From 3b7d1921f4cdd6d6ddb7899ae7a8d413991c5cf4 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Wed, 4 Oct 2006 02:16:59 -0700 Subject: [PATCH] msi: refactor and move the msi irq_chip into the arch code It turns out msi_ops was simply not enough to abstract the architecture specific details of msi. So I have moved the resposibility of constructing the struct irq_chip to the architectures, and have two architecture specific functions arch_setup_msi_irq, and arch_teardown_msi_irq. For simple architectures those functions can do all of the work. For architectures with platform dependencies they can call into the appropriate platform code. With this msi.c is finally free of assuming you have an apic, and this actually takes less code. The helpers for the architecture specific code are declared in the linux/msi.h to keep them separate from the msi functions used by drivers in linux/pci.h Signed-off-by: Eric W. Biederman Cc: Ingo Molnar Cc: Tony Luck Cc: Andi Kleen Cc: Thomas Gleixner Cc: Greg KH Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/io_apic.c | 81 +++++++++++++++++++++++++++++++++------------- 1 file changed, 58 insertions(+), 23 deletions(-) (limited to 'arch/i386') diff --git a/arch/i386/kernel/io_apic.c b/arch/i386/kernel/io_apic.c index 100406b453b8..5a1252753dbb 100644 --- a/arch/i386/kernel/io_apic.c +++ b/arch/i386/kernel/io_apic.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include @@ -2455,11 +2456,8 @@ void destroy_irq(unsigned int irq) * MSI mesage composition */ #ifdef CONFIG_PCI_MSI -static int msi_msg_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) +static int msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) { - /* For now always this code always uses physical delivery - * mode. - */ int vector; unsigned dest; @@ -2489,34 +2487,71 @@ static int msi_msg_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg return vector; } -static void msi_msg_teardown(unsigned int irq) -{ - return; -} - -static void msi_msg_set_affinity(unsigned int irq, cpumask_t mask, struct msi_msg *msg) +#ifdef CONFIG_SMP +static void set_msi_irq_affinity(unsigned int irq, cpumask_t mask) { + struct msi_msg msg; + unsigned int dest; + cpumask_t tmp; int vector; - unsigned dest; + + cpus_and(tmp, mask, cpu_online_map); + if (cpus_empty(tmp)) + tmp = TARGET_CPUS; vector = assign_irq_vector(irq); - if (vector > 0) { - dest = cpu_mask_to_apicid(mask); + if (vector < 0) + return; - msg->data &= ~MSI_DATA_VECTOR_MASK; - msg->data |= MSI_DATA_VECTOR(vector); - msg->address_lo &= ~MSI_ADDR_DEST_ID_MASK; - msg->address_lo |= MSI_ADDR_DEST_ID(dest); - } + dest = cpu_mask_to_apicid(mask); + + read_msi_msg(irq, &msg); + + msg.data &= ~MSI_DATA_VECTOR_MASK; + msg.data |= MSI_DATA_VECTOR(vector); + msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK; + msg.address_lo |= MSI_ADDR_DEST_ID(dest); + + write_msi_msg(irq, &msg); + set_native_irq_info(irq, mask); } +#endif /* CONFIG_SMP */ -struct msi_ops arch_msi_ops = { - .needs_64bit_address = 0, - .setup = msi_msg_setup, - .teardown = msi_msg_teardown, - .target = msi_msg_set_affinity, +/* + * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices, + * which implement the MSI or MSI-X Capability Structure. + */ +static struct irq_chip msi_chip = { + .name = "PCI-MSI", + .unmask = unmask_msi_irq, + .mask = mask_msi_irq, + .ack = ack_ioapic_irq, +#ifdef CONFIG_SMP + .set_affinity = set_msi_irq_affinity, +#endif + .retrigger = ioapic_retrigger_irq, }; +int arch_setup_msi_irq(unsigned int irq, struct pci_dev *dev) +{ + struct msi_msg msg; + int ret; + ret = msi_compose_msg(dev, irq, &msg); + if (ret < 0) + return ret; + + write_msi_msg(irq, &msg); + + set_irq_chip_and_handler(irq, &msi_chip, handle_edge_irq); + + return 0; +} + +void arch_teardown_msi_irq(unsigned int irq) +{ + return; +} + #endif /* CONFIG_PCI_MSI */ /* -- cgit v1.2.3