mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 20:50:54 +07:00
87c6f40128
Impact: fix AMD Family 11h boot hangs / USB device problems The AMD Fam11h CPUs have a K8 northbridge. This northbridge is different from other family's because it lacks GART support (as I just learned). But the kernel implicitly expects a GART if it finds an AMD northbridge. Fix this by removing the Fam11h northbridge id from the scan list of K8 northbridges. This patch also changes the message in the GART driver about missing K8 northbridges to tell that the GART is missing which is the correct information in this case. Reported-by: Jouni Malinen <jkmalinen@gmail.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
124 lines
2.8 KiB
C
124 lines
2.8 KiB
C
/*
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* Shared support code for AMD K8 northbridges and derivates.
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* Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2.
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*/
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#include <linux/gfp.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <asm/k8.h>
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int num_k8_northbridges;
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EXPORT_SYMBOL(num_k8_northbridges);
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static u32 *flush_words;
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struct pci_device_id k8_nb_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
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{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
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{}
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};
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EXPORT_SYMBOL(k8_nb_ids);
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struct pci_dev **k8_northbridges;
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EXPORT_SYMBOL(k8_northbridges);
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static struct pci_dev *next_k8_northbridge(struct pci_dev *dev)
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{
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do {
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dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
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if (!dev)
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break;
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} while (!pci_match_id(&k8_nb_ids[0], dev));
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return dev;
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}
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int cache_k8_northbridges(void)
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{
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int i;
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struct pci_dev *dev;
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if (num_k8_northbridges)
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return 0;
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dev = NULL;
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while ((dev = next_k8_northbridge(dev)) != NULL)
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num_k8_northbridges++;
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k8_northbridges = kmalloc((num_k8_northbridges + 1) * sizeof(void *),
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GFP_KERNEL);
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if (!k8_northbridges)
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return -ENOMEM;
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if (!num_k8_northbridges) {
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k8_northbridges[0] = NULL;
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return 0;
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}
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flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL);
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if (!flush_words) {
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kfree(k8_northbridges);
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return -ENOMEM;
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}
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dev = NULL;
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i = 0;
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while ((dev = next_k8_northbridge(dev)) != NULL) {
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k8_northbridges[i] = dev;
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pci_read_config_dword(dev, 0x9c, &flush_words[i++]);
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}
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k8_northbridges[i] = NULL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(cache_k8_northbridges);
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/* Ignores subdevice/subvendor but as far as I can figure out
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they're useless anyways */
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int __init early_is_k8_nb(u32 device)
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{
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struct pci_device_id *id;
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u32 vendor = device & 0xffff;
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device >>= 16;
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for (id = k8_nb_ids; id->vendor; id++)
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if (vendor == id->vendor && device == id->device)
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return 1;
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return 0;
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}
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void k8_flush_garts(void)
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{
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int flushed, i;
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unsigned long flags;
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static DEFINE_SPINLOCK(gart_lock);
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/* Avoid races between AGP and IOMMU. In theory it's not needed
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but I'm not sure if the hardware won't lose flush requests
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when another is pending. This whole thing is so expensive anyways
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that it doesn't matter to serialize more. -AK */
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spin_lock_irqsave(&gart_lock, flags);
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flushed = 0;
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for (i = 0; i < num_k8_northbridges; i++) {
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pci_write_config_dword(k8_northbridges[i], 0x9c,
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flush_words[i]|1);
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flushed++;
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}
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for (i = 0; i < num_k8_northbridges; i++) {
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u32 w;
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/* Make sure the hardware actually executed the flush*/
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for (;;) {
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pci_read_config_dword(k8_northbridges[i],
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0x9c, &w);
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if (!(w & 1))
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break;
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cpu_relax();
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}
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}
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spin_unlock_irqrestore(&gart_lock, flags);
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if (!flushed)
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printk("nothing to flush?\n");
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}
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EXPORT_SYMBOL_GPL(k8_flush_garts);
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