[PATCH v2] cxl: Dump PSL_FIR register on PSL9 error irq

[Andrew Donnellan]

On 11/10/17 17:14, Vaibhav Jain wrote:
> For PSL9 currently we aren't dumping the PSL FIR register when a
> PSL error interrupt is triggered. Contents of this register are useful
> in debugging AFU issues.
> 
> This patch fixes issue by adding a new service_layer_ops callback
> cxl_native_err_irq_dump_regs_psl9() to dump the PSL_FIR registers on a
> PSL error interrupt thereby bringing the behavior in line with PSL on
> POWER-8. Also the existing service_layer_ops callback
> for PSL8 has been renamed to cxl_native_err_irq_dump_regs_psl8().
> 
> Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>

Acked-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

> ---
> Changelog:
> [v2] -> As created a different function to dump the FIR register for PSL9 (Fred)
> ---
> 
>   drivers/misc/cxl/cxl.h    |  3 ++-
>   drivers/misc/cxl/native.c | 15 ++++++++++++---
>   drivers/misc/cxl/pci.c    |  3 ++-
>   3 files changed, 16 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
> index 252373c2b861..111c689b1771 100644
> --- a/drivers/misc/cxl/cxl.h
> +++ b/drivers/misc/cxl/cxl.h
> @@ -1072,7 +1072,8 @@ u64 cxl_calculate_sr(bool master, bool kernel, bool real_mode, bool p9);
>   
>   void cxl_native_irq_dump_regs_psl9(struct cxl_context *ctx);
>   void cxl_native_irq_dump_regs_psl8(struct cxl_context *ctx);
> -void cxl_native_err_irq_dump_regs(struct cxl *adapter);
> +void cxl_native_err_irq_dump_regs_psl8(struct cxl *adapter);
> +void cxl_native_err_irq_dump_regs_psl9(struct cxl *adapter);
>   int cxl_pci_vphb_add(struct cxl_afu *afu);
>   void cxl_pci_vphb_remove(struct cxl_afu *afu);
>   void cxl_release_mapping(struct cxl_context *ctx);
> diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
> index 6cd57c756927..02b6b45b4c20 100644
> --- a/drivers/misc/cxl/native.c
> +++ b/drivers/misc/cxl/native.c
> @@ -1263,14 +1263,23 @@ static irqreturn_t native_slice_irq_err(int irq, void *data)
>   	return IRQ_HANDLED;
>   }
>   
> -void cxl_native_err_irq_dump_regs(struct cxl *adapter)
> +void cxl_native_err_irq_dump_regs_psl9(struct cxl *adapter)
> +{
> +	u64 fir1;
> +
> +	fir1 = cxl_p1_read(adapter, CXL_PSL9_FIR1);
> +	dev_crit(&adapter->dev, "PSL_FIR: 0x%016llx\n", fir1);
> +}
> +
> +void cxl_native_err_irq_dump_regs_psl8(struct cxl *adapter)
>   {
>   	u64 fir1, fir2;
>   
>   	fir1 = cxl_p1_read(adapter, CXL_PSL_FIR1);
>   	fir2 = cxl_p1_read(adapter, CXL_PSL_FIR2);
> -
> -	dev_crit(&adapter->dev, "PSL_FIR1: 0x%016llx\nPSL_FIR2: 0x%016llx\n", fir1, fir2);
> +	dev_crit(&adapter->dev,
> +		 "PSL_FIR1: 0x%016llx\nPSL_FIR2: 0x%016llx\n",
> +		 fir1, fir2);
>   }
>   
>   static irqreturn_t native_irq_err(int irq, void *data)
> diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
> index b4ce9ea113a9..d185b47eb536 100644
> --- a/drivers/misc/cxl/pci.c
> +++ b/drivers/misc/cxl/pci.c
> @@ -1763,6 +1763,7 @@ static const struct cxl_service_layer_ops psl9_ops = {
>   	.debugfs_add_adapter_regs = cxl_debugfs_add_adapter_regs_psl9,
>   	.debugfs_add_afu_regs = cxl_debugfs_add_afu_regs_psl9,
>   	.psl_irq_dump_registers = cxl_native_irq_dump_regs_psl9,
> +	.err_irq_dump_registers = cxl_native_err_irq_dump_regs_psl9,
>   	.debugfs_stop_trace = cxl_stop_trace_psl9,
>   	.write_timebase_ctrl = write_timebase_ctrl_psl9,
>   	.timebase_read = timebase_read_psl9,
> @@ -1786,7 +1787,7 @@ static const struct cxl_service_layer_ops psl8_ops = {
>   	.debugfs_add_adapter_regs = cxl_debugfs_add_adapter_regs_psl8,
>   	.debugfs_add_afu_regs = cxl_debugfs_add_afu_regs_psl8,
>   	.psl_irq_dump_registers = cxl_native_irq_dump_regs_psl8,
> -	.err_irq_dump_registers = cxl_native_err_irq_dump_regs,
> +	.err_irq_dump_registers = cxl_native_err_irq_dump_regs_psl8,
>   	.debugfs_stop_trace = cxl_stop_trace_psl8,
>   	.write_timebase_ctrl = write_timebase_ctrl_psl8,
>   	.timebase_read = timebase_read_psl8,
> 

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com  IBM Australia Limited