[igt-dev] [PATCH i-g-t v2 3/8] lib/igt_pm: D3Cold runtime pm infrastructure
Gupta, Anshuman
anshuman.gupta at intel.com
Mon May 2 11:33:07 UTC 2022
> -----Original Message-----
> From: Nilawar, Badal <badal.nilawar at intel.com>
> Sent: Saturday, April 30, 2022 12:43 AM
> To: Gupta, Anshuman <anshuman.gupta at intel.com>; igt-
> dev at lists.freedesktop.org
> Cc: kamil.konieczny at linux.intel.com; Vivi, Rodrigo <rodrigo.vivi at intel.com>;
> Latvala, Petri <petri.latvala at intel.com>; Ewins, Jon <jon.ewins at intel.com>
> Subject: Re: [PATCH i-g-t v2 3/8] lib/igt_pm: D3Cold runtime pm infrastructure
>
>
>
> On 29-04-2022 14:24, 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.
> >
> > v2:
> > - Save pci dev power attr to dynamically allocated array. [Rodrigo]
> > - Set autosuspend delay to 0 on supported devices. [Rodrigo]
> > - %s/else if/else in igt_pm_get_acpi_real_d_state. [Kamil]
> >
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> > ---
> > lib/igt_pm.c | 290
> +++++++++++++++++++++++++++++++++++++++++++++++++++
> > lib/igt_pm.h | 23 ++++
> > 2 files changed, 313 insertions(+)
> >
> > diff --git a/lib/igt_pm.c b/lib/igt_pm.c index b409ec463..20296c40b
> > 100644
> > --- a/lib/igt_pm.c
> > +++ b/lib/igt_pm.c
> > @@ -28,6 +28,7 @@
> > #include <fcntl.h>
> > #include <stdio.h>
> > #include <limits.h>
> > +#include <pciaccess.h>
> > #include <stdlib.h>
> > #include <string.h>
> > #include <unistd.h>
> > @@ -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 +858,291 @@ bool i915_output_is_lpsp_capable(int drm_fd,
> > igt_output_t *output)
> >
> > return strstr(buf, "LPSP: capable");
> > }
> > +
> > +/**
> > + * igt_pm_acpi_d3cold_supported:
> > + * @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_stat
> e",
> > + 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;
> > + if (strncmp(acpi_d_state, "D1\n", n_read) == 0)
> > + return IGT_ACPI_D1;
> > + if (strncmp(acpi_d_state, "D2\n", n_read) == 0)
> > + return IGT_ACPI_D2;
> > + if (strncmp(acpi_d_state, "D3hot\n", n_read) == 0)
> > + return IGT_ACPI_D3Hot;
> > + if (strncmp(acpi_d_state, "D3cold\n", n_read) == 0)
> > + return IGT_ACPI_D3Cold;
> > +
> > + return IGT_ACPI_UNKNOWN_STATE;
> > +}
> > +
> > +static struct igt_pm_pci_dev_pwrattr *__pci_dev_pwrattr; static int
> > +__igt_pm_pci_dev_cnt;
> > +
> > +static void __igt_pm_pci_card_exit_handler(int sig) {
> > + igt_pm_restore_pci_card_runtime_pm();
> > +}
> > +
> > +static int igt_pm_get_power_attr_fd(struct pci_device *pci_dev, const
> > +char *attr) {
> > + char name[PATH_MAX];
> > + int fd;
> > +
> > + snprintf(name, PATH_MAX,
> "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/power/%s",
> > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func,
> attr);
> > +
> > + fd = open(name, O_RDWR);
> > + igt_assert_f(fd >= 0, "Can't open %s\n", attr);
> > +
> > + return fd;
> > +}
> > +
> > +static bool igt_pm_save_power_attr(int fd, char *attr, int len, bool
> > +autosuspend) {
> > + int size;
> > +
> > + size = read(fd, attr, len - 1);
> > +
> > + if (autosuspend) {
> > + if (size < 0)
> > + return false;
> > + } else {
> > + igt_assert(size > 0);
> > + }
> > +
> > + attr[size] = '\0';
> > + strchomp(attr);
> > +
> > + return true;
> > +}
> > +
> > +static void igt_pm_setup_power_attr(int fd, const char *val) {
> > + int size, len;
> > + char buf[6];
> > +
> > + len = strlen(val);
> > +
> > + size = write(fd, val, len);
> > + igt_assert_eq(size, len);
> > + lseek(fd, 0, SEEK_SET);
> > + size = read(fd, buf, ARRAY_SIZE(buf));
> > + igt_assert_eq(size, len);
> > + igt_assert(strncmp(buf, val, len) == 0); }
> > +
> > +static void
> > +__igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev, int
> > +index) {
> > + int control_fd, delay_fd, control_size, delay_size;
> > + char *control, *delay;
> > +
> > + igt_assert(index < MAX_PCI_DEVICES) > +
> > + if (!(index % 16)) {
> > + __pci_dev_pwrattr =
> > + realloc(__pci_dev_pwrattr,
> > + sizeof(struct igt_pm_pci_dev_pwrattr) * (index
> / 16 + 1) * 16);
> > + }
> > +
> > + control = __pci_dev_pwrattr[index].control;
> > + control_size = sizeof(__pci_dev_pwrattr[index].control);
> > + delay = __pci_dev_pwrattr[index].autosuspend_delay;
> > + delay_size = sizeof(__pci_dev_pwrattr[index].autosuspend_delay);
> > + __pci_dev_pwrattr[index].pci_dev = pci_dev;
> > + __pci_dev_pwrattr[index].autosuspend_supported = true;
> > +
> > + delay_fd = igt_pm_get_power_attr_fd(pci_dev,
> "autosuspend_delay_ms");
> > + control_fd = igt_pm_get_power_attr_fd(pci_dev, "control");
> > +
> > + if (!igt_pm_save_power_attr(delay_fd, delay, delay_size, true)) {
> > + __pci_dev_pwrattr[index].autosuspend_supported = false;
> > + igt_debug("PCI '%04x:%02x:%02x.%01x' doesn't support
> auto_suspend\n",
> > + pci_dev->domain, pci_dev->bus, pci_dev->dev,
> pci_dev->func);
> > + }
> > +
> > + igt_pm_save_power_attr(control_fd, control, control_size, false);
> > + igt_debug("PCI '%04x:%02x:%02x.%01x' Saved 'control,
> autosuspend_delay_ms' as '%s, %s'\n",
> > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func,
> control,
> > + __pci_dev_pwrattr[index].autosuspend_supported ? delay :
> "NA");
> > +
> > + if (!index)
> > + igt_install_exit_handler(__igt_pm_pci_card_exit_handler);
> > +
> > + if (__pci_dev_pwrattr[index].autosuspend_supported)
> > + igt_pm_setup_power_attr(delay_fd, "0\n");
> > +
> > + igt_pm_setup_power_attr(control_fd, "auto\n");
> > +
> > + close(delay_fd);
> > + close(control_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 by
> > + * enabling runtime suspend and setting autosuspend_delay_ms to zero.
> > + * It also saves power control attribute for all PCI endpoints
> > + * devices under 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;
> i should be initialized to 0;
Thanks for catching this, I missed it while rebasing it. It was initialized in v1 patch.
> > +
> > + 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++);
> > + }Searching of pci_device would be little faster if we use itr->mode
> > +=
> match_slot and pass iter->match.slot.bus to pci_device_next()
Iter members are not accessible outside libpciaccess.
So we do need to create iter each time , when do we want to increment the secondary bus.
Creating iter every time will not search faster.
Thanks,
Anshuman Gupta.
>
> Thanks,
> Badal Nilawar
> > +
> > + __igt_pm_pci_dev_cnt = i;
> > +}
> > +
> > +static void
> > +igt_pm_restore_power_attr(struct pci_device *pci_dev, const char
> > +*attr, char *val, int len) {
> > + int fd;
> > +
> > + igt_debug("PCI '%04x:%02x:%02x.%01x' Restoring %s attr to '%s'\n",
> > + pci_dev->domain, pci_dev->bus, pci_dev->dev, pci_dev->func,
> attr,
> > +val);
> > +
> > + fd = igt_pm_get_power_attr_fd(pci_dev, attr);
> > + igt_assert(write(fd, val, len) == len);
> > +
> > + close(fd);
> > +}
> > +
> > +/**
> > + * igt_pm_restore_pci_card_runtime_pm:
> > + * Restore control and autosuspend_delay_ms power attribute for all
> > + * PCI endpoints devices under gfx root port, which were saved
> > +earlier
> > + * by igt_pm_setup_pci_card_runtime_pm().
> > + */
> > +void igt_pm_restore_pci_card_runtime_pm(void)
> > +{
> > + int i = 0;
> > +
> > + if (!__pci_dev_pwrattr)
> > + return;
> > +
> > + for (i = 0; i < __igt_pm_pci_dev_cnt; i++) {
> > + igt_pm_restore_power_attr(__pci_dev_pwrattr[i].pci_dev,
> "control",
> > + __pci_dev_pwrattr[i].control,
> > + sizeof(__pci_dev_pwrattr[i].control));
> > +
> > + if (!__pci_dev_pwrattr[i].autosuspend_supported)
> > + continue;
> > +
> > + igt_pm_restore_power_attr(__pci_dev_pwrattr[i].pci_dev,
> "autosuspend_delay_ms",
> > +
> __pci_dev_pwrattr[i].autosuspend_delay,
> > +
> sizeof(__pci_dev_pwrattr[i].autosuspend_delay));
> > + }
> > +
> > + pci_system_cleanup();
> > + free(__pci_dev_pwrattr);
> > + __pci_dev_pwrattr = NULL;
> > +}
> > +
> > +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;
> > +
> > + if (!__pci_dev_pwrattr)
> > + return;
> > +
> > + for (i = 0; i < __igt_pm_pci_dev_cnt; i++)
> > +
> igt_pm_print_pci_dev_runtime_status(__pci_dev_pwrattr[i].pci_dev);
> > +}
> > diff --git a/lib/igt_pm.h b/lib/igt_pm.h index 162d3ca3c..898178670
> > 100644
> > --- a/lib/igt_pm.h
> > +++ b/lib/igt_pm.h
> > @@ -46,6 +46,23 @@ 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_pwrattr {
> > + struct pci_device *pci_dev;
> > + char control[64];
> > + bool autosuspend_supported;
> > + char autosuspend_delay[64];
> > +};
> > +
> > bool igt_setup_runtime_pm(int device);
> > void igt_disable_runtime_pm(void);
> > void igt_restore_runtime_pm(void);
> > @@ -54,5 +71,11 @@ 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 */
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