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[PATCH] x86_64: Clean and enhance up K8 northbridge access code
- Factor out the duplicated access/cache code into a single file * Shared between i386/x86-64. - Share flush code between AGP and IOMMU * Fix a bug: AGP didn't wait for end of flush before - Drop 8 northbridges limit and allocate dynamically - Add lock to serialize AGP and IOMMU GART flushes - Add PCI ID for next AMD northbridge - Random related cleanups The old K8 NUMA discovery code is unchanged. New systems should all use SRAT for this. Cc: "Navin Boppuri" <navin.boppuri@newisys.com> Cc: Dave Jones <davej@redhat.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Andi Kleen
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Linus Torvalds
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Jun 26, 2006
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* | ||
| * Shared support code for AMD K8 northbridges and derivates. | ||
| * Copyright 2006 Andi Kleen, SUSE Labs. Subject to GPLv2. | ||
| */ | ||
| #include <linux/gfp.h> | ||
| #include <linux/types.h> | ||
| #include <linux/init.h> | ||
| #include <linux/errno.h> | ||
| #include <linux/module.h> | ||
| #include <linux/spinlock.h> | ||
| #include <asm/k8.h> | ||
|
|
||
| int num_k8_northbridges; | ||
| EXPORT_SYMBOL(num_k8_northbridges); | ||
|
|
||
| static u32 *flush_words; | ||
|
|
||
| struct pci_device_id k8_nb_ids[] = { | ||
| { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1103) }, | ||
| { PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x1203) }, | ||
| {} | ||
| }; | ||
| EXPORT_SYMBOL(k8_nb_ids); | ||
|
|
||
| struct pci_dev **k8_northbridges; | ||
| EXPORT_SYMBOL(k8_northbridges); | ||
|
|
||
| static struct pci_dev *next_k8_northbridge(struct pci_dev *dev) | ||
| { | ||
| do { | ||
| dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev); | ||
| if (!dev) | ||
| break; | ||
| } while (!pci_match_id(&k8_nb_ids[0], dev)); | ||
| return dev; | ||
| } | ||
|
|
||
| int cache_k8_northbridges(void) | ||
| { | ||
| int i; | ||
| struct pci_dev *dev; | ||
| if (num_k8_northbridges) | ||
| return 0; | ||
|
|
||
| num_k8_northbridges = 0; | ||
| dev = NULL; | ||
| while ((dev = next_k8_northbridge(dev)) != NULL) | ||
| num_k8_northbridges++; | ||
|
|
||
| k8_northbridges = kmalloc((num_k8_northbridges + 1) * sizeof(void *), | ||
| GFP_KERNEL); | ||
| if (!k8_northbridges) | ||
| return -ENOMEM; | ||
|
|
||
| flush_words = kmalloc(num_k8_northbridges * sizeof(u32), GFP_KERNEL); | ||
| if (!flush_words) { | ||
| kfree(k8_northbridges); | ||
| return -ENOMEM; | ||
| } | ||
|
|
||
| dev = NULL; | ||
| i = 0; | ||
| while ((dev = next_k8_northbridge(dev)) != NULL) { | ||
| k8_northbridges[i++] = dev; | ||
| pci_read_config_dword(dev, 0x9c, &flush_words[i]); | ||
| } | ||
| k8_northbridges[i] = NULL; | ||
| return 0; | ||
| } | ||
| EXPORT_SYMBOL_GPL(cache_k8_northbridges); | ||
|
|
||
| /* Ignores subdevice/subvendor but as far as I can figure out | ||
| they're useless anyways */ | ||
| int __init early_is_k8_nb(u32 device) | ||
| { | ||
| struct pci_device_id *id; | ||
| u32 vendor = device & 0xffff; | ||
| device >>= 16; | ||
| for (id = k8_nb_ids; id->vendor; id++) | ||
| if (vendor == id->vendor && device == id->device) | ||
| return 1; | ||
| return 0; | ||
| } | ||
|
|
||
| void k8_flush_garts(void) | ||
| { | ||
| int flushed, i; | ||
| unsigned long flags; | ||
| static DEFINE_SPINLOCK(gart_lock); | ||
|
|
||
| /* Avoid races between AGP and IOMMU. In theory it's not needed | ||
| but I'm not sure if the hardware won't lose flush requests | ||
| when another is pending. This whole thing is so expensive anyways | ||
| that it doesn't matter to serialize more. -AK */ | ||
| spin_lock_irqsave(&gart_lock, flags); | ||
| flushed = 0; | ||
| for (i = 0; i < num_k8_northbridges; i++) { | ||
| pci_write_config_dword(k8_northbridges[i], 0x9c, | ||
| flush_words[i]|1); | ||
| flushed++; | ||
| } | ||
| for (i = 0; i < num_k8_northbridges; i++) { | ||
| u32 w; | ||
| /* Make sure the hardware actually executed the flush*/ | ||
| for (;;) { | ||
| pci_read_config_dword(k8_northbridges[i], | ||
| 0x9c, &w); | ||
| if (!(w & 1)) | ||
| break; | ||
| cpu_relax(); | ||
| } | ||
| } | ||
| spin_unlock_irqrestore(&gart_lock, flags); | ||
| if (!flushed) | ||
| printk("nothing to flush?\n"); | ||
| } | ||
| EXPORT_SYMBOL_GPL(k8_flush_garts); | ||
|
|
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