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linux_dsm_epyc7002/arch/powerpc/platforms/powernv/pci-p5ioc2.c
Alexey Kardashevskiy 4e13c1ac6b powerpc/vfio: Enable on PowerNV platform 
This initializes IOMMU groups based on the IOMMU configuration
discovered during the PCI scan on POWERNV (POWER non virtualized)
platform.  The IOMMU groups are to be used later by the VFIO driver,
which is used for PCI pass through.

It also implements an API for mapping/unmapping pages for
guest PCI drivers and providing DMA window properties.
This API is going to be used later by QEMU-VFIO to handle
h_put_tce hypercalls from the KVM guest.

The iommu_put_tce_user_mode() does only a single page mapping
as an API for adding many mappings at once is going to be
added later.

Although this driver has been tested only on the POWERNV
platform, it should work on any platform which supports
TCE tables.  As h_put_tce hypercall is received by the host
kernel and processed by the QEMU (what involves calling
the host kernel again), performance is not the best -
circa 220MB/s on 10Gb ethernet network.

To enable VFIO on POWER, enable SPAPR_TCE_IOMMU config
option and configure VFIO as required.

Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-06-20 16:55:14 +10:00

237 lines
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/*
* Support PCI/PCIe on PowerNV platforms
*
* Currently supports only P5IOC2
*
* Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/ppc-pci.h>
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include "powernv.h"
#include "pci.h"
/* For now, use a fixed amount of TCE memory for each p5ioc2
* hub, 16M will do
*/
#define P5IOC2_TCE_MEMORY 0x01000000
#ifdef CONFIG_PCI_MSI
static int pnv_pci_p5ioc2_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
unsigned int hwirq, unsigned int virq,
unsigned int is_64, struct msi_msg *msg)
{
if (WARN_ON(!is_64))
return -ENXIO;
msg->data = hwirq - phb->msi_base;
msg->address_hi = 0x10000000;
msg->address_lo = 0;
return 0;
}
static void pnv_pci_init_p5ioc2_msis(struct pnv_phb *phb)
{
unsigned int count;
const __be32 *prop = of_get_property(phb->hose->dn,
"ibm,opal-msi-ranges", NULL);
if (!prop)
return;
/* Don't do MSI's on p5ioc2 PCI-X are they are not properly
* verified in HW
*/
if (of_device_is_compatible(phb->hose->dn, "ibm,p5ioc2-pcix"))
return;
phb->msi_base = be32_to_cpup(prop);
count = be32_to_cpup(prop + 1);
if (msi_bitmap_alloc(&phb->msi_bmp, count, phb->hose->dn)) {
pr_err("PCI %d: Failed to allocate MSI bitmap !\n",
phb->hose->global_number);
return;
}
phb->msi_setup = pnv_pci_p5ioc2_msi_setup;
phb->msi32_support = 0;
pr_info(" Allocated bitmap for %d MSIs (base IRQ 0x%x)\n",
count, phb->msi_base);
}
#else
static void pnv_pci_init_p5ioc2_msis(struct pnv_phb *phb) { }
#endif /* CONFIG_PCI_MSI */
static void pnv_pci_p5ioc2_dma_dev_setup(struct pnv_phb *phb,
struct pci_dev *pdev)
{
if (phb->p5ioc2.iommu_table.it_map == NULL) {
iommu_init_table(&phb->p5ioc2.iommu_table, phb->hose->node);
iommu_register_group(&phb->p5ioc2.iommu_table,
pci_domain_nr(phb->hose->bus), phb->opal_id);
}
set_iommu_table_base(&pdev->dev, &phb->p5ioc2.iommu_table);
}
static void __init pnv_pci_init_p5ioc2_phb(struct device_node *np,
void *tce_mem, u64 tce_size)
{
struct pnv_phb *phb;
const u64 *prop64;
u64 phb_id;
int64_t rc;
static int primary = 1;
pr_info(" Initializing p5ioc2 PHB %s\n", np->full_name);
prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
if (!prop64) {
pr_err(" Missing \"ibm,opal-phbid\" property !\n");
return;
}
phb_id = be64_to_cpup(prop64);
pr_devel(" PHB-ID : 0x%016llx\n", phb_id);
pr_devel(" TCE AT : 0x%016lx\n", __pa(tce_mem));
pr_devel(" TCE SZ : 0x%016llx\n", tce_size);
rc = opal_pci_set_phb_tce_memory(phb_id, __pa(tce_mem), tce_size);
if (rc != OPAL_SUCCESS) {
pr_err(" Failed to set TCE memory, OPAL error %lld\n", rc);
return;
}
phb = alloc_bootmem(sizeof(struct pnv_phb));
if (phb) {
memset(phb, 0, sizeof(struct pnv_phb));
phb->hose = pcibios_alloc_controller(np);
}
if (!phb || !phb->hose) {
pr_err(" Failed to allocate PCI controller\n");
return;
}
spin_lock_init(&phb->lock);
phb->hose->first_busno = 0;
phb->hose->last_busno = 0xff;
phb->hose->private_data = phb;
phb->opal_id = phb_id;
phb->type = PNV_PHB_P5IOC2;
phb->model = PNV_PHB_MODEL_P5IOC2;
phb->regs = of_iomap(np, 0);
if (phb->regs == NULL)
pr_err(" Failed to map registers !\n");
else {
pr_devel(" P_BUID = 0x%08x\n", in_be32(phb->regs + 0x100));
pr_devel(" P_IOSZ = 0x%08x\n", in_be32(phb->regs + 0x1b0));
pr_devel(" P_IO_ST = 0x%08x\n", in_be32(phb->regs + 0x1e0));
pr_devel(" P_MEM1_H = 0x%08x\n", in_be32(phb->regs + 0x1a0));
pr_devel(" P_MEM1_L = 0x%08x\n", in_be32(phb->regs + 0x190));
pr_devel(" P_MSZ1_L = 0x%08x\n", in_be32(phb->regs + 0x1c0));
pr_devel(" P_MEM_ST = 0x%08x\n", in_be32(phb->regs + 0x1d0));
pr_devel(" P_MEM2_H = 0x%08x\n", in_be32(phb->regs + 0x2c0));
pr_devel(" P_MEM2_L = 0x%08x\n", in_be32(phb->regs + 0x2b0));
pr_devel(" P_MSZ2_H = 0x%08x\n", in_be32(phb->regs + 0x2d0));
pr_devel(" P_MSZ2_L = 0x%08x\n", in_be32(phb->regs + 0x2e0));
}
/* Interpret the "ranges" property */
/* This also maps the I/O region and sets isa_io/mem_base */
pci_process_bridge_OF_ranges(phb->hose, np, primary);
primary = 0;
phb->hose->ops = &pnv_pci_ops;
/* Setup MSI support */
pnv_pci_init_p5ioc2_msis(phb);
/* Setup TCEs */
phb->dma_dev_setup = pnv_pci_p5ioc2_dma_dev_setup;
pnv_pci_setup_iommu_table(&phb->p5ioc2.iommu_table,
tce_mem, tce_size, 0);
}
void __init pnv_pci_init_p5ioc2_hub(struct device_node *np)
{
struct device_node *phbn;
const u64 *prop64;
u64 hub_id;
void *tce_mem;
uint64_t tce_per_phb;
int64_t rc;
int phb_count = 0;
pr_info("Probing p5ioc2 IO-Hub %s\n", np->full_name);
prop64 = of_get_property(np, "ibm,opal-hubid", NULL);
if (!prop64) {
pr_err(" Missing \"ibm,opal-hubid\" property !\n");
return;
}
hub_id = be64_to_cpup(prop64);
pr_info(" HUB-ID : 0x%016llx\n", hub_id);
/* Currently allocate 16M of TCE memory for every Hub
*
* XXX TODO: Make it chip local if possible
*/
tce_mem = __alloc_bootmem(P5IOC2_TCE_MEMORY, P5IOC2_TCE_MEMORY,
__pa(MAX_DMA_ADDRESS));
if (!tce_mem) {
pr_err(" Failed to allocate TCE Memory !\n");
return;
}
pr_debug(" TCE : 0x%016lx..0x%016lx\n",
__pa(tce_mem), __pa(tce_mem) + P5IOC2_TCE_MEMORY - 1);
rc = opal_pci_set_hub_tce_memory(hub_id, __pa(tce_mem),
P5IOC2_TCE_MEMORY);
if (rc != OPAL_SUCCESS) {
pr_err(" Failed to allocate TCE memory, OPAL error %lld\n", rc);
return;
}
/* Count child PHBs */
for_each_child_of_node(np, phbn) {
if (of_device_is_compatible(phbn, "ibm,p5ioc2-pcix") ||
of_device_is_compatible(phbn, "ibm,p5ioc2-pciex"))
phb_count++;
}
/* Calculate how much TCE space we can give per PHB */
tce_per_phb = __rounddown_pow_of_two(P5IOC2_TCE_MEMORY / phb_count);
pr_info(" Allocating %lld MB of TCE memory per PHB\n",
tce_per_phb >> 20);
/* Initialize PHBs */
for_each_child_of_node(np, phbn) {
if (of_device_is_compatible(phbn, "ibm,p5ioc2-pcix") ||
of_device_is_compatible(phbn, "ibm,p5ioc2-pciex")) {
pnv_pci_init_p5ioc2_phb(phbn, tce_mem, tce_per_phb);
tce_mem += tce_per_phb;
}
}
}
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