On Thu, Sep 01, 2016 at 01:23:45PM -0500, Bjorn Helgaas wrote:

On Mon, Aug 08, 2016 at 03:05:37PM +0200, Tomasz Nowicki wrote:

quoted

pci_config_window keeps pointer to pci_ecam_ops and every time
we want to deallocate pci_config_window (pci_ecam_free()) we need to make
sure to free pci_ecam_ops in case it was dynamically allocated prior to
pci_ecam_create() call.

I think this is a theoretical problem, right?  All the current callers
pass a pointer to a static pci_ecam_ops struct that does not need to
be deallocated.

I see that the next patch uses a pci_ecam_ops struct on the stack,

I asked Tomasz why we need to have pci_ecam_ops on the stack in the
first place since I do not think it is needed, or nicer (actually I
think it is not nice at all, what's the problem in making it static ?).

Anyway, that's part of this thread but I think Tomasz was looking
more for feedback/agreement on the whole quirks mechanism to check
if it is fine, more below.

which would definitely cause issues without this patch, so I agree we
need something like this; I'm just trying to make the changelog make
more sense.

quoted

To avoid that extra effort, embed pci_ecam_ops in pci_config_window,
instead of just a pointer.

Signed-off-by: Tomasz Nowicki <redacted>
To: Jayachandran C <redacted>

This looks like an editing mistake?

Yes it is.

I think the most important bit about this series is to agree on
whether it is ok to keep quirks in drivers/pci/host/mcfg-quirks.c
or we need to find a different dir for it, and of course to make
sure the quirks mechanism is fine with everyone.

Thanks !
Lorenzo

quoted

 arch/arm64/kernel/pci.c  | 2 +-
 drivers/pci/ecam.c       | 6 +++---
 include/linux/pci-ecam.h | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index acf3872..981e828 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c

@@ -183,7 +183,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 		return NULL;
 	}
 
-	acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
+	acpi_pci_root_ops.pci_ops = &ri->cfg->ops.pci_ops;
 	bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
 				   ri->cfg);
 	if (!bus)

diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
index 43ed08d..24242f0 100644
--- a/drivers/pci/ecam.c
+++ b/drivers/pci/ecam.c

@@ -52,7 +52,7 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
 		return ERR_PTR(-ENOMEM);
 
 	cfg->parent = dev;
-	cfg->ops = ops;
+	cfg->ops = *ops;
 	cfg->busr.start = busr->start;
 	cfg->busr.end = busr->end;
 	cfg->busr.flags = IORESOURCE_BUS;

@@ -138,7 +138,7 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
 			       int where)
 {
 	struct pci_config_window *cfg = bus->sysdata;
-	unsigned int devfn_shift = cfg->ops->bus_shift - 8;
+	unsigned int devfn_shift = cfg->ops.bus_shift - 8;
 	unsigned int busn = bus->number;
 	void __iomem *base;
 

@@ -149,7 +149,7 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn,
 	if (per_bus_mapping)
 		base = cfg->winp[busn];
 	else
-		base = cfg->win + (busn << cfg->ops->bus_shift);
+		base = cfg->win + (busn << cfg->ops.bus_shift);
 	return base + (devfn << devfn_shift) + where;
 }
 

diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 7adad20..0ce2920 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h

@@ -39,7 +39,7 @@ struct pci_config_window {
 	struct resource			res;
 	struct resource			busr;
 	void				*priv;
-	struct pci_ecam_ops		*ops;
+	struct pci_ecam_ops		ops;
 	union {
 		void __iomem		*win;	/* 64-bit single mapping */
 		void __iomem		**winp; /* 32-bit per-bus mapping */

-- 
1.9.1