forked from Minki/linux
4257ac5acd
Add SPDX GPL-2.0 to numachip.c, which referred to the kernel default
"COPYING" file, which specifies GPL version 2.
Remove the boilerplate language referring to the GPL and "COPYING", relying
on the assertion in b24413180f ("License cleanup: add SPDX GPL-2.0
license identifier to files with no license") that the SPDX identifier may
be used instead of the full boilerplate text.
[bhelgaas: split to separate patch]
Link: https://lore.kernel.org/r/20190828135322.10370-1-kw@linux.com
Signed-off-by: Krzysztof Wilczynski <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
127 lines
2.8 KiB
C
127 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Numascale NumaConnect-specific PCI code
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*
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* Copyright (C) 2012 Numascale AS. All rights reserved.
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*
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* Send feedback to <support@numascale.com>
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*
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* PCI accessor functions derived from mmconfig_64.c
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*
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*/
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#include <linux/pci.h>
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#include <asm/pci_x86.h>
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static u8 limit __read_mostly;
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static inline char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
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{
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struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus);
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if (cfg && cfg->virt)
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return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));
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return NULL;
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}
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static int pci_mmcfg_read_numachip(unsigned int seg, unsigned int bus,
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unsigned int devfn, int reg, int len, u32 *value)
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{
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char __iomem *addr;
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/* Why do we have this when nobody checks it. How about a BUG()!? -AK */
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if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) {
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err: *value = -1;
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return -EINVAL;
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}
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/* Ensure AMD Northbridges don't decode reads to other devices */
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if (unlikely(bus == 0 && devfn >= limit)) {
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*value = -1;
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return 0;
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}
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rcu_read_lock();
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addr = pci_dev_base(seg, bus, devfn);
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if (!addr) {
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rcu_read_unlock();
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goto err;
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}
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switch (len) {
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case 1:
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*value = mmio_config_readb(addr + reg);
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break;
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case 2:
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*value = mmio_config_readw(addr + reg);
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break;
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case 4:
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*value = mmio_config_readl(addr + reg);
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break;
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}
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rcu_read_unlock();
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return 0;
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}
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static int pci_mmcfg_write_numachip(unsigned int seg, unsigned int bus,
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unsigned int devfn, int reg, int len, u32 value)
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{
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char __iomem *addr;
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/* Why do we have this when nobody checks it. How about a BUG()!? -AK */
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if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095)))
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return -EINVAL;
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/* Ensure AMD Northbridges don't decode writes to other devices */
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if (unlikely(bus == 0 && devfn >= limit))
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return 0;
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rcu_read_lock();
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addr = pci_dev_base(seg, bus, devfn);
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if (!addr) {
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rcu_read_unlock();
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return -EINVAL;
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}
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switch (len) {
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case 1:
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mmio_config_writeb(addr + reg, value);
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break;
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case 2:
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mmio_config_writew(addr + reg, value);
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break;
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case 4:
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mmio_config_writel(addr + reg, value);
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break;
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}
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rcu_read_unlock();
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return 0;
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}
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static const struct pci_raw_ops pci_mmcfg_numachip = {
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.read = pci_mmcfg_read_numachip,
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.write = pci_mmcfg_write_numachip,
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};
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int __init pci_numachip_init(void)
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{
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int ret = 0;
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u32 val;
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/* For remote I/O, restrict bus 0 access to the actual number of AMD
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Northbridges, which starts at device number 0x18 */
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ret = raw_pci_read(0, 0, PCI_DEVFN(0x18, 0), 0x60, sizeof(val), &val);
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if (ret)
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goto out;
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/* HyperTransport fabric size in bits 6:4 */
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limit = PCI_DEVFN(0x18 + ((val >> 4) & 7) + 1, 0);
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/* Use NumaChip PCI accessors for non-extended and extended access */
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raw_pci_ops = raw_pci_ext_ops = &pci_mmcfg_numachip;
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out:
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return ret;
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}
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