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Diffstat (limited to 'arch/powerpc/platforms/powernv/npu-dma.c')
-rw-r--r--arch/powerpc/platforms/powernv/npu-dma.c283
1 files changed, 148 insertions, 135 deletions
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index 7229acd9b..0459e100b 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -12,6 +12,7 @@
#include <linux/export.h>
#include <linux/pci.h>
#include <linux/memblock.h>
+#include <linux/iommu.h>
#include <asm/iommu.h>
#include <asm/pnv-pci.h>
@@ -25,8 +26,6 @@
* Other types of TCE cache invalidation are not functional in the
* hardware.
*/
-#define TCE_KILL_INVAL_ALL PPC_BIT(0)
-
static struct pci_dev *get_pci_dev(struct device_node *dn)
{
return PCI_DN(dn)->pcidev;
@@ -138,22 +137,17 @@ static struct pnv_ioda_pe *get_gpu_pci_dev_and_pe(struct pnv_ioda_pe *npe,
struct pnv_ioda_pe *pe;
struct pci_dn *pdn;
- if (npe->flags & PNV_IODA_PE_PEER) {
- pe = npe->peers[0];
- pdev = pe->pdev;
- } else {
- pdev = pnv_pci_get_gpu_dev(npe->pdev);
- if (!pdev)
- return NULL;
+ pdev = pnv_pci_get_gpu_dev(npe->pdev);
+ if (!pdev)
+ return NULL;
- pdn = pci_get_pdn(pdev);
- if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
- return NULL;
+ pdn = pci_get_pdn(pdev);
+ if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
+ return NULL;
- hose = pci_bus_to_host(pdev->bus);
- phb = hose->private_data;
- pe = &phb->ioda.pe_array[pdn->pe_number];
- }
+ hose = pci_bus_to_host(pdev->bus);
+ phb = hose->private_data;
+ pe = &phb->ioda.pe_array[pdn->pe_number];
if (gpdev)
*gpdev = pdev;
@@ -161,92 +155,70 @@ static struct pnv_ioda_pe *get_gpu_pci_dev_and_pe(struct pnv_ioda_pe *npe,
return pe;
}
-void pnv_npu_tce_invalidate_entire(struct pnv_ioda_pe *npe)
+long pnv_npu_set_window(struct pnv_ioda_pe *npe, int num,
+ struct iommu_table *tbl)
{
struct pnv_phb *phb = npe->phb;
+ int64_t rc;
+ const unsigned long size = tbl->it_indirect_levels ?
+ tbl->it_level_size : tbl->it_size;
+ const __u64 start_addr = tbl->it_offset << tbl->it_page_shift;
+ const __u64 win_size = tbl->it_size << tbl->it_page_shift;
+
+ pe_info(npe, "Setting up window %llx..%llx pg=%lx\n",
+ start_addr, start_addr + win_size - 1,
+ IOMMU_PAGE_SIZE(tbl));
+
+ rc = opal_pci_map_pe_dma_window(phb->opal_id,
+ npe->pe_number,
+ npe->pe_number,
+ tbl->it_indirect_levels + 1,
+ __pa(tbl->it_base),
+ size << 3,
+ IOMMU_PAGE_SIZE(tbl));
+ if (rc) {
+ pe_err(npe, "Failed to configure TCE table, err %lld\n", rc);
+ return rc;
+ }
+ pnv_pci_ioda2_tce_invalidate_entire(phb, false);
- if (WARN_ON(phb->type != PNV_PHB_NPU ||
- !phb->ioda.tce_inval_reg ||
- !(npe->flags & PNV_IODA_PE_DEV)))
- return;
+ /* Add the table to the list so its TCE cache will get invalidated */
+ pnv_pci_link_table_and_group(phb->hose->node, num,
+ tbl, &npe->table_group);
- mb(); /* Ensure previous TCE table stores are visible */
- __raw_writeq(cpu_to_be64(TCE_KILL_INVAL_ALL),
- phb->ioda.tce_inval_reg);
+ return 0;
}
-void pnv_npu_tce_invalidate(struct pnv_ioda_pe *npe,
- struct iommu_table *tbl,
- unsigned long index,
- unsigned long npages,
- bool rm)
+long pnv_npu_unset_window(struct pnv_ioda_pe *npe, int num)
{
struct pnv_phb *phb = npe->phb;
+ int64_t rc;
- /* We can only invalidate the whole cache on NPU */
- unsigned long val = TCE_KILL_INVAL_ALL;
-
- if (WARN_ON(phb->type != PNV_PHB_NPU ||
- !phb->ioda.tce_inval_reg ||
- !(npe->flags & PNV_IODA_PE_DEV)))
- return;
-
- mb(); /* Ensure previous TCE table stores are visible */
- if (rm)
- __raw_rm_writeq(cpu_to_be64(val),
- (__be64 __iomem *) phb->ioda.tce_inval_reg_phys);
- else
- __raw_writeq(cpu_to_be64(val),
- phb->ioda.tce_inval_reg);
-}
-
-void pnv_npu_init_dma_pe(struct pnv_ioda_pe *npe)
-{
- struct pnv_ioda_pe *gpe;
- struct pci_dev *gpdev;
- int i, avail = -1;
-
- if (!npe->pdev || !(npe->flags & PNV_IODA_PE_DEV))
- return;
-
- gpe = get_gpu_pci_dev_and_pe(npe, &gpdev);
- if (!gpe)
- return;
-
- for (i = 0; i < PNV_IODA_MAX_PEER_PES; i++) {
- /* Nothing to do if the PE is already connected. */
- if (gpe->peers[i] == npe)
- return;
+ pe_info(npe, "Removing DMA window\n");
- if (!gpe->peers[i])
- avail = i;
+ rc = opal_pci_map_pe_dma_window(phb->opal_id, npe->pe_number,
+ npe->pe_number,
+ 0/* levels */, 0/* table address */,
+ 0/* table size */, 0/* page size */);
+ if (rc) {
+ pe_err(npe, "Unmapping failed, ret = %lld\n", rc);
+ return rc;
}
+ pnv_pci_ioda2_tce_invalidate_entire(phb, false);
- if (WARN_ON(avail < 0))
- return;
-
- gpe->peers[avail] = npe;
- gpe->flags |= PNV_IODA_PE_PEER;
+ pnv_pci_unlink_table_and_group(npe->table_group.tables[num],
+ &npe->table_group);
- /*
- * We assume that the NPU devices only have a single peer PE
- * (the GPU PCIe device PE).
- */
- npe->peers[0] = gpe;
- npe->flags |= PNV_IODA_PE_PEER;
+ return 0;
}
/*
- * For the NPU we want to point the TCE table at the same table as the
- * real PCI device.
+ * Enables 32 bit DMA on NPU.
*/
-static void pnv_npu_disable_bypass(struct pnv_ioda_pe *npe)
+static void pnv_npu_dma_set_32(struct pnv_ioda_pe *npe)
{
- struct pnv_phb *phb = npe->phb;
struct pci_dev *gpdev;
struct pnv_ioda_pe *gpe;
- void *addr;
- unsigned int size;
int64_t rc;
/*
@@ -260,14 +232,7 @@ static void pnv_npu_disable_bypass(struct pnv_ioda_pe *npe)
if (!gpe)
return;
- addr = (void *)gpe->table_group.tables[0]->it_base;
- size = gpe->table_group.tables[0]->it_size << 3;
- rc = opal_pci_map_pe_dma_window(phb->opal_id, npe->pe_number,
- npe->pe_number, 1, __pa(addr),
- size, 0x1000);
- if (rc != OPAL_SUCCESS)
- pr_warn("%s: Error %lld setting DMA window on PHB#%d-PE#%d\n",
- __func__, rc, phb->hose->global_number, npe->pe_number);
+ rc = pnv_npu_set_window(npe, 0, gpe->table_group.tables[0]);
/*
* We don't initialise npu_pe->tce32_table as we always use
@@ -277,72 +242,120 @@ static void pnv_npu_disable_bypass(struct pnv_ioda_pe *npe)
}
/*
- * Enable/disable bypass mode on the NPU. The NPU only supports one
+ * Enables bypass mode on the NPU. The NPU only supports one
* window per link, so bypass needs to be explicitly enabled or
* disabled. Unlike for a PHB3 bypass and non-bypass modes can't be
* active at the same time.
*/
-int pnv_npu_dma_set_bypass(struct pnv_ioda_pe *npe, bool enable)
+static int pnv_npu_dma_set_bypass(struct pnv_ioda_pe *npe)
{
struct pnv_phb *phb = npe->phb;
int64_t rc = 0;
+ phys_addr_t top = memblock_end_of_DRAM();
if (phb->type != PNV_PHB_NPU || !npe->pdev)
return -EINVAL;
- if (enable) {
- /* Enable the bypass window */
- phys_addr_t top = memblock_end_of_DRAM();
-
- npe->tce_bypass_base = 0;
- top = roundup_pow_of_two(top);
- dev_info(&npe->pdev->dev, "Enabling bypass for PE %d\n",
- npe->pe_number);
- rc = opal_pci_map_pe_dma_window_real(phb->opal_id,
- npe->pe_number, npe->pe_number,
- npe->tce_bypass_base, top);
- } else {
- /*
- * Disable the bypass window by replacing it with the
- * TCE32 window.
- */
- pnv_npu_disable_bypass(npe);
- }
+ rc = pnv_npu_unset_window(npe, 0);
+ if (rc != OPAL_SUCCESS)
+ return rc;
+
+ /* Enable the bypass window */
+
+ top = roundup_pow_of_two(top);
+ dev_info(&npe->pdev->dev, "Enabling bypass for PE %d\n",
+ npe->pe_number);
+ rc = opal_pci_map_pe_dma_window_real(phb->opal_id,
+ npe->pe_number, npe->pe_number,
+ 0 /* bypass base */, top);
+
+ if (rc == OPAL_SUCCESS)
+ pnv_pci_ioda2_tce_invalidate_entire(phb, false);
return rc;
}
-int pnv_npu_dma_set_mask(struct pci_dev *npdev, u64 dma_mask)
+void pnv_npu_try_dma_set_bypass(struct pci_dev *gpdev, bool bypass)
{
- struct pci_controller *hose = pci_bus_to_host(npdev->bus);
- struct pnv_phb *phb = hose->private_data;
- struct pci_dn *pdn = pci_get_pdn(npdev);
- struct pnv_ioda_pe *npe, *gpe;
- struct pci_dev *gpdev;
- uint64_t top;
- bool bypass = false;
+ int i;
+ struct pnv_phb *phb;
+ struct pci_dn *pdn;
+ struct pnv_ioda_pe *npe;
+ struct pci_dev *npdev;
- if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
- return -ENXIO;
+ for (i = 0; ; ++i) {
+ npdev = pnv_pci_get_npu_dev(gpdev, i);
- /* We only do bypass if it's enabled on the linked device */
- npe = &phb->ioda.pe_array[pdn->pe_number];
- gpe = get_gpu_pci_dev_and_pe(npe, &gpdev);
- if (!gpe)
- return -ENODEV;
+ if (!npdev)
+ break;
+
+ pdn = pci_get_pdn(npdev);
+ if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
+ return;
+
+ phb = pci_bus_to_host(npdev->bus)->private_data;
+
+ /* We only do bypass if it's enabled on the linked device */
+ npe = &phb->ioda.pe_array[pdn->pe_number];
+
+ if (bypass) {
+ dev_info(&npdev->dev,
+ "Using 64-bit DMA iommu bypass\n");
+ pnv_npu_dma_set_bypass(npe);
+ } else {
+ dev_info(&npdev->dev, "Using 32-bit DMA via iommu\n");
+ pnv_npu_dma_set_32(npe);
+ }
+ }
+}
- if (gpe->tce_bypass_enabled) {
- top = gpe->tce_bypass_base + memblock_end_of_DRAM() - 1;
- bypass = (dma_mask >= top);
+/* Switch ownership from platform code to external user (e.g. VFIO) */
+void pnv_npu_take_ownership(struct pnv_ioda_pe *npe)
+{
+ struct pnv_phb *phb = npe->phb;
+ int64_t rc;
+
+ /*
+ * Note: NPU has just a single TVE in the hardware which means that
+ * while used by the kernel, it can have either 32bit window or
+ * DMA bypass but never both. So we deconfigure 32bit window only
+ * if it was enabled at the moment of ownership change.
+ */
+ if (npe->table_group.tables[0]) {
+ pnv_npu_unset_window(npe, 0);
+ return;
}
- if (bypass)
- dev_info(&npdev->dev, "Using 64-bit DMA iommu bypass\n");
- else
- dev_info(&npdev->dev, "Using 32-bit DMA via iommu\n");
+ /* Disable bypass */
+ rc = opal_pci_map_pe_dma_window_real(phb->opal_id,
+ npe->pe_number, npe->pe_number,
+ 0 /* bypass base */, 0);
+ if (rc) {
+ pe_err(npe, "Failed to disable bypass, err %lld\n", rc);
+ return;
+ }
+ pnv_pci_ioda2_tce_invalidate_entire(npe->phb, false);
+}
- pnv_npu_dma_set_bypass(npe, bypass);
- *npdev->dev.dma_mask = dma_mask;
+struct pnv_ioda_pe *pnv_pci_npu_setup_iommu(struct pnv_ioda_pe *npe)
+{
+ struct pnv_phb *phb = npe->phb;
+ struct pci_bus *pbus = phb->hose->bus;
+ struct pci_dev *npdev, *gpdev = NULL, *gptmp;
+ struct pnv_ioda_pe *gpe = get_gpu_pci_dev_and_pe(npe, &gpdev);
- return 0;
+ if (!gpe || !gpdev)
+ return NULL;
+
+ list_for_each_entry(npdev, &pbus->devices, bus_list) {
+ gptmp = pnv_pci_get_gpu_dev(npdev);
+
+ if (gptmp != gpdev)
+ continue;
+
+ pe_info(gpe, "Attached NPU %s\n", dev_name(&npdev->dev));
+ iommu_group_add_device(gpe->table_group.group, &npdev->dev);
+ }
+
+ return gpe;
}