On Tue, Jul 19, 2022 at 09:45:58AM +0200, Arnd Bergmann wrote:
> On Tue, Jul 19, 2022 at 1:19 AM Stafford Horne <shorne@xxxxxxxxx> wrote:
> > On Mon, Jul 18, 2022, 3:56 PM Arnd Bergmann <arnd@xxxxxxxx> wrote:
> >>
> >> As mentioned before, it would be even better to just remove it
> >> entirely from everything except x86, and enclose the four
> >> references in an explicit "#ifdef X86_32". The variable declaration
> >> only exists because drivers/pci/quirks.c is compiled on all
> >> architecture, but the individual quirk is only active based on
> >> the PCI device ID of certain early PCI-ISA bridges.
> >
> >
> > Ok, I was thinking of that route but once I saw the pci device IDs I
> > wasn't so sure it was limited to x86. I'll go ahead with that approach.
>
> Ok, thanks!
>
> I checked all the PCI IDs yesterday, and I'm fairly sure they are x86
> specific. While some related products are general-purpose PCI-ISA
> bridges that have shown up on mips or arm boards, the ones listed
> here should all be safe.
This is what I have now, I will add a similar patch between 1/2 and 2/2, if this
looks ok.
It adds a few ifdef's which might be controversial but I think it provides more
cleanup than added complexity. I compile tested with x86_64, x86_32 and
OpenRISC.
diff --git a/arch/alpha/include/asm/dma.h b/arch/alpha/include/asm/dma.h
index 28610ea7786d..a04d76b96089 100644
--- a/arch/alpha/include/asm/dma.h
+++ b/arch/alpha/include/asm/dma.h
@@ -365,13 +365,4 @@ extern void free_dma(unsigned int dmanr); /* release it again */
#define KERNEL_HAVE_CHECK_DMA
extern int check_dma(unsigned int dmanr);
-/* From PCI */
-
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
-
#endif /* _ASM_DMA_H */
diff --git a/arch/arc/include/asm/dma.h b/arch/arc/include/asm/dma.h
index 5b744f4b10a7..02431027ed2f 100644
--- a/arch/arc/include/asm/dma.h
+++ b/arch/arc/include/asm/dma.h
@@ -7,10 +7,5 @@
#define ASM_ARC_DMA_H
#define MAX_DMA_ADDRESS 0xC0000000
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy 0
-#endif
#endif
diff --git a/arch/arm/include/asm/dma.h b/arch/arm/include/asm/dma.h
index a81dda65c576..907d139be431 100644
--- a/arch/arm/include/asm/dma.h
+++ b/arch/arm/include/asm/dma.h
@@ -143,10 +143,4 @@ extern int get_dma_residue(unsigned int chan);
#endif /* CONFIG_ISA_DMA_API */
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* __ASM_ARM_DMA_H */
diff --git a/arch/ia64/include/asm/dma.h b/arch/ia64/include/asm/dma.h
index 59625e9c1f9c..eaed2626ffda 100644
--- a/arch/ia64/include/asm/dma.h
+++ b/arch/ia64/include/asm/dma.h
@@ -12,8 +12,6 @@
extern unsigned long MAX_DMA_ADDRESS;
-extern int isa_dma_bridge_buggy;
-
#define free_dma(x)
#endif /* _ASM_IA64_DMA_H */
diff --git a/arch/m68k/include/asm/dma.h b/arch/m68k/include/asm/dma.h
index f6c5e0dfb4e5..1c8d9c5bc2fa 100644
--- a/arch/m68k/include/asm/dma.h
+++ b/arch/m68k/include/asm/dma.h
@@ -6,10 +6,4 @@
bootmem allocator (but this should do it for this) */
#define MAX_DMA_ADDRESS PAGE_OFFSET
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* _M68K_DMA_H */
diff --git a/arch/microblaze/include/asm/dma.h b/arch/microblaze/include/asm/dma.h
index f801582be912..7484c9eb66c4 100644
--- a/arch/microblaze/include/asm/dma.h
+++ b/arch/microblaze/include/asm/dma.h
@@ -9,10 +9,4 @@
/* Virtual address corresponding to last available physical memory address. */
#define MAX_DMA_ADDRESS (CONFIG_KERNEL_START + memory_size - 1)
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* _ASM_MICROBLAZE_DMA_H */
diff --git a/arch/mips/include/asm/dma.h b/arch/mips/include/asm/dma.h
index be726b943530..d6186e6bea7e 100644
--- a/arch/mips/include/asm/dma.h
+++ b/arch/mips/include/asm/dma.h
@@ -307,12 +307,4 @@ static __inline__ int get_dma_residue(unsigned int dmanr)
extern int request_dma(unsigned int dmanr, const char * device_id); /* reserve a DMA channel */
extern void free_dma(unsigned int dmanr); /* release it again */
-/* From PCI */
-
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* _ASM_DMA_H */
diff --git a/arch/parisc/include/asm/dma.h b/arch/parisc/include/asm/dma.h
index eea80ed34e6d..9e8c101de902 100644
--- a/arch/parisc/include/asm/dma.h
+++ b/arch/parisc/include/asm/dma.h
@@ -176,10 +176,4 @@ static __inline__ void set_dma_count(unsigned int dmanr, unsigned int count)
#define free_dma(dmanr)
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* _ASM_DMA_H */
diff --git a/arch/powerpc/include/asm/dma.h b/arch/powerpc/include/asm/dma.h
index 6161a9596196..d97c66d9ae34 100644
--- a/arch/powerpc/include/asm/dma.h
+++ b/arch/powerpc/include/asm/dma.h
@@ -340,11 +340,5 @@ extern int request_dma(unsigned int dmanr, const char *device_id);
/* release it again */
extern void free_dma(unsigned int dmanr);
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_DMA_H */
diff --git a/arch/s390/include/asm/dma.h b/arch/s390/include/asm/dma.h
index 6f26f35d4a71..dec1c4ce628c 100644
--- a/arch/s390/include/asm/dma.h
+++ b/arch/s390/include/asm/dma.h
@@ -11,10 +11,4 @@
*/
#define MAX_DMA_ADDRESS 0x80000000
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* _ASM_S390_DMA_H */
diff --git a/arch/sh/include/asm/dma.h b/arch/sh/include/asm/dma.h
index 17d23ae98c77..c8bee3f985a2 100644
--- a/arch/sh/include/asm/dma.h
+++ b/arch/sh/include/asm/dma.h
@@ -137,10 +137,4 @@ extern int register_chan_caps(const char *dmac, struct dma_chan_caps *capslist);
extern int dma_create_sysfs_files(struct dma_channel *, struct dma_info *);
extern void dma_remove_sysfs_files(struct dma_channel *, struct dma_info *);
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#endif /* __ASM_SH_DMA_H */
diff --git a/arch/sparc/include/asm/dma.h b/arch/sparc/include/asm/dma.h
index 462e7c794a09..08043f35b110 100644
--- a/arch/sparc/include/asm/dma.h
+++ b/arch/sparc/include/asm/dma.h
@@ -82,14 +82,6 @@
#define DMA_BURST64 0x40
#define DMA_BURSTBITS 0x7f
-/* From PCI */
-
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
#ifdef CONFIG_SPARC32
struct device;
diff --git a/arch/x86/include/asm/dma.h b/arch/x86/include/asm/dma.h
index 8e95aa4b0d17..0c34c658f57d 100644
--- a/arch/x86/include/asm/dma.h
+++ b/arch/x86/include/asm/dma.h
@@ -309,10 +309,12 @@ extern void free_dma(unsigned int dmanr);
/* From PCI */
+#ifdef CONFIG_X86_32
#ifdef CONFIG_PCI
extern int isa_dma_bridge_buggy;
#else
#define isa_dma_bridge_buggy (0)
-#endif
+#endif /* CONFIG_PCI */
+#endif /* CONFIG_X86_32 */
#endif /* _ASM_X86_DMA_H */
diff --git a/arch/xtensa/include/asm/dma.h b/arch/xtensa/include/asm/dma.h
index bb099a373b5a..172644539032 100644
--- a/arch/xtensa/include/asm/dma.h
+++ b/arch/xtensa/include/asm/dma.h
@@ -52,11 +52,4 @@
extern int request_dma(unsigned int dmanr, const char * device_id);
extern void free_dma(unsigned int dmanr);
-#ifdef CONFIG_PCI
-extern int isa_dma_bridge_buggy;
-#else
-#define isa_dma_bridge_buggy (0)
-#endif
-
-
#endif
diff --git a/drivers/comedi/drivers/comedi_isadma.c b/drivers/comedi/drivers/comedi_isadma.c
index 700982464c53..508421809128 100644
--- a/drivers/comedi/drivers/comedi_isadma.c
+++ b/drivers/comedi/drivers/comedi_isadma.c
@@ -104,8 +104,10 @@ unsigned int comedi_isadma_poll(struct comedi_isadma *dma)
flags = claim_dma_lock();
clear_dma_ff(desc->chan);
+#ifdef CONFIG_X86_32
if (!isa_dma_bridge_buggy)
disable_dma(desc->chan);
+#endif
result = get_dma_residue(desc->chan);
/*
* Read the counter again and choose higher value in order to
@@ -113,8 +115,10 @@ unsigned int comedi_isadma_poll(struct comedi_isadma *dma)
* isa_dma_bridge_buggy is set.
*/
result1 = get_dma_residue(desc->chan);
+#ifdef CONFIG_X86_32
if (!isa_dma_bridge_buggy)
enable_dma(desc->chan);
+#endif
release_dma_lock(flags);
if (result < result1)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index cfaf40a540a8..60c55d2cb2cc 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -41,8 +41,10 @@ const char *pci_power_names[] = {
};
EXPORT_SYMBOL_GPL(pci_power_names);
+#ifdef CONFIG_X86_32
int isa_dma_bridge_buggy;
EXPORT_SYMBOL(isa_dma_bridge_buggy);
+#endif
int pci_pci_problems;
EXPORT_SYMBOL(pci_pci_problems);
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 41aeaa235132..cb7715a0f339 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -239,6 +239,7 @@ static void quirk_passive_release(struct pci_dev *dev)
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441, quirk_passive_release);
DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441, quirk_passive_release);
+#ifdef CONFIG_X86_32
/*
* The VIA VP2/VP3/MVP3 seem to have some 'features'. There may be a
* workaround but VIA don't answer queries. If you happen to have good
@@ -265,6 +266,7 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, quirk_isa_dma
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_1, quirk_isa_dma_hangs);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_2, quirk_isa_dma_hangs);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_3, quirk_isa_dma_hangs);
+#endif
/*
* Intel NM10 "TigerPoint" LPC PM1a_STS.BM_STS must be clear
diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
index 556147983911..3ceb0cb12321 100644
--- a/include/asm-generic/pci.h
+++ b/include/asm-generic/pci.h
@@ -18,8 +18,6 @@
#define pcibios_assign_all_busses() 1
#endif
-extern int isa_dma_bridge_buggy;
-
/* Enable generic resource mapping code in drivers/pci/ */
#define ARCH_GENERIC_PCI_MMAP_RESOURCE
diff --git a/sound/core/isadma.c b/sound/core/isadma.c
index 1f45ede023b4..8a6397109c56 100644
--- a/sound/core/isadma.c
+++ b/sound/core/isadma.c
@@ -73,8 +73,10 @@ unsigned int snd_dma_pointer(unsigned long dma, unsigned int size)
flags = claim_dma_lock();
clear_dma_ff(dma);
+#ifdef CONFIG_X86_32
if (!isa_dma_bridge_buggy)
disable_dma(dma);
+#endif
result = get_dma_residue(dma);
/*
* HACK - read the counter again and choose higher value in order to
@@ -82,8 +84,10 @@ unsigned int snd_dma_pointer(unsigned long dma, unsigned int size)
* isa_dma_bridge_buggy is set.
*/
result1 = get_dma_residue(dma);
+#ifdef CONFIG_X86_32
if (!isa_dma_bridge_buggy)
enable_dma(dma);
+#endif
release_dma_lock(flags);
if (unlikely(result < result1))
result = result1;
