![Dan Williams](/assets/img/avatar_default.png)
Replace the current linked list munged into a ring with a native ring buffer implementation. The benefit of this approach is reduced overhead as many parameters can be derived from ring position with simple pointer comparisons and descriptor allocation/freeing becomes just a manipulation of head/tail pointers. It requires a contiguous allocation for the software descriptor information. Since this arrangement is significantly different from the ioat1 chain, move ioat2,3 support into its own file and header. Common routines are exported from driver/dma/ioat/dma.[ch]. Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
180 lines
5 KiB
C
180 lines
5 KiB
C
/*
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* Intel I/OAT DMA Linux driver
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* Copyright(c) 2007 - 2009 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 that 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.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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*/
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/*
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* This driver supports an Intel I/OAT DMA engine, which does asynchronous
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* copy operations.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/dca.h>
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#include "dma.h"
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#include "dma_v2.h"
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#include "registers.h"
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#include "hw.h"
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MODULE_VERSION(IOAT_DMA_VERSION);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Intel Corporation");
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static struct pci_device_id ioat_pci_tbl[] = {
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/* I/OAT v1 platforms */
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) },
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{ PCI_DEVICE(PCI_VENDOR_ID_UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) },
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/* I/OAT v2 platforms */
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) },
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/* I/OAT v3 platforms */
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
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{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
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{ 0, }
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};
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static int __devinit ioat_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *id);
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static void __devexit ioat_remove(struct pci_dev *pdev);
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static int ioat_dca_enabled = 1;
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module_param(ioat_dca_enabled, int, 0644);
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MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
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#define DRV_NAME "ioatdma"
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static struct pci_driver ioat_pci_driver = {
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.name = DRV_NAME,
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.id_table = ioat_pci_tbl,
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.probe = ioat_pci_probe,
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.remove = __devexit_p(ioat_remove),
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};
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static struct ioatdma_device *
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alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
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{
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struct device *dev = &pdev->dev;
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struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
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if (!d)
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return NULL;
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d->pdev = pdev;
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d->reg_base = iobase;
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return d;
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}
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static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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{
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void __iomem * const *iomap;
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struct device *dev = &pdev->dev;
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struct ioatdma_device *device;
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int err;
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err = pcim_enable_device(pdev);
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if (err)
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return err;
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err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
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if (err)
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return err;
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iomap = pcim_iomap_table(pdev);
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if (!iomap)
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return -ENOMEM;
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
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if (err)
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
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if (err)
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return err;
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err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
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if (err)
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err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
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if (err)
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return err;
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device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL);
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if (!device)
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return -ENOMEM;
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pci_set_master(pdev);
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device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
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if (!device)
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return -ENOMEM;
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pci_set_drvdata(pdev, device);
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device->version = readb(device->reg_base + IOAT_VER_OFFSET);
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if (device->version == IOAT_VER_1_2)
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err = ioat1_dma_probe(device, ioat_dca_enabled);
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else if (device->version == IOAT_VER_2_0)
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err = ioat2_dma_probe(device, ioat_dca_enabled);
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else if (device->version >= IOAT_VER_3_0)
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err = ioat3_dma_probe(device, ioat_dca_enabled);
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else
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return -ENODEV;
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if (err) {
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dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
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return -ENODEV;
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}
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return 0;
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}
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static void __devexit ioat_remove(struct pci_dev *pdev)
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{
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struct ioatdma_device *device = pci_get_drvdata(pdev);
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if (!device)
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return;
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dev_err(&pdev->dev, "Removing dma and dca services\n");
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if (device->dca) {
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unregister_dca_provider(device->dca);
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free_dca_provider(device->dca);
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device->dca = NULL;
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}
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ioat_dma_remove(device);
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}
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static int __init ioat_init_module(void)
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{
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return pci_register_driver(&ioat_pci_driver);
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}
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module_init(ioat_init_module);
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static void __exit ioat_exit_module(void)
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{
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pci_unregister_driver(&ioat_pci_driver);
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}
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module_exit(ioat_exit_module);
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