August 2010 - Darwin-kernel

IOBlockStorageDriver::synchronizeCache
by Niklas Hoglund 06 Aug '10

06 Aug '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.8) Gecko/20100802 Lightning/1.0b2 Thunderbird/3.1.2 Hello! -- Niklas _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… We need to ensure ordering between writes, to make sure one write is not started until another has completed, to avoid potential data corruption in the case of power losses or crashes. In a driver that inherits from IOBlockStorageDriver, can I be sure that any data that has been written to that device has reached the disk surface by calling synchronizeCache, or could drive buffers, NCQ or similar interfere with that. This email sent to site_archiver(a)lists.apple.com

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Re: Getting Physical address of a buffer
by Shantonu Sen 06 Aug '10

06 Aug '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Use IOBufferMemoryDescriptor. No, you cannot map arbitrary virtual addresses to physical, even for wired OSMalloc-ed buffers. If you are intending to use a buffer for DMA, use the appropriate APIs for allocating DMA-safe buffers. Shantonu On Aug 6, 2010, at 4:46 AM, Antoine Missout wrote: > grep xnu for ml_vtophys > > However, it is not exported. > > - Antoine > > On 2010-08-05, at 2:10 PM, shailesh jain wrote: > >> Hello again! >> I have a kernel extension (which is not an IOKit driver) that uses >> OSMalloc_ KPI to allocate buffer. I pass in OSMT_DEFAULT so that >> buffers that it returns are wired to memory. I have a use case where >> in I would like >> to get physical address of the first byte of the buffer. I understand >> that buffer will not be contiguous in Physical memory and I am fine >> with that. Do we have such an interface --- >> >> something like: physAddr = virt_to_phys(buffer); // Gives physical >> address of first byte of the buffer >> >> >> -- >> Shailesh Jain >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/darwin-kernel/antoine.missout%40meta… >> >> This email sent to antoine.missout(a)metakine.com > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/ssen%40apple.com > > This email sent to ssen(a)apple.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Getting Physical address of a buffer
by Antoine Missout 06 Aug '10

06 Aug '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com grep xnu for ml_vtophys However, it is not exported. - Antoine On 2010-08-05, at 2:10 PM, shailesh jain wrote: > Hello again! > I have a kernel extension (which is not an IOKit driver) that uses > OSMalloc_ KPI to allocate buffer. I pass in OSMT_DEFAULT so that > buffers that it returns are wired to memory. I have a use case where > in I would like > to get physical address of the first byte of the buffer. I understand > that buffer will not be contiguous in Physical memory and I am fine > with that. Do we have such an interface --- > > something like: physAddr = virt_to_phys(buffer); // Gives physical > address of first byte of the buffer > > > -- > Shailesh Jain > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/darwin-kernel/antoine.missout%40meta… > > This email sent to antoine.missout(a)metakine.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Re: Getting Physical address of a buffer
by shailesh jain 06 Aug '10

06 Aug '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=Yo0ea4t6Y8YAKWMGvlDw7wMpxLHuLZv9E4MhTsZuUUg=; b=IxgCD2Kp2BCkDZ4rOseJtbDaWVRvfqYFQplcdjLZqEPfsn4C7G1ZN2c5t0zMboWonG HENupIYH/Szx7oQwGlze63axVwm768Nq8HHgDeXcU1QFwg5ivglGCypJB/bIi4idhsBH Q0cPbUA4byLIIpKz58RSYQoxc2SLNxq0l9gaA= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=Ym8P3+dxEpoPaN0mKkfwGXFaIhygMkf+nrWoXrAyvD7qhOkv+WWO7u9gSlM/oXUNwY gwBBku2QAMNbcssxA7hkqDbx2Xc/ugNyEWTF8XjkHiK71QkNBj32asja6A+E2uyFej68 pJckGaAeFYxoQLbySHh/FM9uU3w0VAFJFzGkg= terry ? On Thu, Aug 5, 2010 at 11:10 AM, shailesh jain <coolworldofshail(a)gmail.com> wrote: > Hello again! > I have a kernel extension (which is not an IOKit driver) that uses > OSMalloc_ KPI to allocate buffer. I pass in OSMT_DEFAULT so that > buffers that it returns are wired to memory. I have a use case where > in I would like > to get physical address of the first byte of the buffer. I understand > that buffer will not be contiguous in Physical memory and I am fine > with that. Do we have such an interface --- > > something like: physAddr = virt_to_phys(buffer); // Gives physical > address of first byte of the buffer > > > -- > Shailesh Jain > -- Shailesh Jain _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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Getting Physical address of a buffer
by shailesh jain 05 Aug '10

05 Aug '10

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:date:message-id :subject:from:to:content-type; bh=aEIvDGuxAaMXK2Ij9SjtNOF7/Fiq/7vhdfyFKBBAkp4=; b=TTPI1cKeJbMDdlRcNUFW/voBsi7mtsYCyCpThgPh7Yg0vkOrWc2PJt8FXm3zxtjgxJ +4iSo28cG3kLtPWDrkG9YCZ/Xzwj9bvohVI+hqJNN69Lq+McQ036i24HvZaEdvlPqreT oC74l550PwdqZtrxEcEuHc3KYjkwU0vfEaFP4= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=jhaC6SOWpeiyepffruVhhfdzPyhL3TucvUhJ7GBGXEPqIwFVksMZtJ1iUKnXO6zKvb rorKJmbeMZ2AhS0dFEmqh7XeezvWmjuLS87yQMX3/mJByBqSxW5dEPYhQG3zdbgaJ69n BkZATS0mN9WmsfED/ICqSOcZN6pESg40wArMs= Hello again! I have a kernel extension (which is not an IOKit driver) that uses OSMalloc_ KPI to allocate buffer. I pass in OSMT_DEFAULT so that buffers that it returns are wired to memory. I have a use case where in I would like to get physical address of the first byte of the buffer. I understand that buffer will not be contiguous in Physical memory and I am fine with that. Do we have such an interface --- something like: physAddr = virt_to_phys(buffer); // Gives physical address of first byte of the buffer -- Shailesh Jain _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.… This email sent to site_archiver(a)lists.apple.com

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