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| author | Yijing Wang <wangyijing@huawei.com> | 2014-06-19 16:30:30 +0800 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-07-03 16:55:07 -0600 |
| commit | 31ea5d4dfe21fb50276dcd70ce268e58d57eccb4 (patch) | |
| tree | e8831d2a1ea82d5b70f19044ade5f56746d92580 /include/linux/msi.h | |
| parent | 199596ef9184ab2bc0eb43d1af9e0b723ce07840 (diff) | |
| download | op-kernel-dev-31ea5d4dfe21fb50276dcd70ce268e58d57eccb4.zip op-kernel-dev-31ea5d4dfe21fb50276dcd70ce268e58d57eccb4.tar.gz | |
PCI/MSI: Cache Multiple Message Capable in struct msi_desc
The Multiple Message Capable field in the MSI Message Control register
indicates how many vectors the device supports. This field is read-only,
so cache it in msi_desc to avoid reading it repeatedly.
Since we cache the extracted field (not the entire Message Control
register), we can use msi_mask() instead of msi_capable_mask(), which is
then unused, so remove it.
[bhelgaas: fix whitespace, changelog]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include/linux/msi.h')
| -rw-r--r-- | include/linux/msi.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h index 92a2f99..8103f32 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -25,7 +25,8 @@ void write_msi_msg(unsigned int irq, struct msi_msg *msg); struct msi_desc { struct { __u8 is_msix : 1; - __u8 multiple: 3; /* log2 number of messages */ + __u8 multiple: 3; /* log2 num of messages allocated */ + __u8 multi_cap : 3; /* log2 num of messages supported */ __u8 maskbit : 1; /* mask-pending bit supported ? */ __u8 is_64 : 1; /* Address size: 0=32bit 1=64bit */ __u8 pos; /* Location of the msi capability */ |
