[PATCH 1/5] powerpc/powernv: Free PHB instance upon error

[PATCH 1/5] powerpc/powernv: Free PHB instance upon error

[Gavin Shan]

We don't free PHB instance (struct pnv_phb) on error to creating
the associated PCI controler (struct pci_controller). The patch
fixes that. Also, the output messages have been cleaned for a bit
so that they looks unified for IODA_1/2 cases.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index d8140b1..9cccdc7 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1113,7 +1113,7 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 	void *aux;
 	long rc;
 
-	pr_info(" Initializing IODA%d OPAL PHB %s\n", ioda_type, np->full_name);
+	pr_info("Initializing IODA%d OPAL PHB %s\n", ioda_type, np->full_name);
 
 	prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
 	if (!prop64) {
@@ -1124,13 +1124,18 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 	pr_debug("  PHB-ID  : 0x%016llx\n", phb_id);
 
 	phb = alloc_bootmem(sizeof(struct pnv_phb));
-	if (phb) {
-		memset(phb, 0, sizeof(struct pnv_phb));
-		phb->hose = hose = pcibios_alloc_controller(np);
+	if (!phb) {
+		pr_err("  Out of memory !\n");
+		return;
 	}
-	if (!phb || !phb->hose) {
-		pr_err("PCI: Failed to allocate PCI controller for %s\n",
+
+	/* Allocate PCI controller */
+	memset(phb, 0, sizeof(struct pnv_phb));
+	phb->hose = hose = pcibios_alloc_controller(np);
+	if (!phb->hose) {
+		pr_err("  Can't allocate PCI controller for %s\n",
 		       np->full_name);
+		free_bootmem((unsigned long)phb, sizeof(struct pnv_phb));
 		return;
 	}
 
-- 
1.7.5.4

[PATCH 2/5] powerpc/powernv: Fetch PHB bus range from dev-tree

[Gavin Shan]

The patch enables fetching bus range from device-tree for the
specific PHB. If we can't get that from device-tree, the default
range [0 255] will be used.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 9cccdc7..f472228 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1109,6 +1109,7 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 	unsigned long size, m32map_off, iomap_off, pemap_off;
 	const u64 *prop64;
 	const u32 *prop32;
+	int len;
 	u64 phb_id;
 	void *aux;
 	long rc;
@@ -1140,9 +1141,15 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 	}
 
 	spin_lock_init(&phb->lock);
-	/* XXX Use device-tree */
-	hose->first_busno = 0;
-	hose->last_busno = 0xff;
+	prop32 = of_get_property(np, "bus-range", &len);
+	if (prop32 && len == 8) {
+		hose->first_busno = prop32[0];
+		hose->last_busno = prop32[1];
+	} else {
+		pr_warn("  Broken <bus-range> on %s\n", np->full_name);
+		hose->first_busno = 0;
+		hose->last_busno = 0xff;
+	}
 	hose->private_data = phb;
 	phb->hub_id = hub_id;
 	phb->opal_id = phb_id;
-- 
1.7.5.4

[PATCH 3/5] powerpc/powernv: Check primary PHB through ID

[Gavin Shan]

The index of one specific PCI controller (struct pci_controller::
global_number) can tell that it's primary one or not. So we needn't
additional variable for that and just remove it.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index f472228..829047b 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1104,7 +1104,6 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 				  u64 hub_id, int ioda_type)
 {
 	struct pci_controller *hose;
-	static int primary = 1;
 	struct pnv_phb *phb;
 	unsigned long size, m32map_off, iomap_off, pemap_off;
 	const u64 *prop64;
@@ -1164,8 +1163,7 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 		phb->model = PNV_PHB_MODEL_UNKNOWN;
 
 	/* Parse 32-bit and IO ranges (if any) */
-	pci_process_bridge_OF_ranges(phb->hose, np, primary);
-	primary = 0;
+	pci_process_bridge_OF_ranges(hose, np, !hose->global_number);
 
 	/* Get registers */
 	phb->regs = of_iomap(np, 0);
-- 
1.7.5.4

[PATCH 4/5] powerpc/powernv: Pick up correct number of PEs

[Gavin Shan]

Usually, the property "ibm,opal-num-pes" of PHB dev-tree node
indicates the number of total PEs. If that property isn't existing
or valid, we should fall back to pick the correct number of total
PEs according to PHB type: IODA1 or IODA2.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 829047b..6386bb4 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1172,11 +1172,14 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 
 	/* Initialize more IODA stuff */
 	prop32 = of_get_property(np, "ibm,opal-num-pes", NULL);
-	if (!prop32)
-		phb->ioda.total_pe = 1;
-	else
+	if (prop32)
 		phb->ioda.total_pe = *prop32;
-
+	else if (phb->type == PNV_PHB_IODA1)
+		phb->ioda.total_pe = 128;
+	else if (phb->type == PNV_PHB_IODA2)
+		phb->ioda.total_pe = 256;
+	else
+		phb->ioda.total_pe = 1;
 	phb->ioda.m32_size = resource_size(&hose->mem_resources[0]);
 	/* FW Has already off top 64k of M32 space (MSI space) */
 	phb->ioda.m32_size += 0x10000;
-- 
1.7.5.4

[PATCH 5/5] powerpc/powernv: Needn't IO segment map for PHB3

[Gavin Shan]

PHB3 doesn't support IO ports and we needn't IO segment map for that.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c |   13 +++++++------
 1 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 6386bb4..147f9b7 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1190,22 +1190,23 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
 	phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe;
 	phb->ioda.io_pci_base = 0; /* XXX calculate this ? */
 
-	/* Allocate aux data & arrays
-	 *
-	 * XXX TODO: Don't allocate io segmap on PHB3
-	 */
+	/* Allocate aux data & arrays. We don't have IO ports on PHB3 */
 	size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
 	m32map_off = size;
 	size += phb->ioda.total_pe * sizeof(phb->ioda.m32_segmap[0]);
 	iomap_off = size;
-	size += phb->ioda.total_pe * sizeof(phb->ioda.io_segmap[0]);
+	if (phb->type == PNV_PHB_IODA1) {
+		iomap_off = size;
+		size += phb->ioda.total_pe * sizeof(phb->ioda.io_segmap[0]);
+	}
 	pemap_off = size;
 	size += phb->ioda.total_pe * sizeof(struct pnv_ioda_pe);
 	aux = alloc_bootmem(size);
 	memset(aux, 0, size);
 	phb->ioda.pe_alloc = aux;
 	phb->ioda.m32_segmap = aux + m32map_off;
-	phb->ioda.io_segmap = aux + iomap_off;
+	if (phb->type == PNV_PHB_IODA1)
+		phb->ioda.io_segmap = aux + iomap_off;
 	phb->ioda.pe_array = aux + pemap_off;
 	set_bit(0, phb->ioda.pe_alloc);
 
-- 
1.7.5.4

Re: [PATCH 4/5] powerpc/powernv: Pick up correct number of PEs

[Benjamin Herrenschmidt]

On Wed, 2013-07-31 at 16:47 +0800, Gavin Shan wrote:
> Usually, the property "ibm,opal-num-pes" of PHB dev-tree node
> indicates the number of total PEs. If that property isn't existing
> or valid, we should fall back to pick the correct number of total
> PEs according to PHB type: IODA1 or IODA2.

Is that correct ? Don't we get the total number of PEs from a config
register on the bridge ? I didn't think the IODA architecture specified
the total number of PE of a given implementation...

For example, does Torrent implement 128 ?

I'd rather stick to safe here, if the firmware doesn't say, just use
one.

Now some of the PHB registers are actually architected in IODA afaik, so
we could just go look but let's not make a precedent here.

Cheers,
Ben.

> Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
> ---
>  arch/powerpc/platforms/powernv/pci-ioda.c |   11 +++++++----
>  1 files changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index 829047b..6386bb4 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -1172,11 +1172,14 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
>  
>  	/* Initialize more IODA stuff */
>  	prop32 = of_get_property(np, "ibm,opal-num-pes", NULL);
> -	if (!prop32)
> -		phb->ioda.total_pe = 1;
> -	else
> +	if (prop32)
>  		phb->ioda.total_pe = *prop32;
> -
> +	else if (phb->type == PNV_PHB_IODA1)
> +		phb->ioda.total_pe = 128;
> +	else if (phb->type == PNV_PHB_IODA2)
> +		phb->ioda.total_pe = 256;
> +	else
> +		phb->ioda.total_pe = 1;
>  	phb->ioda.m32_size = resource_size(&hose->mem_resources[0]);
>  	/* FW Has already off top 64k of M32 space (MSI space) */
>  	phb->ioda.m32_size += 0x10000;

Re: [PATCH 4/5] powerpc/powernv: Pick up correct number of PEs

[Gavin Shan]

On Wed, Jul 31, 2013 at 07:18:46PM +1000, Benjamin Herrenschmidt wrote:
>On Wed, 2013-07-31 at 16:47 +0800, Gavin Shan wrote:
>> Usually, the property "ibm,opal-num-pes" of PHB dev-tree node
>> indicates the number of total PEs. If that property isn't existing
>> or valid, we should fall back to pick the correct number of total
>> PEs according to PHB type: IODA1 or IODA2.
>
>Is that correct ? Don't we get the total number of PEs from a config
>register on the bridge ? I didn't think the IODA architecture specified
>the total number of PE of a given implementation...
>

For now, the firmware has fixed values (1/128/256), which isn't figured
out from EEH capability register. That might be something to do later
for the f/w.

>For example, does Torrent implement 128 ?
>

I don't know what's "Torrent" :-)

>I'd rather stick to safe here, if the firmware doesn't say, just use
>one.
>
>Now some of the PHB registers are actually architected in IODA afaik, so
>we could just go look but let's not make a precedent here.
>

Ok. Thanks, Ben. Please drop this one :-)

Thanks,
Gavin

Re: [PATCH 4/5] powerpc/powernv: Pick up correct number of PEs

[Benjamin Herrenschmidt]

On Thu, 2013-08-01 at 12:24 +0800, Gavin Shan wrote:
> at correct ? Don't we get the total number of PEs from a config
> >register on the bridge ? I didn't think the IODA architecture specified
> >the total number of PE of a given implementation...
> >
> 
> For now, the firmware has fixed values (1/128/256), which isn't figured
> out from EEH capability register. That might be something to do later
> for the f/w.

Sure but we can fix the firmware easily, we need per-chip code in there
anyway, while in Linux, we mostly avoid exposing the specifics of a
given implementation of the architecture, we only expose the
architectural version (IODA1 vs IODA2).

> >For example, does Torrent implement 128 ?
>
> 
> I don't know what's "Torrent" :-)

It's one of our IO chips for P7 :-) It has a built-in HFI (sort-of
infiniband thingy) and implements PCIe slots with IODA1. It has *some*
differences to P7IOC however.

> >I'd rather stick to safe here, if the firmware doesn't say, just use
> >one.
> >
> >Now some of the PHB registers are actually architected in IODA afaik, so
> >we could just go look but let's not make a precedent here.
> >
> 
> Ok. Thanks, Ben. Please drop this one :-)

Will do :-)

Cheers,
Ben.