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Wed, 29 Mar 2023 23:08:06 -0700 (PDT) Date: Wed, 29 Mar 2023 23:08:02 -0700 Mime-Version: 1.0 X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230329230734.BlueZ.v5.1.I21ac5a143b0e42eef4ff71ef04ef0e53a294932a@changeid> Subject: [BlueZ PATCH v5 1/2] vhci: Add support to trigger devcoredump and read the dump file From: Manish Mandlik To: marcel@holtmann.org, luiz.dentz@gmail.com Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Manish Mandlik Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Add vhci support to trigger the hci devcoredump by writing to force_devcoredump debugfs entry and read the generated devcoredump file. --- Changes in v5: - Refactor vhci_read_devcd() Changes in v4: - Split into two patches - vhci patch and mgmt-tester patch Changes in v3: - Fix compiler warning for signed comparision in test_hci_devcd() Changes in v2: - Rename function names to *_devcd emulator/vhci.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++- emulator/vhci.h | 2 ++ 2 files changed, 62 insertions(+), 1 deletion(-) diff --git a/emulator/vhci.c b/emulator/vhci.c index a12b11e0f..ecf1db3c7 100644 --- a/emulator/vhci.c +++ b/emulator/vhci.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "lib/bluetooth.h" #include "lib/hci.h" @@ -32,6 +33,7 @@ #include "vhci.h" #define DEBUGFS_PATH "/sys/kernel/debug/bluetooth" +#define DEVCORE_PATH "/sys/class/devcoredump" struct vhci { enum btdev_type type; @@ -184,7 +186,7 @@ struct btdev *vhci_get_btdev(struct vhci *vhci) return vhci->btdev; } -static int vhci_debugfs_write(struct vhci *vhci, char *option, void *data, +static int vhci_debugfs_write(struct vhci *vhci, char *option, const void *data, size_t len) { char path[64]; @@ -267,3 +269,60 @@ int vhci_set_force_static_address(struct vhci *vhci, bool enable) return vhci_debugfs_write(vhci, "force_static_address", &val, sizeof(val)); } + +int vhci_force_devcd(struct vhci *vhci, const void *data, size_t len) +{ + return vhci_debugfs_write(vhci, "force_devcoredump", data, len); +} + +int vhci_read_devcd(struct vhci *vhci, void *buf, size_t size) +{ + DIR *dir; + struct dirent *entry; + char filename[PATH_MAX]; + int fd; + int ret; + + dir = opendir(DEVCORE_PATH); + if (dir == NULL) + return -errno; + + while ((entry = readdir(dir)) != NULL) { + if (strstr(entry->d_name, "devcd")) + break; + } + + if (entry == NULL) { + ret = -ENOENT; + goto close_dir; + } + + sprintf(filename, DEVCORE_PATH "/%s/data", entry->d_name); + fd = open(filename, O_RDWR); + if (fd < 0) { + ret = -errno; + goto close_dir; + } + + ret = read(fd, buf, size); + if (ret < 0) { + ret = -errno; + goto close_file; + } + + /* Once the devcoredump is read, write anything to it to mark it for + * cleanup. + */ + if (write(fd, "0", 1) < 0) { + ret = -errno; + goto close_file; + } + +close_file: + close(fd); + +close_dir: + closedir(dir); + + return ret; +} diff --git a/emulator/vhci.h b/emulator/vhci.h index 6da56cb58..68eae4c4a 100644 --- a/emulator/vhci.h +++ b/emulator/vhci.h @@ -29,3 +29,5 @@ int vhci_set_msft_opcode(struct vhci *vhci, uint16_t opcode); int vhci_set_aosp_capable(struct vhci *vhci, bool enable); int vhci_set_emu_opcode(struct vhci *vhci, uint16_t opcode); int vhci_set_force_static_address(struct vhci *vhci, bool enable); +int vhci_force_devcd(struct vhci *vhci, const void *data, size_t len); +int vhci_read_devcd(struct vhci *vhci, void *buf, size_t size);