Re: [PATCH v4 1/6] powerpc: prefer memblock APIs returning virtual address

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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@xxxxxxxxxxxxx>
---
  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);




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