[PATCH v7 21/50] powerpc/powernv: Increase PE# capacity

Gavin Shan
2015-11-04T13:13:32Z

Each PHB maintains an array helping to translate 2-bytes Request
ID (RID) to PE# with the assumption that PE# takes one byte, meaning
that we can't have more than 256 PEs. However, pci_dn->pe_number
already had 4-bytes for the PE#.

This extends the PE# capacity so that each of them will be 4-bytes
long. Then we can reuse IODA_INVALID_PE to check the PE# stored in
phb->pe_rmap[] is valid or not.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 6 +++++-
arch/powerpc/platforms/powernv/pci.h | 7 ++-----
2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 0e66c4d..ef93a01 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -766,7 +766,7 @@ static int pnv_ioda_deconfigure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)

/* Clear the reverse map */
for (rid = pe->rid; rid < rid_end; rid++)
- phb->ioda.pe_rmap[rid] = 0;
+ phb->ioda.pe_rmap[rid] = IODA_INVALID_PE;

/* Release from all parents PELT-V */
while (parent) {
@@ -3164,6 +3164,10 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
if (prop32)
phb->ioda.reserved_pe_idx = be32_to_cpup(prop32);

+ /* Invalidate RID to PE# mapping */
+ for (i = 0; i < ARRAY_SIZE(phb->ioda.pe_rmap); ++i)
+ phb->ioda.pe_rmap[i] = IODA_INVALID_PE;
+
/* Parse 64-bit MMIO range */
pnv_ioda_parse_m64_window(phb);

diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 0802fcd..5df945f 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -162,11 +162,8 @@ struct pnv_phb {
struct list_head pe_list;
struct mutex pe_list_mutex;

- /* Reverse map of PEs, will have to extend if
- * we are to support more than 256 PEs, indexed
- * bus { bus, devfn }
- */
- unsigned char pe_rmap[0x10000];
+ /* Reverse map of PEs, indexed by {bus, devfn} */
+ int pe_rmap[0x10000];

/* TCE cache invalidate registers (physical and
* remapped)
--
2.1.0