From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6533810E0D1 for ; Fri, 22 Apr 2022 10:17:05 +0000 (UTC) Date: Fri, 22 Apr 2022 06:16:58 -0400 From: Rodrigo Vivi To: Anshuman Gupta Message-ID: References: <20220418125048.7969-1-anshuman.gupta@intel.com> <20220418125048.7969-4-anshuman.gupta@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220418125048.7969-4-anshuman.gupta@intel.com> Subject: Re: [igt-dev] [PATCH i-g-t 3/9] lib/igt_pm: D3Cold runtime pm infrastructure List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: igt-dev@lists.freedesktop.org, badal.nilawar@intel.com Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" List-ID: On Mon, Apr 18, 2022 at 06:20:42PM +0530, Anshuman Gupta wrote: > Enable gfx card pci devices runtime pm for all pci devices > and bridge under the topology of Gfx Card root port. > > Added a library function to get the PCI root port ACPI > D state and to print the pci card devices runtime pm > status. > > Cc: Rodrigo Vivi > Signed-off-by: Anshuman Gupta > --- > lib/igt_pm.c | 226 +++++++++++++++++++++++++++++++++++++++++++++++++++ > lib/igt_pm.h | 21 +++++ > 2 files changed, 247 insertions(+) > > diff --git a/lib/igt_pm.c b/lib/igt_pm.c > index b409ec463..8e8a330f8 100644 > --- a/lib/igt_pm.c > +++ b/lib/igt_pm.c > @@ -28,6 +28,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -75,6 +76,7 @@ enum { > #define MIN_POWER_STR "min_power\n" > /* Remember to fix this if adding longer strings */ > #define MAX_POLICY_STRLEN strlen(MAX_PERFORMANCE_STR) > +#define MAX_PCI_DEVICES 256 > int8_t *__sata_pm_policies; > int __scsi_host_cnt; > > @@ -856,3 +858,227 @@ bool i915_output_is_lpsp_capable(int drm_fd, igt_output_t *output) > > return strstr(buf, "LPSP: capable"); > } > + > +/** > + * igt_pm_acpi_d3cold_suppoarted: ^ typo > + * @pci_dev: root port pci_dev. > + * Check ACPI D3Cold support. > + * > + * Returns: > + * True if ACPI D3Cold supported otherwise false. > + */ > +bool igt_pm_acpi_d3cold_supported(struct pci_device *pci_dev) > +{ > + char name[PATH_MAX]; > + int dir, fd; > + > + snprintf(name, PATH_MAX, > + "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/firmware_node", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func); > + > + dir = open(name, O_RDONLY); > + igt_require(dir > 0); > + > + /* BIOS need to enable ACPI D3Cold Support.*/ > + fd = openat(dir, "real_power_state", O_RDONLY); > + if (fd < 0 && errno == ENOENT) > + return false; > + > + igt_require(fd > 0); > + > + return true; > +} > + > +/** > + * igt_pm_get_acpi_real_d_state: > + * @pci_dev: root port pci_dev. > + * Get ACPI D state for a given root port. > + * > + * Returns: > + * igt_acpi_d_state state. > + */ > +enum igt_acpi_d_state > +igt_pm_get_acpi_real_d_state(struct pci_device *pci_dev) > +{ > + char name[PATH_MAX]; > + char acpi_d_state[64]; > + int fd, n_read; > + > + snprintf(name, PATH_MAX, > + "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/firmware_node/real_power_state", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func); > + > + fd = open(name, O_RDONLY); > + if (fd < 0) > + return IGT_ACPI_UNKNOWN_STATE; > + > + n_read = read(fd, acpi_d_state, sizeof(acpi_d_state) - 1); > + igt_assert(n_read >= 0); > + acpi_d_state[n_read] = '\0'; > + close(fd); > + > + if (strncmp(acpi_d_state, "D0\n", n_read) == 0) > + return IGT_ACPI_D0; > + else if (strncmp(acpi_d_state, "D1\n", n_read) == 0) > + return IGT_ACPI_D1; > + else if (strncmp(acpi_d_state, "D2\n", n_read) == 0) > + return IGT_ACPI_D2; > + else if (strncmp(acpi_d_state, "D3hot\n", n_read) == 0) > + return IGT_ACPI_D3Hot; > + else if (strncmp(acpi_d_state, "D3cold\n", n_read) == 0) > + return IGT_ACPI_D3Cold; > + else > + return IGT_ACPI_UNKNOWN_STATE; > +} > + > +static struct igt_pm_pci_dev_control __igt_pm_pci_control[MAX_PCI_DEVICES]; the only thing that I'm not totally comfortable with this patch is this global struct of 256 items in a lib file. Although I liked the use of the exit handler to restore the status... > + > +static void __igt_pm_pci_card_exit_handler(int sig) > +{ > + igt_pm_restore_pci_card_runtime_pm(); > +} > + > +static void > +__igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev, int index) > +{ > + char name[PATH_MAX], buf[6]; > + int fd, control_size, size; > + char *control; > + > + igt_assert(index < MAX_PCI_DEVICES); > + > + control = __igt_pm_pci_control[index].control; > + control_size = sizeof(__igt_pm_pci_control[index].control); > + __igt_pm_pci_control[index].pci_dev = pci_dev; > + > + snprintf(name, PATH_MAX, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/power/control", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func); > + > + fd = open(name, O_RDWR); > + igt_assert_f(fd >= 0, "Can't open control\n"); > + > + igt_assert(read(fd, control, control_size - 1) > 0); > + strchomp(control); > + > + igt_debug("Saved runtime power management for PCI '%04x:%02x:%02x.%01x' '%s'\n", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func, control); > + igt_install_exit_handler(__igt_pm_pci_card_exit_handler); > + > + size = write(fd, "auto\n", 5); > + igt_assert(size == 5); > + > + lseek(fd, 0, SEEK_SET); > + size = read(fd, buf, ARRAY_SIZE(buf)); > + igt_assert(size == 5); > + igt_assert(strncmp(buf, "auto\n", 5) == 0); > + > + close(fd); > +} > + > +/** > + * igt_pm_setup_pci_card_runtime_pm: > + * @pci_dev: root port pci_dev. > + * Setup runtime PM for all PCI endpoints devices for a given > + * root port. It also save power control attribute for all PCI endpoints > + * devices for a given root port. > + */ > +void igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev) > +{ > + int primary, secondary, subordinate, ret; > + struct pci_device_iterator *iter; > + struct pci_device *dev; > + int i = 0; > + > + memset(__igt_pm_pci_control, 0, sizeof(__igt_pm_pci_control)); > + ret = pci_device_get_bridge_buses(pci_dev, &primary, &secondary, &subordinate); > + igt_assert(!ret); > + > + ret = pci_system_init(); > + igt_assert(!ret); > + > + iter = pci_slot_match_iterator_create(NULL); > + /* Setup runtime pm for PCI root port */ > + __igt_pm_setup_pci_card_runtime_pm(pci_dev, i++); > + while ((dev = pci_device_next(iter)) != NULL) { > + if (dev->bus >= secondary && dev->bus <= subordinate) > + __igt_pm_setup_pci_card_runtime_pm(dev, i++); > + } > +} > + > +static void igt_pm_restore_pci_dev_runtime_pm(struct pci_device *pci_dev, char *control, int len) > +{ > + char name[PATH_MAX]; > + int fd; > + > + igt_debug("Restoring runtime power management for PCI '%04x:%02x:%02x.%01x' '%s'\n", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func, control); > + > + snprintf(name, PATH_MAX, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/power/control", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func); > + > + fd = open(name, O_WRONLY); > + igt_assert_f(fd >= 0, "Can't open control\n"); > + > + igt_assert(write(fd, control, len) == len); > + close(fd); > +} > + > +/** > + * igt_pm_restore_pci_card_runtime_pm: > + * @pci_dev: root port pci_dev. > + * Restore power control attribute for all PCI endpoints devices for a given > + * root port. > + */ > +void igt_pm_restore_pci_card_runtime_pm(void) > +{ > + int i = 0; > + > + for (i = 0; i < MAX_PCI_DEVICES; i++) { > + if (!__igt_pm_pci_control[i].pci_dev) > + break; > + > + igt_pm_restore_pci_dev_runtime_pm(__igt_pm_pci_control[i].pci_dev, > + __igt_pm_pci_control[i].control, > + sizeof(__igt_pm_pci_control[i].control)); > + } > + > + memset(__igt_pm_pci_control, 0, sizeof(__igt_pm_pci_control)); > + pci_system_cleanup(); > +} > + > +static void igt_pm_print_pci_dev_runtime_status(struct pci_device *pci_dev) > +{ > + char name[PATH_MAX], runtime_status[64]; > + int fd, n_read; > + > + snprintf(name, PATH_MAX, "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/power/runtime_status", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func); > + > + fd = open(name, O_RDONLY); > + igt_assert_f(fd >= 0, "Can't open runtime_status\n"); > + > + n_read = read(fd, runtime_status, sizeof(runtime_status) - 1); > + igt_assert(n_read >= 0); > + runtime_status[n_read] = '\0'; > + igt_info("runtime suspend status for PCI '%04x:%02x:%02x.%01x' %s\n", > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func, runtime_status); > + close(fd); > +} > + > +/** > + * igt_pm_print_pci_card_runtime_status: > + * @pci_dev: root port pci_dev. > + * Print runtime suspend status for all PCI endpoints devices for a given > + * root port. > + */ > +void igt_pm_print_pci_card_runtime_status(void) > +{ > + int i = 0; > + > + for (i = 0; i < MAX_PCI_DEVICES; i++) { > + if (!__igt_pm_pci_control[i].pci_dev) > + break; > + > + igt_pm_print_pci_dev_runtime_status(__igt_pm_pci_control[i].pci_dev); > + } > +} > diff --git a/lib/igt_pm.h b/lib/igt_pm.h > index 162d3ca3c..a5a9c4760 100644 > --- a/lib/igt_pm.h > +++ b/lib/igt_pm.h > @@ -46,6 +46,21 @@ enum igt_runtime_pm_status { > IGT_RUNTIME_PM_STATUS_UNKNOWN, > }; > > +/* PCI ACPI firmware node real state */ > +enum igt_acpi_d_state { > + IGT_ACPI_D0, > + IGT_ACPI_D1, > + IGT_ACPI_D2, > + IGT_ACPI_D3Hot, > + IGT_ACPI_D3Cold, > + IGT_ACPI_UNKNOWN_STATE, > +}; > + > +struct igt_pm_pci_dev_control { > + struct pci_device *pci_dev; > + char control[64]; > +}; > + > bool igt_setup_runtime_pm(int device); > void igt_disable_runtime_pm(void); > void igt_restore_runtime_pm(void); > @@ -54,5 +69,11 @@ bool igt_wait_for_pm_status(enum igt_runtime_pm_status status); > bool igt_pm_dmc_loaded(int debugfs); > bool igt_pm_pc8_plus_residencies_enabled(int msr_fd); > bool i915_output_is_lpsp_capable(int drm_fd, igt_output_t *output); > +bool igt_pm_acpi_d3cold_supported(struct pci_device *pci_dev); > +enum igt_acpi_d_state > +igt_pm_get_acpi_real_d_state(struct pci_device *pci_dev); > +void igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev); > +void igt_pm_restore_pci_card_runtime_pm(void); > +void igt_pm_print_pci_card_runtime_status(void); > > #endif /* IGT_PM_H */ > -- > 2.26.2 >