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ahci: per-port msix support

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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>
This commit is contained in:
Dan Williams
2015-11-11 16:27:33 -08:00
committed by Tejun Heo
parent 4d92f0099a
commit d684a90d38
3 changed files with 61 additions and 27 deletions
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19
drivers/ata/libahci.c
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@@ -43,6 +43,7 @@
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include <linux/pci.h>
#include "ahci.h"
#include "libata.h"
@@ -2470,9 +2471,10 @@ void ahci_set_em_messages(struct ahci_host_priv *hpriv,
}
EXPORT_SYMBOL_GPL(ahci_set_em_messages);
static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
static int ahci_host_activate_multi_irqs(struct ata_host *host,
struct scsi_host_template *sht)
{
struct ahci_host_priv *hpriv = host->private_data;
int i, rc;
rc = ata_host_start(host);
@@ -2484,6 +2486,12 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
*/
for (i = 0; i < host->n_ports; i++) {
struct ahci_port_priv *pp = host->ports[i]->private_data;
int irq;
if (hpriv->flags & AHCI_HFLAG_MULTI_MSIX)
irq = hpriv->msix[i].vector;
else
irq = hpriv->irq + i;
/* Do not receive interrupts sent by dummy ports */
if (!pp) {
@@ -2491,14 +2499,15 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
continue;
}
rc = devm_request_threaded_irq(host->dev, irq + i,
rc = devm_request_threaded_irq(host->dev, irq,
ahci_multi_irqs_intr,
ahci_port_thread_fn, 0,
pp->irq_desc, host->ports[i]);
if (rc)
return rc;
ata_port_desc(host->ports[i], "irq %d", irq + i);
ata_port_desc(host->ports[i], "irq %d", irq);
}
return ata_host_register(host, sht);
}
@@ -2519,8 +2528,8 @@ int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht)
int irq = hpriv->irq;
int rc;
if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
rc = ahci_host_activate_multi_irqs(host, irq, sht);
if (hpriv->flags & (AHCI_HFLAG_MULTI_MSI | AHCI_HFLAG_MULTI_MSIX))
rc = ahci_host_activate_multi_irqs(host, sht);
else if (hpriv->flags & AHCI_HFLAG_EDGE_IRQ)
rc = ata_host_activate(host, irq, ahci_single_edge_irq_intr,
IRQF_SHARED, sht);