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Subject: Re: [PATCH v4 1/6] powerpc: prefer memblock APIs returning virtual
 address
To:     Mike Rapoport <rppt@linux.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Michal Hocko <mhocko@suse.com>, linux-sh@vger.kernel.org,
        Heiko Carstens <heiko.carstens@de.ibm.com>, linux-mm@kvack.org,
        Rich Felker <dalias@libc.org>,
        Paul Mackerras <paulus@samba.org>, sparclinux@vger.kernel.org,
        Vincent Chen <deanbo422@gmail.com>,
        Jonas Bonn <jonas@southpole.se>, linux-s390@vger.kernel.org,
        linux-c6x-dev@linux-c6x.org,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Russell King <linux@armlinux.org.uk>,
        Mark Salter <msalter@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
        openrisc@lists.librecores.org, Greentime Hu <green.hu@gmail.com>,
        Stafford Horne <shorne@gmail.com>,
        Guan Xuetao <gxt@pku.edu.cn>,
        linux-arm-kernel@lists.infradead.org,
        Michal Simek <monstr@monstr.eu>, linux-kernel@vger.kernel.org,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        linuxppc-dev@lists.ozlabs.org,
        "David S. Miller" <davem@davemloft.net>
References: <1546248566-14910-1-git-send-email-rppt@linux.ibm.com>
 <1546248566-14910-2-git-send-email-rppt@linux.ibm.com>
From:   Christophe Leroy <christophe.leroy@c-s.fr>
Message-ID: <282fd5d1-24b5-81ac-b7ff-7329fe3c0fe1@c-s.fr>
Date:   Tue, 8 Jan 2019 11:02:24 +0100
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Le 31/12/2018 à 10:29, Mike Rapoport a écrit :
> There are a several places that allocate memory using memblock APIs that
> return a physical address, convert the returned address to the virtual
> address and frequently also memset(0) the allocated range.
> 
> Update these places to use memblock allocators already returning a virtual
> address. Use memblock functions that clear the allocated memory instead of
> calling memset(0) where appropriate.
> 
> The calls to memblock_alloc_base() that were not followed by memset(0) are
> replaced with memblock_alloc_try_nid_raw(). Since the latter does not
> panic() when the allocation fails, the appropriate panic() calls are added
> to the call sites.
> 
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
>   arch/powerpc/kernel/paca.c             | 16 ++++++----------
>   arch/powerpc/kernel/setup_64.c         | 24 ++++++++++--------------
>   arch/powerpc/mm/hash_utils_64.c        |  6 +++---
>   arch/powerpc/mm/pgtable-book3e.c       |  8 ++------
>   arch/powerpc/mm/pgtable-book3s64.c     |  5 +----
>   arch/powerpc/mm/pgtable-radix.c        | 25 +++++++------------------
>   arch/powerpc/platforms/pasemi/iommu.c  |  5 +++--
>   arch/powerpc/platforms/pseries/setup.c | 18 ++++++++++++++----
>   arch/powerpc/sysdev/dart_iommu.c       |  7 +++++--
>   9 files changed, 51 insertions(+), 63 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
> index 913bfca..276d36d4 100644
> --- a/arch/powerpc/kernel/paca.c
> +++ b/arch/powerpc/kernel/paca.c
> @@ -27,7 +27,7 @@
>   static void *__init alloc_paca_data(unsigned long size, unsigned long align,
>   				unsigned long limit, int cpu)
>   {
> -	unsigned long pa;
> +	void *ptr;
>   	int nid;
>   
>   	/*
> @@ -42,17 +42,15 @@ static void *__init alloc_paca_data(unsigned long size, unsigned long align,
>   		nid = early_cpu_to_node(cpu);
>   	}
>   
> -	pa = memblock_alloc_base_nid(size, align, limit, nid, MEMBLOCK_NONE);
> -	if (!pa) {
> -		pa = memblock_alloc_base(size, align, limit);
> -		if (!pa)
> -			panic("cannot allocate paca data");
> -	}
> +	ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
> +				     limit, nid);
> +	if (!ptr)
> +		panic("cannot allocate paca data");

AFAIKS, memblock_alloc_try_nid() panics if memblock_alloc_internal() 
returns NULL, so the above panic is useless, isn't it ?

>   
>   	if (cpu == boot_cpuid)
>   		memblock_set_bottom_up(false);
>   
> -	return __va(pa);
> +	return ptr;
>   }
>   
>   #ifdef CONFIG_PPC_PSERIES
> @@ -118,7 +116,6 @@ static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
>   	}
>   
>   	s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
> -	memset(s, 0, sizeof(*s));
>   
>   	s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
>   	s->buffer_length = cpu_to_be32(sizeof(*s));
> @@ -222,7 +219,6 @@ void __init allocate_paca(int cpu)
>   	paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
>   				limit, cpu);
>   	paca_ptrs[cpu] = paca;
> -	memset(paca, 0, sizeof(struct paca_struct));
>   
>   	initialise_paca(paca, cpu);
>   #ifdef CONFIG_PPC_PSERIES
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index 236c115..3dcd779 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -634,19 +634,17 @@ __init u64 ppc64_bolted_size(void)
>   
>   static void *__init alloc_stack(unsigned long limit, int cpu)
>   {
> -	unsigned long pa;
> +	void *ptr;
>   
>   	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) {
> -		pa = memblock_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
> -		if (!pa)
> -			panic("cannot allocate stacks");
> -	}
> +	ptr = memblock_alloc_try_nid(THREAD_SIZE, THREAD_SIZE,
> +				     MEMBLOCK_LOW_LIMIT, limit,
> +				     early_cpu_to_node(cpu));
> +	if (!ptr)
> +		panic("cannot allocate stacks");

Same ?

Christophe

>   
> -	return __va(pa);
> +	return ptr;
>   }
>   
>   void __init irqstack_early_init(void)
> @@ -739,20 +737,17 @@ void __init emergency_stack_init(void)
>   		struct thread_info *ti;
>   
>   		ti = alloc_stack(limit, i);
> -		memset(ti, 0, THREAD_SIZE);
>   		emerg_stack_init_thread_info(ti, i);
>   		paca_ptrs[i]->emergency_sp = (void *)ti + THREAD_SIZE;
>   
>   #ifdef CONFIG_PPC_BOOK3S_64
>   		/* emergency stack for NMI exception handling. */
>   		ti = alloc_stack(limit, i);
> -		memset(ti, 0, THREAD_SIZE);
>   		emerg_stack_init_thread_info(ti, i);
>   		paca_ptrs[i]->nmi_emergency_sp = (void *)ti + THREAD_SIZE;
>   
>   		/* emergency stack for machine check exception handling. */
>   		ti = alloc_stack(limit, i);
> -		memset(ti, 0, THREAD_SIZE);
>   		emerg_stack_init_thread_info(ti, i);
>   		paca_ptrs[i]->mc_emergency_sp = (void *)ti + THREAD_SIZE;
>   #endif
> @@ -933,8 +928,9 @@ static void __ref init_fallback_flush(void)
>   	 * hardware prefetch runoff. We don't have a recipe for load patterns to
>   	 * reliably avoid the prefetcher.
>   	 */
> -	l1d_flush_fallback_area = __va(memblock_alloc_base(l1d_size * 2, l1d_size, limit));
> -	memset(l1d_flush_fallback_area, 0, l1d_size * 2);
> +	l1d_flush_fallback_area = memblock_alloc_try_nid(l1d_size * 2,
> +						l1d_size, MEMBLOCK_LOW_LIMIT,
> +						limit, NUMA_NO_NODE);
>   
>   	for_each_possible_cpu(cpu) {
>   		struct paca_struct *paca = paca_ptrs[cpu];
> diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
> index 0cc7fbc..bc6be44 100644
> --- a/arch/powerpc/mm/hash_utils_64.c
> +++ b/arch/powerpc/mm/hash_utils_64.c
> @@ -908,9 +908,9 @@ static void __init htab_initialize(void)
>   #ifdef CONFIG_DEBUG_PAGEALLOC
>   	if (debug_pagealloc_enabled()) {
>   		linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
> -		linear_map_hash_slots = __va(memblock_alloc_base(
> -				linear_map_hash_count, 1, ppc64_rma_size));
> -		memset(linear_map_hash_slots, 0, linear_map_hash_count);
> +		linear_map_hash_slots = memblock_alloc_try_nid(
> +				linear_map_hash_count, 1, MEMBLOCK_LOW_LIMIT,
> +				ppc64_rma_size,	NUMA_NO_NODE);
>   	}
>   #endif /* CONFIG_DEBUG_PAGEALLOC */
>   
> diff --git a/arch/powerpc/mm/pgtable-book3e.c b/arch/powerpc/mm/pgtable-book3e.c
> index e0ccf36..53cbc7d 100644
> --- a/arch/powerpc/mm/pgtable-book3e.c
> +++ b/arch/powerpc/mm/pgtable-book3e.c
> @@ -57,12 +57,8 @@ void vmemmap_remove_mapping(unsigned long start,
>   
>   static __ref void *early_alloc_pgtable(unsigned long size)
>   {
> -	void *pt;
> -
> -	pt = __va(memblock_alloc_base(size, size, __pa(MAX_DMA_ADDRESS)));
> -	memset(pt, 0, size);
> -
> -	return pt;
> +	return memblock_alloc_try_nid(size, size, MEMBLOCK_LOW_LIMIT,
> +				      __pa(MAX_DMA_ADDRESS), NUMA_NO_NODE);
>   }
>   
>   /*
> diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
> index f3c31f5..55876b7 100644
> --- a/arch/powerpc/mm/pgtable-book3s64.c
> +++ b/arch/powerpc/mm/pgtable-book3s64.c
> @@ -195,11 +195,8 @@ void __init mmu_partition_table_init(void)
>   	unsigned long ptcr;
>   
>   	BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large.");
> -	partition_tb = __va(memblock_alloc_base(patb_size, patb_size,
> -						MEMBLOCK_ALLOC_ANYWHERE));
> -
>   	/* Initialize the Partition Table with no entries */
> -	memset((void *)partition_tb, 0, patb_size);
> +	partition_tb = memblock_alloc(patb_size, patb_size);
>   
>   	/*
>   	 * update partition table control register,
> diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
> index 9311560..29bcea5 100644
> --- a/arch/powerpc/mm/pgtable-radix.c
> +++ b/arch/powerpc/mm/pgtable-radix.c
> @@ -51,26 +51,15 @@ static int native_register_process_table(unsigned long base, unsigned long pg_sz
>   static __ref void *early_alloc_pgtable(unsigned long size, int nid,
>   			unsigned long region_start, unsigned long region_end)
>   {
> -	unsigned long pa = 0;
> -	void *pt;
> +	phys_addr_t min_addr = MEMBLOCK_LOW_LIMIT;
> +	phys_addr_t max_addr = MEMBLOCK_ALLOC_ANYWHERE;
>   
> -	if (region_start || region_end) /* has region hint */
> -		pa = memblock_alloc_range(size, size, region_start, region_end,
> -						MEMBLOCK_NONE);
> -	else if (nid != -1) /* has node hint */
> -		pa = memblock_alloc_base_nid(size, size,
> -						MEMBLOCK_ALLOC_ANYWHERE,
> -						nid, MEMBLOCK_NONE);
> +	if (region_start)
> +		min_addr = region_start;
> +	if (region_end)
> +		max_addr = region_end;
>   
> -	if (!pa)
> -		pa = memblock_alloc_base(size, size, MEMBLOCK_ALLOC_ANYWHERE);
> -
> -	BUG_ON(!pa);
> -
> -	pt = __va(pa);
> -	memset(pt, 0, size);
> -
> -	return pt;
> +	return memblock_alloc_try_nid(size, size, min_addr, max_addr, nid);
>   }
>   
>   static int early_map_kernel_page(unsigned long ea, unsigned long pa,
> diff --git a/arch/powerpc/platforms/pasemi/iommu.c b/arch/powerpc/platforms/pasemi/iommu.c
> index f297152..f62930f 100644
> --- a/arch/powerpc/platforms/pasemi/iommu.c
> +++ b/arch/powerpc/platforms/pasemi/iommu.c
> @@ -208,7 +208,9 @@ static int __init iob_init(struct device_node *dn)
>   	pr_debug(" -> %s\n", __func__);
>   
>   	/* For 2G space, 8x64 pages (2^21 bytes) is max total l2 size */
> -	iob_l2_base = (u32 *)__va(memblock_alloc_base(1UL<<21, 1UL<<21, 0x80000000));
> +	iob_l2_base = memblock_alloc_try_nid_raw(1UL << 21, 1UL << 21,
> +					MEMBLOCK_LOW_LIMIT, 0x80000000,
> +					NUMA_NO_NODE);
>   
>   	pr_info("IOBMAP L2 allocated at: %p\n", iob_l2_base);
>   
> @@ -269,4 +271,3 @@ void __init iommu_init_early_pasemi(void)
>   	pasemi_pci_controller_ops.dma_bus_setup = pci_dma_bus_setup_pasemi;
>   	set_pci_dma_ops(&dma_iommu_ops);
>   }
> -
> diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
> index 41f62ca2..e4f0dfd 100644
> --- a/arch/powerpc/platforms/pseries/setup.c
> +++ b/arch/powerpc/platforms/pseries/setup.c
> @@ -130,8 +130,13 @@ static void __init fwnmi_init(void)
>   	 * It will be used in real mode mce handler, hence it needs to be
>   	 * below RMA.
>   	 */
> -	mce_data_buf = __va(memblock_alloc_base(RTAS_ERROR_LOG_MAX * nr_cpus,
> -					RTAS_ERROR_LOG_MAX, ppc64_rma_size));
> +	mce_data_buf = memblock_alloc_try_nid_raw(RTAS_ERROR_LOG_MAX * nr_cpus,
> +					RTAS_ERROR_LOG_MAX, MEMBLOCK_LOW_LIMIT,
> +					ppc64_rma_size, NUMA_NO_NODE);
> +	if (!mce_data_buf)
> +		panic("Failed to allocate %d bytes below %pa for MCE buffer\n",
> +		      RTAS_ERROR_LOG_MAX * nr_cpus, &ppc64_rma_size);
> +
>   	for_each_possible_cpu(i) {
>   		paca_ptrs[i]->mce_data_buf = mce_data_buf +
>   						(RTAS_ERROR_LOG_MAX * i);
> @@ -140,8 +145,13 @@ static void __init fwnmi_init(void)
>   #ifdef CONFIG_PPC_BOOK3S_64
>   	/* Allocate per cpu slb area to save old slb contents during MCE */
>   	size = sizeof(struct slb_entry) * mmu_slb_size * nr_cpus;
> -	slb_ptr = __va(memblock_alloc_base(size, sizeof(struct slb_entry),
> -					   ppc64_rma_size));
> +	slb_ptr = memblock_alloc_try_nid_raw(size, sizeof(struct slb_entry),
> +					MEMBLOCK_LOW_LIMIT, ppc64_rma_size,
> +					NUMA_NO_NODE);
> +	if (!slb_ptr)
> +		panic("Failed to allocate %zu bytes below %pa for slb area\n",
> +		      size, &ppc64_rma_size);
> +
>   	for_each_possible_cpu(i)
>   		paca_ptrs[i]->mce_faulty_slbs = slb_ptr + (mmu_slb_size * i);
>   #endif
> diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
> index a5b40d1..25bc25f 100644
> --- a/arch/powerpc/sysdev/dart_iommu.c
> +++ b/arch/powerpc/sysdev/dart_iommu.c
> @@ -251,8 +251,11 @@ static void allocate_dart(void)
>   	 * 16MB (1 << 24) alignment. We allocate a full 16Mb chuck since we
>   	 * will blow up an entire large page anyway in the kernel mapping.
>   	 */
> -	dart_tablebase = __va(memblock_alloc_base(1UL<<24,
> -						  1UL<<24, 0x80000000L));
> +	dart_tablebase = memblock_alloc_try_nid_raw(SZ_16M, SZ_16M,
> +					MEMBLOCK_LOW_LIMIT, SZ_2G,
> +					NUMA_NO_NODE);
> +	if (!dart_tablebase)
> +		panic("Failed to allocate 16MB below 2GB for DART table\n");
>   
>   	/* There is no point scanning the DART space for leaks*/
>   	kmemleak_no_scan((void *)dart_tablebase);
>