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Message-ID: <ZyJztpWolMiYFN-j@fan>
Date: Wed, 30 Oct 2024 10:58:14 -0700
From: Fan Ni <nifan.cxl@...il.com>
To: ira.weiny@...el.com
Cc: Dave Jiang <dave.jiang@...el.com>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Navneet Singh <navneet.singh@...el.com>,
Jonathan Corbet <corbet@....net>,
Andrew Morton <akpm@...ux-foundation.org>,
Dan Williams <dan.j.williams@...el.com>,
Davidlohr Bueso <dave@...olabs.net>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>, linux-cxl@...r.kernel.org,
linux-doc@...r.kernel.org, nvdimm@...ts.linux.dev,
linux-kernel@...r.kernel.org, Li Ming <ming4.li@...el.com>
Subject: Re: [PATCH v5 18/27] cxl/mem: Configure dynamic capacity interrupts
On Tue, Oct 29, 2024 at 03:34:53PM -0500, ira.weiny@...el.com wrote:
> From: Navneet Singh <navneet.singh@...el.com>
>
> Dynamic Capacity Devices (DCD) support extent change notifications
> through the event log mechanism. The interrupt mailbox commands were
> extended in CXL 3.1 to support these notifications. Firmware can't
> configure DCD events to be FW controlled but can retain control of
> memory events.
>
> Configure DCD event log interrupts on devices supporting dynamic
> capacity. Disable DCD if interrupts are not supported.
>
> Care is taken to preserve the interrupt policy set by the FW if FW first
> has been selected by the BIOS.
>
> Signed-off-by: Navneet Singh <navneet.singh@...el.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> Reviewed-by: Li Ming <ming4.li@...el.com>
> Co-developed-by: Ira Weiny <ira.weiny@...el.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> ---
> Changes:
> [Fan: Don't fail probe on DCD irq failure, just disable dcd and print error]
Reviewed-by: Fan Ni <fan.ni@...sung.com>
Fan
> [Jonathan: move zero'ing of policy to this patch]
> ---
> drivers/cxl/cxlmem.h | 2 ++
> drivers/cxl/pci.c | 73 ++++++++++++++++++++++++++++++++++++++++++----------
> 2 files changed, 62 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 204f7bd9197bd1a02de44ef56a345811d2107ab4..16e06b59d7f04762ca73a81740b0d6b2487301af 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
> @@ -226,7 +226,9 @@ struct cxl_event_interrupt_policy {
> u8 warn_settings;
> u8 failure_settings;
> u8 fatal_settings;
> + u8 dcd_settings;
> } __packed;
> +#define CXL_EVENT_INT_POLICY_BASE_SIZE 4 /* info, warn, failure, fatal */
>
> /**
> * struct cxl_event_state - Event log driver state
> diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
> index ac085a0b4881fc4f074d23f3606f9a3b7e70d05f..13672b8cad5be4b5a955a91e9faaba0a0acd345a 100644
> --- a/drivers/cxl/pci.c
> +++ b/drivers/cxl/pci.c
> @@ -672,23 +672,34 @@ static int cxl_event_get_int_policy(struct cxl_memdev_state *mds,
> }
>
> static int cxl_event_config_msgnums(struct cxl_memdev_state *mds,
> - struct cxl_event_interrupt_policy *policy)
> + struct cxl_event_interrupt_policy *policy,
> + bool native_cxl)
> {
> struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox;
> + size_t size_in = CXL_EVENT_INT_POLICY_BASE_SIZE;
> struct cxl_mbox_cmd mbox_cmd;
> int rc;
>
> - *policy = (struct cxl_event_interrupt_policy) {
> - .info_settings = CXL_INT_MSI_MSIX,
> - .warn_settings = CXL_INT_MSI_MSIX,
> - .failure_settings = CXL_INT_MSI_MSIX,
> - .fatal_settings = CXL_INT_MSI_MSIX,
> - };
> + /* memory event policy is left if FW has control */
> + if (native_cxl) {
> + *policy = (struct cxl_event_interrupt_policy) {
> + .info_settings = CXL_INT_MSI_MSIX,
> + .warn_settings = CXL_INT_MSI_MSIX,
> + .failure_settings = CXL_INT_MSI_MSIX,
> + .fatal_settings = CXL_INT_MSI_MSIX,
> + .dcd_settings = 0,
> + };
> + }
> +
> + if (cxl_dcd_supported(mds)) {
> + policy->dcd_settings = CXL_INT_MSI_MSIX;
> + size_in += sizeof(policy->dcd_settings);
> + }
>
> mbox_cmd = (struct cxl_mbox_cmd) {
> .opcode = CXL_MBOX_OP_SET_EVT_INT_POLICY,
> .payload_in = policy,
> - .size_in = sizeof(*policy),
> + .size_in = size_in,
> };
>
> rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd);
> @@ -735,6 +746,30 @@ static int cxl_event_irqsetup(struct cxl_memdev_state *mds,
> return 0;
> }
>
> +static int cxl_irqsetup(struct cxl_memdev_state *mds,
> + struct cxl_event_interrupt_policy *policy,
> + bool native_cxl)
> +{
> + struct cxl_dev_state *cxlds = &mds->cxlds;
> + int rc;
> +
> + if (native_cxl) {
> + rc = cxl_event_irqsetup(mds, policy);
> + if (rc)
> + return rc;
> + }
> +
> + if (cxl_dcd_supported(mds)) {
> + rc = cxl_event_req_irq(cxlds, policy->dcd_settings);
> + if (rc) {
> + dev_err(cxlds->dev, "Failed to get interrupt for DCD event log\n");
> + cxl_disable_dcd(mds);
> + }
> + }
> +
> + return 0;
> +}
> +
> static bool cxl_event_int_is_fw(u8 setting)
> {
> u8 mode = FIELD_GET(CXLDEV_EVENT_INT_MODE_MASK, setting);
> @@ -760,18 +795,26 @@ static bool cxl_event_validate_mem_policy(struct cxl_memdev_state *mds,
> 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 };
> + bool native_cxl = host_bridge->native_cxl_error;
> int rc;
>
> /*
> * When BIOS maintains CXL error reporting control, it will process
> * event records. Only one agent can do so.
> + *
> + * If BIOS has control of events and DCD is not supported skip event
> + * configuration.
> */
> - if (!host_bridge->native_cxl_error)
> + if (!native_cxl && !cxl_dcd_supported(mds))
> return 0;
>
> if (!irq_avail) {
> dev_info(mds->cxlds.dev, "No interrupt support, disable event processing.\n");
> + if (cxl_dcd_supported(mds)) {
> + dev_info(mds->cxlds.dev, "DCD requires interrupts, disable DCD\n");
> + cxl_disable_dcd(mds);
> + }
> return 0;
> }
>
> @@ -779,10 +822,10 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
> if (rc)
> return rc;
>
> - if (!cxl_event_validate_mem_policy(mds, &policy))
> + if (native_cxl && !cxl_event_validate_mem_policy(mds, &policy))
> return -EBUSY;
>
> - rc = cxl_event_config_msgnums(mds, &policy);
> + rc = cxl_event_config_msgnums(mds, &policy, native_cxl);
> if (rc)
> return rc;
>
> @@ -790,12 +833,16 @@ static int cxl_event_config(struct pci_host_bridge *host_bridge,
> if (rc)
> return rc;
>
> - rc = cxl_event_irqsetup(mds, &policy);
> + rc = cxl_irqsetup(mds, &policy, native_cxl);
> if (rc)
> return rc;
>
> cxl_mem_get_event_records(mds, CXLDEV_EVENT_STATUS_ALL);
>
> + dev_dbg(mds->cxlds.dev, "Event config : %s DCD %s\n",
> + native_cxl ? "OS" : "BIOS",
> + cxl_dcd_supported(mds) ? "supported" : "not supported");
> +
> return 0;
> }
>
>
> --
> 2.47.0
>
--
Fan Ni
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