Hello, Thank you for your reply. I am not implementing either a "block" or "char" driver but rather a PCI device driver based on "pci_skel.c" from the "Linux Device Drivers, 3rd edition" book. "pci_skel.c" has "probe()", "remove()", "init()", and "exit()" functions only and no "ioctl" functionality. It is unclear to me how I can use a function like "copy_to_user()" that requires a user-space destination address with this type of driver.....Any suggestions? Thank you -----Original Message----- From: Bernd Petrovitsch [mailto:bernd@xxxxxxxxx] Sent: Wednesday, January 11, 2006 4:40 PM To: Medeiros Edward M NPRI Cc: 'kernelnewbies@xxxxxxxxxxxx' Subject: Re: Passing user-space addr. to PCI driver? On Wed, 2006-01-11 at 15:45 -0500, Medeiros Edward M NPRI wrote: [...] > I need to perform a "copy_to_user()" call in my PCI device driver. I > need to do this to make available the data acquired by my PCI device > to a user-space DSP routine. "copy_to_user()" has an input > parameter that is the address of the user-space buffer My question > is how can I pass this user-space buffer address to my PCI device > driver? Alternatively, if I get_user_pages in my device driver and User-space is doing a read(2), write(2), mmap(2) or ioctl(2) call where it may/must pass the buffers address and the size. You are probably implementing a char or block device driver for this secret PCI card. Your block/char driver has to provide some functions ahich are called for open(2) and several other sys-calls (including the above mentioned ones) and there you get the user-space pointer. See Rubini's book for simple char and block drivers (or in the kernel source). Bernd -- Firmix Software GmbH http://www.firmix.at/ mobil: +43 664 4416156 fax: +43 1 7890849-55 Embedded Linux Development and Services -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
