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-rw-r--r--arch/ia64/kernel/efi.c156
-rw-r--r--arch/ia64/mm/ioremap.c27
-rw-r--r--arch/ia64/pci/pci.c17
3 files changed, 139 insertions, 61 deletions
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 12cfedce73b..c33d0ba7e30 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -8,6 +8,8 @@
* Copyright (C) 1999-2003 Hewlett-Packard Co.
* David Mosberger-Tang <davidm@hpl.hp.com>
* Stephane Eranian <eranian@hpl.hp.com>
+ * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
*
* All EFI Runtime Services are not implemented yet as EFI only
* supports physical mode addressing on SoftSDV. This is to be fixed
@@ -622,28 +624,20 @@ efi_get_iobase (void)
return 0;
}
-static efi_memory_desc_t *
-efi_memory_descriptor (unsigned long phys_addr)
+static struct kern_memdesc *
+kern_memory_descriptor (unsigned long phys_addr)
{
- void *efi_map_start, *efi_map_end, *p;
- efi_memory_desc_t *md;
- u64 efi_desc_size;
-
- efi_map_start = __va(ia64_boot_param->efi_memmap);
- efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size;
- efi_desc_size = ia64_boot_param->efi_memdesc_size;
+ struct kern_memdesc *md;
- for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
- md = p;
-
- if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
+ for (md = kern_memmap; md->start != ~0UL; md++) {
+ if (phys_addr - md->start < (md->num_pages << EFI_PAGE_SHIFT))
return md;
}
return 0;
}
-static int
-efi_memmap_has_mmio (void)
+static efi_memory_desc_t *
+efi_memory_descriptor (unsigned long phys_addr)
{
void *efi_map_start, *efi_map_end, *p;
efi_memory_desc_t *md;
@@ -656,8 +650,8 @@ efi_memmap_has_mmio (void)
for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
md = p;
- if (md->type == EFI_MEMORY_MAPPED_IO)
- return 1;
+ if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
+ return md;
}
return 0;
}
@@ -683,71 +677,125 @@ efi_mem_attributes (unsigned long phys_addr)
}
EXPORT_SYMBOL(efi_mem_attributes);
-/*
- * Determines whether the memory at phys_addr supports the desired
- * attribute (WB, UC, etc). If this returns 1, the caller can safely
- * access size bytes at phys_addr with the specified attribute.
- */
-int
-efi_mem_attribute_range (unsigned long phys_addr, unsigned long size, u64 attr)
+u64
+efi_mem_attribute (unsigned long phys_addr, unsigned long size)
{
unsigned long end = phys_addr + size;
efi_memory_desc_t *md = efi_memory_descriptor(phys_addr);
+ u64 attr;
+
+ if (!md)
+ return 0;
+
+ /*
+ * EFI_MEMORY_RUNTIME is not a memory attribute; it just tells
+ * the kernel that firmware needs this region mapped.
+ */
+ attr = md->attribute & ~EFI_MEMORY_RUNTIME;
+ do {
+ unsigned long md_end = efi_md_end(md);
+
+ if (end <= md_end)
+ return attr;
+
+ md = efi_memory_descriptor(md_end);
+ if (!md || (md->attribute & ~EFI_MEMORY_RUNTIME) != attr)
+ return 0;
+ } while (md);
+ return 0;
+}
+
+u64
+kern_mem_attribute (unsigned long phys_addr, unsigned long size)
+{
+ unsigned long end = phys_addr + size;
+ struct kern_memdesc *md;
+ u64 attr;
/*
- * Some firmware doesn't report MMIO regions in the EFI memory
- * map. The Intel BigSur (a.k.a. HP i2000) has this problem.
- * On those platforms, we have to assume UC is valid everywhere.
+ * This is a hack for ioremap calls before we set up kern_memmap.
+ * Maybe we should do efi_memmap_init() earlier instead.
*/
- if (!md || (md->attribute & attr) != attr) {
- if (attr == EFI_MEMORY_UC && !efi_memmap_has_mmio())
- return 1;
+ if (!kern_memmap) {
+ attr = efi_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB)
+ return EFI_MEMORY_WB;
return 0;
}
+ md = kern_memory_descriptor(phys_addr);
+ if (!md)
+ return 0;
+
+ attr = md->attribute;
do {
- unsigned long md_end = efi_md_end(md);
+ unsigned long md_end = kmd_end(md);
if (end <= md_end)
- return 1;
+ return attr;
- md = efi_memory_descriptor(md_end);
- if (!md || (md->attribute & attr) != attr)
+ md = kern_memory_descriptor(md_end);
+ if (!md || md->attribute != attr)
return 0;
} while (md);
return 0;
}
+EXPORT_SYMBOL(kern_mem_attribute);
-/*
- * For /dev/mem, we only allow read & write system calls to access
- * write-back memory, because read & write don't allow the user to
- * control access size.
- */
int
valid_phys_addr_range (unsigned long phys_addr, unsigned long size)
{
- return efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB);
+ u64 attr;
+
+ /*
+ * /dev/mem reads and writes use copy_to_user(), which implicitly
+ * uses a granule-sized kernel identity mapping. It's really
+ * only safe to do this for regions in kern_memmap. For more
+ * details, see Documentation/ia64/aliasing.txt.
+ */
+ attr = kern_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB || attr & EFI_MEMORY_UC)
+ return 1;
+ return 0;
}
-/*
- * We allow mmap of anything in the EFI memory map that supports
- * either write-back or uncacheable access. For uncacheable regions,
- * the supported access sizes are system-dependent, and the user is
- * responsible for using the correct size.
- *
- * Note that this doesn't currently allow access to hot-added memory,
- * because that doesn't appear in the boot-time EFI memory map.
- */
int
valid_mmap_phys_addr_range (unsigned long phys_addr, unsigned long size)
{
- if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_WB))
- return 1;
+ /*
+ * MMIO regions are often missing from the EFI memory map.
+ * We must allow mmap of them for programs like X, so we
+ * currently can't do any useful validation.
+ */
+ return 1;
+}
- if (efi_mem_attribute_range(phys_addr, size, EFI_MEMORY_UC))
- return 1;
+pgprot_t
+phys_mem_access_prot(struct file *file, unsigned long pfn, unsigned long size,
+ pgprot_t vma_prot)
+{
+ unsigned long phys_addr = pfn << PAGE_SHIFT;
+ u64 attr;
- return 0;
+ /*
+ * For /dev/mem mmap, we use user mappings, but if the region is
+ * in kern_memmap (and hence may be covered by a kernel mapping),
+ * we must use the same attribute as the kernel mapping.
+ */
+ attr = kern_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB)
+ return pgprot_cacheable(vma_prot);
+ else if (attr & EFI_MEMORY_UC)
+ return pgprot_noncached(vma_prot);
+
+ /*
+ * Some chipsets don't support UC access to memory. If
+ * WB is supported, we prefer that.
+ */
+ if (efi_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
+ return pgprot_cacheable(vma_prot);
+
+ return pgprot_noncached(vma_prot);
}
int __init
diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c
index 643ccc6960c..07bd02b6c37 100644
--- a/arch/ia64/mm/ioremap.c
+++ b/arch/ia64/mm/ioremap.c
@@ -11,6 +11,7 @@
#include <linux/module.h>
#include <linux/efi.h>
#include <asm/io.h>
+#include <asm/meminit.h>
static inline void __iomem *
__ioremap (unsigned long offset, unsigned long size)
@@ -21,16 +22,29 @@ __ioremap (unsigned long offset, unsigned long size)
void __iomem *
ioremap (unsigned long offset, unsigned long size)
{
- if (efi_mem_attribute_range(offset, size, EFI_MEMORY_WB))
- return phys_to_virt(offset);
+ u64 attr;
+ unsigned long gran_base, gran_size;
- if (efi_mem_attribute_range(offset, size, EFI_MEMORY_UC))
+ /*
+ * For things in kern_memmap, we must use the same attribute
+ * as the rest of the kernel. For more details, see
+ * Documentation/ia64/aliasing.txt.
+ */
+ attr = kern_mem_attribute(offset, size);
+ if (attr & EFI_MEMORY_WB)
+ return phys_to_virt(offset);
+ else if (attr & EFI_MEMORY_UC)
return __ioremap(offset, size);
/*
- * Someday this should check ACPI resources so we
- * can do the right thing for hot-plugged regions.
+ * Some chipsets don't support UC access to memory. If
+ * WB is supported for the whole granule, we prefer that.
*/
+ gran_base = GRANULEROUNDDOWN(offset);
+ gran_size = GRANULEROUNDUP(offset + size) - gran_base;
+ if (efi_mem_attribute(gran_base, gran_size) & EFI_MEMORY_WB)
+ return phys_to_virt(offset);
+
return __ioremap(offset, size);
}
EXPORT_SYMBOL(ioremap);
@@ -38,6 +52,9 @@ EXPORT_SYMBOL(ioremap);
void __iomem *
ioremap_nocache (unsigned long offset, unsigned long size)
{
+ if (kern_mem_attribute(offset, size) & EFI_MEMORY_WB)
+ return 0;
+
return __ioremap(offset, size);
}
EXPORT_SYMBOL(ioremap_nocache);
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index ab829a22f8a..30d148f3404 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -645,18 +645,31 @@ char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
int
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
{
+ unsigned long size = vma->vm_end - vma->vm_start;
+ pgprot_t prot;
char *addr;
+ /*
+ * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
+ * for more details.
+ */
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
+ return -EINVAL;
+ prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
+ vma->vm_page_prot);
+ if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot)))
+ return -EINVAL;
+
addr = pci_get_legacy_mem(bus);
if (IS_ERR(addr))
return PTR_ERR(addr);
vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_page_prot = prot;
vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start, vma->vm_page_prot))
+ size, vma->vm_page_prot))
return -EAGAIN;
return 0;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-16 00:24:20 +0000