From 3780444c4fcec28c96ab7002858bb051215a5fc1 Mon Sep 17 00:00:00 2001 From: Gavin Shan Date: Mon, 27 Feb 2012 20:04:11 +0000 Subject: [PATCH] powerpc/eeh: pseries platform config space access in EEH With the original EEH implementation, the access to config space of the corresponding PCI device is done by RTAS sensitive function. That depends on pci_dn heavily. That would limit EEH extension to other platforms like powernv because other platforms might have different ways to access PCI config space. The patch splits those functions used to access PCI config space and implement them in platform related EEH component. It would be helpful to support EEH on multiple platforms simutaneously in future. Signed-off-by: Gavin Shan Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/include/asm/eeh.h | 2 + arch/powerpc/platforms/pseries/eeh.c | 32 ++++++++-------- arch/powerpc/platforms/pseries/eeh_pseries.c | 40 +++++++++++++++++++- 3 files changed, 57 insertions(+), 17 deletions(-) diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h index daaad91ed576..d60f99814ffb 100644 --- a/arch/powerpc/include/asm/eeh.h +++ b/arch/powerpc/include/asm/eeh.h @@ -102,6 +102,8 @@ struct eeh_ops { int (*wait_state)(struct device_node *dn, int max_wait); int (*get_log)(struct device_node *dn, int severity, char *drv_log, unsigned long len); int (*configure_bridge)(struct device_node *dn); + int (*read_config)(struct device_node *dn, int where, int size, u32 *val); + int (*write_config)(struct device_node *dn, int where, int size, u32 val); }; extern struct eeh_ops *eeh_ops; diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c index 1d08cd76e68d..8011088392d3 100644 --- a/arch/powerpc/platforms/pseries/eeh.c +++ b/arch/powerpc/platforms/pseries/eeh.c @@ -141,11 +141,11 @@ static size_t eeh_gather_pci_data(struct eeh_dev *edev, char * buf, size_t len) n += scnprintf(buf+n, len-n, "%s\n", dn->full_name); printk(KERN_WARNING "EEH: of node=%s\n", dn->full_name); - rtas_read_config(PCI_DN(dn), PCI_VENDOR_ID, 4, &cfg); + eeh_ops->read_config(dn, PCI_VENDOR_ID, 4, &cfg); n += scnprintf(buf+n, len-n, "dev/vend:%08x\n", cfg); printk(KERN_WARNING "EEH: PCI device/vendor: %08x\n", cfg); - rtas_read_config(PCI_DN(dn), PCI_COMMAND, 4, &cfg); + eeh_ops->read_config(dn, PCI_COMMAND, 4, &cfg); n += scnprintf(buf+n, len-n, "cmd/stat:%x\n", cfg); printk(KERN_WARNING "EEH: PCI cmd/status register: %08x\n", cfg); @@ -156,11 +156,11 @@ static size_t eeh_gather_pci_data(struct eeh_dev *edev, char * buf, size_t len) /* Gather bridge-specific registers */ if (dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) { - rtas_read_config(PCI_DN(dn), PCI_SEC_STATUS, 2, &cfg); + eeh_ops->read_config(dn, PCI_SEC_STATUS, 2, &cfg); n += scnprintf(buf+n, len-n, "sec stat:%x\n", cfg); printk(KERN_WARNING "EEH: Bridge secondary status: %04x\n", cfg); - rtas_read_config(PCI_DN(dn), PCI_BRIDGE_CONTROL, 2, &cfg); + eeh_ops->read_config(dn, PCI_BRIDGE_CONTROL, 2, &cfg); n += scnprintf(buf+n, len-n, "brdg ctl:%x\n", cfg); printk(KERN_WARNING "EEH: Bridge control: %04x\n", cfg); } @@ -168,11 +168,11 @@ static size_t eeh_gather_pci_data(struct eeh_dev *edev, char * buf, size_t len) /* Dump out the PCI-X command and status regs */ cap = pci_find_capability(dev, PCI_CAP_ID_PCIX); if (cap) { - rtas_read_config(PCI_DN(dn), cap, 4, &cfg); + eeh_ops->read_config(dn, cap, 4, &cfg); n += scnprintf(buf+n, len-n, "pcix-cmd:%x\n", cfg); printk(KERN_WARNING "EEH: PCI-X cmd: %08x\n", cfg); - rtas_read_config(PCI_DN(dn), cap+4, 4, &cfg); + eeh_ops->read_config(dn, cap+4, 4, &cfg); n += scnprintf(buf+n, len-n, "pcix-stat:%x\n", cfg); printk(KERN_WARNING "EEH: PCI-X status: %08x\n", cfg); } @@ -185,7 +185,7 @@ static size_t eeh_gather_pci_data(struct eeh_dev *edev, char * buf, size_t len) "EEH: PCI-E capabilities and status follow:\n"); for (i=0; i<=8; i++) { - rtas_read_config(PCI_DN(dn), cap+4*i, 4, &cfg); + eeh_ops->read_config(dn, cap+4*i, 4, &cfg); n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg); printk(KERN_WARNING "EEH: PCI-E %02x: %08x\n", i, cfg); } @@ -197,7 +197,7 @@ static size_t eeh_gather_pci_data(struct eeh_dev *edev, char * buf, size_t len) "EEH: PCI-E AER capability register set follows:\n"); for (i=0; i<14; i++) { - rtas_read_config(PCI_DN(dn), cap+4*i, 4, &cfg); + eeh_ops->read_config(dn, cap+4*i, 4, &cfg); n += scnprintf(buf+n, len-n, "%02x:%x\n", 4*i, cfg); printk(KERN_WARNING "EEH: PCI-E AER %02x: %08x\n", i, cfg); } @@ -746,28 +746,28 @@ static inline void eeh_restore_one_device_bars(struct eeh_dev *edev) return; for (i=4; i<10; i++) { - rtas_write_config(PCI_DN(dn), i*4, 4, edev->config_space[i]); + eeh_ops->write_config(dn, i*4, 4, edev->config_space[i]); } /* 12 == Expansion ROM Address */ - rtas_write_config(PCI_DN(dn), 12*4, 4, edev->config_space[12]); + eeh_ops->write_config(dn, 12*4, 4, edev->config_space[12]); #define BYTE_SWAP(OFF) (8*((OFF)/4)+3-(OFF)) #define SAVED_BYTE(OFF) (((u8 *)(edev->config_space))[BYTE_SWAP(OFF)]) - rtas_write_config(PCI_DN(dn), PCI_CACHE_LINE_SIZE, 1, + eeh_ops->write_config(dn, PCI_CACHE_LINE_SIZE, 1, SAVED_BYTE(PCI_CACHE_LINE_SIZE)); - rtas_write_config(PCI_DN(dn), PCI_LATENCY_TIMER, 1, + eeh_ops->write_config(dn, PCI_LATENCY_TIMER, 1, SAVED_BYTE(PCI_LATENCY_TIMER)); /* max latency, min grant, interrupt pin and line */ - rtas_write_config(PCI_DN(dn), 15*4, 4, edev->config_space[15]); + eeh_ops->write_config(dn, 15*4, 4, edev->config_space[15]); /* Restore PERR & SERR bits, some devices require it, * don't touch the other command bits */ - rtas_read_config(PCI_DN(dn), PCI_COMMAND, 4, &cmd); + eeh_ops->read_config(dn, PCI_COMMAND, 4, &cmd); if (edev->config_space[1] & PCI_COMMAND_PARITY) cmd |= PCI_COMMAND_PARITY; else @@ -776,7 +776,7 @@ static inline void eeh_restore_one_device_bars(struct eeh_dev *edev) cmd |= PCI_COMMAND_SERR; else cmd &= ~PCI_COMMAND_SERR; - rtas_write_config(PCI_DN(dn), PCI_COMMAND, 4, cmd); + eeh_ops->write_config(dn, PCI_COMMAND, 4, cmd); } /** @@ -818,7 +818,7 @@ static void eeh_save_bars(struct eeh_dev *edev) dn = eeh_dev_to_of_node(edev); for (i = 0; i < 16; i++) - rtas_read_config(PCI_DN(dn), i * 4, 4, &edev->config_space[i]); + eeh_ops->read_config(dn, i * 4, 4, &edev->config_space[i]); } /** diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c index 36a1af1d1140..8752f79a6af8 100644 --- a/arch/powerpc/platforms/pseries/eeh_pseries.c +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c @@ -503,6 +503,42 @@ static int pseries_eeh_configure_bridge(struct device_node *dn) return ret; } +/** + * pseries_eeh_read_config - Read PCI config space + * @dn: device node + * @where: PCI address + * @size: size to read + * @val: return value + * + * Read config space from the speicifed device + */ +static int pseries_eeh_read_config(struct device_node *dn, int where, int size, u32 *val) +{ + struct pci_dn *pdn; + + pdn = PCI_DN(dn); + + return rtas_read_config(pdn, where, size, val); +} + +/** + * pseries_eeh_write_config - Write PCI config space + * @dn: device node + * @where: PCI address + * @size: size to write + * @val: value to be written + * + * Write config space to the specified device + */ +static int pseries_eeh_write_config(struct device_node *dn, int where, int size, u32 val) +{ + struct pci_dn *pdn; + + pdn = PCI_DN(dn); + + return rtas_write_config(pdn, where, size, val); +} + static struct eeh_ops pseries_eeh_ops = { .name = "pseries", .init = pseries_eeh_init, @@ -512,7 +548,9 @@ static struct eeh_ops pseries_eeh_ops = { .reset = pseries_eeh_reset, .wait_state = pseries_eeh_wait_state, .get_log = pseries_eeh_get_log, - .configure_bridge = pseries_eeh_configure_bridge + .configure_bridge = pseries_eeh_configure_bridge, + .read_config = pseries_eeh_read_config, + .write_config = pseries_eeh_write_config }; /** -- 2.34.1