[PATCH v6 12/42] powerpc/powernv: Increase PE# capacity

Gavin Shan
2015-08-06T04:11:17Z

Each PHB maintains an array helping to translate RID (Request
ID) to PE# with the assumption that PE# takes 8 bits, indicating
that we can't have more than 256 PEs. However, pci_dn->pe_number
already had 4-bytes for the PE#.

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

Signed-off-by: Gavin Shan <gwshan-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 8 ++++++--
arch/powerpc/platforms/powernv/pci.h | 7 +++----
2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 57ba8fd..3094c61 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -786,7 +786,7 @@ 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) {
@@ -3134,7 +3134,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
unsigned long size, pemap_off;
const __be64 *prop64;
const __be32 *prop32;
- int len;
+ int len, i;
u64 phb_id;
void *aux;
long rc;
@@ -3201,6 +3201,10 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
if (prop32)
phb->ioda.reserved_pe = 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 1dc9578..6f8568e 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -175,11 +175,10 @@ 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 }
+ /* Reverse map of PEs, indexed by
+ * { bus, devfn }
*/
- unsigned char pe_rmap[0x10000];
+ int pe_rmap[0x10000];

/* 32-bit TCE tables allocation */
unsigned long dma32_segcount;
--
2.1.0

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