[igt-dev] [PATCH i-g-t v4 3/9] lib/igt_pm: D3Cold runtime pm infrastructure
Anshuman Gupta
anshuman.gupta at intel.com
Thu May 5 11:03:48 UTC 2022
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]
v3:
- Add comment for MAX_PCI_DEVICES. [Badal]
- Use static global arrary __pci_dev_pwrattr[]. [Rodrigo]
- Use pci_slot_match iter. [Badal]
- Destroy the iter. [Badal]
v4:
- Added igt_pm_enbale_pci_card_autosuspend() to avoid any
control attr save/resore by exit handler. [Rodrigo]
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
lib/igt_pm.c | 341 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_pm.h | 24 ++++
2 files changed, 365 insertions(+)
diff --git a/lib/igt_pm.c b/lib/igt_pm.c
index b409ec463..8e5aa9208 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 +76,8 @@ enum {
#define MIN_POWER_STR "min_power\n"
/* Remember to fix this if adding longer strings */
#define MAX_POLICY_STRLEN strlen(MAX_PERFORMANCE_STR)
+/* Root Port bus can have max 32 dev and each dev can have max 8 func */
+#define MAX_PCI_DEVICES 256
int8_t *__sata_pm_policies;
int __scsi_host_cnt;
@@ -856,3 +859,341 @@ 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_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;
+ 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[MAX_PCI_DEVICES];
+
+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);
+
+ 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);
+}
+
+static struct
+pci_device_iterator *igt_pm_get_pci_dev_itr(struct pci_device *pci_dev)
+{
+ struct pci_device_iterator *iter;
+ struct pci_slot_match match;
+ int ret;
+
+ ret = pci_system_init();
+ igt_assert(!ret);
+
+ match.domain = pci_dev->domain;
+ match.bus = PCI_MATCH_ANY;
+ match.dev = PCI_MATCH_ANY;
+ match.func = PCI_MATCH_ANY;
+ iter = pci_slot_match_iterator_create(&match);
+
+ return iter;
+}
+
+/**
+ * igt_pm_enbale_pci_card_autosuspend:
+ * @pci_dev: root port pci_dev.
+ * Setup runtime PM for all PCI endpoints devices for a given root port by
+ * setting power/control attr to "auto".
+ *
+ * Returns:
+ * Zero if success else returns error.
+ */
+int igt_pm_enbale_pci_card_autosuspend(struct pci_device *pci_dev)
+{
+ int primary, secondary, subordinate, ret, control_fd;
+ struct pci_device_iterator *iter;
+ struct pci_device *dev;
+
+ ret = pci_device_get_bridge_buses(pci_dev, &primary, &secondary, &subordinate);
+ if (ret)
+ return ret;
+
+ iter = igt_pm_get_pci_dev_itr(pci_dev);
+ if (!iter)
+ return -ENODEV;
+
+ control_fd = igt_pm_get_power_attr_fd(pci_dev, "control");
+ igt_pm_setup_power_attr(control_fd, "auto\n");
+ while ((dev = pci_device_next(iter)) != NULL) {
+ if (dev->bus >= secondary && dev->bus <= subordinate) {
+ control_fd = igt_pm_get_power_attr_fd(dev, "control");
+ igt_pm_setup_power_attr(control_fd, "auto\n");
+ }
+ }
+
+ pci_iterator_destroy(iter);
+ pci_system_cleanup();
+
+ return 0;
+}
+
+/**
+ * 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 = 0;
+
+ memset(__pci_dev_pwrattr, 0, sizeof(__pci_dev_pwrattr));
+ ret = pci_device_get_bridge_buses(pci_dev, &primary, &secondary, &subordinate);
+ igt_assert(!ret);
+
+ /* Setup runtime pm for PCI root port */
+ __igt_pm_setup_pci_card_runtime_pm(pci_dev, i++);
+
+ iter = igt_pm_get_pci_dev_itr(pci_dev);
+ igt_assert(iter);
+ while ((dev = pci_device_next(iter)) != NULL) {
+ if (dev->bus >= secondary && dev->bus <= subordinate)
+ __igt_pm_setup_pci_card_runtime_pm(dev, i++);
+ }
+
+ pci_iterator_destroy(iter);
+}
+
+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;
+
+ for (i = 0; i < MAX_PCI_DEVICES; i++) {
+ if (!__pci_dev_pwrattr[i].pci_dev)
+ break;
+
+ 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));
+ }
+
+ memset(__pci_dev_pwrattr, 0, sizeof(__pci_dev_pwrattr));
+ 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 (!__pci_dev_pwrattr[i].pci_dev)
+ break;
+
+ 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..db187cc2e 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 +71,12 @@ 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);
+int igt_pm_enbale_pci_card_autosuspend(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
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