[PATCH v6 09/42] powerpc/powernv: DMA32 cleanup

Gavin Shan
2015-08-06T04:11:14Z

The patch cleans up DMA32 in pci-ioda.c. It shouldn't introduce
behavioural changes:

* Rename various fields in "struct pnv_phb" and "struct pnv_ioda_pe"
as 32-bits DMA should be related to "DMA", not "TCE".
* Removed struct pnv_ioda_pe::tce32_segcount.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 48 +++++++++++++++----------------
arch/powerpc/platforms/powernv/pci.h | 7 ++---
2 files changed, 27 insertions(+), 28 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 7342cfd..8456f37 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -917,7 +917,7 @@ static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb,
struct pnv_ioda_pe *lpe;

list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) {
- if (lpe->dma_weight < pe->dma_weight) {
+ if (lpe->dma32_weight < pe->dma32_weight) {
list_add_tail(&pe->dma_link, &lpe->dma_link);
return;
}
@@ -942,14 +942,14 @@ static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
dev->class == PCI_CLASS_SERIAL_USB_EHCI)
- return 3 * phb->ioda.tce32_count;
+ return 3 * phb->ioda.dma32_segcount;

/* Increase the weight of RAID (includes Obsidian) */
if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
- return 15 * phb->ioda.tce32_count;
+ return 15 * phb->ioda.dma32_segcount;

/* Default */
- return 10 * phb->ioda.tce32_count;
+ return 10 * phb->ioda.dma32_segcount;
}

static int __pnv_ioda_phb_dma_weight(struct pci_dev *pdev, void *data)
@@ -1057,7 +1057,7 @@ 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);
+ pe->dma32_weight += pnv_ioda_dma_weight(dev);
if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
pnv_ioda_setup_same_PE(dev->subordinate, pe);
}
@@ -1094,10 +1094,10 @@ 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->dma32_seg = -1;
pe->mve_number = -1;
pe->rid = bus->busn_res.start << 8;
- pe->dma_weight = 0;
+ pe->dma32_weight = 0;

if (all)
pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n",
@@ -1460,7 +1460,7 @@ 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->dma32_seg = -1;
pe->mve_number = -1;
pe->rid = (pci_iov_virtfn_bus(pdev, vf_index) << 8) |
pci_iov_virtfn_devfn(pdev, vf_index);
@@ -1936,7 +1936,7 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
/* 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))
+ if (WARN_ON(pe->dma32_seg >= 0))
return;

tbl = pnv_pci_table_alloc(phb->hose->node);
@@ -1945,7 +1945,7 @@ static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
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->dma32_seg = base;
pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
(base << 28), ((base + segs) << 28) - 1);

@@ -2006,8 +2006,8 @@ static void pnv_pci_ioda_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 (pe->dma32_seg >= 0)
+ pe->dma32_seg = -1;
if (tce_mem)
__free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
if (tbl) {
@@ -2405,7 +2405,7 @@ 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))
+ if (WARN_ON(pe->dma32_seg >= 0))
return;

/* TVE #1 is selected by PCI address bit 59 */
@@ -2415,7 +2415,7 @@ 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->dma32_seg = 0;
pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
phb->ioda.m32_pci_base);

@@ -2432,8 +2432,8 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,

rc = pnv_pci_ioda2_setup_default_config(pe);
if (rc) {
- if (pe->tce32_seg >= 0)
- pe->tce32_seg = -1;
+ if (pe->dma32_seg >= 0)
+ pe->dma32_seg = -1;
return;
}

@@ -2452,7 +2452,7 @@ static void pnv_ioda_setup_dma(struct pnv_phb *phb)
/* Calculate the PHB's DMA weight */
dma_weight = pnv_ioda_phb_dma_weight(phb);
pr_info("PCI%04x has %ld DMA32 segments, total weight %d\n",
- hose->global_number, phb->ioda.tce32_count, dma_weight);
+ hose->global_number, phb->ioda.dma32_segcount, dma_weight);

pnv_pci_ioda_setup_opal_tce_kill(phb);

@@ -2461,7 +2461,7 @@ static void pnv_ioda_setup_dma(struct pnv_phb *phb)
* weight
*/
list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
- if (!pe->dma_weight)
+ if (!pe->dma32_weight)
continue;

/*
@@ -2472,15 +2472,15 @@ static void pnv_ioda_setup_dma(struct pnv_phb *phb)
if (phb->type == PNV_PHB_IODA1) {
unsigned int segs, base = 0;

- if (pe->dma_weight <
- dma_weight / phb->ioda.tce32_count)
+ if (pe->dma32_weight <
+ dma_weight / phb->ioda.dma32_segcount)
segs = 1;
else
- segs = (pe->dma_weight *
- phb->ioda.tce32_count) / dma_weight;
+ segs = (pe->dma32_weight *
+ phb->ioda.dma32_segcount) / dma_weight;

pe_info(pe, "DMA32 weight %d, assigned %d segments\n",
- pe->dma_weight, segs);
+ pe->dma32_weight, segs);
pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);

base += segs;
@@ -3211,7 +3211,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
mutex_init(&phb->ioda.pe_list_mutex);

/* Calculate how many 32-bit TCE segments we have */
- phb->ioda.tce32_count = phb->ioda.m32_pci_base >> 28;
+ phb->ioda.dma32_segcount = phb->ioda.m32_pci_base >> 28;

#if 0 /* We should really do that ... */
rc = opal_pci_set_phb_mem_window(opal->phb_id,
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index addd3f7..574fe43 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -61,11 +61,10 @@ struct pnv_ioda_pe {
/* "Weight" assigned to the PE for the sake of DMA resource
* allocations
*/
- unsigned int dma_weight;
+ unsigned int dma32_weight;

/* "Base" iommu table, ie, 4K TCEs, 32-bit DMA */
- int tce32_seg;
- int tce32_segcount;
+ int dma32_seg;
struct iommu_table_group table_group;

/* 64-bit TCE bypass region */
@@ -181,7 +180,7 @@ struct pnv_phb {
unsigned char pe_rmap[0x10000];

/* 32-bit TCE tables allocation */
- unsigned long tce32_count;
+ unsigned long dma32_segcount;

/* Sorted list of used PE's, sorted at
* boot for resource allocation purposes
--
2.1.0