![Bart Van Assche](/assets/img/avatar_default.png)
Most dma_map_ops structures are never modified. Constify these structures such that these can be write-protected. This patch has been generated as follows: git grep -l 'struct dma_map_ops' | xargs -d\\n sed -i \ -e 's/struct dma_map_ops/const struct dma_map_ops/g' \ -e 's/const struct dma_map_ops {/struct dma_map_ops {/g' \ -e 's/^const struct dma_map_ops;$/struct dma_map_ops;/' \ -e 's/const const struct dma_map_ops /const struct dma_map_ops /g'; sed -i -e 's/const \(struct dma_map_ops intel_dma_ops\)/\1/' \ $(git grep -l 'struct dma_map_ops intel_dma_ops'); sed -i -e 's/const \(struct dma_map_ops dma_iommu_ops\)/\1/' \ $(git grep -l 'struct dma_map_ops' | grep ^arch/powerpc); sed -i -e '/^struct vmd_dev {$/,/^};$/ s/const \(struct dma_map_ops[[:blank:]]dma_ops;\)/\1/' \ -e '/^static void vmd_setup_dma_ops/,/^}$/ s/const \(struct dma_map_ops \*dest\)/\1/' \ -e 's/const \(struct dma_map_ops \*dest = \&vmd->dma_ops\)/\1/' \ drivers/pci/host/*.c sed -i -e '/^void __init pci_iommu_alloc(void)$/,/^}$/ s/dma_ops->/intel_dma_ops./' arch/ia64/kernel/pci-dma.c sed -i -e 's/static const struct dma_map_ops sn_dma_ops/static struct dma_map_ops sn_dma_ops/' arch/ia64/sn/pci/pci_dma.c sed -i -e 's/(const struct dma_map_ops \*)//' drivers/misc/mic/bus/vop_bus.c Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Juergen Gross <jgross@suse.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Russell King <linux@armlinux.org.uk> Cc: x86@kernel.org Signed-off-by: Doug Ledford <dledford@redhat.com>
783 lines
20 KiB
C
783 lines
20 KiB
C
/*
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* Volume Management Device driver
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* Copyright (c) 2015, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/msi.h>
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#include <linux/pci.h>
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#include <linux/srcu.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <asm/irqdomain.h>
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#include <asm/device.h>
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#include <asm/msi.h>
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#include <asm/msidef.h>
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#define VMD_CFGBAR 0
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#define VMD_MEMBAR1 2
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#define VMD_MEMBAR2 4
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/*
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* Lock for manipulating VMD IRQ lists.
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*/
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static DEFINE_RAW_SPINLOCK(list_lock);
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/**
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* struct vmd_irq - private data to map driver IRQ to the VMD shared vector
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* @node: list item for parent traversal.
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* @irq: back pointer to parent.
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* @enabled: true if driver enabled IRQ
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* @virq: the virtual IRQ value provided to the requesting driver.
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*
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* Every MSI/MSI-X IRQ requested for a device in a VMD domain will be mapped to
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* a VMD IRQ using this structure.
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*/
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struct vmd_irq {
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struct list_head node;
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struct vmd_irq_list *irq;
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bool enabled;
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unsigned int virq;
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};
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/**
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* struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector
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* @irq_list: the list of irq's the VMD one demuxes to.
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* @srcu: SRCU struct for local synchronization.
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* @count: number of child IRQs assigned to this vector; used to track
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* sharing.
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*/
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struct vmd_irq_list {
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struct list_head irq_list;
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struct srcu_struct srcu;
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unsigned int count;
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};
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struct vmd_dev {
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struct pci_dev *dev;
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spinlock_t cfg_lock;
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char __iomem *cfgbar;
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int msix_count;
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struct vmd_irq_list *irqs;
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struct pci_sysdata sysdata;
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struct resource resources[3];
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struct irq_domain *irq_domain;
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struct pci_bus *bus;
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#ifdef CONFIG_X86_DEV_DMA_OPS
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struct dma_map_ops dma_ops;
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struct dma_domain dma_domain;
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#endif
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};
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static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
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{
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return container_of(bus->sysdata, struct vmd_dev, sysdata);
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}
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static inline unsigned int index_from_irqs(struct vmd_dev *vmd,
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struct vmd_irq_list *irqs)
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{
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return irqs - vmd->irqs;
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}
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/*
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* Drivers managing a device in a VMD domain allocate their own IRQs as before,
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* but the MSI entry for the hardware it's driving will be programmed with a
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* destination ID for the VMD MSI-X table. The VMD muxes interrupts in its
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* domain into one of its own, and the VMD driver de-muxes these for the
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* handlers sharing that VMD IRQ. The vmd irq_domain provides the operations
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* and irq_chip to set this up.
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*/
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static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
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{
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struct vmd_irq *vmdirq = data->chip_data;
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struct vmd_irq_list *irq = vmdirq->irq;
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struct vmd_dev *vmd = irq_data_get_irq_handler_data(data);
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msg->address_hi = MSI_ADDR_BASE_HI;
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msg->address_lo = MSI_ADDR_BASE_LO |
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MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq));
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msg->data = 0;
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}
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/*
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* We rely on MSI_FLAG_USE_DEF_CHIP_OPS to set the IRQ mask/unmask ops.
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*/
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static void vmd_irq_enable(struct irq_data *data)
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{
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struct vmd_irq *vmdirq = data->chip_data;
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unsigned long flags;
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raw_spin_lock_irqsave(&list_lock, flags);
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WARN_ON(vmdirq->enabled);
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list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
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vmdirq->enabled = true;
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raw_spin_unlock_irqrestore(&list_lock, flags);
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data->chip->irq_unmask(data);
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}
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static void vmd_irq_disable(struct irq_data *data)
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{
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struct vmd_irq *vmdirq = data->chip_data;
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unsigned long flags;
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data->chip->irq_mask(data);
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raw_spin_lock_irqsave(&list_lock, flags);
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if (vmdirq->enabled) {
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list_del_rcu(&vmdirq->node);
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vmdirq->enabled = false;
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}
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raw_spin_unlock_irqrestore(&list_lock, flags);
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}
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/*
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* XXX: Stubbed until we develop acceptable way to not create conflicts with
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* other devices sharing the same vector.
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*/
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static int vmd_irq_set_affinity(struct irq_data *data,
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const struct cpumask *dest, bool force)
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{
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return -EINVAL;
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}
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static struct irq_chip vmd_msi_controller = {
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.name = "VMD-MSI",
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.irq_enable = vmd_irq_enable,
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.irq_disable = vmd_irq_disable,
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.irq_compose_msi_msg = vmd_compose_msi_msg,
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.irq_set_affinity = vmd_irq_set_affinity,
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};
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static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info,
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msi_alloc_info_t *arg)
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{
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return 0;
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}
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/*
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* XXX: We can be even smarter selecting the best IRQ once we solve the
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* affinity problem.
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*/
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static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc)
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{
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int i, best = 1;
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unsigned long flags;
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if (!desc->msi_attrib.is_msix || vmd->msix_count == 1)
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return &vmd->irqs[0];
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raw_spin_lock_irqsave(&list_lock, flags);
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for (i = 1; i < vmd->msix_count; i++)
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if (vmd->irqs[i].count < vmd->irqs[best].count)
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best = i;
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vmd->irqs[best].count++;
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raw_spin_unlock_irqrestore(&list_lock, flags);
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return &vmd->irqs[best];
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}
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static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info,
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unsigned int virq, irq_hw_number_t hwirq,
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msi_alloc_info_t *arg)
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{
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struct msi_desc *desc = arg->desc;
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struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus);
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struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL);
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unsigned int index, vector;
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if (!vmdirq)
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return -ENOMEM;
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INIT_LIST_HEAD(&vmdirq->node);
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vmdirq->irq = vmd_next_irq(vmd, desc);
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vmdirq->virq = virq;
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index = index_from_irqs(vmd, vmdirq->irq);
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vector = pci_irq_vector(vmd->dev, index);
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irq_domain_set_info(domain, virq, vector, info->chip, vmdirq,
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handle_untracked_irq, vmd, NULL);
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return 0;
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}
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static void vmd_msi_free(struct irq_domain *domain,
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struct msi_domain_info *info, unsigned int virq)
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{
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struct vmd_irq *vmdirq = irq_get_chip_data(virq);
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unsigned long flags;
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synchronize_srcu(&vmdirq->irq->srcu);
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/* XXX: Potential optimization to rebalance */
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raw_spin_lock_irqsave(&list_lock, flags);
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vmdirq->irq->count--;
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raw_spin_unlock_irqrestore(&list_lock, flags);
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kfree(vmdirq);
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}
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static int vmd_msi_prepare(struct irq_domain *domain, struct device *dev,
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int nvec, msi_alloc_info_t *arg)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
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if (nvec > vmd->msix_count)
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return vmd->msix_count;
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memset(arg, 0, sizeof(*arg));
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return 0;
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}
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static void vmd_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
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{
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arg->desc = desc;
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}
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static struct msi_domain_ops vmd_msi_domain_ops = {
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.get_hwirq = vmd_get_hwirq,
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.msi_init = vmd_msi_init,
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.msi_free = vmd_msi_free,
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.msi_prepare = vmd_msi_prepare,
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.set_desc = vmd_set_desc,
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};
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static struct msi_domain_info vmd_msi_domain_info = {
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.flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
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MSI_FLAG_PCI_MSIX,
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.ops = &vmd_msi_domain_ops,
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.chip = &vmd_msi_controller,
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};
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#ifdef CONFIG_X86_DEV_DMA_OPS
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/*
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* VMD replaces the requester ID with its own. DMA mappings for devices in a
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* VMD domain need to be mapped for the VMD, not the device requiring
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* the mapping.
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*/
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static struct device *to_vmd_dev(struct device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev);
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struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
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return &vmd->dev->dev;
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}
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static const struct dma_map_ops *vmd_dma_ops(struct device *dev)
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{
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return get_dma_ops(to_vmd_dev(dev));
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}
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static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
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gfp_t flag, unsigned long attrs)
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{
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return vmd_dma_ops(dev)->alloc(to_vmd_dev(dev), size, addr, flag,
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attrs);
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}
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static void vmd_free(struct device *dev, size_t size, void *vaddr,
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dma_addr_t addr, unsigned long attrs)
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{
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return vmd_dma_ops(dev)->free(to_vmd_dev(dev), size, vaddr, addr,
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attrs);
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}
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static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t addr, size_t size,
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unsigned long attrs)
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{
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return vmd_dma_ops(dev)->mmap(to_vmd_dev(dev), vma, cpu_addr, addr,
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size, attrs);
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}
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static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t addr, size_t size,
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unsigned long attrs)
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{
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return vmd_dma_ops(dev)->get_sgtable(to_vmd_dev(dev), sgt, cpu_addr,
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addr, size, attrs);
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}
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static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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return vmd_dma_ops(dev)->map_page(to_vmd_dev(dev), page, offset, size,
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dir, attrs);
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}
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static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
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enum dma_data_direction dir, unsigned long attrs)
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{
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vmd_dma_ops(dev)->unmap_page(to_vmd_dev(dev), addr, size, dir, attrs);
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}
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static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir, unsigned long attrs)
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{
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return vmd_dma_ops(dev)->map_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
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}
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static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir, unsigned long attrs)
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{
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vmd_dma_ops(dev)->unmap_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
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}
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static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
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size_t size, enum dma_data_direction dir)
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{
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vmd_dma_ops(dev)->sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
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}
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static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
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size_t size, enum dma_data_direction dir)
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{
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vmd_dma_ops(dev)->sync_single_for_device(to_vmd_dev(dev), addr, size,
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dir);
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}
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static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir)
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{
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vmd_dma_ops(dev)->sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
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}
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static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir)
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{
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vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
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}
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static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
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{
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return vmd_dma_ops(dev)->mapping_error(to_vmd_dev(dev), addr);
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}
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static int vmd_dma_supported(struct device *dev, u64 mask)
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{
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return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
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}
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#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
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static u64 vmd_get_required_mask(struct device *dev)
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{
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return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
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}
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#endif
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static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
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{
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struct dma_domain *domain = &vmd->dma_domain;
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if (get_dma_ops(&vmd->dev->dev))
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del_dma_domain(domain);
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}
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#define ASSIGN_VMD_DMA_OPS(source, dest, fn) \
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do { \
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if (source->fn) \
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dest->fn = vmd_##fn; \
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} while (0)
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static void vmd_setup_dma_ops(struct vmd_dev *vmd)
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{
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const struct dma_map_ops *source = get_dma_ops(&vmd->dev->dev);
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struct dma_map_ops *dest = &vmd->dma_ops;
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struct dma_domain *domain = &vmd->dma_domain;
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domain->domain_nr = vmd->sysdata.domain;
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domain->dma_ops = dest;
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if (!source)
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return;
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ASSIGN_VMD_DMA_OPS(source, dest, alloc);
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ASSIGN_VMD_DMA_OPS(source, dest, free);
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ASSIGN_VMD_DMA_OPS(source, dest, mmap);
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ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
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ASSIGN_VMD_DMA_OPS(source, dest, map_page);
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ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
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ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
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ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
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ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
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ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
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ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
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ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
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ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
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ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
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#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
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ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
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#endif
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add_dma_domain(domain);
|
|
}
|
|
#undef ASSIGN_VMD_DMA_OPS
|
|
#else
|
|
static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
|
|
static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
|
|
#endif
|
|
|
|
static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
|
|
unsigned int devfn, int reg, int len)
|
|
{
|
|
char __iomem *addr = vmd->cfgbar +
|
|
(bus->number << 20) + (devfn << 12) + reg;
|
|
|
|
if ((addr - vmd->cfgbar) + len >=
|
|
resource_size(&vmd->dev->resource[VMD_CFGBAR]))
|
|
return NULL;
|
|
|
|
return addr;
|
|
}
|
|
|
|
/*
|
|
* CPU may deadlock if config space is not serialized on some versions of this
|
|
* hardware, so all config space access is done under a spinlock.
|
|
*/
|
|
static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg,
|
|
int len, u32 *value)
|
|
{
|
|
struct vmd_dev *vmd = vmd_from_bus(bus);
|
|
char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
if (!addr)
|
|
return -EFAULT;
|
|
|
|
spin_lock_irqsave(&vmd->cfg_lock, flags);
|
|
switch (len) {
|
|
case 1:
|
|
*value = readb(addr);
|
|
break;
|
|
case 2:
|
|
*value = readw(addr);
|
|
break;
|
|
case 4:
|
|
*value = readl(addr);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&vmd->cfg_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* VMD h/w converts non-posted config writes to posted memory writes. The
|
|
* read-back in this function forces the completion so it returns only after
|
|
* the config space was written, as expected.
|
|
*/
|
|
static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg,
|
|
int len, u32 value)
|
|
{
|
|
struct vmd_dev *vmd = vmd_from_bus(bus);
|
|
char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
if (!addr)
|
|
return -EFAULT;
|
|
|
|
spin_lock_irqsave(&vmd->cfg_lock, flags);
|
|
switch (len) {
|
|
case 1:
|
|
writeb(value, addr);
|
|
readb(addr);
|
|
break;
|
|
case 2:
|
|
writew(value, addr);
|
|
readw(addr);
|
|
break;
|
|
case 4:
|
|
writel(value, addr);
|
|
readl(addr);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&vmd->cfg_lock, flags);
|
|
return ret;
|
|
}
|
|
|
|
static struct pci_ops vmd_ops = {
|
|
.read = vmd_pci_read,
|
|
.write = vmd_pci_write,
|
|
};
|
|
|
|
static void vmd_attach_resources(struct vmd_dev *vmd)
|
|
{
|
|
vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
|
|
vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
|
|
}
|
|
|
|
static void vmd_detach_resources(struct vmd_dev *vmd)
|
|
{
|
|
vmd->dev->resource[VMD_MEMBAR1].child = NULL;
|
|
vmd->dev->resource[VMD_MEMBAR2].child = NULL;
|
|
}
|
|
|
|
/*
|
|
* VMD domains start at 0x1000 to not clash with ACPI _SEG domains.
|
|
*/
|
|
static int vmd_find_free_domain(void)
|
|
{
|
|
int domain = 0xffff;
|
|
struct pci_bus *bus = NULL;
|
|
|
|
while ((bus = pci_find_next_bus(bus)) != NULL)
|
|
domain = max_t(int, domain, pci_domain_nr(bus));
|
|
return domain + 1;
|
|
}
|
|
|
|
static int vmd_enable_domain(struct vmd_dev *vmd)
|
|
{
|
|
struct pci_sysdata *sd = &vmd->sysdata;
|
|
struct resource *res;
|
|
u32 upper_bits;
|
|
unsigned long flags;
|
|
LIST_HEAD(resources);
|
|
|
|
res = &vmd->dev->resource[VMD_CFGBAR];
|
|
vmd->resources[0] = (struct resource) {
|
|
.name = "VMD CFGBAR",
|
|
.start = 0,
|
|
.end = (resource_size(res) >> 20) - 1,
|
|
.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
|
|
};
|
|
|
|
/*
|
|
* If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
|
|
* put 32-bit resources in the window.
|
|
*
|
|
* There's no hardware reason why a 64-bit window *couldn't*
|
|
* contain a 32-bit resource, but pbus_size_mem() computes the
|
|
* bridge window size assuming a 64-bit window will contain no
|
|
* 32-bit resources. __pci_assign_resource() enforces that
|
|
* artificial restriction to make sure everything will fit.
|
|
*
|
|
* The only way we could use a 64-bit non-prefechable MEMBAR is
|
|
* if its address is <4GB so that we can convert it to a 32-bit
|
|
* resource. To be visible to the host OS, all VMD endpoints must
|
|
* be initially configured by platform BIOS, which includes setting
|
|
* up these resources. We can assume the device is configured
|
|
* according to the platform needs.
|
|
*/
|
|
res = &vmd->dev->resource[VMD_MEMBAR1];
|
|
upper_bits = upper_32_bits(res->end);
|
|
flags = res->flags & ~IORESOURCE_SIZEALIGN;
|
|
if (!upper_bits)
|
|
flags &= ~IORESOURCE_MEM_64;
|
|
vmd->resources[1] = (struct resource) {
|
|
.name = "VMD MEMBAR1",
|
|
.start = res->start,
|
|
.end = res->end,
|
|
.flags = flags,
|
|
.parent = res,
|
|
};
|
|
|
|
res = &vmd->dev->resource[VMD_MEMBAR2];
|
|
upper_bits = upper_32_bits(res->end);
|
|
flags = res->flags & ~IORESOURCE_SIZEALIGN;
|
|
if (!upper_bits)
|
|
flags &= ~IORESOURCE_MEM_64;
|
|
vmd->resources[2] = (struct resource) {
|
|
.name = "VMD MEMBAR2",
|
|
.start = res->start + 0x2000,
|
|
.end = res->end,
|
|
.flags = flags,
|
|
.parent = res,
|
|
};
|
|
|
|
sd->vmd_domain = true;
|
|
sd->domain = vmd_find_free_domain();
|
|
if (sd->domain < 0)
|
|
return sd->domain;
|
|
|
|
sd->node = pcibus_to_node(vmd->dev->bus);
|
|
|
|
vmd->irq_domain = pci_msi_create_irq_domain(NULL, &vmd_msi_domain_info,
|
|
x86_vector_domain);
|
|
if (!vmd->irq_domain)
|
|
return -ENODEV;
|
|
|
|
pci_add_resource(&resources, &vmd->resources[0]);
|
|
pci_add_resource(&resources, &vmd->resources[1]);
|
|
pci_add_resource(&resources, &vmd->resources[2]);
|
|
vmd->bus = pci_create_root_bus(&vmd->dev->dev, 0, &vmd_ops, sd,
|
|
&resources);
|
|
if (!vmd->bus) {
|
|
pci_free_resource_list(&resources);
|
|
irq_domain_remove(vmd->irq_domain);
|
|
return -ENODEV;
|
|
}
|
|
|
|
vmd_attach_resources(vmd);
|
|
vmd_setup_dma_ops(vmd);
|
|
dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
|
|
pci_rescan_bus(vmd->bus);
|
|
|
|
WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
|
|
"domain"), "Can't create symlink to domain\n");
|
|
return 0;
|
|
}
|
|
|
|
static irqreturn_t vmd_irq(int irq, void *data)
|
|
{
|
|
struct vmd_irq_list *irqs = data;
|
|
struct vmd_irq *vmdirq;
|
|
int idx;
|
|
|
|
idx = srcu_read_lock(&irqs->srcu);
|
|
list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
|
|
generic_handle_irq(vmdirq->virq);
|
|
srcu_read_unlock(&irqs->srcu, idx);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
|
|
{
|
|
struct vmd_dev *vmd;
|
|
int i, err;
|
|
|
|
if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))
|
|
return -ENOMEM;
|
|
|
|
vmd = devm_kzalloc(&dev->dev, sizeof(*vmd), GFP_KERNEL);
|
|
if (!vmd)
|
|
return -ENOMEM;
|
|
|
|
vmd->dev = dev;
|
|
err = pcim_enable_device(dev);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
|
|
if (!vmd->cfgbar)
|
|
return -ENOMEM;
|
|
|
|
pci_set_master(dev);
|
|
if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
|
|
dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)))
|
|
return -ENODEV;
|
|
|
|
vmd->msix_count = pci_msix_vec_count(dev);
|
|
if (vmd->msix_count < 0)
|
|
return -ENODEV;
|
|
|
|
vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
|
|
PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
|
|
if (vmd->msix_count < 0)
|
|
return vmd->msix_count;
|
|
|
|
vmd->irqs = devm_kcalloc(&dev->dev, vmd->msix_count, sizeof(*vmd->irqs),
|
|
GFP_KERNEL);
|
|
if (!vmd->irqs)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < vmd->msix_count; i++) {
|
|
err = init_srcu_struct(&vmd->irqs[i].srcu);
|
|
if (err)
|
|
return err;
|
|
|
|
INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
|
|
err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
|
|
vmd_irq, 0, "vmd", &vmd->irqs[i]);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
spin_lock_init(&vmd->cfg_lock);
|
|
pci_set_drvdata(dev, vmd);
|
|
err = vmd_enable_domain(vmd);
|
|
if (err)
|
|
return err;
|
|
|
|
dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
|
|
vmd->sysdata.domain);
|
|
return 0;
|
|
}
|
|
|
|
static void vmd_cleanup_srcu(struct vmd_dev *vmd)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < vmd->msix_count; i++)
|
|
cleanup_srcu_struct(&vmd->irqs[i].srcu);
|
|
}
|
|
|
|
static void vmd_remove(struct pci_dev *dev)
|
|
{
|
|
struct vmd_dev *vmd = pci_get_drvdata(dev);
|
|
|
|
vmd_detach_resources(vmd);
|
|
vmd_cleanup_srcu(vmd);
|
|
sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
|
|
pci_stop_root_bus(vmd->bus);
|
|
pci_remove_root_bus(vmd->bus);
|
|
vmd_teardown_dma_ops(vmd);
|
|
irq_domain_remove(vmd->irq_domain);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int vmd_suspend(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
pci_save_state(pdev);
|
|
return 0;
|
|
}
|
|
|
|
static int vmd_resume(struct device *dev)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(dev);
|
|
|
|
pci_restore_state(pdev);
|
|
return 0;
|
|
}
|
|
#endif
|
|
static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
|
|
|
|
static const struct pci_device_id vmd_ids[] = {
|
|
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x201d),},
|
|
{0,}
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, vmd_ids);
|
|
|
|
static struct pci_driver vmd_drv = {
|
|
.name = "vmd",
|
|
.id_table = vmd_ids,
|
|
.probe = vmd_probe,
|
|
.remove = vmd_remove,
|
|
.driver = {
|
|
.pm = &vmd_dev_pm_ops,
|
|
},
|
|
};
|
|
module_pci_driver(vmd_drv);
|
|
|
|
MODULE_AUTHOR("Intel Corporation");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_VERSION("0.6");
|