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Date: Thu, 22 Jun 2023 15:38:22 -0700
From: Dave Jiang <dave.jiang@...el.com>
To: Terry Bowman <terry.bowman@....com>, <alison.schofield@...el.com>,
<vishal.l.verma@...el.com>, <ira.weiny@...el.com>,
<bwidawsk@...nel.org>, <dan.j.williams@...el.com>,
<Jonathan.Cameron@...wei.com>, <linux-cxl@...r.kernel.org>
CC: <rrichter@....com>, <linux-kernel@...r.kernel.org>,
<bhelgaas@...gle.com>
Subject: Re: [PATCH v6 03/27] cxl: Updates for CXL Test to work with RCH
On 6/21/23 20:51, Terry Bowman wrote:
> From: Dan Williams <dan.j.williams@...el.com>
>
> CXL test needs to be updated to work with latest RCH changes.
> Add CXL test support for devm_cxl_add_rch_dport and
> cxl_rcd_component_reg_phys functions.
>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Signed-off-by: Robert Richter <rrichter@....com>
Reviewed-by: Dave Jiang <dave.jiang@...el.com>
> ---
> drivers/cxl/core/core.h | 8 ++++++++
> drivers/cxl/core/port.c | 4 ++--
> drivers/cxl/core/regs.c | 15 +++++++++++----
> drivers/cxl/cxl.h | 11 +++--------
> drivers/cxl/mem.c | 4 ++--
> tools/testing/cxl/Kbuild | 3 ++-
> tools/testing/cxl/test/cxl.c | 10 ----------
> tools/testing/cxl/test/mock.c | 34 +++++++++++++++++++++++++++-------
> tools/testing/cxl/test/mock.h | 3 ---
> 9 files changed, 55 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
> index 27f0968449de..bd0a5788c696 100644
> --- a/drivers/cxl/core/core.h
> +++ b/drivers/cxl/core/core.h
> @@ -63,6 +63,14 @@ int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, unsigned long long size);
> int cxl_dpa_free(struct cxl_endpoint_decoder *cxled);
> resource_size_t cxl_dpa_size(struct cxl_endpoint_decoder *cxled);
> resource_size_t cxl_dpa_resource_start(struct cxl_endpoint_decoder *cxled);
> +
> +enum cxl_rcrb {
> + CXL_RCRB_DOWNSTREAM,
> + CXL_RCRB_UPSTREAM,
> +};
> +resource_size_t __rcrb_to_component(struct device *dev, resource_size_t rcrb,
> + enum cxl_rcrb which);
> +
> extern struct rw_semaphore cxl_dpa_rwsem;
>
> int cxl_memdev_init(void);
> diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
> index 1a3f8729a616..45f5299af7a6 100644
> --- a/drivers/cxl/core/port.c
> +++ b/drivers/cxl/core/port.c
> @@ -939,8 +939,8 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
> return ERR_PTR(-ENOMEM);
>
> if (rcrb != CXL_RESOURCE_NONE) {
> - component_reg_phys = cxl_rcrb_to_component(dport_dev,
> - rcrb, CXL_RCRB_DOWNSTREAM);
> + component_reg_phys = __rcrb_to_component(dport_dev, rcrb,
> + CXL_RCRB_DOWNSTREAM);
> if (component_reg_phys == CXL_RESOURCE_NONE) {
> dev_warn(dport_dev, "Invalid Component Registers in RCRB");
> return ERR_PTR(-ENXIO);
> diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
> index 1476a0299c9b..564dd430258a 100644
> --- a/drivers/cxl/core/regs.c
> +++ b/drivers/cxl/core/regs.c
> @@ -332,9 +332,8 @@ int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
> }
> EXPORT_SYMBOL_NS_GPL(cxl_find_regblock, CXL);
>
> -resource_size_t cxl_rcrb_to_component(struct device *dev,
> - resource_size_t rcrb,
> - enum cxl_rcrb which)
> +resource_size_t __rcrb_to_component(struct device *dev, resource_size_t rcrb,
> + enum cxl_rcrb which)
> {
> resource_size_t component_reg_phys;
> void __iomem *addr;
> @@ -395,4 +394,12 @@ resource_size_t cxl_rcrb_to_component(struct device *dev,
>
> return component_reg_phys;
> }
> -EXPORT_SYMBOL_NS_GPL(cxl_rcrb_to_component, CXL);
> +
> +resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
> + struct cxl_dport *dport)
> +{
> + if (!dport->rch)
> + return CXL_RESOURCE_NONE;
> + return __rcrb_to_component(dev, dport->rcrb, CXL_RCRB_UPSTREAM);
> +}
> +EXPORT_SYMBOL_NS_GPL(cxl_rcd_component_reg_phys, CXL);
> diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
> index a5cd661face2..28888bb0c088 100644
> --- a/drivers/cxl/cxl.h
> +++ b/drivers/cxl/cxl.h
> @@ -262,14 +262,9 @@ int cxl_map_device_regs(struct device *dev, struct cxl_device_regs *regs,
> enum cxl_regloc_type;
> int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
> struct cxl_register_map *map);
> -
> -enum cxl_rcrb {
> - CXL_RCRB_DOWNSTREAM,
> - CXL_RCRB_UPSTREAM,
> -};
> -resource_size_t cxl_rcrb_to_component(struct device *dev,
> - resource_size_t rcrb,
> - enum cxl_rcrb which);
> +struct cxl_dport;
> +resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
> + struct cxl_dport *dport);
>
> #define CXL_RESOURCE_NONE ((resource_size_t) -1)
> #define CXL_TARGET_STRLEN 20
> diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
> index 519edd0eb196..45d4c32d78b0 100644
> --- a/drivers/cxl/mem.c
> +++ b/drivers/cxl/mem.c
> @@ -72,8 +72,8 @@ static int devm_cxl_add_endpoint(struct device *host, struct cxl_memdev *cxlmd,
> * typical register locator mechanism.
> */
> if (parent_dport->rch && cxlds->component_reg_phys == CXL_RESOURCE_NONE)
> - component_reg_phys = cxl_rcrb_to_component(
> - &cxlmd->dev, parent_dport->rcrb, CXL_RCRB_UPSTREAM);
> + component_reg_phys =
> + cxl_rcd_component_reg_phys(&cxlmd->dev, parent_dport);
> else
> component_reg_phys = cxlds->component_reg_phys;
> endpoint = devm_cxl_add_port(host, &cxlmd->dev, component_reg_phys,
> diff --git a/tools/testing/cxl/Kbuild b/tools/testing/cxl/Kbuild
> index 6f9347ade82c..8a87d7d5f7f8 100644
> --- a/tools/testing/cxl/Kbuild
> +++ b/tools/testing/cxl/Kbuild
> @@ -12,7 +12,8 @@ ldflags-y += --wrap=devm_cxl_enumerate_decoders
> ldflags-y += --wrap=cxl_await_media_ready
> ldflags-y += --wrap=cxl_hdm_decode_init
> ldflags-y += --wrap=cxl_dvsec_rr_decode
> -ldflags-y += --wrap=cxl_rcrb_to_component
> +ldflags-y += --wrap=devm_cxl_add_rch_dport
> +ldflags-y += --wrap=cxl_rcd_component_reg_phys
>
> DRIVERS := ../../../drivers
> CXL_SRC := $(DRIVERS)/cxl
> diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
> index bf00dc52fe96..f5c04787bcc8 100644
> --- a/tools/testing/cxl/test/cxl.c
> +++ b/tools/testing/cxl/test/cxl.c
> @@ -971,15 +971,6 @@ static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
> return 0;
> }
>
> -resource_size_t mock_cxl_rcrb_to_component(struct device *dev,
> - resource_size_t rcrb,
> - enum cxl_rcrb which)
> -{
> - dev_dbg(dev, "rcrb: %pa which: %d\n", &rcrb, which);
> -
> - return (resource_size_t) which + 1;
> -}
> -
> static struct cxl_mock_ops cxl_mock_ops = {
> .is_mock_adev = is_mock_adev,
> .is_mock_bridge = is_mock_bridge,
> @@ -988,7 +979,6 @@ static struct cxl_mock_ops cxl_mock_ops = {
> .is_mock_dev = is_mock_dev,
> .acpi_table_parse_cedt = mock_acpi_table_parse_cedt,
> .acpi_evaluate_integer = mock_acpi_evaluate_integer,
> - .cxl_rcrb_to_component = mock_cxl_rcrb_to_component,
> .acpi_pci_find_root = mock_acpi_pci_find_root,
> .devm_cxl_port_enumerate_dports = mock_cxl_port_enumerate_dports,
> .devm_cxl_setup_hdm = mock_cxl_setup_hdm,
> diff --git a/tools/testing/cxl/test/mock.c b/tools/testing/cxl/test/mock.c
> index 284416527644..30119a16ae85 100644
> --- a/tools/testing/cxl/test/mock.c
> +++ b/tools/testing/cxl/test/mock.c
> @@ -259,24 +259,44 @@ int __wrap_cxl_dvsec_rr_decode(struct device *dev, int dvsec,
> }
> EXPORT_SYMBOL_NS_GPL(__wrap_cxl_dvsec_rr_decode, CXL);
>
> -resource_size_t __wrap_cxl_rcrb_to_component(struct device *dev,
> - resource_size_t rcrb,
> - enum cxl_rcrb which)
> +struct cxl_dport *__wrap_devm_cxl_add_rch_dport(struct cxl_port *port,
> + struct device *dport_dev,
> + int port_id,
> + resource_size_t rcrb)
> +{
> + int index;
> + struct cxl_dport *dport;
> + struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
> +
> + if (ops && ops->is_mock_port(dport_dev)) {
> + dport = devm_cxl_add_dport(port, dport_dev, port_id,
> + CXL_RESOURCE_NONE);
> + if (!IS_ERR(dport))
> + dport->rch = true;
> + } else
> + dport = devm_cxl_add_rch_dport(port, dport_dev, port_id, rcrb);
> + put_cxl_mock_ops(index);
> +
> + return dport;
> +}
> +EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_add_rch_dport, CXL);
> +
> +resource_size_t __wrap_cxl_rcd_component_reg_phys(struct device *dev,
> + struct cxl_dport *dport)
> {
> int index;
> resource_size_t component_reg_phys;
> struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
>
> if (ops && ops->is_mock_port(dev))
> - component_reg_phys =
> - ops->cxl_rcrb_to_component(dev, rcrb, which);
> + component_reg_phys = CXL_RESOURCE_NONE;
> else
> - component_reg_phys = cxl_rcrb_to_component(dev, rcrb, which);
> + component_reg_phys = cxl_rcd_component_reg_phys(dev, dport);
> put_cxl_mock_ops(index);
>
> return component_reg_phys;
> }
> -EXPORT_SYMBOL_NS_GPL(__wrap_cxl_rcrb_to_component, CXL);
> +EXPORT_SYMBOL_NS_GPL(__wrap_cxl_rcd_component_reg_phys, CXL);
>
> MODULE_LICENSE("GPL v2");
> MODULE_IMPORT_NS(ACPI);
> diff --git a/tools/testing/cxl/test/mock.h b/tools/testing/cxl/test/mock.h
> index bef8817b01f2..a94223750346 100644
> --- a/tools/testing/cxl/test/mock.h
> +++ b/tools/testing/cxl/test/mock.h
> @@ -15,9 +15,6 @@ struct cxl_mock_ops {
> acpi_string pathname,
> struct acpi_object_list *arguments,
> unsigned long long *data);
> - resource_size_t (*cxl_rcrb_to_component)(struct device *dev,
> - resource_size_t rcrb,
> - enum cxl_rcrb which);
> struct acpi_pci_root *(*acpi_pci_find_root)(acpi_handle handle);
> bool (*is_mock_bus)(struct pci_bus *bus);
> bool (*is_mock_port)(struct device *dev);
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