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authorIngo Molnar <mingo@kernel.org>2017-12-17 13:09:31 +0100
committerIngo Molnar <mingo@kernel.org>2017-12-17 13:09:31 +0100
commit2ec077c186a02c0aae8fc213a7b1d4c35f9626ed (patch)
treebc78c495a2031a76d6356135dda2020d4e0f77f8
parent650400b2ccb8542ff4e2677d66ff083d01c7bd6a (diff)
parent4f89fa286f6729312e227e7c2d764e8e7b9d340e (diff)
downloadlinux-sh-2ec077c186a02c0aae8fc213a7b1d4c35f9626ed.tar.gz
Merge branch 'upstream-acpi-fixes' into WIP.x86/pti.base
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/arm64/include/asm/fixmap.h7
-rw-r--r--arch/x86/include/asm/fixmap.h6
-rw-r--r--drivers/acpi/apei/ghes.c78
3 files changed, 33 insertions, 58 deletions
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
index caf86be815ba..4052ec39e8db 100644
--- a/arch/arm64/include/asm/fixmap.h
+++ b/arch/arm64/include/asm/fixmap.h
@@ -51,6 +51,13 @@ enum fixed_addresses {
FIX_EARLYCON_MEM_BASE,
FIX_TEXT_POKE0,
+
+#ifdef CONFIG_ACPI_APEI_GHES
+ /* Used for GHES mapping from assorted contexts */
+ FIX_APEI_GHES_IRQ,
+ FIX_APEI_GHES_NMI,
+#endif /* CONFIG_ACPI_APEI_GHES */
+
__end_of_permanent_fixed_addresses,
/*
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index dcd9fb55e679..b0c505fe9a95 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -104,6 +104,12 @@ enum fixed_addresses {
FIX_GDT_REMAP_BEGIN,
FIX_GDT_REMAP_END = FIX_GDT_REMAP_BEGIN + NR_CPUS - 1,
+#ifdef CONFIG_ACPI_APEI_GHES
+ /* Used for GHES mapping from assorted contexts */
+ FIX_APEI_GHES_IRQ,
+ FIX_APEI_GHES_NMI,
+#endif
+
__end_of_permanent_fixed_addresses,
/*
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 3c3a37b8503b..572b6c7303ed 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -51,6 +51,7 @@
#include <acpi/actbl1.h>
#include <acpi/ghes.h>
#include <acpi/apei.h>
+#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <ras/ras_event.h>
@@ -112,7 +113,7 @@ static DEFINE_MUTEX(ghes_list_mutex);
* Because the memory area used to transfer hardware error information
* from BIOS to Linux can be determined only in NMI, IRQ or timer
* handler, but general ioremap can not be used in atomic context, so
- * a special version of atomic ioremap is implemented for that.
+ * the fixmap is used instead.
*/
/*
@@ -126,8 +127,8 @@ static DEFINE_MUTEX(ghes_list_mutex);
/* virtual memory area for atomic ioremap */
static struct vm_struct *ghes_ioremap_area;
/*
- * These 2 spinlock is used to prevent atomic ioremap virtual memory
- * area from being mapped simultaneously.
+ * These 2 spinlocks are used to prevent the fixmap entries from being used
+ * simultaneously.
*/
static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi);
static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);
@@ -159,52 +160,36 @@ static void ghes_ioremap_exit(void)
static void __iomem *ghes_ioremap_pfn_nmi(u64 pfn)
{
- unsigned long vaddr;
phys_addr_t paddr;
pgprot_t prot;
- vaddr = (unsigned long)GHES_IOREMAP_NMI_PAGE(ghes_ioremap_area->addr);
-
paddr = pfn << PAGE_SHIFT;
prot = arch_apei_get_mem_attribute(paddr);
- ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
+ __set_fixmap(FIX_APEI_GHES_NMI, paddr, prot);
- return (void __iomem *)vaddr;
+ return (void __iomem *) fix_to_virt(FIX_APEI_GHES_NMI);
}
static void __iomem *ghes_ioremap_pfn_irq(u64 pfn)
{
- unsigned long vaddr, paddr;
+ phys_addr_t paddr;
pgprot_t prot;
- vaddr = (unsigned long)GHES_IOREMAP_IRQ_PAGE(ghes_ioremap_area->addr);
-
paddr = pfn << PAGE_SHIFT;
prot = arch_apei_get_mem_attribute(paddr);
+ __set_fixmap(FIX_APEI_GHES_IRQ, paddr, prot);
- ioremap_page_range(vaddr, vaddr + PAGE_SIZE, paddr, prot);
-
- return (void __iomem *)vaddr;
+ return (void __iomem *) fix_to_virt(FIX_APEI_GHES_IRQ);
}
-static void ghes_iounmap_nmi(void __iomem *vaddr_ptr)
+static void ghes_iounmap_nmi(void)
{
- unsigned long vaddr = (unsigned long __force)vaddr_ptr;
- void *base = ghes_ioremap_area->addr;
-
- BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_NMI_PAGE(base));
- unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
- arch_apei_flush_tlb_one(vaddr);
+ clear_fixmap(FIX_APEI_GHES_NMI);
}
-static void ghes_iounmap_irq(void __iomem *vaddr_ptr)
+static void ghes_iounmap_irq(void)
{
- unsigned long vaddr = (unsigned long __force)vaddr_ptr;
- void *base = ghes_ioremap_area->addr;
-
- BUG_ON(vaddr != (unsigned long)GHES_IOREMAP_IRQ_PAGE(base));
- unmap_kernel_range_noflush(vaddr, PAGE_SIZE);
- arch_apei_flush_tlb_one(vaddr);
+ clear_fixmap(FIX_APEI_GHES_IRQ);
}
static int ghes_estatus_pool_init(void)
@@ -360,10 +345,10 @@ static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
paddr += trunk;
buffer += trunk;
if (in_nmi) {
- ghes_iounmap_nmi(vaddr);
+ ghes_iounmap_nmi();
raw_spin_unlock(&ghes_ioremap_lock_nmi);
} else {
- ghes_iounmap_irq(vaddr);
+ ghes_iounmap_irq();
spin_unlock_irqrestore(&ghes_ioremap_lock_irq, flags);
}
}
@@ -851,17 +836,8 @@ static void ghes_sea_remove(struct ghes *ghes)
synchronize_rcu();
}
#else /* CONFIG_ACPI_APEI_SEA */
-static inline void ghes_sea_add(struct ghes *ghes)
-{
- pr_err(GHES_PFX "ID: %d, trying to add SEA notification which is not supported\n",
- ghes->generic->header.source_id);
-}
-
-static inline void ghes_sea_remove(struct ghes *ghes)
-{
- pr_err(GHES_PFX "ID: %d, trying to remove SEA notification which is not supported\n",
- ghes->generic->header.source_id);
-}
+static inline void ghes_sea_add(struct ghes *ghes) { }
+static inline void ghes_sea_remove(struct ghes *ghes) { }
#endif /* CONFIG_ACPI_APEI_SEA */
#ifdef CONFIG_HAVE_ACPI_APEI_NMI
@@ -1063,23 +1039,9 @@ static void ghes_nmi_init_cxt(void)
init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
}
#else /* CONFIG_HAVE_ACPI_APEI_NMI */
-static inline void ghes_nmi_add(struct ghes *ghes)
-{
- pr_err(GHES_PFX "ID: %d, trying to add NMI notification which is not supported!\n",
- ghes->generic->header.source_id);
- BUG();
-}
-
-static inline void ghes_nmi_remove(struct ghes *ghes)
-{
- pr_err(GHES_PFX "ID: %d, trying to remove NMI notification which is not supported!\n",
- ghes->generic->header.source_id);
- BUG();
-}
-
-static inline void ghes_nmi_init_cxt(void)
-{
-}
+static inline void ghes_nmi_add(struct ghes *ghes) { }
+static inline void ghes_nmi_remove(struct ghes *ghes) { }
+static inline void ghes_nmi_init_cxt(void) { }
#endif /* CONFIG_HAVE_ACPI_APEI_NMI */
static int ghes_probe(struct platform_device *ghes_dev)