From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/arch/x86/mm/iomap_32.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 54 insertions(+), 3 deletions(-)
diff --git a/kernel/arch/x86/mm/iomap_32.c b/kernel/arch/x86/mm/iomap_32.c
index 9aaa756..f60398a 100644
--- a/kernel/arch/x86/mm/iomap_32.c
+++ b/kernel/arch/x86/mm/iomap_32.c
@@ -44,7 +44,28 @@
}
EXPORT_SYMBOL_GPL(iomap_free);
-void __iomem *__iomap_local_pfn_prot(unsigned long pfn, pgprot_t prot)
+void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
+{
+ unsigned long vaddr;
+ int idx, type;
+
+ preempt_disable();
+ pagefault_disable();
+
+ type = kmap_atomic_idx_push();
+ idx = type + KM_TYPE_NR * smp_processor_id();
+ vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
+ set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
+ arch_flush_lazy_mmu_mode();
+
+ return (void *)vaddr;
+}
+
+/*
+ * Map 'pfn' using protections 'prot'
+ */
+void __iomem *
+iomap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
{
/*
* For non-PAT systems, translate non-WB request to UC- just in
@@ -60,6 +81,36 @@
/* Filter out unsupported __PAGE_KERNEL* bits: */
pgprot_val(prot) &= __default_kernel_pte_mask;
- return (void __force __iomem *)__kmap_local_pfn_prot(pfn, prot);
+ return (void __force __iomem *) kmap_atomic_prot_pfn(pfn, prot);
}
-EXPORT_SYMBOL_GPL(__iomap_local_pfn_prot);
+EXPORT_SYMBOL_GPL(iomap_atomic_prot_pfn);
+
+void
+iounmap_atomic(void __iomem *kvaddr)
+{
+ unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
+
+ if (vaddr >= __fix_to_virt(FIX_KMAP_END) &&
+ vaddr <= __fix_to_virt(FIX_KMAP_BEGIN)) {
+ int idx, type;
+
+ type = kmap_atomic_idx();
+ idx = type + KM_TYPE_NR * smp_processor_id();
+
+#ifdef CONFIG_DEBUG_HIGHMEM
+ WARN_ON_ONCE(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
+#endif
+ /*
+ * Force other mappings to Oops if they'll try to access this
+ * pte without first remap it. Keeping stale mappings around
+ * is a bad idea also, in case the page changes cacheability
+ * attributes or becomes a protected page in a hypervisor.
+ */
+ kpte_clear_flush(kmap_pte-idx, vaddr);
+ kmap_atomic_idx_pop();
+ }
+
+ pagefault_enable();
+ preempt_enable();
+}
+EXPORT_SYMBOL_GPL(iounmap_atomic);
--
Gitblit v1.6.2