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Automatic merge of 'fixes-test' into merge-test (2024-02-26 17:03)
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@mpe
mpe committed Feb 26, 2024
2 parents 91ff6ca + fad87db commit c799898
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Showing 3 changed files with 114 additions and 55 deletions.
4 changes: 2 additions & 2 deletions arch/powerpc/include/asm/rtas.h
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@ enum rtas_function_index {
RTAS_FNIDX__IBM_READ_SLOT_RESET_STATE,
RTAS_FNIDX__IBM_READ_SLOT_RESET_STATE2,
RTAS_FNIDX__IBM_REMOVE_PE_DMA_WINDOW,
RTAS_FNIDX__IBM_RESET_PE_DMA_WINDOWS,
RTAS_FNIDX__IBM_RESET_PE_DMA_WINDOW,
RTAS_FNIDX__IBM_SCAN_LOG_DUMP,
RTAS_FNIDX__IBM_SET_DYNAMIC_INDICATOR,
RTAS_FNIDX__IBM_SET_EEH_OPTION,
Expand Down Expand Up @@ -164,7 +164,7 @@ typedef struct {
#define RTAS_FN_IBM_READ_SLOT_RESET_STATE rtas_fn_handle(RTAS_FNIDX__IBM_READ_SLOT_RESET_STATE)
#define RTAS_FN_IBM_READ_SLOT_RESET_STATE2 rtas_fn_handle(RTAS_FNIDX__IBM_READ_SLOT_RESET_STATE2)
#define RTAS_FN_IBM_REMOVE_PE_DMA_WINDOW rtas_fn_handle(RTAS_FNIDX__IBM_REMOVE_PE_DMA_WINDOW)
#define RTAS_FN_IBM_RESET_PE_DMA_WINDOWS rtas_fn_handle(RTAS_FNIDX__IBM_RESET_PE_DMA_WINDOWS)
#define RTAS_FN_IBM_RESET_PE_DMA_WINDOW rtas_fn_handle(RTAS_FNIDX__IBM_RESET_PE_DMA_WINDOW)
#define RTAS_FN_IBM_SCAN_LOG_DUMP rtas_fn_handle(RTAS_FNIDX__IBM_SCAN_LOG_DUMP)
#define RTAS_FN_IBM_SET_DYNAMIC_INDICATOR rtas_fn_handle(RTAS_FNIDX__IBM_SET_DYNAMIC_INDICATOR)
#define RTAS_FN_IBM_SET_EEH_OPTION rtas_fn_handle(RTAS_FNIDX__IBM_SET_EEH_OPTION)
Expand Down
9 changes: 7 additions & 2 deletions arch/powerpc/kernel/rtas.c
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Original file line number Diff line number Diff line change
Expand Up @@ -375,8 +375,13 @@ static struct rtas_function rtas_function_table[] __ro_after_init = {
[RTAS_FNIDX__IBM_REMOVE_PE_DMA_WINDOW] = {
.name = "ibm,remove-pe-dma-window",
},
[RTAS_FNIDX__IBM_RESET_PE_DMA_WINDOWS] = {
.name = "ibm,reset-pe-dma-windows",
[RTAS_FNIDX__IBM_RESET_PE_DMA_WINDOW] = {
/*
* Note: PAPR+ v2.13 7.3.31.4.1 spells this as
* "ibm,reset-pe-dma-windows" (plural), but RTAS
* implementations use the singular form in practice.
*/
.name = "ibm,reset-pe-dma-window",
},
[RTAS_FNIDX__IBM_SCAN_LOG_DUMP] = {
.name = "ibm,scan-log-dump",
Expand Down
156 changes: 105 additions & 51 deletions arch/powerpc/platforms/pseries/iommu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -574,29 +574,6 @@ static void iommu_table_setparms(struct pci_controller *phb,

struct iommu_table_ops iommu_table_lpar_multi_ops;

/*
* iommu_table_setparms_lpar
*
* Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
*/
static void iommu_table_setparms_lpar(struct pci_controller *phb,
struct device_node *dn,
struct iommu_table *tbl,
struct iommu_table_group *table_group,
const __be32 *dma_window)
{
unsigned long offset, size, liobn;

of_parse_dma_window(dn, dma_window, &liobn, &offset, &size);

iommu_table_setparms_common(tbl, phb->bus->number, liobn, offset, size, IOMMU_PAGE_SHIFT_4K, NULL,
&iommu_table_lpar_multi_ops);


table_group->tce32_start = offset;
table_group->tce32_size = size;
}

struct iommu_table_ops iommu_table_pseries_ops = {
.set = tce_build_pSeries,
.clear = tce_free_pSeries,
Expand Down Expand Up @@ -724,44 +701,92 @@ struct iommu_table_ops iommu_table_lpar_multi_ops = {
* dynamic 64bit DMA window, walking up the device tree.
*/
static struct device_node *pci_dma_find(struct device_node *dn,
const __be32 **dma_window)
struct dynamic_dma_window_prop *prop)
{
const __be32 *dw = NULL;
const __be32 *default_prop = NULL;
const __be32 *ddw_prop = NULL;
struct device_node *rdn = NULL;
bool default_win = false, ddw_win = false;

for ( ; dn && PCI_DN(dn); dn = dn->parent) {
dw = of_get_property(dn, "ibm,dma-window", NULL);
if (dw) {
if (dma_window)
*dma_window = dw;
return dn;
default_prop = of_get_property(dn, "ibm,dma-window", NULL);
if (default_prop) {
rdn = dn;
default_win = true;
}
ddw_prop = of_get_property(dn, DIRECT64_PROPNAME, NULL);
if (ddw_prop) {
rdn = dn;
ddw_win = true;
break;
}
ddw_prop = of_get_property(dn, DMA64_PROPNAME, NULL);
if (ddw_prop) {
rdn = dn;
ddw_win = true;
break;
}
dw = of_get_property(dn, DIRECT64_PROPNAME, NULL);
if (dw)
return dn;
dw = of_get_property(dn, DMA64_PROPNAME, NULL);
if (dw)
return dn;

/* At least found default window, which is the case for normal boot */
if (default_win)
break;
}

return NULL;
/* For PCI devices there will always be a DMA window, either on the device
* or parent bus
*/
WARN_ON(!(default_win | ddw_win));

/* caller doesn't want to get DMA window property */
if (!prop)
return rdn;

/* parse DMA window property. During normal system boot, only default
* DMA window is passed in OF. But, for kdump, a dedicated adapter might
* have both default and DDW in FDT. In this scenario, DDW takes precedence
* over default window.
*/
if (ddw_win) {
struct dynamic_dma_window_prop *p;

p = (struct dynamic_dma_window_prop *)ddw_prop;
prop->liobn = p->liobn;
prop->dma_base = p->dma_base;
prop->tce_shift = p->tce_shift;
prop->window_shift = p->window_shift;
} else if (default_win) {
unsigned long offset, size, liobn;

of_parse_dma_window(rdn, default_prop, &liobn, &offset, &size);

prop->liobn = cpu_to_be32((u32)liobn);
prop->dma_base = cpu_to_be64(offset);
prop->tce_shift = cpu_to_be32(IOMMU_PAGE_SHIFT_4K);
prop->window_shift = cpu_to_be32(order_base_2(size));
}

return rdn;
}

static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
{
struct iommu_table *tbl;
struct device_node *dn, *pdn;
struct pci_dn *ppci;
const __be32 *dma_window = NULL;
struct dynamic_dma_window_prop prop;

dn = pci_bus_to_OF_node(bus);

pr_debug("pci_dma_bus_setup_pSeriesLP: setting up bus %pOF\n",
dn);

pdn = pci_dma_find(dn, &dma_window);
pdn = pci_dma_find(dn, &prop);

if (dma_window == NULL)
pr_debug(" no ibm,dma-window property !\n");
/* In PPC architecture, there will always be DMA window on bus or one of the
* parent bus. During reboot, there will be ibm,dma-window property to
* define DMA window. For kdump, there will at least be default window or DDW
* or both.
*/

ppci = PCI_DN(pdn);

Expand All @@ -771,13 +796,24 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
if (!ppci->table_group) {
ppci->table_group = iommu_pseries_alloc_group(ppci->phb->node);
tbl = ppci->table_group->tables[0];
if (dma_window) {
iommu_table_setparms_lpar(ppci->phb, pdn, tbl,
ppci->table_group, dma_window);

if (!iommu_init_table(tbl, ppci->phb->node, 0, 0))
panic("Failed to initialize iommu table");
}
iommu_table_setparms_common(tbl, ppci->phb->bus->number,
be32_to_cpu(prop.liobn),
be64_to_cpu(prop.dma_base),
1ULL << be32_to_cpu(prop.window_shift),
be32_to_cpu(prop.tce_shift), NULL,
&iommu_table_lpar_multi_ops);

/* Only for normal boot with default window. Doesn't matter even
* if we set these with DDW which is 64bit during kdump, since
* these will not be used during kdump.
*/
ppci->table_group->tce32_start = be64_to_cpu(prop.dma_base);
ppci->table_group->tce32_size = 1 << be32_to_cpu(prop.window_shift);

if (!iommu_init_table(tbl, ppci->phb->node, 0, 0))
panic("Failed to initialize iommu table");

iommu_register_group(ppci->table_group,
pci_domain_nr(bus), 0);
pr_debug(" created table: %p\n", ppci->table_group);
Expand Down Expand Up @@ -968,6 +1004,12 @@ static void find_existing_ddw_windows_named(const char *name)
continue;
}

/* If at the time of system initialization, there are DDWs in OF,
* it means this is during kexec. DDW could be direct or dynamic.
* We will just mark DDWs as "dynamic" since this is kdump path,
* no need to worry about perforance. ddw_list_new_entry() will
* set window->direct = false.
*/
window = ddw_list_new_entry(pdn, dma64);
if (!window) {
of_node_put(pdn);
Expand Down Expand Up @@ -1524,8 +1566,8 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
{
struct device_node *pdn, *dn;
struct iommu_table *tbl;
const __be32 *dma_window = NULL;
struct pci_dn *pci;
struct dynamic_dma_window_prop prop;

pr_debug("pci_dma_dev_setup_pSeriesLP: %s\n", pci_name(dev));

Expand All @@ -1538,7 +1580,7 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
dn = pci_device_to_OF_node(dev);
pr_debug(" node is %pOF\n", dn);

pdn = pci_dma_find(dn, &dma_window);
pdn = pci_dma_find(dn, &prop);
if (!pdn || !PCI_DN(pdn)) {
printk(KERN_WARNING "pci_dma_dev_setup_pSeriesLP: "
"no DMA window found for pci dev=%s dn=%pOF\n",
Expand All @@ -1551,8 +1593,20 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
if (!pci->table_group) {
pci->table_group = iommu_pseries_alloc_group(pci->phb->node);
tbl = pci->table_group->tables[0];
iommu_table_setparms_lpar(pci->phb, pdn, tbl,
pci->table_group, dma_window);

iommu_table_setparms_common(tbl, pci->phb->bus->number,
be32_to_cpu(prop.liobn),
be64_to_cpu(prop.dma_base),
1ULL << be32_to_cpu(prop.window_shift),
be32_to_cpu(prop.tce_shift), NULL,
&iommu_table_lpar_multi_ops);

/* Only for normal boot with default window. Doesn't matter even
* if we set these with DDW which is 64bit during kdump, since
* these will not be used during kdump.
*/
pci->table_group->tce32_start = be64_to_cpu(prop.dma_base);
pci->table_group->tce32_size = 1 << be32_to_cpu(prop.window_shift);

iommu_init_table(tbl, pci->phb->node, 0, 0);
iommu_register_group(pci->table_group,
Expand Down

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