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Subject[PATCH 01/13] powerpc/powernv: Introduce new PHB type for opencapi links
Date
The NPU was already abstracted by opal as a virtual PHB for nvlink,
but it helps to be able to differentiate between a nvlink or opencapi
PHB, as it's not completely transparent to linux. In particular, PE
assignment differs and we'll also need the information in later
patches.

So rename existing PNV_PHB_NPU type to PNV_PHB_NPU_NVLINK and add a
new type PNV_PHB_NPU_OCAPI.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
---
arch/powerpc/platforms/powernv/npu-dma.c | 2 +-
arch/powerpc/platforms/powernv/pci-ioda.c | 46 +++++++++++++++++++++++--------
arch/powerpc/platforms/powernv/pci.c | 4 +++
arch/powerpc/platforms/powernv/pci.h | 8 ++++--
4 files changed, 45 insertions(+), 15 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index f6cbc1a71472..c5899c107d59 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -277,7 +277,7 @@ static int pnv_npu_dma_set_bypass(struct pnv_ioda_pe *npe)
int64_t rc = 0;
phys_addr_t top = memblock_end_of_DRAM();

- if (phb->type != PNV_PHB_NPU || !npe->pdev)
+ if (phb->type != PNV_PHB_NPU_NVLINK || !npe->pdev)
return -EINVAL;

rc = pnv_npu_unset_window(npe, 0);
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 749055553064..c37b5d288f9c 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -54,7 +54,8 @@
#define POWERNV_IOMMU_DEFAULT_LEVELS 1
#define POWERNV_IOMMU_MAX_LEVELS 5

-static const char * const pnv_phb_names[] = { "IODA1", "IODA2", "NPU" };
+static const char * const pnv_phb_names[] = { "IODA1", "IODA2", "NPU_NVLINK",
+ "NPU_OCAPI" };
static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl);

void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level,
@@ -924,7 +925,7 @@ static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
* Configure PELTV. NPUs don't have a PELTV table so skip
* configuration on them.
*/
- if (phb->type != PNV_PHB_NPU)
+ if (phb->type != PNV_PHB_NPU_NVLINK && phb->type != PNV_PHB_NPU_OCAPI)
pnv_ioda_set_peltv(phb, pe, true);

/* Setup reverse map */
@@ -1260,12 +1261,13 @@ static struct pnv_ioda_pe *pnv_ioda_setup_npu_PE(struct pci_dev *npu_pdev)
return pe;
}

-static void pnv_ioda_setup_npu_PEs(struct pci_bus *bus)
+static void pnv_ioda_setup_npu_PEs(struct pci_bus *bus,
+ struct pnv_ioda_pe *fn(struct pci_dev *npu_pdev))
{
struct pci_dev *pdev;

list_for_each_entry(pdev, &bus->devices, bus_list)
- pnv_ioda_setup_npu_PE(pdev);
+ fn(pdev);
}

static void pnv_pci_ioda_setup_PEs(void)
@@ -1275,13 +1277,18 @@ static void pnv_pci_ioda_setup_PEs(void)

list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
phb = hose->private_data;
- if (phb->type == PNV_PHB_NPU) {
+ if (phb->type == PNV_PHB_NPU_NVLINK) {
/* PE#0 is needed for error reporting */
pnv_ioda_reserve_pe(phb, 0);
- pnv_ioda_setup_npu_PEs(hose->bus);
+ pnv_ioda_setup_npu_PEs(hose->bus,
+ pnv_ioda_setup_npu_PE);
if (phb->model == PNV_PHB_MODEL_NPU2)
pnv_npu2_init(phb);
}
+ if (phb->type == PNV_PHB_NPU_OCAPI) {
+ pnv_ioda_setup_npu_PEs(hose->bus,
+ pnv_ioda_setup_dev_PE);
+ }
}
}

@@ -2640,7 +2647,7 @@ static int gpe_table_group_to_npe_cb(struct device *dev, void *opaque)

hose = pci_bus_to_host(pdev->bus);
phb = hose->private_data;
- if (phb->type != PNV_PHB_NPU)
+ if (phb->type != PNV_PHB_NPU_NVLINK)
return 0;

*ptmppe = &phb->ioda.pe_array[pdn->pe_number];
@@ -2724,7 +2731,7 @@ static void pnv_pci_ioda_setup_iommu_api(void)
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
phb = hose->private_data;

- if (phb->type != PNV_PHB_NPU)
+ if (phb->type != PNV_PHB_NPU_NVLINK)
continue;

list_for_each_entry(pe, &phb->ioda.pe_list, list) {
@@ -3774,6 +3781,13 @@ static const struct pci_controller_ops pnv_npu_ioda_controller_ops = {
.shutdown = pnv_pci_ioda_shutdown,
};

+static const struct pci_controller_ops pnv_npu_ocapi_ioda_controller_ops = {
+ .enable_device_hook = pnv_pci_enable_device_hook,
+ .window_alignment = pnv_pci_window_alignment,
+ .reset_secondary_bus = pnv_pci_reset_secondary_bus,
+ .shutdown = pnv_pci_ioda_shutdown,
+};
+
#ifdef CONFIG_CXL_BASE
const struct pci_controller_ops pnv_cxl_cx4_ioda_controller_ops = {
.dma_dev_setup = pnv_pci_dma_dev_setup,
@@ -4007,9 +4021,14 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
*/
ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;

- if (phb->type == PNV_PHB_NPU) {
+ switch (phb->type) {
+ case PNV_PHB_NPU_NVLINK:
hose->controller_ops = pnv_npu_ioda_controller_ops;
- } else {
+ break;
+ case PNV_PHB_NPU_OCAPI:
+ hose->controller_ops = pnv_npu_ocapi_ioda_controller_ops;
+ break;
+ default:
phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
hose->controller_ops = pnv_pci_ioda_controller_ops;
}
@@ -4052,7 +4071,12 @@ void __init pnv_pci_init_ioda2_phb(struct device_node *np)

void __init pnv_pci_init_npu_phb(struct device_node *np)
{
- pnv_pci_init_ioda_phb(np, 0, PNV_PHB_NPU);
+ pnv_pci_init_ioda_phb(np, 0, PNV_PHB_NPU_NVLINK);
+}
+
+void __init pnv_pci_init_npu2_opencapi_phb(struct device_node *np)
+{
+ pnv_pci_init_ioda_phb(np, 0, PNV_PHB_NPU_OCAPI);
}

void __init pnv_pci_init_ioda_hub(struct device_node *np)
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 5422f4a6317c..69d102cbf48f 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -1142,6 +1142,10 @@ void __init pnv_pci_init(void)
for_each_compatible_node(np, NULL, "ibm,ioda2-npu2-phb")
pnv_pci_init_npu_phb(np);

+ /* Look for NPU2 OpenCAPI PHBs */
+ for_each_compatible_node(np, NULL, "ibm,ioda2-npu2-opencapi-phb")
+ pnv_pci_init_npu2_opencapi_phb(np);
+
/* Configure IOMMU DMA hooks */
set_pci_dma_ops(&dma_iommu_ops);
}
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index b772d7473896..eada4b6068cb 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -12,9 +12,10 @@ struct pci_dn;
#define NV_NMMU_ATSD_REGS 8

enum pnv_phb_type {
- PNV_PHB_IODA1 = 0,
- PNV_PHB_IODA2 = 1,
- PNV_PHB_NPU = 2,
+ PNV_PHB_IODA1 = 0,
+ PNV_PHB_IODA2 = 1,
+ PNV_PHB_NPU_NVLINK = 2,
+ PNV_PHB_NPU_OCAPI = 3,
};

/* Precise PHB model for error management */
@@ -227,6 +228,7 @@ extern void pnv_pci_setup_iommu_table(struct iommu_table *tbl,
extern void pnv_pci_init_ioda_hub(struct device_node *np);
extern void pnv_pci_init_ioda2_phb(struct device_node *np);
extern void pnv_pci_init_npu_phb(struct device_node *np);
+extern void pnv_pci_init_npu2_opencapi_phb(struct device_node *np);
extern void pnv_pci_reset_secondary_bus(struct pci_dev *dev);
extern int pnv_eeh_phb_reset(struct pci_controller *hose, int option);

--
2.14.1
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