From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7CDCA10FF2B for ; Mon, 2 May 2022 05:51:28 +0000 (UTC) From: "Gupta, Anshuman" To: "Vivi, Rodrigo" Date: Mon, 2 May 2022 05:51:26 +0000 Message-ID: References: <20220429085425.24568-1-anshuman.gupta@intel.com> <20220429085425.24568-4-anshuman.gupta@intel.com> In-Reply-To: Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [igt-dev] [PATCH i-g-t v2 3/8] lib/igt_pm: D3Cold runtime pm infrastructure List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "igt-dev@lists.freedesktop.org" , "Latvala, Petri" , "Nilawar, Badal" Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" List-ID: > -----Original Message----- > From: Vivi, Rodrigo > Sent: Friday, April 29, 2022 8:18 PM > To: Gupta, Anshuman > Cc: igt-dev@lists.freedesktop.org; kamil.konieczny@linux.intel.com; Latva= la, > Petri ; Nilawar, Badal = ; > Ewins, Jon > Subject: Re: [PATCH i-g-t v2 3/8] lib/igt_pm: D3Cold runtime pm infrastru= cture >=20 > On Fri, Apr 29, 2022 at 02:24:20PM +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. > > > > 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 > > Signed-off-by: Anshuman Gupta > > --- > > 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 > > #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 +858,291 @@ 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 =3D open(name, O_RDONLY); > > + igt_require(dir > 0); > > + > > + /* BIOS need to enable ACPI D3Cold Support.*/ > > + fd =3D openat(dir, "real_power_state", O_RDONLY); > > + if (fd < 0 && errno =3D=3D 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 =3D open(name, O_RDONLY); > > + if (fd < 0) > > + return IGT_ACPI_UNKNOWN_STATE; > > + > > + n_read =3D read(fd, acpi_d_state, sizeof(acpi_d_state) - 1); > > + igt_assert(n_read >=3D 0); > > + acpi_d_state[n_read] =3D '\0'; > > + close(fd); > > + > > + if (strncmp(acpi_d_state, "D0\n", n_read) =3D=3D 0) > > + return IGT_ACPI_D0; > > + if (strncmp(acpi_d_state, "D1\n", n_read) =3D=3D 0) > > + return IGT_ACPI_D1; > > + if (strncmp(acpi_d_state, "D2\n", n_read) =3D=3D 0) > > + return IGT_ACPI_D2; > > + if (strncmp(acpi_d_state, "D3hot\n", n_read) =3D=3D 0) > > + return IGT_ACPI_D3Hot; > > + if (strncmp(acpi_d_state, "D3cold\n", n_read) =3D=3D 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; >=20 > looking at this now I believe I prefer the static global one than this re= allocated > one. >=20 > I saw that we have other examples in igt lib that follows same patter so = that > should be okay. Reallocated buffer approach also referred from __igt_pm_enable_sata_link_po= wer_management() Igt_pm.c. IMHO this will be good as compare to global buffer, unless i mis= sed any issues around it ?=20 >=20 > But honestly what I don't like is the global at all. > I see that you have the exit handler below that takes care of the unset, = but I > believe as a "lib" this should be independent for symmetric reasons. >=20 > what I had in mind was something to be called at setup fixture and clean = up > fixture. you save locally your pci config and then you clean that up on r= estore... AFAIK igt_fixture() approach to restore the power attribute state may not w= ork in certain cases when task is getting killed due to some raised signal. That is where igt exit handler ha= ve importance. If we would have a void *data argument to pass in igt exit handler , then = we could get rid of global. Thanks, Anshuman Gupta. >=20 > But now seeing other global cases in the core of igt lib I don't care muc= h > anymore... >=20 > But probably cleaner with the static now... and sorry about the back and = forth > on this... >=20 > > + > > +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 =3D open(name, O_RDWR); > > + igt_assert_f(fd >=3D 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 =3D read(fd, attr, len - 1); > > + > > + if (autosuspend) { > > + if (size < 0) > > + return false; > > + } else { > > + igt_assert(size > 0); > > + } > > + > > + attr[size] =3D '\0'; > > + strchomp(attr); > > + > > + return true; > > +} > > + > > +static void igt_pm_setup_power_attr(int fd, const char *val) { > > + int size, len; > > + char buf[6]; > > + > > + len =3D strlen(val); > > + > > + size =3D write(fd, val, len); > > + igt_assert_eq(size, len); > > + lseek(fd, 0, SEEK_SET); > > + size =3D read(fd, buf, ARRAY_SIZE(buf)); > > + igt_assert_eq(size, len); > > + igt_assert(strncmp(buf, val, len) =3D=3D 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 =3D > > + realloc(__pci_dev_pwrattr, > > + sizeof(struct igt_pm_pci_dev_pwrattr) * (index > / 16 + 1) * 16); > > + } > > + > > + control =3D __pci_dev_pwrattr[index].control; > > + control_size =3D sizeof(__pci_dev_pwrattr[index].control); > > + delay =3D __pci_dev_pwrattr[index].autosuspend_delay; > > + delay_size =3D sizeof(__pci_dev_pwrattr[index].autosuspend_delay); > > + __pci_dev_pwrattr[index].pci_dev =3D pci_dev; > > + __pci_dev_pwrattr[index].autosuspend_supported =3D true; > > + > > + delay_fd =3D igt_pm_get_power_attr_fd(pci_dev, > "autosuspend_delay_ms"); > > + control_fd =3D 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 =3D 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; > > + > > + ret =3D pci_device_get_bridge_buses(pci_dev, &primary, &secondary, > &subordinate); > > + igt_assert(!ret); > > + > > + ret =3D pci_system_init(); > > + igt_assert(!ret); > > + > > + iter =3D 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 =3D pci_device_next(iter)) !=3D NULL) { > > + if (dev->bus >=3D secondary && dev->bus <=3D subordinate) > > + __igt_pm_setup_pci_card_runtime_pm(dev, i++); > > + } > > + > > + __igt_pm_pci_dev_cnt =3D 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 =3D igt_pm_get_power_attr_fd(pci_dev, attr); > > + igt_assert(write(fd, val, len) =3D=3D 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 =3D 0; > > + > > + if (!__pci_dev_pwrattr) > > + return; > > + > > + for (i =3D 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 =3D 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 =3D open(name, O_RDONLY); > > + igt_assert_f(fd >=3D 0, "Can't open runtime_status\n"); > > + > > + n_read =3D read(fd, runtime_status, sizeof(runtime_status) - 1); > > + igt_assert(n_read >=3D 0); > > + runtime_status[n_read] =3D '\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 =3D 0; > > + > > + if (!__pci_dev_pwrattr) > > + return; > > + > > + for (i =3D 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 */ > > -- > > 2.26.2 > >