Am 07.10.2010 11:13, Gilles Chanteperdrix wrote: > Jan Kiszka wrote: >> Am 04.10.2010 22:13, Edward Hoffman wrote: >>> I am attempting to port the Broadcom tg3 NetXtreme linux driver to >>> rtnet. >> >> Your port will be welcome! >> >>> The Broadcom driver internally utilizes >>> spin_lock_bh/spin_unlock_bh to disable/enable software interrupts. >>> There is no rtdm lock equivalent. >>> I believe that software interrupts are used by the driver for the >>> following reasons: >>> 1. To allow for simultaneous DMA read write operations >>> 2. To use shared local variables in a critical section of the driver. >>> 3. To receive changes to settings variables in realtime from the >>> userpace Nextreme utilities. (not sure about this one). >>> >>> What RTDM lock functions should I use to substitute for >>> spin_lock_bh/spin_unlock_bh? Should I substitute >>> rtdm_lock_get_irqsave/rtdm_lock_put_irqrestore? Or does rtdm need to ne >>> extended for softirqs used internally by the driver? >>> >>> I looked through the other device drivers and could not detect the >>> correct substitute. >> >> As RTDM provides no abstraction of bottom-halves, there are also no >> specific locking services to disable them. You have to use IRQ-disabling >> services unless you are in IRQ context. > > Maybe if you want to only exclude the driver's irq, you may only disable > the irq line at IC level, with rtdm_irq_disable?
Usually discouraged due to potentially slow line-disabling services and the breakage this will cause when the line is shared. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ RTnet-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/rtnet-developers
