> MIME-Version: 1.0 Subject: [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: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" 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) Signed-off-by: Piotr Maciejewski Signed-off-by: Umesh Nerlige Ramappa Reported-by: kernel test robot --- 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 | 147 ++++++++++++++++++++++- drivers/gpu/drm/i915/i915_perf_types.h | 5 + include/uapi/drm/i915_drm.h | 32 +++++ 5 files changed, 186 insertions(+), 2 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 15f31c250ca9..e77582761a64 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" @@ -434,6 +436,30 @@ 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 @@ -3209,6 +3235,59 @@ 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 (!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 (!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 @@ -3234,6 +3313,10 @@ 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; @@ -3315,6 +3398,60 @@ static int i915_perf_release(struct inode *inode, struct file *file) return 0; } +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 drm_i915_gem_object *obj = stream->oa_buffer.vma->obj; + int err; + + 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 = { + .fault = vm_fault_oa, +}; + +int i915_perf_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct i915_perf_stream *stream = file->private_data; + int len; + + if (!IS_ALIGNED(vma->vm_start, PAGE_SIZE)) + return -EINVAL; + + if (vma->vm_end < vma->vm_start) + return -EINVAL; + + len = vma->vm_end - vma->vm_start; + if (!IS_ALIGNED(len, PAGE_SIZE) || len > OA_BUFFER_SIZE) + return -EINVAL; + + if (vma->vm_flags & VM_WRITE) + return -EINVAL; + + if (vma->vm_pgoff != I915_PERF_OA_BUFFER_MMAP_OFFSET) + 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; + + return 0; +} static const struct file_operations fops = { .owner = THIS_MODULE, @@ -3327,6 +3464,7 @@ static const struct file_operations fops = { * to handle 32bits compatibility. */ .compat_ioctl = i915_perf_ioctl, + .mmap = i915_perf_mmap, }; @@ -4255,6 +4393,7 @@ 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)) { @@ -4286,6 +4425,7 @@ 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; @@ -4313,6 +4453,7 @@ 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; @@ -4337,6 +4478,7 @@ 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; @@ -4448,8 +4590,11 @@ int i915_perf_ioctl_version(void) * * 7: Whitelist OA buffer head/tail registers for user to identify the * location of triggered reports into the OA buffer. + * + * 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..579f34e6fdd8 100644 --- a/drivers/gpu/drm/i915/i915_perf_types.h +++ b/drivers/gpu/drm/i915/i915_perf_types.h @@ -377,6 +377,11 @@ 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 */