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ntb: intel: remove b2b memory window workaround for Skylake NTB 

The workaround code is never used because Skylake NTB does not need it.

Reported-by: Allen Hubbe <allen.hubbe@dell.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Dave Jiang 2017-11-10 16:45:27 -07:00 committed by Jon Mason
parent 3a814a04e6
commit 4201a9918c
1 changed files with 2 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
drivers/ntb/hw/intel/ntb_hw_intel.c
View File

@ -1742,89 +1742,18 @@ static int skx_setup_b2b_mw(struct intel_ntb_dev *ndev,
{
struct pci_dev *pdev;
void __iomem *mmio;
resource_size_t bar_size;
phys_addr_t bar_addr;
int b2b_bar;
u8 bar_sz;
pdev = ndev->ntb.pdev;
mmio = ndev->self_mmio;
if (ndev->b2b_idx == UINT_MAX) {
dev_dbg(&pdev->dev, "not using b2b mw\n");
b2b_bar = 0;
ndev->b2b_off = 0;
} else {
b2b_bar = ndev_mw_to_bar(ndev, ndev->b2b_idx);
if (b2b_bar < 0)
return -EIO;
dev_dbg(&pdev->dev, "using b2b mw bar %d\n", b2b_bar);
bar_size = pci_resource_len(ndev->ntb.pdev, b2b_bar);
dev_dbg(&pdev->dev, "b2b bar size %#llx\n", bar_size);
if (b2b_mw_share && ((bar_size >> 1) >= XEON_B2B_MIN_SIZE)) {
dev_dbg(&pdev->dev, "b2b using first half of bar\n");
ndev->b2b_off = bar_size >> 1;
} else if (bar_size >= XEON_B2B_MIN_SIZE) {
dev_dbg(&pdev->dev, "b2b using whole bar\n");
ndev->b2b_off = 0;
--ndev->mw_count;
} else {
dev_dbg(&pdev->dev, "b2b bar size is too small\n");
return -EIO;
}
}
/*
* Reset the secondary bar sizes to match the primary bar sizes,
* except disable or halve the size of the b2b secondary bar.
*/
pci_read_config_byte(pdev, SKX_IMBAR1SZ_OFFSET, &bar_sz);
dev_dbg(&pdev->dev, "IMBAR1SZ %#x\n", bar_sz);
if (b2b_bar == 1) {
if (ndev->b2b_off)
bar_sz -= 1;
else
bar_sz = 0;
}
pci_write_config_byte(pdev, SKX_EMBAR1SZ_OFFSET, bar_sz);
pci_read_config_byte(pdev, SKX_EMBAR1SZ_OFFSET, &bar_sz);
dev_dbg(&pdev->dev, "EMBAR1SZ %#x\n", bar_sz);
pci_read_config_byte(pdev, SKX_IMBAR2SZ_OFFSET, &bar_sz);
dev_dbg(&pdev->dev, "IMBAR2SZ %#x\n", bar_sz);
if (b2b_bar == 2) {
if (ndev->b2b_off)
bar_sz -= 1;
else
bar_sz = 0;
}
pci_write_config_byte(pdev, SKX_EMBAR2SZ_OFFSET, bar_sz);
pci_read_config_byte(pdev, SKX_EMBAR2SZ_OFFSET, &bar_sz);
dev_dbg(&pdev->dev, "EMBAR2SZ %#x\n", bar_sz);
/* SBAR01 hit by first part of the b2b bar */
if (b2b_bar == 0)
bar_addr = addr->bar0_addr;
else if (b2b_bar == 1)
bar_addr = addr->bar2_addr64;
else if (b2b_bar == 2)
bar_addr = addr->bar4_addr64;
else
return -EIO;
/* setup incoming bar limits == base addrs (zero length windows) */
bar_addr = addr->bar2_addr64 + (b2b_bar == 1 ? ndev->b2b_off : 0);
bar_addr = addr->bar2_addr64;
iowrite64(bar_addr, mmio + SKX_IMBAR1XLMT_OFFSET);
bar_addr = ioread64(mmio + SKX_IMBAR1XLMT_OFFSET);
dev_dbg(&pdev->dev, "IMBAR1XLMT %#018llx\n", bar_addr);
bar_addr = addr->bar4_addr64 + (b2b_bar == 2 ? ndev->b2b_off : 0);
bar_addr = addr->bar4_addr64;
iowrite64(bar_addr, mmio + SKX_IMBAR2XLMT_OFFSET);
bar_addr = ioread64(mmio + SKX_IMBAR2XLMT_OFFSET);
dev_dbg(&pdev->dev, "IMBAR2XLMT %#018llx\n", bar_addr);