| /* |
| * QEMU sPAPR Dynamic DMA windows support |
| * |
| * Copyright (c) 2015 Alexey Kardashevskiy, IBM Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, |
| * or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu/error-report.h" |
| #include "qemu/module.h" |
| #include "hw/ppc/spapr.h" |
| #include "hw/pci-host/spapr.h" |
| #include "trace.h" |
| |
| static int spapr_phb_get_active_win_num_cb(Object *child, void *opaque) |
| { |
| SpaprTceTable *tcet; |
| |
| tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); |
| if (tcet && tcet->nb_table) { |
| ++*(unsigned *)opaque; |
| } |
| return 0; |
| } |
| |
| static unsigned spapr_phb_get_active_win_num(SpaprPhbState *sphb) |
| { |
| unsigned ret = 0; |
| |
| object_child_foreach(OBJECT(sphb), spapr_phb_get_active_win_num_cb, &ret); |
| |
| return ret; |
| } |
| |
| static int spapr_phb_get_free_liobn_cb(Object *child, void *opaque) |
| { |
| SpaprTceTable *tcet; |
| |
| tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); |
| if (tcet && !tcet->nb_table) { |
| *(uint32_t *)opaque = tcet->liobn; |
| return 1; |
| } |
| return 0; |
| } |
| |
| static unsigned spapr_phb_get_free_liobn(SpaprPhbState *sphb) |
| { |
| uint32_t liobn = 0; |
| |
| object_child_foreach(OBJECT(sphb), spapr_phb_get_free_liobn_cb, &liobn); |
| |
| return liobn; |
| } |
| |
| static uint32_t spapr_page_mask_to_query_mask(uint64_t page_mask) |
| { |
| int i; |
| uint32_t mask = 0; |
| const struct { int shift; uint32_t mask; } masks[] = { |
| { 12, RTAS_DDW_PGSIZE_4K }, |
| { 16, RTAS_DDW_PGSIZE_64K }, |
| { 21, RTAS_DDW_PGSIZE_2M }, |
| { 24, RTAS_DDW_PGSIZE_16M }, |
| { 25, RTAS_DDW_PGSIZE_32M }, |
| { 26, RTAS_DDW_PGSIZE_64M }, |
| { 27, RTAS_DDW_PGSIZE_128M }, |
| { 28, RTAS_DDW_PGSIZE_256M }, |
| { 34, RTAS_DDW_PGSIZE_16G }, |
| }; |
| |
| for (i = 0; i < ARRAY_SIZE(masks); ++i) { |
| if (page_mask & (1ULL << masks[i].shift)) { |
| mask |= masks[i].mask; |
| } |
| } |
| |
| return mask; |
| } |
| |
| static void rtas_ibm_query_pe_dma_window(PowerPCCPU *cpu, |
| SpaprMachineState *spapr, |
| uint32_t token, uint32_t nargs, |
| target_ulong args, |
| uint32_t nret, target_ulong rets) |
| { |
| SpaprPhbState *sphb; |
| uint64_t buid; |
| uint32_t avail, addr, pgmask = 0; |
| |
| if ((nargs != 3) || ((nret != 5) && (nret != 6))) { |
| goto param_error_exit; |
| } |
| |
| buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
| addr = rtas_ld(args, 0); |
| sphb = spapr_pci_find_phb(spapr, buid); |
| if (!sphb || !sphb->ddw_enabled) { |
| goto param_error_exit; |
| } |
| |
| /* Translate page mask to LoPAPR format */ |
| pgmask = spapr_page_mask_to_query_mask(sphb->page_size_mask); |
| |
| avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb); |
| |
| rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| rtas_st(rets, 1, avail); |
| if (nret == 6) { |
| /* |
| * Set the Max TCE number as 1<<(58-21) = 0x20.0000.0000 |
| * 1<<59 is the huge window start and 21 is 2M page shift. |
| */ |
| rtas_st(rets, 2, 0x00000020); |
| rtas_st(rets, 3, 0x00000000); |
| rtas_st(rets, 4, pgmask); |
| rtas_st(rets, 5, 0); /* DMA migration mask, not supported */ |
| } else { |
| rtas_st(rets, 2, 0x80000000); |
| rtas_st(rets, 3, pgmask); |
| rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ |
| } |
| |
| trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask); |
| return; |
| |
| param_error_exit: |
| rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| } |
| |
| static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, |
| SpaprMachineState *spapr, |
| uint32_t token, uint32_t nargs, |
| target_ulong args, |
| uint32_t nret, target_ulong rets) |
| { |
| SpaprPhbState *sphb; |
| SpaprTceTable *tcet = NULL; |
| uint32_t addr, page_shift, window_shift, liobn; |
| uint64_t buid, win_addr; |
| int windows; |
| |
| if ((nargs != 5) || (nret != 4)) { |
| goto param_error_exit; |
| } |
| |
| buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
| addr = rtas_ld(args, 0); |
| sphb = spapr_pci_find_phb(spapr, buid); |
| if (!sphb || !sphb->ddw_enabled) { |
| goto param_error_exit; |
| } |
| |
| page_shift = rtas_ld(args, 3); |
| window_shift = rtas_ld(args, 4); |
| liobn = spapr_phb_get_free_liobn(sphb); |
| windows = spapr_phb_get_active_win_num(sphb); |
| |
| if (!(sphb->page_size_mask & (1ULL << page_shift)) || |
| (window_shift < page_shift)) { |
| goto param_error_exit; |
| } |
| |
| if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { |
| goto hw_error_exit; |
| } |
| |
| tcet = spapr_tce_find_by_liobn(liobn); |
| if (!tcet) { |
| goto hw_error_exit; |
| } |
| |
| win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; |
| /* |
| * We have just created a window, we know for the fact that it is empty, |
| * use a hack to avoid iterating over the table as it is quite possible |
| * to have billions of TCEs, all empty. |
| * Note that we cannot delay this to the first H_PUT_TCE as this hcall is |
| * mostly likely to be handled in KVM so QEMU just does not know if it |
| * happened. |
| */ |
| tcet->skipping_replay = true; |
| spapr_tce_table_enable(tcet, page_shift, win_addr, |
| 1ULL << (window_shift - page_shift)); |
| tcet->skipping_replay = false; |
| if (!tcet->nb_table) { |
| goto hw_error_exit; |
| } |
| |
| trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, |
| 1ULL << window_shift, tcet->bus_offset, liobn); |
| |
| rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| rtas_st(rets, 1, liobn); |
| rtas_st(rets, 2, tcet->bus_offset >> 32); |
| rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); |
| |
| return; |
| |
| hw_error_exit: |
| rtas_st(rets, 0, RTAS_OUT_HW_ERROR); |
| return; |
| |
| param_error_exit: |
| rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| } |
| |
| static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, |
| SpaprMachineState *spapr, |
| uint32_t token, uint32_t nargs, |
| target_ulong args, |
| uint32_t nret, target_ulong rets) |
| { |
| SpaprPhbState *sphb; |
| SpaprTceTable *tcet; |
| uint32_t liobn; |
| bool def_win_removed; |
| |
| if ((nargs != 1) || (nret != 1)) { |
| goto param_error_exit; |
| } |
| |
| liobn = rtas_ld(args, 0); |
| tcet = spapr_tce_find_by_liobn(liobn); |
| if (!tcet) { |
| goto param_error_exit; |
| } |
| |
| sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); |
| if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { |
| goto param_error_exit; |
| } |
| |
| def_win_removed = tcet->def_win; |
| spapr_tce_table_disable(tcet); |
| trace_spapr_iommu_ddw_remove(liobn); |
| |
| /* |
| * PAPR+/LoPAPR says: |
| * The platform must restore the default DMA window for the PE on a call |
| * to the ibm,remove-pe-dma-window RTAS call when all of the following |
| * are true: |
| * a. The call removes the last DMA window remaining for the PE. |
| * b. The DMA window being removed is not the default window |
| */ |
| if (spapr_phb_get_active_win_num(sphb) == 0 && !def_win_removed) { |
| spapr_phb_dma_reset(sphb); |
| trace_spapr_iommu_ddw_reset(sphb->buid, 0); |
| } |
| |
| rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| return; |
| |
| param_error_exit: |
| rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| } |
| |
| static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, |
| SpaprMachineState *spapr, |
| uint32_t token, uint32_t nargs, |
| target_ulong args, |
| uint32_t nret, target_ulong rets) |
| { |
| SpaprPhbState *sphb; |
| uint64_t buid; |
| uint32_t addr; |
| |
| if ((nargs != 3) || (nret != 1)) { |
| goto param_error_exit; |
| } |
| |
| buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
| addr = rtas_ld(args, 0); |
| sphb = spapr_pci_find_phb(spapr, buid); |
| if (!sphb || !sphb->ddw_enabled) { |
| goto param_error_exit; |
| } |
| |
| spapr_phb_dma_reset(sphb); |
| trace_spapr_iommu_ddw_reset(buid, addr); |
| |
| rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| |
| return; |
| |
| param_error_exit: |
| rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| } |
| |
| static void spapr_rtas_ddw_init(void) |
| { |
| spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, |
| "ibm,query-pe-dma-window", |
| rtas_ibm_query_pe_dma_window); |
| spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, |
| "ibm,create-pe-dma-window", |
| rtas_ibm_create_pe_dma_window); |
| spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, |
| "ibm,remove-pe-dma-window", |
| rtas_ibm_remove_pe_dma_window); |
| spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, |
| "ibm,reset-pe-dma-window", |
| rtas_ibm_reset_pe_dma_window); |
| } |
| |
| type_init(spapr_rtas_ddw_init) |
