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qemu/hw/ppc/spapr_rtas_ddw.c

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/*
* 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 "cpu.h"
#include "qemu/error-report.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 },
{ 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)) {
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);
rtas_st(rets, 2, 0x80000000); /* The largest window we can possibly have */
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;
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;
}
spapr_tce_table_disable(tcet);
trace_spapr_iommu_ddw_remove(liobn);
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)
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