#include "eal_memcfg.h"
#include "eal_vfio.h"
#include "eal_private.h"
+#include "eal_internal_cfg.h"
#ifdef VFIO_PRESENT
return;
}
-#ifdef RTE_ARCH_PPC_64
- ms = rte_mem_virt2memseg(addr, msl);
- while (cur_len < len) {
- int idx = rte_fbarray_find_idx(&msl->memseg_arr, ms);
-
- rte_fbarray_set_free(&msl->memseg_arr, idx);
- cur_len += ms->len;
- ++ms;
- }
- cur_len = 0;
-#endif
/* memsegs are contiguous in memory */
ms = rte_mem_virt2memseg(addr, msl);
iova_expected - iova_start, 0);
}
}
-#ifdef RTE_ARCH_PPC_64
- cur_len = 0;
- ms = rte_mem_virt2memseg(addr, msl);
- while (cur_len < len) {
- int idx = rte_fbarray_find_idx(&msl->memseg_arr, ms);
-
- rte_fbarray_set_used(&msl->memseg_arr, idx);
- cur_len += ms->len;
- ++ms;
- }
-#endif
}
static int
return rte_memseg_walk(type1_map, &vfio_container_fd);
}
+/* Track the size of the statically allocated DMA window for SPAPR */
+uint64_t spapr_dma_win_len;
+uint64_t spapr_dma_win_page_sz;
+
static int
vfio_spapr_dma_do_map(int vfio_container_fd, uint64_t vaddr, uint64_t iova,
uint64_t len, int do_map)
{
- struct vfio_iommu_type1_dma_map dma_map;
- struct vfio_iommu_type1_dma_unmap dma_unmap;
- int ret;
struct vfio_iommu_spapr_register_memory reg = {
.argsz = sizeof(reg),
+ .vaddr = (uintptr_t) vaddr,
+ .size = len,
.flags = 0
};
- reg.vaddr = (uintptr_t) vaddr;
- reg.size = len;
+ int ret;
if (do_map != 0) {
+ struct vfio_iommu_type1_dma_map dma_map;
+
+ if (iova + len > spapr_dma_win_len) {
+ RTE_LOG(ERR, EAL, " dma map attempt outside DMA window\n");
+ return -1;
+ }
+
ret = ioctl(vfio_container_fd,
VFIO_IOMMU_SPAPR_REGISTER_MEMORY, ®);
if (ret) {
ret = ioctl(vfio_container_fd, VFIO_IOMMU_MAP_DMA, &dma_map);
if (ret) {
- /**
- * In case the mapping was already done EBUSY will be
- * returned from kernel.
- */
- if (errno == EBUSY) {
- RTE_LOG(DEBUG, EAL,
- " Memory segment is already mapped,"
- " skipping");
- } else {
- RTE_LOG(ERR, EAL,
- " cannot set up DMA remapping,"
- " error %i (%s)\n", errno,
- strerror(errno));
- return -1;
- }
+ RTE_LOG(ERR, EAL, " cannot map vaddr for IOMMU, error %i (%s)\n",
+ errno, strerror(errno));
+ return -1;
}
} else {
+ struct vfio_iommu_type1_dma_map dma_unmap;
+
memset(&dma_unmap, 0, sizeof(dma_unmap));
dma_unmap.argsz = sizeof(struct vfio_iommu_type1_dma_unmap);
dma_unmap.size = len;
ret = ioctl(vfio_container_fd, VFIO_IOMMU_UNMAP_DMA,
&dma_unmap);
if (ret) {
- RTE_LOG(ERR, EAL, " cannot clear DMA remapping, error %i (%s)\n",
- errno, strerror(errno));
+ RTE_LOG(ERR, EAL, " cannot unmap vaddr for IOMMU, error %i (%s)\n",
+ errno, strerror(errno));
return -1;
}
VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY, ®);
if (ret) {
RTE_LOG(ERR, EAL, " cannot unregister vaddr for IOMMU, error %i (%s)\n",
- errno, strerror(errno));
+ errno, strerror(errno));
return -1;
}
}
- return 0;
+ return ret;
}
static int
if (ms->iova == RTE_BAD_IOVA)
return 0;
- return vfio_spapr_dma_do_map(*vfio_container_fd, ms->addr_64, ms->iova,
- ms->len, 1);
+ return vfio_spapr_dma_do_map(*vfio_container_fd,
+ ms->addr_64, ms->iova, ms->len, 1);
}
+struct spapr_size_walk_param {
+ uint64_t max_va;
+ uint64_t page_sz;
+ bool is_user_managed;
+};
+
+/*
+ * In order to set the DMA window size required for the SPAPR IOMMU
+ * we need to walk the existing virtual memory allocations as well as
+ * find the hugepage size used.
+ */
static int
-vfio_spapr_unmap_walk(const struct rte_memseg_list *msl,
- const struct rte_memseg *ms, void *arg)
+vfio_spapr_size_walk(const struct rte_memseg_list *msl, void *arg)
{
- int *vfio_container_fd = arg;
+ struct spapr_size_walk_param *param = arg;
+ uint64_t max = (uint64_t) msl->base_va + (uint64_t) msl->len;
- /* skip external memory that isn't a heap */
- if (msl->external && !msl->heap)
+ if (msl->external && !msl->heap) {
+ /* ignore user managed external memory */
+ param->is_user_managed = true;
return 0;
+ }
- /* skip any segments with invalid IOVA addresses */
- if (ms->iova == RTE_BAD_IOVA)
- return 0;
+ if (max > param->max_va) {
+ param->page_sz = msl->page_sz;
+ param->max_va = max;
+ }
- return vfio_spapr_dma_do_map(*vfio_container_fd, ms->addr_64, ms->iova,
- ms->len, 0);
+ return 0;
}
-struct spapr_walk_param {
- uint64_t window_size;
- uint64_t hugepage_sz;
-};
-
+/*
+ * Find the highest memory address used in physical or virtual address
+ * space and use that as the top of the DMA window.
+ */
static int
-vfio_spapr_window_size_walk(const struct rte_memseg_list *msl,
- const struct rte_memseg *ms, void *arg)
+find_highest_mem_addr(struct spapr_size_walk_param *param)
{
- struct spapr_walk_param *param = arg;
- uint64_t max = ms->iova + ms->len;
+ /* find the maximum IOVA address for setting the DMA window size */
+ if (rte_eal_iova_mode() == RTE_IOVA_PA) {
+ static const char proc_iomem[] = "/proc/iomem";
+ static const char str_sysram[] = "System RAM";
+ uint64_t start, end, max = 0;
+ char *line = NULL;
+ char *dash, *space;
+ size_t line_len;
- /* skip external memory that isn't a heap */
- if (msl->external && !msl->heap)
+ /*
+ * Example "System RAM" in /proc/iomem:
+ * 00000000-1fffffffff : System RAM
+ * 200000000000-201fffffffff : System RAM
+ */
+ FILE *fd = fopen(proc_iomem, "r");
+ if (fd == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot open %s\n", proc_iomem);
+ return -1;
+ }
+ /* Scan /proc/iomem for the highest PA in the system */
+ while (getline(&line, &line_len, fd) != -1) {
+ if (strstr(line, str_sysram) == NULL)
+ continue;
+
+ space = strstr(line, " ");
+ dash = strstr(line, "-");
+
+ /* Validate the format of the memory string */
+ if (space == NULL || dash == NULL || space < dash) {
+ RTE_LOG(ERR, EAL, "Can't parse line \"%s\" in file %s\n",
+ line, proc_iomem);
+ continue;
+ }
+
+ start = strtoull(line, NULL, 16);
+ end = strtoull(dash + 1, NULL, 16);
+ RTE_LOG(DEBUG, EAL, "Found system RAM from 0x%" PRIx64
+ " to 0x%" PRIx64 "\n", start, end);
+ if (end > max)
+ max = end;
+ }
+ free(line);
+ fclose(fd);
+
+ if (max == 0) {
+ RTE_LOG(ERR, EAL, "Failed to find valid \"System RAM\" "
+ "entry in file %s\n", proc_iomem);
+ return -1;
+ }
+
+ spapr_dma_win_len = rte_align64pow2(max + 1);
return 0;
+ } else if (rte_eal_iova_mode() == RTE_IOVA_VA) {
+ RTE_LOG(DEBUG, EAL, "Highest VA address in memseg list is 0x%"
+ PRIx64 "\n", param->max_va);
+ spapr_dma_win_len = rte_align64pow2(param->max_va);
+ return 0;
+ }
- /* skip any segments with invalid IOVA addresses */
- if (ms->iova == RTE_BAD_IOVA)
+ spapr_dma_win_len = 0;
+ RTE_LOG(ERR, EAL, "Unsupported IOVA mode\n");
+ return -1;
+}
+
+
+/*
+ * The SPAPRv2 IOMMU supports 2 DMA windows with starting
+ * address at 0 or 1<<59. By default, a DMA window is set
+ * at address 0, 2GB long, with a 4KB page. For DPDK we
+ * must remove the default window and setup a new DMA window
+ * based on the hugepage size and memory requirements of
+ * the application before we can map memory for DMA.
+ */
+static int
+spapr_dma_win_size(void)
+{
+ struct spapr_size_walk_param param;
+
+ /* only create DMA window once */
+ if (spapr_dma_win_len > 0)
return 0;
- if (max > param->window_size) {
- param->hugepage_sz = ms->hugepage_sz;
- param->window_size = max;
+ /* walk the memseg list to find the page size/max VA address */
+ memset(¶m, 0, sizeof(param));
+ if (rte_memseg_list_walk(vfio_spapr_size_walk, ¶m) < 0) {
+ RTE_LOG(ERR, EAL, "Failed to walk memseg list for DMA window size\n");
+ return -1;
}
+ /* we can't be sure if DMA window covers external memory */
+ if (param.is_user_managed)
+ RTE_LOG(WARNING, EAL, "Detected user managed external memory which may not be managed by the IOMMU\n");
+
+ /* check physical/virtual memory size */
+ if (find_highest_mem_addr(¶m) < 0)
+ return -1;
+ RTE_LOG(DEBUG, EAL, "Setting DMA window size to 0x%" PRIx64 "\n",
+ spapr_dma_win_len);
+ spapr_dma_win_page_sz = param.page_sz;
+ rte_mem_set_dma_mask(__builtin_ctzll(spapr_dma_win_len));
return 0;
}
static int
-vfio_spapr_create_new_dma_window(int vfio_container_fd,
- struct vfio_iommu_spapr_tce_create *create) {
+vfio_spapr_create_dma_window(int vfio_container_fd)
+{
+ struct vfio_iommu_spapr_tce_create create = {
+ .argsz = sizeof(create), };
struct vfio_iommu_spapr_tce_remove remove = {
- .argsz = sizeof(remove),
- };
+ .argsz = sizeof(remove), };
struct vfio_iommu_spapr_tce_info info = {
- .argsz = sizeof(info),
- };
+ .argsz = sizeof(info), };
int ret;
- /* query spapr iommu info */
+ ret = spapr_dma_win_size();
+ if (ret < 0)
+ return ret;
+
ret = ioctl(vfio_container_fd, VFIO_IOMMU_SPAPR_TCE_GET_INFO, &info);
if (ret) {
- RTE_LOG(ERR, EAL, " cannot get iommu info, "
- "error %i (%s)\n", errno, strerror(errno));
+ RTE_LOG(ERR, EAL, " can't get iommu info, error %i (%s)\n",
+ errno, strerror(errno));
return -1;
}
- /* remove default DMA of 32 bit window */
+ /*
+ * sPAPR v1/v2 IOMMU always has a default 1G DMA window set. The window
+ * can't be changed for v1 but it can be changed for v2. Since DPDK only
+ * supports v2, remove the default DMA window so it can be resized.
+ */
remove.start_addr = info.dma32_window_start;
ret = ioctl(vfio_container_fd, VFIO_IOMMU_SPAPR_TCE_REMOVE, &remove);
- if (ret) {
- RTE_LOG(ERR, EAL, " cannot remove default DMA window, "
- "error %i (%s)\n", errno, strerror(errno));
+ if (ret)
return -1;
- }
- /* create new DMA window */
- ret = ioctl(vfio_container_fd, VFIO_IOMMU_SPAPR_TCE_CREATE, create);
- if (ret) {
+ /* create a new DMA window (start address is not selectable) */
+ create.window_size = spapr_dma_win_len;
+ create.page_shift = __builtin_ctzll(spapr_dma_win_page_sz);
+ create.levels = 1;
+ ret = ioctl(vfio_container_fd, VFIO_IOMMU_SPAPR_TCE_CREATE, &create);
#ifdef VFIO_IOMMU_SPAPR_INFO_DDW
- /* try possible page_shift and levels for workaround */
+ /*
+ * The vfio_iommu_spapr_tce_info structure was modified in
+ * Linux kernel 4.2.0 to add support for the
+ * vfio_iommu_spapr_tce_ddw_info structure needed to try
+ * multiple table levels. Skip the attempt if running with
+ * an older kernel.
+ */
+ if (ret) {
+ /* if at first we don't succeed, try more levels */
uint32_t levels;
- for (levels = create->levels + 1;
+ for (levels = create.levels + 1;
ret && levels <= info.ddw.levels; levels++) {
- create->levels = levels;
+ create.levels = levels;
ret = ioctl(vfio_container_fd,
- VFIO_IOMMU_SPAPR_TCE_CREATE, create);
- }
-#endif
- if (ret) {
- RTE_LOG(ERR, EAL, " cannot create new DMA window, "
- "error %i (%s)\n", errno, strerror(errno));
- return -1;
+ VFIO_IOMMU_SPAPR_TCE_CREATE, &create);
}
}
-
- if (create->start_addr != 0) {
- RTE_LOG(ERR, EAL, " DMA window start address != 0\n");
+#endif /* VFIO_IOMMU_SPAPR_INFO_DDW */
+ if (ret) {
+ RTE_LOG(ERR, EAL, " cannot create new DMA window, error %i (%s)\n",
+ errno, strerror(errno));
+ RTE_LOG(ERR, EAL, " consider using a larger hugepage size "
+ "if supported by the system\n");
return -1;
}
- return 0;
+ /* verify the start address */
+ if (create.start_addr != 0) {
+ RTE_LOG(ERR, EAL, " received unsupported start address 0x%"
+ PRIx64 "\n", (uint64_t)create.start_addr);
+ return -1;
+ }
+ return ret;
}
static int
-vfio_spapr_dma_mem_map(int vfio_container_fd, uint64_t vaddr, uint64_t iova,
- uint64_t len, int do_map)
+vfio_spapr_dma_mem_map(int vfio_container_fd, uint64_t vaddr,
+ uint64_t iova, uint64_t len, int do_map)
{
- struct spapr_walk_param param;
- struct vfio_iommu_spapr_tce_create create = {
- .argsz = sizeof(create),
- };
- struct vfio_config *vfio_cfg;
- struct user_mem_maps *user_mem_maps;
- int i, ret = 0;
-
- vfio_cfg = get_vfio_cfg_by_container_fd(vfio_container_fd);
- if (vfio_cfg == NULL) {
- RTE_LOG(ERR, EAL, " invalid container fd!\n");
- return -1;
- }
-
- user_mem_maps = &vfio_cfg->mem_maps;
- rte_spinlock_recursive_lock(&user_mem_maps->lock);
-
- /* check if window size needs to be adjusted */
- memset(¶m, 0, sizeof(param));
-
- /* we're inside a callback so use thread-unsafe version */
- if (rte_memseg_walk_thread_unsafe(vfio_spapr_window_size_walk,
- ¶m) < 0) {
- RTE_LOG(ERR, EAL, "Could not get window size\n");
- ret = -1;
- goto out;
- }
-
- /* also check user maps */
- for (i = 0; i < user_mem_maps->n_maps; i++) {
- uint64_t max = user_mem_maps->maps[i].iova +
- user_mem_maps->maps[i].len;
- param.window_size = RTE_MAX(param.window_size, max);
- }
-
- /* sPAPR requires window size to be a power of 2 */
- create.window_size = rte_align64pow2(param.window_size);
- create.page_shift = __builtin_ctzll(param.hugepage_sz);
- create.levels = 1;
+ int ret = 0;
if (do_map) {
- /* re-create window and remap the entire memory */
- if (iova + len > create.window_size) {
- /* release all maps before recreating the window */
- if (rte_memseg_walk_thread_unsafe(vfio_spapr_unmap_walk,
- &vfio_container_fd) < 0) {
- RTE_LOG(ERR, EAL, "Could not release DMA maps\n");
- ret = -1;
- goto out;
- }
- /* release all user maps */
- for (i = 0; i < user_mem_maps->n_maps; i++) {
- struct user_mem_map *map =
- &user_mem_maps->maps[i];
- if (vfio_spapr_dma_do_map(vfio_container_fd,
- map->addr, map->iova, map->len,
- 0)) {
- RTE_LOG(ERR, EAL, "Could not release user DMA maps\n");
- ret = -1;
- goto out;
- }
- }
- create.window_size = rte_align64pow2(iova + len);
- if (vfio_spapr_create_new_dma_window(vfio_container_fd,
- &create) < 0) {
- RTE_LOG(ERR, EAL, "Could not create new DMA window\n");
- ret = -1;
- goto out;
- }
- /* we're inside a callback, so use thread-unsafe version
- */
- if (rte_memseg_walk_thread_unsafe(vfio_spapr_map_walk,
- &vfio_container_fd) < 0) {
- RTE_LOG(ERR, EAL, "Could not recreate DMA maps\n");
- ret = -1;
- goto out;
- }
- /* remap all user maps */
- for (i = 0; i < user_mem_maps->n_maps; i++) {
- struct user_mem_map *map =
- &user_mem_maps->maps[i];
- if (vfio_spapr_dma_do_map(vfio_container_fd,
- map->addr, map->iova, map->len,
- 1)) {
- RTE_LOG(ERR, EAL, "Could not recreate user DMA maps\n");
- ret = -1;
- goto out;
- }
- }
- }
- if (vfio_spapr_dma_do_map(vfio_container_fd, vaddr, iova, len, 1)) {
+ if (vfio_spapr_dma_do_map(vfio_container_fd,
+ vaddr, iova, len, 1)) {
RTE_LOG(ERR, EAL, "Failed to map DMA\n");
ret = -1;
- goto out;
}
} else {
- /* for unmap, check if iova within DMA window */
- if (iova > create.window_size) {
- RTE_LOG(ERR, EAL, "iova beyond DMA window for unmap");
+ if (vfio_spapr_dma_do_map(vfio_container_fd,
+ vaddr, iova, len, 0)) {
+ RTE_LOG(ERR, EAL, "Failed to unmap DMA\n");
ret = -1;
- goto out;
}
-
- vfio_spapr_dma_do_map(vfio_container_fd, vaddr, iova, len, 0);
}
-out:
- rte_spinlock_recursive_unlock(&user_mem_maps->lock);
+
return ret;
}
static int
vfio_spapr_dma_map(int vfio_container_fd)
{
- struct vfio_iommu_spapr_tce_create create = {
- .argsz = sizeof(create),
- };
- struct spapr_walk_param param;
-
- memset(¶m, 0, sizeof(param));
-
- /* create DMA window from 0 to max(phys_addr + len) */
- rte_memseg_walk(vfio_spapr_window_size_walk, ¶m);
-
- /* sPAPR requires window size to be a power of 2 */
- create.window_size = rte_align64pow2(param.window_size);
- create.page_shift = __builtin_ctzll(param.hugepage_sz);
- create.levels = 1;
-
- if (vfio_spapr_create_new_dma_window(vfio_container_fd, &create) < 0) {
- RTE_LOG(ERR, EAL, "Could not create new DMA window\n");
+ if (vfio_spapr_create_dma_window(vfio_container_fd) < 0) {
+ RTE_LOG(ERR, EAL, "Could not create new DMA window!\n");
return -1;
}
- /* map all DPDK segments for DMA. use 1:1 PA to IOVA mapping */
+ /* map all existing DPDK segments for DMA */
if (rte_memseg_walk(vfio_spapr_map_walk, &vfio_container_fd) < 0)
return -1;
git.droids-corp.org / dpdk.git / commitdiff