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0366f8f713
In support of this I also add a struct msi_msg that captures the the two address and one data field ina typical msi message, and I remember the pos and if the address is 64bit in struct msi_desc. This makes the code a little more readable and easier to maintain, and paves the way to further simplfications. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Rajesh Shah <rajesh.shah@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1265 lines
32 KiB
C
1265 lines
32 KiB
C
/*
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* File: msi.c
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* Purpose: PCI Message Signaled Interrupt (MSI)
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*
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* Copyright (C) 2003-2004 Intel
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* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
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*/
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#include <linux/mm.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/smp_lock.h>
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#include <linux/pci.h>
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#include <linux/proc_fs.h>
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#include <asm/errno.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include "pci.h"
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#include "msi.h"
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static DEFINE_SPINLOCK(msi_lock);
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static struct msi_desc* msi_desc[NR_IRQS] = { [0 ... NR_IRQS-1] = NULL };
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static kmem_cache_t* msi_cachep;
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static int pci_msi_enable = 1;
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static int last_alloc_vector;
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static int nr_released_vectors;
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static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS;
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static int nr_msix_devices;
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#ifndef CONFIG_X86_IO_APIC
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int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
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#endif
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static struct msi_ops *msi_ops;
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int
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msi_register(struct msi_ops *ops)
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{
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msi_ops = ops;
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return 0;
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}
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static int msi_cache_init(void)
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{
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msi_cachep = kmem_cache_create("msi_cache", sizeof(struct msi_desc),
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0, SLAB_HWCACHE_ALIGN, NULL, NULL);
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if (!msi_cachep)
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return -ENOMEM;
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return 0;
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}
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static void msi_set_mask_bit(unsigned int vector, int flag)
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{
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struct msi_desc *entry;
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entry = (struct msi_desc *)msi_desc[vector];
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if (!entry || !entry->dev || !entry->mask_base)
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return;
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switch (entry->msi_attrib.type) {
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case PCI_CAP_ID_MSI:
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{
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int pos;
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u32 mask_bits;
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pos = (long)entry->mask_base;
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pci_read_config_dword(entry->dev, pos, &mask_bits);
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mask_bits &= ~(1);
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mask_bits |= flag;
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pci_write_config_dword(entry->dev, pos, mask_bits);
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break;
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}
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case PCI_CAP_ID_MSIX:
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{
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int offset = entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
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PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET;
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writel(flag, entry->mask_base + offset);
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break;
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}
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default:
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break;
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}
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}
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static void read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
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{
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switch(entry->msi_attrib.type) {
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case PCI_CAP_ID_MSI:
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{
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struct pci_dev *dev = entry->dev;
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int pos = entry->msi_attrib.pos;
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u16 data;
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pci_read_config_dword(dev, msi_lower_address_reg(pos),
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&msg->address_lo);
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if (entry->msi_attrib.is_64) {
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pci_read_config_dword(dev, msi_upper_address_reg(pos),
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&msg->address_hi);
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pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
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} else {
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msg->address_hi = 0;
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pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
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}
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msg->data = data;
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break;
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}
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case PCI_CAP_ID_MSIX:
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{
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void __iomem *base;
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base = entry->mask_base +
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entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
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msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
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msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
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msg->data = readl(base + PCI_MSIX_ENTRY_DATA_OFFSET);
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break;
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}
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default:
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BUG();
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}
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}
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static void write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
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{
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switch (entry->msi_attrib.type) {
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case PCI_CAP_ID_MSI:
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{
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struct pci_dev *dev = entry->dev;
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int pos = entry->msi_attrib.pos;
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pci_write_config_dword(dev, msi_lower_address_reg(pos),
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msg->address_lo);
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if (entry->msi_attrib.is_64) {
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pci_write_config_dword(dev, msi_upper_address_reg(pos),
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msg->address_hi);
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pci_write_config_word(dev, msi_data_reg(pos, 1),
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msg->data);
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} else {
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pci_write_config_word(dev, msi_data_reg(pos, 0),
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msg->data);
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}
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break;
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}
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case PCI_CAP_ID_MSIX:
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{
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void __iomem *base;
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base = entry->mask_base +
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entry->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
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writel(msg->address_lo,
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base + PCI_MSIX_ENTRY_LOWER_ADDR_OFFSET);
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writel(msg->address_hi,
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base + PCI_MSIX_ENTRY_UPPER_ADDR_OFFSET);
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writel(msg->data, base + PCI_MSIX_ENTRY_DATA_OFFSET);
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break;
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}
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default:
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BUG();
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}
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}
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#ifdef CONFIG_SMP
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static void set_msi_affinity(unsigned int vector, cpumask_t cpu_mask)
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{
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struct msi_desc *entry;
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struct msi_msg msg;
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unsigned int irq = vector;
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unsigned int dest_cpu = first_cpu(cpu_mask);
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entry = (struct msi_desc *)msi_desc[vector];
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if (!entry || !entry->dev)
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return;
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read_msi_msg(entry, &msg);
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msi_ops->target(vector, dest_cpu, &msg.address_hi, &msg.address_lo);
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write_msi_msg(entry, &msg);
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set_native_irq_info(irq, cpu_mask);
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}
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#else
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#define set_msi_affinity NULL
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#endif /* CONFIG_SMP */
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static void mask_MSI_irq(unsigned int vector)
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{
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msi_set_mask_bit(vector, 1);
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}
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static void unmask_MSI_irq(unsigned int vector)
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{
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msi_set_mask_bit(vector, 0);
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}
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static unsigned int startup_msi_irq_wo_maskbit(unsigned int vector)
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{
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struct msi_desc *entry;
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unsigned long flags;
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spin_lock_irqsave(&msi_lock, flags);
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entry = msi_desc[vector];
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if (!entry || !entry->dev) {
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spin_unlock_irqrestore(&msi_lock, flags);
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return 0;
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}
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entry->msi_attrib.state = 1; /* Mark it active */
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spin_unlock_irqrestore(&msi_lock, flags);
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return 0; /* never anything pending */
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}
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static unsigned int startup_msi_irq_w_maskbit(unsigned int vector)
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{
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startup_msi_irq_wo_maskbit(vector);
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unmask_MSI_irq(vector);
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return 0; /* never anything pending */
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}
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static void shutdown_msi_irq(unsigned int vector)
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{
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struct msi_desc *entry;
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unsigned long flags;
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spin_lock_irqsave(&msi_lock, flags);
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entry = msi_desc[vector];
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if (entry && entry->dev)
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entry->msi_attrib.state = 0; /* Mark it not active */
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spin_unlock_irqrestore(&msi_lock, flags);
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}
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static void end_msi_irq_wo_maskbit(unsigned int vector)
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{
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move_native_irq(vector);
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ack_APIC_irq();
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}
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static void end_msi_irq_w_maskbit(unsigned int vector)
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{
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move_native_irq(vector);
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unmask_MSI_irq(vector);
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ack_APIC_irq();
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}
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static void do_nothing(unsigned int vector)
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{
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}
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/*
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* Interrupt Type for MSI-X PCI/PCI-X/PCI-Express Devices,
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* which implement the MSI-X Capability Structure.
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*/
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static struct hw_interrupt_type msix_irq_type = {
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.typename = "PCI-MSI-X",
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.startup = startup_msi_irq_w_maskbit,
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.shutdown = shutdown_msi_irq,
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.enable = unmask_MSI_irq,
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.disable = mask_MSI_irq,
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.ack = mask_MSI_irq,
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.end = end_msi_irq_w_maskbit,
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.set_affinity = set_msi_affinity
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};
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/*
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* Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices,
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* which implement the MSI Capability Structure with
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* Mask-and-Pending Bits.
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*/
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static struct hw_interrupt_type msi_irq_w_maskbit_type = {
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.typename = "PCI-MSI",
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.startup = startup_msi_irq_w_maskbit,
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.shutdown = shutdown_msi_irq,
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.enable = unmask_MSI_irq,
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.disable = mask_MSI_irq,
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.ack = mask_MSI_irq,
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.end = end_msi_irq_w_maskbit,
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.set_affinity = set_msi_affinity
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};
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/*
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* Interrupt Type for MSI PCI/PCI-X/PCI-Express Devices,
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* which implement the MSI Capability Structure without
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* Mask-and-Pending Bits.
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*/
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static struct hw_interrupt_type msi_irq_wo_maskbit_type = {
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.typename = "PCI-MSI",
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.startup = startup_msi_irq_wo_maskbit,
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.shutdown = shutdown_msi_irq,
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.enable = do_nothing,
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.disable = do_nothing,
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.ack = do_nothing,
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.end = end_msi_irq_wo_maskbit,
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.set_affinity = set_msi_affinity
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};
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static int msi_free_vector(struct pci_dev* dev, int vector, int reassign);
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static int assign_msi_vector(void)
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{
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static int new_vector_avail = 1;
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int vector;
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unsigned long flags;
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/*
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* msi_lock is provided to ensure that successful allocation of MSI
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* vector is assigned unique among drivers.
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*/
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spin_lock_irqsave(&msi_lock, flags);
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if (!new_vector_avail) {
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int free_vector = 0;
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/*
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* vector_irq[] = -1 indicates that this specific vector is:
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* - assigned for MSI (since MSI have no associated IRQ) or
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* - assigned for legacy if less than 16, or
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* - having no corresponding 1:1 vector-to-IOxAPIC IRQ mapping
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* vector_irq[] = 0 indicates that this vector, previously
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* assigned for MSI, is freed by hotplug removed operations.
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* This vector will be reused for any subsequent hotplug added
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* operations.
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* vector_irq[] > 0 indicates that this vector is assigned for
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* IOxAPIC IRQs. This vector and its value provides a 1-to-1
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* vector-to-IOxAPIC IRQ mapping.
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*/
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for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
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if (vector_irq[vector] != 0)
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continue;
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free_vector = vector;
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if (!msi_desc[vector])
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break;
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else
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continue;
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}
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if (!free_vector) {
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spin_unlock_irqrestore(&msi_lock, flags);
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return -EBUSY;
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}
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vector_irq[free_vector] = -1;
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nr_released_vectors--;
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spin_unlock_irqrestore(&msi_lock, flags);
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if (msi_desc[free_vector] != NULL) {
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struct pci_dev *dev;
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int tail;
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/* free all linked vectors before re-assign */
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do {
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spin_lock_irqsave(&msi_lock, flags);
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dev = msi_desc[free_vector]->dev;
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tail = msi_desc[free_vector]->link.tail;
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spin_unlock_irqrestore(&msi_lock, flags);
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msi_free_vector(dev, tail, 1);
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} while (free_vector != tail);
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}
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return free_vector;
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}
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vector = assign_irq_vector(AUTO_ASSIGN);
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last_alloc_vector = vector;
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if (vector == LAST_DEVICE_VECTOR)
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new_vector_avail = 0;
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spin_unlock_irqrestore(&msi_lock, flags);
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return vector;
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}
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static int get_new_vector(void)
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{
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int vector = assign_msi_vector();
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if (vector > 0)
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set_intr_gate(vector, interrupt[vector]);
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return vector;
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}
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static int msi_init(void)
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{
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static int status = -ENOMEM;
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if (!status)
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return status;
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if (pci_msi_quirk) {
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pci_msi_enable = 0;
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printk(KERN_WARNING "PCI: MSI quirk detected. MSI disabled.\n");
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status = -EINVAL;
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return status;
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}
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status = msi_arch_init();
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if (status < 0) {
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pci_msi_enable = 0;
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printk(KERN_WARNING
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"PCI: MSI arch init failed. MSI disabled.\n");
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return status;
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}
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if (! msi_ops) {
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printk(KERN_WARNING
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"PCI: MSI ops not registered. MSI disabled.\n");
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status = -EINVAL;
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return status;
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}
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last_alloc_vector = assign_irq_vector(AUTO_ASSIGN);
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status = msi_cache_init();
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if (status < 0) {
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pci_msi_enable = 0;
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printk(KERN_WARNING "PCI: MSI cache init failed\n");
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return status;
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}
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if (last_alloc_vector < 0) {
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pci_msi_enable = 0;
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printk(KERN_WARNING "PCI: No interrupt vectors available for MSI\n");
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status = -EBUSY;
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return status;
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}
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vector_irq[last_alloc_vector] = 0;
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nr_released_vectors++;
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return status;
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}
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static int get_msi_vector(struct pci_dev *dev)
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{
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return get_new_vector();
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}
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static struct msi_desc* alloc_msi_entry(void)
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{
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struct msi_desc *entry;
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entry = kmem_cache_zalloc(msi_cachep, GFP_KERNEL);
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if (!entry)
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return NULL;
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entry->link.tail = entry->link.head = 0; /* single message */
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entry->dev = NULL;
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return entry;
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}
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static void attach_msi_entry(struct msi_desc *entry, int vector)
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{
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unsigned long flags;
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spin_lock_irqsave(&msi_lock, flags);
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msi_desc[vector] = entry;
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spin_unlock_irqrestore(&msi_lock, flags);
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}
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static void irq_handler_init(int cap_id, int pos, int mask)
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{
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unsigned long flags;
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spin_lock_irqsave(&irq_desc[pos].lock, flags);
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if (cap_id == PCI_CAP_ID_MSIX)
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irq_desc[pos].chip = &msix_irq_type;
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else {
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if (!mask)
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irq_desc[pos].chip = &msi_irq_wo_maskbit_type;
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else
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irq_desc[pos].chip = &msi_irq_w_maskbit_type;
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}
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spin_unlock_irqrestore(&irq_desc[pos].lock, flags);
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}
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static void enable_msi_mode(struct pci_dev *dev, int pos, int type)
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{
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u16 control;
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pci_read_config_word(dev, msi_control_reg(pos), &control);
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if (type == PCI_CAP_ID_MSI) {
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/* Set enabled bits to single MSI & enable MSI_enable bit */
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msi_enable(control, 1);
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pci_write_config_word(dev, msi_control_reg(pos), control);
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dev->msi_enabled = 1;
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} else {
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msix_enable(control);
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pci_write_config_word(dev, msi_control_reg(pos), control);
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dev->msix_enabled = 1;
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}
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if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
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/* PCI Express Endpoint device detected */
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pci_intx(dev, 0); /* disable intx */
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}
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}
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void disable_msi_mode(struct pci_dev *dev, int pos, int type)
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{
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u16 control;
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pci_read_config_word(dev, msi_control_reg(pos), &control);
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if (type == PCI_CAP_ID_MSI) {
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/* Set enabled bits to single MSI & enable MSI_enable bit */
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msi_disable(control);
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pci_write_config_word(dev, msi_control_reg(pos), control);
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dev->msi_enabled = 0;
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} else {
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msix_disable(control);
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|
pci_write_config_word(dev, msi_control_reg(pos), control);
|
|
dev->msix_enabled = 0;
|
|
}
|
|
if (pci_find_capability(dev, PCI_CAP_ID_EXP)) {
|
|
/* PCI Express Endpoint device detected */
|
|
pci_intx(dev, 1); /* enable intx */
|
|
}
|
|
}
|
|
|
|
static int msi_lookup_vector(struct pci_dev *dev, int type)
|
|
{
|
|
int vector;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
for (vector = FIRST_DEVICE_VECTOR; vector < NR_IRQS; vector++) {
|
|
if (!msi_desc[vector] || msi_desc[vector]->dev != dev ||
|
|
msi_desc[vector]->msi_attrib.type != type ||
|
|
msi_desc[vector]->msi_attrib.default_vector != dev->irq)
|
|
continue;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
/* This pre-assigned MSI vector for this device
|
|
already exits. Override dev->irq with this vector */
|
|
dev->irq = vector;
|
|
return 0;
|
|
}
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
|
|
return -EACCES;
|
|
}
|
|
|
|
void pci_scan_msi_device(struct pci_dev *dev)
|
|
{
|
|
if (!dev)
|
|
return;
|
|
|
|
if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0)
|
|
nr_msix_devices++;
|
|
else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0)
|
|
nr_reserved_vectors++;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
int pci_save_msi_state(struct pci_dev *dev)
|
|
{
|
|
int pos, i = 0;
|
|
u16 control;
|
|
struct pci_cap_saved_state *save_state;
|
|
u32 *cap;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
if (pos <= 0 || dev->no_msi)
|
|
return 0;
|
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
if (!(control & PCI_MSI_FLAGS_ENABLE))
|
|
return 0;
|
|
|
|
save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u32) * 5,
|
|
GFP_KERNEL);
|
|
if (!save_state) {
|
|
printk(KERN_ERR "Out of memory in pci_save_msi_state\n");
|
|
return -ENOMEM;
|
|
}
|
|
cap = &save_state->data[0];
|
|
|
|
pci_read_config_dword(dev, pos, &cap[i++]);
|
|
control = cap[0] >> 16;
|
|
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, &cap[i++]);
|
|
if (control & PCI_MSI_FLAGS_64BIT) {
|
|
pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, &cap[i++]);
|
|
pci_read_config_dword(dev, pos + PCI_MSI_DATA_64, &cap[i++]);
|
|
} else
|
|
pci_read_config_dword(dev, pos + PCI_MSI_DATA_32, &cap[i++]);
|
|
if (control & PCI_MSI_FLAGS_MASKBIT)
|
|
pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT, &cap[i++]);
|
|
save_state->cap_nr = PCI_CAP_ID_MSI;
|
|
pci_add_saved_cap(dev, save_state);
|
|
return 0;
|
|
}
|
|
|
|
void pci_restore_msi_state(struct pci_dev *dev)
|
|
{
|
|
int i = 0, pos;
|
|
u16 control;
|
|
struct pci_cap_saved_state *save_state;
|
|
u32 *cap;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSI);
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
if (!save_state || pos <= 0)
|
|
return;
|
|
cap = &save_state->data[0];
|
|
|
|
control = cap[i++] >> 16;
|
|
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, cap[i++]);
|
|
if (control & PCI_MSI_FLAGS_64BIT) {
|
|
pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, cap[i++]);
|
|
pci_write_config_dword(dev, pos + PCI_MSI_DATA_64, cap[i++]);
|
|
} else
|
|
pci_write_config_dword(dev, pos + PCI_MSI_DATA_32, cap[i++]);
|
|
if (control & PCI_MSI_FLAGS_MASKBIT)
|
|
pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT, cap[i++]);
|
|
pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
|
|
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
|
|
pci_remove_saved_cap(save_state);
|
|
kfree(save_state);
|
|
}
|
|
|
|
int pci_save_msix_state(struct pci_dev *dev)
|
|
{
|
|
int pos;
|
|
int temp;
|
|
int vector, head, tail = 0;
|
|
u16 control;
|
|
struct pci_cap_saved_state *save_state;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
if (pos <= 0 || dev->no_msi)
|
|
return 0;
|
|
|
|
/* save the capability */
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
if (!(control & PCI_MSIX_FLAGS_ENABLE))
|
|
return 0;
|
|
save_state = kzalloc(sizeof(struct pci_cap_saved_state) + sizeof(u16),
|
|
GFP_KERNEL);
|
|
if (!save_state) {
|
|
printk(KERN_ERR "Out of memory in pci_save_msix_state\n");
|
|
return -ENOMEM;
|
|
}
|
|
*((u16 *)&save_state->data[0]) = control;
|
|
|
|
/* save the table */
|
|
temp = dev->irq;
|
|
if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
|
|
kfree(save_state);
|
|
return -EINVAL;
|
|
}
|
|
|
|
vector = head = dev->irq;
|
|
while (head != tail) {
|
|
struct msi_desc *entry;
|
|
|
|
entry = msi_desc[vector];
|
|
read_msi_msg(entry, &entry->msg_save);
|
|
|
|
tail = msi_desc[vector]->link.tail;
|
|
vector = tail;
|
|
}
|
|
dev->irq = temp;
|
|
|
|
save_state->cap_nr = PCI_CAP_ID_MSIX;
|
|
pci_add_saved_cap(dev, save_state);
|
|
return 0;
|
|
}
|
|
|
|
void pci_restore_msix_state(struct pci_dev *dev)
|
|
{
|
|
u16 save;
|
|
int pos;
|
|
int vector, head, tail = 0;
|
|
struct msi_desc *entry;
|
|
int temp;
|
|
struct pci_cap_saved_state *save_state;
|
|
|
|
save_state = pci_find_saved_cap(dev, PCI_CAP_ID_MSIX);
|
|
if (!save_state)
|
|
return;
|
|
save = *((u16 *)&save_state->data[0]);
|
|
pci_remove_saved_cap(save_state);
|
|
kfree(save_state);
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
if (pos <= 0)
|
|
return;
|
|
|
|
/* route the table */
|
|
temp = dev->irq;
|
|
if (msi_lookup_vector(dev, PCI_CAP_ID_MSIX))
|
|
return;
|
|
vector = head = dev->irq;
|
|
while (head != tail) {
|
|
entry = msi_desc[vector];
|
|
write_msi_msg(entry, &entry->msg_save);
|
|
|
|
tail = msi_desc[vector]->link.tail;
|
|
vector = tail;
|
|
}
|
|
dev->irq = temp;
|
|
|
|
pci_write_config_word(dev, msi_control_reg(pos), save);
|
|
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
|
|
}
|
|
#endif
|
|
|
|
static int msi_register_init(struct pci_dev *dev, struct msi_desc *entry)
|
|
{
|
|
int status;
|
|
struct msi_msg msg;
|
|
int pos, vector = dev->irq;
|
|
u16 control;
|
|
|
|
pos = entry->msi_attrib.pos;
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
|
|
/* Configure MSI capability structure */
|
|
status = msi_ops->setup(dev, vector, &msg.address_hi, &msg.address_lo, &msg.data);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
write_msi_msg(entry, &msg);
|
|
if (entry->msi_attrib.maskbit) {
|
|
unsigned int maskbits, temp;
|
|
/* All MSIs are unmasked by default, Mask them all */
|
|
pci_read_config_dword(dev,
|
|
msi_mask_bits_reg(pos, is_64bit_address(control)),
|
|
&maskbits);
|
|
temp = (1 << multi_msi_capable(control));
|
|
temp = ((temp - 1) & ~temp);
|
|
maskbits |= temp;
|
|
pci_write_config_dword(dev,
|
|
msi_mask_bits_reg(pos, is_64bit_address(control)),
|
|
maskbits);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* msi_capability_init - configure device's MSI capability structure
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
|
*
|
|
* Setup the MSI capability structure of device function with a single
|
|
* MSI vector, regardless of device function is capable of handling
|
|
* multiple messages. A return of zero indicates the successful setup
|
|
* of an entry zero with the new MSI vector or non-zero for otherwise.
|
|
**/
|
|
static int msi_capability_init(struct pci_dev *dev)
|
|
{
|
|
int status;
|
|
struct msi_desc *entry;
|
|
int pos, vector;
|
|
u16 control;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
/* MSI Entry Initialization */
|
|
entry = alloc_msi_entry();
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
vector = get_msi_vector(dev);
|
|
if (vector < 0) {
|
|
kmem_cache_free(msi_cachep, entry);
|
|
return -EBUSY;
|
|
}
|
|
entry->link.head = vector;
|
|
entry->link.tail = vector;
|
|
entry->msi_attrib.type = PCI_CAP_ID_MSI;
|
|
entry->msi_attrib.state = 0; /* Mark it not active */
|
|
entry->msi_attrib.is_64 = is_64bit_address(control);
|
|
entry->msi_attrib.entry_nr = 0;
|
|
entry->msi_attrib.maskbit = is_mask_bit_support(control);
|
|
entry->msi_attrib.default_vector = dev->irq; /* Save IOAPIC IRQ */
|
|
entry->msi_attrib.pos = pos;
|
|
dev->irq = vector;
|
|
entry->dev = dev;
|
|
if (is_mask_bit_support(control)) {
|
|
entry->mask_base = (void __iomem *)(long)msi_mask_bits_reg(pos,
|
|
is_64bit_address(control));
|
|
}
|
|
/* Replace with MSI handler */
|
|
irq_handler_init(PCI_CAP_ID_MSI, vector, entry->msi_attrib.maskbit);
|
|
/* Configure MSI capability structure */
|
|
status = msi_register_init(dev, entry);
|
|
if (status != 0) {
|
|
dev->irq = entry->msi_attrib.default_vector;
|
|
kmem_cache_free(msi_cachep, entry);
|
|
return status;
|
|
}
|
|
|
|
attach_msi_entry(entry, vector);
|
|
/* Set MSI enabled bits */
|
|
enable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* msix_capability_init - configure device's MSI-X capability
|
|
* @dev: pointer to the pci_dev data structure of MSI-X device function
|
|
* @entries: pointer to an array of struct msix_entry entries
|
|
* @nvec: number of @entries
|
|
*
|
|
* Setup the MSI-X capability structure of device function with a
|
|
* single MSI-X vector. A return of zero indicates the successful setup of
|
|
* requested MSI-X entries with allocated vectors or non-zero for otherwise.
|
|
**/
|
|
static int msix_capability_init(struct pci_dev *dev,
|
|
struct msix_entry *entries, int nvec)
|
|
{
|
|
struct msi_desc *head = NULL, *tail = NULL, *entry = NULL;
|
|
struct msi_msg msg;
|
|
int status;
|
|
int vector, pos, i, j, nr_entries, temp = 0;
|
|
unsigned long phys_addr;
|
|
u32 table_offset;
|
|
u16 control;
|
|
u8 bir;
|
|
void __iomem *base;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
/* Request & Map MSI-X table region */
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
nr_entries = multi_msix_capable(control);
|
|
|
|
pci_read_config_dword(dev, msix_table_offset_reg(pos), &table_offset);
|
|
bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
|
|
table_offset &= ~PCI_MSIX_FLAGS_BIRMASK;
|
|
phys_addr = pci_resource_start (dev, bir) + table_offset;
|
|
base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
|
|
if (base == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* MSI-X Table Initialization */
|
|
for (i = 0; i < nvec; i++) {
|
|
entry = alloc_msi_entry();
|
|
if (!entry)
|
|
break;
|
|
vector = get_msi_vector(dev);
|
|
if (vector < 0) {
|
|
kmem_cache_free(msi_cachep, entry);
|
|
break;
|
|
}
|
|
|
|
j = entries[i].entry;
|
|
entries[i].vector = vector;
|
|
entry->msi_attrib.type = PCI_CAP_ID_MSIX;
|
|
entry->msi_attrib.state = 0; /* Mark it not active */
|
|
entry->msi_attrib.is_64 = 1;
|
|
entry->msi_attrib.entry_nr = j;
|
|
entry->msi_attrib.maskbit = 1;
|
|
entry->msi_attrib.default_vector = dev->irq;
|
|
entry->msi_attrib.pos = pos;
|
|
entry->dev = dev;
|
|
entry->mask_base = base;
|
|
if (!head) {
|
|
entry->link.head = vector;
|
|
entry->link.tail = vector;
|
|
head = entry;
|
|
} else {
|
|
entry->link.head = temp;
|
|
entry->link.tail = tail->link.tail;
|
|
tail->link.tail = vector;
|
|
head->link.head = vector;
|
|
}
|
|
temp = vector;
|
|
tail = entry;
|
|
/* Replace with MSI-X handler */
|
|
irq_handler_init(PCI_CAP_ID_MSIX, vector, 1);
|
|
/* Configure MSI-X capability structure */
|
|
status = msi_ops->setup(dev, vector,
|
|
&msg.address_hi,
|
|
&msg.address_lo,
|
|
&msg.data);
|
|
if (status < 0)
|
|
break;
|
|
|
|
write_msi_msg(entry, &msg);
|
|
attach_msi_entry(entry, vector);
|
|
}
|
|
if (i != nvec) {
|
|
i--;
|
|
for (; i >= 0; i--) {
|
|
vector = (entries + i)->vector;
|
|
msi_free_vector(dev, vector, 0);
|
|
(entries + i)->vector = 0;
|
|
}
|
|
return -EBUSY;
|
|
}
|
|
/* Set MSI-X enabled bits */
|
|
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_supported - check whether MSI may be enabled on device
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
|
*
|
|
* MSI must be globally enabled and supported by the device and its root
|
|
* bus. But, the root bus is not easy to find since some architectures
|
|
* have virtual busses on top of the PCI hierarchy (for instance the
|
|
* hypertransport bus), while the actual bus where MSI must be supported
|
|
* is below. So we test the MSI flag on all parent busses and assume
|
|
* that no quirk will ever set the NO_MSI flag on a non-root bus.
|
|
**/
|
|
static
|
|
int pci_msi_supported(struct pci_dev * dev)
|
|
{
|
|
struct pci_bus *bus;
|
|
|
|
if (!pci_msi_enable || !dev || dev->no_msi)
|
|
return -EINVAL;
|
|
|
|
/* check MSI flags of all parent busses */
|
|
for (bus = dev->bus; bus; bus = bus->parent)
|
|
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_msi - configure device's MSI capability structure
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
|
*
|
|
* Setup the MSI capability structure of device function with
|
|
* a single MSI vector upon its software driver call to request for
|
|
* MSI mode enabled on its hardware device function. A return of zero
|
|
* indicates the successful setup of an entry zero with the new MSI
|
|
* vector or non-zero for otherwise.
|
|
**/
|
|
int pci_enable_msi(struct pci_dev* dev)
|
|
{
|
|
int pos, temp, status;
|
|
|
|
if (pci_msi_supported(dev) < 0)
|
|
return -EINVAL;
|
|
|
|
temp = dev->irq;
|
|
|
|
status = msi_init();
|
|
if (status < 0)
|
|
return status;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
if (!pos)
|
|
return -EINVAL;
|
|
|
|
WARN_ON(!msi_lookup_vector(dev, PCI_CAP_ID_MSI));
|
|
|
|
/* Check whether driver already requested for MSI-X vectors */
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
|
|
printk(KERN_INFO "PCI: %s: Can't enable MSI. "
|
|
"Device already has MSI-X vectors assigned\n",
|
|
pci_name(dev));
|
|
dev->irq = temp;
|
|
return -EINVAL;
|
|
}
|
|
status = msi_capability_init(dev);
|
|
if (!status) {
|
|
if (!pos)
|
|
nr_reserved_vectors--; /* Only MSI capable */
|
|
else if (nr_msix_devices > 0)
|
|
nr_msix_devices--; /* Both MSI and MSI-X capable,
|
|
but choose enabling MSI */
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
void pci_disable_msi(struct pci_dev* dev)
|
|
{
|
|
struct msi_desc *entry;
|
|
int pos, default_vector;
|
|
u16 control;
|
|
unsigned long flags;
|
|
|
|
if (!pci_msi_enable)
|
|
return;
|
|
if (!dev)
|
|
return;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
if (!pos)
|
|
return;
|
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
if (!(control & PCI_MSI_FLAGS_ENABLE))
|
|
return;
|
|
|
|
disable_msi_mode(dev, pos, PCI_CAP_ID_MSI);
|
|
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
entry = msi_desc[dev->irq];
|
|
if (!entry || !entry->dev || entry->msi_attrib.type != PCI_CAP_ID_MSI) {
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
return;
|
|
}
|
|
if (entry->msi_attrib.state) {
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
printk(KERN_WARNING "PCI: %s: pci_disable_msi() called without "
|
|
"free_irq() on MSI vector %d\n",
|
|
pci_name(dev), dev->irq);
|
|
BUG_ON(entry->msi_attrib.state > 0);
|
|
} else {
|
|
default_vector = entry->msi_attrib.default_vector;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
msi_free_vector(dev, dev->irq, 0);
|
|
|
|
/* Restore dev->irq to its default pin-assertion vector */
|
|
dev->irq = default_vector;
|
|
}
|
|
}
|
|
|
|
static int msi_free_vector(struct pci_dev* dev, int vector, int reassign)
|
|
{
|
|
struct msi_desc *entry;
|
|
int head, entry_nr, type;
|
|
void __iomem *base;
|
|
unsigned long flags;
|
|
|
|
msi_ops->teardown(vector);
|
|
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
entry = msi_desc[vector];
|
|
if (!entry || entry->dev != dev) {
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
return -EINVAL;
|
|
}
|
|
type = entry->msi_attrib.type;
|
|
entry_nr = entry->msi_attrib.entry_nr;
|
|
head = entry->link.head;
|
|
base = entry->mask_base;
|
|
msi_desc[entry->link.head]->link.tail = entry->link.tail;
|
|
msi_desc[entry->link.tail]->link.head = entry->link.head;
|
|
entry->dev = NULL;
|
|
if (!reassign) {
|
|
vector_irq[vector] = 0;
|
|
nr_released_vectors++;
|
|
}
|
|
msi_desc[vector] = NULL;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
|
|
kmem_cache_free(msi_cachep, entry);
|
|
|
|
if (type == PCI_CAP_ID_MSIX) {
|
|
if (!reassign)
|
|
writel(1, base +
|
|
entry_nr * PCI_MSIX_ENTRY_SIZE +
|
|
PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
|
|
|
|
if (head == vector)
|
|
iounmap(base);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* pci_enable_msix - configure device's MSI-X capability structure
|
|
* @dev: pointer to the pci_dev data structure of MSI-X device function
|
|
* @entries: pointer to an array of MSI-X entries
|
|
* @nvec: number of MSI-X vectors requested for allocation by device driver
|
|
*
|
|
* Setup the MSI-X capability structure of device function with the number
|
|
* of requested vectors upon its software driver call to request for
|
|
* MSI-X mode enabled on its hardware device function. A return of zero
|
|
* indicates the successful configuration of MSI-X capability structure
|
|
* with new allocated MSI-X vectors. A return of < 0 indicates a failure.
|
|
* Or a return of > 0 indicates that driver request is exceeding the number
|
|
* of vectors available. Driver should use the returned value to re-send
|
|
* its request.
|
|
**/
|
|
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
|
|
{
|
|
int status, pos, nr_entries, free_vectors;
|
|
int i, j, temp;
|
|
u16 control;
|
|
unsigned long flags;
|
|
|
|
if (!entries || pci_msi_supported(dev) < 0)
|
|
return -EINVAL;
|
|
|
|
status = msi_init();
|
|
if (status < 0)
|
|
return status;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
if (!pos)
|
|
return -EINVAL;
|
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
nr_entries = multi_msix_capable(control);
|
|
if (nvec > nr_entries)
|
|
return -EINVAL;
|
|
|
|
/* Check for any invalid entries */
|
|
for (i = 0; i < nvec; i++) {
|
|
if (entries[i].entry >= nr_entries)
|
|
return -EINVAL; /* invalid entry */
|
|
for (j = i + 1; j < nvec; j++) {
|
|
if (entries[i].entry == entries[j].entry)
|
|
return -EINVAL; /* duplicate entry */
|
|
}
|
|
}
|
|
temp = dev->irq;
|
|
WARN_ON(!msi_lookup_vector(dev, PCI_CAP_ID_MSIX));
|
|
|
|
/* Check whether driver already requested for MSI vector */
|
|
if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0 &&
|
|
!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
|
|
printk(KERN_INFO "PCI: %s: Can't enable MSI-X. "
|
|
"Device already has an MSI vector assigned\n",
|
|
pci_name(dev));
|
|
dev->irq = temp;
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
/*
|
|
* msi_lock is provided to ensure that enough vectors resources are
|
|
* available before granting.
|
|
*/
|
|
free_vectors = pci_vector_resources(last_alloc_vector,
|
|
nr_released_vectors);
|
|
/* Ensure that each MSI/MSI-X device has one vector reserved by
|
|
default to avoid any MSI-X driver to take all available
|
|
resources */
|
|
free_vectors -= nr_reserved_vectors;
|
|
/* Find the average of free vectors among MSI-X devices */
|
|
if (nr_msix_devices > 0)
|
|
free_vectors /= nr_msix_devices;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
|
|
if (nvec > free_vectors) {
|
|
if (free_vectors > 0)
|
|
return free_vectors;
|
|
else
|
|
return -EBUSY;
|
|
}
|
|
|
|
status = msix_capability_init(dev, entries, nvec);
|
|
if (!status && nr_msix_devices > 0)
|
|
nr_msix_devices--;
|
|
|
|
return status;
|
|
}
|
|
|
|
void pci_disable_msix(struct pci_dev* dev)
|
|
{
|
|
int pos, temp;
|
|
u16 control;
|
|
|
|
if (!pci_msi_enable)
|
|
return;
|
|
if (!dev)
|
|
return;
|
|
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
if (!pos)
|
|
return;
|
|
|
|
pci_read_config_word(dev, msi_control_reg(pos), &control);
|
|
if (!(control & PCI_MSIX_FLAGS_ENABLE))
|
|
return;
|
|
|
|
disable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
|
|
|
|
temp = dev->irq;
|
|
if (!msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
|
|
int state, vector, head, tail = 0, warning = 0;
|
|
unsigned long flags;
|
|
|
|
vector = head = dev->irq;
|
|
dev->irq = temp; /* Restore pin IRQ */
|
|
while (head != tail) {
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
state = msi_desc[vector]->msi_attrib.state;
|
|
tail = msi_desc[vector]->link.tail;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
if (state)
|
|
warning = 1;
|
|
else if (vector != head) /* Release MSI-X vector */
|
|
msi_free_vector(dev, vector, 0);
|
|
vector = tail;
|
|
}
|
|
msi_free_vector(dev, vector, 0);
|
|
if (warning) {
|
|
printk(KERN_WARNING "PCI: %s: pci_disable_msix() called without "
|
|
"free_irq() on all MSI-X vectors\n",
|
|
pci_name(dev));
|
|
BUG_ON(warning > 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* msi_remove_pci_irq_vectors - reclaim MSI(X) vectors to unused state
|
|
* @dev: pointer to the pci_dev data structure of MSI(X) device function
|
|
*
|
|
* Being called during hotplug remove, from which the device function
|
|
* is hot-removed. All previous assigned MSI/MSI-X vectors, if
|
|
* allocated for this device function, are reclaimed to unused state,
|
|
* which may be used later on.
|
|
**/
|
|
void msi_remove_pci_irq_vectors(struct pci_dev* dev)
|
|
{
|
|
int state, pos, temp;
|
|
unsigned long flags;
|
|
|
|
if (!pci_msi_enable || !dev)
|
|
return;
|
|
|
|
temp = dev->irq; /* Save IOAPIC IRQ */
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
|
|
if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
state = msi_desc[dev->irq]->msi_attrib.state;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
if (state) {
|
|
printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
|
|
"called without free_irq() on MSI vector %d\n",
|
|
pci_name(dev), dev->irq);
|
|
BUG_ON(state > 0);
|
|
} else /* Release MSI vector assigned to this device */
|
|
msi_free_vector(dev, dev->irq, 0);
|
|
dev->irq = temp; /* Restore IOAPIC IRQ */
|
|
}
|
|
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
|
|
if (pos > 0 && !msi_lookup_vector(dev, PCI_CAP_ID_MSIX)) {
|
|
int vector, head, tail = 0, warning = 0;
|
|
void __iomem *base = NULL;
|
|
|
|
vector = head = dev->irq;
|
|
while (head != tail) {
|
|
spin_lock_irqsave(&msi_lock, flags);
|
|
state = msi_desc[vector]->msi_attrib.state;
|
|
tail = msi_desc[vector]->link.tail;
|
|
base = msi_desc[vector]->mask_base;
|
|
spin_unlock_irqrestore(&msi_lock, flags);
|
|
if (state)
|
|
warning = 1;
|
|
else if (vector != head) /* Release MSI-X vector */
|
|
msi_free_vector(dev, vector, 0);
|
|
vector = tail;
|
|
}
|
|
msi_free_vector(dev, vector, 0);
|
|
if (warning) {
|
|
iounmap(base);
|
|
printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
|
|
"called without free_irq() on all MSI-X vectors\n",
|
|
pci_name(dev));
|
|
BUG_ON(warning > 0);
|
|
}
|
|
dev->irq = temp; /* Restore IOAPIC IRQ */
|
|
}
|
|
}
|
|
|
|
void pci_no_msi(void)
|
|
{
|
|
pci_msi_enable = 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(pci_enable_msi);
|
|
EXPORT_SYMBOL(pci_disable_msi);
|
|
EXPORT_SYMBOL(pci_enable_msix);
|
|
EXPORT_SYMBOL(pci_disable_msix);
|