[PATCH] eal: remove single file segments related code

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

Commit c711ccb30987 ("ivshmem: remove library and its EAL integration")
removed ivshmem support, but seems David forgot to remove the another
piece of code: code for RTE_EAL_SINGLE_FILE_SEGMENTS, which is introduced
when ivshmem was firstly added.

Now ivshmem was removed and a simple git grep shows no one else
references it; I think we can now rmeove it.

Cc: David Marchand <david.marchand@6wind.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---

NOTE: only have done some build tests.


 lib/librte_eal/common/eal_filesystem.h   |  11 --
 lib/librte_eal/common/eal_hugepages.h    |   3 -
 lib/librte_eal/linuxapp/eal/eal_memory.c | 277 +------------------------------
 3 files changed, 3 insertions(+), 288 deletions(-)

diff --git a/lib/librte_eal/common/eal_filesystem.h b/lib/librte_eal/common/eal_filesystem.h
index fdb4a70..8acbd99 100644
--- a/lib/librte_eal/common/eal_filesystem.h
+++ b/lib/librte_eal/common/eal_filesystem.h
@@ -97,17 +97,6 @@ eal_get_hugefile_path(char *buffer, size_t buflen, const char *hugedir, int f_id
 	return buffer;
 }
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-static inline const char *
-eal_get_hugefile_temp_path(char *buffer, size_t buflen, const char *hugedir, int f_id)
-{
-	snprintf(buffer, buflen, TEMP_HUGEFILE_FMT, hugedir,
-			internal_config.hugefile_prefix, f_id);
-	buffer[buflen - 1] = '\0';
-	return buffer;
-}
-#endif
-
 /** define the default filename prefix for the %s values above */
 #define HUGEFILE_PREFIX_DEFAULT "rte"
 
diff --git a/lib/librte_eal/common/eal_hugepages.h b/lib/librte_eal/common/eal_hugepages.h
index 38edac0..68369f2 100644
--- a/lib/librte_eal/common/eal_hugepages.h
+++ b/lib/librte_eal/common/eal_hugepages.h
@@ -52,9 +52,6 @@ struct hugepage_file {
 	int socket_id;      /**< NUMA socket ID */
 	int file_id;        /**< the '%d' in HUGEFILE_FMT */
 	int memseg_id;      /**< the memory segment to which page belongs */
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-	int repeated;		/**< number of times the page size is repeated */
-#endif
 	char filepath[MAX_HUGEPAGE_PATH]; /**< path to backing file on filesystem */
 };
 
diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index 992a1b1..9517927 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -376,25 +376,15 @@ map_all_hugepages(struct hugepage_file *hugepg_tbl,
 	void *vma_addr = NULL;
 	size_t vma_len = 0;
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-	RTE_SET_USED(vma_len);
-#endif
-
 	for (i = 0; i < hpi->num_pages[0]; i++) {
 		uint64_t hugepage_sz = hpi->hugepage_sz;
 
 		if (orig) {
 			hugepg_tbl[i].file_id = i;
 			hugepg_tbl[i].size = hugepage_sz;
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-			eal_get_hugefile_temp_path(hugepg_tbl[i].filepath,
-					sizeof(hugepg_tbl[i].filepath), hpi->hugedir,
-					hugepg_tbl[i].file_id);
-#else
 			eal_get_hugefile_path(hugepg_tbl[i].filepath,
 					sizeof(hugepg_tbl[i].filepath), hpi->hugedir,
 					hugepg_tbl[i].file_id);
-#endif
 			hugepg_tbl[i].filepath[sizeof(hugepg_tbl[i].filepath) - 1] = '\0';
 		}
 #ifndef RTE_ARCH_64
@@ -408,8 +398,6 @@ map_all_hugepages(struct hugepage_file *hugepg_tbl,
 			continue;
 		}
 #endif
-
-#ifndef RTE_EAL_SINGLE_FILE_SEGMENTS
 		else if (vma_len == 0) {
 			unsigned j, num_pages;
 
@@ -439,7 +427,6 @@ map_all_hugepages(struct hugepage_file *hugepg_tbl,
 			if (vma_addr == NULL)
 				vma_len = hugepage_sz;
 		}
-#endif
 
 		/* try to create hugepage file */
 		fd = open(hugepg_tbl[i].filepath, O_CREAT | O_RDWR, 0755);
@@ -505,169 +492,6 @@ map_all_hugepages(struct hugepage_file *hugepg_tbl,
 	return i;
 }
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-
-/*
- * Remaps all hugepages into single file segments
- */
-static int
-remap_all_hugepages(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
-{
-	int fd;
-	unsigned i = 0, j, num_pages, page_idx = 0;
-	void *vma_addr = NULL, *old_addr = NULL, *page_addr = NULL;
-	size_t vma_len = 0;
-	size_t hugepage_sz = hpi->hugepage_sz;
-	size_t total_size, offset;
-	char filepath[MAX_HUGEPAGE_PATH];
-	phys_addr_t physaddr;
-	int socket;
-
-	while (i < hpi->num_pages[0]) {
-
-#ifndef RTE_ARCH_64
-		/* for 32-bit systems, don't remap 1G pages and 16G pages,
-		 * just reuse original map address as final map address.
-		 */
-		if ((hugepage_sz == RTE_PGSIZE_1G)
-			|| (hugepage_sz == RTE_PGSIZE_16G)) {
-			hugepg_tbl[i].final_va = hugepg_tbl[i].orig_va;
-			hugepg_tbl[i].orig_va = NULL;
-			i++;
-			continue;
-		}
-#endif
-
-		/* reserve a virtual area for next contiguous
-		 * physical block: count the number of
-		 * contiguous physical pages. */
-		for (j = i+1; j < hpi->num_pages[0] ; j++) {
-#ifdef RTE_ARCH_PPC_64
-			/* The physical addresses are sorted in descending
-			 * order on PPC64 */
-			if (hugepg_tbl[j].physaddr !=
-				hugepg_tbl[j-1].physaddr - hugepage_sz)
-				break;
-#else
-			if (hugepg_tbl[j].physaddr !=
-				hugepg_tbl[j-1].physaddr + hugepage_sz)
-				break;
-#endif
-		}
-		num_pages = j - i;
-		vma_len = num_pages * hugepage_sz;
-
-		socket = hugepg_tbl[i].socket_id;
-
-		/* 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);
-
-		/* If we can't find a big enough virtual area, work out how many pages
-		 * we are going to get */
-		if (vma_addr == NULL)
-			j = i + 1;
-		else if (vma_len != num_pages * hugepage_sz) {
-			num_pages = vma_len / hugepage_sz;
-			j = i + num_pages;
-
-		}
-
-		hugepg_tbl[page_idx].file_id = page_idx;
-		eal_get_hugefile_path(filepath,
-				sizeof(filepath),
-				hpi->hugedir,
-				hugepg_tbl[page_idx].file_id);
-
-		/* try to create hugepage file */
-		fd = open(filepath, O_CREAT | O_RDWR, 0755);
-		if (fd < 0) {
-			RTE_LOG(ERR, EAL, "%s(): open failed: %s\n", __func__, strerror(errno));
-			return -1;
-		}
-
-		total_size = 0;
-		for (;i < j; i++) {
-
-			/* unmap current segment */
-			if (total_size > 0)
-				munmap(vma_addr, total_size);
-
-			/* unmap original page */
-			munmap(hugepg_tbl[i].orig_va, hugepage_sz);
-			unlink(hugepg_tbl[i].filepath);
-
-			total_size += hugepage_sz;
-
-			old_addr = vma_addr;
-
-			/* map new, bigger segment, and populate page tables,
-			 * the kernel fills this segment with zeros */
-			vma_addr = mmap(vma_addr, total_size,
-					PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, 0);
-
-			if (vma_addr == MAP_FAILED || vma_addr != old_addr) {
-				RTE_LOG(ERR, EAL, "%s(): mmap failed: %s\n", __func__, strerror(errno));
-				close(fd);
-				return -1;
-			}
-		}
-
-		/* set shared flock on the file. */
-		if (flock(fd, LOCK_SH | LOCK_NB) == -1) {
-			RTE_LOG(ERR, EAL, "%s(): Locking file failed:%s \n",
-				__func__, strerror(errno));
-			close(fd);
-			return -1;
-		}
-
-		snprintf(hugepg_tbl[page_idx].filepath, MAX_HUGEPAGE_PATH, "%s",
-				filepath);
-
-		physaddr = rte_mem_virt2phy(vma_addr);
-
-		if (physaddr == RTE_BAD_PHYS_ADDR)
-			return -1;
-
-		hugepg_tbl[page_idx].final_va = vma_addr;
-
-		hugepg_tbl[page_idx].physaddr = physaddr;
-
-		hugepg_tbl[page_idx].repeated = num_pages;
-
-		hugepg_tbl[page_idx].socket_id = socket;
-
-		close(fd);
-
-		/* verify the memory segment - that is, check that every VA corresponds
-		 * to the physical address we expect to see
-		 */
-		for (offset = 0; offset < vma_len; offset += hugepage_sz) {
-			uint64_t expected_physaddr;
-
-			expected_physaddr = hugepg_tbl[page_idx].physaddr + offset;
-			page_addr = RTE_PTR_ADD(vma_addr, offset);
-			physaddr = rte_mem_virt2phy(page_addr);
-
-			if (physaddr != expected_physaddr) {
-				RTE_LOG(ERR, EAL, "Segment sanity check failed: wrong physaddr "
-						"at %p (offset 0x%" PRIx64 ": 0x%" PRIx64
-						" (expected 0x%" PRIx64 ")\n",
-						page_addr, offset, physaddr, expected_physaddr);
-				return -1;
-			}
-		}
-
-		page_idx++;
-	}
-
-	/* zero out the rest */
-	memset(&hugepg_tbl[page_idx], 0, (hpi->num_pages[0] - page_idx) * sizeof(struct hugepage_file));
-	return page_idx;
-}
-#else/* RTE_EAL_SINGLE_FILE_SEGMENTS=n */
-
 /* Unmap all hugepages from original mapping */
 static int
 unmap_all_hugepages_orig(struct hugepage_file *hugepg_tbl, struct hugepage_info *hpi)
@@ -681,7 +505,6 @@ unmap_all_hugepages_orig(struct hugepage_file *hugepg_tbl, struct hugepage_info
         }
         return 0;
 }
-#endif /* RTE_EAL_SINGLE_FILE_SEGMENTS */
 
 /*
  * Parse /proc/self/numa_maps to get the NUMA socket ID for each huge
@@ -875,12 +698,6 @@ unmap_unneeded_hugepages(struct hugepage_file *hugepg_tbl,
 			for (page = 0; page < nrpages; page++) {
 				struct hugepage_file *hp = &hugepg_tbl[page];
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-				/* if this page was already cleared */
-				if (hp->final_va == NULL)
-					continue;
-#endif
-
 				/* find a page that matches the criteria */
 				if ((hp->size == hpi[size].hugepage_sz) &&
 						(hp->socket_id == (int) socket)) {
@@ -889,11 +706,7 @@ unmap_unneeded_hugepages(struct hugepage_file *hugepg_tbl,
 					if (pages_found == hpi[size].num_pages[socket]) {
 						uint64_t unmap_len;
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-						unmap_len = hp->size * hp->repeated;
-#else
 						unmap_len = hp->size;
-#endif
 
 						/* get start addr and len of the remaining segment */
 						munmap(hp->final_va, (size_t) unmap_len);
@@ -904,50 +717,10 @@ unmap_unneeded_hugepages(struct hugepage_file *hugepg_tbl,
 									__func__, hp->filepath, strerror(errno));
 							return -1;
 						}
-					}
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-					/* else, check how much do we need to map */
-					else {
-						int nr_pg_left =
-								hpi[size].num_pages[socket] - pages_found;
-
-						/* if we need enough memory to fit into the segment */
-						if (hp->repeated <= nr_pg_left) {
-							pages_found += hp->repeated;
-						}
-						/* truncate the segment */
-						else {
-							uint64_t final_size = nr_pg_left * hp->size;
-							uint64_t seg_size = hp->repeated * hp->size;
-
-							void * unmap_va = RTE_PTR_ADD(hp->final_va,
-									final_size);
-							int fd;
-
-							munmap(unmap_va, seg_size - final_size);
-
-							fd = open(hp->filepath, O_RDWR);
-							if (fd < 0) {
-								RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
-										hp->filepath, strerror(errno));
-								return -1;
-							}
-							if (ftruncate(fd, final_size) < 0) {
-								RTE_LOG(ERR, EAL, "Cannot truncate %s: %s\n",
-										hp->filepath, strerror(errno));
-								return -1;
-							}
-							close(fd);
-
-							pages_found += nr_pg_left;
-							hp->repeated = nr_pg_left;
-						}
-					}
-#else
-					/* else, lock the page and skip */
-					else
+					} else {
+						/* lock the page and skip */
 						pages_found++;
-#endif
+					}
 
 				} /* match page */
 			} /* foreach page */
@@ -1177,9 +950,6 @@ rte_eal_hugepage_init(void)
 	int i, j, new_memseg;
 	int nr_hugefiles, nr_hugepages = 0;
 	void *addr;
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-	int new_pages_count[MAX_HUGEPAGE_SIZES];
-#endif
 
 	test_proc_pagemap_readable();
 
@@ -1260,13 +1030,6 @@ rte_eal_hugepage_init(void)
 		pages_old = hpi->num_pages[0];
 		pages_new = map_all_hugepages(&tmp_hp[hp_offset], hpi, 1);
 		if (pages_new < pages_old) {
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-			RTE_LOG(ERR, EAL,
-				"%d not %d hugepages of size %u MB allocated\n",
-				pages_new, pages_old,
-				(unsigned)(hpi->hugepage_sz / 0x100000));
-			goto fail;
-#else
 			RTE_LOG(DEBUG, EAL,
 				"%d not %d hugepages of size %u MB allocated\n",
 				pages_new, pages_old,
@@ -1278,7 +1041,6 @@ rte_eal_hugepage_init(void)
 			hpi->num_pages[0] = pages_new;
 			if (pages_new == 0)
 				continue;
-#endif
 		}
 
 		/* find physical addresses and sockets for each hugepage */
@@ -1297,18 +1059,6 @@ rte_eal_hugepage_init(void)
 		qsort(&tmp_hp[hp_offset], hpi->num_pages[0],
 		      sizeof(struct hugepage_file), cmp_physaddr);
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-		/* remap all hugepages into single file segments */
-		new_pages_count[i] = remap_all_hugepages(&tmp_hp[hp_offset], hpi);
-		if (new_pages_count[i] < 0){
-			RTE_LOG(DEBUG, EAL, "Failed to remap %u MB pages\n",
-					(unsigned)(hpi->hugepage_sz / 0x100000));
-			goto fail;
-		}
-
-		/* we have processed a num of hugepages of this size, so inc offset */
-		hp_offset += new_pages_count[i];
-#else
 		/* remap all hugepages */
 		if (map_all_hugepages(&tmp_hp[hp_offset], hpi, 0) !=
 		    hpi->num_pages[0]) {
@@ -1323,7 +1073,6 @@ rte_eal_hugepage_init(void)
 
 		/* we have processed a num of hugepages of this size, so inc offset */
 		hp_offset += hpi->num_pages[0];
-#endif
 	}
 
 	huge_recover_sigbus();
@@ -1331,14 +1080,7 @@ rte_eal_hugepage_init(void)
 	if (internal_config.memory == 0 && internal_config.force_sockets == 0)
 		internal_config.memory = eal_get_hugepage_mem_size();
 
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-	nr_hugefiles = 0;
-	for (i = 0; i < (int) internal_config.num_hugepage_sizes; i++) {
-		nr_hugefiles += new_pages_count[i];
-	}
-#else
 	nr_hugefiles = nr_hugepages;
-#endif
 
 
 	/* clean out the numbers of pages */
@@ -1356,12 +1098,7 @@ rte_eal_hugepage_init(void)
 		for (j = 0; j < nb_hpsizes; j++) {
 			if (tmp_hp[i].size ==
 					internal_config.hugepage_info[j].hugepage_sz) {
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-					internal_config.hugepage_info[j].num_pages[socket] +=
-						tmp_hp[i].repeated;
-#else
 				internal_config.hugepage_info[j].num_pages[socket]++;
-#endif
 			}
 		}
 	}
@@ -1475,11 +1212,7 @@ rte_eal_hugepage_init(void)
 
 			mcfg->memseg[j].phys_addr = hugepage[i].physaddr;
 			mcfg->memseg[j].addr = hugepage[i].final_va;
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-			mcfg->memseg[j].len = hugepage[i].size * hugepage[i].repeated;
-#else
 			mcfg->memseg[j].len = hugepage[i].size;
-#endif
 			mcfg->memseg[j].socket_id = hugepage[i].socket_id;
 			mcfg->memseg[j].hugepage_sz = hugepage[i].size;
 		}
@@ -1646,11 +1379,7 @@ rte_eal_hugepage_attach(void)
 						hp[i].filepath);
 					goto error;
 				}
-#ifdef RTE_EAL_SINGLE_FILE_SEGMENTS
-				mapping_size = hp[i].size * hp[i].repeated;
-#else
 				mapping_size = hp[i].size;
-#endif
 				addr = mmap(RTE_PTR_ADD(base_addr, offset),
 						mapping_size, PROT_READ | PROT_WRITE,
 						MAP_SHARED, fd, 0);
-- 
1.9.0