Messages in this thread | | | Date | Mon, 12 Jun 2023 13:19:47 -0500 | Subject | Re: [PATCH v5 22/26] cxl/pci: Map RCH downstream AER registers for logging protocol errors | From | Terry Bowman <> |
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Hi Dan,
I'll make the updates you recommended below.
Regards, Terry
On 6/9/23 22:23, Dan Williams wrote: > Terry Bowman wrote: >> The restricted CXL host (RCH) error handler will log protocol errors >> using AER and RAS status registers. The AER and RAS registers need >> to be virtually memory mapped before enabling interrupts. Update >> __devm_cxl_add_dport() to include RCH RAS and AER mapping. >> >> Add 'struct cxl_regs' to 'struct cxl_dport' for saving a unique copy of >> the RCH downstream port's mapped registers. >> >> Co-developed-by: Robert Richter <rrichter@amd.com> >> Signed-off-by: Robert Richter <rrichter@amd.com> >> Signed-off-by: Terry Bowman <terry.bowman@amd.com> >> --- >> drivers/cxl/core/port.c | 38 ++++++++++++++++++++++++++++++++++++++ >> drivers/cxl/core/regs.c | 1 + >> drivers/cxl/cxl.h | 11 +++++++++++ >> 3 files changed, 50 insertions(+) >> >> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c >> index 3111f754c740..bc5d0ee9da54 100644 >> --- a/drivers/cxl/core/port.c >> +++ b/drivers/cxl/core/port.c >> @@ -8,6 +8,7 @@ >> #include <linux/pci.h> >> #include <linux/slab.h> >> #include <linux/idr.h> >> +#include <linux/aer.h> >> #include <cxlmem.h> >> #include <cxlpci.h> >> #include <cxl.h> >> @@ -947,6 +948,39 @@ static void cxl_dport_unlink(void *data) >> sysfs_remove_link(&port->dev.kobj, link_name); >> } >> >> +static int cxl_dport_map_rch_aer(struct cxl_dport *dport) >> +{ >> + struct cxl_rcrb_info *ri = &dport->rcrb; >> + resource_size_t aer_phys; >> + void __iomem *dport_aer; >> + >> + if (!dport->rch || !ri->aer_cap) >> + return -ENODEV; >> + >> + aer_phys = ri->aer_cap + ri->base; >> + dport_aer = devm_cxl_iomap_block(dport->dev, aer_phys, >> + sizeof(struct aer_capability_regs)); > > @dport->dev is not suitable to be the @host argument to > devm_cxl_iomap_block(). It needs to match the lifetime of the @dport > allocation which means @host needs to be set to @port->dev. > > >> + if (!dport_aer) >> + return -ENOMEM; >> + >> + dport->regs.dport_aer = dport_aer; >> + >> + return 0; >> +} >> + >> +static int cxl_dport_map_regs(struct cxl_dport *dport) >> +{ >> + struct cxl_register_map *map = &dport->comp_map; >> + >> + if (!map->component_map.ras.valid) >> + dev_dbg(map->dev, "RAS registers not found\n"); >> + else if (cxl_map_component_regs(map, &dport->regs.component, >> + BIT(CXL_CM_CAP_CAP_ID_RAS))) >> + dev_dbg(dport->dev, "Failed to map RAS capability.\n"); >> + >> + return cxl_dport_map_rch_aer(dport); >> +} >> + >> static struct cxl_dport * >> __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev, >> int port_id, resource_size_t component_reg_phys, >> @@ -1000,6 +1034,10 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev, >> if (rc && rc != -ENODEV) >> return ERR_PTR(rc); >> >> + rc = cxl_dport_map_regs(dport); >> + if (rc && rc != -ENODEV) >> + return ERR_PTR(rc); > > I'll repeat the previous comment about replacing: > > if (rc && rc != -ENODEV) > > ...with an optional initialization at alloc time. > >> + >> cond_cxl_root_lock(port); >> rc = add_dport(port, dport); >> cond_cxl_root_unlock(port); >> diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c >> index dd6c3c898cff..26fb4f395365 100644 >> --- a/drivers/cxl/core/regs.c >> +++ b/drivers/cxl/core/regs.c >> @@ -198,6 +198,7 @@ void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, >> >> return ret_val; >> } >> +EXPORT_SYMBOL_NS_GPL(devm_cxl_iomap_block, CXL); >> >> int cxl_map_component_regs(struct cxl_register_map *map, >> struct cxl_component_regs *regs, >> diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h >> index 6134644b51f8..0e0bcbefefaf 100644 >> --- a/drivers/cxl/cxl.h >> +++ b/drivers/cxl/cxl.h >> @@ -209,6 +209,13 @@ struct cxl_regs { >> struct_group_tagged(cxl_device_regs, device_regs, >> void __iomem *status, *mbox, *memdev; >> ); >> + /* >> + * RCH downstream port specific RAS register >> + * @aer: CXL 3.0 8.2.1.1 RCH Downstream Port RCRB >> + */ >> + struct_group_tagged(cxl_rch_regs, rch_regs, >> + void __iomem *dport_aer; >> + ); >> }; >> >> struct cxl_reg_map { >> @@ -255,6 +262,8 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base, >> struct cxl_component_reg_map *map); >> void cxl_probe_device_regs(struct device *dev, void __iomem *base, >> struct cxl_device_reg_map *map); >> +void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr, >> + resource_size_t length); >> int cxl_map_component_regs(struct cxl_register_map *map, >> struct cxl_component_regs *regs, >> unsigned long map_mask); >> @@ -603,6 +612,7 @@ struct cxl_rcrb_info { >> * @port_id: unique hardware identifier for dport in decoder target list >> * @rch: Indicate whether this dport was enumerated in RCH or VH mode >> * @rcrb: Data about the Root Complex Register Block layout >> + * @regs: Dport parsed register blocks >> */ >> struct cxl_dport { >> struct device *dev; >> @@ -611,6 +621,7 @@ struct cxl_dport { >> int port_id; >> bool rch; >> struct cxl_rcrb_info rcrb; >> + struct cxl_regs regs; >> }; >> >> /** >> -- >> 2.34.1 >> > >
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