Messages in this thread | | | Subject | host mastered 64 bit wide transfers to 64 bit PCI slot? | Date | Tue, 07 May 2002 10:24:04 -0700 | From | Galen Seitz <> |
| |
I have a custom 64 bit wide PCI card installed in a 64 bit slot. The card has an 8 MB prefetchable memory window available via BAR 0. Memory accesses work (/dev/mem and mmap), but I'm not seeing 64 bit wide transfers (req64, ack64 aren't toggling). How can I get the host/northbridge to generate 64 bit wide transfers?
I'm currently trying to do my testing from user space. Here's a snippet of code. The code leading up to this just reads from /proc/bus/pci/devices to get the BAR info. I run this code while holding a scope probe on /REQ64. Note that this is strictly a question about the width of data transfers. I'm not doing 64 bit addressing (no DAC cycles). Host info follows the code.
TIA, galen
if ((memfd = open("/dev/mem", O_RDWR)) < 0) perror("open /dev/mem"); function = 0; i = 0; pmem = mmap(0, size[function][i], PROT_READ | PROT_WRITE, MAP_SHARED, memfd, bar[function][i] & PCI_BASE_ADDRESS_MEM_MASK); if (pmem == MAP_FAILED) perror("mmap"); else printf("pmem = %08x\n", pmem);
memset(pmem, 0, size[function][i]); if (msync(pmem, size[function][i], MS_SYNC)) perror("msync");
for (offset = 0; offset < size[function][i]; offset += 8) { *(unsigned long long *)(pmem + offset) = offset; }
if (msync(pmem, size[function][i], MS_SYNC)) perror("msync");
for (offset = 0; offset < size[function][i]; offset += 8) { if (*(unsigned long long *)(pmem + offset) != offset) { printf("Error at %04x\n", offset); exit(1); } }
if (msync(pmem, size[function][i], MS_SYNC)) perror("msync");
if (munmap(0, size[function][i])) perror("munmap");
if (close(memfd)) perror("close");
The host is an ASUS A7M266-D motherboard (AMD 762 chipset) with a single 800 MHz Duron, and 256 MB DDR.
oz:/home/galens/jobs/45th/sw/pci# cat /proc/version Linux version 2.4.9-13 (bhcompile@stripples.devel.redhat.com) (gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-98)) #1 Tue Oct 30 19:32:27 EST 2001
oz:/home/galens/jobs/45th/sw/pci# /sbin/lspci 00:00.0 Host bridge: Advanced Micro Devices [AMD]: Unknown device 700c (rev 11) 00:01.0 PCI bridge: Advanced Micro Devices [AMD]: Unknown device 700d 00:07.0 ISA bridge: Advanced Micro Devices [AMD]: Unknown device 7440 (rev 04) 00:07.1 IDE interface: Advanced Micro Devices [AMD]: Unknown device 7441 (rev 04) 00:07.3 Bridge: Advanced Micro Devices [AMD]: Unknown device 7443 (rev 03) 00:09.0 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.1 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.2 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.3 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.4 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.5 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.6 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:09.7 Memory controller: Galileo Technology Ltd.: Unknown device 6430 (rev 10) 00:10.0 PCI bridge: Advanced Micro Devices [AMD]: Unknown device 7448 (rev 04) 01:05.0 VGA compatible controller: S3 Inc. Trio 64 3D (rev 01) 02:08.0 Ethernet controller: 3Com Corporation 3c900B-TPO [Etherlink XL TPO] (rev 04)
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |