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Date: Fri, 23 Feb 2018 11:51:25 -0700
From: Khalid Aziz <khalid.aziz@...cle.com>
To: davem@...emloft.net
Cc: kbuild-all@...org, akpm@...ux-foundation.org,
dave.hansen@...ux.intel.com, corbet@....net, bob.picco@...cle.com,
steven.sistare@...cle.com, pasha.tatashin@...cle.com,
mike.kravetz@...cle.com, rob.gardner@...cle.com, mingo@...nel.org,
nitin.m.gupta@...cle.com, anthony.yznaga@...cle.com,
kirill.shutemov@...ux.intel.com, tom.hromatka@...cle.com,
allen.pais@...cle.com, tklauser@...tanz.ch,
shannon.nelson@...cle.com, vijay.ac.kumar@...cle.com,
mhocko@...e.com, jack@...e.cz, punit.agrawal@....com,
hughd@...gle.com, thomas.tai@...cle.com,
ross.zwisler@...ux.intel.com, dave.jiang@...el.com,
willy@...radead.org, minchan@...nel.org,
imbrenda@...ux.vnet.ibm.com, aarcange@...hat.com,
kstewart@...uxfoundation.org, pombredanne@...b.com,
tglx@...utronix.de, gregkh@...uxfoundation.org,
nagarathnam.muthusamy@...cle.com, linux@...ck-us.net,
jane.chu@...cle.com, dan.j.williams@...el.com, jglisse@...hat.com,
ktkhai@...tuozzo.com, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
sparclinux@...r.kernel.org, Khalid Aziz <khalid@...ehiking.org>
Subject: Re: [PATCH v12 10/11] sparc64: Add support for ADI (Application Data
Integrity)
On 02/22/2018 07:50 PM, kbuild test robot wrote:
> Hi Khalid,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on sparc-next/master]
> [also build test ERROR on v4.16-rc2]
> [cannot apply to next-20180222]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/Khalid-Aziz/Application-Data-Integrity-feature-introduced-by-SPARC-M7/20180223-071725
> base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next.git master
> config: sparc64-allyesconfig (attached as .config)
> compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> make.cross ARCH=sparc64
>
> All error/warnings (new ones prefixed by >>):
Hi Dave,
Including linux/sched.h in arch/sparc/include/asm/mmu_context.h should
eliminate these build warnings. My gcc version 6.2.1 does not report
these errors. Build bot is using 7.2.0.
I can add a patch 12 to add the include, revise patch 10 or you can add
the include in your tree. Let me know how you would prefer to resolve this.
Thanks,
Khalid
>
> In file included from arch/sparc/include/asm/mmu_context.h:5:0,
> from include/linux/mmu_context.h:5,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h:29,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:23:
> arch/sparc/include/asm/mmu_context_64.h: In function 'arch_start_context_switch':
>>> arch/sparc/include/asm/mmu_context_64.h:157:4: error: implicit declaration of function 'set_tsk_thread_flag'; did you mean 'set_ti_thread_flag'? [-Werror=implicit-function-declaration]
> set_tsk_thread_flag(prev, TIF_MCDPER);
> ^~~~~~~~~~~~~~~~~~~
> set_ti_thread_flag
>>> arch/sparc/include/asm/mmu_context_64.h:159:4: error: implicit declaration of function 'clear_tsk_thread_flag'; did you mean 'clear_ti_thread_flag'? [-Werror=implicit-function-declaration]
> clear_tsk_thread_flag(prev, TIF_MCDPER);
> ^~~~~~~~~~~~~~~~~~~~~
> clear_ti_thread_flag
> arch/sparc/include/asm/mmu_context_64.h: In function 'finish_arch_post_lock_switch':
>>> arch/sparc/include/asm/mmu_context_64.h:180:25: error: dereferencing pointer to incomplete type 'struct task_struct'
> if (current && current->mm && current->mm->context.adi) {
> ^~
> In file included from arch/sparc/include/asm/processor.h:5:0,
> from arch/sparc/include/asm/spinlock_64.h:12,
> from arch/sparc/include/asm/spinlock.h:5,
> from include/linux/spinlock.h:88,
> from arch/sparc/include/asm/mmu_context_64.h:9,
> from arch/sparc/include/asm/mmu_context.h:5,
> from include/linux/mmu_context.h:5,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h:29,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:23:
>>> arch/sparc/include/asm/processor_64.h:194:28: error: implicit declaration of function 'task_thread_info'; did you mean 'test_thread_flag'? [-Werror=implicit-function-declaration]
> #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
> ^
>>> arch/sparc/include/asm/mmu_context_64.h:183:11: note: in expansion of macro 'task_pt_regs'
> regs = task_pt_regs(current);
> ^~~~~~~~~~~~
>>> arch/sparc/include/asm/processor_64.h:194:49: error: invalid type argument of '->' (have 'int')
> #define task_pt_regs(tsk) (task_thread_info(tsk)->kregs)
> ^
>>> arch/sparc/include/asm/mmu_context_64.h:183:11: note: in expansion of macro 'task_pt_regs'
> regs = task_pt_regs(current);
> ^~~~~~~~~~~~
> In file included from include/linux/cred.h:21:0,
> from include/linux/seq_file.h:12,
> from include/linux/pinctrl/consumer.h:17,
> from include/linux/pinctrl/devinfo.h:21,
> from include/linux/device.h:23,
> from include/linux/cdev.h:8,
> from include/drm/drmP.h:36,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:25:
> include/linux/sched.h: At top level:
>>> include/linux/sched.h:1530:20: warning: conflicting types for 'set_tsk_thread_flag'
> static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
> ^~~~~~~~~~~~~~~~~~~
>>> include/linux/sched.h:1530:20: error: static declaration of 'set_tsk_thread_flag' follows non-static declaration
> In file included from arch/sparc/include/asm/mmu_context.h:5:0,
> from include/linux/mmu_context.h:5,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h:29,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:23:
> arch/sparc/include/asm/mmu_context_64.h:157:4: note: previous implicit declaration of 'set_tsk_thread_flag' was here
> set_tsk_thread_flag(prev, TIF_MCDPER);
> ^~~~~~~~~~~~~~~~~~~
> In file included from include/linux/cred.h:21:0,
> from include/linux/seq_file.h:12,
> from include/linux/pinctrl/consumer.h:17,
> from include/linux/pinctrl/devinfo.h:21,
> from include/linux/device.h:23,
> from include/linux/cdev.h:8,
> from include/drm/drmP.h:36,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:25:
>>> include/linux/sched.h:1535:20: warning: conflicting types for 'clear_tsk_thread_flag'
> static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
> ^~~~~~~~~~~~~~~~~~~~~
>>> include/linux/sched.h:1535:20: error: static declaration of 'clear_tsk_thread_flag' follows non-static declaration
> In file included from arch/sparc/include/asm/mmu_context.h:5:0,
> from include/linux/mmu_context.h:5,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h:29,
> from drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:23:
> arch/sparc/include/asm/mmu_context_64.h:159:4: note: previous implicit declaration of 'clear_tsk_thread_flag' was here
> clear_tsk_thread_flag(prev, TIF_MCDPER);
> ^~~~~~~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
>
> vim +157 arch/sparc/include/asm/mmu_context_64.h
>
> 8
> > 9 #include <linux/spinlock.h>
> 10 #include <linux/mm_types.h>
> 11 #include <linux/smp.h>
> 12
> 13 #include <asm/spitfire.h>
> 14 #include <asm/adi_64.h>
> 15 #include <asm-generic/mm_hooks.h>
> 16 #include <asm/percpu.h>
> 17
> 18 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
> 19 {
> 20 }
> 21
> 22 extern spinlock_t ctx_alloc_lock;
> 23 extern unsigned long tlb_context_cache;
> 24 extern unsigned long mmu_context_bmap[];
> 25
> 26 DECLARE_PER_CPU(struct mm_struct *, per_cpu_secondary_mm);
> 27 void get_new_mmu_context(struct mm_struct *mm);
> 28 int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
> 29 void destroy_context(struct mm_struct *mm);
> 30
> 31 void __tsb_context_switch(unsigned long pgd_pa,
> 32 struct tsb_config *tsb_base,
> 33 struct tsb_config *tsb_huge,
> 34 unsigned long tsb_descr_pa,
> 35 unsigned long secondary_ctx);
> 36
> 37 static inline void tsb_context_switch_ctx(struct mm_struct *mm,
> 38 unsigned long ctx)
> 39 {
> 40 __tsb_context_switch(__pa(mm->pgd),
> 41 &mm->context.tsb_block[MM_TSB_BASE],
> 42 #if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)
> 43 (mm->context.tsb_block[MM_TSB_HUGE].tsb ?
> 44 &mm->context.tsb_block[MM_TSB_HUGE] :
> 45 NULL)
> 46 #else
> 47 NULL
> 48 #endif
> 49 , __pa(&mm->context.tsb_descr[MM_TSB_BASE]),
> 50 ctx);
> 51 }
> 52
> 53 #define tsb_context_switch(X) tsb_context_switch_ctx(X, 0)
> 54
> 55 void tsb_grow(struct mm_struct *mm,
> 56 unsigned long tsb_index,
> 57 unsigned long mm_rss);
> 58 #ifdef CONFIG_SMP
> 59 void smp_tsb_sync(struct mm_struct *mm);
> 60 #else
> 61 #define smp_tsb_sync(__mm) do { } while (0)
> 62 #endif
> 63
> 64 /* Set MMU context in the actual hardware. */
> 65 #define load_secondary_context(__mm) \
> 66 __asm__ __volatile__( \
> 67 "\n661: stxa %0, [%1] %2\n" \
> 68 " .section .sun4v_1insn_patch, \"ax\"\n" \
> 69 " .word 661b\n" \
> 70 " stxa %0, [%1] %3\n" \
> 71 " .previous\n" \
> 72 " flush %%g6\n" \
> 73 : /* No outputs */ \
> 74 : "r" (CTX_HWBITS((__mm)->context)), \
> 75 "r" (SECONDARY_CONTEXT), "i" (ASI_DMMU), "i" (ASI_MMU))
> 76
> 77 void __flush_tlb_mm(unsigned long, unsigned long);
> 78
> 79 /* Switch the current MM context. */
> 80 static inline void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk)
> 81 {
> 82 unsigned long ctx_valid, flags;
> 83 int cpu = smp_processor_id();
> 84
> 85 per_cpu(per_cpu_secondary_mm, cpu) = mm;
> 86 if (unlikely(mm == &init_mm))
> 87 return;
> 88
> 89 spin_lock_irqsave(&mm->context.lock, flags);
> 90 ctx_valid = CTX_VALID(mm->context);
> 91 if (!ctx_valid)
> 92 get_new_mmu_context(mm);
> 93
> 94 /* We have to be extremely careful here or else we will miss
> 95 * a TSB grow if we switch back and forth between a kernel
> 96 * thread and an address space which has it's TSB size increased
> 97 * on another processor.
> 98 *
> 99 * It is possible to play some games in order to optimize the
> 100 * switch, but the safest thing to do is to unconditionally
> 101 * perform the secondary context load and the TSB context switch.
> 102 *
> 103 * For reference the bad case is, for address space "A":
> 104 *
> 105 * CPU 0 CPU 1
> 106 * run address space A
> 107 * set cpu0's bits in cpu_vm_mask
> 108 * switch to kernel thread, borrow
> 109 * address space A via entry_lazy_tlb
> 110 * run address space A
> 111 * set cpu1's bit in cpu_vm_mask
> 112 * flush_tlb_pending()
> 113 * reset cpu_vm_mask to just cpu1
> 114 * TSB grow
> 115 * run address space A
> 116 * context was valid, so skip
> 117 * TSB context switch
> 118 *
> 119 * At that point cpu0 continues to use a stale TSB, the one from
> 120 * before the TSB grow performed on cpu1. cpu1 did not cross-call
> 121 * cpu0 to update it's TSB because at that point the cpu_vm_mask
> 122 * only had cpu1 set in it.
> 123 */
> 124 tsb_context_switch_ctx(mm, CTX_HWBITS(mm->context));
> 125
> 126 /* Any time a processor runs a context on an address space
> 127 * for the first time, we must flush that context out of the
> 128 * local TLB.
> 129 */
> 130 if (!ctx_valid || !cpumask_test_cpu(cpu, mm_cpumask(mm))) {
> 131 cpumask_set_cpu(cpu, mm_cpumask(mm));
> 132 __flush_tlb_mm(CTX_HWBITS(mm->context),
> 133 SECONDARY_CONTEXT);
> 134 }
> 135 spin_unlock_irqrestore(&mm->context.lock, flags);
> 136 }
> 137
> 138 #define deactivate_mm(tsk,mm) do { } while (0)
> 139 #define activate_mm(active_mm, mm) switch_mm(active_mm, mm, NULL)
> 140
> 141 #define __HAVE_ARCH_START_CONTEXT_SWITCH
> 142 static inline void arch_start_context_switch(struct task_struct *prev)
> 143 {
> 144 /* Save the current state of MCDPER register for the process
> 145 * we are switching from
> 146 */
> 147 if (adi_capable()) {
> 148 register unsigned long tmp_mcdper;
> 149
> 150 __asm__ __volatile__(
> 151 ".word 0x83438000\n\t" /* rd %mcdper, %g1 */
> 152 "mov %%g1, %0\n\t"
> 153 : "=r" (tmp_mcdper)
> 154 :
> 155 : "g1");
> 156 if (tmp_mcdper)
> > 157 set_tsk_thread_flag(prev, TIF_MCDPER);
> 158 else
> > 159 clear_tsk_thread_flag(prev, TIF_MCDPER);
> 160 }
> 161 }
> 162
> 163 #define finish_arch_post_lock_switch finish_arch_post_lock_switch
> 164 static inline void finish_arch_post_lock_switch(void)
> 165 {
> 166 /* Restore the state of MCDPER register for the new process
> 167 * just switched to.
> 168 */
> 169 if (adi_capable()) {
> 170 register unsigned long tmp_mcdper;
> 171
> 172 tmp_mcdper = test_thread_flag(TIF_MCDPER);
> 173 __asm__ __volatile__(
> 174 "mov %0, %%g1\n\t"
> 175 ".word 0x9d800001\n\t" /* wr %g0, %g1, %mcdper" */
> 176 ".word 0xaf902001\n\t" /* wrpr %g0, 1, %pmcdper */
> 177 :
> 178 : "ir" (tmp_mcdper)
> 179 : "g1");
> > 180 if (current && current->mm && current->mm->context.adi) {
> 181 struct pt_regs *regs;
> 182
> > 183 regs = task_pt_regs(current);
> 184 regs->tstate |= TSTATE_MCDE;
> 185 }
> 186 }
> 187 }
> 188
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
>
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