bcm27xx: update 5.4 patches from RPi foundation

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 174 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0447-arm64-use-both-ZONE_DMA-and-ZONE_DMA32.patch b/target/linux/bcm27xx/patches-5.4/950-0447-arm64-use-both-ZONE_DMA-and-ZONE_DMA32.patch
new file mode 100644
index 0000000000..2397c71af7
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0447-arm64-use-both-ZONE_DMA-and-ZONE_DMA32.patch
@@ -0,0 +1,174 @@
+From 1fb65f4bc30fbadd0c89521985ff8142693c9631 Mon Sep 17 00:00:00 2001
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Date: Wed, 11 Sep 2019 20:25:45 +0200
+Subject: [PATCH] arm64: use both ZONE_DMA and ZONE_DMA32
+
+commit 1a8e1cef7603e218339ac63cb3178b25554524e5 upstream.
+
+So far all arm64 devices have supported 32 bit DMA masks for their
+peripherals. This is not true anymore for the Raspberry Pi 4 as most of
+it's peripherals can only address the first GB of memory on a total of
+up to 4 GB.
+
+This goes against ZONE_DMA32's intent, as it's expected for ZONE_DMA32
+to be addressable with a 32 bit mask. So it was decided to re-introduce
+ZONE_DMA in arm64.
+
+ZONE_DMA will contain the lower 1G of memory, which is currently the
+memory area addressable by any peripheral on an arm64 device.
+ZONE_DMA32 will contain the rest of the 32 bit addressable memory.
+
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
+Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
+---
+ arch/arm64/Kconfig            |  4 +++
+ arch/arm64/include/asm/page.h |  2 ++
+ arch/arm64/mm/init.c          | 54 +++++++++++++++++++++++++----------
+ 3 files changed, 45 insertions(+), 15 deletions(-)
+
+--- a/arch/arm64/Kconfig
++++ b/arch/arm64/Kconfig
+@@ -267,6 +267,10 @@ config GENERIC_CSUM
+ config GENERIC_CALIBRATE_DELAY
+ 	def_bool y
+ 
++config ZONE_DMA
++	bool "Support DMA zone" if EXPERT
++	default y
++
+ config ZONE_DMA32
+ 	bool "Support DMA32 zone" if EXPERT
+ 	default y
+--- a/arch/arm64/include/asm/page.h
++++ b/arch/arm64/include/asm/page.h
+@@ -38,4 +38,6 @@ extern int pfn_valid(unsigned long);
+ 
+ #include <asm-generic/getorder.h>
+ 
++#define ARCH_ZONE_DMA_BITS 30
++
+ #endif
+--- a/arch/arm64/mm/init.c
++++ b/arch/arm64/mm/init.c
+@@ -56,6 +56,13 @@ EXPORT_SYMBOL(physvirt_offset);
+ struct page *vmemmap __ro_after_init;
+ EXPORT_SYMBOL(vmemmap);
+ 
++/*
++ * We create both ZONE_DMA and ZONE_DMA32. ZONE_DMA covers the first 1G of
++ * memory as some devices, namely the Raspberry Pi 4, have peripherals with
++ * this limited view of the memory. ZONE_DMA32 will cover the rest of the 32
++ * bit addressable memory area.
++ */
++phys_addr_t arm64_dma_phys_limit __ro_after_init;
+ phys_addr_t arm64_dma32_phys_limit __ro_after_init;
+ 
+ #ifdef CONFIG_KEXEC_CORE
+@@ -169,15 +176,16 @@ static void __init reserve_elfcorehdr(vo
+ {
+ }
+ #endif /* CONFIG_CRASH_DUMP */
++
+ /*
+- * Return the maximum physical address for ZONE_DMA32 (DMA_BIT_MASK(32)). It
+- * currently assumes that for memory starting above 4G, 32-bit devices will
+- * use a DMA offset.
++ * Return the maximum physical address for a zone with a given address size
++ * limit. It currently assumes that for memory starting above 4G, 32-bit
++ * devices will use a DMA offset.
+  */
+-static phys_addr_t __init max_zone_dma32_phys(void)
++static phys_addr_t __init max_zone_phys(unsigned int zone_bits)
+ {
+-	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
+-	return min(offset + (1ULL << 32), memblock_end_of_DRAM());
++	phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, zone_bits);
++	return min(offset + (1ULL << zone_bits), memblock_end_of_DRAM());
+ }
+ 
+ #ifdef CONFIG_NUMA
+@@ -186,6 +194,9 @@ static void __init zone_sizes_init(unsig
+ {
+ 	unsigned long max_zone_pfns[MAX_NR_ZONES]  = {0};
+ 
++#ifdef CONFIG_ZONE_DMA
++	max_zone_pfns[ZONE_DMA] = PFN_DOWN(arm64_dma_phys_limit);
++#endif
+ #ifdef CONFIG_ZONE_DMA32
+ 	max_zone_pfns[ZONE_DMA32] = PFN_DOWN(arm64_dma32_phys_limit);
+ #endif
+@@ -201,13 +212,18 @@ static void __init zone_sizes_init(unsig
+ 	struct memblock_region *reg;
+ 	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
+ 	unsigned long max_dma32 = min;
++	unsigned long max_dma = min;
+ 
+ 	memset(zone_size, 0, sizeof(zone_size));
+ 
+-	/* 4GB maximum for 32-bit only capable devices */
++#ifdef CONFIG_ZONE_DMA
++	max_dma = PFN_DOWN(arm64_dma_phys_limit);
++	zone_size[ZONE_DMA] = max_dma - min;
++	max_dma32 = max_dma;
++#endif
+ #ifdef CONFIG_ZONE_DMA32
+ 	max_dma32 = PFN_DOWN(arm64_dma32_phys_limit);
+-	zone_size[ZONE_DMA32] = max_dma32 - min;
++	zone_size[ZONE_DMA32] = max_dma32 - max_dma;
+ #endif
+ 	zone_size[ZONE_NORMAL] = max - max_dma32;
+ 
+@@ -219,11 +235,17 @@ static void __init zone_sizes_init(unsig
+ 
+ 		if (start >= max)
+ 			continue;
+-
++#ifdef CONFIG_ZONE_DMA
++		if (start < max_dma) {
++			unsigned long dma_end = min_not_zero(end, max_dma);
++			zhole_size[ZONE_DMA] -= dma_end - start;
++		}
++#endif
+ #ifdef CONFIG_ZONE_DMA32
+ 		if (start < max_dma32) {
+-			unsigned long dma_end = min(end, max_dma32);
+-			zhole_size[ZONE_DMA32] -= dma_end - start;
++			unsigned long dma32_end = min(end, max_dma32);
++			unsigned long dma32_start = max(start, max_dma);
++			zhole_size[ZONE_DMA32] -= dma32_end - dma32_start;
+ 		}
+ #endif
+ 		if (end > max_dma32) {
+@@ -418,9 +440,11 @@ void __init arm64_memblock_init(void)
+ 
+ 	early_init_fdt_scan_reserved_mem();
+ 
+-	/* 4GB maximum for 32-bit only capable devices */
++	if (IS_ENABLED(CONFIG_ZONE_DMA))
++		arm64_dma_phys_limit = max_zone_phys(ARCH_ZONE_DMA_BITS);
++
+ 	if (IS_ENABLED(CONFIG_ZONE_DMA32))
+-		arm64_dma32_phys_limit = max_zone_dma32_phys();
++		arm64_dma32_phys_limit = max_zone_phys(32);
+ 	else
+ 		arm64_dma32_phys_limit = PHYS_MASK + 1;
+ 
+@@ -430,7 +454,7 @@ void __init arm64_memblock_init(void)
+ 
+ 	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
+ 
+-	dma_contiguous_reserve(arm64_dma32_phys_limit);
++	dma_contiguous_reserve(arm64_dma_phys_limit ? : arm64_dma32_phys_limit);
+ }
+ 
+ void __init bootmem_init(void)
+@@ -534,7 +558,7 @@ static void __init free_unused_memmap(vo
+ void __init mem_init(void)
+ {
+ 	if (swiotlb_force == SWIOTLB_FORCE ||
+-	    max_pfn > (arm64_dma32_phys_limit >> PAGE_SHIFT))
++	    max_pfn > PFN_DOWN(arm64_dma_phys_limit ? : arm64_dma32_phys_limit))
+ 		swiotlb_init(1);
+ 	else
+ 		swiotlb_force = SWIOTLB_NO_FORCE;