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Date: Thu, 9 Aug 2007 14:41:28 +0200 (CEST)
From: Andi Kleen <ak@...e.de>
To: dean@...tic.org, patches@...-64.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [1/12] x86: Work around mmio config space quirk on AMD Fam10h
From: dean gaudet <dean@...tic.org>
Some broken devices have been discovered to require %al/%ax/%eax registers
for MMIO config space accesses. Modify mmconfig.c to use these registers
explicitly (rather than modify the global readb/writeb/etc inlines).
AK: also changed i386 to always use eax
AK: moved change to extended space probing to different patch
AK: reworked with inlines according to Linus' requirements.
AK: improve comments.
Signed-off-by: dean gaudet <dean@...tic.org>
Signed-off-by: Andi Kleen <ak@...e.de>
---
arch/i386/pci/mmconfig.c | 14 ++++++--------
arch/i386/pci/pci.h | 43 +++++++++++++++++++++++++++++++++++++++++++
arch/x86_64/pci/mmconfig.c | 12 ++++++------
3 files changed, 55 insertions(+), 14 deletions(-)
Index: linux/arch/x86_64/pci/mmconfig.c
===================================================================
--- linux.orig/arch/x86_64/pci/mmconfig.c
+++ linux/arch/x86_64/pci/mmconfig.c
@@ -66,13 +66,13 @@ static int pci_mmcfg_read(unsigned int s
switch (len) {
case 1:
- *value = readb(addr + reg);
+ *value = mmio_config_readb(addr + reg);
break;
case 2:
- *value = readw(addr + reg);
+ *value = mmio_config_readw(addr + reg);
break;
case 4:
- *value = readl(addr + reg);
+ *value = mmio_config_readl(addr + reg);
break;
}
@@ -94,13 +94,13 @@ static int pci_mmcfg_write(unsigned int
switch (len) {
case 1:
- writeb(value, addr + reg);
+ mmio_config_writeb(addr + reg, value);
break;
case 2:
- writew(value, addr + reg);
+ mmio_config_writew(addr + reg, value);
break;
case 4:
- writel(value, addr + reg);
+ mmio_config_writel(addr + reg, value);
break;
}
Index: linux/arch/i386/pci/mmconfig.c
===================================================================
--- linux.orig/arch/i386/pci/mmconfig.c
+++ linux/arch/i386/pci/mmconfig.c
@@ -82,16 +82,15 @@ static int pci_mmcfg_read(unsigned int s
switch (len) {
case 1:
- *value = readb(mmcfg_virt_addr + reg);
+ *value = mmio_config_readb(mmcfg_virt_addr + reg);
break;
case 2:
- *value = readw(mmcfg_virt_addr + reg);
+ *value = mmio_config_readw(mmcfg_virt_addr + reg);
break;
case 4:
- *value = readl(mmcfg_virt_addr + reg);
+ *value = mmio_config_readl(mmcfg_virt_addr + reg);
break;
}
-
spin_unlock_irqrestore(&pci_config_lock, flags);
return 0;
@@ -116,16 +115,15 @@ static int pci_mmcfg_write(unsigned int
switch (len) {
case 1:
- writeb(value, mmcfg_virt_addr + reg);
+ mmio_config_writeb(mmcfg_virt_addr, value);
break;
case 2:
- writew(value, mmcfg_virt_addr + reg);
+ mmio_config_writew(mmcfg_virt_addr, value);
break;
case 4:
- writel(value, mmcfg_virt_addr + reg);
+ mmio_config_writel(mmcfg_virt_addr, value);
break;
}
-
spin_unlock_irqrestore(&pci_config_lock, flags);
return 0;
Index: linux/arch/i386/pci/pci.h
===================================================================
--- linux.orig/arch/i386/pci/pci.h
+++ linux/arch/i386/pci/pci.h
@@ -104,3 +104,46 @@ extern DECLARE_BITMAP(pci_mmcfg_fallback
extern int __init pci_mmcfg_arch_reachable(unsigned int seg, unsigned int bus,
unsigned int devfn);
extern int __init pci_mmcfg_arch_init(void);
+
+/*
+ * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
+ * on their northbrige except through the * %eax register. As such, you MUST
+ * NOT use normal IOMEM accesses, you need to only use the magic mmio-config
+ * accessor functions.
+ * In fact just use pci_config_*, nothing else please.
+ */
+static inline unsigned char mmio_config_readb(void __iomem *pos)
+{
+ u8 val;
+ asm volatile("movb (%1),%%al" : "=a" (val) : "r" (pos));
+ return val;
+}
+
+static inline unsigned short mmio_config_readw(void __iomem *pos)
+{
+ u16 val;
+ asm volatile("movw (%1),%%ax" : "=a" (val) : "r" (pos));
+ return val;
+}
+
+static inline unsigned int mmio_config_readl(void __iomem *pos)
+{
+ u32 val;
+ asm volatile("movl (%1),%%eax" : "=a" (val) : "r" (pos));
+ return val;
+}
+
+static inline void mmio_config_writeb(void __iomem *pos, u8 val)
+{
+ asm volatile("movb %%al,(%1)" :: "a" (val), "r" (pos) : "memory");
+}
+
+static inline void mmio_config_writew(void __iomem *pos, u16 val)
+{
+ asm volatile("movw %%ax,(%1)" :: "a" (val), "r" (pos) : "memory");
+}
+
+static inline void mmio_config_writel(void __iomem *pos, u32 val)
+{
+ asm volatile("movl %%eax,(%1)" :: "a" (val), "r" (pos) : "memory");
+}
-
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