| Message ID | 20241021134654.337368-2-Basavaraj.Natikar@amd.com (mailing list archive) |
|---|---|
| State | Changes Requested, archived |
| Headers | show |
| Series | Add support of AMD 3D V-Cache optimizer driver | expand |
Am 21.10.24 um 15:46 schrieb Basavaraj Natikar: > AMD X3D processors, also known as AMD 3D V-Cache, feature dual Core > Complex Dies (CCDs) and enlarged L3 cache, enabling dynamic mode > switching between Frequency and Cache modes. To optimize performance, > implement the AMD 3D V-Cache Optimizer, which allows selecting either: > > Frequency mode: cores within the faster CCD are prioritized before > those in the slower CCD. > > Cache mode: cores within the larger L3 CCD are prioritized before > those in the smaller L3 CCD. > > Co-developed-by: Perry Yuan <perry.yuan@amd.com> > Signed-off-by: Perry Yuan <perry.yuan@amd.com> > Co-developed-by: Mario Limonciello <mario.limonciello@amd.com> > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> > Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> > Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com> > --- > MAINTAINERS | 7 ++ > drivers/platform/x86/amd/Kconfig | 12 ++ > drivers/platform/x86/amd/Makefile | 2 + > drivers/platform/x86/amd/x3d_vcache.c | 160 ++++++++++++++++++++++++++ > 4 files changed, 181 insertions(+) > create mode 100644 drivers/platform/x86/amd/x3d_vcache.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index e9659a5a7fb3..11b829956499 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -965,6 +965,13 @@ Q: https://patchwork.kernel.org/project/linux-rdma/list/ > F: drivers/infiniband/hw/efa/ > F: include/uapi/rdma/efa-abi.h > > +AMD 3D V-CACHE PERFORMANCE OPTIMIZER DRIVER > +M: Basavaraj Natikar <Basavaraj.Natikar@amd.com> > +R: Mario Limonciello <mario.limonciello@amd.com> > +L: platform-driver-x86@vger.kernel.org > +S: Supported > +F: drivers/platform/x86/amd/x3d_vcache.c > + > AMD ADDRESS TRANSLATION LIBRARY (ATL) > M: Yazen Ghannam <Yazen.Ghannam@amd.com> > L: linux-edac@vger.kernel.org > diff --git a/drivers/platform/x86/amd/Kconfig b/drivers/platform/x86/amd/Kconfig > index f88682d36447..d73f691020d0 100644 > --- a/drivers/platform/x86/amd/Kconfig > +++ b/drivers/platform/x86/amd/Kconfig > @@ -6,6 +6,18 @@ > source "drivers/platform/x86/amd/pmf/Kconfig" > source "drivers/platform/x86/amd/pmc/Kconfig" > > +config AMD_3D_VCACHE > + tristate "AMD 3D V-Cache Performance Optimizer Driver" > + depends on X86_64 && ACPI > + help > + The driver provides a sysfs interface, enabling the setting of a bias > + that alters CPU core reordering. This bias prefers cores with higher > + frequencies or larger L3 caches on processors supporting AMD 3D V-Cache > + technology. > + > + If you choose to compile this driver as a module the module will be > + called amd_3d_vcache. > + > config AMD_HSMP > tristate "AMD HSMP Driver" > depends on AMD_NB && X86_64 && ACPI > diff --git a/drivers/platform/x86/amd/Makefile b/drivers/platform/x86/amd/Makefile > index dcec0a46f8af..16e4cce02242 100644 > --- a/drivers/platform/x86/amd/Makefile > +++ b/drivers/platform/x86/amd/Makefile > @@ -4,6 +4,8 @@ > # AMD x86 Platform-Specific Drivers > # > > +obj-$(CONFIG_AMD_3D_VCACHE) += amd_3d_vcache.o > +amd_3d_vcache-objs := x3d_vcache.o > obj-$(CONFIG_AMD_PMC) += pmc/ > amd_hsmp-y := hsmp.o > obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o > diff --git a/drivers/platform/x86/amd/x3d_vcache.c b/drivers/platform/x86/amd/x3d_vcache.c > new file mode 100644 > index 000000000000..ec861e7b5e1e > --- /dev/null > +++ b/drivers/platform/x86/amd/x3d_vcache.c > @@ -0,0 +1,160 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * AMD 3D V-Cache Performance Optimizer Driver > + * > + * Copyright (c) 2024, Advanced Micro Devices, Inc. > + * All Rights Reserved. > + * > + * Authors: Basavaraj Natikar <Basavaraj.Natikar@amd.com> > + * Perry Yuan <perry.yuan@amd.com> > + * Mario Limonciello <mario.limonciello@amd.com> > + * > + */ > + > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > + > +#include <linux/acpi.h> > +#include <linux/device.h> > +#include <linux/errno.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/platform_device.h> > + > +static char *x3d_mode = "frequency"; > +module_param(x3d_mode, charp, 0444); Hi, does userspace really need to know the value of this modparam? If no, then please change the visibility to 0. > +MODULE_PARM_DESC(x3d_mode, "Initial 3D-VCache mode; 'frequency' (default) or 'cache'"); > + > +#define DSM_REVISION_ID 0 > +#define DSM_SET_X3D_MODE 1 > + > +static guid_t x3d_guid = GUID_INIT(0xdff8e55f, 0xbcfd, 0x46fb, 0xba, 0x0a, > + 0xef, 0xd0, 0x45, 0x0f, 0x34, 0xee); > + > +enum amd_x3d_mode_type { > + MODE_INDEX_FREQ, > + MODE_INDEX_CACHE, > +}; > + > +static const char * const amd_x3d_mode_strings[] = { > + [MODE_INDEX_FREQ] = "frequency", > + [MODE_INDEX_CACHE] = "cache", > +}; > + > +struct amd_x3d_dev { > + struct device *dev; > + acpi_handle ahandle; > + /* To protect x3d mode setting */ > + struct mutex lock; > + enum amd_x3d_mode_type curr_mode; > +}; > + > +static int amd_x3d_mode_switch(struct amd_x3d_dev *data, int new_state) > +{ > + union acpi_object *out, argv; > + > + guard(mutex)(&data->lock); > + argv.type = ACPI_TYPE_INTEGER; > + argv.integer.value = new_state; > + > + out = acpi_evaluate_dsm(data->ahandle, &x3d_guid, DSM_REVISION_ID, DSM_SET_X3D_MODE, > + &argv); > + if (!out) { > + dev_err(data->dev, "failed to evaluate _DSM\n"); > + return -EINVAL; > + } > + > + data->curr_mode = new_state; > + > + kfree(out); > + > + return 0; > +} > + > +static ssize_t amd_x3d_mode_store(struct device *dev, struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct amd_x3d_dev *data = dev_get_drvdata(dev); > + int ret; > + > + ret = sysfs_match_string(amd_x3d_mode_strings, buf); > + if (ret < 0) { > + dev_err(dev, "no matching mode to set %s\n", buf); Maybe just return ret here without printing anything. Otherwise userspace could spam the kernel log by continuously writing invalid strings. > + return ret; > + } > + > + ret = amd_x3d_mode_switch(data, ret); > + if (ret < 0) > + return ret; > + > + return count; > +} > + > +static ssize_t amd_x3d_mode_show(struct device *dev, struct device_attribute *attr, char *buf) > +{ > + struct amd_x3d_dev *data = dev_get_drvdata(dev); > + > + if (!(data->curr_mode == MODE_INDEX_CACHE || data->curr_mode == MODE_INDEX_FREQ)) > + return -EINVAL; Can this error condition even be triggered? > + > + return sysfs_emit(buf, "%s\n", amd_x3d_mode_strings[data->curr_mode]); Please use data->lock here to protect accesses to data->curr_mode. > +} > +static DEVICE_ATTR_RW(amd_x3d_mode); > + > +static struct attribute *amd_x3d_attrs[] = { > + &dev_attr_amd_x3d_mode.attr, > + NULL > +}; > +ATTRIBUTE_GROUPS(amd_x3d); > + > +static const struct acpi_device_id amd_x3d_acpi_ids[] = { > + {"AMDI0101"}, > + { }, > +}; > +MODULE_DEVICE_TABLE(acpi, amd_x3d_acpi_ids); > + > +static int amd_x3d_probe(struct platform_device *pdev) > +{ > + struct amd_x3d_dev *data; > + acpi_handle handle; > + int ret; > + > + handle = ACPI_HANDLE(&pdev->dev); > + if (!handle) > + return -ENODEV; > + > + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + data->dev = &pdev->dev; > + data->ahandle = handle; > + platform_set_drvdata(pdev, data); > + > + if (!acpi_check_dsm(handle, &x3d_guid, DSM_REVISION_ID, BIT(DSM_SET_X3D_MODE))) > + return dev_err_probe(&pdev->dev, -ENODEV, "not supported on this platform\n"); Please do this check before allocating anything, because the driver should bail out as soon as possible when encountering unsupported hardware. Also maybe being silent and just returning -ENODEV is better as this error message serves no purpose. > + > + ret = match_string(amd_x3d_mode_strings, ARRAY_SIZE(amd_x3d_mode_strings), x3d_mode); > + if (ret < 0) > + return dev_err_probe(&pdev->dev, -EINVAL, "invalid mode %s\n", x3d_mode); > + > + devm_mutex_init(data->dev, &data->lock); > + > + ret = amd_x3d_mode_switch(data, ret); > + if (ret < 0) > + return dev_err_probe(&pdev->dev, ret, "mode switch failed\n"); amd_x3d_mode_switch() already prints an error when failing, so please just return the result directly: return amd_x3d_mode_switch(data, ret); Other than that the driver look good. Thanks, Armin Wolf > + > + return 0; > +} > + > +static struct platform_driver amd_3d_vcache_driver = { > + .driver = { > + .name = "amd_x3d_vcache", > + .dev_groups = amd_x3d_groups, > + .acpi_match_table = amd_x3d_acpi_ids, > + }, > + .probe = amd_x3d_probe, > +}; > +module_platform_driver(amd_3d_vcache_driver); > + > +MODULE_DESCRIPTION("AMD 3D V-Cache Performance Optimizer Driver"); > +MODULE_LICENSE("GPL");
Am 21.10.24 um 16:10 schrieb Armin Wolf: > Am 21.10.24 um 15:46 schrieb Basavaraj Natikar: > >> AMD X3D processors, also known as AMD 3D V-Cache, feature dual Core >> Complex Dies (CCDs) and enlarged L3 cache, enabling dynamic mode >> switching between Frequency and Cache modes. To optimize performance, >> implement the AMD 3D V-Cache Optimizer, which allows selecting either: >> >> Frequency mode: cores within the faster CCD are prioritized before >> those in the slower CCD. >> >> Cache mode: cores within the larger L3 CCD are prioritized before >> those in the smaller L3 CCD. >> >> Co-developed-by: Perry Yuan <perry.yuan@amd.com> >> Signed-off-by: Perry Yuan <perry.yuan@amd.com> >> Co-developed-by: Mario Limonciello <mario.limonciello@amd.com> >> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> >> Reviewed-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> >> Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com> >> --- >> MAINTAINERS | 7 ++ >> drivers/platform/x86/amd/Kconfig | 12 ++ >> drivers/platform/x86/amd/Makefile | 2 + >> drivers/platform/x86/amd/x3d_vcache.c | 160 ++++++++++++++++++++++++++ >> 4 files changed, 181 insertions(+) >> create mode 100644 drivers/platform/x86/amd/x3d_vcache.c >> >> diff --git a/MAINTAINERS b/MAINTAINERS >> index e9659a5a7fb3..11b829956499 100644 >> --- a/MAINTAINERS >> +++ b/MAINTAINERS >> @@ -965,6 +965,13 @@ Q: >> https://patchwork.kernel.org/project/linux-rdma/list/ >> F: drivers/infiniband/hw/efa/ >> F: include/uapi/rdma/efa-abi.h >> >> +AMD 3D V-CACHE PERFORMANCE OPTIMIZER DRIVER >> +M: Basavaraj Natikar <Basavaraj.Natikar@amd.com> >> +R: Mario Limonciello <mario.limonciello@amd.com> >> +L: platform-driver-x86@vger.kernel.org >> +S: Supported >> +F: drivers/platform/x86/amd/x3d_vcache.c >> + >> AMD ADDRESS TRANSLATION LIBRARY (ATL) >> M: Yazen Ghannam <Yazen.Ghannam@amd.com> >> L: linux-edac@vger.kernel.org >> diff --git a/drivers/platform/x86/amd/Kconfig >> b/drivers/platform/x86/amd/Kconfig >> index f88682d36447..d73f691020d0 100644 >> --- a/drivers/platform/x86/amd/Kconfig >> +++ b/drivers/platform/x86/amd/Kconfig >> @@ -6,6 +6,18 @@ >> source "drivers/platform/x86/amd/pmf/Kconfig" >> source "drivers/platform/x86/amd/pmc/Kconfig" >> >> +config AMD_3D_VCACHE >> + tristate "AMD 3D V-Cache Performance Optimizer Driver" >> + depends on X86_64 && ACPI >> + help >> + The driver provides a sysfs interface, enabling the setting of >> a bias >> + that alters CPU core reordering. This bias prefers cores with >> higher >> + frequencies or larger L3 caches on processors supporting AMD >> 3D V-Cache >> + technology. >> + >> + If you choose to compile this driver as a module the module >> will be >> + called amd_3d_vcache. >> + >> config AMD_HSMP >> tristate "AMD HSMP Driver" >> depends on AMD_NB && X86_64 && ACPI >> diff --git a/drivers/platform/x86/amd/Makefile >> b/drivers/platform/x86/amd/Makefile >> index dcec0a46f8af..16e4cce02242 100644 >> --- a/drivers/platform/x86/amd/Makefile >> +++ b/drivers/platform/x86/amd/Makefile >> @@ -4,6 +4,8 @@ >> # AMD x86 Platform-Specific Drivers >> # >> >> +obj-$(CONFIG_AMD_3D_VCACHE) += amd_3d_vcache.o >> +amd_3d_vcache-objs := x3d_vcache.o >> obj-$(CONFIG_AMD_PMC) += pmc/ >> amd_hsmp-y := hsmp.o >> obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o >> diff --git a/drivers/platform/x86/amd/x3d_vcache.c >> b/drivers/platform/x86/amd/x3d_vcache.c >> new file mode 100644 >> index 000000000000..ec861e7b5e1e >> --- /dev/null >> +++ b/drivers/platform/x86/amd/x3d_vcache.c >> @@ -0,0 +1,160 @@ >> +// SPDX-License-Identifier: GPL-2.0-or-later >> +/* >> + * AMD 3D V-Cache Performance Optimizer Driver >> + * >> + * Copyright (c) 2024, Advanced Micro Devices, Inc. >> + * All Rights Reserved. >> + * >> + * Authors: Basavaraj Natikar <Basavaraj.Natikar@amd.com> >> + * Perry Yuan <perry.yuan@amd.com> >> + * Mario Limonciello <mario.limonciello@amd.com> >> + * >> + */ >> + >> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt >> + >> +#include <linux/acpi.h> >> +#include <linux/device.h> >> +#include <linux/errno.h> >> +#include <linux/module.h> >> +#include <linux/mutex.h> >> +#include <linux/platform_device.h> >> + >> +static char *x3d_mode = "frequency"; >> +module_param(x3d_mode, charp, 0444); > > Hi, > > does userspace really need to know the value of this modparam? If no, > then please > change the visibility to 0. > >> +MODULE_PARM_DESC(x3d_mode, "Initial 3D-VCache mode; 'frequency' >> (default) or 'cache'"); >> + >> +#define DSM_REVISION_ID 0 >> +#define DSM_SET_X3D_MODE 1 >> + >> +static guid_t x3d_guid = GUID_INIT(0xdff8e55f, 0xbcfd, 0x46fb, 0xba, >> 0x0a, >> + 0xef, 0xd0, 0x45, 0x0f, 0x34, 0xee); >> + >> +enum amd_x3d_mode_type { >> + MODE_INDEX_FREQ, >> + MODE_INDEX_CACHE, >> +}; >> + >> +static const char * const amd_x3d_mode_strings[] = { >> + [MODE_INDEX_FREQ] = "frequency", >> + [MODE_INDEX_CACHE] = "cache", >> +}; >> + >> +struct amd_x3d_dev { >> + struct device *dev; >> + acpi_handle ahandle; >> + /* To protect x3d mode setting */ >> + struct mutex lock; >> + enum amd_x3d_mode_type curr_mode; >> +}; >> + >> +static int amd_x3d_mode_switch(struct amd_x3d_dev *data, int new_state) >> +{ >> + union acpi_object *out, argv; >> + >> + guard(mutex)(&data->lock); >> + argv.type = ACPI_TYPE_INTEGER; >> + argv.integer.value = new_state; >> + >> + out = acpi_evaluate_dsm(data->ahandle, &x3d_guid, >> DSM_REVISION_ID, DSM_SET_X3D_MODE, >> + &argv); >> + if (!out) { >> + dev_err(data->dev, "failed to evaluate _DSM\n"); >> + return -EINVAL; >> + } >> + >> + data->curr_mode = new_state; >> + >> + kfree(out); >> + >> + return 0; >> +} >> + >> +static ssize_t amd_x3d_mode_store(struct device *dev, struct >> device_attribute *attr, >> + const char *buf, size_t count) >> +{ >> + struct amd_x3d_dev *data = dev_get_drvdata(dev); >> + int ret; >> + >> + ret = sysfs_match_string(amd_x3d_mode_strings, buf); >> + if (ret < 0) { >> + dev_err(dev, "no matching mode to set %s\n", buf); > > Maybe just return ret here without printing anything. Otherwise > userspace could spam > the kernel log by continuously writing invalid strings. > >> + return ret; >> + } >> + >> + ret = amd_x3d_mode_switch(data, ret); >> + if (ret < 0) >> + return ret; >> + >> + return count; >> +} >> + >> +static ssize_t amd_x3d_mode_show(struct device *dev, struct >> device_attribute *attr, char *buf) >> +{ >> + struct amd_x3d_dev *data = dev_get_drvdata(dev); >> + >> + if (!(data->curr_mode == MODE_INDEX_CACHE || data->curr_mode == >> MODE_INDEX_FREQ)) >> + return -EINVAL; > > Can this error condition even be triggered? > >> + >> + return sysfs_emit(buf, "%s\n", >> amd_x3d_mode_strings[data->curr_mode]); > > Please use data->lock here to protect accesses to data->curr_mode. > >> +} >> +static DEVICE_ATTR_RW(amd_x3d_mode); >> + >> +static struct attribute *amd_x3d_attrs[] = { >> + &dev_attr_amd_x3d_mode.attr, >> + NULL >> +}; >> +ATTRIBUTE_GROUPS(amd_x3d); >> + >> +static const struct acpi_device_id amd_x3d_acpi_ids[] = { >> + {"AMDI0101"}, >> + { }, >> +}; >> +MODULE_DEVICE_TABLE(acpi, amd_x3d_acpi_ids); >> + >> +static int amd_x3d_probe(struct platform_device *pdev) >> +{ >> + struct amd_x3d_dev *data; >> + acpi_handle handle; >> + int ret; >> + >> + handle = ACPI_HANDLE(&pdev->dev); >> + if (!handle) >> + return -ENODEV; >> + >> + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); >> + if (!data) >> + return -ENOMEM; >> + >> + data->dev = &pdev->dev; >> + data->ahandle = handle; >> + platform_set_drvdata(pdev, data); >> + >> + if (!acpi_check_dsm(handle, &x3d_guid, DSM_REVISION_ID, >> BIT(DSM_SET_X3D_MODE))) >> + return dev_err_probe(&pdev->dev, -ENODEV, "not supported on >> this platform\n"); > > Please do this check before allocating anything, because the driver > should bail out as soon as possible > when encountering unsupported hardware. > > Also maybe being silent and just returning -ENODEV is better as this > error message serves no purpose. > >> + >> + ret = match_string(amd_x3d_mode_strings, >> ARRAY_SIZE(amd_x3d_mode_strings), x3d_mode); >> + if (ret < 0) >> + return dev_err_probe(&pdev->dev, -EINVAL, "invalid mode >> %s\n", x3d_mode); >> + >> + devm_mutex_init(data->dev, &data->lock); >> + >> + ret = amd_x3d_mode_switch(data, ret); >> + if (ret < 0) >> + return dev_err_probe(&pdev->dev, ret, "mode switch failed\n"); > > amd_x3d_mode_switch() already prints an error when failing, so please > just return the result directly: > > return amd_x3d_mode_switch(data, ret); > > Other than that the driver look good. > > Thanks, > Armin Wolf I think i missed something: Maybe the setting should be reapplied after suspend/resume? You certainly need to do this for S4 and maybe even for S3, depending whether or not this value is guaranteed to to remain stable during suspend. Thanks, Armin Wolf > >> + >> + return 0; >> +} >> + >> +static struct platform_driver amd_3d_vcache_driver = { >> + .driver = { >> + .name = "amd_x3d_vcache", >> + .dev_groups = amd_x3d_groups, >> + .acpi_match_table = amd_x3d_acpi_ids, >> + }, >> + .probe = amd_x3d_probe, >> +}; >> +module_platform_driver(amd_3d_vcache_driver); >> + >> +MODULE_DESCRIPTION("AMD 3D V-Cache Performance Optimizer Driver"); >> +MODULE_LICENSE("GPL"); >
diff --git a/MAINTAINERS b/MAINTAINERS index e9659a5a7fb3..11b829956499 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -965,6 +965,13 @@ Q: https://patchwork.kernel.org/project/linux-rdma/list/ F: drivers/infiniband/hw/efa/ F: include/uapi/rdma/efa-abi.h +AMD 3D V-CACHE PERFORMANCE OPTIMIZER DRIVER +M: Basavaraj Natikar <Basavaraj.Natikar@amd.com> +R: Mario Limonciello <mario.limonciello@amd.com> +L: platform-driver-x86@vger.kernel.org +S: Supported +F: drivers/platform/x86/amd/x3d_vcache.c + AMD ADDRESS TRANSLATION LIBRARY (ATL) M: Yazen Ghannam <Yazen.Ghannam@amd.com> L: linux-edac@vger.kernel.org diff --git a/drivers/platform/x86/amd/Kconfig b/drivers/platform/x86/amd/Kconfig index f88682d36447..d73f691020d0 100644 --- a/drivers/platform/x86/amd/Kconfig +++ b/drivers/platform/x86/amd/Kconfig @@ -6,6 +6,18 @@ source "drivers/platform/x86/amd/pmf/Kconfig" source "drivers/platform/x86/amd/pmc/Kconfig" +config AMD_3D_VCACHE + tristate "AMD 3D V-Cache Performance Optimizer Driver" + depends on X86_64 && ACPI + help + The driver provides a sysfs interface, enabling the setting of a bias + that alters CPU core reordering. This bias prefers cores with higher + frequencies or larger L3 caches on processors supporting AMD 3D V-Cache + technology. + + If you choose to compile this driver as a module the module will be + called amd_3d_vcache. + config AMD_HSMP tristate "AMD HSMP Driver" depends on AMD_NB && X86_64 && ACPI diff --git a/drivers/platform/x86/amd/Makefile b/drivers/platform/x86/amd/Makefile index dcec0a46f8af..16e4cce02242 100644 --- a/drivers/platform/x86/amd/Makefile +++ b/drivers/platform/x86/amd/Makefile @@ -4,6 +4,8 @@ # AMD x86 Platform-Specific Drivers # +obj-$(CONFIG_AMD_3D_VCACHE) += amd_3d_vcache.o +amd_3d_vcache-objs := x3d_vcache.o obj-$(CONFIG_AMD_PMC) += pmc/ amd_hsmp-y := hsmp.o obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o diff --git a/drivers/platform/x86/amd/x3d_vcache.c b/drivers/platform/x86/amd/x3d_vcache.c new file mode 100644 index 000000000000..ec861e7b5e1e --- /dev/null +++ b/drivers/platform/x86/amd/x3d_vcache.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * AMD 3D V-Cache Performance Optimizer Driver + * + * Copyright (c) 2024, Advanced Micro Devices, Inc. + * All Rights Reserved. + * + * Authors: Basavaraj Natikar <Basavaraj.Natikar@amd.com> + * Perry Yuan <perry.yuan@amd.com> + * Mario Limonciello <mario.limonciello@amd.com> + * + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/acpi.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> + +static char *x3d_mode = "frequency"; +module_param(x3d_mode, charp, 0444); +MODULE_PARM_DESC(x3d_mode, "Initial 3D-VCache mode; 'frequency' (default) or 'cache'"); + +#define DSM_REVISION_ID 0 +#define DSM_SET_X3D_MODE 1 + +static guid_t x3d_guid = GUID_INIT(0xdff8e55f, 0xbcfd, 0x46fb, 0xba, 0x0a, + 0xef, 0xd0, 0x45, 0x0f, 0x34, 0xee); + +enum amd_x3d_mode_type { + MODE_INDEX_FREQ, + MODE_INDEX_CACHE, +}; + +static const char * const amd_x3d_mode_strings[] = { + [MODE_INDEX_FREQ] = "frequency", + [MODE_INDEX_CACHE] = "cache", +}; + +struct amd_x3d_dev { + struct device *dev; + acpi_handle ahandle; + /* To protect x3d mode setting */ + struct mutex lock; + enum amd_x3d_mode_type curr_mode; +}; + +static int amd_x3d_mode_switch(struct amd_x3d_dev *data, int new_state) +{ + union acpi_object *out, argv; + + guard(mutex)(&data->lock); + argv.type = ACPI_TYPE_INTEGER; + argv.integer.value = new_state; + + out = acpi_evaluate_dsm(data->ahandle, &x3d_guid, DSM_REVISION_ID, DSM_SET_X3D_MODE, + &argv); + if (!out) { + dev_err(data->dev, "failed to evaluate _DSM\n"); + return -EINVAL; + } + + data->curr_mode = new_state; + + kfree(out); + + return 0; +} + +static ssize_t amd_x3d_mode_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct amd_x3d_dev *data = dev_get_drvdata(dev); + int ret; + + ret = sysfs_match_string(amd_x3d_mode_strings, buf); + if (ret < 0) { + dev_err(dev, "no matching mode to set %s\n", buf); + return ret; + } + + ret = amd_x3d_mode_switch(data, ret); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t amd_x3d_mode_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct amd_x3d_dev *data = dev_get_drvdata(dev); + + if (!(data->curr_mode == MODE_INDEX_CACHE || data->curr_mode == MODE_INDEX_FREQ)) + return -EINVAL; + + return sysfs_emit(buf, "%s\n", amd_x3d_mode_strings[data->curr_mode]); +} +static DEVICE_ATTR_RW(amd_x3d_mode); + +static struct attribute *amd_x3d_attrs[] = { + &dev_attr_amd_x3d_mode.attr, + NULL +}; +ATTRIBUTE_GROUPS(amd_x3d); + +static const struct acpi_device_id amd_x3d_acpi_ids[] = { + {"AMDI0101"}, + { }, +}; +MODULE_DEVICE_TABLE(acpi, amd_x3d_acpi_ids); + +static int amd_x3d_probe(struct platform_device *pdev) +{ + struct amd_x3d_dev *data; + acpi_handle handle; + int ret; + + handle = ACPI_HANDLE(&pdev->dev); + if (!handle) + return -ENODEV; + + data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->dev = &pdev->dev; + data->ahandle = handle; + platform_set_drvdata(pdev, data); + + if (!acpi_check_dsm(handle, &x3d_guid, DSM_REVISION_ID, BIT(DSM_SET_X3D_MODE))) + return dev_err_probe(&pdev->dev, -ENODEV, "not supported on this platform\n"); + + ret = match_string(amd_x3d_mode_strings, ARRAY_SIZE(amd_x3d_mode_strings), x3d_mode); + if (ret < 0) + return dev_err_probe(&pdev->dev, -EINVAL, "invalid mode %s\n", x3d_mode); + + devm_mutex_init(data->dev, &data->lock); + + ret = amd_x3d_mode_switch(data, ret); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "mode switch failed\n"); + + return 0; +} + +static struct platform_driver amd_3d_vcache_driver = { + .driver = { + .name = "amd_x3d_vcache", + .dev_groups = amd_x3d_groups, + .acpi_match_table = amd_x3d_acpi_ids, + }, + .probe = amd_x3d_probe, +}; +module_platform_driver(amd_3d_vcache_driver); + +MODULE_DESCRIPTION("AMD 3D V-Cache Performance Optimizer Driver"); +MODULE_LICENSE("GPL");