diff options
Diffstat (limited to 'drivers/infiniband/hw/ehca/ehca_mrmw.c')
| -rw-r--r-- | drivers/infiniband/hw/ehca/ehca_mrmw.c | 508 |
1 files changed, 495 insertions, 13 deletions
diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.c b/drivers/infiniband/hw/ehca/ehca_mrmw.c index 72f83f7df614..7663a2a9f130 100644 --- a/drivers/infiniband/hw/ehca/ehca_mrmw.c +++ b/drivers/infiniband/hw/ehca/ehca_mrmw.c @@ -53,6 +53,38 @@ /* max number of rpages (per hcall register_rpages) */ #define MAX_RPAGES 512 +/* DMEM toleration management */ +#define EHCA_SECTSHIFT SECTION_SIZE_BITS +#define EHCA_SECTSIZE (1UL << EHCA_SECTSHIFT) +#define EHCA_HUGEPAGESHIFT 34 +#define EHCA_HUGEPAGE_SIZE (1UL << EHCA_HUGEPAGESHIFT) +#define EHCA_HUGEPAGE_PFN_MASK ((EHCA_HUGEPAGE_SIZE - 1) >> PAGE_SHIFT) +#define EHCA_INVAL_ADDR 0xFFFFFFFFFFFFFFFFULL +#define EHCA_DIR_INDEX_SHIFT 13 /* 8k Entries in 64k block */ +#define EHCA_TOP_INDEX_SHIFT (EHCA_DIR_INDEX_SHIFT * 2) +#define EHCA_MAP_ENTRIES (1 << EHCA_DIR_INDEX_SHIFT) +#define EHCA_TOP_MAP_SIZE (0x10000) /* currently fixed map size */ +#define EHCA_DIR_MAP_SIZE (0x10000) +#define EHCA_ENT_MAP_SIZE (0x10000) +#define EHCA_INDEX_MASK (EHCA_MAP_ENTRIES - 1) + +static unsigned long ehca_mr_len; + +/* + * Memory map data structures + */ +struct ehca_dir_bmap { + u64 ent[EHCA_MAP_ENTRIES]; +}; +struct ehca_top_bmap { + struct ehca_dir_bmap *dir[EHCA_MAP_ENTRIES]; +}; +struct ehca_bmap { + struct ehca_top_bmap *top[EHCA_MAP_ENTRIES]; +}; + +static struct ehca_bmap *ehca_bmap; + static struct kmem_cache *mr_cache; static struct kmem_cache *mw_cache; @@ -68,6 +100,8 @@ enum ehca_mr_pgsize { #define EHCA_MR_PGSHIFT1M 20 #define EHCA_MR_PGSHIFT16M 24 +static u64 ehca_map_vaddr(void *caddr); + static u32 ehca_encode_hwpage_size(u32 pgsize) { int log = ilog2(pgsize); @@ -135,7 +169,8 @@ struct ib_mr *ehca_get_dma_mr(struct ib_pd *pd, int mr_access_flags) goto get_dma_mr_exit0; } - ret = ehca_reg_maxmr(shca, e_maxmr, (u64 *)KERNELBASE, + ret = ehca_reg_maxmr(shca, e_maxmr, + (void *)ehca_map_vaddr((void *)KERNELBASE), mr_access_flags, e_pd, &e_maxmr->ib.ib_mr.lkey, &e_maxmr->ib.ib_mr.rkey); @@ -251,7 +286,7 @@ struct ib_mr *ehca_reg_phys_mr(struct ib_pd *pd, ret = ehca_reg_mr(shca, e_mr, iova_start, size, mr_access_flags, e_pd, &pginfo, &e_mr->ib.ib_mr.lkey, - &e_mr->ib.ib_mr.rkey); + &e_mr->ib.ib_mr.rkey, EHCA_REG_MR); if (ret) { ib_mr = ERR_PTR(ret); goto reg_phys_mr_exit1; @@ -370,7 +405,7 @@ reg_user_mr_fallback: ret = ehca_reg_mr(shca, e_mr, (u64 *)virt, length, mr_access_flags, e_pd, &pginfo, &e_mr->ib.ib_mr.lkey, - &e_mr->ib.ib_mr.rkey); + &e_mr->ib.ib_mr.rkey, EHCA_REG_MR); if (ret == -EINVAL && pginfo.hwpage_size > PAGE_SIZE) { ehca_warn(pd->device, "failed to register mr " "with hwpage_size=%llx", hwpage_size); @@ -794,7 +829,7 @@ struct ib_fmr *ehca_alloc_fmr(struct ib_pd *pd, ret = ehca_reg_mr(shca, e_fmr, NULL, fmr_attr->max_pages * (1 << fmr_attr->page_shift), mr_access_flags, e_pd, &pginfo, - &tmp_lkey, &tmp_rkey); + &tmp_lkey, &tmp_rkey, EHCA_REG_MR); if (ret) { ib_fmr = ERR_PTR(ret); goto alloc_fmr_exit1; @@ -983,6 +1018,10 @@ free_fmr_exit0: /*----------------------------------------------------------------------*/ +static int ehca_reg_bmap_mr_rpages(struct ehca_shca *shca, + struct ehca_mr *e_mr, + struct ehca_mr_pginfo *pginfo); + int ehca_reg_mr(struct ehca_shca *shca, struct ehca_mr *e_mr, u64 *iova_start, @@ -991,7 +1030,8 @@ int ehca_reg_mr(struct ehca_shca *shca, struct ehca_pd *e_pd, struct ehca_mr_pginfo *pginfo, u32 *lkey, /*OUT*/ - u32 *rkey) /*OUT*/ + u32 *rkey, /*OUT*/ + enum ehca_reg_type reg_type) { int ret; u64 h_ret; @@ -1015,7 +1055,13 @@ int ehca_reg_mr(struct ehca_shca *shca, e_mr->ipz_mr_handle = hipzout.handle; - ret = ehca_reg_mr_rpages(shca, e_mr, pginfo); + if (reg_type == EHCA_REG_BUSMAP_MR) + ret = ehca_reg_bmap_mr_rpages(shca, e_mr, pginfo); + else if (reg_type == EHCA_REG_MR) + ret = ehca_reg_mr_rpages(shca, e_mr, pginfo); + else + ret = -EINVAL; + if (ret) goto ehca_reg_mr_exit1; @@ -1316,7 +1362,7 @@ int ehca_rereg_mr(struct ehca_shca *shca, e_mr->fmr_map_cnt = save_mr.fmr_map_cnt; ret = ehca_reg_mr(shca, e_mr, iova_start, size, acl, - e_pd, pginfo, lkey, rkey); + e_pd, pginfo, lkey, rkey, EHCA_REG_MR); if (ret) { u32 offset = (u64)(&e_mr->flags) - (u64)e_mr; memcpy(&e_mr->flags, &(save_mr.flags), @@ -1409,7 +1455,7 @@ int ehca_unmap_one_fmr(struct ehca_shca *shca, ret = ehca_reg_mr(shca, e_fmr, NULL, (e_fmr->fmr_max_pages * e_fmr->fmr_page_size), e_fmr->acl, e_pd, &pginfo, &tmp_lkey, - &tmp_rkey); + &tmp_rkey, EHCA_REG_MR); if (ret) { u32 offset = (u64)(&e_fmr->flags) - (u64)e_fmr; memcpy(&e_fmr->flags, &(save_mr.flags), @@ -1478,6 +1524,90 @@ ehca_reg_smr_exit0: } /* end ehca_reg_smr() */ /*----------------------------------------------------------------------*/ +static inline void *ehca_calc_sectbase(int top, int dir, int idx) +{ + unsigned long ret = idx; + ret |= dir << EHCA_DIR_INDEX_SHIFT; + ret |= top << EHCA_TOP_INDEX_SHIFT; + return abs_to_virt(ret << SECTION_SIZE_BITS); +} + +#define ehca_bmap_valid(entry) \ + ((u64)entry != (u64)EHCA_INVAL_ADDR) + +static u64 ehca_reg_mr_section(int top, int dir, int idx, u64 *kpage, + struct ehca_shca *shca, struct ehca_mr *mr, + struct ehca_mr_pginfo *pginfo) +{ + u64 h_ret = 0; + unsigned long page = 0; + u64 rpage = virt_to_abs(kpage); + int page_count; + + void *sectbase = ehca_calc_sectbase(top, dir, idx); + if ((unsigned long)sectbase & (pginfo->hwpage_size - 1)) { + ehca_err(&shca->ib_device, "reg_mr_section will probably fail:" + "hwpage_size does not fit to " + "section start address"); + } + page_count = EHCA_SECTSIZE / pginfo->hwpage_size; + + while (page < page_count) { + u64 rnum; + for (rnum = 0; (rnum < MAX_RPAGES) && (page < page_count); + rnum++) { + void *pg = sectbase + ((page++) * pginfo->hwpage_size); + kpage[rnum] = virt_to_abs(pg); + } + + h_ret = hipz_h_register_rpage_mr(shca->ipz_hca_handle, mr, + ehca_encode_hwpage_size(pginfo->hwpage_size), + 0, rpage, rnum); + + if ((h_ret != H_SUCCESS) && (h_ret != H_PAGE_REGISTERED)) { + ehca_err(&shca->ib_device, "register_rpage_mr failed"); + return h_ret; + } + } + return h_ret; +} + +static u64 ehca_reg_mr_sections(int top, int dir, u64 *kpage, + struct ehca_shca *shca, struct ehca_mr *mr, + struct ehca_mr_pginfo *pginfo) +{ + u64 hret = H_SUCCESS; + int idx; + + for (idx = 0; idx < EHCA_MAP_ENTRIES; idx++) { + if (!ehca_bmap_valid(ehca_bmap->top[top]->dir[dir]->ent[idx])) + continue; + + hret = ehca_reg_mr_section(top, dir, idx, kpage, shca, mr, + pginfo); + if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED)) + return hret; + } + return hret; +} + +static u64 ehca_reg_mr_dir_sections(int top, u64 *kpage, struct ehca_shca *shca, + struct ehca_mr *mr, + struct ehca_mr_pginfo *pginfo) +{ + u64 hret = H_SUCCESS; + int dir; + + for (dir = 0; dir < EHCA_MAP_ENTRIES; dir++) { + if (!ehca_bmap_valid(ehca_bmap->top[top]->dir[dir])) + continue; + + hret = ehca_reg_mr_sections(top, dir, kpage, shca, mr, pginfo); + if ((hret != H_SUCCESS) && (hret != H_PAGE_REGISTERED)) + return hret; + } + return hret; +} /* register internal max-MR to internal SHCA */ int ehca_reg_internal_maxmr( @@ -1495,6 +1625,11 @@ int ehca_reg_internal_maxmr( u32 num_hwpages; u64 hw_pgsize; + if (!ehca_bmap) { + ret = -EFAULT; + goto ehca_reg_internal_maxmr_exit0; + } + e_mr = ehca_mr_new(); if (!e_mr) { ehca_err(&shca->ib_device, "out of memory"); @@ -1504,8 +1639,8 @@ int ehca_reg_internal_maxmr( e_mr->flags |= EHCA_MR_FLAG_MAXMR; /* register internal max-MR on HCA */ - size_maxmr = (u64)high_memory - PAGE_OFFSET; - iova_start = (u64 *)KERNELBASE; + size_maxmr = ehca_mr_len; + iova_start = (u64 *)ehca_map_vaddr((void *)KERNELBASE); ib_pbuf.addr = 0; ib_pbuf.size = size_maxmr; num_kpages = NUM_CHUNKS(((u64)iova_start % PAGE_SIZE) + size_maxmr, @@ -1524,7 +1659,7 @@ int ehca_reg_internal_maxmr( ret = ehca_reg_mr(shca, e_mr, iova_start, size_maxmr, 0, e_pd, &pginfo, &e_mr->ib.ib_mr.lkey, - &e_mr->ib.ib_mr.rkey); + &e_mr->ib.ib_mr.rkey, EHCA_REG_BUSMAP_MR); if (ret) { ehca_err(&shca->ib_device, "reg of internal max MR failed, " "e_mr=%p iova_start=%p size_maxmr=%llx num_kpages=%x " @@ -2077,8 +2212,8 @@ int ehca_mr_is_maxmr(u64 size, u64 *iova_start) { /* a MR is treated as max-MR only if it fits following: */ - if ((size == ((u64)high_memory - PAGE_OFFSET)) && - (iova_start == (void *)KERNELBASE)) { + if ((size == ehca_mr_len) && + (iova_start == (void *)ehca_map_vaddr((void *)KERNELBASE))) { ehca_gen_dbg("this is a max-MR"); return 1; } else @@ -2184,3 +2319,350 @@ void ehca_cleanup_mrmw_cache(void) if (mw_cache) kmem_cache_destroy(mw_cache); } + +static inline int ehca_init_top_bmap(struct ehca_top_bmap *ehca_top_bmap, + int dir) +{ + if (!ehca_bmap_valid(ehca_top_bmap->dir[dir])) { + ehca_top_bmap->dir[dir] = + kmalloc(sizeof(struct ehca_dir_bmap), GFP_KERNEL); + if (!ehca_top_bmap->dir[dir]) + return -ENOMEM; + /* Set map block to 0xFF according to EHCA_INVAL_ADDR */ + memset(ehca_top_bmap->dir[dir], 0xFF, EHCA_ENT_MAP_SIZE); + } + return 0; +} + +static inline int ehca_init_bmap(struct ehca_bmap *ehca_bmap, int top, int dir) +{ + if (!ehca_bmap_valid(ehca_bmap->top[top])) { + ehca_bmap->top[top] = + kmalloc(sizeof(struct ehca_top_bmap), GFP_KERNEL); + if (!ehca_bmap->top[top]) + return -ENOMEM; + /* Set map block to 0xFF according to EHCA_INVAL_ADDR */ + memset(ehca_bmap->top[top], 0xFF, EHCA_DIR_MAP_SIZE); + } + return ehca_init_top_bmap(ehca_bmap->top[top], dir); +} + +static inline int ehca_calc_index(unsigned long i, unsigned long s) +{ + return (i >> s) & EHCA_INDEX_MASK; +} + +void ehca_destroy_busmap(void) +{ + int top, dir; + + if (!ehca_bmap) + return; + + for (top = 0; top < EHCA_MAP_ENTRIES; top++) { + if (!ehca_bmap_valid(ehca_bmap->top[top])) + continue; + for (dir = 0; dir < EHCA_MAP_ENTRIES; dir++) { + if (!ehca_bmap_valid(ehca_bmap->top[top]->dir[dir])) + continue; + + kfree(ehca_bmap->top[top]->dir[dir]); + } + + kfree(ehca_bmap->top[top]); + } + + kfree(ehca_bmap); + ehca_bmap = NULL; +} + +static int ehca_update_busmap(unsigned long pfn, unsigned long nr_pages) +{ + unsigned long i, start_section, end_section; + int top, dir, idx; + + if (!nr_pages) + return 0; + + if (!ehca_bmap) { + ehca_bmap = kmalloc(sizeof(struct ehca_bmap), GFP_KERNEL); + if (!ehca_bmap) + return -ENOMEM; + /* Set map block to 0xFF according to EHCA_INVAL_ADDR */ + memset(ehca_bmap, 0xFF, EHCA_TOP_MAP_SIZE); + } + + start_section = phys_to_abs(pfn * PAGE_SIZE) / EHCA_SECTSIZE; + end_section = phys_to_abs((pfn + nr_pages) * PAGE_SIZE) / EHCA_SECTSIZE; + for (i = start_section; i < end_section; i++) { + int ret; + top = ehca_calc_index(i, EHCA_TOP_INDEX_SHIFT); + dir = ehca_calc_index(i, EHCA_DIR_INDEX_SHIFT); + idx = i & EHCA_INDEX_MASK; + + ret = ehca_init_bmap(ehca_bmap, top, dir); + if (ret) { + ehca_destroy_busmap(); + return ret; + } + ehca_bmap->top[top]->dir[dir]->ent[idx] = ehca_mr_len; + ehca_mr_len += EHCA_SECTSIZE; + } + return 0; +} + +static int ehca_is_hugepage(unsigned long pfn) +{ + int page_order; + + if (pfn & EHCA_HUGEPAGE_PFN_MASK) + return 0; + + page_order = compound_order(pfn_to_page(pfn)); + if (page_order + PAGE_SHIFT != EHCA_HUGEPAGESHIFT) + return 0; + + return 1; +} + +static int ehca_create_busmap_callback(unsigned long initial_pfn, + unsigned long total_nr_pages, void *arg) +{ + int ret; + unsigned long pfn, start_pfn, end_pfn, nr_pages; + + if ((total_nr_pages * PAGE_SIZE) < EHCA_HUGEPAGE_SIZE) + return ehca_update_busmap(initial_pfn, total_nr_pages); + + /* Given chunk is >= 16GB -> check for hugepages */ + start_pfn = initial_pfn; + end_pfn = initial_pfn + total_nr_pages; + pfn = start_pfn; + + while (pfn < end_pfn) { + if (ehca_is_hugepage(pfn)) { + /* Add mem found in front of the hugepage */ + nr_pages = pfn - start_pfn; + ret = ehca_update_busmap(start_pfn, nr_pages); + if (ret) + return ret; + /* Skip the hugepage */ + pfn += (EHCA_HUGEPAGE_SIZE / PAGE_SIZE); + start_pfn = pfn; + } else + pfn += (EHCA_SECTSIZE / PAGE_SIZE); + } + + /* Add mem found behind the hugepage(s) */ + nr_pages = pfn - start_pfn; + return ehca_update_busmap(start_pfn, nr_pages); +} + +int ehca_create_busmap(void) +{ + int ret; + + ehca_mr_len = 0; + ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, NULL, + ehca_create_busmap_callback); + return ret; +} + +static int ehca_reg_bmap_mr_rpages(struct ehca_shca *shca, + struct ehca_mr *e_mr, + struct ehca_mr_pginfo *pginfo) +{ + int top; + u64 hret, *kpage; + + kpage = ehca_alloc_fw_ctrlblock(GFP_KERNEL); + if (!kpage) { + ehca_err(&shca->ib_device, "kpage alloc failed"); + return -ENOMEM; + } + for (top = 0; top < EHCA_MAP_ENTRIES; top++) { + if (!ehca_bmap_valid(ehca_bmap->top[top])) + continue; + hret = ehca_reg_mr_dir_sections(top, kpage, shca, e_mr, pginfo); + if ((hret != H_PAGE_REGISTERED) && (hret != H_SUCCESS)) + break; + } + + ehca_free_fw_ctrlblock(kpage); + + if (hret == H_SUCCESS) + return 0; /* Everything is fine */ + else { + ehca_err(&shca->ib_device, "ehca_reg_bmap_mr_rpages failed, " + "h_ret=%lli e_mr=%p top=%x lkey=%x " + "hca_hndl=%llx mr_hndl=%llx", hret, e_mr, top, + e_mr->ib.ib_mr.lkey, + shca->ipz_hca_handle.handle, + e_mr->ipz_mr_handle.handle); + return ehca2ib_return_code(hret); + } +} + +static u64 ehca_map_vaddr(void *caddr) +{ + int top, dir, idx; + unsigned long abs_addr, offset; + u64 entry; + + if (!ehca_bmap) + return EHCA_INVAL_ADDR; + + abs_addr = virt_to_abs(caddr); + top = ehca_calc_index(abs_addr, EHCA_TOP_INDEX_SHIFT + EHCA_SECTSHIFT); + if (!ehca_bmap_valid(ehca_bmap->top[top])) + return EHCA_INVAL_ADDR; + + dir = ehca_calc_index(abs_addr, EHCA_DIR_INDEX_SHIFT + EHCA_SECTSHIFT); + if (!ehca_bmap_valid(ehca_bmap->top[top]->dir[dir])) + return EHCA_INVAL_ADDR; + + idx = ehca_calc_index(abs_addr, EHCA_SECTSHIFT); + + entry = ehca_bmap->top[top]->dir[dir]->ent[idx]; + if (ehca_bmap_valid(entry)) { + offset = (unsigned long)caddr & (EHCA_SECTSIZE - 1); + return entry | offset; + } else + return EHCA_INVAL_ADDR; +} + +static int ehca_dma_mapping_error(struct ib_device *dev, u64 dma_addr) +{ + return dma_addr == EHCA_INVAL_ADDR; +} + +static u64 ehca_dma_map_single(struct ib_device *dev, void *cpu_addr, + size_t size, enum dma_data_direction direction) +{ + if (cpu_addr) + return ehca_map_vaddr(cpu_addr); + else + return EHCA_INVAL_ADDR; +} + +static void ehca_dma_unmap_single(struct ib_device *dev, u64 addr, size_t size, + enum dma_data_direction direction) +{ + /* This is only a stub; nothing to be done here */ +} + +static u64 ehca_dma_map_page(struct ib_device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction direction) +{ + u64 addr; + + if (offset + size > PAGE_SIZE) + return EHCA_INVAL_ADDR; + + addr = ehca_map_vaddr(page_address(page)); + if (!ehca_dma_mapping_error(dev, addr)) + addr += offset; + + return addr; +} + +static void ehca_dma_unmap_page(struct ib_device *dev, u64 addr, size_t size, + enum dma_data_direction direction) +{ + /* This is only a stub; nothing to be done here */ +} + +static int ehca_dma_map_sg(struct ib_device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction direction) +{ + struct scatterlist *sg; + int i; + + for_each_sg(sgl, sg, nents, i) { + u64 addr; + addr = ehca_map_vaddr(sg_virt(sg)); + if (ehca_dma_mapping_error(dev, addr)) + return 0; + + sg->dma_address = addr; + sg->dma_length = sg->length; + } + return nents; +} + +static void ehca_dma_unmap_sg(struct ib_device *dev, struct scatterlist *sg, + int nents, enum dma_data_direction direction) +{ + /* This is only a stub; nothing to be done here */ +} + +static u64 ehca_dma_address(struct ib_device *dev, struct scatterlist *sg) +{ + return sg->dma_address; +} + +static unsigned int ehca_dma_len(struct ib_device *dev, struct scatterlist *sg) +{ + return sg->length; +} + +static void ehca_dma_sync_single_for_cpu(struct ib_device *dev, u64 addr, + size_t size, + enum dma_data_direction dir) +{ + dma_sync_single_for_cpu(dev->dma_device, addr, size, dir); +} + +static void ehca_dma_sync_single_for_device(struct ib_device *dev, u64 addr, + size_t size, + enum dma_data_direction dir) +{ + dma_sync_single_for_device(dev->dma_device, addr, size, dir); +} + +static void *ehca_dma_alloc_coherent(struct ib_device *dev, size_t size, + u64 *dma_handle, gfp_t flag) +{ + struct page *p; + void *addr = NULL; + u64 dma_addr; + + p = alloc_pages(flag, get_order(size)); + if (p) { + addr = page_address(p); + dma_addr = ehca_map_vaddr(addr); + if (ehca_dma_mapping_error(dev, dma_addr)) { + free_pages((unsigned long)addr, get_order(size)); + return NULL; + } + if (dma_handle) + *dma_handle = dma_addr; + return addr; + } + return NULL; +} + +static void ehca_dma_free_coherent(struct ib_device *dev, size_t size, + void *cpu_addr, u64 dma_handle) +{ + if (cpu_addr && size) + free_pages((unsigned long)cpu_addr, get_order(size)); +} + + +struct ib_dma_mapping_ops ehca_dma_mapping_ops = { + .mapping_error = ehca_dma_mapping_error, + .map_single = ehca_dma_map_single, + .unmap_single = ehca_dma_unmap_single, + .map_page = ehca_dma_map_page, + .unmap_page = ehca_dma_unmap_page, + .map_sg = ehca_dma_map_sg, + .unmap_sg = ehca_dma_unmap_sg, + .dma_address = ehca_dma_address, + .dma_len = ehca_dma_len, + .sync_single_for_cpu = ehca_dma_sync_single_for_cpu, + .sync_single_for_device = ehca_dma_sync_single_for_device, + .alloc_coherent = ehca_dma_alloc_coherent, + .free_coherent = ehca_dma_free_coherent, +}; 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