bcm27xx: update 5.4 patches from RPi foundation

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

1 files changed, 195 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0450-dma-direct-turn-ARCH_ZONE_DMA_BITS-into-a-variable.patch b/target/linux/bcm27xx/patches-5.4/950-0450-dma-direct-turn-ARCH_ZONE_DMA_BITS-into-a-variable.patch
new file mode 100644
index 0000000000..5de73d37f7
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0450-dma-direct-turn-ARCH_ZONE_DMA_BITS-into-a-variable.patch
@@ -0,0 +1,195 @@
+From 78b03f0aef9f67c4db700ba5dc56e2c8f562d181 Mon Sep 17 00:00:00 2001
+From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Date: Mon, 14 Oct 2019 20:31:03 +0200
+Subject: [PATCH] dma/direct: turn ARCH_ZONE_DMA_BITS into a variable
+
+commit 8b5369ea580964dbc982781bfb9fb93459fc5e8d upstream.
+
+Some architectures, notably ARM, are interested in tweaking this
+depending on their runtime DMA addressing limitations.
+
+Acked-by: Christoph Hellwig <hch@lst.de>
+Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
+---
+ arch/arm64/include/asm/page.h   |  2 --
+ arch/arm64/mm/init.c            |  9 +++++++--
+ arch/powerpc/include/asm/page.h |  9 ---------
+ arch/powerpc/mm/mem.c           | 20 +++++++++++++++-----
+ arch/s390/include/asm/page.h    |  2 --
+ arch/s390/mm/init.c             |  1 +
+ include/linux/dma-direct.h      |  2 ++
+ kernel/dma/direct.c             | 13 ++++++-------
+ 8 files changed, 31 insertions(+), 27 deletions(-)
+
+--- a/arch/arm64/include/asm/page.h
++++ b/arch/arm64/include/asm/page.h
+@@ -38,6 +38,4 @@ 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
+@@ -20,6 +20,7 @@
+ #include <linux/sort.h>
+ #include <linux/of.h>
+ #include <linux/of_fdt.h>
++#include <linux/dma-direct.h>
+ #include <linux/dma-mapping.h>
+ #include <linux/dma-contiguous.h>
+ #include <linux/efi.h>
+@@ -41,6 +42,8 @@
+ #include <asm/tlb.h>
+ #include <asm/alternative.h>
+ 
++#define ARM64_ZONE_DMA_BITS	30
++
+ /*
+  * We need to be able to catch inadvertent references to memstart_addr
+  * that occur (potentially in generic code) before arm64_memblock_init()
+@@ -440,8 +443,10 @@ void __init arm64_memblock_init(void)
+ 
+ 	early_init_fdt_scan_reserved_mem();
+ 
+-	if (IS_ENABLED(CONFIG_ZONE_DMA))
+-		arm64_dma_phys_limit = max_zone_phys(ARCH_ZONE_DMA_BITS);
++	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
++		zone_dma_bits = ARM64_ZONE_DMA_BITS;
++		arm64_dma_phys_limit = max_zone_phys(ARM64_ZONE_DMA_BITS);
++	}
+ 
+ 	if (IS_ENABLED(CONFIG_ZONE_DMA32))
+ 		arm64_dma32_phys_limit = max_zone_phys(32);
+--- a/arch/powerpc/include/asm/page.h
++++ b/arch/powerpc/include/asm/page.h
+@@ -334,13 +334,4 @@ struct vm_area_struct;
+ #endif /* __ASSEMBLY__ */
+ #include <asm/slice.h>
+ 
+-/*
+- * Allow 30-bit DMA for very limited Broadcom wifi chips on many powerbooks.
+- */
+-#ifdef CONFIG_PPC32
+-#define ARCH_ZONE_DMA_BITS 30
+-#else
+-#define ARCH_ZONE_DMA_BITS 31
+-#endif
+-
+ #endif /* _ASM_POWERPC_PAGE_H */
+--- a/arch/powerpc/mm/mem.c
++++ b/arch/powerpc/mm/mem.c
+@@ -31,6 +31,7 @@
+ #include <linux/slab.h>
+ #include <linux/vmalloc.h>
+ #include <linux/memremap.h>
++#include <linux/dma-direct.h>
+ 
+ #include <asm/pgalloc.h>
+ #include <asm/prom.h>
+@@ -223,10 +224,10 @@ static int __init mark_nonram_nosave(voi
+  * everything else. GFP_DMA32 page allocations automatically fall back to
+  * ZONE_DMA.
+  *
+- * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
+- * inform the generic DMA mapping code.  32-bit only devices (if not handled
+- * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
+- * otherwise served by ZONE_DMA.
++ * By using 31-bit unconditionally, we can exploit zone_dma_bits to inform the
++ * generic DMA mapping code.  32-bit only devices (if not handled by an IOMMU
++ * anyway) will take a first dip into ZONE_NORMAL and get otherwise served by
++ * ZONE_DMA.
+  */
+ static unsigned long max_zone_pfns[MAX_NR_ZONES];
+ 
+@@ -259,9 +260,18 @@ void __init paging_init(void)
+ 	printk(KERN_DEBUG "Memory hole size: %ldMB\n",
+ 	       (long int)((top_of_ram - total_ram) >> 20));
+ 
++	/*
++	 * Allow 30-bit DMA for very limited Broadcom wifi chips on many
++	 * powerbooks.
++	 */
++	if (IS_ENABLED(CONFIG_PPC32))
++		zone_dma_bits = 30;
++	else
++		zone_dma_bits = 31;
++
+ #ifdef CONFIG_ZONE_DMA
+ 	max_zone_pfns[ZONE_DMA]	= min(max_low_pfn,
+-				      1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
++				      1UL << (zone_dma_bits - PAGE_SHIFT));
+ #endif
+ 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+ #ifdef CONFIG_HIGHMEM
+--- a/arch/s390/include/asm/page.h
++++ b/arch/s390/include/asm/page.h
+@@ -179,8 +179,6 @@ static inline int devmem_is_allowed(unsi
+ #define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | \
+ 				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+ 
+-#define ARCH_ZONE_DMA_BITS	31
+-
+ #include <asm-generic/memory_model.h>
+ #include <asm-generic/getorder.h>
+ 
+--- a/arch/s390/mm/init.c
++++ b/arch/s390/mm/init.c
+@@ -118,6 +118,7 @@ void __init paging_init(void)
+ 
+ 	sparse_memory_present_with_active_regions(MAX_NUMNODES);
+ 	sparse_init();
++	zone_dma_bits = 31;
+ 	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+ 	max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
+ 	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+--- a/include/linux/dma-direct.h
++++ b/include/linux/dma-direct.h
+@@ -8,6 +8,8 @@
+ 
+ static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr);
+ 
++extern unsigned int zone_dma_bits;
++
+ #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
+ #include <asm/dma-direct.h>
+ #else
+--- a/kernel/dma/direct.c
++++ b/kernel/dma/direct.c
+@@ -16,12 +16,11 @@
+ #include <linux/swiotlb.h>
+ 
+ /*
+- * Most architectures use ZONE_DMA for the first 16 Megabytes, but
+- * some use it for entirely different regions:
++ * Most architectures use ZONE_DMA for the first 16 Megabytes, but some use it
++ * it for entirely different regions. In that case the arch code needs to
++ * override the variable below for dma-direct to work properly.
+  */
+-#ifndef ARCH_ZONE_DMA_BITS
+-#define ARCH_ZONE_DMA_BITS 24
+-#endif
++unsigned int zone_dma_bits __ro_after_init = 24;
+ 
+ static void report_addr(struct device *dev, dma_addr_t dma_addr, size_t size)
+ {
+@@ -69,7 +68,7 @@ static gfp_t __dma_direct_optimal_gfp_ma
+ 	 * Note that GFP_DMA32 and GFP_DMA are no ops without the corresponding
+ 	 * zones.
+ 	 */
+-	if (*phys_mask <= DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
++	if (*phys_mask <= DMA_BIT_MASK(zone_dma_bits))
+ 		return GFP_DMA;
+ 	if (*phys_mask <= DMA_BIT_MASK(32))
+ 		return GFP_DMA32;
+@@ -395,7 +394,7 @@ int dma_direct_supported(struct device *
+ 	u64 min_mask;
+ 
+ 	if (IS_ENABLED(CONFIG_ZONE_DMA))
+-		min_mask = DMA_BIT_MASK(ARCH_ZONE_DMA_BITS);
++		min_mask = DMA_BIT_MASK(zone_dma_bits);
+ 	else
+ 		min_mask = DMA_BIT_MASK(30);
+