Re: [PATCH v2] dell_rbu: make firmware payload memory uncachable
Please disregard this version. I'm sorry (and intensely embarrassed).
Re: [PATCH v2] dell_rbu: make firmware payload memory uncachable
Please disregard this version. I'm sorry (and intensely embarrassed).
Re: [PATCH v2] dell_rbu: make firmware payload memory uncachable
Hi Stuart, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc7 next-20180326] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Stuart-Hayes/dell_rbu-make-firmware-payload-memory-uncachable/20180327-153256 config: i386-randconfig-s1-201812 (attached as .config) compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): >> drivers//firmware/dell_rbu.c:48:28: fatal error: asm/set-memory.h: No such >> file or directory #include ^ compilation terminated. vim +48 drivers//firmware/dell_rbu.c > 48 #include 49 --- 0-DAY kernel test infrastructureOpen Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation .config.gz Description: application/gzip
Re: [PATCH v2] dell_rbu: make firmware payload memory uncachable
Hi Stuart, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.16-rc7 next-20180326] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Stuart-Hayes/dell_rbu-make-firmware-payload-memory-uncachable/20180327-153256 config: i386-randconfig-s1-201812 (attached as .config) compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): >> drivers//firmware/dell_rbu.c:48:28: fatal error: asm/set-memory.h: No such >> file or directory #include ^ compilation terminated. vim +48 drivers//firmware/dell_rbu.c > 48 #include 49 --- 0-DAY kernel test infrastructureOpen Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation .config.gz Description: application/gzip
[PATCH v2] dell_rbu: make firmware payload memory uncachable
The dell_rbu driver takes firmware update payloads and puts them in memory so the system BIOS can find them after a reboot. This sometimes fails (though rarely), because the memory containing the payload is in the CPU cache but never gets written back to main memory before the system is rebooted (CPU cache contents are lost on reboot). With this patch, the payload memory will be changed to uncachable to ensure that the payload is actually in main memory before the system is rebooted. Signed-off-by: Stuart Hayes--- v2 Added include, removed extra parentheses This patch has no maintainer. diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c index 2f452f1f7c8a..640a88c3418d 100644 --- a/drivers/firmware/dell_rbu.c +++ b/drivers/firmware/dell_rbu.c @@ -45,6 +45,7 @@ #include #include #include +#include MODULE_AUTHOR("Abhay Salunke "); MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); @@ -180,6 +181,11 @@ static int create_packet(void *data, size_t length) invalid_addr_packet_array[idx++] = packet_data_temp_buf; packet_data_temp_buf = NULL; } + /* +* set to uncachable or it may never get written back before +* reboot +*/ + set_memory_uc(packet_data_temp_buf, 1 << ordernum); } spin_lock(_data.lock); @@ -349,6 +355,7 @@ static void packet_empty_list(void) * to make sure there are no stale RBU packets left in memory */ memset(newpacket->data, 0, rbu_data.packetsize); + set_memory_wb(newpacket->data, 1 << newpacket->ordernum); free_pages((unsigned long) newpacket->data, newpacket->ordernum); kfree(newpacket);
[PATCH v2] dell_rbu: make firmware payload memory uncachable
The dell_rbu driver takes firmware update payloads and puts them in memory so the system BIOS can find them after a reboot. This sometimes fails (though rarely), because the memory containing the payload is in the CPU cache but never gets written back to main memory before the system is rebooted (CPU cache contents are lost on reboot). With this patch, the payload memory will be changed to uncachable to ensure that the payload is actually in main memory before the system is rebooted. Signed-off-by: Stuart Hayes --- v2 Added include, removed extra parentheses This patch has no maintainer. diff --git a/drivers/firmware/dell_rbu.c b/drivers/firmware/dell_rbu.c index 2f452f1f7c8a..640a88c3418d 100644 --- a/drivers/firmware/dell_rbu.c +++ b/drivers/firmware/dell_rbu.c @@ -45,6 +45,7 @@ #include #include #include +#include MODULE_AUTHOR("Abhay Salunke "); MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems"); @@ -180,6 +181,11 @@ static int create_packet(void *data, size_t length) invalid_addr_packet_array[idx++] = packet_data_temp_buf; packet_data_temp_buf = NULL; } + /* +* set to uncachable or it may never get written back before +* reboot +*/ + set_memory_uc(packet_data_temp_buf, 1 << ordernum); } spin_lock(_data.lock); @@ -349,6 +355,7 @@ static void packet_empty_list(void) * to make sure there are no stale RBU packets left in memory */ memset(newpacket->data, 0, rbu_data.packetsize); + set_memory_wb(newpacket->data, 1 << newpacket->ordernum); free_pages((unsigned long) newpacket->data, newpacket->ordernum); kfree(newpacket);