korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-11 12:28:41 +08:00
Code Issues Packages Projects Releases Wiki Activity

[PARISC] Document that we tolerate "Relaxed Ordering"

Browse Source 
This means "DMA Read returns" can bypass "MMIO Writes".
Violating the PCI specs in this case improves outbound DMA "flows"
and is currently not required by any drivers.

This is NOT a new behavior. Previous chipsets did this
already and I believe ZX1 PDC was already setting this
for hpux. I just want to further document the behavior.

Signed-off-by: Grant Grundler <grundler@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Grant Grundler 2006-03-30 07:13:21 +00:00 committed by Kyle McMartin
parent 67a5a59d33
commit b312c33e36
1 changed files with 31 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/parisc/sba_iommu.c
View File

@ -178,6 +178,11 @@ extern struct proc_dir_entry * proc_mckinley_root;
#define ROPE6_CTL 0x230
#define ROPE7_CTL 0x238
#define IOC_ROPE0_CFG 0x500 /* pluto only */
#define IOC_ROPE_AO 0x10 /* Allow "Relaxed Ordering" */
#define HF_ENABLE 0x40
@ -1759,19 +1764,33 @@ printk("sba_hw_init(): mem_boot 0x%x 0x%x 0x%x 0x%x\n", PAGE0->mem_boot.hpa,
sba_dev->num_ioc = num_ioc;
for (i = 0; i < num_ioc; i++) {
/*
** Make sure the box crashes if we get any errors on a rope.
*/
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE0_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE1_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE2_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE3_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE4_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE5_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE6_CTL);
WRITE_REG(HF_ENABLE, sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
unsigned long ioc_hpa = sba_dev->ioc[i].ioc_hpa;
unsigned int j;
/* flush out the writes */
for (j=0; j < sizeof(u64) * ROPES_PER_IOC; j+=sizeof(u64)) {
/*
* Clear ROPE(N)_CONFIG AO bit.
* Disables "NT Ordering" (~= !"Relaxed Ordering")
* Overrides bit 1 in DMA Hint Sets.
* Improves netperf UDP_STREAM by ~10% for bcm5701.
*/
if (IS_PLUTO(sba_dev->iodc)) {
unsigned long rope_cfg, cfg_val;
rope_cfg = ioc_hpa + IOC_ROPE0_CFG + j;
cfg_val = READ_REG(rope_cfg);
cfg_val &= ~IOC_ROPE_AO;
WRITE_REG(cfg_val, rope_cfg);
}
/*
** Make sure the box crashes on rope errors.
*/
WRITE_REG(HF_ENABLE, ioc_hpa + ROPE0_CTL + j);
}
/* flush out the last writes */
READ_REG(sba_dev->ioc[i].ioc_hpa + ROPE7_CTL);
DBG_INIT(" ioc[%d] ROPE_CFG 0x%Lx ROPE_DBG 0x%Lx\n",