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authorDan Williams <dan.j.williamps@intel.com>2015-11-11 16:27:33 -0800
committerTejun Heo <tj@kernel.org>2015-11-16 11:29:10 -0500
commitd684a90d38e24dcaf95fdb32c83efe05f80d152a (patch)
tree855bb8396232c9b682394125c46ada2671452bca /drivers/ata/ahci.h
parent4d92f0099a06ef0e36c7673f7c090f1a448b2d1b (diff)
ahci: per-port msix support
Some AHCI controllers support per-port MSI-X vectors. At the same time the Linux AHCI driver needs to support one-off architectures that implement a single MSI-X vector for all ports. The heuristic for enabling AHCI ports becomes, in order of preference: 1/ per-port multi-MSI-X 2/ per-port multi-MSI 3/ single MSI 4/ single MSI-X 5/ legacy INTX This all depends on AHCI implementations with potentially broken MSI-X requesting less vectors than the number of ports. If this assumption is violated we will need to start explicitly white-listing AHCI-MSIX implementations. Reported-by: Ricardo Neri <ricardo.neri@intel.com> [ricardo: fix struct msix_entry handling] Reported-by: kernel test robot <ying.huang@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata/ahci.h')
-rw-r--r--drivers/ata/ahci.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 45586c1dbbdc..9e60c50b2103 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -242,6 +242,7 @@ enum {
AHCI_HFLAG_NO_FBS = (1 << 18), /* no FBS */
AHCI_HFLAG_EDGE_IRQ = (1 << 19), /* HOST_IRQ_STAT behaves as
Edge Triggered */
+ AHCI_HFLAG_MULTI_MSIX = (1 << 20), /* per-port MSI-X */
/* ap->flags bits */
@@ -343,6 +344,7 @@ struct ahci_host_priv {
* the PHY position in this array.
*/
struct phy **phys;
+ struct msix_entry *msix; /* Optional MSI-X support */
unsigned nports; /* Number of ports */
void *plat_data; /* Other platform data */
unsigned int irq; /* interrupt line */