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kernel_optimize_test/drivers/dma/dw-edma/dw-edma-pcie.c
Alan Mikhak fc6f5d0a49 dmaengine: dw-edma: Decouple dw-edma-core.c from struct pci_dev 
Decouple dw-edma-core.c from struct pci_dev as a step toward integration
of dw-edma with pci-epf-test so the latter can initiate dma operations
locally from the endpoint side. A barrier to such integration is the
dependency of dw_edma_probe() and other functions in dw-edma-core.c on
struct pci_dev.

The Synopsys DesignWare dw-edma driver was designed to run on host side
of PCIe link to initiate DMA operations remotely using eDMA channels of
PCIe controller on the endpoint side. This can be inferred from seeing
that dw-edma uses struct pci_dev and accesses hardware registers of dma
channels across the bus using BAR0 and BAR2.

The ops field of struct dw_edma in dw-edma-core.h is currenty undefined:

const struct dw_edma_core_ops   *ops;

However, the kernel builds without failure even when dw-edma driver is
enabled. Instead of removing the currently undefined and usued ops field,
define struct dw_edma_core_ops and use the ops field to decouple
dw-edma-core.c from struct pci_dev.

Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/1586971629-30196-1-git-send-email-alan.mikhak@sifive.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-04-17 17:20:20 +05:30

240 lines
6.1 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
* Synopsys DesignWare eDMA PCIe driver
*
* Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/dma/edma.h>
#include <linux/pci-epf.h>
#include <linux/msi.h>
#include "dw-edma-core.h"
struct dw_edma_pcie_data {
/* eDMA registers location */
enum pci_barno rg_bar;
off_t rg_off;
size_t rg_sz;
/* eDMA memory linked list location */
enum pci_barno ll_bar;
off_t ll_off;
size_t ll_sz;
/* eDMA memory data location */
enum pci_barno dt_bar;
off_t dt_off;
size_t dt_sz;
/* Other */
u32 version;
enum dw_edma_mode mode;
u8 irqs;
};
static const struct dw_edma_pcie_data snps_edda_data = {
/* eDMA registers location */
.rg_bar = BAR_0,
.rg_off = 0x00001000, /* 4 Kbytes */
.rg_sz = 0x00002000, /* 8 Kbytes */
/* eDMA memory linked list location */
.ll_bar = BAR_2,
.ll_off = 0x00000000, /* 0 Kbytes */
.ll_sz = 0x00800000, /* 8 Mbytes */
/* eDMA memory data location */
.dt_bar = BAR_2,
.dt_off = 0x00800000, /* 8 Mbytes */
.dt_sz = 0x03800000, /* 56 Mbytes */
/* Other */
.version = 0,
.mode = EDMA_MODE_UNROLL,
.irqs = 1,
};
static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
{
return pci_irq_vector(to_pci_dev(dev), nr);
}
static const struct dw_edma_core_ops dw_edma_pcie_core_ops = {
.irq_vector = dw_edma_pcie_irq_vector,
};
static int dw_edma_pcie_probe(struct pci_dev *pdev,
const struct pci_device_id *pid)
{
const struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
struct device *dev = &pdev->dev;
struct dw_edma_chip *chip;
int err, nr_irqs;
struct dw_edma *dw;
/* Enable PCI device */
err = pcim_enable_device(pdev);
if (err) {
pci_err(pdev, "enabling device failed\n");
return err;
}
/* Mapping PCI BAR regions */
err = pcim_iomap_regions(pdev, BIT(pdata->rg_bar) |
BIT(pdata->ll_bar) |
BIT(pdata->dt_bar),
pci_name(pdev));
if (err) {
pci_err(pdev, "eDMA BAR I/O remapping failed\n");
return err;
}
pci_set_master(pdev);
/* DMA configuration */
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (!err) {
err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
if (err) {
pci_err(pdev, "consistent DMA mask 64 set failed\n");
return err;
}
} else {
pci_err(pdev, "DMA mask 64 set failed\n");
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err) {
pci_err(pdev, "DMA mask 32 set failed\n");
return err;
}
err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (err) {
pci_err(pdev, "consistent DMA mask 32 set failed\n");
return err;
}
}
/* Data structure allocation */
chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
dw = devm_kzalloc(dev, sizeof(*dw), GFP_KERNEL);
if (!dw)
return -ENOMEM;
/* IRQs allocation */
nr_irqs = pci_alloc_irq_vectors(pdev, 1, pdata->irqs,
PCI_IRQ_MSI | PCI_IRQ_MSIX);
if (nr_irqs < 1) {
pci_err(pdev, "fail to alloc IRQ vector (number of IRQs=%u)\n",
nr_irqs);
return -EPERM;
}
/* Data structure initialization */
chip->dw = dw;
chip->dev = dev;
chip->id = pdev->devfn;
chip->irq = pdev->irq;
dw->rg_region.vaddr = pcim_iomap_table(pdev)[pdata->rg_bar];
dw->rg_region.vaddr += pdata->rg_off;
dw->rg_region.paddr = pdev->resource[pdata->rg_bar].start;
dw->rg_region.paddr += pdata->rg_off;
dw->rg_region.sz = pdata->rg_sz;
dw->ll_region.vaddr = pcim_iomap_table(pdev)[pdata->ll_bar];
dw->ll_region.vaddr += pdata->ll_off;
dw->ll_region.paddr = pdev->resource[pdata->ll_bar].start;
dw->ll_region.paddr += pdata->ll_off;
dw->ll_region.sz = pdata->ll_sz;
dw->dt_region.vaddr = pcim_iomap_table(pdev)[pdata->dt_bar];
dw->dt_region.vaddr += pdata->dt_off;
dw->dt_region.paddr = pdev->resource[pdata->dt_bar].start;
dw->dt_region.paddr += pdata->dt_off;
dw->dt_region.sz = pdata->dt_sz;
dw->version = pdata->version;
dw->mode = pdata->mode;
dw->nr_irqs = nr_irqs;
dw->ops = &dw_edma_pcie_core_ops;
/* Debug info */
pci_dbg(pdev, "Version:\t%u\n", dw->version);
pci_dbg(pdev, "Mode:\t%s\n",
dw->mode == EDMA_MODE_LEGACY ? "Legacy" : "Unroll");
pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
pdata->rg_bar, pdata->rg_off, pdata->rg_sz,
dw->rg_region.vaddr, &dw->rg_region.paddr);
pci_dbg(pdev, "L. List:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
pdata->ll_bar, pdata->ll_off, pdata->ll_sz,
dw->ll_region.vaddr, &dw->ll_region.paddr);
pci_dbg(pdev, "Data:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
pdata->dt_bar, pdata->dt_off, pdata->dt_sz,
dw->dt_region.vaddr, &dw->dt_region.paddr);
pci_dbg(pdev, "Nr. IRQs:\t%u\n", dw->nr_irqs);
/* Validating if PCI interrupts were enabled */
if (!pci_dev_msi_enabled(pdev)) {
pci_err(pdev, "enable interrupt failed\n");
return -EPERM;
}
dw->irq = devm_kcalloc(dev, nr_irqs, sizeof(*dw->irq), GFP_KERNEL);
if (!dw->irq)
return -ENOMEM;
/* Starting eDMA driver */
err = dw_edma_probe(chip);
if (err) {
pci_err(pdev, "eDMA probe failed\n");
return err;
}
/* Saving data structure reference */
pci_set_drvdata(pdev, chip);
return 0;
}
static void dw_edma_pcie_remove(struct pci_dev *pdev)
{
struct dw_edma_chip *chip = pci_get_drvdata(pdev);
int err;
/* Stopping eDMA driver */
err = dw_edma_remove(chip);
if (err)
pci_warn(pdev, "can't remove device properly: %d\n", err);
/* Freeing IRQs */
pci_free_irq_vectors(pdev);
}
static const struct pci_device_id dw_edma_pcie_id_table[] = {
{ PCI_DEVICE_DATA(SYNOPSYS, EDDA, &snps_edda_data) },
{ }
};
MODULE_DEVICE_TABLE(pci, dw_edma_pcie_id_table);
static struct pci_driver dw_edma_pcie_driver = {
.name = "dw-edma-pcie",
.id_table = dw_edma_pcie_id_table,
.probe = dw_edma_pcie_probe,
.remove = dw_edma_pcie_remove,
};
module_pci_driver(dw_edma_pcie_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys DesignWare eDMA PCIe driver");
MODULE_AUTHOR("Gustavo Pimentel <gustavo.pimentel@synopsys.com>");
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