Mirha Ali’s Post

Using interrupts from the peripherals can be very useful, especially in case of time critical applications. ◾ External Interrupts on GPIO pins (triggered by rising or falling edge) can shed the load of polling the pin continuously. ◾ Timer Interrupt can be used to handle undesired overflows. When used along with an RTOS for example FreeRTOS, the ISR can use atomic objects to enable the RTOS tasks to perform error handling (using task notifications) or pass information (using queues). This also ensures that ISRs are short and do not starve important tasks.   #interrupts #peripherals #FreeRTOS #tasks #embedded 

++ Build an Auto-scaling Inference Service ++ This video is for those of you who want to set up APIs for custom models (can be text or multi-modal). - I walk through the steps involved in setting up inference endpoints. - I weigh the options of a) renting gpus, b) using a serverless service or c) building an auto-scaling service yourself - Then, I build out an auto-scaling service that can be served through a single open-ai style endpoint. I show how to set up a scaling service for SmolLM and also for Qwen multi-modal text plus image models. Find the video over on Trelis Research on YouTube

CVE-2024-39486: Direct Rendering Manager (DRM) of video card. A race leads to use-after-free of a "struct pid" (8 Jul 2024)   Preface: The display pipeline driver responsible for interfacing with the display uses the kernel mode setting (KMS) API and the GPU responsible for drawing objects into memory uses the direct rendering manager (DRM) API.   Background: The Direct Rendering Manager (DRM) is a subsystem of the Linux kernel responsible for interfacing with GPUs of modern video cards. For plain GEM based drivers there is the DEFINE_DRM_GEM_FOPS() macro, and for DMA based drivers there is the DEFINE_DRM_GEM_DMA_FOPS() macro to make this simpler. A refcount records the number of references (i.e., pointers in the C language) to a given memory object. A positive refcount means a memory object could be accessed in the future, hence it should not be freed.   Vulnerability details: filp->pid is supposed to be a refcounted pointer; however, before this patch, drm_file_update_pid() only increments the refcount of a struct pid after storing a pointer to it in filp->pid and dropping the dev->filelist_mutex, making the race possible.   Remark: The official explanation says it may be difficult to encounter this design weakness in reality. Because process A has to pass through a synchronize_rcu() operation while process B is between mutex_unlock() and get_pid(). Vulnerability (CVE-2024-39486) has been resolved.   Official announcement: For detail, please refer to link – https://lnkd.in/gxWjvw8c

This upgrade reduces backend issues with the Raspberry Pi Pico interface using two GPIO buttons: one for copy and one for paste. The copy button now simulates a double mouse click, automatically highlighting the selected word.

Raspberry Pi 5 Compute Module

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Implementing Software Master SPI using GPIO: - -You can implement Software Master SPI (bit-banging) using GPIO in your microcontroller. -This method allows you to manually control the SPI communication using software, rather than relying on dedicated hardware. Here's a step-by-step guide: - 1-Setup GPIO Pins: You need to configure the GPIO pins for the Clock (CLK), Master In Slave Out (MISO), and Chip Select (CS) lines. 2-Communication Process: Clock Control: The master device controls the clock (CLK) line. Reading Bit: You read the bit sent by the slave SPI device on the rising edge of the clock controlled by the master SPI.

To support various AI software, such as, LangChain, etc., and to be able to manage 1000+ GPUs, and to be used by many customers for their critical business tasks, the amount of work grow exponentially. With very limited resources, how am I able to handle them? My eyes turn to this tiny AI cluster I built with just under $3000 GPUs. Can the AI cluster help me to develop itself? With 1.5X, or 2X, or 3X, or 5X, or even 10X productivity improvement? It is good to find them out.

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