From 860bafce98aca84ac5fc8f4b7d58d28d4dd3ce64 Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Mon, 27 Jul 2020 11:10:59 -0400 Subject: [PATCH] PCI/AER: Refactor error injection fallbacks task #29600094 commit e51cd9ce5dd3b10f9e67a30a4dc00fc1fa80c673 upstream. Backport summary: for 4.19 kernel ICX PCIe Gen4 support. Move the bus ops fallback into separate functions. No functional change here. Signed-off-by: Keith Busch Signed-off-by: Bjorn Helgaas (cherry picked from commit e51cd9ce5dd3b10f9e67a30a4dc00fc1fa80c673) Signed-off-by: Ethan Zhao Signed-off-by: Artie Ding Acked-by: Caspar Zhang --- drivers/pci/pcie/aer_inject.c | 66 ++++++++++++++++++++--------------- 1 file changed, 38 insertions(+), 28 deletions(-) diff --git a/drivers/pci/pcie/aer_inject.c b/drivers/pci/pcie/aer_inject.c index 726987f8d53c..95d4759664b3 100644 --- a/drivers/pci/pcie/aer_inject.c +++ b/drivers/pci/pcie/aer_inject.c @@ -176,14 +176,48 @@ static u32 *find_pci_config_dword(struct aer_error *err, int where, return target; } +static int aer_inj_read(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 *val) +{ + struct pci_ops *ops, *my_ops; + int rv; + + ops = __find_pci_bus_ops(bus); + if (!ops) + return -1; + + my_ops = bus->ops; + bus->ops = ops; + rv = ops->read(bus, devfn, where, size, val); + bus->ops = my_ops; + + return rv; +} + +static int aer_inj_write(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 val) +{ + struct pci_ops *ops, *my_ops; + int rv; + + ops = __find_pci_bus_ops(bus); + if (!ops) + return -1; + + my_ops = bus->ops; + bus->ops = ops; + rv = ops->write(bus, devfn, where, size, val); + bus->ops = my_ops; + + return rv; +} + static int aer_inj_read_config(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val) { u32 *sim; struct aer_error *err; unsigned long flags; - struct pci_ops *ops; - struct pci_ops *my_ops; int domain; int rv; @@ -204,18 +238,7 @@ static int aer_inj_read_config(struct pci_bus *bus, unsigned int devfn, return 0; } out: - ops = __find_pci_bus_ops(bus); - /* - * pci_lock must already be held, so we can directly - * manipulate bus->ops. Many config access functions, - * including pci_generic_config_read() require the original - * bus->ops be installed to function, so temporarily put them - * back. - */ - my_ops = bus->ops; - bus->ops = ops; - rv = ops->read(bus, devfn, where, size, val); - bus->ops = my_ops; + rv = aer_inj_read(bus, devfn, where, size, val); spin_unlock_irqrestore(&inject_lock, flags); return rv; } @@ -227,8 +250,6 @@ static int aer_inj_write_config(struct pci_bus *bus, unsigned int devfn, struct aer_error *err; unsigned long flags; int rw1cs; - struct pci_ops *ops; - struct pci_ops *my_ops; int domain; int rv; @@ -252,18 +273,7 @@ static int aer_inj_write_config(struct pci_bus *bus, unsigned int devfn, return 0; } out: - ops = __find_pci_bus_ops(bus); - /* - * pci_lock must already be held, so we can directly - * manipulate bus->ops. Many config access functions, - * including pci_generic_config_write() require the original - * bus->ops be installed to function, so temporarily put them - * back. - */ - my_ops = bus->ops; - bus->ops = ops; - rv = ops->write(bus, devfn, where, size, val); - bus->ops = my_ops; + rv = aer_inj_write(bus, devfn, where, size, val); spin_unlock_irqrestore(&inject_lock, flags); return rv; } -- GitLab