Date:   Tue, 12 Oct 2021 18:36:16 +0000
From:   "Reshetova, Elena" <elena.reshetova@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
CC:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Richard Henderson <rth@...ddle.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        James E J Bottomley <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>,
        "Jonathan Corbet" <corbet@....net>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "David Hildenbrand" <david@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        Peter H Anvin <hpa@...or.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Kirill Shutemov" <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        X86 ML <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        "linux-alpha@...r.kernel.org" <linux-alpha@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "Linux Doc Mailing List" <linux-doc@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
Subject: RE: [PATCH v5 12/16] PCI: Add pci_iomap_host_shared(),
 pci_iomap_host_shared_range()

> The 5.15 tree has something like ~2.4k IO accesses (including MMIO and
> others) in init functions that also register drivers (thanks Elena for
> the number)

To provide more numbers on this. What I can see so far from a smatch-based
analysis, we have 409 __init style functions (.probe & builtin/module_
_platform_driver_probe excluded) for 5.15 with allyesconfig. The number of
distinct individual IO reads (MSRs included) is much higher than 2.4k and on the
range of 30k because quite often there are more than a single IO read in the
same source function. The full list of accesses and the possible call paths is huge
for manually looking at, but here is the list of the 409 functions if anyone wants
to take a look:

['doc200x_ident_chip',
'doc_probe', 'doc2001_init', 'mtd_speedtest_init',
'mtd_nandbiterrs_init', 'mtd_oobtest_init', 'mtd_pagetest_init',
'tort_init', 'mtd_subpagetest_init', 'fixup_pmc551',
'doc_set_driver_info', 'init_amd76xrom', 'init_l440gx',
'init_sc520cdp', 'init_ichxrom', 'init_ck804xrom', 'init_esb2rom',
'probe_acpi_namespace_devices', 'amd_iommu_init_pci', 'state_next',
'arm_v7s_do_selftests', 'arm_lpae_run_tests', 'init_iommu_one',
'init_dmars', 'iommu_init_pci', 'early_amd_iommu_init',
'late_iommu_features_init', 'detect_ivrs',
'intel_prepare_irq_remapping', 'intel_enable_irq_remapping',
'intel_cleanup_irq_remapping', 'detect_intel_iommu',
'parse_ioapics_under_ir', 'si_domain_init', 'ubi_init',
'fb_console_init', 'xenbus_probe_backend_init',
'xenbus_probe_frontend_init', 'setup_vcpu_hotplug_event',
'balloon_init', 'intel_iommu_init', 'intel_rng_mod_init',
'check_tylersburg_isoch', 'dmar_table_init',
'enable_drhd_fault_handling', 'init_acpi_pm_clocksource',
'ostm_init_clksrc', 'ftm_clockevent_init', 'ftm_clocksource_init',
'kona_timer_init', 'mtk_gpt_init', 'samsung_clockevent_init',
'samsung_clocksource_init', 'sysctr_timer_init', 'mxs_timer_init',
'sun4i_timer_init', 'at91sam926x_pit_dt_init', 'owl_timer_init',
'sun5i_setup_clockevent', 'ubi_gluebi_init', 'ubiblock_init',
'hv_init_tsc_clocksource', 'hv_init_clocksource', 'mt7621_clk_init',
'samsung_clk_register_mux', 'samsung_clk_register_gate',
'samsung_clk_register_fixed_rate', 'clk_boston_setup',
'gemini_cc_init', 'aspeed_ast2400_cc', 'aspeed_ast2500_cc',
'sun6i_rtc_clk_init', 'phy_init', 'ingenic_ost_register_clock',
'meson6_timer_init', 'atcpit100_timer_init',
'npcm7xx_clocksource_init', 'clksrc_dbx500_prcmu_init', 'skx_init',
'i10nm_init', 'sbridge_init', 'i82975x_init', 'i3000_init',
'x38_init', 'ie31200_init', 'i3200_init', 'amd64_edac_init',
'pnd2_init', 'edac_init', 'adummy_init', 'mtd_stresstest_init',
'bxt_idle_state_table_update', 'sklh_idle_state_table_update',
'skx_idle_state_table_update',
'acpi_gpio_handle_deferred_request_irqs', 'smc_findirq', 'ltpc_probe',
'com90io_probe', 'com90xx_probe', 'pcnet32_init_module',
'it87_gpio_init', 'f7188x_find', 'it8712f_wdt_find', 'f71808e_find',
'it87_wdt_init', 'f71882fg_find', 'it87_find', 'f71805f_find',
'parport_pc_init', 'asic3_irq_probe', 'sch311x_detect',
'amd_gpio_init', 'dvb_init', 'dvb_register', 'em28xx_alsa_register',
'em28xx_dvb_register', 'em28xx_rc_register', 'em28xx_video_register',
'blackbird_init', 'bttv_check_chipset', 'ivtvfb_callback_init',
'init_control', 'con_init', 'cr_pll_init',
'clk_disable_unused_subtree', 'fmi_init', 'cadet_init', 'pcm20_init',
'airo_init_module', 'bnx2i_mod_init', 'bnx2fc_mod_init',
'timer_of_irq_exit', 'init', 'kempld_init', 'ivtvfb_init',
'brcmf_core_init', 'comedi_test_init', 'tlan_eisa_probe',
'timer_probe', 'of_clk_init', '__reserved_mem_init_node',
'of_irq_init', 'mace_init', 'vortex_eisa_init', 'reset_chip',
'atp_init', 'atp_probe1', 'smc_probe', 'osi_setup', 'led_init',
'el3_init_module', 'clk_sp810_of_setup', 'ltpc_probe_dma',
'com90io_found', 'check_mirror', 'arcrimi_found', 'com90xx_found',
'intel_soc_thermal_init', 'thermal_register_governors',
'thermal_unregister_governors', 'therm_lvt_init', 'tcc_cooling_init',
'powerclamp_probe', 'intel_init', 'qcom_geni_serial_earlycon_setup',
'kgdboc_early_init', 'lpuart_console_setup', 'speakup_init',
'early_console_setup', 'init_port', 'early_serial8250_setup',
'linflex_console_setup', 'pl010_console_setup', 'register_earlycon',
'of_setup_earlycon', 'slgt_init', 'moxa_init',
'parport_pc_init_superio', 'parport_pc_find_ports', 'mousedev_init',
'ses_init', 'riocm_init', 'efi_rci2_sysfs_init', 'blogic_probe',
'blogic_init', 'blogic_init_mm_probeinfo',
'blogic_init_probeinfo_list', 'blogic_checkadapter',
'blogic_rdconfig', 'blogic_inquiry', 'adpt_init',
'clk_unprepare_unused_subtree', 'aspeed_socinfo_init',
'rcar_sysc_pd_setup', 'r8a779a0_sysc_pd_setup', 'renesas_soc_init',
'rcar_rst_init', 'rmobile_setup_pm_domain', 'mcp_write_pairing_set',
'a72_b53_rac_enable_all', 'mcp_a72_b53_set',
'brcmstb_soc_device_early_init', 'imx8mq_soc_revision',
'imx8mm_soc_uid', 'imx8mm_soc_revision', 'qe_init',
'exynos5x_clk_init', 'exynos5250_clk_init', 'exynos4_get_xom',
'create_one_cmux', 'create_one_pll', 'p2041_init_periph',
'p4080_init_periph', 'p5020_init_periph', 'p5040_init_periph',
'r9a06g032_clocks_probe', 'r8a73a4_cpg_clocks_init',
'sh73a0_cpg_clocks_init', 'cpg_div6_register',
'r8a7740_cpg_clocks_init', 'cpg_mssr_register_mod_clk',
'cpg_mssr_register_core_clk', 'rcar_gen3_cpg_clk_register',
'cpg_sd_clk_register', 'r7s9210_update_clk_table',
'rz_cpg_read_mode_pins', 'rz_cpg_clocks_init',
'rcar_r8a779a0_cpg_clk_register', 'rcar_gen2_cpg_clk_register',
'sun8i_a33_ccu_setup', 'sun8i_a23_ccu_setup', 'sun5i_ccu_init',
'suniv_f1c100s_ccu_setup', 'sun6i_a31_ccu_setup',
'sun8i_v3_v3s_ccu_init', 'sun50i_h616_ccu_setup',
'sunxi_h3_h5_ccu_init', 'sun4i_ccu_init', 'kona_ccu_init',
'ns2_genpll_scr_clk_init', 'ns2_genpll_sw_clk_init',
'ns2_lcpll_ddr_clk_init', 'ns2_lcpll_ports_clk_init',
'nsp_genpll_clk_init', 'nsp_lcpll0_clk_init',
'cygnus_genpll_clk_init', 'cygnus_lcpll0_clk_init',
'cygnus_mipipll_clk_init', 'cygnus_audiopll_clk_init',
'of_fixed_mmio_clk_setup', 'xdbc_map_pci_mmio', 'xdbc_find_dbgp',
'xdbc_bios_handoff', 'xdbc_early_setup', 'ehci_setup',
'early_xdbc_parse_parameter', 'find_cap', '__find_dbgp',
'nvidia_set_debug_port', 'detect_set_debug_port',
'early_ehci_bios_handoff', 'early_dbgp_init', 'dbgp_init',
'ulpi_init', 'hidg_init', 'xdbc_init', 'brcmstb_usb_pinmap_probe',
'dell_init', 'eisa_init_device', 'mlxcpld_led_probe', 'nas_gpio_init',
'asic3_mfd_probe', 'asic3_probe', 'watchdog_init', 'ssb_modinit',
'pt_init', 'thinkpad_acpi_module_init', 'kbd_init', 'joydev_init',
'evdev_init', 'evbug_init', 'input_leds_init', 'mk712_init',
'l4_add_card', 'ns558_init', 'apanel_init', 'ct82c710_detect',
'i8042_check_aux', 'i8042_check_mux', 'i8042_probe', 'i8042_init',
'i8042_aux_test_irq', 'ocrdma_init_module', 'input_apanel_init',
'cs5535_mfgpt_init', 'geodewdt_probe', 'duramar2150_c2port_init',
'init_ohci1394_dma_on_all_controllers', 'init_ohci1394_controller',
'rionet_init', 'nonstatic_sysfs_init', 'init_pcmcia_bus',
'devlink_class_init', 'switchtec_ntb_init', 'mport_init',
'drivetemp_init', 'omap_vout_probe', 'probe_opti_vlb',
'probe_chip_type', 'legacy_check_special_cases',
'qdi65_identify_port', 'probe_qdi_vlb', 'comedi_init', 'hv_acpi_init',
'pcistub_init_devices_late', 'bcma_host_soc_register',
'bcma_bus_early_register', 'vga_arb_device_init',
'vga_arb_select_default_device', 'zf_init',
'watchdog_deferred_registration', 'wb_smsc_wdt_init',
'w83977f_wdt_init', 'ali_find_watchdog', 'pc87413_init',
'alim7101_wdt_init', 'at91_wdt_init', 'sc1200wdt_probe',
'asr_get_base_address', 'dmi_walk_early', 'dmi_sysfs_init',
'dell_smbios_init', 'acer_wmi_init', 'get_thinkpad_model_data',
'dmi_scan_machine', 'pci_assign_unassigned_resources',
'cpcihp_generic_init', 'pnpacpi_init', 'acpi_early_processor_osc',
'acpi_processor_check_duplicates', 'acpi_early_processor_set_pdc',
'acpi_ec_dsdt_probe', 'cros_ec_lpc_init', 'tpacpi_acpi_handle_locate',
'ks_pcie_init_id', 'ks_pcie_host_init', 'pci_apply_final_quirks',
'intel_uncore_init', 'qedr_init_module', 'isapnp_peek',
'isapnp_isolate', 'init_ipmi_si', 'isapnp_build_device_list',
'pnpacpi_add_device', 'erst_init', 'intel_idle_acpi_cst_extract',
'xen_acpi_processor_init', 'acpi_scan_init', 's3_wmi_probe',
'intel_opregion_present', 'extlog_init', 'intel_pstate_init',
'via_rng_mod_init', 'amd_rng_mod_init', 'ccp_init', 'init_nsc',
'init_atmel', 'intel_rng_hw_init', 'intel_init_hw_struct',
'tlclk_init', 'mwave_init', 'applicom_init', 'hdaps_init',
'tink_board_init', 'ibm_rtl_init', 'samsung_sabi_init',
'samsung_init', 'samsung_backlight_init', 'samsung_rfkill_init_swsmi',
'samsung_lid_handling_init', 'samsung_leds_init', 'samsung_sabi_diag',
'samsung_sabi_infos', 'isst_if_mbox_init', 'pmc_atom_init',
'abituguru_detect', 'hwmon_pci_quirks', 'applesmc_init',
'abituguru3_detect', 'w83627ehf_probe', 'dme1737_isa_detect',
'smsc47m1_probe', 'pcc_cpufreq_init', 'cpufreq_p4_init',
'centrino_init', 'acpi_cpufreq_init', 'pcc_cpufreq_probe',
'intel_pstate_msrs_not_valid',
'intel_pstate_platform_pwr_mgmt_exists', 'acpi_cpufreq_boost_init',
'amd_freq_sensitivity_init', 'gic_fixup_resource', 'do_floppy_init',
'get_fdc_version', 'pf_init', 'pg_init', 'pd_init', 'pcd_init',
'rio_basic_attach]

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