On Tue, Nov 17, 2015 at 12:54:04PM +1100, Alexey Kardashevskiy wrote: >On 11/05/2015 12:12 AM, Gavin Shan wrote: >>PEs are put into PHB DMA32 list (phb->ioda.pe_dma_list) according >>to their DMA32 weight. The PEs on the list are iterated to setup >>their TCE32 tables at system booting time. The list is used for >>once and there is no good reason for it to survive. > >From the above I concluded that you need a list, just do not need to keep >after the configuration is done but in fact you remove the list completely so >just remove "to survive" (s/for it to survive/for keep having it/) :) > Thanks & will change it accordingly in next revision :) >> >>This moves the logic calculating DMA32 weight of PHB and PE to >>pnv_pci_ioda1_setup_dma() to drop PHB's DMA32 list. >> >>Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx> >>--- >> arch/powerpc/platforms/powernv/pci-ioda.c | 150 ++++++++++++++---------------- >> arch/powerpc/platforms/powernv/pci.h | 19 ---- >> 2 files changed, 68 insertions(+), 101 deletions(-) >> >>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c >>index 4c2e023..20ebe6e 100644 >>--- a/arch/powerpc/platforms/powernv/pci-ioda.c >>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c >>@@ -891,44 +891,6 @@ out: >> return 0; >> } >> >>-static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb, >>- struct pnv_ioda_pe *pe) >>-{ >>- struct pnv_ioda_pe *lpe; >>- >>- list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) { >>- if (lpe->dma_weight < pe->dma_weight) { >>- list_add_tail(&pe->dma_link, &lpe->dma_link); >>- return; >>- } >>- } >>- list_add_tail(&pe->dma_link, &phb->ioda.pe_dma_list); >>-} >>- >>-static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev) >>-{ >>- /* This is quite simplistic. The "base" weight of a device >>- * is 10. 0 means no DMA is to be accounted for it. >>- */ >>- >>- /* If it's a bridge, no DMA */ >>- if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) >>- return 0; >>- >>- /* Reduce the weight of slow USB controllers */ >>- if (dev->class == PCI_CLASS_SERIAL_USB_UHCI || >>- dev->class == PCI_CLASS_SERIAL_USB_OHCI || >>- dev->class == PCI_CLASS_SERIAL_USB_EHCI) >>- return 3; >>- >>- /* Increase the weight of RAID (includes Obsidian) */ >>- if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID) >>- return 15; >>- >>- /* Default */ >>- return 10; >>-} >>- >> #ifdef CONFIG_PCI_IOV >> static int pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset) >> { >>@@ -1009,7 +971,6 @@ static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe) >> continue; >> } >> pdn->pe_number = pe->pe_number; >>- pe->dma_weight += pnv_ioda_dma_weight(dev); >> if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate) >> pnv_ioda_setup_same_PE(dev->subordinate, pe); >> } >>@@ -1046,10 +1007,8 @@ static void pnv_ioda_setup_bus_PE(struct pci_bus *bus, bool all) >> pe->flags |= (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS); >> pe->pbus = bus; >> pe->pdev = NULL; >>- pe->tce32_seg = -1; >> pe->mve_number = -1; >> pe->rid = bus->busn_res.start << 8; >>- pe->dma_weight = 0; >> >> if (all) >> pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n", >>@@ -1071,17 +1030,6 @@ static void pnv_ioda_setup_bus_PE(struct pci_bus *bus, bool all) >> >> /* Put PE to the list */ >> list_add_tail(&pe->list, &phb->ioda.pe_list); >>- >>- /* Account for one DMA PE if at least one DMA capable device exist >>- * below the bridge >>- */ >>- if (pe->dma_weight != 0) { >>- phb->ioda.dma_weight += pe->dma_weight; >>- phb->ioda.dma_pe_count++; >>- } >>- >>- /* Link the PE */ >>- pnv_ioda_link_pe_by_weight(phb, pe); >> } >> >> static void pnv_ioda_setup_PEs(struct pci_bus *bus) >>@@ -1389,7 +1337,6 @@ static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs) >> pe->flags = PNV_IODA_PE_VF; >> pe->pbus = NULL; >> pe->parent_dev = pdev; >>- pe->tce32_seg = -1; >> pe->mve_number = -1; >> pe->rid = (pci_iov_virtfn_bus(pdev, vf_index) << 8) | >> pci_iov_virtfn_devfn(pdev, vf_index); >>@@ -1842,6 +1789,47 @@ static struct iommu_table_ops pnv_ioda2_iommu_ops = { >> .free = pnv_ioda2_table_free, >> }; >> >>+static int pnv_pci_ioda_dev_dma_weight(struct pci_dev *dev, void *data) >>+{ >>+ unsigned int *weight = (unsigned int *)data; >>+ >>+ /* This is quite simplistic. The "base" weight of a device >>+ * is 10. 0 means no DMA is to be accounted for it. >>+ */ >>+ >>+ if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) >>+ return 0; >>+ >>+ if (dev->class == PCI_CLASS_SERIAL_USB_UHCI || >>+ dev->class == PCI_CLASS_SERIAL_USB_OHCI || >>+ dev->class == PCI_CLASS_SERIAL_USB_EHCI) >>+ *weight += 3; >>+ else if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID) >>+ *weight += 15; >>+ else >>+ *weight += 10; >>+ >>+ return 0; >>+} >>+ >>+static unsigned int pnv_pci_ioda_pe_dma_weight(struct pnv_ioda_pe *pe) >>+{ >>+ unsigned int weight = 0; >>+ >>+ if ((pe->flags & PNV_IODA_PE_DEV) && pe->pdev) { >>+ pnv_pci_ioda_dev_dma_weight(pe->pdev, &weight); >>+ } else if ((pe->flags & PNV_IODA_PE_BUS) && pe->pbus) { >>+ struct pci_dev *pdev; >>+ >>+ list_for_each_entry(pdev, &pe->pbus->devices, bus_list) >>+ pnv_pci_ioda_dev_dma_weight(pdev, &weight); >>+ } else if ((pe->flags & PNV_IODA_PE_BUS_ALL) && pe->pbus) { >>+ pci_walk_bus(pe->pbus, pnv_pci_ioda_dev_dma_weight, &weight); >>+ } >>+ >>+ return weight; >>+} >>+ >> static void pnv_pci_ioda1_setup_dma_pe(struct pnv_phb *phb, >> struct pnv_ioda_pe *pe, >> unsigned int base, >>@@ -1858,17 +1846,12 @@ static void pnv_pci_ioda1_setup_dma_pe(struct pnv_phb *phb, >> /* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */ >> /* XXX FIXME: Allocate multi-level tables on PHB3 */ >> >>- /* We shouldn't already have a 32-bit DMA associated */ >>- if (WARN_ON(pe->tce32_seg >= 0)) >>- return; >>- >> tbl = pnv_pci_table_alloc(phb->hose->node); >> iommu_register_group(&pe->table_group, phb->hose->global_number, >> pe->pe_number); >> pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group); >> >> /* Grab a 32-bit TCE table */ >>- pe->tce32_seg = base; >> pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n", >> base * PNV_IODA1_DMA32_SEGSIZE, >> (base + segs) * PNV_IODA1_DMA32_SEGSIZE - 1); >>@@ -1932,8 +1915,6 @@ static void pnv_pci_ioda1_setup_dma_pe(struct pnv_phb *phb, >> return; >> fail: >> /* XXX Failure: Try to fallback to 64-bit only ? */ >>- if (pe->tce32_seg >= 0) >>- pe->tce32_seg = -1; >> if (tce_mem) >> __free_pages(tce_mem, get_order(tce32_segsz * segs)); >> if (tbl) { >>@@ -2344,10 +2325,6 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, >> { >> int64_t rc; >> >>- /* We shouldn't already have a 32-bit DMA associated */ >>- if (WARN_ON(pe->tce32_seg >= 0)) >>- return; >>- >> /* TVE #1 is selected by PCI address bit 59 */ >> pe->tce_bypass_base = 1ull << 59; >> >>@@ -2355,7 +2332,6 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, >> pe->pe_number); >> >> /* The PE will reserve all possible 32-bits space */ >>- pe->tce32_seg = 0; >> pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n", >> phb->ioda.m32_pci_base); >> >>@@ -2371,11 +2347,8 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, >> #endif >> >> rc = pnv_pci_ioda2_setup_default_config(pe); >>- if (rc) { >>- if (pe->tce32_seg >= 0) >>- pe->tce32_seg = -1; >>+ if (rc) >> return; >>- } >> >> if (pe->flags & PNV_IODA_PE_DEV) >> iommu_add_device(&pe->pdev->dev); >>@@ -2386,24 +2359,34 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, >> static void pnv_pci_ioda1_setup_dma(struct pnv_phb *phb) >> { >> struct pci_controller *hose = phb->hose; >>- unsigned int residual, remaining, segs, tw, base; >>+ unsigned int weight, total_weight, dma_pe_count; >>+ unsigned int residual, remaining, segs, base; >> struct pnv_ioda_pe *pe; >> >>+ total_weight = 0; >>+ dma_pe_count = 0; >>+ list_for_each_entry(pe, &phb->ioda.pe_list, list) { >>+ weight = pnv_pci_ioda_pe_dma_weight(pe); >>+ if (weight > 0) >>+ dma_pe_count++; >>+ >>+ total_weight += weight; >>+ } >>+ >> /* If we have more PE# than segments available, hand out one >> * per PE until we run out and let the rest fail. If not, >> * then we assign at least one segment per PE, plus more based >> * on the amount of devices under that PE >> */ >>- if (phb->ioda.dma_pe_count > phb->ioda.tce32_count) >>+ if (dma_pe_count > phb->ioda.tce32_count) >> residual = 0; >> else >>- residual = phb->ioda.tce32_count - >>- phb->ioda.dma_pe_count; >>+ residual = phb->ioda.tce32_count - dma_pe_count; >> >> pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n", >> hose->global_number, phb->ioda.tce32_count); >> pr_info("PCI: %d PE# for a total weight of %d\n", >>- phb->ioda.dma_pe_count, phb->ioda.dma_weight); >>+ dma_pe_count, total_weight); >> >> pnv_pci_ioda_setup_opal_tce_kill(phb); >> >>@@ -2412,24 +2395,26 @@ static void pnv_pci_ioda1_setup_dma(struct pnv_phb *phb) >> * weight >> */ >> remaining = phb->ioda.tce32_count; >>- tw = phb->ioda.dma_weight; >> base = 0; >>- list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) { >>- if (!pe->dma_weight) >>+ list_for_each_entry(pe, &phb->ioda.pe_list, list) { >>+ weight = pnv_pci_ioda_pe_dma_weight(pe); >>+ if (!weight) >> continue; >>+ > > >Unrelated new line. > Will remove it in next revision. Thanks, Gavin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html