mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:56:39 +07:00
068258bc15
Fix mmconfig detection to not assume a single mmconfig space in the northbridge, paving the way for AMD fam10h + mcp55 CPUs. On those, the MSR has some range, but the mcp55 pci config will have another one. Also helps the mcp55 + io55 case, where every one will have one range. If it is mcp55, exclude the range that is used by CPU MSR, in other words , if the CPU claims busses 0-255, the range in mcp55 is dropped, because CPU HW will not route those ranges to mcp55 mmconfig to handle it. Signed-off-by: Yinghai Lu <yinghai.lu@kernel.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
174 lines
3.9 KiB
C
174 lines
3.9 KiB
C
/*
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* mmconfig.c - Low-level direct PCI config space access via MMCONFIG
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*
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* This is an 64bit optimized version that always keeps the full mmconfig
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* space mapped. This allows lockless config space operation.
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*/
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/bitmap.h>
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#include <asm/e820.h>
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#include <asm/pci_x86.h>
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/* Static virtual mapping of the MMCONFIG aperture */
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struct mmcfg_virt {
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struct acpi_mcfg_allocation *cfg;
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char __iomem *virt;
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};
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static struct mmcfg_virt *pci_mmcfg_virt;
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static char __iomem *get_virt(unsigned int seg, unsigned bus)
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{
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struct acpi_mcfg_allocation *cfg;
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int cfg_num;
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for (cfg_num = 0; cfg_num < pci_mmcfg_config_num; cfg_num++) {
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cfg = pci_mmcfg_virt[cfg_num].cfg;
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if (cfg->pci_segment == seg &&
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(cfg->start_bus_number <= bus) &&
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(cfg->end_bus_number >= bus))
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return pci_mmcfg_virt[cfg_num].virt;
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}
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/* Fall back to type 0 */
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return NULL;
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}
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static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn)
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{
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char __iomem *addr;
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addr = get_virt(seg, bus);
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if (!addr)
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return NULL;
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return addr + ((bus << 20) | (devfn << 12));
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}
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static int pci_mmcfg_read(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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addr = pci_dev_base(seg, bus, devfn);
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if (!addr)
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goto err;
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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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return 0;
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}
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static int pci_mmcfg_write(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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addr = pci_dev_base(seg, bus, devfn);
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if (!addr)
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return -EINVAL;
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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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return 0;
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}
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static struct pci_raw_ops pci_mmcfg = {
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.read = pci_mmcfg_read,
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.write = pci_mmcfg_write,
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};
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static void __iomem * __init mcfg_ioremap(struct acpi_mcfg_allocation *cfg)
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{
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void __iomem *addr;
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u64 start, size;
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start = cfg->start_bus_number;
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start <<= 20;
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start += cfg->address;
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size = cfg->end_bus_number + 1 - cfg->start_bus_number;
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size <<= 20;
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addr = ioremap_nocache(start, size);
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if (addr) {
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printk(KERN_INFO "PCI: Using MMCONFIG at %Lx - %Lx\n",
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start, start + size - 1);
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addr -= cfg->start_bus_number << 20;
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}
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return addr;
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}
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int __init pci_mmcfg_arch_init(void)
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{
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int i;
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pci_mmcfg_virt = kzalloc(sizeof(*pci_mmcfg_virt) *
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pci_mmcfg_config_num, GFP_KERNEL);
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if (pci_mmcfg_virt == NULL) {
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printk(KERN_ERR "PCI: Can not allocate memory for mmconfig structures\n");
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return 0;
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}
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for (i = 0; i < pci_mmcfg_config_num; ++i) {
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pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i];
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pci_mmcfg_virt[i].virt = mcfg_ioremap(&pci_mmcfg_config[i]);
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if (!pci_mmcfg_virt[i].virt) {
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printk(KERN_ERR "PCI: Cannot map mmconfig aperture for "
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"segment %d\n",
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pci_mmcfg_config[i].pci_segment);
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pci_mmcfg_arch_free();
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return 0;
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}
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}
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raw_pci_ext_ops = &pci_mmcfg;
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return 1;
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}
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void __init pci_mmcfg_arch_free(void)
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{
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int i;
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if (pci_mmcfg_virt == NULL)
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return;
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for (i = 0; i < pci_mmcfg_config_num; ++i) {
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if (pci_mmcfg_virt[i].virt) {
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iounmap(pci_mmcfg_virt[i].virt + (pci_mmcfg_virt[i].cfg->start_bus_number << 20));
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pci_mmcfg_virt[i].virt = NULL;
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pci_mmcfg_virt[i].cfg = NULL;
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}
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}
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kfree(pci_mmcfg_virt);
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pci_mmcfg_virt = NULL;
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}
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