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f3b0946d62
Bharat Kumar Gogada reported issues with the generic MSI code, where the
end-point ended up with garbage in its MSI configuration (both for the vector
and the message).
It turns out that the two MSI paths in the kernel are doing slightly different
things:
generic MSI: disable MSI -> allocate MSI -> enable MSI -> setup EP
PCI MSI: disable MSI -> allocate MSI -> setup EP -> enable MSI
And it turns out that end-points are allowed to latch the content of the MSI
configuration registers as soon as MSIs are enabled. In Bharat's case, the
end-point ends up using whatever was there already, which is not what you
want.
In order to make things converge, we introduce a new MSI domain flag
(MSI_FLAG_ACTIVATE_EARLY) that is unconditionally set for PCI/MSI. When set,
this flag forces the programming of the end-point as soon as the MSIs are
allocated.
A consequence of this is that we have an extra activate in irq_startup, but
that should be without much consequence.
tglx:
- Several people reported a VMWare regression with PCI/MSI-X passthrough. It
turns out that the patch also cures that issue.
- We need to have a look at the MSI disable interrupt path, where we write
the msg to all zeros without disabling MSI in the PCI device. Is that
correct?
Fixes: 52f518a3a7
"x86/MSI: Use hierarchical irqdomains to manage MSI interrupts"
Reported-and-tested-by: Bharat Kumar Gogada <bharat.kumar.gogada@xilinx.com>
Reported-and-tested-by: Foster Snowhill <forst@forstwoof.ru>
Reported-by: Matthias Prager <linux@matthiasprager.de>
Reported-by: Jason Taylor <jason.taylor@simplivity.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1468426713-31431-1-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
1526 lines
39 KiB
C
1526 lines
39 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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* Copyright (C) 2016 Christoph Hellwig.
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*/
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#include <linux/err.h>
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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/export.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/proc_fs.h>
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#include <linux/msi.h>
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#include <linux/smp.h>
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#include <linux/errno.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/irqdomain.h>
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#include <linux/of_irq.h>
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#include "pci.h"
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static int pci_msi_enable = 1;
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int pci_msi_ignore_mask;
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#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
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#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
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static struct irq_domain *pci_msi_default_domain;
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static DEFINE_MUTEX(pci_msi_domain_lock);
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struct irq_domain * __weak arch_get_pci_msi_domain(struct pci_dev *dev)
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{
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return pci_msi_default_domain;
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}
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static struct irq_domain *pci_msi_get_domain(struct pci_dev *dev)
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{
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struct irq_domain *domain;
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domain = dev_get_msi_domain(&dev->dev);
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if (domain)
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return domain;
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return arch_get_pci_msi_domain(dev);
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}
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static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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struct irq_domain *domain;
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domain = pci_msi_get_domain(dev);
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if (domain && irq_domain_is_hierarchy(domain))
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return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
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return arch_setup_msi_irqs(dev, nvec, type);
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}
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static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
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{
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struct irq_domain *domain;
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domain = pci_msi_get_domain(dev);
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if (domain && irq_domain_is_hierarchy(domain))
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pci_msi_domain_free_irqs(domain, dev);
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else
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arch_teardown_msi_irqs(dev);
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}
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#else
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#define pci_msi_setup_msi_irqs arch_setup_msi_irqs
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#define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
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#endif
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/* Arch hooks */
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int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
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{
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struct msi_controller *chip = dev->bus->msi;
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int err;
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if (!chip || !chip->setup_irq)
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return -EINVAL;
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err = chip->setup_irq(chip, dev, desc);
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if (err < 0)
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return err;
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irq_set_chip_data(desc->irq, chip);
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return 0;
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}
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void __weak arch_teardown_msi_irq(unsigned int irq)
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{
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struct msi_controller *chip = irq_get_chip_data(irq);
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if (!chip || !chip->teardown_irq)
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return;
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chip->teardown_irq(chip, irq);
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}
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int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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struct msi_controller *chip = dev->bus->msi;
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struct msi_desc *entry;
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int ret;
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if (chip && chip->setup_irqs)
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return chip->setup_irqs(chip, dev, nvec, type);
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/*
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* If an architecture wants to support multiple MSI, it needs to
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* override arch_setup_msi_irqs()
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*/
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if (type == PCI_CAP_ID_MSI && nvec > 1)
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return 1;
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for_each_pci_msi_entry(entry, dev) {
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ret = arch_setup_msi_irq(dev, entry);
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if (ret < 0)
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return ret;
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if (ret > 0)
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return -ENOSPC;
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}
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return 0;
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}
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/*
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* We have a default implementation available as a separate non-weak
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* function, as it is used by the Xen x86 PCI code
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*/
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void default_teardown_msi_irqs(struct pci_dev *dev)
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{
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int i;
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struct msi_desc *entry;
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for_each_pci_msi_entry(entry, dev)
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if (entry->irq)
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for (i = 0; i < entry->nvec_used; i++)
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arch_teardown_msi_irq(entry->irq + i);
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}
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void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
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{
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return default_teardown_msi_irqs(dev);
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}
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static void default_restore_msi_irq(struct pci_dev *dev, int irq)
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{
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struct msi_desc *entry;
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entry = NULL;
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if (dev->msix_enabled) {
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for_each_pci_msi_entry(entry, dev) {
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if (irq == entry->irq)
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break;
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}
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} else if (dev->msi_enabled) {
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entry = irq_get_msi_desc(irq);
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}
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if (entry)
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__pci_write_msi_msg(entry, &entry->msg);
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}
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void __weak arch_restore_msi_irqs(struct pci_dev *dev)
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{
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return default_restore_msi_irqs(dev);
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}
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static inline __attribute_const__ u32 msi_mask(unsigned x)
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{
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/* Don't shift by >= width of type */
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if (x >= 5)
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return 0xffffffff;
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return (1 << (1 << x)) - 1;
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}
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/*
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* PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
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* mask all MSI interrupts by clearing the MSI enable bit does not work
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* reliably as devices without an INTx disable bit will then generate a
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* level IRQ which will never be cleared.
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*/
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u32 __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
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{
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u32 mask_bits = desc->masked;
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if (pci_msi_ignore_mask || !desc->msi_attrib.maskbit)
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return 0;
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mask_bits &= ~mask;
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mask_bits |= flag;
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pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->mask_pos,
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mask_bits);
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return mask_bits;
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}
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static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
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{
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desc->masked = __pci_msi_desc_mask_irq(desc, mask, flag);
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}
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static void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
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{
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return desc->mask_base +
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desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
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}
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/*
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* This internal function does not flush PCI writes to the device.
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* All users must ensure that they read from the device before either
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* assuming that the device state is up to date, or returning out of this
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* file. This saves a few milliseconds when initialising devices with lots
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* of MSI-X interrupts.
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*/
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u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag)
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{
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u32 mask_bits = desc->masked;
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if (pci_msi_ignore_mask)
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return 0;
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mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
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if (flag)
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mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
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writel(mask_bits, pci_msix_desc_addr(desc) + PCI_MSIX_ENTRY_VECTOR_CTRL);
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return mask_bits;
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}
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static void msix_mask_irq(struct msi_desc *desc, u32 flag)
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{
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desc->masked = __pci_msix_desc_mask_irq(desc, flag);
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}
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static void msi_set_mask_bit(struct irq_data *data, u32 flag)
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{
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struct msi_desc *desc = irq_data_get_msi_desc(data);
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if (desc->msi_attrib.is_msix) {
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msix_mask_irq(desc, flag);
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readl(desc->mask_base); /* Flush write to device */
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} else {
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unsigned offset = data->irq - desc->irq;
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msi_mask_irq(desc, 1 << offset, flag << offset);
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}
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}
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/**
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* pci_msi_mask_irq - Generic irq chip callback to mask PCI/MSI interrupts
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* @data: pointer to irqdata associated to that interrupt
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*/
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void pci_msi_mask_irq(struct irq_data *data)
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{
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msi_set_mask_bit(data, 1);
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}
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EXPORT_SYMBOL_GPL(pci_msi_mask_irq);
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/**
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* pci_msi_unmask_irq - Generic irq chip callback to unmask PCI/MSI interrupts
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* @data: pointer to irqdata associated to that interrupt
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*/
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void pci_msi_unmask_irq(struct irq_data *data)
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{
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msi_set_mask_bit(data, 0);
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}
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EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);
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void default_restore_msi_irqs(struct pci_dev *dev)
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{
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struct msi_desc *entry;
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for_each_pci_msi_entry(entry, dev)
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default_restore_msi_irq(dev, entry->irq);
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}
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void __pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
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{
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struct pci_dev *dev = msi_desc_to_pci_dev(entry);
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BUG_ON(dev->current_state != PCI_D0);
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if (entry->msi_attrib.is_msix) {
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void __iomem *base = pci_msix_desc_addr(entry);
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msg->address_lo = readl(base + PCI_MSIX_ENTRY_LOWER_ADDR);
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msg->address_hi = readl(base + PCI_MSIX_ENTRY_UPPER_ADDR);
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msg->data = readl(base + PCI_MSIX_ENTRY_DATA);
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} else {
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int pos = dev->msi_cap;
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u16 data;
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pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
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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, pos + PCI_MSI_ADDRESS_HI,
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&msg->address_hi);
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pci_read_config_word(dev, pos + PCI_MSI_DATA_64, &data);
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} else {
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msg->address_hi = 0;
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pci_read_config_word(dev, pos + PCI_MSI_DATA_32, &data);
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}
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msg->data = data;
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}
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}
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void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
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{
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struct pci_dev *dev = msi_desc_to_pci_dev(entry);
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if (dev->current_state != PCI_D0) {
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/* Don't touch the hardware now */
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} else if (entry->msi_attrib.is_msix) {
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void __iomem *base = pci_msix_desc_addr(entry);
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writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
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writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
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writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
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} else {
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int pos = dev->msi_cap;
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u16 msgctl;
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pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
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msgctl &= ~PCI_MSI_FLAGS_QSIZE;
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msgctl |= entry->msi_attrib.multiple << 4;
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pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);
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pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
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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, pos + PCI_MSI_ADDRESS_HI,
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msg->address_hi);
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pci_write_config_word(dev, pos + PCI_MSI_DATA_64,
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msg->data);
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} else {
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pci_write_config_word(dev, pos + PCI_MSI_DATA_32,
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msg->data);
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}
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}
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entry->msg = *msg;
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}
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void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)
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{
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struct msi_desc *entry = irq_get_msi_desc(irq);
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__pci_write_msi_msg(entry, msg);
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}
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EXPORT_SYMBOL_GPL(pci_write_msi_msg);
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static void free_msi_irqs(struct pci_dev *dev)
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{
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struct list_head *msi_list = dev_to_msi_list(&dev->dev);
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struct msi_desc *entry, *tmp;
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struct attribute **msi_attrs;
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struct device_attribute *dev_attr;
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int i, count = 0;
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for_each_pci_msi_entry(entry, dev)
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if (entry->irq)
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for (i = 0; i < entry->nvec_used; i++)
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BUG_ON(irq_has_action(entry->irq + i));
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pci_msi_teardown_msi_irqs(dev);
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list_for_each_entry_safe(entry, tmp, msi_list, list) {
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if (entry->msi_attrib.is_msix) {
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if (list_is_last(&entry->list, msi_list))
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iounmap(entry->mask_base);
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}
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list_del(&entry->list);
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kfree(entry);
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}
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if (dev->msi_irq_groups) {
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sysfs_remove_groups(&dev->dev.kobj, dev->msi_irq_groups);
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msi_attrs = dev->msi_irq_groups[0]->attrs;
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while (msi_attrs[count]) {
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dev_attr = container_of(msi_attrs[count],
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struct device_attribute, attr);
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kfree(dev_attr->attr.name);
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kfree(dev_attr);
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++count;
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}
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kfree(msi_attrs);
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kfree(dev->msi_irq_groups[0]);
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kfree(dev->msi_irq_groups);
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dev->msi_irq_groups = NULL;
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}
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}
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static void pci_intx_for_msi(struct pci_dev *dev, int enable)
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{
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if (!(dev->dev_flags & PCI_DEV_FLAGS_MSI_INTX_DISABLE_BUG))
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pci_intx(dev, enable);
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}
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static void __pci_restore_msi_state(struct pci_dev *dev)
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{
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u16 control;
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struct msi_desc *entry;
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if (!dev->msi_enabled)
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return;
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entry = irq_get_msi_desc(dev->irq);
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pci_intx_for_msi(dev, 0);
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pci_msi_set_enable(dev, 0);
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arch_restore_msi_irqs(dev);
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pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
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msi_mask_irq(entry, msi_mask(entry->msi_attrib.multi_cap),
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entry->masked);
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control &= ~PCI_MSI_FLAGS_QSIZE;
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control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
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pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
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}
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static void __pci_restore_msix_state(struct pci_dev *dev)
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{
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struct msi_desc *entry;
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if (!dev->msix_enabled)
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return;
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BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
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/* route the table */
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pci_intx_for_msi(dev, 0);
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pci_msix_clear_and_set_ctrl(dev, 0,
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PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);
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arch_restore_msi_irqs(dev);
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for_each_pci_msi_entry(entry, dev)
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msix_mask_irq(entry, entry->masked);
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pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
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}
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void pci_restore_msi_state(struct pci_dev *dev)
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{
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__pci_restore_msi_state(dev);
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__pci_restore_msix_state(dev);
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}
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EXPORT_SYMBOL_GPL(pci_restore_msi_state);
|
|
|
|
static ssize_t msi_mode_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct msi_desc *entry;
|
|
unsigned long irq;
|
|
int retval;
|
|
|
|
retval = kstrtoul(attr->attr.name, 10, &irq);
|
|
if (retval)
|
|
return retval;
|
|
|
|
entry = irq_get_msi_desc(irq);
|
|
if (entry)
|
|
return sprintf(buf, "%s\n",
|
|
entry->msi_attrib.is_msix ? "msix" : "msi");
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int populate_msi_sysfs(struct pci_dev *pdev)
|
|
{
|
|
struct attribute **msi_attrs;
|
|
struct attribute *msi_attr;
|
|
struct device_attribute *msi_dev_attr;
|
|
struct attribute_group *msi_irq_group;
|
|
const struct attribute_group **msi_irq_groups;
|
|
struct msi_desc *entry;
|
|
int ret = -ENOMEM;
|
|
int num_msi = 0;
|
|
int count = 0;
|
|
int i;
|
|
|
|
/* Determine how many msi entries we have */
|
|
for_each_pci_msi_entry(entry, pdev)
|
|
num_msi += entry->nvec_used;
|
|
if (!num_msi)
|
|
return 0;
|
|
|
|
/* Dynamically create the MSI attributes for the PCI device */
|
|
msi_attrs = kzalloc(sizeof(void *) * (num_msi + 1), GFP_KERNEL);
|
|
if (!msi_attrs)
|
|
return -ENOMEM;
|
|
for_each_pci_msi_entry(entry, pdev) {
|
|
for (i = 0; i < entry->nvec_used; i++) {
|
|
msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
|
|
if (!msi_dev_attr)
|
|
goto error_attrs;
|
|
msi_attrs[count] = &msi_dev_attr->attr;
|
|
|
|
sysfs_attr_init(&msi_dev_attr->attr);
|
|
msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
|
|
entry->irq + i);
|
|
if (!msi_dev_attr->attr.name)
|
|
goto error_attrs;
|
|
msi_dev_attr->attr.mode = S_IRUGO;
|
|
msi_dev_attr->show = msi_mode_show;
|
|
++count;
|
|
}
|
|
}
|
|
|
|
msi_irq_group = kzalloc(sizeof(*msi_irq_group), GFP_KERNEL);
|
|
if (!msi_irq_group)
|
|
goto error_attrs;
|
|
msi_irq_group->name = "msi_irqs";
|
|
msi_irq_group->attrs = msi_attrs;
|
|
|
|
msi_irq_groups = kzalloc(sizeof(void *) * 2, GFP_KERNEL);
|
|
if (!msi_irq_groups)
|
|
goto error_irq_group;
|
|
msi_irq_groups[0] = msi_irq_group;
|
|
|
|
ret = sysfs_create_groups(&pdev->dev.kobj, msi_irq_groups);
|
|
if (ret)
|
|
goto error_irq_groups;
|
|
pdev->msi_irq_groups = msi_irq_groups;
|
|
|
|
return 0;
|
|
|
|
error_irq_groups:
|
|
kfree(msi_irq_groups);
|
|
error_irq_group:
|
|
kfree(msi_irq_group);
|
|
error_attrs:
|
|
count = 0;
|
|
msi_attr = msi_attrs[count];
|
|
while (msi_attr) {
|
|
msi_dev_attr = container_of(msi_attr, struct device_attribute, attr);
|
|
kfree(msi_attr->name);
|
|
kfree(msi_dev_attr);
|
|
++count;
|
|
msi_attr = msi_attrs[count];
|
|
}
|
|
kfree(msi_attrs);
|
|
return ret;
|
|
}
|
|
|
|
static struct msi_desc *msi_setup_entry(struct pci_dev *dev, int nvec)
|
|
{
|
|
u16 control;
|
|
struct msi_desc *entry;
|
|
|
|
/* MSI Entry Initialization */
|
|
entry = alloc_msi_entry(&dev->dev);
|
|
if (!entry)
|
|
return NULL;
|
|
|
|
pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
|
|
|
|
entry->msi_attrib.is_msix = 0;
|
|
entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT);
|
|
entry->msi_attrib.entry_nr = 0;
|
|
entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT);
|
|
entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
|
|
entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
|
|
entry->msi_attrib.multiple = ilog2(__roundup_pow_of_two(nvec));
|
|
entry->nvec_used = nvec;
|
|
entry->affinity = dev->irq_affinity;
|
|
|
|
if (control & PCI_MSI_FLAGS_64BIT)
|
|
entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_64;
|
|
else
|
|
entry->mask_pos = dev->msi_cap + PCI_MSI_MASK_32;
|
|
|
|
/* Save the initial mask status */
|
|
if (entry->msi_attrib.maskbit)
|
|
pci_read_config_dword(dev, entry->mask_pos, &entry->masked);
|
|
|
|
return entry;
|
|
}
|
|
|
|
static int msi_verify_entries(struct pci_dev *dev)
|
|
{
|
|
struct msi_desc *entry;
|
|
|
|
for_each_pci_msi_entry(entry, dev) {
|
|
if (!dev->no_64bit_msi || !entry->msg.address_hi)
|
|
continue;
|
|
dev_err(&dev->dev, "Device has broken 64-bit MSI but arch"
|
|
" tried to assign one above 4G\n");
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* msi_capability_init - configure device's MSI capability structure
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
|
* @nvec: number of interrupts to allocate
|
|
*
|
|
* Setup the MSI capability structure of the device with the requested
|
|
* number of interrupts. A return value of zero indicates the successful
|
|
* setup of an entry with the new MSI irq. A negative return value indicates
|
|
* an error, and a positive return value indicates the number of interrupts
|
|
* which could have been allocated.
|
|
*/
|
|
static int msi_capability_init(struct pci_dev *dev, int nvec)
|
|
{
|
|
struct msi_desc *entry;
|
|
int ret;
|
|
unsigned mask;
|
|
|
|
pci_msi_set_enable(dev, 0); /* Disable MSI during set up */
|
|
|
|
entry = msi_setup_entry(dev, nvec);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
/* All MSIs are unmasked by default, Mask them all */
|
|
mask = msi_mask(entry->msi_attrib.multi_cap);
|
|
msi_mask_irq(entry, mask, mask);
|
|
|
|
list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
|
|
|
|
/* Configure MSI capability structure */
|
|
ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
|
|
if (ret) {
|
|
msi_mask_irq(entry, mask, ~mask);
|
|
free_msi_irqs(dev);
|
|
return ret;
|
|
}
|
|
|
|
ret = msi_verify_entries(dev);
|
|
if (ret) {
|
|
msi_mask_irq(entry, mask, ~mask);
|
|
free_msi_irqs(dev);
|
|
return ret;
|
|
}
|
|
|
|
ret = populate_msi_sysfs(dev);
|
|
if (ret) {
|
|
msi_mask_irq(entry, mask, ~mask);
|
|
free_msi_irqs(dev);
|
|
return ret;
|
|
}
|
|
|
|
/* Set MSI enabled bits */
|
|
pci_intx_for_msi(dev, 0);
|
|
pci_msi_set_enable(dev, 1);
|
|
dev->msi_enabled = 1;
|
|
|
|
pcibios_free_irq(dev);
|
|
dev->irq = entry->irq;
|
|
return 0;
|
|
}
|
|
|
|
static void __iomem *msix_map_region(struct pci_dev *dev, unsigned nr_entries)
|
|
{
|
|
resource_size_t phys_addr;
|
|
u32 table_offset;
|
|
unsigned long flags;
|
|
u8 bir;
|
|
|
|
pci_read_config_dword(dev, dev->msix_cap + PCI_MSIX_TABLE,
|
|
&table_offset);
|
|
bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
|
|
flags = pci_resource_flags(dev, bir);
|
|
if (!flags || (flags & IORESOURCE_UNSET))
|
|
return NULL;
|
|
|
|
table_offset &= PCI_MSIX_TABLE_OFFSET;
|
|
phys_addr = pci_resource_start(dev, bir) + table_offset;
|
|
|
|
return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
|
|
}
|
|
|
|
static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
|
|
struct msix_entry *entries, int nvec)
|
|
{
|
|
const struct cpumask *mask = NULL;
|
|
struct msi_desc *entry;
|
|
int cpu = -1, i;
|
|
|
|
for (i = 0; i < nvec; i++) {
|
|
if (dev->irq_affinity) {
|
|
cpu = cpumask_next(cpu, dev->irq_affinity);
|
|
if (cpu >= nr_cpu_ids)
|
|
cpu = cpumask_first(dev->irq_affinity);
|
|
mask = cpumask_of(cpu);
|
|
}
|
|
|
|
entry = alloc_msi_entry(&dev->dev);
|
|
if (!entry) {
|
|
if (!i)
|
|
iounmap(base);
|
|
else
|
|
free_msi_irqs(dev);
|
|
/* No enough memory. Don't try again */
|
|
return -ENOMEM;
|
|
}
|
|
|
|
entry->msi_attrib.is_msix = 1;
|
|
entry->msi_attrib.is_64 = 1;
|
|
if (entries)
|
|
entry->msi_attrib.entry_nr = entries[i].entry;
|
|
else
|
|
entry->msi_attrib.entry_nr = i;
|
|
entry->msi_attrib.default_irq = dev->irq;
|
|
entry->mask_base = base;
|
|
entry->nvec_used = 1;
|
|
entry->affinity = mask;
|
|
|
|
list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void msix_program_entries(struct pci_dev *dev,
|
|
struct msix_entry *entries)
|
|
{
|
|
struct msi_desc *entry;
|
|
int i = 0;
|
|
|
|
for_each_pci_msi_entry(entry, dev) {
|
|
if (entries)
|
|
entries[i++].vector = entry->irq;
|
|
entry->masked = readl(pci_msix_desc_addr(entry) +
|
|
PCI_MSIX_ENTRY_VECTOR_CTRL);
|
|
msix_mask_irq(entry, 1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 irq. A return of zero indicates the successful setup of
|
|
* requested MSI-X entries with allocated irqs or non-zero for otherwise.
|
|
**/
|
|
static int msix_capability_init(struct pci_dev *dev,
|
|
struct msix_entry *entries, int nvec)
|
|
{
|
|
int ret;
|
|
u16 control;
|
|
void __iomem *base;
|
|
|
|
/* Ensure MSI-X is disabled while it is set up */
|
|
pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
|
|
|
|
pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
|
|
/* Request & Map MSI-X table region */
|
|
base = msix_map_region(dev, msix_table_size(control));
|
|
if (!base)
|
|
return -ENOMEM;
|
|
|
|
ret = msix_setup_entries(dev, base, entries, nvec);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
|
|
if (ret)
|
|
goto out_avail;
|
|
|
|
/* Check if all MSI entries honor device restrictions */
|
|
ret = msi_verify_entries(dev);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
/*
|
|
* Some devices require MSI-X to be enabled before we can touch the
|
|
* MSI-X registers. We need to mask all the vectors to prevent
|
|
* interrupts coming in before they're fully set up.
|
|
*/
|
|
pci_msix_clear_and_set_ctrl(dev, 0,
|
|
PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE);
|
|
|
|
msix_program_entries(dev, entries);
|
|
|
|
ret = populate_msi_sysfs(dev);
|
|
if (ret)
|
|
goto out_free;
|
|
|
|
/* Set MSI-X enabled bits and unmask the function */
|
|
pci_intx_for_msi(dev, 0);
|
|
dev->msix_enabled = 1;
|
|
pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
|
|
|
|
pcibios_free_irq(dev);
|
|
return 0;
|
|
|
|
out_avail:
|
|
if (ret < 0) {
|
|
/*
|
|
* If we had some success, report the number of irqs
|
|
* we succeeded in setting up.
|
|
*/
|
|
struct msi_desc *entry;
|
|
int avail = 0;
|
|
|
|
for_each_pci_msi_entry(entry, dev) {
|
|
if (entry->irq != 0)
|
|
avail++;
|
|
}
|
|
if (avail != 0)
|
|
ret = avail;
|
|
}
|
|
|
|
out_free:
|
|
free_msi_irqs(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_supported - check whether MSI may be enabled on a device
|
|
* @dev: pointer to the pci_dev data structure of MSI device function
|
|
* @nvec: how many MSIs have been requested ?
|
|
*
|
|
* Look at global flags, the device itself, and its parent buses
|
|
* to determine if MSI/-X are supported for the device. If MSI/-X is
|
|
* supported return 1, else return 0.
|
|
**/
|
|
static int pci_msi_supported(struct pci_dev *dev, int nvec)
|
|
{
|
|
struct pci_bus *bus;
|
|
|
|
/* MSI must be globally enabled and supported by the device */
|
|
if (!pci_msi_enable)
|
|
return 0;
|
|
|
|
if (!dev || dev->no_msi || dev->current_state != PCI_D0)
|
|
return 0;
|
|
|
|
/*
|
|
* You can't ask to have 0 or less MSIs configured.
|
|
* a) it's stupid ..
|
|
* b) the list manipulation code assumes nvec >= 1.
|
|
*/
|
|
if (nvec < 1)
|
|
return 0;
|
|
|
|
/*
|
|
* Any bridge which does NOT route MSI transactions from its
|
|
* secondary bus to its primary bus must set NO_MSI flag on
|
|
* the secondary pci_bus.
|
|
* We expect only arch-specific PCI host bus controller driver
|
|
* or quirks for specific PCI bridges to be setting NO_MSI.
|
|
*/
|
|
for (bus = dev->bus; bus; bus = bus->parent)
|
|
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_vec_count - Return the number of MSI vectors a device can send
|
|
* @dev: device to report about
|
|
*
|
|
* This function returns the number of MSI vectors a device requested via
|
|
* Multiple Message Capable register. It returns a negative errno if the
|
|
* device is not capable sending MSI interrupts. Otherwise, the call succeeds
|
|
* and returns a power of two, up to a maximum of 2^5 (32), according to the
|
|
* MSI specification.
|
|
**/
|
|
int pci_msi_vec_count(struct pci_dev *dev)
|
|
{
|
|
int ret;
|
|
u16 msgctl;
|
|
|
|
if (!dev->msi_cap)
|
|
return -EINVAL;
|
|
|
|
pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &msgctl);
|
|
ret = 1 << ((msgctl & PCI_MSI_FLAGS_QMASK) >> 1);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(pci_msi_vec_count);
|
|
|
|
void pci_msi_shutdown(struct pci_dev *dev)
|
|
{
|
|
struct msi_desc *desc;
|
|
u32 mask;
|
|
|
|
if (!pci_msi_enable || !dev || !dev->msi_enabled)
|
|
return;
|
|
|
|
BUG_ON(list_empty(dev_to_msi_list(&dev->dev)));
|
|
desc = first_pci_msi_entry(dev);
|
|
|
|
pci_msi_set_enable(dev, 0);
|
|
pci_intx_for_msi(dev, 1);
|
|
dev->msi_enabled = 0;
|
|
|
|
/* Return the device with MSI unmasked as initial states */
|
|
mask = msi_mask(desc->msi_attrib.multi_cap);
|
|
/* Keep cached state to be restored */
|
|
__pci_msi_desc_mask_irq(desc, mask, ~mask);
|
|
|
|
/* Restore dev->irq to its default pin-assertion irq */
|
|
dev->irq = desc->msi_attrib.default_irq;
|
|
pcibios_alloc_irq(dev);
|
|
}
|
|
|
|
void pci_disable_msi(struct pci_dev *dev)
|
|
{
|
|
if (!pci_msi_enable || !dev || !dev->msi_enabled)
|
|
return;
|
|
|
|
pci_msi_shutdown(dev);
|
|
free_msi_irqs(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_disable_msi);
|
|
|
|
/**
|
|
* pci_msix_vec_count - return the number of device's MSI-X table entries
|
|
* @dev: pointer to the pci_dev data structure of MSI-X device function
|
|
* This function returns the number of device's MSI-X table entries and
|
|
* therefore the number of MSI-X vectors device is capable of sending.
|
|
* It returns a negative errno if the device is not capable of sending MSI-X
|
|
* interrupts.
|
|
**/
|
|
int pci_msix_vec_count(struct pci_dev *dev)
|
|
{
|
|
u16 control;
|
|
|
|
if (!dev->msix_cap)
|
|
return -EINVAL;
|
|
|
|
pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);
|
|
return msix_table_size(control);
|
|
}
|
|
EXPORT_SYMBOL(pci_msix_vec_count);
|
|
|
|
/**
|
|
* 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 (optional)
|
|
* @nvec: number of MSI-X irqs requested for allocation by device driver
|
|
*
|
|
* Setup the MSI-X capability structure of device function with the number
|
|
* of requested irqs 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 irqs. A return of < 0 indicates a failure.
|
|
* Or a return of > 0 indicates that driver request is exceeding the number
|
|
* of irqs or MSI-X 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 nr_entries;
|
|
int i, j;
|
|
|
|
if (!pci_msi_supported(dev, nvec))
|
|
return -EINVAL;
|
|
|
|
nr_entries = pci_msix_vec_count(dev);
|
|
if (nr_entries < 0)
|
|
return nr_entries;
|
|
if (nvec > nr_entries)
|
|
return nr_entries;
|
|
|
|
if (entries) {
|
|
/* 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 */
|
|
}
|
|
}
|
|
}
|
|
WARN_ON(!!dev->msix_enabled);
|
|
|
|
/* Check whether driver already requested for MSI irq */
|
|
if (dev->msi_enabled) {
|
|
dev_info(&dev->dev, "can't enable MSI-X (MSI IRQ already assigned)\n");
|
|
return -EINVAL;
|
|
}
|
|
return msix_capability_init(dev, entries, nvec);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_msix);
|
|
|
|
void pci_msix_shutdown(struct pci_dev *dev)
|
|
{
|
|
struct msi_desc *entry;
|
|
|
|
if (!pci_msi_enable || !dev || !dev->msix_enabled)
|
|
return;
|
|
|
|
/* Return the device with MSI-X masked as initial states */
|
|
for_each_pci_msi_entry(entry, dev) {
|
|
/* Keep cached states to be restored */
|
|
__pci_msix_desc_mask_irq(entry, 1);
|
|
}
|
|
|
|
pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
|
|
pci_intx_for_msi(dev, 1);
|
|
dev->msix_enabled = 0;
|
|
pcibios_alloc_irq(dev);
|
|
}
|
|
|
|
void pci_disable_msix(struct pci_dev *dev)
|
|
{
|
|
if (!pci_msi_enable || !dev || !dev->msix_enabled)
|
|
return;
|
|
|
|
pci_msix_shutdown(dev);
|
|
free_msi_irqs(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_disable_msix);
|
|
|
|
void pci_no_msi(void)
|
|
{
|
|
pci_msi_enable = 0;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_enabled - is MSI enabled?
|
|
*
|
|
* Returns true if MSI has not been disabled by the command-line option
|
|
* pci=nomsi.
|
|
**/
|
|
int pci_msi_enabled(void)
|
|
{
|
|
return pci_msi_enable;
|
|
}
|
|
EXPORT_SYMBOL(pci_msi_enabled);
|
|
|
|
static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
|
|
unsigned int flags)
|
|
{
|
|
int nvec;
|
|
int rc;
|
|
|
|
if (!pci_msi_supported(dev, minvec))
|
|
return -EINVAL;
|
|
|
|
WARN_ON(!!dev->msi_enabled);
|
|
|
|
/* Check whether driver already requested MSI-X irqs */
|
|
if (dev->msix_enabled) {
|
|
dev_info(&dev->dev,
|
|
"can't enable MSI (MSI-X already enabled)\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (maxvec < minvec)
|
|
return -ERANGE;
|
|
|
|
nvec = pci_msi_vec_count(dev);
|
|
if (nvec < 0)
|
|
return nvec;
|
|
if (nvec < minvec)
|
|
return -EINVAL;
|
|
|
|
if (nvec > maxvec)
|
|
nvec = maxvec;
|
|
|
|
for (;;) {
|
|
if (!(flags & PCI_IRQ_NOAFFINITY)) {
|
|
dev->irq_affinity = irq_create_affinity_mask(&nvec);
|
|
if (nvec < minvec)
|
|
return -ENOSPC;
|
|
}
|
|
|
|
rc = msi_capability_init(dev, nvec);
|
|
if (rc == 0)
|
|
return nvec;
|
|
|
|
kfree(dev->irq_affinity);
|
|
dev->irq_affinity = NULL;
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
if (rc < minvec)
|
|
return -ENOSPC;
|
|
|
|
nvec = rc;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_enable_msi_range - configure device's MSI capability structure
|
|
* @dev: device to configure
|
|
* @minvec: minimal number of interrupts to configure
|
|
* @maxvec: maximum number of interrupts to configure
|
|
*
|
|
* This function tries to allocate a maximum possible number of interrupts in a
|
|
* range between @minvec and @maxvec. It returns a negative errno if an error
|
|
* occurs. If it succeeds, it returns the actual number of interrupts allocated
|
|
* and updates the @dev's irq member to the lowest new interrupt number;
|
|
* the other interrupt numbers allocated to this device are consecutive.
|
|
**/
|
|
int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
|
|
{
|
|
return __pci_enable_msi_range(dev, minvec, maxvec, PCI_IRQ_NOAFFINITY);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_msi_range);
|
|
|
|
static int __pci_enable_msix_range(struct pci_dev *dev,
|
|
struct msix_entry *entries, int minvec, int maxvec,
|
|
unsigned int flags)
|
|
{
|
|
int nvec = maxvec;
|
|
int rc;
|
|
|
|
if (maxvec < minvec)
|
|
return -ERANGE;
|
|
|
|
for (;;) {
|
|
if (!(flags & PCI_IRQ_NOAFFINITY)) {
|
|
dev->irq_affinity = irq_create_affinity_mask(&nvec);
|
|
if (nvec < minvec)
|
|
return -ENOSPC;
|
|
}
|
|
|
|
rc = pci_enable_msix(dev, entries, nvec);
|
|
if (rc == 0)
|
|
return nvec;
|
|
|
|
kfree(dev->irq_affinity);
|
|
dev->irq_affinity = NULL;
|
|
|
|
if (rc < 0)
|
|
return rc;
|
|
if (rc < minvec)
|
|
return -ENOSPC;
|
|
|
|
nvec = rc;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* pci_enable_msix_range - 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
|
|
* @minvec: minimum number of MSI-X irqs requested
|
|
* @maxvec: maximum number of MSI-X irqs requested
|
|
*
|
|
* Setup the MSI-X capability structure of device function with a maximum
|
|
* possible number of interrupts in the range between @minvec and @maxvec
|
|
* upon its software driver call to request for MSI-X mode enabled on its
|
|
* hardware device function. It returns a negative errno if an error occurs.
|
|
* If it succeeds, it returns the actual number of interrupts allocated and
|
|
* indicates the successful configuration of MSI-X capability structure
|
|
* with new allocated MSI-X interrupts.
|
|
**/
|
|
int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
|
|
int minvec, int maxvec)
|
|
{
|
|
return __pci_enable_msix_range(dev, entries, minvec, maxvec,
|
|
PCI_IRQ_NOAFFINITY);
|
|
}
|
|
EXPORT_SYMBOL(pci_enable_msix_range);
|
|
|
|
/**
|
|
* pci_alloc_irq_vectors - allocate multiple IRQs for a device
|
|
* @dev: PCI device to operate on
|
|
* @min_vecs: minimum number of vectors required (must be >= 1)
|
|
* @max_vecs: maximum (desired) number of vectors
|
|
* @flags: flags or quirks for the allocation
|
|
*
|
|
* Allocate up to @max_vecs interrupt vectors for @dev, using MSI-X or MSI
|
|
* vectors if available, and fall back to a single legacy vector
|
|
* if neither is available. Return the number of vectors allocated,
|
|
* (which might be smaller than @max_vecs) if successful, or a negative
|
|
* error code on error. If less than @min_vecs interrupt vectors are
|
|
* available for @dev the function will fail with -ENOSPC.
|
|
*
|
|
* To get the Linux IRQ number used for a vector that can be passed to
|
|
* request_irq() use the pci_irq_vector() helper.
|
|
*/
|
|
int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
|
|
unsigned int max_vecs, unsigned int flags)
|
|
{
|
|
int vecs = -ENOSPC;
|
|
|
|
if (!(flags & PCI_IRQ_NOMSIX)) {
|
|
vecs = __pci_enable_msix_range(dev, NULL, min_vecs, max_vecs,
|
|
flags);
|
|
if (vecs > 0)
|
|
return vecs;
|
|
}
|
|
|
|
if (!(flags & PCI_IRQ_NOMSI)) {
|
|
vecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, flags);
|
|
if (vecs > 0)
|
|
return vecs;
|
|
}
|
|
|
|
/* use legacy irq if allowed */
|
|
if (!(flags & PCI_IRQ_NOLEGACY) && min_vecs == 1)
|
|
return 1;
|
|
return vecs;
|
|
}
|
|
EXPORT_SYMBOL(pci_alloc_irq_vectors);
|
|
|
|
/**
|
|
* pci_free_irq_vectors - free previously allocated IRQs for a device
|
|
* @dev: PCI device to operate on
|
|
*
|
|
* Undoes the allocations and enabling in pci_alloc_irq_vectors().
|
|
*/
|
|
void pci_free_irq_vectors(struct pci_dev *dev)
|
|
{
|
|
pci_disable_msix(dev);
|
|
pci_disable_msi(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_free_irq_vectors);
|
|
|
|
/**
|
|
* pci_irq_vector - return Linux IRQ number of a device vector
|
|
* @dev: PCI device to operate on
|
|
* @nr: device-relative interrupt vector index (0-based).
|
|
*/
|
|
int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
|
|
{
|
|
if (dev->msix_enabled) {
|
|
struct msi_desc *entry;
|
|
int i = 0;
|
|
|
|
for_each_pci_msi_entry(entry, dev) {
|
|
if (i == nr)
|
|
return entry->irq;
|
|
i++;
|
|
}
|
|
WARN_ON_ONCE(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (dev->msi_enabled) {
|
|
struct msi_desc *entry = first_pci_msi_entry(dev);
|
|
|
|
if (WARN_ON_ONCE(nr >= entry->nvec_used))
|
|
return -EINVAL;
|
|
} else {
|
|
if (WARN_ON_ONCE(nr > 0))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return dev->irq + nr;
|
|
}
|
|
EXPORT_SYMBOL(pci_irq_vector);
|
|
|
|
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
|
|
{
|
|
return to_pci_dev(desc->dev);
|
|
}
|
|
EXPORT_SYMBOL(msi_desc_to_pci_dev);
|
|
|
|
void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
|
|
{
|
|
struct pci_dev *dev = msi_desc_to_pci_dev(desc);
|
|
|
|
return dev->bus->sysdata;
|
|
}
|
|
EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata);
|
|
|
|
#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
|
|
/**
|
|
* pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
|
|
* @irq_data: Pointer to interrupt data of the MSI interrupt
|
|
* @msg: Pointer to the message
|
|
*/
|
|
void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
|
|
{
|
|
struct msi_desc *desc = irq_data_get_msi_desc(irq_data);
|
|
|
|
/*
|
|
* For MSI-X desc->irq is always equal to irq_data->irq. For
|
|
* MSI only the first interrupt of MULTI MSI passes the test.
|
|
*/
|
|
if (desc->irq == irq_data->irq)
|
|
__pci_write_msi_msg(desc, msg);
|
|
}
|
|
|
|
/**
|
|
* pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
|
|
* @dev: Pointer to the PCI device
|
|
* @desc: Pointer to the msi descriptor
|
|
*
|
|
* The ID number is only used within the irqdomain.
|
|
*/
|
|
irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
|
|
struct msi_desc *desc)
|
|
{
|
|
return (irq_hw_number_t)desc->msi_attrib.entry_nr |
|
|
PCI_DEVID(dev->bus->number, dev->devfn) << 11 |
|
|
(pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
|
|
}
|
|
|
|
static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
|
|
{
|
|
return !desc->msi_attrib.is_msix && desc->nvec_used > 1;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_domain_check_cap - Verify that @domain supports the capabilities for @dev
|
|
* @domain: The interrupt domain to check
|
|
* @info: The domain info for verification
|
|
* @dev: The device to check
|
|
*
|
|
* Returns:
|
|
* 0 if the functionality is supported
|
|
* 1 if Multi MSI is requested, but the domain does not support it
|
|
* -ENOTSUPP otherwise
|
|
*/
|
|
int pci_msi_domain_check_cap(struct irq_domain *domain,
|
|
struct msi_domain_info *info, struct device *dev)
|
|
{
|
|
struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
|
|
|
|
/* Special handling to support pci_enable_msi_range() */
|
|
if (pci_msi_desc_is_multi_msi(desc) &&
|
|
!(info->flags & MSI_FLAG_MULTI_PCI_MSI))
|
|
return 1;
|
|
else if (desc->msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
|
|
return -ENOTSUPP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pci_msi_domain_handle_error(struct irq_domain *domain,
|
|
struct msi_desc *desc, int error)
|
|
{
|
|
/* Special handling to support pci_enable_msi_range() */
|
|
if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
|
|
return 1;
|
|
|
|
return error;
|
|
}
|
|
|
|
#ifdef GENERIC_MSI_DOMAIN_OPS
|
|
static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
|
|
struct msi_desc *desc)
|
|
{
|
|
arg->desc = desc;
|
|
arg->hwirq = pci_msi_domain_calc_hwirq(msi_desc_to_pci_dev(desc),
|
|
desc);
|
|
}
|
|
#else
|
|
#define pci_msi_domain_set_desc NULL
|
|
#endif
|
|
|
|
static struct msi_domain_ops pci_msi_domain_ops_default = {
|
|
.set_desc = pci_msi_domain_set_desc,
|
|
.msi_check = pci_msi_domain_check_cap,
|
|
.handle_error = pci_msi_domain_handle_error,
|
|
};
|
|
|
|
static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
|
|
{
|
|
struct msi_domain_ops *ops = info->ops;
|
|
|
|
if (ops == NULL) {
|
|
info->ops = &pci_msi_domain_ops_default;
|
|
} else {
|
|
if (ops->set_desc == NULL)
|
|
ops->set_desc = pci_msi_domain_set_desc;
|
|
if (ops->msi_check == NULL)
|
|
ops->msi_check = pci_msi_domain_check_cap;
|
|
if (ops->handle_error == NULL)
|
|
ops->handle_error = pci_msi_domain_handle_error;
|
|
}
|
|
}
|
|
|
|
static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
|
|
{
|
|
struct irq_chip *chip = info->chip;
|
|
|
|
BUG_ON(!chip);
|
|
if (!chip->irq_write_msi_msg)
|
|
chip->irq_write_msi_msg = pci_msi_domain_write_msg;
|
|
if (!chip->irq_mask)
|
|
chip->irq_mask = pci_msi_mask_irq;
|
|
if (!chip->irq_unmask)
|
|
chip->irq_unmask = pci_msi_unmask_irq;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_create_irq_domain - Create a MSI interrupt domain
|
|
* @fwnode: Optional fwnode of the interrupt controller
|
|
* @info: MSI domain info
|
|
* @parent: Parent irq domain
|
|
*
|
|
* Updates the domain and chip ops and creates a MSI interrupt domain.
|
|
*
|
|
* Returns:
|
|
* A domain pointer or NULL in case of failure.
|
|
*/
|
|
struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
|
|
struct msi_domain_info *info,
|
|
struct irq_domain *parent)
|
|
{
|
|
struct irq_domain *domain;
|
|
|
|
if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
|
|
pci_msi_domain_update_dom_ops(info);
|
|
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
|
|
pci_msi_domain_update_chip_ops(info);
|
|
|
|
info->flags |= MSI_FLAG_ACTIVATE_EARLY;
|
|
|
|
domain = msi_create_irq_domain(fwnode, info, parent);
|
|
if (!domain)
|
|
return NULL;
|
|
|
|
domain->bus_token = DOMAIN_BUS_PCI_MSI;
|
|
return domain;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
|
|
|
|
/**
|
|
* pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
|
|
* @domain: The interrupt domain to allocate from
|
|
* @dev: The device for which to allocate
|
|
* @nvec: The number of interrupts to allocate
|
|
* @type: Unused to allow simpler migration from the arch_XXX interfaces
|
|
*
|
|
* Returns:
|
|
* A virtual interrupt number or an error code in case of failure
|
|
*/
|
|
int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
|
|
int nvec, int type)
|
|
{
|
|
return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
|
|
}
|
|
|
|
/**
|
|
* pci_msi_domain_free_irqs - Free interrupts for @dev in @domain
|
|
* @domain: The interrupt domain
|
|
* @dev: The device for which to free interrupts
|
|
*/
|
|
void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
|
|
{
|
|
msi_domain_free_irqs(domain, &dev->dev);
|
|
}
|
|
|
|
/**
|
|
* pci_msi_create_default_irq_domain - Create a default MSI interrupt domain
|
|
* @fwnode: Optional fwnode of the interrupt controller
|
|
* @info: MSI domain info
|
|
* @parent: Parent irq domain
|
|
*
|
|
* Returns: A domain pointer or NULL in case of failure. If successful
|
|
* the default PCI/MSI irqdomain pointer is updated.
|
|
*/
|
|
struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnode,
|
|
struct msi_domain_info *info, struct irq_domain *parent)
|
|
{
|
|
struct irq_domain *domain;
|
|
|
|
mutex_lock(&pci_msi_domain_lock);
|
|
if (pci_msi_default_domain) {
|
|
pr_err("PCI: default irq domain for PCI MSI has already been created.\n");
|
|
domain = NULL;
|
|
} else {
|
|
domain = pci_msi_create_irq_domain(fwnode, info, parent);
|
|
pci_msi_default_domain = domain;
|
|
}
|
|
mutex_unlock(&pci_msi_domain_lock);
|
|
|
|
return domain;
|
|
}
|
|
|
|
static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
|
|
{
|
|
u32 *pa = data;
|
|
|
|
*pa = alias;
|
|
return 0;
|
|
}
|
|
/**
|
|
* pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
|
|
* @domain: The interrupt domain
|
|
* @pdev: The PCI device.
|
|
*
|
|
* The RID for a device is formed from the alias, with a firmware
|
|
* supplied mapping applied
|
|
*
|
|
* Returns: The RID.
|
|
*/
|
|
u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
|
|
{
|
|
struct device_node *of_node;
|
|
u32 rid = 0;
|
|
|
|
pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
|
|
|
|
of_node = irq_domain_get_of_node(domain);
|
|
if (of_node)
|
|
rid = of_msi_map_rid(&pdev->dev, of_node, rid);
|
|
|
|
return rid;
|
|
}
|
|
|
|
/**
|
|
* pci_msi_get_device_domain - Get the MSI domain for a given PCI device
|
|
* @pdev: The PCI device
|
|
*
|
|
* Use the firmware data to find a device-specific MSI domain
|
|
* (i.e. not one that is ste as a default).
|
|
*
|
|
* Returns: The coresponding MSI domain or NULL if none has been found.
|
|
*/
|
|
struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
|
|
{
|
|
u32 rid = 0;
|
|
|
|
pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
|
|
return of_msi_map_get_device_domain(&pdev->dev, rid);
|
|
}
|
|
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
|