| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20220801144029.57829-8-bhe@redhat.com>
Date: Mon, 1 Aug 2022 22:40:25 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, hch@...radead.org,
wangkefeng.wang@...wei.com, linux-arm-kernel@...ts.infradead.org,
Baoquan He <bhe@...hat.com>, Jonas Bonn <jonas@...thpole.se>,
Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
Stafford Horne <shorne@...il.com>,
openrisc@...ts.librecores.org
Subject: [PATCH 07/11] openrisc: mm: Convert to GENERIC_IOREMAP
Add hooks ioremap_allowed() and iounmap_allowed() for operisc's special
operation when ioremap() and iounmap.
Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: Jonas Bonn <jonas@...thpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
Cc: Stafford Horne <shorne@...il.com>
Cc: openrisc@...ts.librecores.org
---
arch/openrisc/Kconfig | 1 +
arch/openrisc/include/asm/io.h | 16 ++++++++---
arch/openrisc/mm/ioremap.c | 49 +++++++++++-----------------------
3 files changed, 28 insertions(+), 38 deletions(-)
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index e814df4c483c..77505f2a2767 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -21,6 +21,7 @@ config OPENRISC
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select GENERIC_IOMAP
+ select GENERIC_IOREMAP
select GENERIC_CPU_DEVICES
select HAVE_UID16
select GENERIC_ATOMIC64
diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h
index c298061c70a7..8948df501464 100644
--- a/arch/openrisc/include/asm/io.h
+++ b/arch/openrisc/include/asm/io.h
@@ -15,6 +15,8 @@
#define __ASM_OPENRISC_IO_H
#include <linux/types.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
/*
* PCI: can we really do 0 here if we have no port IO?
@@ -27,11 +29,17 @@
#define PIO_OFFSET 0
#define PIO_MASK 0
-#define ioremap ioremap
-void __iomem *ioremap(phys_addr_t offset, unsigned long size);
+/*
+ * I/O memory mapping functions.
+ */
+void __iomem *
+ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
+#define ioremap_allowed ioremap_allowed
+
+int iounmap_allowed(void *addr);
+#define iounmap_allowed iounmap_allowed
-#define iounmap iounmap
-extern void iounmap(void __iomem *addr);
+#define _PAGE_IOREMAP (pgprot_val(PAGE_KERNEL) | _PAGE_CI)
#include <asm-generic/io.h>
diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
index daae13a76743..d30b6cc65548 100644
--- a/arch/openrisc/mm/ioremap.c
+++ b/arch/openrisc/mm/ioremap.c
@@ -24,26 +24,18 @@ extern int mem_init_done;
static unsigned int fixmaps_used __initdata;
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- *
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
- * have to convert them into an offset in a page-aligned mapping, but the
- * caller shouldn't need to know that small detail.
- */
-void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
+void __iomem *
+ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
{
phys_addr_t p;
unsigned long v;
unsigned long offset, last_addr;
- struct vm_struct *area = NULL;
+ int ret = -EINVAL;
/* Don't allow wraparound or zero size */
last_addr = addr + size - 1;
if (!size || last_addr < addr)
- return NULL;
+ return IOMEM_ERR_PTR(ret);
/*
* Mappings have to be page-aligned
@@ -52,32 +44,24 @@ void __iomem *__ref ioremap(phys_addr_t addr, unsigned long size)
p = addr & PAGE_MASK;
size = PAGE_ALIGN(last_addr + 1) - p;
- if (likely(mem_init_done)) {
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
- v = (unsigned long)area->addr;
- } else {
+ if (unlikely(!mem_init_done)) {
if ((fixmaps_used + (size >> PAGE_SHIFT)) > FIX_N_IOREMAPS)
- return NULL;
+ return IOMEM_ERR_PTR(ret);
v = fix_to_virt(FIX_IOREMAP_BEGIN + fixmaps_used);
fixmaps_used += (size >> PAGE_SHIFT);
- }
- if (ioremap_page_range(v, v + size, p,
- __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_CI))) {
- if (likely(mem_init_done))
- vfree(area->addr);
- else
+ if (ioremap_page_range(v, v + size, p, __pgprot(*prot_val))) {
fixmaps_used -= (size >> PAGE_SHIFT);
- return NULL;
+ return IOMEM_ERR_PTR(ret);
+ }
+
+ return (void __iomem *)(offset + (char *)v);
}
- return (void __iomem *)(offset + (char *)v);
+ return NULL;
}
-EXPORT_SYMBOL(ioremap);
-void iounmap(void __iomem *addr)
+int iounmap_allowed(void __iomem *addr)
{
/* If the page is from the fixmap pool then we just clear out
* the fixmap mapping.
@@ -97,13 +81,10 @@ void iounmap(void __iomem *addr)
* ii) invalid accesses to the freed areas aren't made
*/
flush_tlb_all();
- return;
+ return -EINVAL;
}
-
- return vfree((void *)(PAGE_MASK & (unsigned long)addr));
+ return 0;
}
-EXPORT_SYMBOL(iounmap);
-
/**
* OK, this one's a bit tricky... ioremap can get called before memory is
* initialized (early serial console does this) and will want to alloc a page
--
2.34.1
Powered by blists - more mailing lists