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Tue, 21 Jan 2025 13:52:40 +0000 Message-ID: Date: Tue, 21 Jan 2025 14:52:28 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 1/2] Introduce coroutines framework To: Jerome Forissier , u-boot@lists.denx.de Cc: Ilias Apalodimas , Tom Rini , Simon Glass , Bin Meng , Patrick Rudolph , Sughosh Ganu , Heinrich Schuchardt , Raymond Mao References: <24dc7f4c-62bb-46e4-b7d7-6c3aa472c36f@amd.com> <13765dd9-c958-47f6-8076-f10b93561cca@linaro.org> Content-Language: en-US From: Michal Simek Autocrypt: addr=michal.simek@amd.com; keydata= xsFNBFFuvDEBEAC9Amu3nk79+J+4xBOuM5XmDmljuukOc6mKB5bBYOa4SrWJZTjeGRf52VMc howHe8Y9nSbG92obZMqsdt+d/hmRu3fgwRYiiU97YJjUkCN5paHXyBb+3IdrLNGt8I7C9RMy svSoH4WcApYNqvB3rcMtJIna+HUhx8xOk+XCfyKJDnrSuKgx0Svj446qgM5fe7RyFOlGX/wF Ae63Hs0RkFo3I/+hLLJP6kwPnOEo3lkvzm3FMMy0D9VxT9e6Y3afe1UTQuhkg8PbABxhowzj SEnl0ICoqpBqqROV/w1fOlPrm4WSNlZJunYV4gTEustZf8j9FWncn3QzRhnQOSuzTPFbsbH5 WVxwDvgHLRTmBuMw1sqvCc7CofjsD1XM9bP3HOBwCxKaTyOxbPJh3D4AdD1u+cF/lj9Fj255 Es9aATHPvoDQmOzyyRNTQzupN8UtZ+/tB4mhgxWzorpbdItaSXWgdDPDtssJIC+d5+hskys8 B3jbv86lyM+4jh2URpnL1gqOPwnaf1zm/7sqoN3r64cml94q68jfY4lNTwjA/SnaS1DE9XXa XQlkhHgjSLyRjjsMsz+2A4otRLrBbumEUtSMlPfhTi8xUsj9ZfPIUz3fji8vmxZG/Da6jx/c a0UQdFFCL4Ay/EMSoGbQouzhC69OQLWNH3rMQbBvrRbiMJbEZwARAQABzSlNaWNoYWwgU2lt ZWsgKEFNRCkgPG1pY2hhbC5zaW1la0BhbWQuY29tPsLBlAQTAQgAPgIbAwULCQgHAgYVCgkI CwIEFgIDAQIeAQIXgBYhBGc1DJv1zO6bU2Q1ajd8fyH+PR+RBQJkK9VOBQkWf4AXAAoJEDd8 fyH+PR+ROzEP/1IFM7J4Y58SKuvdWDddIvc7JXcal5DpUtMdpuV+ZiHSOgBQRqvwH4CVBK7p ktDCWQAoWCg0KhdGyBjfyVVpm+Gw4DkZovcvMGUlvY5p5w8XxTE5Xx+cj/iDnj83+gy+0Oyz VFU9pew9rnT5YjSRFNOmL2dsorxoT1DWuasDUyitGy9iBegj7vtyAsvEObbGiFcKYSjvurkm MaJ/AwuJehZouKVfWPY/i4UNsDVbQP6iwO8jgPy3pwjt4ztZrl3qs1gV1F4Zrak1k6qoDP5h 19Q5XBVtq4VSS4uLKjofVxrw0J+sHHeTNa3Qgk9nXJEvH2s2JpX82an7U6ccJSdNLYbogQAS BW60bxq6hWEY/afbT+tepEsXepa0y04NjFccFsbECQ4DA3cdA34sFGupUy5h5la/eEf3/8Kd BYcDd+aoxWliMVmL3DudM0Fuj9Hqt7JJAaA0Kt3pwJYwzecl/noK7kFhWiKcJULXEbi3Yf/Y pwCf691kBfrbbP9uDmgm4ZbWIT5WUptt3ziYOWx9SSvaZP5MExlXF4z+/KfZAeJBpZ95Gwm+ FD8WKYjJChMtTfd1VjC4oyFLDUMTvYq77ABkPeKB/WmiAoqMbGx+xQWxW113wZikDy+6WoCS MPXfgMPWpkIUnvTIpF+m1Nyerqf71fiA1W8l0oFmtCF5oTMkzsFNBFFuvDEBEACXqiX5h4IA 03fJOwh+82aQWeHVAEDpjDzK5hSSJZDE55KP8br1FZrgrjvQ9Ma7thSu1mbr+ydeIqoO1/iM fZA+DDPpvo6kscjep11bNhVa0JpHhwnMfHNTSHDMq9OXL9ZZpku/+OXtapISzIH336p4ZUUB 5asad8Ux70g4gmI92eLWBzFFdlyR4g1Vis511Nn481lsDO9LZhKyWelbif7FKKv4p3FRPSbB vEgh71V3NDCPlJJoiHiYaS8IN3uasV/S1+cxVbwz2WcUEZCpeHcY2qsQAEqp4GM7PF2G6gtz IOBUMk7fjku1mzlx4zP7uj87LGJTOAxQUJ1HHlx3Li+xu2oF9Vv101/fsCmptAAUMo7KiJgP Lu8TsP1migoOoSbGUMR0jQpUcKF2L2jaNVS6updvNjbRmFojK2y6A/Bc6WAKhtdv8/e0/Zby iVA7/EN5phZ1GugMJxOLHJ1eqw7DQ5CHcSQ5bOx0Yjmhg4PT6pbW3mB1w+ClAnxhAbyMsfBn XxvvcjWIPnBVlB2Z0YH/gizMDdM0Sa/HIz+q7JR7XkGL4MYeAM15m6O7hkCJcoFV7LMzkNKk OiCZ3E0JYDsMXvmh3S4EVWAG+buA+9beElCmXDcXPI4PinMPqpwmLNcEhPVMQfvAYRqQp2fg 1vTEyK58Ms+0a9L1k5MvvbFg9QARAQABwsF8BBgBCAAmAhsMFiEEZzUMm/XM7ptTZDVqN3x/ If49H5EFAmQr1YsFCRZ/gFoACgkQN3x/If49H5H6BQ//TqDpfCh7Fa5v227mDISwU1VgOPFK eo/+4fF/KNtAtU/VYmBrwT/N6clBxjJYY1i60ekFfAEsCb+vAr1W9geYYpuA+lgR3/BOkHlJ eHf4Ez3D71GnqROIXsObFSFfZWGEgBtHBZ694hKwFmIVCg+lqeMV9nPQKlvfx2n+/lDkspGi epDwFUdfJLHOYxFZMQsFtKJX4fBiY85/U4X2xSp02DxQZj/N2lc9OFrKmFJHXJi9vQCkJdIj S6nuJlvWj/MZKud5QhlfZQsixT9wCeOa6Vgcd4vCzZuptx8gY9FDgb27RQxh/b1ZHalO1h3z kXyouA6Kf54Tv6ab7M/fhNqznnmSvWvQ4EWeh8gddpzHKk8ixw9INBWkGXzqSPOztlJbFiQ3 YPi6o9Pw/IxdQJ9UZ8eCjvIMpXb4q9cZpRLT/BkD4ttpNxma1CUVljkF4DuGydxbQNvJFBK8 ywyA0qgv+Mu+4r/Z2iQzoOgE1SymrNSDyC7u0RzmSnyqaQnZ3uj7OzRkq0fMmMbbrIvQYDS/ y7RkYPOpmElF2pwWI/SXKOgMUgigedGCl1QRUio7iifBmXHkRrTgNT0PWQmeGsWTmfRit2+i l2dpB2lxha72cQ6MTEmL65HaoeANhtfO1se2R9dej57g+urO9V2v/UglZG1wsyaP/vOrgs+3 3i3l5DA= In-Reply-To: <13765dd9-c958-47f6-8076-f10b93561cca@linaro.org> Content-Type: text/plain; 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As explained in the Kconfig file, this is meant >>> to provide some kind of cooperative multi-tasking with the goal to >>> improve performance by overlapping lengthy operations. >>> >>> The API as well as the implementation is very much inspired from libaco >>> [1]. The reference implementation is simplified to remove all things >>> not needed in U-Boot, the coding style is updated, and the aco_ prefix >>> is replaced by co_. >>> >>> I believe the stack handling could be simplified: the stack of the main >>> coroutine could probably probably be used by the secondary coroutines >>> instead of allocating a new stack dynamically. >>> >>> Only i386, x86_64 and aarch64 are supported at the moment. Other >>> architectures need to provide a _co_switch() function in assembly. >>> >>> Only aarch64 has been tested. >> >> I can't see the reason why to keep x86 around if it is not tested. > > OK, I'll drop x86 in v2. > >> Licenses should be cleared for all files. > > I will add "SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later" > to the coroutines C implementation (include/coroutines.h and > lib/coroutines.c) since it originates from libaco which is Apache-2.0 > then was modified by me for U-Boot. I will add GPL-2.0-or-later to > arch/arm/cpu/armv8/co_switch.S since it is a new file written by me. > > >> Also I think this mostly should target full u-boot and not really TPL/SPL as of today. > > I agree, but why do you think it targets xPL? efi_init_obj_list() is > called as a result of "printenv -e" in the main U-Boot for example. > I mentioned in the cover letter that I think coroutines could be > beneficial in other places too. It is build for SPL too if you look at files which are touched. I think you should define separate symbols for SPL/TPL. > >> >> I have applied this patch to measure time difference on kv260 and kd240 and pretty much the time is the same. >> >> diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c >> index 94160f4bd86c..18d2260b8c11 100644 >> --- a/lib/efi_loader/efi_setup.c >> +++ b/lib/efi_loader/efi_setup.c >> @@ -258,6 +258,7 @@ extern int udelay_yield; >>  efi_status_t efi_init_obj_list(void) >>  { >>         efi_status_t ret = EFI_SUCCESS; >> +       ulong t0, t1; >>  #if CONFIG_IS_ENABLED(COROUTINES) >>         struct co_stack *stk = NULL; >>         struct co *main_co = NULL; >> @@ -272,6 +273,7 @@ efi_status_t efi_init_obj_list(void) >>         /* Set up console modes */ >>         efi_setup_console_size(); >> >> +       t0 = timer_get_us(); >>  #if CONFIG_IS_ENABLED(COROUTINES) >>         main_co = co_create(NULL, NULL, 0, NULL, NULL); >>         if (!main_co) { >> @@ -333,6 +335,9 @@ efi_status_t efi_init_obj_list(void) >>                         efi_obj_list_initialized = ret; >>         } >>  #endif >> +       t1 = timer_get_us(); >> + >> +       printf("time counted %ld\n", t1 - t0); >> >>         /* Initialize variable services */ >>         ret = efi_init_variables(); >> >> Please correct me if you have measured it differently. > > That's fine. Do you have a SD card inserted in your board? yes I have. I do use xilinx_zynqmp_kria_defconfig only. > If not, the efi_disks_register() call is very quick and > therefore it makes little difference if it's run > sequentially or in parallel with efi_tcg2_register(). I think in my case where distro boot runs things are initialized already that's why diff is not there. Thanks, Michal