Hi Brian, > -----Original Message----- > From: Brian Norris [mailto:briannorris@xxxxxxxxxxxx] > Sent: 2017年12月6日 2:26 > To: Xinming Hu <huxm@xxxxxxxxxxx> > Cc: Linux Wireless <linux-wireless@xxxxxxxxxxxxxxx>; Kalle Valo > <kvalo@xxxxxxxxxxxxxx>; Dmitry Torokhov <dtor@xxxxxxxxxx>; > rajatja@xxxxxxxxxx; Zhiyuan Yang <yangzy@xxxxxxxxxxx>; Tim Song > <songtao@xxxxxxxxxxx>; Cathy Luo <cluo@xxxxxxxxxxx>; James Cao > <jcao@xxxxxxxxxxx>; Ganapathi Bhat <gbhat@xxxxxxxxxxx>; Ellie Reeves > <ellierevves@xxxxxxxxx> > Subject: [EXT] Re: [PATCH v4 1/3] mwifiex: refactor device dump code to make it > generic for usb interface > > External Email > > ---------------------------------------------------------------------- > Hi, > > On Mon, Dec 04, 2017 at 08:18:42PM +0800, Xinming Hu wrote: > > This patch refactor current device dump code to make it generic for > > subsequent implementation on usb interface. > > I still think you're making the spaghetti worse. I only have a few specific > suggestions for improving your spaghetti code at the moment, but I'm still sure > you could do better. > Ok, Thanks. > > Signed-off-by: Xinming Hu <huxm@xxxxxxxxxxx> > > Signed-off-by: Cathy Luo <cluo@xxxxxxxxxxx> > > Signed-off-by: Ganapathi Bhat <gbhat@xxxxxxxxxxx> > > --- > > v2: Addressed below review comments from Brian Norris > > a) use new API timer_setup/from_timer. > > b) reset devdump_len during initization > > v4: Same as v2,v3 > > --- > > drivers/net/wireless/marvell/mwifiex/init.c | 1 + > > drivers/net/wireless/marvell/mwifiex/main.c | 87 > > +++++++++++++++-------------- > > drivers/net/wireless/marvell/mwifiex/main.h | 11 +++- > > drivers/net/wireless/marvell/mwifiex/pcie.c | 13 +++-- > > drivers/net/wireless/marvell/mwifiex/sdio.c | 14 +++-- > > 5 files changed, 72 insertions(+), 54 deletions(-) > > > > diff --git a/drivers/net/wireless/marvell/mwifiex/init.c > > b/drivers/net/wireless/marvell/mwifiex/init.c > > index e1aa860..b0d3d68 100644 > > --- a/drivers/net/wireless/marvell/mwifiex/init.c > > +++ b/drivers/net/wireless/marvell/mwifiex/init.c > > @@ -314,6 +314,7 @@ static void mwifiex_init_adapter(struct > mwifiex_adapter *adapter) > > adapter->iface_limit.p2p_intf = MWIFIEX_MAX_P2P_NUM; > > adapter->active_scan_triggered = false; > > timer_setup(&adapter->wakeup_timer, wakeup_timer_fn, 0); > > + adapter->devdump_len = 0; > > } > > > > /* > > diff --git a/drivers/net/wireless/marvell/mwifiex/main.c > > b/drivers/net/wireless/marvell/mwifiex/main.c > > index a96bd7e..f7d0299 100644 > > --- a/drivers/net/wireless/marvell/mwifiex/main.c > > +++ b/drivers/net/wireless/marvell/mwifiex/main.c > > @@ -1051,9 +1051,23 @@ void mwifiex_multi_chan_resync(struct > > mwifiex_adapter *adapter) } > > EXPORT_SYMBOL_GPL(mwifiex_multi_chan_resync); > > > > -int mwifiex_drv_info_dump(struct mwifiex_adapter *adapter, void > > **drv_info) > > +void mwifiex_upload_device_dump(struct mwifiex_adapter *adapter) > > { > > - void *p; > > + /* Dump all the memory data into single file, a userspace script will > > + * be used to split all the memory data to multiple files > > + */ > > + mwifiex_dbg(adapter, MSG, > > + "== mwifiex dump information to /sys/class/devcoredump > start\n"); > > + dev_coredumpv(adapter->dev, adapter->devdump_data, > adapter->devdump_len, > > + GFP_KERNEL); > > Seems like you should reset adapter->devdump_data and ->devdump_len here, > so you don't accidentally reuse it? (You're expecting > dev_coredumpv() to free the buffer, no?) > Oh, yes, I was expect dev_coredumpv to free the buffer, the dev_coredump framework will free dump data after 5 minutes. What's more, If there is new coredump in 5 minutes, the new dump data will be discard and free. Consider below sequence happens in command timeout context: Mwifiex_cmd_tmo_func (1) --> firmware dump 1 --> devcoredump 1 (2) --> card_reset --> init software Command timeout happens again in 5 minutes --> firmware dump 2 --> devcoredump 2 Here, if we free adapter-> devdump_data, and then user cat devcoredump1, will crash the kernel I think, here, Regards "reset adapter->devdump_data", you mean adapter->devdump_data = NULL, But not free it, right ? > > + mwifiex_dbg(adapter, MSG, > > + "== mwifiex dump information to /sys/class/devcoredump > end\n"); > > +} EXPORT_SYMBOL_GPL(mwifiex_upload_device_dump); > > + > > +void mwifiex_drv_info_dump(struct mwifiex_adapter *adapter) { > > + char *p; > > char drv_version[64]; > > struct usb_card_rec *cardp; > > struct sdio_mmc_card *sdio_card; > > @@ -1061,17 +1075,12 @@ int mwifiex_drv_info_dump(struct > mwifiex_adapter *adapter, void **drv_info) > > int i, idx; > > struct netdev_queue *txq; > > struct mwifiex_debug_info *debug_info; > > - void *drv_info_dump; > > > > mwifiex_dbg(adapter, MSG, "===mwifiex driverinfo dump start===\n"); > > > > - /* memory allocate here should be free in mwifiex_upload_device_dump*/ > > - drv_info_dump = vzalloc(MWIFIEX_DRV_INFO_SIZE_MAX); > > - > > - if (!drv_info_dump) > > - return 0; > > - > > - p = (char *)(drv_info_dump); > > + p = adapter->devdump_data; > > + strcpy(p, "========Start dump driverinfo========\n"); > > + p += strlen("========Start dump driverinfo========\n"); > > p += sprintf(p, "driver_name = " "\"mwifiex\"\n"); > > > > mwifiex_drv_get_driver_version(adapter, drv_version, @@ -1155,21 > > +1164,18 @@ int mwifiex_drv_info_dump(struct mwifiex_adapter *adapter, > void **drv_info) > > kfree(debug_info); > > } > > > > + strcpy(p, "\n========End dump========\n"); > > + p += strlen("\n========End dump========\n"); > > mwifiex_dbg(adapter, MSG, "===mwifiex driverinfo dump end===\n"); > > - *drv_info = drv_info_dump; > > - return p - drv_info_dump; > > + adapter->devdump_len = p - (char *)adapter->devdump_data; > > } > > EXPORT_SYMBOL_GPL(mwifiex_drv_info_dump); > > > > -void mwifiex_upload_device_dump(struct mwifiex_adapter *adapter, void > *drv_info, > > - int drv_info_size) > > +void mwifiex_prepare_fw_dump_info(struct mwifiex_adapter *adapter) > > { > > - u8 idx, *dump_data, *fw_dump_ptr; > > - u32 dump_len; > > - > > - dump_len = (strlen("========Start dump driverinfo========\n") + > > - drv_info_size + > > - strlen("\n========End dump========\n")); > > + u8 idx; > > + char *fw_dump_ptr; > > + u32 dump_len = 0; > > > > for (idx = 0; idx < adapter->num_mem_types; idx++) { > > struct memory_type_mapping *entry = @@ -1184,24 +1190,24 @@ > void > > mwifiex_upload_device_dump(struct mwifiex_adapter *adapter, void > *drv_info, > > } > > } > > > > - dump_data = vzalloc(dump_len + 1); > > - if (!dump_data) > > - goto done; > > - > > - fw_dump_ptr = dump_data; > > + if (dump_len + 1 + adapter->devdump_len > MWIFIEX_FW_DUMP_SIZE) { > > + /* Realloc in case buffer overflow */ > > + fw_dump_ptr = vzalloc(dump_len + 1 + adapter->devdump_len); > > + mwifiex_dbg(adapter, MSG, "Realloc device dump data.\n"); > > + if (!fw_dump_ptr) { > > + vfree(adapter->devdump_data); > > + mwifiex_dbg(adapter, ERROR, > > + "vzalloc devdump data failure!\n"); > > + return; > > + } > > > > - /* Dump all the memory data into single file, a userspace script will > > - * be used to split all the memory data to multiple files > > - */ > > - mwifiex_dbg(adapter, MSG, > > - "== mwifiex dump information to /sys/class/devcoredump > start"); > > + memmove(fw_dump_ptr, adapter->devdump_data, > > + adapter->devdump_len); > > + vfree(adapter->devdump_data); > > + adapter->devdump_data = fw_dump_ptr; > > + } > > > > - strcpy(fw_dump_ptr, "========Start dump driverinfo========\n"); > > - fw_dump_ptr += strlen("========Start dump driverinfo========\n"); > > - memcpy(fw_dump_ptr, drv_info, drv_info_size); > > - fw_dump_ptr += drv_info_size; > > - strcpy(fw_dump_ptr, "\n========End dump========\n"); > > - fw_dump_ptr += strlen("\n========End dump========\n"); > > + fw_dump_ptr = (char *)adapter->devdump_data + > adapter->devdump_len; > > > > for (idx = 0; idx < adapter->num_mem_types; idx++) { > > struct memory_type_mapping *entry = @@ -1228,11 +1234,8 @@ > void > > mwifiex_upload_device_dump(struct mwifiex_adapter *adapter, void > *drv_info, > > /* device dump data will be free in device coredump release function > > * after 5 min > > */ > > ^^ This comment is a bit out of place now. The data is not dumped until we call > mwifiex_upload_device_dump(), and so we don't guarantee anyone will > actually free it for us until then > Okay. > > - dev_coredumpv(adapter->dev, dump_data, dump_len, GFP_KERNEL); > > - mwifiex_dbg(adapter, MSG, > > - "== mwifiex dump information to /sys/class/devcoredump end"); > > + adapter->devdump_len = fw_dump_ptr - (char *)adapter->devdump_data; > > > > -done: > > for (idx = 0; idx < adapter->num_mem_types; idx++) { > > struct memory_type_mapping *entry = > > &adapter->mem_type_mapping_tbl[idx]; > > @@ -1241,10 +1244,8 @@ void mwifiex_upload_device_dump(struct > mwifiex_adapter *adapter, void *drv_info, > > entry->mem_ptr = NULL; > > entry->mem_size = 0; > > } > > - > > - vfree(drv_info); > > } > > -EXPORT_SYMBOL_GPL(mwifiex_upload_device_dump); > > +EXPORT_SYMBOL_GPL(mwifiex_prepare_fw_dump_info); > > > > /* > > * CFG802.11 network device handler for statistics retrieval. > > diff --git a/drivers/net/wireless/marvell/mwifiex/main.h > > b/drivers/net/wireless/marvell/mwifiex/main.h > > index 154c079..8b6241a 100644 > > --- a/drivers/net/wireless/marvell/mwifiex/main.h > > +++ b/drivers/net/wireless/marvell/mwifiex/main.h > > @@ -94,6 +94,8 @@ enum { > > > > #define MAX_EVENT_SIZE 2048 > > > > +#define MWIFIEX_FW_DUMP_SIZE (2 * 1024 * 1024) > > + > > #define ARP_FILTER_MAX_BUF_SIZE 68 > > > > #define MWIFIEX_KEY_BUFFER_SIZE 16 > > @@ -1032,6 +1034,9 @@ struct mwifiex_adapter { > > bool wake_by_wifi; > > /* Aggregation parameters*/ > > struct bus_aggr_params bus_aggr; > > + /* Device dump data/length */ > > + void *devdump_data; > > + int devdump_len; > > }; > > > > void mwifiex_process_tx_queue(struct mwifiex_adapter *adapter); @@ > > -1656,9 +1661,9 @@ void mwifiex_hist_data_add(struct mwifiex_private > > *priv, > > u8 mwifiex_adjust_data_rate(struct mwifiex_private *priv, > > u8 rx_rate, u8 ht_info); > > > > -int mwifiex_drv_info_dump(struct mwifiex_adapter *adapter, void > > **drv_info); -void mwifiex_upload_device_dump(struct mwifiex_adapter > *adapter, void *drv_info, > > - int drv_info_size); > > +void mwifiex_drv_info_dump(struct mwifiex_adapter *adapter); void > > +mwifiex_prepare_fw_dump_info(struct mwifiex_adapter *adapter); void > > +mwifiex_upload_device_dump(struct mwifiex_adapter *adapter); > > void *mwifiex_alloc_dma_align_buf(int rx_len, gfp_t flags); void > > mwifiex_queue_main_work(struct mwifiex_adapter *adapter); int > > mwifiex_get_wakeup_reason(struct mwifiex_private *priv, u16 action, > > diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c > > b/drivers/net/wireless/marvell/mwifiex/pcie.c > > index cd31494..f666cb2 100644 > > --- a/drivers/net/wireless/marvell/mwifiex/pcie.c > > +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c > > @@ -2769,12 +2769,17 @@ static void mwifiex_pcie_fw_dump(struct > > mwifiex_adapter *adapter) > > > > static void mwifiex_pcie_device_dump_work(struct mwifiex_adapter > > *adapter) { > > - int drv_info_size; > > - void *drv_info; > > + adapter->devdump_data = vzalloc(MWIFIEX_FW_DUMP_SIZE); > > I'm still not sure why you need 3 different callers to allocate the same size > buffer. It seems like this should all be done in the core. > I had thought of put memory allocation and drv_info_dump into 1 function , and let it called in device_dump. But it looks quite strange. Consider the different implementation on usb, let these sub functions works in a loose coupling way seems better to reuse than a "core" architecture. Please let us know if you have more suggestions to enhance this part Thanks & Regards, Simon > Brian > > > + if (!adapter->devdump_data) { > > + mwifiex_dbg(adapter, ERROR, > > + "vzalloc devdump data failure!\n"); > > + return; > > + } > > > > - drv_info_size = mwifiex_drv_info_dump(adapter, &drv_info); > > + mwifiex_drv_info_dump(adapter); > > mwifiex_pcie_fw_dump(adapter); > > - mwifiex_upload_device_dump(adapter, drv_info, drv_info_size); > > + mwifiex_prepare_fw_dump_info(adapter); > > + mwifiex_upload_device_dump(adapter); > > } > > > > static void mwifiex_pcie_card_reset_work(struct mwifiex_adapter > > *adapter) diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c > > b/drivers/net/wireless/marvell/mwifiex/sdio.c > > index fd5183c..a828801 100644 > > --- a/drivers/net/wireless/marvell/mwifiex/sdio.c > > +++ b/drivers/net/wireless/marvell/mwifiex/sdio.c > > @@ -2505,15 +2505,21 @@ static void > > mwifiex_sdio_generic_fw_dump(struct mwifiex_adapter *adapter) static > > void mwifiex_sdio_device_dump_work(struct mwifiex_adapter *adapter) { > > struct sdio_mmc_card *card = adapter->card; > > - int drv_info_size; > > - void *drv_info; > > > > - drv_info_size = mwifiex_drv_info_dump(adapter, &drv_info); > > + adapter->devdump_data = vzalloc(MWIFIEX_FW_DUMP_SIZE); > > + if (!adapter->devdump_data) { > > + mwifiex_dbg(adapter, ERROR, > > + "vzalloc devdump data failure!\n"); > > + return; > > + } > > + > > + mwifiex_drv_info_dump(adapter); > > if (card->fw_dump_enh) > > mwifiex_sdio_generic_fw_dump(adapter); > > else > > mwifiex_sdio_fw_dump(adapter); > > - mwifiex_upload_device_dump(adapter, drv_info, drv_info_size); > > + mwifiex_prepare_fw_dump_info(adapter); > > + mwifiex_upload_device_dump(adapter); > > } > > > > static void mwifiex_sdio_work(struct work_struct *work) > > -- > > 1.9.1 > >
