Revision 7f378c03aa4952507521174fb0da7b24a9ad0be6 authored by Felix Riemann on 18 October 2022, 10:47:54 UTC, committed by Jakub Kicinski on 20 October 2022, 01:46:17 UTC
If the cable is disconnected the PHY seems to toggle between MDI and MDI-X modes. With the MDI crossover status interrupt active this causes roughly 10 interrupts per second. As the crossover status isn't checked by the driver, the interrupt can be disabled to reduce the interrupt load. Fixes: 87461f7a58ab ("net: phy: DP83822 initial driver submission") Signed-off-by: Felix Riemann <felix.riemann@sma.de> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20221018104755.30025-1-svc.sw.rte.linux@sma.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent ebda44d
mem.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PowerPC version
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
* PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*/
#include <linux/memblock.h>
#include <linux/highmem.h>
#include <linux/suspend.h>
#include <linux/dma-direct.h>
#include <asm/swiotlb.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/kasan.h>
#include <asm/svm.h>
#include <asm/mmzone.h>
#include <asm/ftrace.h>
#include <asm/code-patching.h>
#include <asm/setup.h>
#include <mm/mmu_decl.h>
unsigned long long memory_limit;
unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t vma_prot)
{
if (ppc_md.phys_mem_access_prot)
return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
if (!page_is_ram(pfn))
vma_prot = pgprot_noncached(vma_prot);
return vma_prot;
}
EXPORT_SYMBOL(phys_mem_access_prot);
#ifdef CONFIG_MEMORY_HOTPLUG
static DEFINE_MUTEX(linear_mapping_mutex);
#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 start)
{
return hot_add_scn_to_nid(start);
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
int __weak create_section_mapping(unsigned long start, unsigned long end,
int nid, pgprot_t prot)
{
return -ENODEV;
}
int __weak remove_section_mapping(unsigned long start, unsigned long end)
{
return -ENODEV;
}
int __ref arch_create_linear_mapping(int nid, u64 start, u64 size,
struct mhp_params *params)
{
int rc;
start = (unsigned long)__va(start);
mutex_lock(&linear_mapping_mutex);
rc = create_section_mapping(start, start + size, nid,
params->pgprot);
mutex_unlock(&linear_mapping_mutex);
if (rc) {
pr_warn("Unable to create linear mapping for 0x%llx..0x%llx: %d\n",
start, start + size, rc);
return -EFAULT;
}
return 0;
}
void __ref arch_remove_linear_mapping(u64 start, u64 size)
{
int ret;
/* Remove htab bolted mappings for this section of memory */
start = (unsigned long)__va(start);
mutex_lock(&linear_mapping_mutex);
ret = remove_section_mapping(start, start + size);
mutex_unlock(&linear_mapping_mutex);
if (ret)
pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n",
start, start + size, ret);
/* Ensure all vmalloc mappings are flushed in case they also
* hit that section of memory
*/
vm_unmap_aliases();
}
/*
* After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
* updating.
*/
static void update_end_of_memory_vars(u64 start, u64 size)
{
unsigned long end_pfn = PFN_UP(start + size);
if (end_pfn > max_pfn) {
max_pfn = end_pfn;
max_low_pfn = end_pfn;
high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
}
}
int __ref add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
struct mhp_params *params)
{
int ret;
ret = __add_pages(nid, start_pfn, nr_pages, params);
if (ret)
return ret;
/* update max_pfn, max_low_pfn and high_memory */
update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
nr_pages << PAGE_SHIFT);
return ret;
}
int __ref arch_add_memory(int nid, u64 start, u64 size,
struct mhp_params *params)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int rc;
rc = arch_create_linear_mapping(nid, start, size, params);
if (rc)
return rc;
rc = add_pages(nid, start_pfn, nr_pages, params);
if (rc)
arch_remove_linear_mapping(start, size);
return rc;
}
void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
__remove_pages(start_pfn, nr_pages, altmap);
arch_remove_linear_mapping(start, size);
}
#endif
#ifndef CONFIG_NUMA
void __init mem_topology_setup(void)
{
max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
min_low_pfn = MEMORY_START >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
#endif
/* Place all memblock_regions in the same node and merge contiguous
* memblock_regions
*/
memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
}
void __init initmem_init(void)
{
sparse_init();
}
/* mark pages that don't exist as nosave */
static int __init mark_nonram_nosave(void)
{
unsigned long spfn, epfn, prev = 0;
int i;
for_each_mem_pfn_range(i, MAX_NUMNODES, &spfn, &epfn, NULL) {
if (prev && prev < spfn)
register_nosave_region(prev, spfn);
prev = epfn;
}
return 0;
}
#else /* CONFIG_NUMA */
static int __init mark_nonram_nosave(void)
{
return 0;
}
#endif
/*
* Zones usage:
*
* We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
* everything else. GFP_DMA32 page allocations automatically fall back to
* 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];
/*
* paging_init() sets up the page tables - in fact we've already done this.
*/
void __init paging_init(void)
{
unsigned long long total_ram = memblock_phys_mem_size();
phys_addr_t top_of_ram = memblock_end_of_DRAM();
#ifdef CONFIG_HIGHMEM
unsigned long v = __fix_to_virt(FIX_KMAP_END);
unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);
for (; v < end; v += PAGE_SIZE)
map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
pkmap_page_table = virt_to_kpte(PKMAP_BASE);
#endif /* CONFIG_HIGHMEM */
printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
(unsigned long long)top_of_ram, total_ram);
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 << (zone_dma_bits - PAGE_SHIFT));
#endif
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
#ifdef CONFIG_HIGHMEM
max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
#endif
free_area_init(max_zone_pfns);
mark_nonram_nosave();
}
void __init mem_init(void)
{
/*
* book3s is limited to 16 page sizes due to encoding this in
* a 4-bit field for slices.
*/
BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
#ifdef CONFIG_SWIOTLB
/*
* Some platforms (e.g. 85xx) limit DMA-able memory way below
* 4G. We force memblock to bottom-up mode to ensure that the
* memory allocated in swiotlb_init() is DMA-able.
* As it's the last memblock allocation, no need to reset it
* back to to-down.
*/
memblock_set_bottom_up(true);
swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
#endif
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
set_max_mapnr(max_pfn);
kasan_late_init();
memblock_free_all();
#ifdef CONFIG_HIGHMEM
{
unsigned long pfn, highmem_mapnr;
highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
struct page *page = pfn_to_page(pfn);
if (memblock_is_memory(paddr) && !memblock_is_reserved(paddr))
free_highmem_page(page);
}
}
#endif /* CONFIG_HIGHMEM */
#if defined(CONFIG_PPC_E500) && !defined(CONFIG_SMP)
/*
* If smp is enabled, next_tlbcam_idx is initialized in the cpu up
* functions.... do it here for the non-smp case.
*/
per_cpu(next_tlbcam_idx, smp_processor_id()) =
(mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
#endif
#ifdef CONFIG_PPC32
pr_info("Kernel virtual memory layout:\n");
#ifdef CONFIG_KASAN
pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
KASAN_SHADOW_START, KASAN_SHADOW_END);
#endif
pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
#ifdef CONFIG_HIGHMEM
pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
#endif /* CONFIG_HIGHMEM */
if (ioremap_bot != IOREMAP_TOP)
pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
ioremap_bot, IOREMAP_TOP);
pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
VMALLOC_START, VMALLOC_END);
#ifdef MODULES_VADDR
pr_info(" * 0x%08lx..0x%08lx : modules\n",
MODULES_VADDR, MODULES_END);
#endif
#endif /* CONFIG_PPC32 */
}
void free_initmem(void)
{
ppc_md.progress = ppc_printk_progress;
mark_initmem_nx();
static_branch_enable(&init_mem_is_free);
free_initmem_default(POISON_FREE_INITMEM);
ftrace_free_init_tramp();
}
/*
* System memory should not be in /proc/iomem but various tools expect it
* (eg kdump).
*/
static int __init add_system_ram_resources(void)
{
phys_addr_t start, end;
u64 i;
for_each_mem_range(i, &start, &end) {
struct resource *res;
res = kzalloc(sizeof(struct resource), GFP_KERNEL);
WARN_ON(!res);
if (res) {
res->name = "System RAM";
res->start = start;
/*
* In memblock, end points to the first byte after
* the range while in resourses, end points to the
* last byte in the range.
*/
res->end = end - 1;
res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
WARN_ON(request_resource(&iomem_resource, res) < 0);
}
}
return 0;
}
subsys_initcall(add_system_ram_resources);
#ifdef CONFIG_STRICT_DEVMEM
/*
* devmem_is_allowed(): check to see if /dev/mem access to a certain address
* is valid. The argument is a physical page number.
*
* Access has to be given to non-kernel-ram areas as well, these contain the
* PCI mmio resources as well as potential bios/acpi data regions.
*/
int devmem_is_allowed(unsigned long pfn)
{
if (page_is_rtas_user_buf(pfn))
return 1;
if (iomem_is_exclusive(PFN_PHYS(pfn)))
return 0;
if (!page_is_ram(pfn))
return 1;
return 0;
}
#endif /* CONFIG_STRICT_DEVMEM */
/*
* This is defined in kernel/resource.c but only powerpc needs to export it, for
* the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
*/
EXPORT_SYMBOL_GPL(walk_system_ram_range);
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