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powerpc fixes for 4.20 #3

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Two weeks worth of fixes since rc1.
 
  - I broke 16-byte alignment of the stack when we moved PPR into pt_regs.
    Despite being required by the ABI this broke almost nothing, we eventually
    hit it in code where GCC does arithmetic on the stack pointer assuming the
    bottom 4 bits are clear. Fix it by padding the in-kernel pt_regs by 8 bytes.
 
  - A couple of commits fixing minor bugs in the recent SLB rewrite.
 
  - A build fix related to tracepoints in KVM in some configurations.
 
  - Our old "IO workarounds" code written for Cell couldn't coexist in a kernel
    that runs on Power9 with the Radix MMU, fix that.
 
  - Remove the NPU DMA ops, these just printed a warning and should never have
    been called.
 
  - Suppress an overly chatty message triggered by CPU hotplug in some configs.
 
  - Two small selftest fixes.
 
 Thanks to:
   Alistair Popple, Gustavo Romero, Nicholas Piggin, Satheesh Rajendran, Scott Wood.
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Merge tag 'powerpc-4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Two weeks worth of fixes since rc1.

   - I broke 16-byte alignment of the stack when we moved PPR into
     pt_regs. Despite being required by the ABI this broke almost
     nothing, we eventually hit it in code where GCC does arithmetic on
     the stack pointer assuming the bottom 4 bits are clear. Fix it by
     padding the in-kernel pt_regs by 8 bytes.

   - A couple of commits fixing minor bugs in the recent SLB rewrite.

   - A build fix related to tracepoints in KVM in some configurations.

   - Our old "IO workarounds" code written for Cell couldn't coexist in
     a kernel that runs on Power9 with the Radix MMU, fix that.

   - Remove the NPU DMA ops, these just printed a warning and should
     never have been called.

   - Suppress an overly chatty message triggered by CPU hotplug in some
     configs.

   - Two small selftest fixes.

  Thanks to: Alistair Popple, Gustavo Romero, Nicholas Piggin, Satheesh
  Rajendran, Scott Wood"

* tag 'powerpc-4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  selftests/powerpc: Adjust wild_bctr to build with old binutils
  powerpc/64: Fix kernel stack 16-byte alignment
  powerpc/numa: Suppress "VPHN is not supported" messages
  selftests/powerpc: Fix wild_bctr test to work on ppc64
  powerpc/io: Fix the IO workarounds code to work with Radix
  powerpc/mm/64s: Fix preempt warning in slb_allocate_kernel()
  KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE
  powerpc/mm/64s: Only use slbfee on CPUs that support it
  powerpc/mm/64s: Use PPC_SLBFEE macro
  powerpc/mm/64s: Consolidate SLB assertions
  powerpc/powernv/npu: Remove NPU DMA ops
This commit is contained in:
Linus Torvalds 2018-11-16 10:14:54 -06:00
commit ef268de197
12 changed files with 76 additions and 106 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
arch/powerpc/include/asm/io.h
View File

@ -268,19 +268,13 @@ extern void _memcpy_toio(volatile void __iomem *dest, const void *src,
* their hooks, a bitfield is reserved for use by the platform near the
* top of MMIO addresses (not PIO, those have to cope the hard way).
*
* This bit field is 12 bits and is at the top of the IO virtual
* addresses PCI_IO_INDIRECT_TOKEN_MASK.
* The highest address in the kernel virtual space are:
*
* The kernel virtual space is thus:
* d0003fffffffffff # with Hash MMU
* c00fffffffffffff # with Radix MMU
*
* 0xD000000000000000 : vmalloc
* 0xD000080000000000 : PCI PHB IO space
* 0xD000080080000000 : ioremap
* 0xD0000fffffffffff : end of ioremap region
*
* Since the top 4 bits are reserved as the region ID, we use thus
* the next 12 bits and keep 4 bits available for the future if the
* virtual address space is ever to be extended.
* The top 4 bits are reserved as the region ID on hash, leaving us 8 bits
* that can be used for the field.
*
* The direct IO mapping operations will then mask off those bits
* before doing the actual access, though that only happen when
@ -292,8 +286,8 @@ extern void _memcpy_toio(volatile void __iomem *dest, const void *src,
*/
#ifdef CONFIG_PPC_INDIRECT_MMIO
#define PCI_IO_IND_TOKEN_MASK 0x0fff000000000000ul
#define PCI_IO_IND_TOKEN_SHIFT 48
#define PCI_IO_IND_TOKEN_SHIFT 52
#define PCI_IO_IND_TOKEN_MASK (0xfful << PCI_IO_IND_TOKEN_SHIFT)
#define PCI_FIX_ADDR(addr) \
((PCI_IO_ADDR)(((unsigned long)(addr)) & ~PCI_IO_IND_TOKEN_MASK))
#define PCI_GET_ADDR_TOKEN(addr) \

2
arch/powerpc/include/asm/ppc-opcode.h
View File

@ -493,6 +493,8 @@
__PPC_RS(t) | __PPC_RA0(a) | __PPC_RB(b))
#define PPC_SLBFEE_DOT(t, b) stringify_in_c(.long PPC_INST_SLBFEE | \
__PPC_RT(t) | __PPC_RB(b))
#define __PPC_SLBFEE_DOT(t, b) stringify_in_c(.long PPC_INST_SLBFEE | \
___PPC_RT(t) | ___PPC_RB(b))
#define PPC_ICBT(c,a,b) stringify_in_c(.long PPC_INST_ICBT | \
__PPC_CT(c) | __PPC_RA0(a) | __PPC_RB(b))
/* PASemi instructions */

1
arch/powerpc/include/asm/ptrace.h
View File

@ -54,6 +54,7 @@ struct pt_regs
#ifdef CONFIG_PPC64
unsigned long ppr;
unsigned long __pad; /* Maintain 16 byte interrupt stack alignment */
#endif
};
#endif

2
arch/powerpc/kernel/setup_64.c
View File

@ -636,6 +636,8 @@ static void *__init alloc_stack(unsigned long limit, int cpu)
{
unsigned long pa;
BUILD_BUG_ON(STACK_INT_FRAME_SIZE % 16);
pa = memblock_alloc_base_nid(THREAD_SIZE, THREAD_SIZE, limit,
early_cpu_to_node(cpu), MEMBLOCK_NONE);
if (!pa) {

8
arch/powerpc/kvm/trace.h
View File

@ -6,8 +6,6 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace
/*
* Tracepoint for guest mode entry.
@ -120,4 +118,10 @@ TRACE_EVENT(kvm_check_requests,
#endif /* _TRACE_KVM_H */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace
#include <trace/define_trace.h>

9
arch/powerpc/kvm/trace_booke.h
View File

@ -6,8 +6,6 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm_booke
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_booke
#define kvm_trace_symbol_exit \
{0, "CRITICAL"}, \
@ -218,4 +216,11 @@ TRACE_EVENT(kvm_booke_queue_irqprio,
#endif
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_booke
#include <trace/define_trace.h>

9
arch/powerpc/kvm/trace_hv.h
View File

@ -9,8 +9,6 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm_hv
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_hv
#define kvm_trace_symbol_hcall \
{H_REMOVE, "H_REMOVE"}, \
@ -497,4 +495,11 @@ TRACE_EVENT(kvmppc_run_vcpu_exit,
#endif /* _TRACE_KVM_HV_H */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_hv
#include <trace/define_trace.h>

9
arch/powerpc/kvm/trace_pr.h
View File

@ -8,8 +8,6 @@
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm_pr
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_pr
TRACE_EVENT(kvm_book3s_reenter,
TP_PROTO(int r, struct kvm_vcpu *vcpu),
@ -257,4 +255,11 @@ TRACE_EVENT(kvm_exit,
#endif /* _TRACE_KVM_H */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace_pr
#include <trace/define_trace.h>

2
arch/powerpc/mm/numa.c
View File

@ -1178,7 +1178,7 @@ static long vphn_get_associativity(unsigned long cpu,
switch (rc) {
case H_FUNCTION:
printk(KERN_INFO
printk_once(KERN_INFO
"VPHN is not supported. Disabling polling...\n");
stop_topology_update();
break;

35
arch/powerpc/mm/slb.c
View File

@ -19,6 +19,7 @@
#include <asm/mmu.h>
#include <asm/mmu_context.h>
#include <asm/paca.h>
#include <asm/ppc-opcode.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <asm/smp.h>
@ -58,27 +59,19 @@ static inline unsigned long mk_vsid_data(unsigned long ea, int ssize,
return __mk_vsid_data(get_kernel_vsid(ea, ssize), ssize, flags);
}
static void assert_slb_exists(unsigned long ea)
static void assert_slb_presence(bool present, unsigned long ea)
{
#ifdef CONFIG_DEBUG_VM
unsigned long tmp;
WARN_ON_ONCE(mfmsr() & MSR_EE);
asm volatile("slbfee. %0, %1" : "=r"(tmp) : "r"(ea) : "cr0");
WARN_ON(tmp == 0);
#endif
}
if (!cpu_has_feature(CPU_FTR_ARCH_206))
return;
static void assert_slb_notexists(unsigned long ea)
{
#ifdef CONFIG_DEBUG_VM
unsigned long tmp;
asm volatile(__PPC_SLBFEE_DOT(%0, %1) : "=r"(tmp) : "r"(ea) : "cr0");
WARN_ON_ONCE(mfmsr() & MSR_EE);
asm volatile("slbfee. %0, %1" : "=r"(tmp) : "r"(ea) : "cr0");
WARN_ON(tmp != 0);
WARN_ON(present == (tmp == 0));
#endif
}
@ -114,7 +107,7 @@ static inline void create_shadowed_slbe(unsigned long ea, int ssize,
*/
slb_shadow_update(ea, ssize, flags, index);
assert_slb_notexists(ea);
assert_slb_presence(false, ea);
asm volatile("slbmte %0,%1" :
: "r" (mk_vsid_data(ea, ssize, flags)),
"r" (mk_esid_data(ea, ssize, index))
@ -137,7 +130,7 @@ void __slb_restore_bolted_realmode(void)
"r" (be64_to_cpu(p->save_area[index].esid)));
}
assert_slb_exists(local_paca->kstack);
assert_slb_presence(true, local_paca->kstack);
}
/*
@ -185,7 +178,7 @@ void slb_flush_and_restore_bolted(void)
:: "r" (be64_to_cpu(p->save_area[KSTACK_INDEX].vsid)),
"r" (be64_to_cpu(p->save_area[KSTACK_INDEX].esid))
: "memory");
assert_slb_exists(get_paca()->kstack);
assert_slb_presence(true, get_paca()->kstack);
get_paca()->slb_cache_ptr = 0;
@ -443,9 +436,9 @@ void switch_slb(struct task_struct *tsk, struct mm_struct *mm)
ea = (unsigned long)
get_paca()->slb_cache[i] << SID_SHIFT;
/*
* Could assert_slb_exists here, but hypervisor
* or machine check could have come in and
* removed the entry at this point.
* Could assert_slb_presence(true) here, but
* hypervisor or machine check could have come
* in and removed the entry at this point.
*/
slbie_data = ea;
@ -676,7 +669,7 @@ static long slb_insert_entry(unsigned long ea, unsigned long context,
* User preloads should add isync afterwards in case the kernel
* accesses user memory before it returns to userspace with rfid.
*/
assert_slb_notexists(ea);
assert_slb_presence(false, ea);
asm volatile("slbmte %0, %1" : : "r" (vsid_data), "r" (esid_data));
barrier();
@ -715,7 +708,7 @@ static long slb_allocate_kernel(unsigned long ea, unsigned long id)
return -EFAULT;
if (ea < H_VMALLOC_END)
flags = get_paca()->vmalloc_sllp;
flags = local_paca->vmalloc_sllp;
else
flags = SLB_VSID_KERNEL | mmu_psize_defs[mmu_io_psize].sllp;
} else {

64
arch/powerpc/platforms/powernv/npu-dma.c
View File

@ -102,63 +102,6 @@ struct pci_dev *pnv_pci_get_npu_dev(struct pci_dev *gpdev, int index)
}
EXPORT_SYMBOL(pnv_pci_get_npu_dev);
#define NPU_DMA_OP_UNSUPPORTED() \
dev_err_once(dev, "%s operation unsupported for NVLink devices\n", \
__func__)
static void *dma_npu_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
unsigned long attrs)
{
NPU_DMA_OP_UNSUPPORTED();
return NULL;
}
static void dma_npu_free(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs)
{
NPU_DMA_OP_UNSUPPORTED();
}
static dma_addr_t dma_npu_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
unsigned long attrs)
{
NPU_DMA_OP_UNSUPPORTED();
return 0;
}
static int dma_npu_map_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction direction,
unsigned long attrs)
{
NPU_DMA_OP_UNSUPPORTED();
return 0;
}
static int dma_npu_dma_supported(struct device *dev, u64 mask)
{
NPU_DMA_OP_UNSUPPORTED();
return 0;
}
static u64 dma_npu_get_required_mask(struct device *dev)
{
NPU_DMA_OP_UNSUPPORTED();
return 0;
}
static const struct dma_map_ops dma_npu_ops = {
.map_page = dma_npu_map_page,
.map_sg = dma_npu_map_sg,
.alloc = dma_npu_alloc,
.free = dma_npu_free,
.dma_supported = dma_npu_dma_supported,
.get_required_mask = dma_npu_get_required_mask,
};
/*
* Returns the PE assoicated with the PCI device of the given
* NPU. Returns the linked pci device if pci_dev != NULL.
@ -270,10 +213,11 @@ static void pnv_npu_dma_set_32(struct pnv_ioda_pe *npe)
rc = pnv_npu_set_window(npe, 0, gpe->table_group.tables[0]);
/*
* We don't initialise npu_pe->tce32_table as we always use
* dma_npu_ops which are nops.
* NVLink devices use the same TCE table configuration as
* their parent device so drivers shouldn't be doing DMA
* operations directly on these devices.
*/
set_dma_ops(&npe->pdev->dev, &dma_npu_ops);
set_dma_ops(&npe->pdev->dev, NULL);
}
/*

21
tools/testing/selftests/powerpc/mm/wild_bctr.c
View File

@ -47,8 +47,9 @@ static int ok(void)
return 0;
}
#define REG_POISON 0x5a5aUL
#define POISONED_REG(n) ((REG_POISON << 48) | ((n) << 32) | (REG_POISON << 16) | (n))
#define REG_POISON 0x5a5a
#define POISONED_REG(n) ((((unsigned long)REG_POISON) << 48) | ((n) << 32) | \
(((unsigned long)REG_POISON) << 16) | (n))
static inline void poison_regs(void)
{
@ -105,6 +106,20 @@ static void dump_regs(void)
}
}
#ifdef _CALL_AIXDESC
struct opd {
unsigned long ip;
unsigned long toc;
unsigned long env;
};
static struct opd bad_opd = {
.ip = BAD_NIP,
};
#define BAD_FUNC (&bad_opd)
#else
#define BAD_FUNC BAD_NIP
#endif
int test_wild_bctr(void)
{
int (*func_ptr)(void);
@ -133,7 +148,7 @@ int test_wild_bctr(void)
poison_regs();
func_ptr = (int (*)(void))BAD_NIP;
func_ptr = (int (*)(void))BAD_FUNC;
func_ptr();
FAIL_IF(1); /* we didn't segv? */