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arm64: Remove arm64_dma32_phys_limit and its uses 

With the introduction of a dynamic ZONE_DMA range based on DT or IORT
information, there's no need for CMA allocations from the wider
ZONE_DMA32 since on most platforms ZONE_DMA will cover the 32-bit
addressable range. Remove the arm64_dma32_phys_limit and set
arm64_dma_phys_limit to cover the smallest DMA range required on the
platform. CMA allocation and crashkernel reservation now go in the
dynamically sized ZONE_DMA, allowing correct functionality on RPi4.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chen Zhou <chenzhou10@huawei.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> # On RPi4B
This commit is contained in:
Catalin Marinas 2021-01-07 14:40:08 +00:00
parent 7c53f6b671
commit d78050ee35
2 changed files with 19 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/arm64/include/asm/processor.h
View File

@ -94,8 +94,7 @@
#endif /* CONFIG_ARM64_FORCE_52BIT */
extern phys_addr_t arm64_dma_phys_limit;
extern phys_addr_t arm64_dma32_phys_limit;
#define ARCH_LOW_ADDRESS_LIMIT ((arm64_dma_phys_limit ? : arm64_dma32_phys_limit) - 1)
#define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1)
struct debug_info {
#ifdef CONFIG_HAVE_HW_BREAKPOINT

33
arch/arm64/mm/init.c
View File

@ -53,13 +53,13 @@ s64 memstart_addr __ro_after_init = -1;
EXPORT_SYMBOL(memstart_addr);
/*
* 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.
* If the corresponding config options are enabled, we create both ZONE_DMA
* and ZONE_DMA32. By default ZONE_DMA covers the 32-bit addressable memory
* unless restricted on specific platforms (e.g. 30-bit on Raspberry Pi 4).
* In such case, ZONE_DMA32 covers the rest of the 32-bit addressable memory,
* otherwise it is empty.
*/
phys_addr_t arm64_dma_phys_limit __ro_after_init;
phys_addr_t arm64_dma32_phys_limit __ro_after_init;
#ifdef CONFIG_KEXEC_CORE
/*
@ -84,7 +84,7 @@ static void __init reserve_crashkernel(void)
if (crash_base == 0) {
/* Current arm64 boot protocol requires 2MB alignment */
crash_base = memblock_find_in_range(0, arm64_dma32_phys_limit,
crash_base = memblock_find_in_range(0, arm64_dma_phys_limit,
crash_size, SZ_2M);
if (crash_base == 0) {
pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
@ -196,6 +196,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
unsigned long max_zone_pfns[MAX_NR_ZONES] = {0};
unsigned int __maybe_unused acpi_zone_dma_bits;
unsigned int __maybe_unused dt_zone_dma_bits;
phys_addr_t __maybe_unused dma32_phys_limit = max_zone_phys(32);
#ifdef CONFIG_ZONE_DMA
acpi_zone_dma_bits = fls64(acpi_iort_dma_get_max_cpu_address());
@ -205,8 +206,12 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
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);
max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
if (!arm64_dma_phys_limit)
arm64_dma_phys_limit = dma32_phys_limit;
#endif
if (!arm64_dma_phys_limit)
arm64_dma_phys_limit = PHYS_MASK + 1;
max_zone_pfns[ZONE_NORMAL] = max;
free_area_init(max_zone_pfns);
@ -394,16 +399,9 @@ void __init arm64_memblock_init(void)
early_init_fdt_scan_reserved_mem();
if (IS_ENABLED(CONFIG_ZONE_DMA32))
arm64_dma32_phys_limit = max_zone_phys(32);
else
arm64_dma32_phys_limit = PHYS_MASK + 1;
reserve_elfcorehdr();
high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
dma_contiguous_reserve(arm64_dma32_phys_limit);
}
void __init bootmem_init(void)
@ -438,6 +436,11 @@ void __init bootmem_init(void)
sparse_init();
zone_sizes_init(min, max);
/*
* Reserve the CMA area after arm64_dma_phys_limit was initialised.
*/
dma_contiguous_reserve(arm64_dma_phys_limit);
/*
* request_standard_resources() depends on crashkernel's memory being
* reserved, so do it here.
@ -455,7 +458,7 @@ void __init bootmem_init(void)
void __init mem_init(void)
{
if (swiotlb_force == SWIOTLB_FORCE ||
max_pfn > PFN_DOWN(arm64_dma_phys_limit ? : arm64_dma32_phys_limit))
max_pfn > PFN_DOWN(arm64_dma_phys_limit))
swiotlb_init(1);
else
swiotlb_force = SWIOTLB_NO_FORCE;