* Copyright(c) 2010-2014 Intel Corporation
*/
+#include <errno.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
+#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <sys/mman.h>
#include <rte_memory.h>
#include <rte_eal.h>
#include <rte_eal_memconfig.h>
+#include <rte_errno.h>
#include <rte_log.h>
#include "eal_private.h"
#include "eal_internal_cfg.h"
+/*
+ * Try to mmap *size bytes in /dev/zero. If it is successful, return the
+ * pointer to the mmap'd area and keep *size unmodified. Else, retry
+ * with a smaller zone: decrease *size by hugepage_sz until it reaches
+ * 0. In this case, return NULL. Note: this function returns an address
+ * which is a multiple of hugepage size.
+ */
+
+static uint64_t baseaddr_offset;
+static uint64_t system_page_sz;
+
+void *
+eal_get_virtual_area(void *requested_addr, size_t *size,
+ size_t page_sz, int flags, int mmap_flags)
+{
+ bool addr_is_hint, allow_shrink, unmap, no_align;
+ uint64_t map_sz;
+ void *mapped_addr, *aligned_addr;
+
+ if (system_page_sz == 0)
+ system_page_sz = sysconf(_SC_PAGESIZE);
+
+ mmap_flags |= MAP_PRIVATE | MAP_ANONYMOUS;
+
+ RTE_LOG(DEBUG, EAL, "Ask a virtual area of 0x%zx bytes\n", *size);
+
+ addr_is_hint = (flags & EAL_VIRTUAL_AREA_ADDR_IS_HINT) > 0;
+ allow_shrink = (flags & EAL_VIRTUAL_AREA_ALLOW_SHRINK) > 0;
+ unmap = (flags & EAL_VIRTUAL_AREA_UNMAP) > 0;
+
+ if (requested_addr == NULL && internal_config.base_virtaddr != 0) {
+ requested_addr = (void *) (internal_config.base_virtaddr +
+ (size_t)baseaddr_offset);
+ requested_addr = RTE_PTR_ALIGN(requested_addr, page_sz);
+ addr_is_hint = true;
+ }
+
+ /* if requested address is not aligned by page size, or if requested
+ * address is NULL, add page size to requested length as we may get an
+ * address that's aligned by system page size, which can be smaller than
+ * our requested page size. additionally, we shouldn't try to align if
+ * system page size is the same as requested page size.
+ */
+ no_align = (requested_addr != NULL &&
+ ((uintptr_t)requested_addr & (page_sz - 1)) == 0) ||
+ page_sz == system_page_sz;
+
+ do {
+ map_sz = no_align ? *size : *size + page_sz;
+
+ mapped_addr = mmap(requested_addr, map_sz, PROT_READ,
+ mmap_flags, -1, 0);
+ if (mapped_addr == MAP_FAILED && allow_shrink)
+ *size -= page_sz;
+ } while (allow_shrink && mapped_addr == MAP_FAILED && *size > 0);
+
+ /* align resulting address - if map failed, we will ignore the value
+ * anyway, so no need to add additional checks.
+ */
+ aligned_addr = no_align ? mapped_addr :
+ RTE_PTR_ALIGN(mapped_addr, page_sz);
+
+ if (*size == 0) {
+ RTE_LOG(ERR, EAL, "Cannot get a virtual area of any size: %s\n",
+ strerror(errno));
+ rte_errno = errno;
+ return NULL;
+ } else if (mapped_addr == MAP_FAILED) {
+ RTE_LOG(ERR, EAL, "Cannot get a virtual area: %s\n",
+ strerror(errno));
+ /* pass errno up the call chain */
+ rte_errno = errno;
+ return NULL;
+ } else if (requested_addr != NULL && !addr_is_hint &&
+ aligned_addr != requested_addr) {
+ RTE_LOG(ERR, EAL, "Cannot get a virtual area at requested address: %p (got %p)\n",
+ requested_addr, aligned_addr);
+ munmap(mapped_addr, map_sz);
+ rte_errno = EADDRNOTAVAIL;
+ return NULL;
+ } else if (requested_addr != NULL && addr_is_hint &&
+ aligned_addr != requested_addr) {
+ RTE_LOG(WARNING, EAL, "WARNING! Base virtual address hint (%p != %p) not respected!\n",
+ requested_addr, aligned_addr);
+ RTE_LOG(WARNING, EAL, " This may cause issues with mapping memory into secondary processes\n");
+ }
+
+ if (unmap)
+ munmap(mapped_addr, map_sz);
+
+ RTE_LOG(DEBUG, EAL, "Virtual area found at %p (size = 0x%zx)\n",
+ aligned_addr, *size);
+
+ baseaddr_offset += *size;
+
+ return aligned_addr;
+}
+
/*
* Return a pointer to a read-only table of struct rte_physmem_desc
* elements, containing the layout of all addressable physical
#include <numaif.h>
#endif
+#include <rte_errno.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_launch.h>
* zone as well as a physical contiguous zone.
*/
-static uint64_t baseaddr_offset;
-
static bool phys_addrs_available = true;
#define RANDOMIZE_VA_SPACE_FILE "/proc/sys/kernel/randomize_va_space"
}
}
-/*
- * Try to mmap *size bytes in /dev/zero. If it is successful, return the
- * pointer to the mmap'd area and keep *size unmodified. Else, retry
- * with a smaller zone: decrease *size by hugepage_sz until it reaches
- * 0. In this case, return NULL. Note: this function returns an address
- * which is a multiple of hugepage size.
- */
-static void *
-get_virtual_area(size_t *size, size_t hugepage_sz)
-{
- void *addr;
- void *addr_hint;
- int fd;
- long aligned_addr;
-
- if (internal_config.base_virtaddr != 0) {
- int page_size = sysconf(_SC_PAGE_SIZE);
- addr_hint = (void *) (uintptr_t)
- (internal_config.base_virtaddr + baseaddr_offset);
- addr_hint = RTE_PTR_ALIGN_FLOOR(addr_hint, page_size);
- } else {
- addr_hint = NULL;
- }
-
- RTE_LOG(DEBUG, EAL, "Ask a virtual area of 0x%zx bytes\n", *size);
-
-
- fd = open("/dev/zero", O_RDONLY);
- if (fd < 0){
- RTE_LOG(ERR, EAL, "Cannot open /dev/zero\n");
- return NULL;
- }
- do {
- addr = mmap(addr_hint, (*size) + hugepage_sz, PROT_READ,
-#ifdef RTE_ARCH_PPC_64
- MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
-#else
- MAP_PRIVATE,
-#endif
- fd, 0);
- if (addr == MAP_FAILED) {
- *size -= hugepage_sz;
- } else if (addr_hint != NULL && addr != addr_hint) {
- RTE_LOG(WARNING, EAL, "WARNING! Base virtual address "
- "hint (%p != %p) not respected!\n",
- addr_hint, addr);
- RTE_LOG(WARNING, EAL, " This may cause issues with "
- "mapping memory into secondary processes\n");
- }
- } while (addr == MAP_FAILED && *size > 0);
-
- if (addr == MAP_FAILED) {
- close(fd);
- RTE_LOG(ERR, EAL, "Cannot get a virtual area: %s\n",
- strerror(errno));
- return NULL;
- }
-
- munmap(addr, (*size) + hugepage_sz);
- close(fd);
-
- /* align addr to a huge page size boundary */
- aligned_addr = (long)addr;
- aligned_addr += (hugepage_sz - 1);
- aligned_addr &= (~(hugepage_sz - 1));
- addr = (void *)(aligned_addr);
-
- RTE_LOG(DEBUG, EAL, "Virtual area found at %p (size = 0x%zx)\n",
- addr, *size);
-
- /* increment offset */
- baseaddr_offset += *size;
-
- return addr;
-}
-
static sigjmp_buf huge_jmpenv;
static void huge_sigbus_handler(int signo __rte_unused)
/* get the biggest virtual memory area up to
* vma_len. If it fails, vma_addr is NULL, so
* let the kernel provide the address. */
- vma_addr = get_virtual_area(&vma_len, hpi->hugepage_sz);
+ vma_addr = eal_get_virtual_area(NULL, &vma_len,
+ hpi->hugepage_sz,
+ EAL_VIRTUAL_AREA_ALLOW_SHRINK |
+ EAL_VIRTUAL_AREA_UNMAP,
+#ifdef RTE_ARCH_PPC_64
+ MAP_HUGETLB
+#else
+ 0
+#endif
+ );
if (vma_addr == NULL)
vma_len = hugepage_sz;
}
unsigned i, s = 0; /* s used to track the segment number */
unsigned max_seg = RTE_MAX_MEMSEG;
off_t size = 0;
- int fd, fd_zero = -1, fd_hugepage = -1;
+ int fd, fd_hugepage = -1;
if (aslr_enabled() > 0) {
RTE_LOG(WARNING, EAL, "WARNING: Address Space Layout Randomization "
test_phys_addrs_available();
- fd_zero = open("/dev/zero", O_RDONLY);
- if (fd_zero < 0) {
- RTE_LOG(ERR, EAL, "Could not open /dev/zero\n");
- goto error;
- }
fd_hugepage = open(eal_hugepage_info_path(), O_RDONLY);
if (fd_hugepage < 0) {
RTE_LOG(ERR, EAL, "Could not open %s\n", eal_hugepage_info_path());
/* map all segments into memory to make sure we get the addrs */
for (s = 0; s < RTE_MAX_MEMSEG; ++s) {
void *base_addr;
+ size_t mmap_sz;
+ int mmap_flags = 0;
/*
* the first memory segment with len==0 is the one that
if (mcfg->memseg[s].len == 0)
break;
- /*
- * fdzero is mmapped to get a contiguous block of virtual
- * addresses of the appropriate memseg size.
- * use mmap to get identical addresses as the primary process.
+ /* get identical addresses as the primary process.
*/
- base_addr = mmap(mcfg->memseg[s].addr, mcfg->memseg[s].len,
- PROT_READ,
#ifdef RTE_ARCH_PPC_64
- MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
-#else
- MAP_PRIVATE,
+ mmap_flags |= MAP_HUGETLB;
#endif
- fd_zero, 0);
- if (base_addr == MAP_FAILED ||
- base_addr != mcfg->memseg[s].addr) {
+ mmap_sz = mcfg->memseg[s].len;
+ base_addr = eal_get_virtual_area(mcfg->memseg[s].addr,
+ &mmap_sz, mcfg->memseg[s].hugepage_sz, 0,
+ mmap_flags);
+ if (base_addr == NULL) {
max_seg = s;
- if (base_addr != MAP_FAILED) {
- /* errno is stale, don't use */
- RTE_LOG(ERR, EAL, "Could not mmap %zu bytes "
- "in /dev/zero at [%p], got [%p] - "
- "please use '--base-virtaddr' option\n",
+ if (rte_errno == EADDRNOTAVAIL) {
+ RTE_LOG(ERR, EAL, "Could not mmap %zu bytes at [%p] - please use '--base-virtaddr' option\n",
mcfg->memseg[s].len,
- mcfg->memseg[s].addr, base_addr);
- munmap(base_addr, mcfg->memseg[s].len);
+ mcfg->memseg[s].addr);
} else {
- RTE_LOG(ERR, EAL, "Could not mmap %zu bytes "
- "in /dev/zero at [%p]: '%s'\n",
+ RTE_LOG(ERR, EAL, "Could not mmap %zu bytes at [%p]: '%s'\n",
mcfg->memseg[s].len,
- mcfg->memseg[s].addr, strerror(errno));
+ mcfg->memseg[s].addr,
+ rte_strerror(rte_errno));
}
if (aslr_enabled() > 0) {
RTE_LOG(ERR, EAL, "It is recommended to "
}
/* unmap the hugepage config file, since we are done using it */
munmap(hp, size);
- close(fd_zero);
close(fd_hugepage);
return 0;
munmap(mcfg->memseg[i].addr, mcfg->memseg[i].len);
if (hp != NULL && hp != MAP_FAILED)
munmap(hp, size);
- if (fd_zero >= 0)
- close(fd_zero);
if (fd_hugepage >= 0)
close(fd_hugepage);
return -1;
git.droids-corp.org / dpdk.git / commitdiff