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PCI/MSI: Cache Multiple Message Capable in struct msi_desc

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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>
This commit is contained in:
Yijing Wang
2014-06-19 16:30:30 +08:00
committed by Bjorn Helgaas
parent 199596ef91
commit 31ea5d4dfe
2 changed files with 7 additions and 11 deletions
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3
include/linux/msi.h
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@@ -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 */