On 02/17/2016 02:43 PM, Gavin Shan wrote:
There are two arrays for IO and M32 segment maps on every PHB.
The index of the arrays are segment number and the value stored
in the corresponding element is PE number, indicating the segment
is assigned to the PE. Initially, all elements in those two arrays
are zeroes, meaning all segments are assigned to PE#0. It's wrong.
>
This fixes the initial values in the elements of those two arrays
to IODA_INVALID_PE, meaning all segments aren't assigned to any
PE.
This is ok.
In order to use IODA_INVALID_PE (-1) to represent invalid PE
number, the types of those two arrays are changed from "unsigned int"
to "int".
"unsigned" can carry (-1) perfectly fine, just add a type cast to
IODA_INVALID_PE:
#define IODA_INVALID_PE (unsigned int)(-1)
Using "signed" type for indexes which cannot be negative does not make much
sense - instead of checking for the upper boundary, you have to check for
"< 0" too.
OPAL uses unsigned type for PE (uint64_t or uint32_t or uint16_t - this is
quite funny).
pnv_ioda_pe::pe_number is "unsigned" and this pe_number is the same thing
as I can see in pnv_ioda_setup_dev_PE().
Some printk() print the PE number as "%x" (which implies "unsigned").
I suggest changing the pci_dn::pe_number type from "int" to "unsigned int"
to match pnv_ioda_pe::pe_number, in a separate patch. Or do not touch types
for now.
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/powernv/pci-ioda.c | 9 +++++++--
arch/powerpc/platforms/powernv/pci.h | 4 ++--
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 1d2514f..44cc5f3 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3239,7 +3239,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
unsigned long size, m32map_off, pemap_off, iomap_off = 0;
const __be64 *prop64;
const __be32 *prop32;
- int len;
+ int i, len;
u64 phb_id;
void *aux;
long rc;
@@ -3334,8 +3334,13 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np,
aux = memblock_virt_alloc(size, 0);
phb->ioda.pe_alloc = aux;
phb->ioda.m32_segmap = aux + m32map_off;
- if (phb->type == PNV_PHB_IODA1)
+ for (i = 0; i < phb->ioda.total_pe_num; i++)
+ phb->ioda.m32_segmap[i] = IODA_INVALID_PE;
+ if (phb->type == PNV_PHB_IODA1) {
phb->ioda.io_segmap = aux + iomap_off;
+ for (i = 0; i < phb->ioda.total_pe_num; i++)
+ phb->ioda.io_segmap[i] = IODA_INVALID_PE;
+ }
phb->ioda.pe_array = aux + pemap_off;
set_bit(phb->ioda.reserved_pe_idx, phb->ioda.pe_alloc);
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 784882a..36c4965 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -146,8 +146,8 @@ struct pnv_phb {
struct pnv_ioda_pe *pe_array;
/* M32 & IO segment maps */
- unsigned int *m32_segmap;
- unsigned int *io_segmap;
+ int *m32_segmap;
+ int *io_segmap;
/* IRQ chip */
int irq_chip_init;
--
Alexey
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