Message ID | 1403166674-6836-1-git-send-email-wangyijing@huawei.com (mailing list archive) |
---|---|
State | New, archived |
Delegated to: | Bjorn Helgaas |
Headers | show |
On Thu, 19 Jun 2014, Yijing Wang wrote: > Maskbit in msi_attrib indicates MSI whether > support mask-pending bit. It is read only, > should save mask state in masked. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > --- > arch/s390/pci/pci.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c > index bdf0257..4651d6b 100644 > --- a/arch/s390/pci/pci.c > +++ b/arch/s390/pci/pci.c > @@ -263,7 +263,7 @@ static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag) > } else > return 0; > > - msi->msi_attrib.maskbit = !!flag; > + msi->masked = !!flag; > return 1; > } > > -- > 1.7.1 > > > Applied, thanks! Sebastian -- 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 Thu, Jun 19, 2014 at 04:31:14PM +0800, Yijing Wang wrote: > Maskbit in msi_attrib indicates MSI whether > support mask-pending bit. It is read only, > should save mask state in masked. > > Signed-off-by: Yijing Wang <wangyijing@huawei.com> > --- > arch/s390/pci/pci.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c > index bdf0257..4651d6b 100644 > --- a/arch/s390/pci/pci.c > +++ b/arch/s390/pci/pci.c > @@ -263,7 +263,7 @@ static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag) > } else > return 0; > > - msi->msi_attrib.maskbit = !!flag; > + msi->masked = !!flag; This doesn't look right. For MSI-X, you just overwrote the previous update of msi->masked: if (msi->msi_attrib.is_msix) { ... msi->masked = readl(msi->mask_base + offset); Maybe the update values end up being the same, but why do it twice? Also, the MSI mask bits are 32-bit field that can individually mask any subset of the 32 possible MSI vectors, and you collapsed this down to a single bit, so msi->masked no longer contains that information. Maybe none of this matters because all the zpci_msi_set_mask_bits() uses seem to be for a single bit, but the name says "mask_*bits*" and the msi->masked field is generic and covers multiple MSI vectors in general. > return 1; > } > > -- > 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
>> @@ -263,7 +263,7 @@ static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag) >> } else >> return 0; >> >> - msi->msi_attrib.maskbit = !!flag; >> + msi->masked = !!flag; > > This doesn't look right. For MSI-X, you just overwrote the previous update > of msi->masked: > > if (msi->msi_attrib.is_msix) { > ... > msi->masked = readl(msi->mask_base + offset); > > Maybe the update values end up being the same, but why do it twice? Hi Bjorn, this code is some difficult to understand. I guess it's for save MSI mask status, for MSI-X, do this twice, maybe this line should move up int to MSI if ()... Because I don't have the platform to test, so I do not want to change the code logic, what I am sure is save the flag status in msi->msi_attrib.maskbit is wrong. So I change this like: msi->masked = !!flag; Sebastian may know why do it like this. Besides, I think we can use MSI code driver interface mask_msi_irq() and unmask_msi_irq() to replace zpci_enable_irq() and zpci_disable_irq(). > > Also, the MSI mask bits are 32-bit field that can individually mask any > subset of the 32 possible MSI vectors, and you collapsed this down to a > single bit, so msi->masked no longer contains that information. > > Maybe none of this matters because all the zpci_msi_set_mask_bits() uses > seem to be for a single bit, but the name says "mask_*bits*" and the > msi->masked field is generic and covers multiple MSI vectors in general. Yes, it always uses single bit here, as you said, this code has some problems for multiple MSI, although it may does not use it. I will try to send a new patch fix the original problem. Thanks! Yijing. > >> return 1; >> } >> >> -- >> 1.7.1 >> >> > > . >
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index bdf0257..4651d6b 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -263,7 +263,7 @@ static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag) } else return 0; - msi->msi_attrib.maskbit = !!flag; + msi->masked = !!flag; return 1; }
Maskbit in msi_attrib indicates MSI whether support mask-pending bit. It is read only, should save mask state in masked. Signed-off-by: Yijing Wang <wangyijing@huawei.com> --- arch/s390/pci/pci.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)