diff -ru usr/src/nv/Makefile.kbuild usr/src/nv.2286310/Makefile.kbuild
--- usr/src/nv/Makefile.kbuild 2008-03-16 14:13:10.000000000 -0700
+++ usr/src/nv.2286310/Makefile.kbuild 2008-03-16 14:37:47.204131496 -0700
@@ -177,6 +177,7 @@
vmap \
signal_struct \
agp_backend_acquire \
+ set_pages_uc \
change_page_attr \
pci_get_class \
sysctl_max_map_count \
diff -ru usr/src/nv/conftest.sh usr/src/nv.2286310/conftest.sh
--- usr/src/nv/conftest.sh 2008-03-16 14:13:10.000000000 -0700
+++ usr/src/nv.2286310/conftest.sh 2008-03-16 14:37:47.204131496 -0700
@@ -100,6 +100,32 @@
fi
;;
+ set_pages_uc)
+ #
+ # Determine if the set_pages_uc() function is present.
+ #
+ echo "#include <linux/autoconf.h>
+ #include <asm/cacheflush.h>
+ void conftest_set_pages_uc(void) {
+ set_pages_uc();
+ }" > conftest$$.c
+
+ $CC $CFLAGS -c conftest$$.c > /dev/null 2>&1
+ rm -f conftest$$.c
+
+ if [ -f conftest$$.o ]; then
+ rm -f conftest$$.o
+ echo "#undef NV_SET_PAGES_UC_PRESENT" >> conftest.h
+ return
+ else
+ echo "#ifdef NV_CHANGE_PAGE_ATTR_PRESENT" >> conftest.h
+ echo "#undef NV_CHANGE_PAGE_ATTR_PRESENT" >> conftest.h
+ echo "#endif" >> conftest.h
+ echo "#define NV_SET_PAGES_UC_PRESENT" >> conftest.h
+ return
+ fi
+ ;;
+
change_page_attr)
#
# Determine if the change_page_attr() function is
@@ -124,7 +150,9 @@
rm -f conftest$$.o
return
else
+ echo "#ifndef NV_SET_PAGES_UC_PRESENT" >> conftest.h
echo "#define NV_CHANGE_PAGE_ATTR_PRESENT" >> conftest.h
+ echo "#endif" >> conftest.h
return
fi
;;
@@ -524,6 +552,8 @@
return
fi
+ rm -f conftest$$.o
+
echo "#include <linux/autoconf.h>
#include <linux/interrupt.h>
irq_handler_t conftest_isr;
diff -ru usr/src/nv/nv-linux.h usr/src/nv.2286310/nv-linux.h
--- usr/src/nv/nv-linux.h 2008-03-16 14:13:10.000000000 -0700
+++ usr/src/nv.2286310/nv-linux.h 2008-03-16 14:37:47.204131496 -0700
@@ -871,9 +871,10 @@
#define NV_PGD_OFFSET(address, kernel, mm) \
({ \
+ struct mm_struct *__mm = (mm); \
pgd_t *__pgd; \
if (!kernel) \
- __pgd = pgd_offset(mm, address); \
+ __pgd = pgd_offset(__mm, address); \
else \
__pgd = pgd_offset_k(address); \
__pgd; \
@@ -1208,21 +1209,24 @@
nv_check_pci_config_space(nv, cb); \
}
+extern int nv_update_memory_types;
+
/*
- * a BUG() is triggered on early 2.6 x86_64 kernels. the underlying
- * problem actually exists on many architectures and kernels, but
- * these are the only kernels that check the condition and trigger
- * a BUG(). note that this is a problem of the core kernel, not an
- * nvidia bug (and can still be triggered by agpgart). let's avoid
- * change_page_attr on those kernels.
+ * Using change_page_attr() on early Linux/x86-64 2.6 kernels may
+ * result in a BUG() being triggered. The underlying problem
+ * actually exists on multiple architectures and kernels, but only
+ * the above check for the condition and trigger a BUG().
+ *
+ * Note that this is a due to a bug in the Linux kernel, not an
+ * NVIDIA driver bug (it can also be triggered by AGPGART).
+ *
+ * We therefore need to determine at runtime if change_page_attr()
+ * can be used safely on these kernels.
*/
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
-extern int nv_use_cpa;
-
-#if defined(NVCPU_X86_64) && !defined(KERNEL_2_4) && \
- (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 11))
-#define NV_CHANGE_PAGE_ATTR_BUG_PRESENT 1
-#endif
+#if defined(NV_CHANGE_PAGE_ATTR_PRESENT) && defined(NVCPU_X86_64) && \
+ !defined(KERNEL_2_4) && \
+ (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 11))
+#define NV_CHANGE_PAGE_ATTR_BUG_PRESENT
#endif
#if defined(NVCPU_X86) || defined(NVCPU_X86_64)
@@ -1234,7 +1238,7 @@
*
* We need to be careful to mask out _PAGE_NX when the host system
* doesn't support this feature or when it's disabled: the kernel
- * may not do this in its implementation of the change_page_attr()
+ * may not do this in its implementation of the change_page_attr()
* interface.
*/
#ifndef X86_FEATURE_NX
diff -ru usr/src/nv/nv-reg.h usr/src/nv.2286310/nv-reg.h
--- usr/src/nv/nv-reg.h 2008-03-16 14:13:10.000000000 -0700
+++ usr/src/nv.2286310/nv-reg.h 2008-03-16 14:37:47.204131496 -0700
@@ -391,34 +391,36 @@
#define NV_REG_REMAP_LIMIT NV_REG_STRING(__NV_REMAP_LIMIT)
/*
- * Option: UseCPA
+ * Option: UpdateMemoryTypes
*
* Description:
*
- * Many kernels have a broken implementation of change_page_attr that leads
- * to cache aliasing problems. x86_64 kernels between 2.6.0 and 2.6.10 will
- * force a kernel BUG_ON() when this condition is encountered. For this
- * reason, the NVIDIA driver is very careful about not using the CPA kernel
- * interface on these kernels.
- *
- * Some distributions have backported this fix to kernel versions that fall
- * within this version range. The NVIDIA driver attempts to automatically
- * detect these fixes and reenable usage of the change_page_attr interface.
- *
- * Due to the serious nature of the problems that can arise from this, the
- * NVIDIA driver implements a manual registry key to force usage of this API
- * to be enabled or disabled. This registry key can be used to force usage
- * of the API on a known fixed kernel if the NVIDIA driver fails to detect
- * the kernel as fixed. This registry key can also be used to disable usage
- * of the API on a bad kernel that is misdetected as a fixed kernel.
- *
- * The default value is '-1' (use NVIDIA driver default logic)
- * A value of '0' will forcibly disable change_page_attr calls.
- * A value of '1' will forcibly enable change_page_attr calls.
+ * Many kernels have broken implementations of the change_page_attr()
+ * kernel interface that may cause cache aliasing problems. Linux/x86-64
+ * kernels between 2.6.0 and 2.6.10 may prompt kernel BUG()s due to
+ * improper accounting in the interface's large page management code, for
+ * example. For this reason, the NVIDIA Linux driver is very careful about
+ * not using the change_page_attr() kernel interface on these kernels.
+ *
+ * Due to the serious nature of the problems that can arise from bugs in
+ * the change_page_attr(), set_pages_{uc,wb}() and other kernel interfaces
+ * used to modify memory types, the NVIDIA driver implements a manual
+ * registry key override to allow forcibly enabling or disabling use of
+ * these APIs.
+ *
+ * Possible values:
+ *
+ * ~0 = use the NVIDIA driver's default logic (default)
+ * 0 = enable use of change_page_attr(), etc.
+ * 1 = disable use of change_page_attr(), etc.
+ *
+ * By default, the NVIDIA driver will attempt to auto-detect if it can
+ * safely use the change_page_attr() and other kernel interfaces to modify
+ * the memory types of kernel mappings.
*/
-#define __NV_USE_CPA UseCPA
-#define NV_REG_USE_CPA NV_REG_STRING(__NV_USE_CPA)
+#define __NV_UPDATE_MEMORY_TYPES UpdateMemoryTypes
+#define NV_REG_UPDATE_MEMORY_TYPES NV_REG_STRING(__NV_UPDATE_MEMORY_TYPES)
/*
* Option: RegistryDwords
@@ -490,7 +492,7 @@
NV_DEFINE_REG_ENTRY(__NV_DEVICE_FILE_GID, 0);
NV_DEFINE_REG_ENTRY(__NV_DEVICE_FILE_MODE, 0666);
NV_DEFINE_REG_ENTRY(__NV_REMAP_LIMIT, 0);
-NV_DEFINE_REG_ENTRY(__NV_USE_CPA, -1);
+NV_DEFINE_REG_ENTRY(__NV_UPDATE_MEMORY_TYPES, ~0);
NV_DEFINE_REG_ENTRY(__NV_USE_VBIOS, 1);
NV_DEFINE_REG_ENTRY(__NV_RM_EDGE_INTR_CHECK, 1);
@@ -535,7 +537,7 @@
NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_DEVICE_FILE_GID),
NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_DEVICE_FILE_MODE),
NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_REMAP_LIMIT),
- NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_USE_CPA),
+ NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_UPDATE_MEMORY_TYPES),
NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_USE_VBIOS),
NV_DEFINE_PARAMS_TABLE_ENTRY(__NV_RM_EDGE_INTR_CHECK),
{NULL, NULL, NULL}
diff -ru usr/src/nv/nv-vm.c usr/src/nv.2286310/nv-vm.c
--- usr/src/nv/nv-vm.c 2008-03-16 14:13:09.000000000 -0700
+++ usr/src/nv.2286310/nv-vm.c 2008-03-16 14:37:47.204131496 -0700
@@ -43,42 +43,40 @@
}
#endif
-/*
- * AMD Athlon processors expose a subtle bug in the Linux
- * kernel, that may lead to AGP memory corruption. Recent
- * kernel versions had a workaround for this problem, but
- * 2.4.20 is the first kernel to address it properly. The
- * page_attr API provides the means to solve the problem.
- */
-
static inline void nv_set_page_attrib_uncached(nv_pte_t *page_ptr)
{
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
- if (nv_use_cpa)
+ if (nv_update_memory_types)
{
- struct page *page = virt_to_page(__va(page_ptr->phys_addr));
+#if defined(NV_SET_PAGES_UC_PRESENT)
+ struct page *page = NV_GET_PAGE_STRUCT(page_ptr->phys_addr);
+ set_pages_uc(page, 1);
+#elif defined(NV_CHANGE_PAGE_ATTR_PRESENT)
+ struct page *page = NV_GET_PAGE_STRUCT(page_ptr->phys_addr);
pgprot_t prot = PAGE_KERNEL_NOCACHE;
#if defined(NVCPU_X86) || defined(NVCPU_X86_64)
pgprot_val(prot) &= __nv_supported_pte_mask;
#endif
change_page_attr(page, 1, prot);
- }
#endif
+ }
}
static inline void nv_set_page_attrib_cached(nv_pte_t *page_ptr)
{
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
- if (nv_use_cpa)
+ if (nv_update_memory_types)
{
- struct page *page = virt_to_page(__va(page_ptr->phys_addr));
+#if defined(NV_SET_PAGES_UC_PRESENT)
+ struct page *page = NV_GET_PAGE_STRUCT(page_ptr->phys_addr);
+ set_pages_wb(page, 1);
+#elif defined(NV_CHANGE_PAGE_ATTR_PRESENT)
+ struct page *page = NV_GET_PAGE_STRUCT(page_ptr->phys_addr);
pgprot_t prot = PAGE_KERNEL;
#if defined(NVCPU_X86) || defined(NVCPU_X86_64)
pgprot_val(prot) &= __nv_supported_pte_mask;
#endif
change_page_attr(page, 1, prot);
+#endif
}
-#endif /* NV_CHANGE_PAGE_ATTR_PRESENT */
}
static inline void nv_lock_page(nv_pte_t *page_ptr)
@@ -360,7 +358,8 @@
#if defined(NV_CPA_NEEDS_FLUSHING)
nv_execute_on_all_cpus(cache_flush, NULL);
#endif
-#if defined (NVCPU_X86) || defined (NVCPU_X86_64)
+#if (defined(NVCPU_X86) || defined(NVCPU_X86_64)) && \
+ defined(NV_CHANGE_PAGE_ATTR_PRESENT)
global_flush_tlb();
#endif
nv_ext_flush_caches(); // handle other platform flushes if present
@@ -662,7 +661,7 @@
address = (unsigned long)virt_addr + i * PAGE_SIZE;
- pgd = NV_PGD_OFFSET(address, 1, &init_mm);
+ pgd = NV_PGD_OFFSET(address, 1, NULL);
if (!NV_PGD_PRESENT(pgd))
goto failed;
diff -ru usr/src/nv/nv.c usr/src/nv.2286310/nv.c
--- usr/src/nv/nv.c 2008-03-16 14:13:09.000000000 -0700
+++ usr/src/nv.2286310/nv.c 2008-03-16 14:37:47.208131723 -0700
@@ -15,6 +15,7 @@
#include "nv_compiler.h"
#include "os-agp.h"
#include "nv-vm.h"
+#include "nv-reg.h"
#ifdef MODULE_ALIAS_CHARDEV_MAJOR
MODULE_ALIAS_CHARDEV_MAJOR(NV_MAJOR_DEVICE_NUMBER);
@@ -116,10 +117,7 @@
unsigned int nv_remap_limit;
#endif
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
-int nv_use_cpa = 1;
-#endif
-
+int nv_update_memory_types = 1;
static int nv_mmconfig_failure_detected = 0;
static void *nv_pte_t_cache = NULL;
@@ -1030,30 +1028,26 @@
#endif /* defined(NV_BUILD_NV_PAT_SUPPORT) */
}
-
#if defined(NV_CHANGE_PAGE_ATTR_BUG_PRESENT)
-
-/* nv_verify_cpa_interface - determine if the change_page_attr bug is fixed
- * in this kernel.
+/*
+ * nv_verify_cpa_interface() - determine if the change_page_attr() large page
+ * management accounting bug known to exist in early Linux/x86-64 kernels
+ * is present in this kernel.
*
- * there's really not a good way to determine if change_page_attr is fixed.
- * we can't really use cpa on 2.6 x86_64 kernels < 2.6.11, as if we run into
- * the accounting bug, the kernel will throw a BUG. this isn't 100% accurate,
- * as it doesn't throw a bug until we try to restore the caching attributes
- * of the page. so if we can track down a 4M allocation, we can mark it
- * uncached and see if the accounting was done correctly.
- *
- * this is a little ugly, but the most accurate approach to determining if
- * this kernel is good.
+ * There's really no good way to determine if change_page_attr() is working
+ * correctly. We can't reliably use change_page_attr() on Linux/x86-64 2.6
+ * kernels < 2.6.11: if we run into the accounting bug, the Linux kernel will
+ * trigger a BUG() if we attempt to restore the WB memory type of a page
+ * originally part of a large page.
*
- * why do we even bother? some distributions have back-ported the cpa fix to
- * kernels < 2.6.11. we want to use change_page_attr to avoid random corruption
- * and hangs, but need to make sure it's safe to do so.
+ * So if we can successfully allocate such a page, change its memory type to
+ * UC and check if the accounting was done correctly, we can determine if
+ * the change_page_attr() interface can be used safely.
*
- * return values:
- * 0 - test passed, interface works
- * 1 - test failed, status unclear
- * -1 - test failed, interface broken
+ * Return values:
+ * 0 - test passed, the change_page_attr() interface works
+ * 1 - test failed, the status is unclear
+ * -1 - test failed, the change_page_attr() interface is broken
*/
static inline pte_t *check_large_page(unsigned long vaddr)
@@ -1061,7 +1055,7 @@
pgd_t *pgd = NULL;
pmd_t *pmd = NULL;
- pgd = NV_PGD_OFFSET(vaddr, 1, &init_mm);
+ pgd = NV_PGD_OFFSET(vaddr, 1, NULL);
if (!NV_PGD_PRESENT(pgd))
return NULL;
@@ -1171,20 +1165,29 @@
return 1;
}
-
#endif /* defined(NV_CHANGE_PAGE_ATTR_BUG_PRESENT) */
-
-// verify that the kernel's mapping matches the requested type
-// this is to protect against accidental cache aliasing problems
+/*
+ * nv_verify_page_mappings() - verify that the kernel mapping of the specified
+ * page matches the specified type. This is to help detect bugs in the Linux
+ * kernel's change_page_attr() interface, early.
+ *
+ * This function relies on the ability to perform kernel virtul address to PFN
+ * translations and therefore on 'init_mm'. Unfortunately, the latter is no
+ * longer exported in recent Linux/x86 2.6 kernels. The export was removed at
+ * roughtly the same time as the set_pages_{uc,wb}() change_page_attr()
+ * replacement interfaces were introduced; hopefully, it will be sufficient to
+ * check for their presence.
+ */
int nv_verify_page_mappings(
nv_pte_t *page_ptr,
unsigned int cachetype
)
{
+#if defined(NV_CHANGE_PAGE_ATTR_PRESENT) || \
+ (defined(NV_SET_PAGES_UC_PRESENT) && !defined(NVCPU_X86))
unsigned long retval = -1;
#if defined(NVCPU_X86) || defined(NVCPU_X86_64)
- struct mm_struct *mm;
pgd_t *pgd = NULL;
pmd_t *pmd = NULL;
pte_t *pte = NULL;
@@ -1192,15 +1195,12 @@
unsigned long address;
static int count = 0;
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
- if (!nv_use_cpa)
+ if (!nv_update_memory_types)
return 0;
-#endif
address = (unsigned long)__va(page_ptr->phys_addr);
- mm = &init_mm; // always a kernel page
- pgd = NV_PGD_OFFSET(address, 1, mm);
+ pgd = NV_PGD_OFFSET(address, 1, NULL);
if (!NV_PGD_PRESENT(pgd))
{
nv_printf(NV_DBG_ERRORS, "NVRM: pgd not present for addr 0x%lx\n", address);
@@ -1266,8 +1266,11 @@
}
failed:
-#endif
+#endif /* defined(NVCPU_X86) || defined(NVCPU_X86_64) */
return retval;
+#else
+ return 0;
+#endif
}
#if defined(NV_BUILD_NV_PAT_SUPPORT) && defined(CONFIG_HOTPLUG_CPU)
@@ -1313,7 +1316,7 @@
static int __init nvidia_init_module(void)
{
int rc;
- U032 i, count;
+ U032 i, count, data;
nv_state_t *nv = NV_STATE_PTR(&nv_ctl_device);
nv_stack_t *sp = NULL;
@@ -1485,43 +1488,42 @@
/* create /proc/driver/nvidia */
nvos_proc_create();
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
+ /*
+ * Give users an opportunity to disable the driver's use of
+ * the change_page_attr() and set_pages_{uc,wb}() kernel
+ * interfaces.
+ */
+ rc = rm_read_registry_dword(sp, nv,
+ "NVreg", NV_REG_UPDATE_MEMORY_TYPES, &data);
+ if ((rc == 0) && ((int)data != ~0))
{
- int data;
-
- // allow the user to override us with a registry key
- rc = rm_read_registry_dword(sp, nv, "NVreg", "UseCPA", &data);
- if ((rc == 0) && (data != -1))
- {
- nv_use_cpa = data;
- }
+ nv_update_memory_types = data;
+ }
#if defined(NV_CHANGE_PAGE_ATTR_BUG_PRESENT)
- else
+ /*
+ * Unless we explicitely detect that the change_page_attr()
+ * inteface is fixed, disable usage of the interface on
+ * this kernel. Notify the user of this problem using the
+ * driver's /proc warnings interface (read by the installer
+ * and the bug report script).
+ */
+ else
+ {
+ rc = nv_verify_cpa_interface();
+ if (rc < 0)
{
- /*
- * Unless we explicitely detect that the change_page_attr()
- * inteface is fixed, disable usage of the interface on
- * this kernel. Notify the user of this problem using the
- * driver's /proc warnings interface (read by the installer
- * and the bug report script).
- */
- rc = nv_verify_cpa_interface();
- if (rc < 0)
- {
- nv_prints(NV_DBG_ERRORS, __cpgattr_warning);
- nvos_proc_add_warning_file("change_page_attr", __cpgattr_warning);
- nv_use_cpa = 0;
- }
- else if (rc != 0)
- {
- nv_prints(NV_DBG_ERRORS, __cpgattr_warning_2);
- nvos_proc_add_warning_file("change_page_attr", __cpgattr_warning_2);
- nv_use_cpa = 0;
- }
+ nv_prints(NV_DBG_ERRORS, __cpgattr_warning);
+ nvos_proc_add_warning_file("change_page_attr", __cpgattr_warning);
+ nv_update_memory_types = 0;
+ }
+ else if (rc != 0)
+ {
+ nv_prints(NV_DBG_ERRORS, __cpgattr_warning_2);
+ nvos_proc_add_warning_file("change_page_attr", __cpgattr_warning_2);
+ nv_update_memory_types = 0;
}
-#endif
}
-#endif
+#endif /* defined(NV_CHANGE_PAGE_ATTR_BUG_PRESENT) */
#if defined(NVCPU_X86_64) && defined(CONFIG_IA32_EMULATION) && !defined(HAVE_COMPAT_IOCTL)
/* Register ioctl()'s for 32-bit clients */
@@ -3482,8 +3484,21 @@
pte_t *pte = NULL;
NvU64 retval;
- mm = (kern) ? &init_mm : current->mm;
- if (!kern) down_read(¤t->mm->mmap_sem);
+ if (!kern)
+ {
+ mm = current->mm;
+ down_read(&mm->mmap_sem);
+ }
+ else
+ {
+#if defined(NV_SET_PAGES_UC_PRESENT) && defined(NVCPU_X86)
+ /* nv_printf(NV_DBG_ERRORS,
+ "NVRM: can't translate KVA in nv_get_phys_address()!\n"); */
+ return 0;
+#else
+ mm = NULL;
+#endif
+ }
pgd = NV_PGD_OFFSET(address, kern, mm);
if (!NV_PGD_PRESENT(pgd))
@@ -3504,22 +3519,24 @@
retval &= ~_PAGE_NX;
#endif
- if (!kern) up_read(¤t->mm->mmap_sem);
+ if (!kern)
+ up_read(&mm->mmap_sem);
return retval;
failed:
- if (!kern) up_read(¤t->mm->mmap_sem);
+ if (!kern)
+ up_read(&mm->mmap_sem);
return 0;
}
NvU64 NV_API_CALL nv_get_kern_phys_address(NvU64 address)
{
- // make sure this address is a kernel pointer
+ /* make sure this address is a kernel virtual address */
#if defined(DEBUG) && !defined(CONFIG_X86_4G)
if (address < PAGE_OFFSET)
{
nv_printf(NV_DBG_WARNINGS,
- "NVRM: user address passed to get_kern_phys_address: 0x%lx\n",
+ "NVRM: user address passed to get_kern_phys_address: 0x%llx!\n",
address);
return 0;
}
@@ -3534,12 +3551,12 @@
NvU64 NV_API_CALL nv_get_kern_user_address(NvU64 address)
{
- // make sure this address is not a kernel pointer
+ /* make sure this address is not a kernel virtual address */
#if defined(DEBUG) && !defined(CONFIG_X86_4G)
if (address >= PAGE_OFFSET)
{
nv_printf(NV_DBG_WARNINGS,
- "NVRM: kernel address passed to get_user_phys_address: 0x%lx\n",
+ "NVRM: kernel address passed to get_user_phys_address: 0x%llx!\n",
address);
return 0;
}
@@ -4316,16 +4333,12 @@
return -1;
}
-int NV_API_CALL nv_no_incoherent_mappings
-(
- void
-)
+int NV_API_CALL nv_no_incoherent_mappings(void)
{
if(nv_ext_no_incoherent_mappings() == 1)
return 1;
-
-#if defined(NV_CHANGE_PAGE_ATTR_PRESENT)
- return 1;
+#if defined(NV_CHANGE_PAGE_ATTR_PRESENT) || defined(NV_SET_PAGES_UC_PRESENT)
+ return (nv_update_memory_types);
#else
return 0;
#endif
diff -ru usr/src/nv/os-interface.c usr/src/nv.2286310/os-interface.c
--- usr/src/nv/os-interface.c 2008-03-16 14:13:09.000000000 -0700
+++ usr/src/nv.2286310/os-interface.c 2008-03-16 14:37:47.208131723 -0700
@@ -1198,6 +1198,18 @@
{
void *vaddr;
+ if (start == 0)
+ {
+ if (mode != NV_MEMORY_CACHED)
+ {
+ nv_printf(NV_DBG_ERRORS,
+ "NVRM: os_map_kernel_space: won't map address 0x%0llx UC!\n", start);
+ return NULL;
+ }
+ else
+ return (void *)PAGE_OFFSET;
+ }
+
if (!NV_MAY_SLEEP())
{
nv_printf(NV_DBG_ERRORS,
@@ -1230,6 +1242,9 @@
NvU64 size_bytes
)
{
+ if (addr == (void *)PAGE_OFFSET)
+ return;
+
NV_IOUNMAP(addr, size_bytes);
}