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[SCSI] bfa: Use pcie_set()/get_readrq() to simplify code 

Use pcie_get_readrq()/pcie_set_readrq() to simplify code.

Jon Mason proposed a similar patch a couple years ago (see below).

[bhelgaas: validate pcie_max_read_reqsz, add pointer to Jon's patch]
Reference: http://lkml.kernel.org/r/1309191190-14670-1-git-send-email-jdmason@kudzu.us
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Anil Gurumurthy <agurumur@brocade.com>
Cc: Vijaya Mohan Guvva <vmohan@brocade.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
This commit is contained in:
Yijing Wang 2013-09-05 15:55:25 +08:00 committed by Bjorn Helgaas
parent f8a26fe637
commit c0102c00d8
1 changed files with 12 additions and 41 deletions
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53
drivers/scsi/bfa/bfad.c
View File

@ -766,49 +766,20 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad)
bfad->pcidev = pdev;
/* Adjust PCIe Maximum Read Request Size */
if (pcie_max_read_reqsz > 0) {
int pcie_cap_reg;
u16 pcie_dev_ctl;
u16 mask = 0xffff;
switch (pcie_max_read_reqsz) {
case 128:
mask = 0x0;
break;
case 256:
mask = 0x1000;
break;
case 512:
mask = 0x2000;
break;
case 1024:
mask = 0x3000;
break;
case 2048:
mask = 0x4000;
break;
case 4096:
mask = 0x5000;
break;
default:
break;
}
pcie_cap_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP);
if (mask != 0xffff && pcie_cap_reg) {
pcie_cap_reg += 0x08;
pci_read_config_word(pdev, pcie_cap_reg, &pcie_dev_ctl);
if ((pcie_dev_ctl & 0x7000) != mask) {
printk(KERN_WARNING "BFA[%s]: "
if (pci_is_pcie(pdev) && pcie_max_read_reqsz) {
if (pcie_max_read_reqsz >= 128 &&
pcie_max_read_reqsz <= 4096 &&
is_power_of_2(pcie_max_read_reqsz)) {
int max_rq = pcie_get_readrq(pdev);
printk(KERN_WARNING "BFA[%s]: "
"pcie_max_read_request_size is %d, "
"reset to %d\n", bfad->pci_name,
(1 << ((pcie_dev_ctl & 0x7000) >> 12)) << 7,
"reset to %d\n", bfad->pci_name, max_rq,
pcie_max_read_reqsz);
pcie_dev_ctl &= ~0x7000;
pci_write_config_word(pdev, pcie_cap_reg,
pcie_dev_ctl | mask);
}
pcie_set_readrq(pdev, pcie_max_read_reqsz);
} else {
printk(KERN_WARNING "BFA[%s]: invalid "
"pcie_max_read_request_size %d ignored\n",
bfad->pci_name, pcie_max_read_reqsz);
}
}