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practices: Add checks for images and buffers
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This commit adds checks regarding:
 - Store ops for potentially transient images
 - Framebuffer attachments that should/should not be transient
 - Clearing attachments after load
 - Many instanced vertex buffers in a pipeline

This corresponds to checks KhronosGroup#8, KhronosGroup#10-11, KhronosGroup#14 and KhronosGroup#32 from PerfDoc.
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@AttilioProvenzano-ARM
AttilioProvenzano-ARM committed Feb 27, 2020
1 parent 38f68cc commit ccd77aa
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Showing 3 changed files with 172 additions and 0 deletions.
157 changes: 157 additions & 0 deletions layers/best_practices.cpp
View file
Original file line number Diff line number Diff line change
Expand Up @@ -218,6 +218,26 @@ bool BestPractices::PreCallValidateCreateRenderPass(VkDevice device, const VkRen
"image truely is undefined at the start of the render pass.");
}
}

const auto& attachment = pCreateInfo->pAttachments[i];
if (attachment.samples > VK_SAMPLE_COUNT_1_BIT) {
bool access_requires_memory =
attachment.loadOp == VK_ATTACHMENT_LOAD_OP_LOAD || attachment.storeOp == VK_ATTACHMENT_STORE_OP_STORE;

if (FormatHasStencil(format)) {
access_requires_memory |= attachment.stencilLoadOp == VK_ATTACHMENT_LOAD_OP_LOAD ||
attachment.stencilStoreOp == VK_ATTACHMENT_STORE_OP_STORE;
}

if (access_requires_memory) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_CreateRenderPass_ImageRequiresMemory,
"Attachment %u in the VkRenderPass is a multisampled image with %u samples, but it uses loadOp/storeOp "
"which requires accessing data from memory. Multisampled images should always be loadOp = CLEAR or DONT_CARE, "
"storeOp = DONT_CARE. This allows the implementation to use lazily allocated memory effectively.",
i, static_cast<uint32_t>(attachment.samples));
}
}
}

for (uint32_t dependency = 0; dependency < pCreateInfo->dependencyCount; dependency++) {
Expand All @@ -228,6 +248,67 @@ bool BestPractices::PreCallValidateCreateRenderPass(VkDevice device, const VkRen
return skip;
}

bool BestPractices::PreCallValidateCreateFramebuffer(VkDevice device, const VkFramebufferCreateInfo* pCreateInfo,
const VkAllocationCallbacks* pAllocator, VkFramebuffer* pFramebuffer) const {
bool skip = false;

// Check for non-transient attachments that should be transient and vice versa
auto rp_state = GetRenderPassState(pCreateInfo->renderPass);
if (rp_state) {
const VkRenderPassCreateInfo2* rpci = rp_state->createInfo.ptr();
const VkImageView* image_views = pCreateInfo->pAttachments;

for (uint32_t i = 0; i < pCreateInfo->attachmentCount; ++i) {
auto& attachment = rpci->pAttachments[i];
bool attachment_should_be_transient =
(attachment.loadOp != VK_ATTACHMENT_LOAD_OP_LOAD && attachment.storeOp != VK_ATTACHMENT_STORE_OP_STORE);

if (FormatHasStencil(attachment.format)) {
attachment_should_be_transient &= (attachment.stencilLoadOp != VK_ATTACHMENT_LOAD_OP_LOAD &&
attachment.stencilStoreOp != VK_ATTACHMENT_STORE_OP_STORE);
}

auto view_state = GetImageViewState(image_views[i]);
if (view_state) {
auto& ivci = view_state->create_info;
auto& ici = GetImageState(ivci.image)->createInfo;

bool image_is_transient = ici.usage & VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT;

// The check for an image that should not be transient applies to all GPUs
if (!attachment_should_be_transient && image_is_transient) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_CreateFramebuffer_AttachmentShouldNotBeTransient,
"Attachment %u in VkFramebuffer uses loadOp/storeOps which need to access physical memory, "
"but the image backing the image view has VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT set. "
"Physical memory will need to be backed lazily to this image, potentially causing stalls.",
i);
}

bool supports_lazy = false;
for (uint32_t j = 0; j < phys_dev_mem_props.memoryTypeCount; j++) {
if (phys_dev_mem_props.memoryTypes[j].propertyFlags & VK_MEMORY_PROPERTY_LAZILY_ALLOCATED_BIT) {
supports_lazy = true;
}
}

// The check for an image that should be transient only applies to GPUs supporting
// lazily allocated memory
if (supports_lazy && attachment_should_be_transient && !image_is_transient) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_CreateFramebuffer_AttachmentShouldBeTransient,
"Attachment %u in VkFramebuffer uses loadOp/storeOps which never have to be backed by physical memory, "
"but the image backing the image view does not have VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT set. "
"You can save physical memory by using transient attachment backed by lazily allocated memory here.",
i);
}
}
}
}

return skip;
}

bool BestPractices::PreCallValidateAllocateMemory(VkDevice device, const VkMemoryAllocateInfo* pAllocateInfo,
const VkAllocationCallbacks* pAllocator, VkDeviceMemory* pMemory) const {
bool skip = false;
Expand Down Expand Up @@ -385,6 +466,26 @@ bool BestPractices::PreCallValidateCreateGraphicsPipelines(VkDevice device, VkPi
"pipeline cache, which may help with performance");
}

for (uint32_t i = 0; i < createInfoCount; i++) {
auto& createInfo = pCreateInfos[i];

auto& vertexInput = *createInfo.pVertexInputState;
uint32_t count = 0;
for (uint32_t j = 0; j < vertexInput.vertexBindingDescriptionCount; j++) {
if (vertexInput.pVertexBindingDescriptions[j].inputRate == VK_VERTEX_INPUT_RATE_INSTANCE) {
count++;
}
}

if (count > kMaxInstancedVertexBuffers) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_CreatePipelines_TooManyInstancedVertexBuffers,
"The pipeline is using %u instanced vertex buffers (current limit: %u), but this can be inefficient on the "
"GPU. If using instanced vertex attributes prefer interleaving them in a single buffer.",
count, kMaxInstancedVertexBuffers);
}
}

return skip;
}

Expand Down Expand Up @@ -872,5 +973,61 @@ bool BestPractices::PreCallValidateCmdClearAttachments(VkCommandBuffer commandBu
report_data->FormatHandle(commandBuffer).c_str());
}

// Check for uses of ClearAttachments along with LOAD_OP_LOAD,
// as it can be more efficient to just use LOAD_OP_CLEAR
const RENDER_PASS_STATE* rp = cb_node->activeRenderPass;
if (rp) {
const auto& subpass = rp->createInfo.pSubpasses[cb_node->activeSubpass];

for (uint32_t i = 0; i < attachmentCount; i++) {
auto& attachment = pAttachments[i];
if (attachment.aspectMask & VK_IMAGE_ASPECT_COLOR_BIT) {
uint32_t color_attachment = attachment.colorAttachment;
uint32_t fb_attachment = subpass.pColorAttachments[color_attachment].attachment;

if (fb_attachment != VK_ATTACHMENT_UNUSED) {
if (rp->createInfo.pAttachments[fb_attachment].loadOp == VK_ATTACHMENT_LOAD_OP_LOAD) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_ClearAttachments_ClearAfterLoad,
"vkCmdClearAttachments() issued on %s for color attachment #%u in this subpass, "
"but LOAD_OP_LOAD was used. If you need to clear the framebuffer, always use LOAD_OP_CLEAR as "
"it is more efficient.",
report_data->FormatHandle(commandBuffer).c_str(), color_attachment);
}
}
}

if (subpass.pDepthStencilAttachment && attachment.aspectMask & VK_IMAGE_ASPECT_DEPTH_BIT) {
uint32_t fb_attachment = subpass.pDepthStencilAttachment->attachment;

if (fb_attachment != VK_ATTACHMENT_UNUSED) {
if (rp->createInfo.pAttachments[fb_attachment].loadOp == VK_ATTACHMENT_LOAD_OP_LOAD) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_ClearAttachments_ClearAfterLoad,
"vkCmdClearAttachments() issued on %s for the depth attachment in this subpass, "
"but LOAD_OP_LOAD was used. If you need to clear the framebuffer, always use LOAD_OP_CLEAR as "
"it is more efficient.",
report_data->FormatHandle(commandBuffer).c_str());
}
}
}

if (subpass.pDepthStencilAttachment && attachment.aspectMask & VK_IMAGE_ASPECT_STENCIL_BIT) {
uint32_t fb_attachment = subpass.pDepthStencilAttachment->attachment;

if (fb_attachment != VK_ATTACHMENT_UNUSED) {
if (rp->createInfo.pAttachments[fb_attachment].stencilLoadOp == VK_ATTACHMENT_LOAD_OP_LOAD) {
skip |= LogPerformanceWarning(
device, kVUID_BestPractices_ClearAttachments_ClearAfterLoad,
"vkCmdClearAttachments() issued on %s for the stencil attachment in this subpass, "
"but LOAD_OP_LOAD was used. If you need to clear the framebuffer, always use LOAD_OP_CLEAR as "
"it is more efficient.",
report_data->FormatHandle(commandBuffer).c_str());
}
}
}
}
}

return skip;
}
5 changes: 5 additions & 0 deletions layers/best_practices.h
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,9 @@

static const uint32_t kMemoryObjectWarningLimit = 250;

// Maximum number of instanced vertex buffers which should be used
static const uint32_t kMaxInstancedVertexBuffers = 1;

// Add this extension after tests are moved to utils: VK_EXT_DEBUG_REPORT_EXTENSION_NAME,
static const std::set<std::string> kDeprecatedExtensionNames = {
VK_KHR_16BIT_STORAGE_EXTENSION_NAME,
Expand Down Expand Up @@ -124,6 +127,8 @@ class BestPractices : public ValidationStateTracker {
const VkAllocationCallbacks* pAllocator, VkSwapchainKHR* pSwapchains) const;
bool PreCallValidateCreateRenderPass(VkDevice device, const VkRenderPassCreateInfo* pCreateInfo,
const VkAllocationCallbacks* pAllocator, VkRenderPass* pRenderPass) const;
bool PreCallValidateCreateFramebuffer(VkDevice device, const VkFramebufferCreateInfo* pCreateInfo,
const VkAllocationCallbacks* pAllocator, VkFramebuffer* pFramebuffer) const;
bool PreCallValidateAllocateMemory(VkDevice device, const VkMemoryAllocateInfo* pAllocateInfo,
const VkAllocationCallbacks* pAllocator, VkDeviceMemory* pMemory) const;
void PostCallRecordAllocateMemory(VkDevice device, const VkMemoryAllocateInfo* pAllocateInfo,
Expand Down
10 changes: 10 additions & 0 deletions layers/best_practices_error_enums.h
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Original file line number Diff line number Diff line change
Expand Up @@ -68,5 +68,15 @@ static const char DECORATE_UNUSED *kVUID_BestPractices_DrawState_VtxIndexOutOfBo
"UNASSIGNED-BestPractices-DrawState-VtxIndexOutOfBounds";
static const char DECORATE_UNUSED *kVUID_BestPractices_DrawState_ClearCmdBeforeDraw =
"UNASSIGNED-BestPractices-DrawState-ClearCmdBeforeDraw";
static const char DECORATE_UNUSED *kVUID_BestPractices_CreateRenderPass_ImageRequiresMemory =
"UNASSIGNED-BestPractices-vkCreateRenderPass-image-requires-memory";
static const char DECORATE_UNUSED *kVUID_BestPractices_CreateFramebuffer_AttachmentShouldBeTransient =
"UNASSIGNED-BestPractices-vkCreateFramebuffer-attachment-should-be-transient";
static const char DECORATE_UNUSED *kVUID_BestPractices_CreateFramebuffer_AttachmentShouldNotBeTransient =
"UNASSIGNED-BestPractices-vkCreateFramebuffer-attachment-should-not-be-transient";
static const char DECORATE_UNUSED *kVUID_BestPractices_CreatePipelines_TooManyInstancedVertexBuffers =
"UNASSIGNED-BestPractices-vkCreateGraphicsPipelines-too-many-instanced-vertex-buffers";
static const char DECORATE_UNUSED *kVUID_BestPractices_ClearAttachments_ClearAfterLoad =
"UNASSIGNED-BestPractices-vkCmdClearAttachments-clear-after-load";

#endif

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