Linaro-mm-sig June 2026

linaro-mm-sig@lists.linaro.org

95 participants
462 discussions

[PATCH 00/15] accel/qda: Qualcomm DSP Accelerator driver

by Ekansh Gupta via B4 Relay

This patch series introduces the Qualcomm DSP Accelerator (QDA) driver, a DRM-based accelerator driver for Qualcomm DSPs. The driver provides a standardized interface for offloading computational tasks to DSPs found on Qualcomm SoCs, supporting all DSP domains. The QDA driver implements the FastRPC protocol over the DRM accel subsystem. It uses the same device-tree node structure as the existing fastrpc driver in drivers/misc/. The approach for binding the QDA driver to device-tree nodes while coexisting with the fastrpc driver is an open item described below. RFC thread: https://lore.kernel.org/dri-devel/20260224-qda-firstpost-v1-0-fe46a9c1a046@… User-space staging branch ========================= https://github.com/qualcomm/fastrpc/tree/accel/staging Key Features ============ * Standard DRM accelerator interface via /dev/accel/accelN * GEM-based buffer management with DMA-BUF import/export (PRIME) * IOMMU-based memory isolation using per-process context banks * FastRPC protocol implementation for DSP communication * RPMsg transport layer for reliable message passing * Support for all DSP domains (ADSP, CDSP, SDSP, GDSP) * DRM IOCTL interface for DSP session management, buffer allocation, and remote procedure invocation Architecture ============ 1. DRM Accelerator Framework Integration The driver registers as a DRM accel device, exposing a standard /dev/accel/accelN character device node. This provides established DRM infrastructure for device management, file operations, and IOCTL dispatch. 2. Memory Management Buffers are managed as GEM objects with full PRIME support for DMA-BUF import/export. This enables seamless buffer sharing with other DRM drivers (GPU, camera, video) using standard kernel mechanisms. 3. IOMMU Context Bank Management IOMMU context banks (CBs) are represented as proper struct device instances on a custom virtual bus (qda-compute-cb). Each CB device is registered with the IOMMU subsystem and receives its own IOMMU domain, enabling per-session address space isolation. The custom bus was introduced because IOMMU context banks are synthetic constructs — not real platform devices — and to ensure CB device lifetime is strictly subordinate to the parent QDA device. See also: https://lore.kernel.org/all/245d602f-3037-4ae3-9af9-d98f37258aae@oss.qualco… 4. Memory Manager Architecture A pluggable memory manager coordinates IOMMU device assignment and buffer allocation. The current implementation uses a DMA-coherent backend with SID-prefixed DMA addresses for DSP firmware compatibility. 5. Transport Layer RPMsg communication is handled in a dedicated transport layer (qda_rpmsg.c), separate from the core DRM driver logic. 6. Code Organization The driver is organized across multiple files (~4600 lines total): * qda_drv.c: Core driver and DRM integration * qda_rpmsg.c: RPMsg transport layer * qda_cb.c: Context bank device management * qda_compute_bus.c: Custom virtual bus for CB devices * qda_gem.c: GEM object management * qda_prime.c: DMA-BUF import (PRIME) * qda_memory_manager.c: IOMMU device registry and allocation * qda_memory_dma.c: DMA-coherent allocation backend * qda_fastrpc.c: FastRPC protocol implementation * qda_ioctl.c: IOCTL dispatch 7. UAPI Design The driver exposes DRM-style IOCTLs defined in include/uapi/drm/qda_accel.h, following DRM UAPI conventions (__u32/__u64 types, C++ guard, GPL-2.0-only WITH Linux-syscall-note). Patch Series Organization ========================== Patch 01: MAINTAINERS entry Patch 02: Driver documentation (Documentation/accel/qda/) Patches 03-04: Core driver skeleton and compute bus Patch 05: iommu: Register qda-compute-cb bus with IOMMU subsystem Patches 06-07: CB device enumeration and memory manager Patch 08: QUERY IOCTL and UAPI header Patches 09-11: GEM buffer management and PRIME import Patches 12-15: FastRPC protocol (invoke, session create/release, map/unmap) Open Items =========== 1. Device-Tree Compatible String The QDA driver uses the same device-tree node structure and properties as the existing fastrpc driver in drivers/misc/. A mechanism is needed to allow the QDA driver to bind to its device node independently of the fastrpc driver. The intended coexistence model is: platforms that require the complete fastrpc feature set continue to use "qcom,fastrpc"; new platforms where a feature available only in QDA takes priority, or where QDA's current feature set is sufficient, use a QDA-specific compatible string. New feature development is directed toward QDA rather than the existing fastrpc driver. As QDA matures toward feature parity with fastrpc, platforms can adopt the QDA-specific compatible string exclusively. The options under consideration are: a) Add a new "qcom,qda" compatible string to the existing qcom,fastrpc.yaml binding, since the DT node structure and properties are identical. This avoids a separate binding file but adds a QDA-specific string to a fastrpc binding. b) Introduce a separate qcom,qda.yaml binding that references or inherits the fastrpc binding properties. Seeking guidance from DT binding maintainers on the preferred approach. 2. Privilege Level Management Currently, daemon processes and user processes have the same access level as both use the same accel device node. This needs to be addressed as daemons attach to privileged DSP protection domains and require higher privilege levels for system-level operations. Seeking guidance on the best approach: separate device nodes, capability-based checks, or DRM master/authentication mechanisms. 3. UAPI Compatibility Layer A compatibility layer is needed to facilitate migration of client applications from the existing FastRPC UAPI to the new QDA UAPI, ensuring a smooth transition for existing userspace code. Seeking guidance on the preferred implementation approach: in-kernel translation layer, userspace wrapper library, or hybrid solution. An initial evaluation of an in-kernel translation shim was performed, where legacy FastRPC device nodes (/dev/fastrpc-*) are exposed and requests are internally routed to the QDA accel driver. The goal was to keep the compatibility layer minimal, reuse existing QDA helper paths (attach, buffer allocation, mapping, etc.), and avoid duplication of GEM and buffer management logic. However, the following challenges were identified: a) Dependency on drm_file for QDA helpers QDA relies on GEM-backed allocations and per-client handle namespaces, which require a valid struct drm_file. Since GEM handles are scoped per drm_file, the compatibility layer cannot directly reuse QDA helper paths without establishing a proper drm_file context for each client. b) Lack of public API for drm_file creation Creating a drm_file directly (similar to mock_drm_getfile()-style approaches) is not feasible, as the required helpers (drm_file_alloc(), drm_file_free(), etc.) are internal to the DRM core and not exported. This prevents external drivers from safely constructing and managing drm_file instances. c) VFS-based open is not a viable solution Opening the underlying accel device (/dev/accel/accelN) from the compatibility driver via filp_open() does provide a valid drm_file, but introduces reliance on userspace-visible device paths, lack of stability in containerized or chroot environments, and no clean mapping between legacy device nodes and accel devices. d) Userspace proxy limitations (CUSE) A CUSE-based userspace proxy was evaluated. However, DMA-buf file descriptors passed by legacy applications cannot be directly reused in the CUSE daemon (file descriptors are process-specific), which breaks buffer sharing semantics. e) drm_client-based approaches do not match requirements drm_client APIs (used for fbdev emulation) rely on a shared drm_file and do not provide the per-client isolation required by FastRPC semantics. Due to the above constraints, it is currently unclear how to implement an in-kernel compatibility layer that correctly handles per-client drm_file contexts without relying on VFS paths or non-exported DRM internals. 4. Documentation Improvements Add detailed IOCTL usage examples, document DSP firmware interface requirements, and create a migration guide from the existing FastRPC driver. 5. Per-Session Memory Allocation Develop a userspace API to support memory allocation on a per-session basis, enabling session-specific memory management. 6. Audio and Sensors PD Support The current series does not handle Audio PD and Sensors PD functionalities. These specialized protection domains require additional support for real-time constraints and power management. Interface Compatibility ======================== The QDA driver uses the same device-tree node structure and child node layout (including "qcom,fastrpc-compute-cb" child nodes) as the existing fastrpc driver. The underlying FastRPC protocol and DSP firmware interface are compatible with the existing fastrpc driver, ensuring that DSP firmware and libraries continue to work without modification. References ========== Previous discussions on this migration: - https://lkml.org/lkml/2024/6/24/479 - https://lkml.org/lkml/2024/6/21/1252 Testing ======= The driver has been tested on Qualcomm platforms with: - Basic FastRPC attach/release operations - DSP process creation and initialization - Memory mapping/unmapping operations - Dynamic invocation with various buffer types - GEM buffer allocation and mmap - PRIME buffer import from other subsystems Signed-off-by: Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com> --- Ekansh Gupta (15): MAINTAINERS: Add entry for Qualcomm DSP Accelerator (QDA) driver accel/qda: Add QDA driver documentation accel/qda: Add initial QDA DRM accelerator driver accel/qda: Add compute bus for QDA context banks iommu: Add QDA compute context bank bus to iommu_buses accel/qda: Create compute context bank devices on QDA compute bus accel/qda: Add memory manager for CB devices accel/qda: Add QUERY IOCTL and QDA UAPI header accel/qda: Add DMA-backed GEM objects and memory manager integration accel/qda: Add GEM_CREATE and GEM_MMAP_OFFSET IOCTLs accel/qda: Add PRIME DMA-BUF import support accel/qda: Add FastRPC invocation support accel/qda: Add DSP process creation and release accel/qda: Add remote memory mapping to DSP address space accel/qda: Add remote memory unmap from DSP address space Documentation/accel/index.rst | 1 + Documentation/accel/qda/index.rst | 13 + Documentation/accel/qda/qda.rst | 146 +++++ MAINTAINERS | 9 + drivers/accel/Kconfig | 1 + drivers/accel/Makefile | 2 + drivers/accel/qda/Kconfig | 34 + drivers/accel/qda/Makefile | 19 + drivers/accel/qda/qda_cb.c | 146 +++++ drivers/accel/qda/qda_cb.h | 32 + drivers/accel/qda/qda_compute_bus.c | 68 ++ drivers/accel/qda/qda_drv.c | 192 ++++++ drivers/accel/qda/qda_drv.h | 91 +++ drivers/accel/qda/qda_fastrpc.c | 1058 ++++++++++++++++++++++++++++++++ drivers/accel/qda/qda_fastrpc.h | 390 ++++++++++++ drivers/accel/qda/qda_gem.c | 177 ++++++ drivers/accel/qda/qda_gem.h | 62 ++ drivers/accel/qda/qda_ioctl.c | 296 +++++++++ drivers/accel/qda/qda_ioctl.h | 19 + drivers/accel/qda/qda_memory_dma.c | 110 ++++ drivers/accel/qda/qda_memory_dma.h | 17 + drivers/accel/qda/qda_memory_manager.c | 380 ++++++++++++ drivers/accel/qda/qda_memory_manager.h | 75 +++ drivers/accel/qda/qda_prime.c | 184 ++++++ drivers/accel/qda/qda_prime.h | 18 + drivers/accel/qda/qda_rpmsg.c | 248 ++++++++ drivers/accel/qda/qda_rpmsg.h | 30 + drivers/iommu/iommu.c | 4 + include/linux/qda_compute_bus.h | 32 + include/uapi/drm/qda_accel.h | 229 +++++++ 30 files changed, 4083 insertions(+) --- base-commit: 80dd246accce631c328ea43294e53b2b2dd2aa32 change-id: 20260519-qda-series-78c2bf0ed78b Best regards, -- Ekansh Gupta <ekansh.gupta(a)oss.qualcomm.com>

1 week, 2 days

Pips Game Guide Complete Strategy Tips and Winning Methods Explained

by advanced.finch.jkak＠hidingmail.net

What Pips Game Is About Pips is a modern digital puzzle game that focuses on logic, pattern recognition, and quick decision making. The core idea is to complete tasks or solve challenges by placing or matching elements in a structured environment. Each level increases in difficulty and requires more attention to detail. https://pipsly.io/ Core Appeal of Pips The appeal of Pips comes from its simple start and gradually complex gameplay. Early stages are easy to understand, while later stages demand deeper thinking. This balance makes Pips suitable for both new players and experienced puzzle fans. How to Play Pips Game Basic Gameplay Rules In Pips, the main objective is to interact with puzzle elements and complete specific conditions required by each level. Players must analyze the layout and decide the best moves to achieve the goal in the most efficient way. Step by Step Progression The game usually follows a level based system. Each stage presents a new challenge that builds on previous mechanics. Players progress by solving puzzles correctly and unlocking new stages. Precision and observation are key factors for success. Core Mechanics in Pips Game Pattern Recognition System A major mechanic in Pips is identifying patterns. Players must observe repeating structures and predict outcomes based on visual clues. This helps in solving complex puzzles faster and more accurately. Logic Based Decision Making Every action in Pips requires logical thinking. Random moves often lead to failure or inefficient solutions. Players are encouraged to evaluate all possible outcomes before making a move. Progressive Difficulty Design The difficulty in Pips increases gradually. Early levels focus on teaching basic mechanics, while later levels introduce more complex combinations and constraints. This progression helps maintain engagement over time. Strategies for Winning in Pips Game Careful Planning Before Moves One of the most effective strategies in Pips is planning before acting. Observing the full puzzle layout before making any decision helps avoid mistakes and reduces unnecessary steps. Focus on Efficiency Efficiency is important in Pips. Completing levels with fewer moves or faster decisions often leads to better results. Players should aim to find the most direct solution instead of trial and error approaches. Learning From Repeated Attempts Failure is part of the learning process in Pips. Each attempt provides new information about puzzle structure. By analyzing previous mistakes, players can improve their future performance. Common Mistakes in Pips Game Random Movements Without Strategy A frequent mistake is making random moves without understanding the puzzle. This often leads to confusion and longer completion time. Structured thinking is more effective. Ignoring Visual Clues Pips provides visual hints that guide players toward solutions. Ignoring these clues can make puzzles much harder than intended. Careful observation is essential. Rushing Through Levels Speed without accuracy can reduce success in Pips. Rushing often causes errors that require restarting the level. A balanced approach is recommended for better results. Advanced Tips for Pips Game Mastering Pattern Prediction Advanced players improve by predicting patterns before they fully appear. This skill helps in solving higher difficulty levels with greater consistency. Adapting to New Mechanics Quickly As new mechanics are introduced, flexibility becomes important. Players who adapt quickly to changes in rules or structure perform better in later stages. Combining Multiple Strategies High level gameplay in Pips often requires combining several strategies. Logical analysis, pattern recognition, and efficiency planning must work together for optimal performance. Why Pips Game Attracts Players Simple Yet Deep Gameplay Pips attracts attention because it is easy to start but difficult to master. This combination creates long term interest and encourages repeated play. Rewarding Puzzle Experience Each solved level provides a sense of achievement. The satisfaction of completing complex puzzles motivates continued engagement. Suitable for All Skill Levels Pips is designed for a wide range of players. Beginners can enjoy early levels, while advanced players can challenge themselves with more complex stages. Final Thoughts on Pips Game Long Term Engagement Value Pips offers long term entertainment through its evolving puzzle structure. Continuous updates or level variations can keep the experience fresh and engaging. Skill Development Benefits Playing Pips can help improve logical thinking, pattern recognition, and decision making skills. These benefits extend beyond the game environment. Overall Experience Summary Pips stands out as a thoughtful puzzle game that balances simplicity and depth. Its structured design and increasing challenge levels make it appealing for puzzle enthusiasts who enjoy strategic thinking and problem solving.

1 week, 2 days

Re: [PATCH v3 1/9] PCI/P2PDMA: Add CONFIG_PCI_P2PDMA_CORE

by Pranjal Shrivastava

On Wed, Jun 10, 2026 at 04:43:15PM +0100, Matt Evans wrote: > The P2PDMA code currently provides two features under the same > CONFIG_PCI_P2PDMA option: > > 1. Locate providers via pcim_p2pdma_provider() > 2. Manage actual P2P DMA > > Some drivers (such as vfio-pci) depend on 1, without having a hard > dependency on 2. > > A future commit expands the use of DMABUF in vfio-pci for non-P2P > scenarios, relying on pcim_p2pdma_provider() always being present. If > that depended on CONFIG_PCI_P2PDMA, it would make vfio-pci only > available if CONFIG_ZONE_DEVICE is present (e.g. 64-bit systems), even > when P2P is not needed. > > To resolve this, introduce CONFIG_PCI_P2PDMA_CORE and refactor the > basic provider functionality into a new p2pdma_core.c file. This is > available even if the CONFIG_PCI_P2PDMA feature is disabled (or > unavailable due to !CONFIG_ZONE_DEVICE). Then, drivers can enable any > additional P2P features with the original CONFIG_PCI_P2PDMA (available > when CONFIG_ZONE_DEVICE is set). > > Signed-off-by: Matt Evans <matt(a)ozlabs.org> > --- > MAINTAINERS | 2 +- > drivers/pci/Kconfig | 10 ++-- > drivers/pci/Makefile | 1 + > drivers/pci/p2pdma.c | 109 ++-------------------------------- > drivers/pci/p2pdma.h | 29 +++++++++ > drivers/pci/p2pdma_core.c | 118 +++++++++++++++++++++++++++++++++++++ > include/linux/pci-p2pdma.h | 24 ++++---- > include/linux/pci.h | 2 +- > 8 files changed, 174 insertions(+), 121 deletions(-) > create mode 100644 drivers/pci/p2pdma.h > create mode 100644 drivers/pci/p2pdma_core.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index c2c6d79275c6..b21523b3bd8b 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -20617,7 +20617,7 @@ B: https://bugzilla.kernel.org > C: irc://irc.oftc.net/linux-pci > T: git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git > F: Documentation/driver-api/pci/p2pdma.rst > -F: drivers/pci/p2pdma.c > +F: drivers/pci/p2pdma* > F: include/linux/pci-p2pdma.h > > PCI POWER CONTROL > diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig > index 33c88432b728..59d70bc84cc9 100644 > --- a/drivers/pci/Kconfig > +++ b/drivers/pci/Kconfig > @@ -206,11 +206,7 @@ config PCIE_TPH > config PCI_P2PDMA > bool "PCI peer-to-peer transfer support" > depends on ZONE_DEVICE > - # > - # The need for the scatterlist DMA bus address flag means PCI P2PDMA > - # requires 64bit > - # > - depends on 64BIT > + select PCI_P2PDMA_CORE > select GENERIC_ALLOCATOR > select NEED_SG_DMA_FLAGS > help Nit: Did we drop depends on 64BIT intentionally here? I guess the full PCI_P2PDMA stack still selects NEED_SG_DMA_FLAGS? IIRC, NEED_SG_DMA_FLAGS doesn't select 64BIT? With the nit (and Bjorn's comments addressed) Reviewed-by: Pranjal Shrivastava <praan(a)google.com> Thanks, Praan

1 week, 2 days

Rolling into the Fun: A Guide to the Addictive World of Slope Game

by specific.salmon.rrgs＠hidingmail.net

Ever found yourself in need of a quick, engaging, and surprisingly challenging game that you can jump into anytime, anywhere? Look no further than the captivating world of Slope Game. This seemingly simple title offers a deceptively deep experience, testing your reflexes and spatial awareness in a way that’s both frustrating and incredibly rewarding. If you've never rolled into its vibrant, geometric landscapes, you're in for a treat! https://slopegamefree.com/ Gameplay: Master the Art of the Tilt Playing Slope Game is refreshingly straightforward. Your primary objective is to keep your ball from falling off the edges of the platforms or colliding with red obstacles. The ball is always moving forward, and your only controls are to steer it left or right. Steering: On a desktop, you'll typically use the A and D keys or the left and right arrow keys to shift the ball's direction. On mobile devices, it’s often a touch-and-drag or tilt-to-steer mechanism. The key is subtlety. Small, precise adjustments are far more effective than wild, sweeping movements, which will often send your ball careening off the edge. Speed: The ball constantly gains speed, which is where the real challenge lies. As you progress, the platforms become narrower, the gaps wider, and the red obstacles more frequent. What was a gentle curve at the start becomes a frantic maneuver later on. Obstacles: Keep a keen eye out for the static and sometimes moving red blocks. Touching these spells instant doom. Learning their patterns and anticipating their appearance is crucial for long-term survival. Tips for Rolling Success While it may seem like pure luck at first, there are definite strategies you can employ to improve your high score: Focus on the Path Ahead: Don't just look at where your ball is; always be scanning the screen for what's coming up next. This allows you to plan your turns and avoid sudden surprises. Small Adjustments are Key: Resist the urge to oversteer. Gentle taps or small nudges are almost always more effective than holding down a direction key, especially as your speed increases. Embrace the Center: Whenever possible, try to keep your ball centered on the path. This gives you the most leeway for unexpected obstacles or sudden turns. Learn from Your Fails: Every time you fall, take a moment to understand why. Did you oversteer? Miss an obstacle? Knowing your weaknesses will help you avoid repeating the same mistakes. Practice Makes Perfect: Like any skill-based game, consistent practice is the best way to improve. Your reflexes will sharpen, and your muscle memory for precise steering will develop over time. Conclusion: A Simple Game, Endless Fun Slope Game embodies the beauty of simplicity in game design. It doesn't rely on flashy graphics or complex storylines, but rather on addictive gameplay that challenges your reflexes and keeps you coming back for "just one more run." Whether you have a few minutes to spare or an hour to dedicate, this game offers a rewarding and endlessly replayable experience. So, if you're looking for a fun and engaging way to test your agility, give Slope Game a try – you might just find your new favorite time-waster.

1 week, 2 days

Unlocking the Joy of Spatial Puzzles: A Deep Dive into Block Blast

by yappy.mink.rxln＠hidingmail.net

Feeling the itch for a satisfying puzzle challenge? Look no further than games like Block Blast. These engaging tile-matching experiences offer a delightful blend of strategy and spatial reasoning, perfect for a quick mental workout or a longer, relaxing session. Let's explore how to get the most out of these captivating games. https://blockblasts.io/ Introduction: What is Block Blasting? At its core, a block-blasting game is about clearing a grid by strategically placing various-shaped blocks. Imagine a blend of Tetris and a jigsaw puzzle, where your goal isn't just to complete lines, but to eliminate entire clusters of blocks. The beauty lies in its simplicity: no complex narratives or intricate controls, just pure, unadulterated puzzle-solving fun. Many versions of this game exist, but for this article, we’ll be focusing on a general approach that applies to most variations, including Block Blast itself. Gameplay: The Fundamentals of Cube Clearing The basic premise is straightforward. You're presented with a grid, typically 8x8 or 10x10, and a queue of three randomly generated blocks at the bottom of your screen. Your task is to drag and drop these blocks onto the grid. The magic happens when you form a complete horizontal or vertical line (or sometimes both) with your placed blocks. Once a line is complete, it disappears, freeing up space and earning you points. The challenge intensifies as the grid fills up. If you run out of space to place any of the three available blocks, the game ends. This creates a constant tension and encourages careful planning. Some games also feature special blocks – perhaps a bomb that clears a small area, or a rotating block that offers more placement options. These additions add another layer of strategic depth, keeping the gameplay fresh and exciting. Tips for Becoming a Block Blast Champion While Block Blast is easy to pick up, mastering it requires a bit of strategy. Here are a few tips to help you maximize your scores and playtime: Look Ahead: Always consider the next few blocks in your queue. Don't just place a block to clear one line if it compromises your ability to place subsequent, larger blocks. Keep the Center Clear: It's tempting to fill up the edges first, but an open center gives you far more flexibility for larger, irregularly shaped blocks. Prioritize Large Blocks: While clearing single lines is good, try to set up opportunities to clear multiple lines simultaneously, or to use your larger blocks effectively. Don't Be Afraid to Sacrifice: Sometimes, you might need to place a block in a less-than-ideal spot to avoid an immediate game over. It's about damage control. Identify Patterns: As you play more, you'll start to recognize common block combinations and how they fit together best. Practice truly makes perfect here. Utilize Special Blocks Wisely: If your game has them, don't just use special blocks impulsively. Save bombs for truly sticky situations, or use rotators to maximize space. Conclusion: A Refreshing Puzzle Experience Games like Block Blast offer a genuinely enjoyable and mentally stimulating experience. They're easy to pick up, yet provide endless opportunities for strategic refinement. Whether you're looking to unwind after a long day or sharpen your problem-solving skills, these block-clearing puzzles are a fantastic choice. So, what are you waiting for? Dive in and start blasting those blocks!

1 week, 2 days

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by priyankaragade6＠gmail.com

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1 week, 2 days

MUYERN TRUST HAC KER || Private Digital Security

by priyankaragade6＠gmail.com

1 week, 2 days

Re: [PATCH v3 1/9] PCI/P2PDMA: Add CONFIG_PCI_P2PDMA_CORE

by Bjorn Helgaas

On Wed, Jun 10, 2026 at 04:43:15PM +0100, Matt Evans wrote: > The P2PDMA code currently provides two features under the same > CONFIG_PCI_P2PDMA option: > > 1. Locate providers via pcim_p2pdma_provider() > 2. Manage actual P2P DMA > > Some drivers (such as vfio-pci) depend on 1, without having a hard > dependency on 2. > > A future commit expands the use of DMABUF in vfio-pci for non-P2P > scenarios, relying on pcim_p2pdma_provider() always being present. If > that depended on CONFIG_PCI_P2PDMA, it would make vfio-pci only > available if CONFIG_ZONE_DEVICE is present (e.g. 64-bit systems), even > when P2P is not needed. > > To resolve this, introduce CONFIG_PCI_P2PDMA_CORE and refactor the > basic provider functionality into a new p2pdma_core.c file. This is > available even if the CONFIG_PCI_P2PDMA feature is disabled (or > unavailable due to !CONFIG_ZONE_DEVICE). Then, drivers can enable any > additional P2P features with the original CONFIG_PCI_P2PDMA (available > when CONFIG_ZONE_DEVICE is set). > > Signed-off-by: Matt Evans <matt(a)ozlabs.org> I thought this was going to be just a code move and new Kconfig option, but it involves a little more than that, e.g., adding pci_p2pdma_release_pool() and tweaking the RCU synchronization. If possible, it would be nice to do that refactoring in a smaller preliminary patch so it's easier to review/bisect/etc and make this one a pure code move. I guess CONFIG_PCI_P2PDMA_CORE selects just part 1 ("Locate providers via pcim_p2pdma_provider()"), right? > +++ b/drivers/pci/p2pdma.h > @@ -0,0 +1,29 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * PCI Peer 2 Peer DMA support. > + */ > + > +#ifndef _PCI_P2PDMA_H > +#define _PCI_P2PDMA_H > + > +#include <linux/genalloc.h> > +#include <linux/pci-p2pdma.h> > +#include <linux/xarray.h> > + > +struct pci_p2pdma { > + struct gen_pool *pool; > + bool p2pmem_published; > + struct xarray map_types; > + struct p2pdma_provider mem[PCI_STD_NUM_BARS]; > +}; > + > +#ifdef CONFIG_PCI_P2PDMA > +void pci_p2pdma_release_pool(struct pci_dev *pdev, struct pci_p2pdma *p2pdma); > +#else > +static inline void pci_p2pdma_release_pool(struct pci_dev *pdev, struct pci_p2pdma *p2pdma) Wrap to fit in 80 columns like the rest of drivers/pci/ > +{ > +} > +#endif > + > +#endif > + Spurious blank line at end. > +++ b/drivers/pci/p2pdma_core.c > @@ -0,0 +1,118 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * PCI Peer 2 Peer DMA support core, providing a bare-bones In this English text, I think I would spell out "Peer to Peer" instead of relying on the "2" homophone. Same in p2pdma.h.

1 week, 3 days

Re: [PATCH] dma-buf: move system_cc_shared heap under separate Kconfig

by Sumit Semwal

Hi Jiri, On Thu, 11 Jun 2026 at 15:51, Jiri Pirko <jiri(a)resnulli.us> wrote: > > Wed, Jun 10, 2026 at 04:23:29PM +0200, sumit.semwal(a)linaro.org wrote: > >From: Arnd Bergmann <arnd(a)arndb.de> > > > >While system heap and system_cc_shared heap share a lot of code > >and hence the same source file, their users have different needs. > > > >system heap users need it to be a loadable module, while > >system_cc_shared heap users don't. > > > >Building as a loadable module breaks system_cc_shared heap on > >powerpc and s390 due to un-exported set_memory_encrypted / > >set_memory_decrypted functions. > > > >Fix these by reorganising code to put the system_cc_shared heap > >under a new Kconfig symbol, which allows either building both > >into the kernel, or leave encryption up to the consumers of the > >system heap. > > > >Fixes: fd55edff8a0a ("dma-buf: heaps: system: Turn the heap into a module") > >Signed-off-by: Arnd Bergmann <arnd(a)arndb.de> > >Signed-off-by: Sumit Semwal <sumit.semwal(a)linaro.org> > >--- > > drivers/dma-buf/heaps/Kconfig | 8 ++++++++ > > drivers/dma-buf/heaps/system_heap.c | 16 ++++++++++------ > > 2 files changed, 18 insertions(+), 6 deletions(-) > > > >diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig > >index e273fb18feca..a39decdcf067 100644 > >--- a/drivers/dma-buf/heaps/Kconfig > >+++ b/drivers/dma-buf/heaps/Kconfig > >@@ -5,6 +5,14 @@ config DMABUF_HEAPS_SYSTEM > > Choose this option to enable the system dmabuf heap. The system heap > > is backed by pages from the buddy allocator. If in doubt, say Y. > > > >+config DMABUF_HEAPS_CC_SYSTEM > > Nit: "DMABUF_HEAPS_SYSTEM_CC_SHARED" to be consistent with the heap > name? > > With or without it: > Reviewed-by: Jiri Pirko <jiri(a)nvidia.com> > Thanks for catching this; I'll fix this while pushing to drm-misc-next-fixes in a few minutes. Best, Sumit.

1 week, 3 days

Discovering the Blocky Worlds of Eaglercraft

by limited.toad.zjzg＠hidingmail.net

Have you ever felt the urge to build towering castles, explore deep caves, or simply survive a night in a world made entirely of blocks? If you've heard of Minecraft, you know the feeling. But what if you could jump into a similar sandbox experience right from your web browser, with no installation required? Enter Eaglercraft, a fascinating project that brings a familiar block-based adventure to everyone with an internet connection. https://eaglercraftweb.com/ What is Eaglercraft and How Do You Play? At its core, Eaglercraft is an open-source project that emulates the classic Minecraft experience (specifically, older versions like 1.5.2) and runs entirely in a web browser. This means you can play on a school computer, a friend’s laptop, or any device that can open a website, making it incredibly accessible. Getting started is as simple as it sounds: Launch the Game: Navigate to an Eaglercraft website. Choose Your Name: Pick a username for your in-game character. Select a Game Mode: You’ll typically find two main options: Singleplayer: This is your own private world. You can choose between Survival Mode, where you must gather resources and fend off monsters to survive, or Creative Mode, where you have unlimited resources and can fly, allowing you to build anything you can imagine without limits. Multiplayer: This is where you can join servers and play with others. You can team up to build massive cities, compete in mini-games like sky-wars, or join survival servers to brave the world together. Once in the game, the controls are straightforward for anyone who has played a first-person PC game. You use W, A, S, D to move, the mouse to look around, the left mouse button to break blocks or attack, and the right mouse button to place blocks or interact with objects. Tips for a Great First Experience Jumping into a new world can be a bit overwhelming, so here are a few friendly tips to get you started on the right foot: Your First Day is Crucial: If you're in Survival mode, your first priority is to gather wood. Punch a tree to get logs, then use your inventory to craft them into planks. From there, make a crafting table. This table is your key to unlocking all other tools and items. Shelter Before Dark: Nighttime brings monsters. Before the sun sets, use your newly gathered wood or dirt to build a simple shelter. Even a small dirt hut will keep you safe until morning. A bed, crafted from wool and planks, will allow you to skip the night entirely. Explore Multiplayer Servers: The real magic of Eaglercraft often lies in its community. Don't be shy about joining a multiplayer server. You’ll find incredible player-made creations and different game modes you can’t experience in singleplayer. Just remember to be respectful and follow the server’s rules. Don't Be Afraid to Experiment: The beauty of a sandbox game is that there is no right or wrong way to play. Want to spend your time farming? Go for it. Feel like digging straight down to find diamonds? Be careful, but have fun! Let your curiosity guide you. A World of Your Own Making Eaglercraft serves as a wonderful gateway into the world of sandbox games. It captures the essence of creative freedom and survival adventure that has made the genre so beloved, while removing the barrier of installations or powerful hardware. Whether you’re looking to relive some nostalgic moments or trying a block-building game for the very first time, it offers a simple and delightful way to explore, build, and connect with a community of fellow players. So go ahead, load it up, and see what kind of world you can create.

1 week, 3 days

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Linaro-mm-sig June 2026