diff options
49 files changed, 314 insertions, 377 deletions
diff --git a/Documentation/core-api/bus-virt-phys-mapping.rst b/Documentation/core-api/bus-virt-phys-mapping.rst deleted file mode 100644 index c72b24a7d52c..000000000000 --- a/Documentation/core-api/bus-virt-phys-mapping.rst +++ /dev/null @@ -1,220 +0,0 @@ -========================================================== -How to access I/O mapped memory from within device drivers -========================================================== - -:Author: Linus - -.. warning:: - - The virt_to_bus() and bus_to_virt() functions have been - superseded by the functionality provided by the PCI DMA interface - (see Documentation/core-api/dma-api-howto.rst). They continue - to be documented below for historical purposes, but new code - must not use them. --davidm 00/12/12 - -:: - - [ This is a mail message in response to a query on IO mapping, thus the - strange format for a "document" ] - -The AHA-1542 is a bus-master device, and your patch makes the driver give the -controller the physical address of the buffers, which is correct on x86 -(because all bus master devices see the physical memory mappings directly). - -However, on many setups, there are actually **three** different ways of looking -at memory addresses, and in this case we actually want the third, the -so-called "bus address". - -Essentially, the three ways of addressing memory are (this is "real memory", -that is, normal RAM--see later about other details): - - - CPU untranslated. This is the "physical" address. Physical address - 0 is what the CPU sees when it drives zeroes on the memory bus. - - - CPU translated address. This is the "virtual" address, and is - completely internal to the CPU itself with the CPU doing the appropriate - translations into "CPU untranslated". - - - bus address. This is the address of memory as seen by OTHER devices, - not the CPU. Now, in theory there could be many different bus - addresses, with each device seeing memory in some device-specific way, but - happily most hardware designers aren't actually actively trying to make - things any more complex than necessary, so you can assume that all - external hardware sees the memory the same way. - -Now, on normal PCs the bus address is exactly the same as the physical -address, and things are very simple indeed. However, they are that simple -because the memory and the devices share the same address space, and that is -not generally necessarily true on other PCI/ISA setups. - -Now, just as an example, on the PReP (PowerPC Reference Platform), the -CPU sees a memory map something like this (this is from memory):: - - 0-2 GB "real memory" - 2 GB-3 GB "system IO" (inb/out and similar accesses on x86) - 3 GB-4 GB "IO memory" (shared memory over the IO bus) - -Now, that looks simple enough. However, when you look at the same thing from -the viewpoint of the devices, you have the reverse, and the physical memory -address 0 actually shows up as address 2 GB for any IO master. - -So when the CPU wants any bus master to write to physical memory 0, it -has to give the master address 0x80000000 as the memory address. - -So, for example, depending on how the kernel is actually mapped on the -PPC, you can end up with a setup like this:: - - physical address: 0 - virtual address: 0xC0000000 - bus address: 0x80000000 - -where all the addresses actually point to the same thing. It's just seen -through different translations.. - -Similarly, on the Alpha, the normal translation is:: - - physical address: 0 - virtual address: 0xfffffc0000000000 - bus address: 0x40000000 - -(but there are also Alphas where the physical address and the bus address -are the same). - -Anyway, the way to look up all these translations, you do:: - - #include <asm/io.h> - - phys_addr = virt_to_phys(virt_addr); - virt_addr = phys_to_virt(phys_addr); - bus_addr = virt_to_bus(virt_addr); - virt_addr = bus_to_virt(bus_addr); - -Now, when do you need these? - -You want the **virtual** address when you are actually going to access that -pointer from the kernel. So you can have something like this:: - - /* - * this is the hardware "mailbox" we use to communicate with - * the controller. The controller sees this directly. - */ - struct mailbox { - __u32 status; - __u32 bufstart; - __u32 buflen; - .. - } mbox; - - unsigned char * retbuffer; - - /* get the address from the controller */ - retbuffer = bus_to_virt(mbox.bufstart); - switch (retbuffer[0]) { - case STATUS_OK: - ... - -on the other hand, you want the bus address when you have a buffer that -you want to give to the controller:: - - /* ask the controller to read the sense status into "sense_buffer" */ - mbox.bufstart = virt_to_bus(&sense_buffer); - mbox.buflen = sizeof(sense_buffer); - mbox.status = 0; - notify_controller(&mbox); - -And you generally **never** want to use the physical address, because you can't -use that from the CPU (the CPU only uses translated virtual addresses), and -you can't use it from the bus master. - -So why do we care about the physical address at all? We do need the physical -address in some cases, it's just not very often in normal code. The physical -address is needed if you use memory mappings, for example, because the -"remap_pfn_range()" mm function wants the physical address of the memory to -be remapped as measured in units of pages, a.k.a. the pfn (the memory -management layer doesn't know about devices outside the CPU, so it -shouldn't need to know about "bus addresses" etc). - -.. note:: - - The above is only one part of the whole equation. The above - only talks about "real memory", that is, CPU memory (RAM). - -There is a completely different type of memory too, and that's the "shared -memory" on the PCI or ISA bus. That's generally not RAM (although in the case -of a video graphics card it can be normal DRAM that is just used for a frame -buffer), but can be things like a packet buffer in a network card etc. - -This memory is called "PCI memory" or "shared memory" or "IO memory" or -whatever, and there is only one way to access it: the readb/writeb and -related functions. You should never take the address of such memory, because -there is really nothing you can do with such an address: it's not -conceptually in the same memory space as "real memory" at all, so you cannot -just dereference a pointer. (Sadly, on x86 it **is** in the same memory space, -so on x86 it actually works to just deference a pointer, but it's not -portable). - -For such memory, you can do things like: - - - reading:: - - /* - * read first 32 bits from ISA memory at 0xC0000, aka - * C000:0000 in DOS terms - */ - unsigned int signature = isa_readl(0xC0000); - - - remapping and writing:: - - /* - * remap framebuffer PCI memory area at 0xFC000000, - * size 1MB, so that we can access it: We can directly - * access only the 640k-1MB area, so anything else - * has to be remapped. - */ - void __iomem *baseptr = ioremap(0xFC000000, 1024*1024); - - /* write a 'A' to the offset 10 of the area */ - writeb('A',baseptr+10); - - /* unmap when we unload the driver */ - iounmap(baseptr); - - - copying and clearing:: - - /* get the 6-byte Ethernet address at ISA address E000:0040 */ - memcpy_fromio(kernel_buffer, 0xE0040, 6); - /* write a packet to the driver */ - memcpy_toio(0xE1000, skb->data, skb->len); - /* clear the frame buffer */ - memset_io(0xA0000, 0, 0x10000); - -OK, that just about covers the basics of accessing IO portably. Questions? -Comments? You may think that all the above is overly complex, but one day you -might find yourself with a 500 MHz Alpha in front of you, and then you'll be -happy that your driver works ;) - -Note that kernel versions 2.0.x (and earlier) mistakenly called the -ioremap() function "vremap()". ioremap() is the proper name, but I -didn't think straight when I wrote it originally. People who have to -support both can do something like:: - - /* support old naming silliness */ - #if LINUX_VERSION_CODE < 0x020100 - #define ioremap vremap - #define iounmap vfree - #endif - -at the top of their source files, and then they can use the right names -even on 2.0.x systems. - -And the above sounds worse than it really is. Most real drivers really -don't do all that complex things (or rather: the complexity is not so -much in the actual IO accesses as in error handling and timeouts etc). -It's generally not hard to fix drivers, and in many cases the code -actually looks better afterwards:: - - unsigned long signature = *(unsigned int *) 0xC0000; - vs - unsigned long signature = readl(0xC0000); - -I think the second version actually is more readable, no? diff --git a/Documentation/core-api/dma-api-howto.rst b/Documentation/core-api/dma-api-howto.rst index 358d495456d1..828846804e25 100644 --- a/Documentation/core-api/dma-api-howto.rst +++ b/Documentation/core-api/dma-api-howto.rst @@ -707,20 +707,6 @@ to use the dma_sync_*() interfaces:: } } -Drivers converted fully to this interface should not use virt_to_bus() any -longer, nor should they use bus_to_virt(). Some drivers have to be changed a -little bit, because there is no longer an equivalent to bus_to_virt() in the -dynamic DMA mapping scheme - you have to always store the DMA addresses -returned by the dma_alloc_coherent(), dma_pool_alloc(), and dma_map_single() -calls (dma_map_sg() stores them in the scatterlist itself if the platform -supports dynamic DMA mapping in hardware) in your driver structures and/or -in the card registers. - -All drivers should be using these interfaces with no exceptions. It -is planned to completely remove virt_to_bus() and bus_to_virt() as -they are entirely deprecated. Some ports already do not provide these -as it is impossible to correctly support them. - Handling Errors =============== diff --git a/Documentation/core-api/index.rst b/Documentation/core-api/index.rst index dedd4d853329..726065a3095e 100644 --- a/Documentation/core-api/index.rst +++ b/Documentation/core-api/index.rst @@ -41,7 +41,6 @@ Library functionality that is used throughout the kernel. rbtree generic-radix-tree packing - bus-virt-phys-mapping this_cpu_ops timekeeping errseq diff --git a/Documentation/translations/zh_CN/core-api/index.rst b/Documentation/translations/zh_CN/core-api/index.rst index 7ca44629860c..10bc438504ac 100644 --- a/Documentation/translations/zh_CN/core-api/index.rst +++ b/Documentation/translations/zh_CN/core-api/index.rst @@ -53,7 +53,6 @@ Todolist: circular-buffers generic-radix-tree packing - bus-virt-phys-mapping this_cpu_ops timekeeping errseq diff --git a/arch/Kconfig b/arch/Kconfig index 761d169ba7fd..f330410da63a 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1406,6 +1406,9 @@ config ARCH_HAS_ELFCORE_COMPAT config ARCH_HAS_PARANOID_L1D_FLUSH bool +config ARCH_HAVE_TRACE_MMIO_ACCESS + bool + config DYNAMIC_SIGFRAME bool diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 7d0d26b5b3f5..97fce7386b00 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -17,7 +17,6 @@ config ALPHA select HAVE_PERF_EVENTS select NEED_DMA_MAP_STATE select NEED_SG_DMA_LENGTH - select VIRT_TO_BUS select GENERIC_IRQ_PROBE select GENERIC_PCI_IOMAP select AUTO_IRQ_AFFINITY if SMP diff --git a/arch/alpha/include/asm/floppy.h b/arch/alpha/include/asm/floppy.h index 588758685439..64b42d9591fc 100644 --- a/arch/alpha/include/asm/floppy.h +++ b/arch/alpha/include/asm/floppy.h @@ -20,7 +20,7 @@ #define fd_free_dma() free_dma(FLOPPY_DMA) #define fd_clear_dma_ff() clear_dma_ff(FLOPPY_DMA) #define fd_set_dma_mode(mode) set_dma_mode(FLOPPY_DMA,mode) -#define fd_set_dma_addr(addr) set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)) +#define fd_set_dma_addr(addr) set_dma_addr(FLOPPY_DMA,isa_virt_to_bus(addr)) #define fd_set_dma_count(count) set_dma_count(FLOPPY_DMA,count) #define fd_enable_irq() enable_irq(FLOPPY_IRQ) #define fd_disable_irq() disable_irq(FLOPPY_IRQ) diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h index c9cb554fbe54..d277189b2677 100644 --- a/arch/alpha/include/asm/io.h +++ b/arch/alpha/include/asm/io.h @@ -106,15 +106,15 @@ static inline void * phys_to_virt(unsigned long address) extern unsigned long __direct_map_base; extern unsigned long __direct_map_size; -static inline unsigned long __deprecated virt_to_bus(volatile void *address) +static inline unsigned long __deprecated isa_virt_to_bus(volatile void *address) { unsigned long phys = virt_to_phys(address); unsigned long bus = phys + __direct_map_base; return phys <= __direct_map_size ? bus : 0; } -#define isa_virt_to_bus virt_to_bus +#define isa_virt_to_bus isa_virt_to_bus -static inline void * __deprecated bus_to_virt(unsigned long address) +static inline void * __deprecated isa_bus_to_virt(unsigned long address) { void *virt; @@ -125,7 +125,7 @@ static inline void * __deprecated bus_to_virt(unsigned long address) virt = phys_to_virt(address); return (long)address <= 0 ? NULL : virt; } -#define isa_bus_to_virt bus_to_virt +#define isa_bus_to_virt isa_bus_to_virt /* * There are different chipsets to interface the Alpha CPUs to the world. diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c index 5c6f8d11a3ce..034cb48c9eeb 100644 --- a/arch/arm/kernel/irq.c +++ b/arch/arm/kernel/irq.c @@ -70,6 +70,7 @@ static void __init init_irq_stacks(void) } } +#ifndef CONFIG_PREEMPT_RT static void ____do_softirq(void *arg) { __do_softirq(); @@ -80,7 +81,7 @@ void do_softirq_own_stack(void) call_with_stack(____do_softirq, NULL, __this_cpu_read(irq_stack_ptr)); } - +#endif #endif int arch_show_interrupts(struct seq_file *p, int prec) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index e05fc9743767..6bb50124a7e9 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -49,6 +49,7 @@ config ARM64 select ARCH_HAS_ZONE_DMA_SET if EXPERT select ARCH_HAVE_ELF_PROT select ARCH_HAVE_NMI_SAFE_CMPXCHG + select ARCH_HAVE_TRACE_MMIO_ACCESS select ARCH_INLINE_READ_LOCK if !PREEMPTION select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 87dd42d74afe..877495a0fd0c 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -91,7 +91,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr) } /* IO barriers */ -#define __iormb(v) \ +#define __io_ar(v) \ ({ \ unsigned long tmp; \ \ @@ -108,39 +108,14 @@ static inline u64 __raw_readq(const volatile void __iomem *addr) : "memory"); \ }) -#define __io_par(v) __iormb(v) -#define __iowmb() dma_wmb() -#define __iomb() dma_mb() - -/* - * Relaxed I/O memory access primitives. These follow the Device memory - * ordering rules but do not guarantee any ordering relative to Normal memory - * accesses. - */ -#define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; }) -#define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; }) -#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; }) -#define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; }) +#define __io_bw() dma_wmb() +#define __io_br(v) +#define __io_aw(v) -#define writeb_relaxed(v,c) ((void)__raw_writeb((v),(c))) -#define writew_relaxed(v,c) ((void)__raw_writew((__force u16)cpu_to_le16(v),(c))) -#define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c))) -#define writeq_relaxed(v,c) ((void)__raw_writeq((__force u64)cpu_to_le64(v),(c))) - -/* - * I/O memory access primitives. Reads are ordered relative to any - * following Normal memory access. Writes are ordered relative to any prior - * Normal memory access. - */ -#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(__v); __v; }) -#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(__v); __v; }) -#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(__v); __v; }) -#define readq(c) ({ u64 __v = readq_relaxed(c); __iormb(__v); __v; }) - -#define writeb(v,c) ({ __iowmb(); writeb_relaxed((v),(c)); }) -#define writew(v,c) ({ __iowmb(); writew_relaxed((v),(c)); }) -#define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c)); }) -#define writeq(v,c) ({ __iowmb(); writeq_relaxed((v),(c)); }) +/* arm64-specific, don't use in portable drivers */ +#define __iormb(v) __io_ar(v) +#define __iowmb() __io_bw() +#define __iomb() dma_mb() /* * I/O port access primitives. diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index ed5d222e2826..b5c5119c7396 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -4,7 +4,12 @@ # asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS + +# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as +# there is no way to execute them and any such MMIO access from nVHE KVM +# will explode instantly (Words of Marc Zyngier). So introduce a generic flag +# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM. +ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__ hostprogs := gen-hyprel HOST_EXTRACFLAGS += -I$(objtree)/include diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index cb93769a9f2a..26ac8ea15a9e 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -39,7 +39,6 @@ config IA64 select HAVE_FUNCTION_DESCRIPTORS select HAVE_VIRT_CPU_ACCOUNTING select HUGETLB_PAGE_SIZE_VARIABLE if HUGETLB_PAGE - select VIRT_TO_BUS select GENERIC_IRQ_PROBE select GENERIC_PENDING_IRQ if SMP select GENERIC_IRQ_SHOW diff --git a/arch/ia64/include/asm/io.h b/arch/ia64/include/asm/io.h index 6d93b923b379..ce66dfc0e719 100644 --- a/arch/ia64/include/asm/io.h +++ b/arch/ia64/include/asm/io.h @@ -96,14 +96,6 @@ extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size); extern int valid_phys_addr_range (phys_addr_t addr, size_t count); /* efi.c */ extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count); -/* - * The following two macros are deprecated and scheduled for removal. - * Please use the PCI-DMA interface defined in <asm/pci.h> instead. - */ -#define bus_to_virt phys_to_virt -#define virt_to_bus virt_to_phys -#define page_to_bus page_to_phys - # endif /* KERNEL */ /* diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 936cce42ae9a..b06faf6c0b27 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -30,7 +30,6 @@ config M68K select OLD_SIGACTION select OLD_SIGSUSPEND3 select UACCESS_MEMCPY if !MMU - select VIRT_TO_BUS select ZONE_DMA config CPU_BIG_ENDIAN diff --git a/arch/m68k/include/asm/virtconvert.h b/arch/m68k/include/asm/virtconvert.h index ca91b32dc6ef..0a27905b0036 100644 --- a/arch/m68k/include/asm/virtconvert.h +++ b/arch/m68k/include/asm/virtconvert.h @@ -33,9 +33,11 @@ static inline void *phys_to_virt(unsigned long address) /* * IO bus memory addresses are 1:1 with the physical address, + * deprecated globally but still used on two machines. */ +#if defined(CONFIG_AMIGA) || defined(CONFIG_VME) #define virt_to_bus virt_to_phys -#define bus_to_virt phys_to_virt +#endif #endif #endif diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index ed9ce6117263..996132a5ef35 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -38,7 +38,6 @@ config MICROBLAZE select OF_EARLY_FLATTREE select PCI_DOMAINS_GENERIC if PCI select PCI_SYSCALL if PCI - select VIRT_TO_BUS select CPU_NO_EFFICIENT_FFS select MMU_GATHER_NO_RANGE select SPARSE_IRQ diff --git a/arch/microblaze/include/asm/io.h b/arch/microblaze/include/asm/io.h index b6a57f8468f0..c1d78b8977a6 100644 --- a/arch/microblaze/include/asm/io.h +++ b/arch/microblaze/include/asm/io.h @@ -30,8 +30,6 @@ extern resource_size_t isa_mem_base; #define PCI_IOBASE ((void __iomem *)_IO_BASE) #define IO_SPACE_LIMIT (0xFFFFFFFF) -#define page_to_bus(page) (page_to_phys(page)) - extern void iounmap(volatile void __iomem *addr); extern void __iomem *ioremap(phys_addr_t address, unsigned long size); diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 9457894db237..69f3b9b4677b 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -100,7 +100,6 @@ config MIPS select RTC_LIB select SYSCTL_EXCEPTION_TRACE select TRACE_IRQFLAGS_SUPPORT - select VIRT_TO_BUS select ARCH_HAS_ELFCORE_COMPAT select HAVE_ARCH_KCSAN if 64BIT diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h index 6f5c86d2bab4..cd9168f34fb7 100644 --- a/arch/mips/include/asm/io.h +++ b/arch/mips/include/asm/io.h @@ -148,15 +148,6 @@ static inline void *isa_bus_to_virt(unsigned long address) } /* - * However PCI ones are not necessarily 1:1 and therefore these interfaces - * are forbidden in portable PCI drivers. - * - * Allow them for x86 for legacy drivers, though. - */ -#define virt_to_bus virt_to_phys -#define bus_to_virt phys_to_virt - -/* * Change "struct page" to physical address. */ #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT) diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index fa400055b2d5..7f059cd1196a 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -44,7 +44,6 @@ config PARISC select SYSCTL_ARCH_UNALIGN_ALLOW select SYSCTL_EXCEPTION_TRACE select HAVE_MOD_ARCH_SPECIFIC - select VIRT_TO_BUS select MODULES_USE_ELF_RELA select CLONE_BACKWARDS select TTY # Needed for pdc_cons.c diff --git a/arch/parisc/include/asm/floppy.h b/arch/parisc/include/asm/floppy.h index 762cfe7778c0..b318a7df52f6 100644 --- a/arch/parisc/include/asm/floppy.h +++ b/arch/parisc/include/asm/floppy.h @@ -179,7 +179,7 @@ static void _fd_chose_dma_mode(char *addr, unsigned long size) { if(can_use_virtual_dma == 2) { if((unsigned int) addr >= (unsigned int) high_memory || - virt_to_bus(addr) >= 0x1000000 || + virt_to_phys(addr) >= 0x1000000 || _CROSS_64KB(addr, size, 0)) use_virtual_dma = 1; else @@ -215,7 +215,7 @@ static int hard_dma_setup(char *addr, unsigned long size, int mode, int io) doing_pdma = 0; clear_dma_ff(FLOPPY_DMA); set_dma_mode(FLOPPY_DMA,mode); - set_dma_addr(FLOPPY_DMA,virt_to_bus(addr)); + set_dma_addr(FLOPPY_DMA,virt_to_phys(addr)); set_dma_count(FLOPPY_DMA,size); enable_dma(FLOPPY_DMA); return 0; diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h index 837ddddbac6a..42ffb60a6ea9 100644 --- a/arch/parisc/include/asm/io.h +++ b/arch/parisc/include/asm/io.h @@ -7,8 +7,6 @@ #define virt_to_phys(a) ((unsigned long)__pa(a)) #define phys_to_virt(a) __va(a) -#define virt_to_bus virt_to_phys -#define bus_to_virt phys_to_virt static inline unsigned long isa_bus_to_virt(unsigned long addr) { BUG(); diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c index 5ebb1771b4ab..fbb882cb8dbb 100644 --- a/arch/parisc/kernel/irq.c +++ b/arch/parisc/kernel/irq.c @@ -480,10 +480,12 @@ static void execute_on_irq_stack(void *func, unsigned long param1) *irq_stack_in_use = 1; } +#ifndef CONFIG_PREEMPT_RT void do_softirq_own_stack(void) { execute_on_irq_stack(__do_softirq, 0); } +#endif #endif /* CONFIG_IRQSTACKS */ /* ONLY called from entry.S:intr_extint() */ diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index a4f8a5276e5c..88a738117312 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -277,7 +277,6 @@ config PPC select SYSCTL_EXCEPTION_TRACE select THREAD_INFO_IN_TASK select TRACE_IRQFLAGS_SUPPORT - select VIRT_TO_BUS if !PPC64 # # Please keep this list sorted alphabetically. # diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h index c5a5f7c9b231..73fcd5cdb662 100644 --- a/arch/powerpc/include/asm/io.h +++ b/arch/powerpc/include/asm/io.h @@ -985,8 +985,6 @@ static inline void * bus_to_virt(unsigned long address) } #define bus_to_virt bus_to_virt -#define page_to_bus(page) (page_to_phys(page) + PCI_DRAM_OFFSET) - #endif /* CONFIG_PPC32 */ /* access ports */ diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index dd09919c3c66..0822a274a549 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -611,6 +611,7 @@ static inline void check_stack_overflow(void) } } +#ifndef CONFIG_PREEMPT_RT static __always_inline void call_do_softirq(const void *sp) { /* Temporarily switch r1 to sp, call __do_softirq() then restore r1. */ @@ -629,6 +630,7 @@ static __always_inline void call_do_softirq(const void *sp) "r11", "r12" ); } +#endif static __always_inline void call_do_irq(struct pt_regs *regs, void *sp) { @@ -747,10 +749,12 @@ void *mcheckirq_ctx[NR_CPUS] __read_mostly; void *softirq_ctx[NR_CPUS] __read_mostly; void *hardirq_ctx[NR_CPUS] __read_mostly; +#ifndef CONFIG_PREEMPT_RT void do_softirq_own_stack(void) { call_do_softirq(softirq_ctx[smp_processor_id()]); } +#endif irq_hw_number_t virq_to_hw(unsigned int virq) { diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h index 1526e410e802..ac70b0fd9a9a 100644 --- a/arch/riscv/include/asm/page.h +++ b/arch/riscv/include/asm/page.h @@ -167,7 +167,6 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x); #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) -#define page_to_bus(page) (page_to_phys(page)) #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) diff --git a/arch/s390/include/asm/softirq_stack.h b/arch/s390/include/asm/softirq_stack.h index fd17f25704bd..af68d6c1d584 100644 --- a/arch/s390/include/asm/softirq_stack.h +++ b/arch/s390/include/asm/softirq_stack.h @@ -5,9 +5,10 @@ #include <asm/lowcore.h> #include <asm/stacktrace.h> +#ifndef CONFIG_PREEMPT_RT static inline void do_softirq_own_stack(void) { call_on_stack(0, S390_lowcore.async_stack, void, __do_softirq); } - +#endif #endif /* __ASM_S390_SOFTIRQ_STACK_H */ diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c index 56269c2c3414..909276738078 100644 --- a/arch/sh/kernel/irq.c +++ b/arch/sh/kernel/irq.c @@ -149,6 +149,7 @@ void irq_ctx_exit(int cpu) hardirq_ctx[cpu] = NULL; } +#ifndef CONFIG_PREEMPT_RT void do_softirq_own_stack(void) { struct thread_info *curctx; @@ -176,6 +177,7 @@ void do_softirq_own_stack(void) "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr" ); } +#endif #else static inline void handle_one_irq(unsigned int irq) { diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c index c8848bb681a1..41fa1be980a3 100644 --- a/arch/sparc/kernel/irq_64.c +++ b/arch/sparc/kernel/irq_64.c @@ -855,6 +855,7 @@ void __irq_entry handler_irq(int pil, struct pt_regs *regs) set_irq_regs(old_regs); } +#ifndef CONFIG_PREEMPT_RT void do_softirq_own_stack(void) { void *orig_sp, *sp = softirq_stack[smp_processor_id()]; @@ -869,6 +870,7 @@ void do_softirq_own_stack(void) __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); } +#endif #ifdef CONFIG_HOTPLUG_CPU void fixup_irqs(void) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index fb5900e2c29a..cca4c0ac39cc 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -280,7 +280,6 @@ config X86 select TRACE_IRQFLAGS_SUPPORT select TRACE_IRQFLAGS_NMI_SUPPORT select USER_STACKTRACE_SUPPORT - select VIRT_TO_BUS select HAVE_ARCH_KCSAN if X86_64 select X86_FEATURE_NAMES if PROC_FS select PROC_PID_ARCH_STATUS if PROC_FS diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h index 1870b99c3356..e9025640f634 100644 --- a/arch/x86/include/asm/io.h +++ b/arch/x86/include/asm/io.h @@ -170,15 +170,6 @@ static inline unsigned int isa_virt_to_bus(volatile void *address) #define isa_bus_to_virt phys_to_virt /* - * However PCI ones are not necessarily 1:1 and therefore these interfaces - * are forbidden in portable PCI drivers. - * - * Allow them on x86 for legacy drivers, though. - */ -#define virt_to_bus virt_to_phys -#define bus_to_virt phys_to_virt - -/* * The default ioremap() behavior is non-cached; if you need something * else, you probably want one of the following. */ diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 14e547ca2af8..12ac277282ba 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -52,7 +52,6 @@ config XTENSA select MODULES_USE_ELF_RELA select PERF_USE_VMALLOC select TRACE_IRQFLAGS_SUPPORT - select VIRT_TO_BUS help Xtensa processors are 32-bit RISC machines designed by Tensilica primarily for embedded systems. These processors are both diff --git a/arch/xtensa/include/asm/io.h b/arch/xtensa/include/asm/io.h index 54188e69b988..a5b707e1c0f4 100644 --- a/arch/xtensa/include/asm/io.h +++ b/arch/xtensa/include/asm/io.h @@ -63,9 +63,6 @@ static inline void iounmap(volatile void __iomem *addr) xtensa_iounmap(addr); } -#define virt_to_bus virt_to_phys -#define bus_to_virt phys_to_virt - #endif /* CONFIG_MMU */ #include <asm-generic/io.h> diff --git a/drivers/gpu/drm/meson/meson_viu.c b/drivers/gpu/drm/meson/meson_viu.c index 259f3e6bec90..bb7e109534de 100644 --- a/drivers/gpu/drm/meson/meson_viu.c +++ b/drivers/gpu/drm/meson/meson_viu.c @@ -469,17 +469,17 @@ void meson_viu_init(struct meson_drm *priv) priv->io_base + _REG(VD2_IF0_LUMA_FIFO_SIZE)); if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) { - writel_relaxed(VIU_OSD_BLEND_REORDER(0, 1) | - VIU_OSD_BLEND_REORDER(1, 0) | - VIU_OSD_BLEND_REORDER(2, 0) | - VIU_OSD_BLEND_REORDER(3, 0) | - VIU_OSD_BLEND_DIN_EN(1) | - VIU_OSD_BLEND1_DIN3_BYPASS_TO_DOUT1 | - VIU_OSD_BLEND1_DOUT_BYPASS_TO_BLEND2 | - VIU_OSD_BLEND_DIN0_BYPASS_TO_DOUT0 | - VIU_OSD_BLEND_BLEN2_PREMULT_EN(1) | - VIU_OSD_BLEND_HOLD_LINES(4), - priv->io_base + _REG(VIU_OSD_BLEND_CTRL)); + u32 val = (u32)VIU_OSD_BLEND_REORDER(0, 1) | + (u32)VIU_OSD_BLEND_REORDER(1, 0) | + (u32)VIU_OSD_BLEND_REORDER(2, 0) | + (u32)VIU_OSD_BLEND_REORDER(3, 0) | + (u32)VIU_OSD_BLEND_DIN_EN(1) | + (u32)VIU_OSD_BLEND1_DIN3_BYPASS_TO_DOUT1 | + (u32)VIU_OSD_BLEND1_DOUT_BYPASS_TO_BLEND2 | + (u32)VIU_OSD_BLEND_DIN0_BYPASS_TO_DOUT0 | + (u32)VIU_OSD_BLEND_BLEN2_PREMULT_EN(1) | + (u32)VIU_OSD_BLEND_HOLD_LINES(4); + writel_relaxed(val, priv->io_base + _REG(VIU_OSD_BLEND_CTRL)); writel_relaxed(OSD_BLEND_PATH_SEL_ENABLE, priv->io_base + _REG(OSD1_BLEND_SRC_CTRL)); diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index cf249ecad5a5..d39660a3e50c 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -98,7 +98,7 @@ u64 etm4x_sysreg_read(u32 offset, bool _relaxed, bool _64bit) } if (!_relaxed) - __iormb(res); /* Imitate the !relaxed I/O helpers */ + __io_ar(res); /* Imitate the !relaxed I/O helpers */ return res; } @@ -106,7 +106,7 @@ u64 etm4x_sysreg_read(u32 offset, bool _relaxed, bool _64bit) void etm4x_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit) { if (!_relaxed) - __iowmb(); /* Imitate the !relaxed I/O helpers */ + __io_bw(); /* Imitate the !relaxed I/O helpers */ if (!_64bit) val &= GENMASK(31, 0); @@ -130,7 +130,7 @@ static u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit) } if (!_relaxed) - __iormb(res); /* Imitate the !relaxed I/O helpers */ + __io_ar(res); /* Imitate the !relaxed I/O helpers */ return res; } @@ -138,7 +138,7 @@ static u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit) static void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit) { if (!_relaxed) - __iowmb(); /* Imitate the !relaxed I/O helpers */ + __io_bw(); /* Imitate the !relaxed I/O helpers */ if (!_64bit) val &= GENMASK(31, 0); diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index a7bfea31f7d8..4b21bb79f168 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -547,14 +547,14 @@ #define etm4x_read32(csa, offset) \ ({ \ u32 __val = etm4x_relaxed_read32((csa), (offset)); \ - __iormb(__val); \ + __io_ar(__val); \ __val; \ }) #define etm4x_read64(csa, offset) \ ({ \ u64 __val = etm4x_relaxed_read64((csa), (offset)); \ - __iormb(__val); \ + __io_ar(__val); \ __val; \ }) @@ -578,13 +578,13 @@ #define etm4x_write32(csa, val, offset) \ do { \ - __iowmb(); \ + __io_bw(); \ etm4x_relaxed_write32((csa), (val), (offset)); \ } while (0) #define etm4x_write64(csa, val, offset) \ do { \ - __iowmb(); \ + __io_bw(); \ etm4x_relaxed_write64((csa), (val), (offset)); \ } while (0) diff --git a/drivers/irqchip/irq-tegra.c b/drivers/irqchip/irq-tegra.c index e1f771c72fc4..ad3e2c1b3c87 100644 --- a/drivers/irqchip/irq-tegra.c +++ b/drivers/irqchip/irq-tegra.c @@ -148,10 +148,10 @@ static int tegra_ictlr_suspend(void) lic->cop_iep[i] = readl_relaxed(ictlr + ICTLR_COP_IEP_CLASS); /* Disable COP interrupts */ - writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR); + writel_relaxed(GENMASK(31, 0), ictlr + ICTLR_COP_IER_CLR); /* Disable CPU interrupts */ - writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR); + writel_relaxed(GENMASK(31, 0), ictlr + ICTLR_CPU_IER_CLR); /* Enable the wakeup sources of ictlr */ writel_relaxed(lic->ictlr_wake_mask[i], ictlr + ICTLR_CPU_IER_SET); @@ -172,12 +172,12 @@ static void tegra_ictlr_resume(void) writel_relaxed(lic->cpu_iep[i], ictlr + ICTLR_CPU_IEP_CLASS); - writel_relaxed(~0ul, ictlr + ICTLR_CPU_IER_CLR); + writel_relaxed(GENMASK(31, 0), ictlr + ICTLR_CPU_IER_CLR); writel_relaxed(lic->cpu_ier[i], ictlr + ICTLR_CPU_IER_SET); writel_relaxed(lic->cop_iep[i], ictlr + ICTLR_COP_IEP_CLASS); - writel_relaxed(~0ul, ictlr + ICTLR_COP_IER_CLR); + writel_relaxed(GENMASK(31, 0), ictlr + ICTLR_COP_IER_CLR); writel_relaxed(lic->cop_ier[i], ictlr + ICTLR_COP_IER_SET); } @@ -312,7 +312,7 @@ static int __init tegra_ictlr_init(struct device_node *node, lic->base[i] = base; /* Disable all interrupts */ - writel_relaxed(~0UL, base + ICTLR_CPU_IER_CLR); + writel_relaxed(GENMASK(31, 0), base + ICTLR_CPU_IER_CLR); /* All interrupts target IRQ */ writel_relaxed(0, base + ICTLR_CPU_IEP_CLASS); diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c index 28a8c0dda66c..a0ceeede450f 100644 --- a/drivers/soc/qcom/qcom-geni-se.c +++ b/drivers/soc/qcom/qcom-geni-se.c @@ -1,6 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved. +/* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */ +#define __DISABLE_TRACE_MMIO__ + #include <linux/acpi.h> #include <linux/clk.h> #include <linux/slab.h> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index f8f950641ad9..6f50a0b3c364 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -1,6 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2017-2018, The Linux foundation. All rights reserved. +/* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */ +#define __DISABLE_TRACE_MMIO__ + #include <linux/clk.h> #include <linux/console.h> #include <linux/io.h> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h index 72974cb81343..a68f8fbf423b 100644 --- a/include/asm-generic/io.h +++ b/include/asm-generic/io.h @@ -10,6 +10,7 @@ #include <asm/page.h> /* I/O is all done through memory accesses */ #include <linux/string.h> /* for memset() and memcpy() */ #include <linux/types.h> +#include <linux/instruction_pointer.h> #ifdef CONFIG_GENERIC_IOMAP #include <asm-generic/iomap.h> @@ -61,6 +62,44 @@ #define __io_par(v) __io_ar(v) #endif +/* + * "__DISABLE_TRACE_MMIO__" flag can be used to disable MMIO tracing for + * specific kernel drivers in case of excessive/unwanted logging. + * + * Usage: Add a #define flag at the beginning of the driver file. + * Ex: #define __DISABLE_TRACE_MMIO__ + * #include <...> + * ... + */ +#if IS_ENABLED(CONFIG_TRACE_MMIO_ACCESS) && !(defined(__DISABLE_TRACE_MMIO__)) +#include <linux/tracepoint-defs.h> + +DECLARE_TRACEPOINT(rwmmio_write); +DECLARE_TRACEPOINT(rwmmio_post_write); +DECLARE_TRACEPOINT(rwmmio_read); +DECLARE_TRACEPOINT(rwmmio_post_read); + +void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr, + unsigned long caller_addr); +void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr, + unsigned long caller_addr); +void log_read_mmio(u8 width, const volatile void __iomem *addr, + unsigned long caller_addr); +void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr, + unsigned long caller_addr); + +#else + +static inline void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr, + unsigned long caller_addr) {} +static inline void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr, + unsigned long caller_addr) {} +static inline void log_read_mmio(u8 width, const volatile void __iomem *addr, + unsigned long caller_addr) {} +static inline void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr, + unsigned long caller_addr) {} + +#endif /* CONFIG_TRACE_MMIO_ACCESS */ /* * __raw_{read,write}{b,w,l,q}() access memory in native endianness. @@ -149,9 +188,11 @@ static inline u8 readb(const volatile void __iomem *addr) { u8 val; + log_read_mmio(8, addr, _THIS_IP_); __io_br(); val = __raw_readb(addr); __io_ar(val); + log_post_read_mmio(val, 8, addr, _THIS_IP_); return val; } #endif @@ -162,9 +203,11 @@ static inline u16 readw(const volatile void __iomem *addr) { u16 val; + log_read_mmio(16, addr, _THIS_IP_); __io_br(); val = __le16_to_cpu((__le16 __force)__raw_readw(addr)); __io_ar(val); + log_post_read_mmio(val, 16, addr, _THIS_IP_); return val; } #endif @@ -175,9 +218,11 @@ static inline u32 readl(const volatile void __iomem *addr) { u32 val; + log_read_mmio(32, addr, _THIS_IP_); __io_br(); val = __le32_to_cpu((__le32 __force)__raw_readl(addr)); __io_ar(val); + log_post_read_mmio(val, 32, addr, _THIS_IP_); return val; } #endif @@ -189,9 +234,11 @@ static inline u64 readq(const volatile void __iomem *addr) { u64 val; + log_read_mmio(64, addr, _THIS_IP_); __io_br(); val = __le64_to_cpu(__raw_readq(addr)); __io_ar(val); + log_post_read_mmio(val, 64, addr, _THIS_IP_); return val; } #endif @@ -201,9 +248,11 @@ static inline u64 readq(const volatile void __iomem *addr) #define writeb writeb static inline void writeb(u8 value, volatile void __iomem *addr) { + log_write_mmio(value, 8, addr, _THIS_IP_); __io_bw(); __raw_writeb(value, addr); __io_aw(); + log_post_write_mmio(value, 8, addr, _THIS_IP_); } #endif @@ -211,9 +260,11 @@ static inline void writeb(u8 value, volatile void __iomem *addr) #define writew writew static inline void writew(u16 value, volatile void __iomem *addr) { + log_write_mmio(value, 16, addr, _THIS_IP_); __io_bw(); __raw_writew((u16 __force)cpu_to_le16(value), addr); __io_aw(); + log_post_write_mmio(value, 16, addr, _THIS_IP_); } #endif @@ -221,9 +272,11 @@ static inline void writew(u16 value, volatile void __iomem *addr) #define writel writel static inline void writel(u32 value, volatile void __iomem *addr) { + log_write_mmio(value, 32, addr, _THIS_IP_); __io_bw(); __raw_writel((u32 __force)__cpu_to_le32(value), addr); __io_aw(); + log_post_write_mmio(value, 32, addr, _THIS_IP_); } #endif @@ -232,9 +285,11 @@ static inline void writel(u32 value, volatile void __iomem *addr) #define writeq writeq static inline void writeq(u64 value, volatile void __iomem *addr) { + log_write_mmio(value, 64, addr, _THIS_IP_); __io_bw(); __raw_writeq(__cpu_to_le64(value), addr); __io_aw(); + log_post_write_mmio(value, 64, addr, _THIS_IP_); } #endif #endif /* CONFIG_64BIT */ @@ -248,7 +303,12 @@ static inline void writeq(u64 value, volatile void __iomem *addr) #define readb_relaxed readb_relaxed static inline u8 readb_relaxed(const volatile void __iomem *addr) { - return __raw_readb(addr); + u8 val; + + log_read_mmio(8, addr, _THIS_IP_); + val = __raw_readb(addr); + log_post_read_mmio(val, 8, addr, _THIS_IP_); + return val; } #endif @@ -256,7 +316,12 @@ static inline u8 readb_relaxed(const volatile void __iomem *addr) #define readw_relaxed readw_relaxed static inline u16 readw_relaxed(const volatile void __iomem *addr) { - return __le16_to_cpu(__raw_readw(addr)); + u16 val; + + log_read_mmio(16, addr, _THIS_IP_); + val = __le16_to_cpu(__raw_readw(addr)); + log_post_read_mmio(val, 16, addr, _THIS_IP_); + return val; } #endif @@ -264,7 +329,12 @@ static inline u16 readw_relaxed(const volatile void __iomem *addr) #define readl_relaxed readl_relaxed static inline u32 readl_relaxed(const volatile void __iomem *addr) { - return __le32_to_cpu(__raw_readl(addr)); + u32 val; + + log_read_mmio(32, addr, _THIS_IP_); + val = __le32_to_cpu(__raw_readl(addr)); + log_post_read_mmio(val, 32, addr, _THIS_IP_); + return val; } #endif @@ -272,7 +342,12 @@ static inline u32 readl_relaxed(const volatile void __iomem *addr) #define readq_relaxed readq_relaxed static inline u64 readq_relaxed(const volatile void __iomem *addr) { - return __le64_to_cpu(__raw_readq(addr)); + u64 val; + + log_read_mmio(64, addr, _THIS_IP_); + val = __le64_to_cpu(__raw_readq(addr)); + log_post_read_mmio(val, 64, addr, _THIS_IP_); + return val; } #endif @@ -280,7 +355,9 @@ static inline u64 readq_relaxed(const volatile void __iomem *addr) #define writeb_relaxed writeb_relaxed static inline void writeb_relaxed(u8 value, volatile void __iomem *addr) { + log_write_mmio(value, 8, addr, _THIS_IP_); __raw_writeb(value, addr); + log_post_write_mmio(value, 8, addr, _THIS_IP_); } #endif @@ -288,7 +365,9 @@ static inline void writeb_relaxed(u8 value, volatile void __iomem *addr) #define writew_relaxed writew_relaxed static inline void writew_relaxed(u16 value, volatile void __iomem *addr) { + log_write_mmio(value, 16, addr, _THIS_IP_); __raw_writew(cpu_to_le16(value), addr); + log_post_write_mmio(value, 16, addr, _THIS_IP_); } #endif @@ -296,7 +375,9 @@ static inline void writew_relaxed(u16 value, volatile void __iomem *addr) #define writel_relaxed writel_relaxed static inline void writel_relaxed(u32 value, volatile void __iomem *addr) { + log_write_mmio(value, 32, addr, _THIS_IP_); __raw_writel(__cpu_to_le32(value), addr); + log_post_write_mmio(value, 32, addr, _THIS_IP_); } #endif @@ -304,7 +385,9 @@ static inline void writel_relaxed(u32 value, volatile void __iomem *addr) #define writeq_relaxed writeq_relaxed static inline void writeq_relaxed(u64 value, volatile void __iomem *addr) { + log_write_mmio(value, 64, addr, _THIS_IP_); __raw_writeq(__cpu_to_le64(value), addr); + log_post_write_mmio(value, 64, addr, _THIS_IP_); } #endif @@ -1086,20 +1169,6 @@ static inline void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr) } #endif -#ifdef CONFIG_VIRT_TO_BUS -#ifndef virt_to_bus -static inline unsigned long virt_to_bus(void *address) -{ - return (unsigned long)address; -} - -static inline void *bus_to_virt(unsigned long address) -{ - return (void *)address; -} -#endif -#endif - #ifndef memset_io #define memset_io memset_io /** diff --git a/include/asm-generic/softirq_stack.h b/include/asm-generic/softirq_stack.h index eceeecf6a5bd..d3e2d81656e0 100644 --- a/include/asm-generic/softirq_stack.h +++ b/include/asm-generic/softirq_stack.h @@ -2,7 +2,7 @@ #ifndef __ASM_GENERIC_SOFTIRQ_STACK_H #define __ASM_GENERIC_SOFTIRQ_STACK_H -#ifdef CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK +#if defined(CONFIG_HAVE_SOFTIRQ_ON_OWN_STACK) && !defined(CONFIG_PREEMPT_RT) void do_softirq_own_stack(void); #else static inline void do_softirq_own_stack(void) diff --git a/include/trace/events/rwmmio.h b/include/trace/events/rwmmio.h new file mode 100644 index 000000000000..de41159216c1 --- /dev/null +++ b/include/trace/events/rwmmio.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM rwmmio + +#if !defined(_TRACE_RWMMIO_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_RWMMIO_H + +#include <linux/tracepoint.h> + +DECLARE_EVENT_CLASS(rwmmio_rw_template, + + TP_PROTO(unsigned long caller, u64 val, u8 width, volatile void __iomem *addr), + + TP_ARGS(caller, val, width, addr), + + TP_STRUCT__entry( + __field(unsigned long, caller) + __field(unsigned long, addr) + __field(u64, val) + __field(u8, width) + ), + + TP_fast_assign( + __entry->caller = caller; + __entry->val = val; + __entry->addr = (unsigned long)addr; + __entry->width = width; + ), + + TP_printk("%pS width=%d val=%#llx addr=%#lx", + (void *)__entry->caller, __entry->width, + __entry->val, __entry->addr) +); + +DEFINE_EVENT(rwmmio_rw_template, rwmmio_write, + TP_PROTO(unsigned long caller, u64 val, u8 width, volatile void __iomem *addr), + TP_ARGS(caller, val, width, addr) +); + +DEFINE_EVENT(rwmmio_rw_template, rwmmio_post_write, + TP_PROTO(unsigned long caller, u64 val, u8 width, volatile void __iomem *addr), + TP_ARGS(caller, val, width, addr) +); + +TRACE_EVENT(rwmmio_read, + + TP_PROTO(unsigned long caller, u8 width, const volatile void __iomem *addr), + + TP_ARGS(caller, width, addr), + + TP_STRUCT__entry( + __field(unsigned long, caller) + __field(unsigned long, addr) + __field(u8, width) + ), + + TP_fast_assign( + __entry->caller = caller; + __entry->addr = (unsigned long)addr; + __entry->width = width; + ), + + TP_printk("%pS width=%d addr=%#lx", + (void *)__entry->caller, __entry->width, __entry->addr) +); + +TRACE_EVENT(rwmmio_post_read, + + TP_PROTO(unsigned long caller, u64 val, u8 width, const volatile void __iomem *addr), + + TP_ARGS(caller, val, width, addr), + + TP_STRUCT__entry( + __field(unsigned long, caller) + __field(unsigned long, addr) + __field(u64, val) + __field(u8, width) + ), + + TP_fast_assign( + __entry->caller = caller; + __entry->val = val; + __entry->addr = (unsigned long)addr; + __entry->width = width; + ), + + TP_printk("%pS width=%d val=%#llx addr=%#lx", + (void *)__entry->caller, __entry->width, + __entry->val, __entry->addr) +); + +#endif /* _TRACE_RWMMIO_H */ + +#include <trace/define_trace.h> diff --git a/lib/Kconfig b/lib/Kconfig index eaaad4d85bf2..55c27e1ec9cb 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -118,6 +118,13 @@ config INDIRECT_IOMEM_FALLBACK mmio accesses when the IO memory address is not a registered emulated region. +config TRACE_MMIO_ACCESS + bool "Register read/write tracing" + depends on TRACING && ARCH_HAVE_TRACE_MMIO_ACCESS + help + Create tracepoints for MMIO read/write operations. These trace events + can be used for logging all MMIO read/write operations. + source "lib/crypto/Kconfig" config LIB_MEMNEQ diff --git a/lib/Makefile b/lib/Makefile index 441795bf5d33..0eb8114600c1 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -151,6 +151,8 @@ lib-y += logic_pio.o lib-$(CONFIG_INDIRECT_IOMEM) += logic_iomem.o +obj-$(CONFIG_TRACE_MMIO_ACCESS) += trace_readwrite.o + obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o obj-$(CONFIG_BTREE) += btree.o diff --git a/lib/trace_readwrite.c b/lib/trace_readwrite.c new file mode 100644 index 000000000000..88637038b30c --- /dev/null +++ b/lib/trace_readwrite.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Register read and write tracepoints + * + * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include <linux/ftrace.h> +#include <linux/module.h> +#include <asm-generic/io.h> + +#define CREATE_TRACE_POINTS +#include <trace/events/rwmmio.h> + +#ifdef CONFIG_TRACE_MMIO_ACCESS +void log_write_mmio(u64 val, u8 width, volatile void __iomem *addr, + unsigned long caller_addr) +{ + trace_rwmmio_write(caller_addr, val, width, addr); +} +EXPORT_SYMBOL_GPL(log_write_mmio); +EXPORT_TRACEPOINT_SYMBOL_GPL(rwmmio_write); + +void log_post_write_mmio(u64 val, u8 width, volatile void __iomem *addr, + unsigned long caller_addr) +{ + trace_rwmmio_post_write(caller_addr, val, width, addr); +} +EXPORT_SYMBOL_GPL(log_post_write_mmio); +EXPORT_TRACEPOINT_SYMBOL_GPL(rwmmio_post_write); + +void log_read_mmio(u8 width, const volatile void __iomem *addr, + unsigned long caller_addr) +{ + trace_rwmmio_read(caller_addr, width, addr); +} +EXPORT_SYMBOL_GPL(log_read_mmio); +EXPORT_TRACEPOINT_SYMBOL_GPL(rwmmio_read); + +void log_post_read_mmio(u64 val, u8 width, const volatile void __iomem *addr, + unsigned long caller_addr) +{ + trace_rwmmio_post_read(caller_addr, val, width, addr); +} +EXPORT_SYMBOL_GPL(log_post_read_mmio); +EXPORT_TRACEPOINT_SYMBOL_GPL(rwmmio_post_read); +#endif /* CONFIG_TRACE_MMIO_ACCESS */ diff --git a/mm/Kconfig b/mm/Kconfig index 169e64192e48..b7a44b17c79f 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -639,14 +639,6 @@ config BOUNCE memory available to the CPU. Enabled by default when HIGHMEM is selected, but you may say n to override this. -config VIRT_TO_BUS - bool - help - An architecture should select this if it implements the - deprecated interface virt_to_bus(). All new architectures - should probably not select this. - - config MMU_NOTIFIER bool select SRCU diff --git a/tools/include/uapi/asm-generic/fcntl.h b/tools/include/uapi/asm-generic/fcntl.h index 1ecdb911add8..b02c8e0f4057 100644 --- a/tools/include/uapi/asm-generic/fcntl.h +++ b/tools/include/uapi/asm-generic/fcntl.h @@ -143,7 +143,7 @@ * record locks, but are "owned" by the open file description, not the * process. This means that they are inherited across fork() like BSD (flock) * locks, and they are only released automatically when the last reference to - * the the open file against which they were acquired is put. + * the open file against which they were acquired is put. */ #define F_OFD_GETLK 36 #define F_OFD_SETLK 37 |