MIPS: Octeon: Make MSI use handle_simple_irq().

The use of handle_percpu_irq() is not really what we want for MSI, use
handle_simple_irq() instead.  This is probably the prototypical case
for using handle_simple_irq(), because all the MSIs are dispatched from
the root interrupt service routine.

Also since the base IRQ is not shared, don't pass IRQF_SHARED.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1488/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/pci/msi-octeon.c b/arch/mips/pci/msi-octeon.c
index 5ce1a6a6494af736dfde95ba80f54f709ac146e9..83ceb52d6e0e8d39d0fcda7b7f2cb2b39f7a79c7 100644 (file)
--- a/arch/mips/pci/msi-octeon.c
+++ b/arch/mips/pci/msi-octeon.c
@@ -228,22 +228,20 @@ static irqreturn_t octeon_msi_interrupt(int cpl, void *dev_id)
        irq = fls64(msi_bits);
        if (irq) {
                irq += OCTEON_IRQ_MSI_BIT0 - 1;
+               if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
+                       /* These chips have PCIe */
+                       cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
+                                      1ull << (irq - OCTEON_IRQ_MSI_BIT0));
+               } else {
+                       /* These chips have PCI */
+                       cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
+                                      1ull << (irq - OCTEON_IRQ_MSI_BIT0));
+               }
                if (irq_desc[irq].action) {
                        do_IRQ(irq);
                        return IRQ_HANDLED;
                } else {
                        pr_err("Spurious MSI interrupt %d\n", irq);
-                       if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
-                               /* These chips have PCIe */
-                               cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
-                                              1ull << (irq -
-                                                       OCTEON_IRQ_MSI_BIT0));
-                       } else {
-                               /* These chips have PCI */
-                               cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
-                                              1ull << (irq -
-                                                       OCTEON_IRQ_MSI_BIT0));
-                       }
                }
        }
        return IRQ_NONE;
@@ -251,27 +249,6 @@ static irqreturn_t octeon_msi_interrupt(int cpl, void *dev_id)
 
 static DEFINE_RAW_SPINLOCK(octeon_irq_msi_lock);
 
-static void octeon_irq_msi_ack(unsigned int irq)
-{
-       if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
-               /* These chips have PCI */
-               cvmx_write_csr(CVMX_NPI_NPI_MSI_RCV,
-                              1ull << (irq - OCTEON_IRQ_MSI_BIT0));
-       } else {
-               /*
-                * These chips have PCIe. Thankfully the ACK doesn't
-                * need any locking.
-                */
-               cvmx_write_csr(CVMX_PEXP_NPEI_MSI_RCV0,
-                              1ull << (irq - OCTEON_IRQ_MSI_BIT0));
-       }
-}
-
-static void octeon_irq_msi_eoi(unsigned int irq)
-{
-       /* Nothing needed */
-}
-
 static void octeon_irq_msi_enable(unsigned int irq)
 {
        if (!octeon_has_feature(OCTEON_FEATURE_PCIE)) {
@@ -326,8 +303,6 @@ static struct irq_chip octeon_irq_chip_msi = {
        .name = "MSI",
        .enable = octeon_irq_msi_enable,
        .disable = octeon_irq_msi_disable,
-       .ack = octeon_irq_msi_ack,
-       .eoi = octeon_irq_msi_eoi,
 };
 
 /*
@@ -338,34 +313,28 @@ static int __init octeon_msi_initialize(void)
        int irq;
 
        for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_LAST; irq++) {
-               set_irq_chip_and_handler(irq, &octeon_irq_chip_msi,
-                                        handle_percpu_irq);
+               set_irq_chip_and_handler(irq, &octeon_irq_chip_msi, handle_simple_irq);
        }
 
        if (octeon_has_feature(OCTEON_FEATURE_PCIE)) {
                if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
-                               IRQF_SHARED,
-                               "MSI[0:63]", octeon_msi_interrupt))
+                               0, "MSI[0:63]", octeon_msi_interrupt))
                        panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed");
        } else if (octeon_is_pci_host()) {
                if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt,
-                               IRQF_SHARED,
-                               "MSI[0:15]", octeon_msi_interrupt))
+                               0, "MSI[0:15]", octeon_msi_interrupt))
                        panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed");
 
                if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt,
-                               IRQF_SHARED,
-                               "MSI[16:31]", octeon_msi_interrupt))
+                               0, "MSI[16:31]", octeon_msi_interrupt))
                        panic("request_irq(OCTEON_IRQ_PCI_MSI1) failed");
 
                if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt,
-                               IRQF_SHARED,
-                               "MSI[32:47]", octeon_msi_interrupt))
+                               0, "MSI[32:47]", octeon_msi_interrupt))
                        panic("request_irq(OCTEON_IRQ_PCI_MSI2) failed");
 
                if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt,
-                               IRQF_SHARED,
-                               "MSI[48:63]", octeon_msi_interrupt))
+                               0, "MSI[48:63]", octeon_msi_interrupt))
                        panic("request_irq(OCTEON_IRQ_PCI_MSI3) failed");
 
        }