wl_shm: use udmabuf directly as texture on integrated GPUs

src/gfx_api.rs

@@ -749,6 +749,8 @@ pub trait GfxContext: Debug {
 
     fn formats(&self) -> Rc<AHashMap<u32, GfxFormat>>;
 
+    fn fast_ram_access(&self) -> bool;
+
     fn dmabuf_fb(self: Rc<Self>, buf: &DmaBuf) -> Result<Rc<dyn GfxFramebuffer>, GfxError> {
         self.dmabuf_img(buf)?.to_framebuffer()
     }

src/gfx_apis/gl/egl/display.rs

@@ -68,6 +68,7 @@ pub struct EglDisplay {
     pub gbm: Rc<GbmDevice>,
     pub dpy: EGLDisplay,
     pub explicit_sync: bool,
+    pub fast_ram_access: bool,
 }
 
 impl EglDisplay {
@@ -106,16 +107,20 @@ impl EglDisplay {
                 gbm: Rc::new(gbm),
                 dpy,
                 explicit_sync: false,
+                fast_ram_access: false,
             };
             let mut major = 0;
             let mut minor = 0;
             if (egl.eglInitialize)(dpy.dpy, &mut major, &mut minor) != EGL_TRUE {
                 return Err(RenderError::Initialize);
             }
-            if !software && EXTS.contains(EXT_DEVICE_QUERY) {
-                if get_device_ext(procs, dpy.dpy)?.contains(MESA_DEVICE_SOFTWARE) {
+            if EXTS.contains(EXT_DEVICE_QUERY)
+                && get_device_ext(procs, dpy.dpy)?.contains(MESA_DEVICE_SOFTWARE)
+            {
+                if !software {
                     return Err(RenderError::NoHardwareRenderer);
                 }
+                dpy.fast_ram_access = true;
             }
             dpy.exts = get_display_ext(dpy.dpy);
             if !dpy.exts.intersects(KHR_IMAGE_BASE) {

src/gfx_apis/gl/renderer/context.rs

@@ -257,6 +257,10 @@ impl GfxContext for GlRenderContext {
         self.formats()
     }
 
+    fn fast_ram_access(&self) -> bool {
+        self.ctx.dpy.fast_ram_access
+    }
+
     fn dmabuf_fb(self: Rc<Self>, buf: &DmaBuf) -> Result<Rc<dyn GfxFramebuffer>, GfxError> {
         (&self)
             .dmabuf_fb(buf)

src/gfx_apis/vulkan.rs

@@ -280,6 +280,10 @@ impl GfxContext for Context {
         self.0.formats.clone()
     }
 
+    fn fast_ram_access(&self) -> bool {
+        self.0.device.fast_ram_access
+    }
+
     fn dmabuf_img(self: Rc<Self>, buf: &DmaBuf) -> Result<Rc<dyn GfxImage>, GfxError> {
         self.0
             .import_dmabuf(buf)

src/gfx_apis/vulkan/device.rs

@@ -83,6 +83,7 @@ pub struct VulkanDevice {
     pub(super) uniform_buffer_offset_mask: DeviceSize,
     pub(super) uniform_buffer_descriptor_size: usize,
     pub(super) lost: Cell<bool>,
+    pub(super) fast_ram_access: bool,
 }
 
 impl Drop for VulkanDevice {
@@ -129,7 +130,7 @@ impl VulkanInstance {
         }
     }
 
-    fn find_dev(&self, drm: &Drm) -> Result<PhysicalDevice, VulkanError> {
+    fn find_dev(&self, drm: &Drm) -> Result<(PhysicalDevice, PhysicalDeviceType), VulkanError> {
         let dev = drm.dev();
         log::log!(
             self.log_level,
@@ -188,7 +189,7 @@ impl VulkanInstance {
                     Some(&extensions),
                     Some(&driver_props),
                 );
-                return Ok(phy_dev);
+                return Ok((phy_dev, props.device_type));
             }
             devices.push((props, Some(extensions), Some(driver_props)));
         }
@@ -210,7 +211,7 @@ impl VulkanInstance {
         Err(VulkanError::NoDeviceFound(dev))
     }
 
-    fn find_software_renderer(&self) -> Result<PhysicalDevice, VulkanError> {
+    fn find_software_renderer(&self) -> Result<(PhysicalDevice, PhysicalDeviceType), VulkanError> {
         let phy_devs = unsafe { self.instance.enumerate_physical_devices() };
         let phy_devs = match phy_devs {
             Ok(d) => d,
@@ -222,7 +223,7 @@ impl VulkanInstance {
                 continue;
             }
             if props.device_type == PhysicalDeviceType::CPU {
-                return Ok(phy_dev);
+                return Ok((phy_dev, props.device_type));
             }
         }
         Err(VulkanError::NoSoftwareRenderer)
@@ -344,7 +345,7 @@ impl VulkanInstance {
             .ok_or(VulkanError::NoRenderNode)
             .map(Rc::new)?;
         let gbm = GbmDevice::new(drm).map_err(VulkanError::Gbm)?;
-        let phy_dev = match software {
+        let (phy_dev, dev_ty) = match software {
             true => self.find_software_renderer()?,
             false => self.find_dev(drm)?,
         };
@@ -543,6 +544,11 @@ impl VulkanInstance {
                 "Created queues with priorities {max_graphics_priority:?}/{max_transfer_priority:?}",
             );
         }
+        let fast_ram_access = match dev_ty {
+            PhysicalDeviceType::CPU => true,
+            PhysicalDeviceType::INTEGRATED_GPU => true,
+            _ => false,
+        };
         Ok(Rc::new(VulkanDevice {
             physical_device: phy_dev,
             render_node,
@@ -572,6 +578,7 @@ impl VulkanInstance {
             uniform_buffer_offset_mask,
             uniform_buffer_descriptor_size,
             lost: Cell::new(false),
+            fast_ram_access,
         }))
     }
 }

src/ifs/wl_buffer.rs

@@ -9,7 +9,10 @@ use {
         object::{Object, Version},
         rect::{Rect, Region},
         utils::{errorfmt::ErrorFmt, page_size::page_size},
-        video::dmabuf::DmaBuf,
+        video::{
+            LINEAR_MODIFIER,
+            dmabuf::{DmaBuf, DmaBufPlane},
+        },
         wire::{WlBufferId, wl_buffer::*},
     },
     std::{
@@ -41,6 +44,8 @@ pub struct DmabufBufferParams {
     udmabuf_impossible: bool,
     host_buffer: Option<Rc<dyn GfxBuffer>>,
     host_buffer_impossible: bool,
+    tex: Option<Rc<dyn GfxTexture>>,
+    tex_impossible: bool,
 }
 
 pub struct WlBuffer {
@@ -120,15 +125,18 @@ impl WlBuffer {
         if (stride as u64) < min_row_size {
             return Err(WlBufferError::StrideTooSmall);
         }
+        let udmabuf_impossible = !mem.pool().is_sealed_memfd();
         let dmabuf_buffer_params = match udmabuf {
             None => DmabufBufferParams {
                 size: bytes as usize,
                 udmabuf: None,
                 udmabuf_offset: 0,
                 udmabuf_size: 0,
-                udmabuf_impossible: !mem.pool().is_sealed_memfd(),
+                udmabuf_impossible,
                 host_buffer: None,
-                host_buffer_impossible: !mem.pool().is_sealed_memfd(),
+                host_buffer_impossible: udmabuf_impossible,
+                tex: None,
+                tex_impossible: udmabuf_impossible,
             },
             Some((udmabuf, size)) => DmabufBufferParams {
                 size,
@@ -138,6 +146,8 @@ impl WlBuffer {
                 udmabuf_impossible: false,
                 host_buffer: None,
                 host_buffer_impossible: false,
+                tex: None,
+                tex_impossible: false,
             },
         };
         Ok(Self {
@@ -209,20 +219,22 @@ impl WlBuffer {
                         udmabuf_impossible,
                         host_buffer,
                         host_buffer_impossible,
+                        tex,
+                        tex_impossible,
                         ..
                     },
                 ..
             } => {
                 host_buffer.take();
                 *host_buffer_impossible = *udmabuf_impossible;
-                return match surface {
-                    Some(s) => {
-                        s.shm_staging.take();
-                        s.shm_textures.back().tex.take();
-                        s.shm_textures.front().tex.take().is_some()
-                    }
-                    None => false,
-                };
+                let mut had_texture = tex.take().is_some();
+                *tex_impossible = *udmabuf_impossible;
+                if let Some(s) = surface {
+                    s.shm_staging.take();
+                    s.shm_textures.back().tex.take();
+                    had_texture |= s.shm_textures.front().tex.take().is_some();
+                }
+                return had_texture;
             }
             WlBufferStorage::Dmabuf { tex, .. } => tex.is_some(),
         };
@@ -255,7 +267,13 @@ impl WlBuffer {
         match &*self.storage.borrow() {
             None => None,
             Some(s) => match s {
-                WlBufferStorage::Shm { .. } => {
+                WlBufferStorage::Shm {
+                    dmabuf_buffer_params,
+                    ..
+                } => {
+                    if let Some(tex) = &dmabuf_buffer_params.tex {
+                        return Some(tex.clone());
+                    }
                     surface.shm_textures.front().tex.get().map(|t| t as _)
                 }
                 WlBufferStorage::Dmabuf { tex, .. } => tex.clone(),
@@ -269,20 +287,57 @@ impl WlBuffer {
         }
     }
 
-    pub fn get_gfx_buffer(
-        self: &Rc<Self>,
-        ctx: &Rc<dyn GfxContext>,
+    pub fn get_udmabuf(
+        &self,
         mem: &Rc<ClientMemOffset>,
         dmabuf_buffer_params: &mut DmabufBufferParams,
-    ) -> Option<Rc<dyn GfxBuffer>> {
+    ) -> Option<Rc<OwnedFd>> {
         let DmabufBufferParams {
             size,
             udmabuf,
             udmabuf_offset,
             udmabuf_size,
             udmabuf_impossible,
+            ..
+        } = dmabuf_buffer_params;
+        if let Some(b) = udmabuf {
+            return Some(b.clone());
+        }
+        if *udmabuf_impossible {
+            return None;
+        }
+        let dev = self.client.state.udmabuf.get()?;
+        let mask = page_size() - 1;
+        let offset = mem.offset() & mask;
+        let base = mem.offset() & !mask;
+        let end = (mem.offset() + *size + mask) & !mask;
+        let len = end - base;
+        match dev.create_dmabuf_from_memfd(mem.pool().fd(), base, len) {
+            Ok(b) => {
+                let b = Rc::new(b);
+                *udmabuf_offset = offset;
+                *udmabuf_size = len;
+                *udmabuf = Some(b.clone());
+                Some(b)
+            }
+            Err(e) => {
+                *udmabuf_impossible = true;
+                log::debug!("Could not create udmabuf: {}", ErrorFmt(e));
+                None
+            }
+        }
+    }
+
+    pub fn get_gfx_buffer(
+        &self,
+        ctx: &Rc<dyn GfxContext>,
+        mem: &Rc<ClientMemOffset>,
+        dmabuf_buffer_params: &mut DmabufBufferParams,
+    ) -> Option<Rc<dyn GfxBuffer>> {
+        let DmabufBufferParams {
             host_buffer,
             host_buffer_impossible,
+            ..
         } = dmabuf_buffer_params;
         if let Some(hb) = host_buffer {
             return Some(hb.clone());
@@ -290,36 +345,14 @@ impl WlBuffer {
         if *host_buffer_impossible {
             return None;
         }
-        let udmabuf = 'udmabuf: {
-            if let Some(b) = udmabuf {
-                break 'udmabuf b.clone();
-            }
-            if *udmabuf_impossible {
-                return None;
-            }
-            let Some(dev) = self.client.state.udmabuf.get() else {
-                return None;
-            };
-            let mask = page_size() - 1;
-            let offset = mem.offset() & mask;
-            let base = mem.offset() & !mask;
-            let end = (mem.offset() + *size + mask) & !mask;
-            let len = end - base;
-            match dev.create_dmabuf_from_memfd(mem.pool().fd(), base, len) {
-                Ok(b) => {
-                    let b = Rc::new(b);
-                    *udmabuf_offset = offset;
-                    *udmabuf_size = len;
-                    *udmabuf = Some(b.clone());
-                    b
-                }
-                Err(e) => {
-                    *udmabuf_impossible = true;
-                    log::debug!("Could not create udmabuf: {}", ErrorFmt(e));
-                    return None;
-                }
-            }
-        };
+        let udmabuf = self.get_udmabuf(mem, dmabuf_buffer_params)?;
+        let DmabufBufferParams {
+            udmabuf_offset,
+            udmabuf_size,
+            host_buffer,
+            host_buffer_impossible,
+            ..
+        } = dmabuf_buffer_params;
         let hb =
             match ctx.create_dmabuf_buffer(&udmabuf, *udmabuf_offset, *udmabuf_size, self.format) {
                 Ok(hb) => hb,
@@ -333,6 +366,67 @@ impl WlBuffer {
         Some(hb)
     }
 
+    pub fn import_udmabuf_texture(
+        &self,
+        ctx: &Rc<dyn GfxContext>,
+        mem: &Rc<ClientMemOffset>,
+        stride: i32,
+        dmabuf_buffer_params: &mut DmabufBufferParams,
+    ) -> bool {
+        let DmabufBufferParams {
+            tex,
+            tex_impossible,
+            ..
+        } = dmabuf_buffer_params;
+        if tex.is_some() {
+            return true;
+        }
+        if *tex_impossible {
+            return false;
+        }
+        let Some(udmabuf) = self.get_udmabuf(mem, dmabuf_buffer_params) else {
+            return false;
+        };
+        let DmabufBufferParams {
+            udmabuf_offset,
+            tex,
+            tex_impossible,
+            ..
+        } = dmabuf_buffer_params;
+        let mut dmabuf = DmaBuf {
+            id: self.client.state.dma_buf_ids.next(),
+            width: self.width,
+            height: self.height,
+            format: self.format,
+            modifier: LINEAR_MODIFIER,
+            planes: Default::default(),
+            is_disjoint: Default::default(),
+        };
+        dmabuf.planes.push(DmaBufPlane {
+            offset: *udmabuf_offset as _,
+            stride: stride as _,
+            fd: udmabuf,
+        });
+        let img = match ctx.clone().dmabuf_img(&dmabuf) {
+            Ok(i) => i,
+            Err(e) => {
+                *tex_impossible = true;
+                log::debug!("Could not import udmabuf as GfxImage: {}", ErrorFmt(e));
+                return false;
+            }
+        };
+        let tex_ = match img.to_texture() {
+            Ok(i) => i,
+            Err(e) => {
+                *tex_impossible = true;
+                log::debug!("Could not import udmabuf as GfxTexture: {}", ErrorFmt(e));
+                return false;
+            }
+        };
+        *tex = Some(tex_);
+        true
+    }
+
     fn update_texture(&self, surface: &WlSurface, sync_shm: bool) -> Result<(), WlBufferError> {
         let storage = &mut *self.storage.borrow_mut();
         let storage = match storage {
@@ -340,19 +434,33 @@ impl WlBuffer {
             _ => return Ok(()),
         };
         match storage {
-            WlBufferStorage::Shm { mem, stride, .. } => {
-                if sync_shm && let Some(ctx) = self.client.state.render_ctx.get() {
-                    let tex = ctx.async_shmem_texture(
-                        self.format,
-                        self.width,
-                        self.height,
-                        *stride,
-                        &self.client.state.cpu_worker,
-                    )?;
-                    mem.access(|mem| tex.clone().sync_upload(mem, Region::new(self.rect)))??;
-                    surface.shm_textures.front().tex.set(Some(tex));
-                    surface.shm_textures.front().damage.clear();
+            WlBufferStorage::Shm {
+                mem,
+                stride,
+                dmabuf_buffer_params,
+                ..
+            } => {
+                if !sync_shm {
+                    return Ok(());
                 }
+                let Some(ctx) = self.client.state.render_ctx.get() else {
+                    return Ok(());
+                };
+                if ctx.fast_ram_access()
+                    && self.import_udmabuf_texture(&ctx, mem, *stride, dmabuf_buffer_params)
+                {
+                    return Ok(());
+                }
+                let tex = ctx.async_shmem_texture(
+                    self.format,
+                    self.width,
+                    self.height,
+                    *stride,
+                    &self.client.state.cpu_worker,
+                )?;
+                mem.access(|mem| tex.clone().sync_upload(mem, Region::new(self.rect)))??;
+                surface.shm_textures.front().tex.set(Some(tex));
+                surface.shm_textures.front().damage.clear();
             }
             WlBufferStorage::Dmabuf { img, tex, .. } => {
                 if tex.is_none() {

src/ifs/wl_surface/commit_timeline.rs

@@ -608,6 +608,20 @@ fn schedule_async_upload(
         return Ok(None);
     };
     let back = surface.shm_textures.back();
+    let state = &surface.client.state;
+    let ctx = state
+        .render_ctx
+        .get()
+        .ok_or(WlSurfaceError::NoRenderContext)?;
+    if ctx.fast_ram_access() && buf.import_udmabuf_texture(&ctx, mem, *stride, dmabuf_buffer_params)
+    {
+        back.damage.clear();
+        back.tex.take();
+        if surface.shm_textures.front().tex.is_none() {
+            surface.shm_staging.take();
+        }
+        return Ok(None);
+    }
     let mut back_tex_opt = back.tex.get();
     if let Some(back_tex) = &back_tex_opt
         && !back_tex.compatible_with(buf.format, buf.rect.width(), buf.rect.height(), *stride)
@@ -618,11 +632,6 @@ fn schedule_async_upload(
         back.damage.clear();
         back.damage.damage(slice::from_ref(&buf.rect));
     };
-    let state = &surface.client.state;
-    let ctx = state
-        .render_ctx
-        .get()
-        .ok_or(WlSurfaceError::NoRenderContext)?;
     let back_tex = match back_tex_opt {
         Some(b) => {
             if pending.damage_full || pending.surface_damage.is_not_empty() {

src/it/test_gfx_api.rs

@@ -107,6 +107,10 @@ impl GfxContext for TestGfxCtx {
         self.formats.clone()
     }
 
+    fn fast_ram_access(&self) -> bool {
+        true
+    }
+
     fn dmabuf_img(self: Rc<Self>, buf: &DmaBuf) -> Result<Rc<dyn GfxImage>, GfxError> {
         Ok(Rc::new(TestGfxImage::DmaBuf(TestDmaBufGfxImage {
             buf: buf.clone(),