| Message ID | 1378193715-25328-1-git-send-email-wangyijing@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Tue, Sep 03, 2013 at 03:35:09PM +0800, Yijing Wang wrote: > Pcie_capability_xxx() interfaces were introudced to > simplify code to access PCIe Cap config space. And > because PCI core saves the PCIe Cap offset in > set_pcie_port_type() when device is enumerated. > So we can use pci_is_pcie() instead. > > Signed-off-by: Yijing Wang <wangyijing@huawei.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> > Cc: linux-scsi@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > --- > drivers/scsi/bfa/bfad.c | 9 +++------ > 1 files changed, 3 insertions(+), 6 deletions(-) > > diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c > index 9611195..d726b81 100644 > --- a/drivers/scsi/bfa/bfad.c > +++ b/drivers/scsi/bfa/bfad.c > @@ -767,7 +767,6 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) > > /* Adjust PCIe Maximum Read Request Size */ > if (pcie_max_read_reqsz > 0) { > - int pcie_cap_reg; > u16 pcie_dev_ctl; > u16 mask = 0xffff; > > @@ -794,10 +793,8 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) > 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 (mask != 0xffff && pci_is_pcie(pdev)) { Please move the pci_is_pcie() test up to the "if (pcie_mas_read_reqsz ..." statement. There's no point in doing the switch statement if this isn't a PCIe device. > + pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctl); > if ((pcie_dev_ctl & 0x7000) != mask) { > printk(KERN_WARNING "BFA[%s]: " > "pcie_max_read_request_size is %d, " > @@ -806,7 +803,7 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) > pcie_max_read_reqsz); > > pcie_dev_ctl &= ~0x7000; > - pci_write_config_word(pdev, pcie_cap_reg, > + pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, > pcie_dev_ctl | mask); Please rework this to use pcie_set_readrq() instead of writing the capability directly. If we write the capability directly, we risk writing a value that is incompatible with the MPS configuration done by the PCI core. > } > } > -- > 1.7.1 > > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Sep 3, 2013 at 5:34 PM, Bjorn Helgaas <bhelgaas@google.com> wrote: > On Tue, Sep 03, 2013 at 03:35:09PM +0800, Yijing Wang wrote: >> Pcie_capability_xxx() interfaces were introudced to >> simplify code to access PCIe Cap config space. And >> because PCI core saves the PCIe Cap offset in >> set_pcie_port_type() when device is enumerated. >> So we can use pci_is_pcie() instead. >> >> Signed-off-by: Yijing Wang <wangyijing@huawei.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> >> Cc: linux-scsi@vger.kernel.org >> Cc: linux-kernel@vger.kernel.org >> --- >> drivers/scsi/bfa/bfad.c | 9 +++------ >> 1 files changed, 3 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c >> index 9611195..d726b81 100644 >> --- a/drivers/scsi/bfa/bfad.c >> +++ b/drivers/scsi/bfa/bfad.c >> @@ -767,7 +767,6 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) >> >> /* Adjust PCIe Maximum Read Request Size */ >> if (pcie_max_read_reqsz > 0) { >> - int pcie_cap_reg; >> u16 pcie_dev_ctl; >> u16 mask = 0xffff; >> >> @@ -794,10 +793,8 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) >> 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 (mask != 0xffff && pci_is_pcie(pdev)) { > > Please move the pci_is_pcie() test up to the > "if (pcie_mas_read_reqsz ..." statement. There's no point in doing > the switch statement if this isn't a PCIe device. > >> + pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctl); >> if ((pcie_dev_ctl & 0x7000) != mask) { I forgot to mention that this 0x7000 constant should be PCI_EXP_DEVCTL_READRQ instead. >> printk(KERN_WARNING "BFA[%s]: " >> "pcie_max_read_request_size is %d, " >> @@ -806,7 +803,7 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) >> pcie_max_read_reqsz); >> >> pcie_dev_ctl &= ~0x7000; >> - pci_write_config_word(pdev, pcie_cap_reg, >> + pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, >> pcie_dev_ctl | mask); > > Please rework this to use pcie_set_readrq() instead of writing > the capability directly. If we write the capability directly, we > risk writing a value that is incompatible with the MPS > configuration done by the PCI core. > >> } >> } >> -- >> 1.7.1 >> >> -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
>> @@ -794,10 +793,8 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) >> 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 (mask != 0xffff && pci_is_pcie(pdev)) { > > Please move the pci_is_pcie() test up to the > "if (pcie_mas_read_reqsz ..." statement. There's no point in doing > the switch statement if this isn't a PCIe device. Right, will update. > >> + pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctl); >> if ((pcie_dev_ctl & 0x7000) != mask) { >> printk(KERN_WARNING "BFA[%s]: " >> "pcie_max_read_request_size is %d, " >> @@ -806,7 +803,7 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) >> pcie_max_read_reqsz); >> >> pcie_dev_ctl &= ~0x7000; >> - pci_write_config_word(pdev, pcie_cap_reg, >> + pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, >> pcie_dev_ctl | mask); > > Please rework this to use pcie_set_readrq() instead of writing > the capability directly. If we write the capability directly, we > risk writing a value that is incompatible with the MPS > configuration done by the PCI core. Ah, this code is Long-winded, use pcie_set_readrq()/pcie_get_readrq() can simplify this code much. Thanks! Yijing. > >> } >> } >> -- >> 1.7.1 >> >> > > . >
diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c index 9611195..d726b81 100644 --- a/drivers/scsi/bfa/bfad.c +++ b/drivers/scsi/bfa/bfad.c @@ -767,7 +767,6 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) /* Adjust PCIe Maximum Read Request Size */ if (pcie_max_read_reqsz > 0) { - int pcie_cap_reg; u16 pcie_dev_ctl; u16 mask = 0xffff; @@ -794,10 +793,8 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) 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 (mask != 0xffff && pci_is_pcie(pdev)) { + pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &pcie_dev_ctl); if ((pcie_dev_ctl & 0x7000) != mask) { printk(KERN_WARNING "BFA[%s]: " "pcie_max_read_request_size is %d, " @@ -806,7 +803,7 @@ bfad_pci_init(struct pci_dev *pdev, struct bfad_s *bfad) pcie_max_read_reqsz); pcie_dev_ctl &= ~0x7000; - pci_write_config_word(pdev, pcie_cap_reg, + pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, pcie_dev_ctl | mask); } }
Pcie_capability_xxx() interfaces were introudced to simplify code to access PCIe Cap config space. And because PCI core saves the PCIe Cap offset in set_pcie_port_type() when device is enumerated. So we can use pci_is_pcie() instead. Signed-off-by: Yijing Wang <wangyijing@huawei.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> Cc: linux-scsi@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- drivers/scsi/bfa/bfad.c | 9 +++------ 1 files changed, 3 insertions(+), 6 deletions(-)