Re: How to make mmap'ed kernel buffer non-cacheable

You can do down_interruptible to make the down interruptible. Bhuvan Kumar MITTAL wrote: I'll rephrase the problem as follow: I have a userthread which makes ioctl calls to the kernel and once it reaches inside the kernel it waits on a semaphore. It then does some work inside the kernel and

RE: How to make mmap'ed kernel buffer non-cacheable

I'll rephrase the problem as follow: I have a userthread which makes ioctl calls to the kernel and once it reaches inside the kernel it waits on a semaphore. It then does some work inside the kernel and continuously keeps looping between the kernel and user space in an endless while loop. I

RE: How to make mmap'ed kernel buffer non-cacheable

I'll rephrase the problem as follow: I have a userthread which makes ioctl calls to the kernel and once it reaches inside the kernel it waits on a semaphore. It then does some work inside the kernel and continuously keeps looping between the kernel and user space in an endless while loop. I

Re: How to make mmap'ed kernel buffer non-cacheable

You can do down_interruptible to make the down interruptible. Bhuvan Kumar MITTAL wrote: I'll rephrase the problem as follow: I have a userthread which makes ioctl calls to the kernel and once it reaches inside the kernel it waits on a semaphore. It then does some work inside the kernel and

Re: How to make mmap'ed kernel buffer non-cacheable

Bhuvan Kumar MITTAL wrote: Hi Alan,Nick Thanks for your inputs. I was able to solve the problem of mapping kernel buffer to user space. Just FYI, I am working on a sh4 based architecture proprietary board with Linux kernel 2.6.17.3 So... you used flush_dcache_page? Or what? Initially I

Re: How to make mmap'ed kernel buffer non-cacheable

Bhuvan Kumar MITTAL wrote: Hi Alan,Nick Thanks for your inputs. I was able to solve the problem of mapping kernel buffer to user space. Just FYI, I am working on a sh4 based architecture proprietary board with Linux kernel 2.6.17.3 So... you used flush_dcache_page? Or what? Initially I

RE: How to make mmap'ed kernel buffer non-cacheable

inux-kernel@vger.kernel.org Subject: Re: How to make mmap'ed kernel buffer non-cacheable Bhuvan Kumar MITTAL wrote: > Hi Alan, > > I believe that dma_alloc_coherent will mark the kernel buffer as uncached at > alocation time. > But that is not my intention. I have mapped som

RE: How to make mmap'ed kernel buffer non-cacheable

mmap'ed kernel buffer non-cacheable Bhuvan Kumar MITTAL wrote: Hi Alan, I believe that dma_alloc_coherent will mark the kernel buffer as uncached at alocation time. But that is not my intention. I have mapped some user space memory to the kernel buffer and I wish to ensure

Re: How to make mmap'ed kernel buffer non-cacheable

Bhuvan Kumar MITTAL wrote: Hi Alan, I believe that dma_alloc_coherent will mark the kernel buffer as uncached at alocation time. But that is not my intention. I have mapped some user space memory to the kernel buffer and I wish to ensure that the contents of both are coherent and correctly

RE: How to make mmap'ed kernel buffer non-cacheable

Hi Alan, I believe that dma_alloc_coherent will mark the kernel buffer as uncached at alocation time. But that is not my intention. I have mapped some user space memory to the kernel buffer and I wish to ensure that the contents of both are coherent and correctly ordered. In other words I

RE: How to make mmap'ed kernel buffer non-cacheable

Hi Alan, I believe that dma_alloc_coherent will mark the kernel buffer as uncached at alocation time. But that is not my intention. I have mapped some user space memory to the kernel buffer and I wish to ensure that the contents of both are coherent and correctly ordered. In other words I

Re: How to make mmap'ed kernel buffer non-cacheable

Bhuvan Kumar MITTAL wrote: Hi Alan, I believe that dma_alloc_coherent will mark the kernel buffer as uncached at alocation time. But that is not my intention. I have mapped some user space memory to the kernel buffer and I wish to ensure that the contents of both are coherent and correctly

Re: How to make mmap'ed kernel buffer non-cacheable

On Fri, 20 Apr 2007 18:30:25 +0530 Bhuvan Kumar MITTAL <[EMAIL PROTECTED]> wrote: > Hi, > I am working on an audio device driver development on Linux. I have a > kernel buffer which I have mapped to user space using mmap call from user > space. My problem is that the data which comes to the

Re: How to make mmap'ed kernel buffer non-cacheable

On 20 Apr, 14:20, Bhuvan Kumar MITTAL <[EMAIL PROTECTED]> wrote: Hi, I am working on an audio device driver development on Linux. I have a kernel buffer which I have mapped to user space using mmap call from user space. My problem is that the data which comes to the kernel buffer is getting

Re: How to make mmap'ed kernel buffer non-cacheable

On 20 Apr, 14:20, Bhuvan Kumar MITTAL [EMAIL PROTECTED] wrote: Hi, I am working on an audio device driver development on Linux. I have a kernel buffer which I have mapped to user space using mmap call from user space. My problem is that the data which comes to the kernel buffer is getting

Re: How to make mmap'ed kernel buffer non-cacheable

On Fri, 20 Apr 2007 18:30:25 +0530 Bhuvan Kumar MITTAL [EMAIL PROTECTED] wrote: Hi, I am working on an audio device driver development on Linux. I have a kernel buffer which I have mapped to user space using mmap call from user space. My problem is that the data which comes to the kernel