Hello: I have the following setup: PPC405EX Linux 2.6.30.3 Xenomai 2.4.10 I-pipe 2.7-02 ppc_4xx-gcc (GCC) 4.2.2 Configuration file is attached
I am writing an RTDM driver to allocate DMA memory and map it to user space using functions: pci_alloc_consistent() rtdm_mmap_to_user() Driver can access this memory but user space access causes Oops and Kernel panic: DataData machine check in kernel mode. Oops: Machine check, sig: 7 [#1] Flex-AM Modules linked in: magnum dsp vreg vsync flx_alt_tse codec flx_alt_fpga at24 pca 953x [last unloaded: at24] NIP: c0008e24 LR: c0010920 CTR: c01d50d0 REGS: cfff9f50 TRAP: 0202 Not tainted (2.6.30.3-00059-g8f94ee9) MSR: 00021030 <ME,CE,IR,DR> CR: 04000022 XER: 20000000 TASK = cf635ce0[1455] 'ancvbirt' THREAD: cf646000 GPR00: 00008030 cf647d60 cf635ce0 cf647d70 00000001 00000005 c01d2d30 000060da GPR08: 00000034 c0010920 00021032 c0008e24 cf646248 10074cf0 0fff2500 0ffe871c GPR16: 0ffb702c 0ffdf628 cf647e38 00008000 c032947c 10624dd3 00044b83 00000004 GPR24: c03e5098 cf647e4c c03b3350 00000007 cf647ec8 c03e5140 c03e513c 00000000 NIP [c0008e24] __ipipe_grab_irq+0x0/0xa4 LR [c0010920] __ipipe_ret_from_except+0x0/0xc Call Trace: [cf647e20] [c03e5140] 0xc03e5140 [cf647e30] [c0024d64] vprintk+0x2a0/0x344 [cf647ec0] [c0025310] printk+0x9c/0x1c0 [cf647f10] [c000cd8c] machine_check_4xx+0x28/0x84 [cf647f20] [c000d658] machine_check_exception+0x64/0x228 [cf647f40] [c0010624] ret_from_crit_exc+0x0/0x11c Instruction dump: 4804c1ed 2f830200 7c651b78 409e0014 80010014 38210010 7c0803a6 4e800020 3c60c032 38636190 38800200 4801af99 <9421fff0> 7c0802a6 93e1000c 90010014 Kernel panic - not syncing: Fatal exception I also tried rtdm_iomap_to_user() using the bus address returned by pci_alloc_consistent() with same result. In addition, access to DMA memory using 'mm' utility works. So it appears to be an issue with rtdm_mmap_to_user()/rtdm_iomap_to_user(). Is this usage correct/allowed? or should I use instead the memory heap services? Thanks, Luis Herrera-Bendezu
flex-am_defconfig
Description: flex-am_defconfig
_______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
