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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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efaf30a335
The 'xen_hvm_resume_frames' used to be an 'unsigned long' and contain the virtual address of the grants. That was OK for most architectures (PVHVM, ARM) were the grants are contiguous in memory. That however is not the case for PVH - in which case we will have to do a lookup for each virtual address for the PFN. Instead of doing that, lets make it a structure which will contain the array of PFNs, the virtual address and the count of said PFNs. Also provide a generic functions: gnttab_setup_auto_xlat_frames and gnttab_free_auto_xlat_frames to populate said structure with appropriate values for PVHVM and ARM. To round it off, change the name from 'xen_hvm_resume_frames' to a more descriptive one - 'xen_auto_xlat_grant_frames'. For PVH, in patch "xen/pvh: Piggyback on PVHVM for grant driver" we will populate the 'xen_auto_xlat_grant_frames' by ourselves. v2 moves the xen_remap in the gnttab_setup_auto_xlat_frames and also introduces xen_unmap for gnttab_free_auto_xlat_frames. Suggested-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [v3: Based on top of 'asm/xen/page.h: remove redundant semicolon'] Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
200 lines
4.7 KiB
C
200 lines
4.7 KiB
C
/******************************************************************************
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* platform-pci.c
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*
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* Xen platform PCI device driver
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* Copyright (c) 2005, Intel Corporation.
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* Copyright (c) 2007, XenSource Inc.
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* Copyright (c) 2010, Citrix
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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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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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*/
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <xen/platform_pci.h>
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#include <xen/grant_table.h>
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#include <xen/xenbus.h>
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#include <xen/events.h>
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#include <xen/hvm.h>
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#include <xen/xen-ops.h>
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#define DRV_NAME "xen-platform-pci"
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MODULE_AUTHOR("ssmith@xensource.com and stefano.stabellini@eu.citrix.com");
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MODULE_DESCRIPTION("Xen platform PCI device");
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MODULE_LICENSE("GPL");
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static unsigned long platform_mmio;
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static unsigned long platform_mmio_alloc;
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static unsigned long platform_mmiolen;
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static uint64_t callback_via;
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unsigned long alloc_xen_mmio(unsigned long len)
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{
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unsigned long addr;
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addr = platform_mmio + platform_mmio_alloc;
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platform_mmio_alloc += len;
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BUG_ON(platform_mmio_alloc > platform_mmiolen);
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return addr;
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}
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static uint64_t get_callback_via(struct pci_dev *pdev)
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{
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u8 pin;
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int irq;
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irq = pdev->irq;
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if (irq < 16)
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return irq; /* ISA IRQ */
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pin = pdev->pin;
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/* We don't know the GSI. Specify the PCI INTx line instead. */
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return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
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((uint64_t)pci_domain_nr(pdev->bus) << 32) |
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((uint64_t)pdev->bus->number << 16) |
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((uint64_t)(pdev->devfn & 0xff) << 8) |
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((uint64_t)(pin - 1) & 3);
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}
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static irqreturn_t do_hvm_evtchn_intr(int irq, void *dev_id)
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{
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xen_hvm_evtchn_do_upcall();
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return IRQ_HANDLED;
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}
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static int xen_allocate_irq(struct pci_dev *pdev)
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{
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return request_irq(pdev->irq, do_hvm_evtchn_intr,
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IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
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"xen-platform-pci", pdev);
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}
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static int platform_pci_resume(struct pci_dev *pdev)
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{
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int err;
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if (xen_have_vector_callback)
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return 0;
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err = xen_set_callback_via(callback_via);
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if (err) {
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dev_err(&pdev->dev, "platform_pci_resume failure!\n");
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return err;
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}
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return 0;
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}
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static int platform_pci_init(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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int i, ret;
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long ioaddr;
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long mmio_addr, mmio_len;
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unsigned int max_nr_gframes;
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unsigned long grant_frames;
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if (!xen_domain())
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return -ENODEV;
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i = pci_enable_device(pdev);
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if (i)
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return i;
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ioaddr = pci_resource_start(pdev, 0);
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mmio_addr = pci_resource_start(pdev, 1);
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mmio_len = pci_resource_len(pdev, 1);
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if (mmio_addr == 0 || ioaddr == 0) {
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dev_err(&pdev->dev, "no resources found\n");
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ret = -ENOENT;
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goto pci_out;
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}
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ret = pci_request_region(pdev, 1, DRV_NAME);
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if (ret < 0)
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goto pci_out;
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ret = pci_request_region(pdev, 0, DRV_NAME);
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if (ret < 0)
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goto mem_out;
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platform_mmio = mmio_addr;
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platform_mmiolen = mmio_len;
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if (!xen_have_vector_callback) {
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ret = xen_allocate_irq(pdev);
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if (ret) {
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dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);
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goto out;
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}
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callback_via = get_callback_via(pdev);
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ret = xen_set_callback_via(callback_via);
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if (ret) {
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dev_warn(&pdev->dev, "Unable to set the evtchn callback "
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"err=%d\n", ret);
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goto out;
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}
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}
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max_nr_gframes = gnttab_max_grant_frames();
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grant_frames = alloc_xen_mmio(PAGE_SIZE * max_nr_gframes);
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if (gnttab_setup_auto_xlat_frames(grant_frames))
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goto out;
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ret = gnttab_init();
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if (ret)
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goto grant_out;
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xenbus_probe(NULL);
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return 0;
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grant_out:
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gnttab_free_auto_xlat_frames();
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out:
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pci_release_region(pdev, 0);
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mem_out:
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pci_release_region(pdev, 1);
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pci_out:
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pci_disable_device(pdev);
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return ret;
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}
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static struct pci_device_id platform_pci_tbl[] = {
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{PCI_VENDOR_ID_XEN, PCI_DEVICE_ID_XEN_PLATFORM,
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PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
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{0,}
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};
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MODULE_DEVICE_TABLE(pci, platform_pci_tbl);
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static struct pci_driver platform_driver = {
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.name = DRV_NAME,
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.probe = platform_pci_init,
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.id_table = platform_pci_tbl,
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#ifdef CONFIG_PM
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.resume_early = platform_pci_resume,
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#endif
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};
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static int __init platform_pci_module_init(void)
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{
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return pci_register_driver(&platform_driver);
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}
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module_init(platform_pci_module_init);
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