Re: [PATCH v4 17/28] cxl/events: Split event msgnum configuration from irq setup

Fan Ni
2024-10-10T17:59:03Z

On Mon, Oct 07, 2024 at 06:16:23PM -0500, Ira Weiny wrote:
> Dynamic Capacity Devices (DCD) require event interrupts to process
> memory addition or removal. BIOS may have control over non-DCD event
> processing. DCD interrupt configuration needs to be separate from
> memory event interrupt configuration.
>
> Split cxl_event_config_msgnums() from irq setup in preparation for
> separate DCD interrupts configuration.
>
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> ---
One minor comment inline; otherwise

Reviewed-by: Fan Ni <fan.ni@samsung.com>

> drivers/cxl/pci.c | 24 ++++++++++++------------
> 1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index fc5ab74448cc..29a863331bec 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -702,35 +702,31 @@ static int cxl_event_config_msgnums(struct cxl_memdev_state *mds,
> return cxl_event_get_int_policy(mds, policy);
> }
>
> -static int cxl_event_irqsetup(struct cxl_memdev_state *mds)
> +static int cxl_event_irqsetup(struct cxl_memdev_state *mds,
> + struct cxl_event_interrupt_policy *policy)
> {
> struct cxl_dev_state *cxlds = &mds->cxlds;
> - struct cxl_event_interrupt_policy policy;
> int rc;
>
> - rc = cxl_event_config_msgnums(mds, &policy);
> - if (rc)
> - return rc;
> -
> - rc = cxl_event_req_irq(cxlds, policy.info_settings);
> + rc = cxl_event_req_irq(cxlds, policy->info_settings);
> if (rc) {
> dev_err(cxlds->dev, "Failed to get interrupt for event Info log\n");
> return rc;
> }
>
> - rc = cxl_event_req_irq(cxlds, policy.warn_settings);
> + rc = cxl_event_req_irq(cxlds, policy->warn_settings);
> if (rc) {
> dev_err(cxlds->dev, "Failed to get interrupt for event Warn log\n");
> return rc;
> }
>
> - rc = cxl_event_req_irq(cxlds, policy.failure_settings);
> + rc = cxl_event_req_irq(cxlds, policy->failure_settings);
> if (rc) {
> dev_err(cxlds->dev, "Failed to get interrupt for event Failure log\n");
> return rc;
> }
>
> - rc = cxl_event_req_irq(cxlds, policy.fatal_settings);
> + rc = cxl_event_req_irq(cxlds, policy->fatal_settings);
> if (rc) {
> dev_err(cxlds->dev, "Failed to get interrupt for event Fatal log\n");
> return rc;

There is a lot of duplicate code here, can we simplify it by
iteratting all setttings in cxl_event_interrrupt_policy like

for setting in policy:
rc = cxl_event_req_irq(cxlds, setting);
if (rc) {
...
}

For DCD, handle the setup separately afterwards.

Fan

> @@ -749,7 +745,7 @@ static bool cxl_event_int_is_fw(u8 setting)
> static int cxl_event_config(struct pci_host_bridge *host_bridge,
> struct cxl_memdev_state *mds, bool irq_avail)
> {
> - struct cxl_event_interrupt_policy policy;
> + struct cxl_event_interrupt_policy policy = { 0 };
> int rc;
>
> /*
> @@ -777,11 +773,15 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
> return -EBUSY;
> }
>
> + rc = cxl_event_config_msgnums(mds, &policy);
> + if (rc)
> + return rc;
> +
> rc = cxl_mem_alloc_event_buf(mds);
> if (rc)
> return rc;
>
> - rc = cxl_event_irqsetup(mds);
> + rc = cxl_event_irqsetup(mds, &policy);
> if (rc)
> return rc;
>
>
> --
> 2.46.0
>

--
Fan Ni