ahci: compile out msi/msix infrastructure

Quoting Arnd:
The AHCI driver is used for some on-chip devices that do not use PCI
for probing, and it can be built even when CONFIG_PCI is disabled, but
that now results in a build failure:

ata/libahci.c: In function 'ahci_host_activate_multi_irqs':
ata/libahci.c:2475:4: error: invalid use of undefined type 'struct msix_entry'
ata/libahci.c:2475:21: error: dereferencing pointer to incomplete type 'struct msix_entry'

Add ifdef CONFIG_PCI_MSI infrastructure to compile out the multi-msi and
multi-msix code.

Reported-by: Arnd Bergmann <[e-mail]>
Tested--by: Arnd Bergmann <[e-mail]>
[arnd: fix up pci enabled case]
Reported-by: Paul Gortmaker <[e-mail]>
Fixes: d684a90d38e2 ("ahci: per-port msix support")
Signed-off-by: Dan Williams <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

drivers/ata/ahci.h

···
 #ifndef _AHCI_H
 #define _AHCI_H
 
+#include <linux/pci.h>
 #include <linux/clk.h>
 #include <linux/libata.h>
 #include <linux/phy/phy.h>
···
 	AHCI_HFLAG_DELAY_ENGINE		= (1 << 15), /* do not start engine on
 						        port start (wait until
 						        error-handling stage) */
-	AHCI_HFLAG_MULTI_MSI		= (1 << 16), /* multiple PCI MSIs */
 	AHCI_HFLAG_NO_DEVSLP		= (1 << 17), /* no device sleep */
 	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 */
+#ifdef CONFIG_PCI_MSI
+	AHCI_HFLAG_MULTI_MSI		= (1 << 20), /* multiple PCI MSIs */
+	AHCI_HFLAG_MULTI_MSIX		= (1 << 21), /* per-port MSI-X */
+#else
+	/* compile out MSI infrastructure */
+	AHCI_HFLAG_MULTI_MSI		= 0,
+	AHCI_HFLAG_MULTI_MSIX		= 0,
+#endif
 
 	/* ap->flags bits */
 
···
 	 */
 	void			(*start_engine)(struct ata_port *ap);
 };
+
+#ifdef CONFIG_PCI_MSI
+static inline int ahci_irq_vector(struct ahci_host_priv *hpriv, int port)
+{
+	if (hpriv->flags & AHCI_HFLAG_MULTI_MSIX)
+		return hpriv->msix[port].vector;
+	else
+		return hpriv->irq + port;
+}
+#else
+static inline int ahci_irq_vector(struct ahci_host_priv *hpriv, int port)
+{
+	return hpriv->irq;
+}
+#endif
 
 extern int ahci_ignore_sss;
 

drivers/ata/libahci.c

···
 	 */
 	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;
+		int irq = ahci_irq_vector(hpriv, i);
 
 		/* Do not receive interrupts sent by dummy ports */
 		if (!pp) {