package/kernel/mac80211/patches/brcm/360-v5.2-0003-brcmfmac-reset-PCIe-bus-on-a-firmware-crash.patch

   1 From 4684997d9eea29380000e062755aa6d368d789a3 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Tue, 26 Feb 2019 14:11:19 +0100
   4 Subject: [PATCH] brcmfmac: reset PCIe bus on a firmware crash
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 This includes bus reset & reloading a firmware. It should be sufficient
  10 for a user space to (setup and) use a wireless device again.
  11
  12 Support for reset on USB & SDIO can be added later.
  13
  14 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  15 Reviewed-by: Arend van Spriel <arend.vanspriel@broadcom.com>
  16 Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
  17 ---
  18  .../broadcom/brcm80211/brcmfmac/bus.h         | 10 ++++++
  19  .../broadcom/brcm80211/brcmfmac/core.c        | 12 +++++++
  20  .../broadcom/brcm80211/brcmfmac/core.h        |  2 ++
  21  .../broadcom/brcm80211/brcmfmac/pcie.c        | 35 +++++++++++++++++++
  22  4 files changed, 59 insertions(+)
  23
  24 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h
  25 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h
  26 @@ -91,6 +91,7 @@ struct brcmf_bus_ops {
  27         int (*get_fwname)(struct device *dev, const char *ext,
  28                           unsigned char *fw_name);
  29         void (*debugfs_create)(struct device *dev);
  30 +       int (*reset)(struct device *dev);
  31  };
  32
  33
  34 @@ -245,6 +246,15 @@ void brcmf_bus_debugfs_create(struct brc
  35         return bus->ops->debugfs_create(bus->dev);
  36  }
  37
  38 +static inline
  39 +int brcmf_bus_reset(struct brcmf_bus *bus)
  40 +{
  41 +       if (!bus->ops->reset)
  42 +               return -EOPNOTSUPP;
  43 +
  44 +       return bus->ops->reset(bus->dev);
  45 +}
  46 +
  47  /*
  48   * interface functions from common layer
  49   */
  50 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
  51 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c
  52 @@ -1105,6 +1105,14 @@ static int brcmf_revinfo_read(struct seq
  53         return 0;
  54  }
  55
  56 +static void brcmf_core_bus_reset(struct work_struct *work)
  57 +{
  58 +       struct brcmf_pub *drvr = container_of(work, struct brcmf_pub,
  59 +                                             bus_reset);
  60 +
  61 +       brcmf_bus_reset(drvr->bus_if);
  62 +}
  63 +
  64  static int brcmf_bus_started(struct brcmf_pub *drvr, struct cfg80211_ops *ops)
  65  {
  66         int ret = -1;
  67 @@ -1176,6 +1184,8 @@ static int brcmf_bus_started(struct brcm
  68  #endif
  69  #endif /* CONFIG_INET */
  70
  71 +       INIT_WORK(&drvr->bus_reset, brcmf_core_bus_reset);
  72 +
  73         /* populate debugfs */
  74         brcmf_debugfs_add_entry(drvr, "revinfo", brcmf_revinfo_read);
  75         brcmf_feat_debugfs_create(drvr);
  76 @@ -1302,6 +1312,8 @@ void brcmf_fw_crashed(struct device *dev
  77         bphy_err(drvr, "Firmware has halted or crashed\n");
  78
  79         brcmf_dev_coredump(dev);
  80 +
  81 +       schedule_work(&drvr->bus_reset);
  82  }
  83
  84  void brcmf_detach(struct device *dev)
  85 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
  86 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h
  87 @@ -143,6 +143,8 @@ struct brcmf_pub {
  88         struct notifier_block inet6addr_notifier;
  89         struct brcmf_mp_device *settings;
  90
  91 +       struct work_struct bus_reset;
  92 +
  93         u8 clmver[BRCMF_DCMD_SMLEN];
  94  };
  95
  96 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
  97 +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
  98 @@ -345,6 +345,10 @@ static const u32 brcmf_ring_itemsize[BRC
  99         BRCMF_D2H_MSGRING_RX_COMPLETE_ITEMSIZE
 100  };
 101
 102 +static void brcmf_pcie_setup(struct device *dev, int ret,
 103 +                            struct brcmf_fw_request *fwreq);
 104 +static struct brcmf_fw_request *
 105 +brcmf_pcie_prepare_fw_request(struct brcmf_pciedev_info *devinfo);
 106
 107  static u32
 108  brcmf_pcie_read_reg32(struct brcmf_pciedev_info *devinfo, u32 reg_offset)
 109 @@ -1409,6 +1413,36 @@ int brcmf_pcie_get_fwname(struct device
 110         return 0;
 111  }
 112
 113 +static int brcmf_pcie_reset(struct device *dev)
 114 +{
 115 +       struct brcmf_bus *bus_if = dev_get_drvdata(dev);
 116 +       struct brcmf_pciedev *buspub = bus_if->bus_priv.pcie;
 117 +       struct brcmf_pciedev_info *devinfo = buspub->devinfo;
 118 +       struct brcmf_fw_request *fwreq;
 119 +       int err;
 120 +
 121 +       brcmf_detach(dev);
 122 +
 123 +       brcmf_pcie_release_irq(devinfo);
 124 +       brcmf_pcie_release_scratchbuffers(devinfo);
 125 +       brcmf_pcie_release_ringbuffers(devinfo);
 126 +       brcmf_pcie_reset_device(devinfo);
 127 +
 128 +       fwreq = brcmf_pcie_prepare_fw_request(devinfo);
 129 +       if (!fwreq) {
 130 +               dev_err(dev, "Failed to prepare FW request\n");
 131 +               return -ENOMEM;
 132 +       }
 133 +
 134 +       err = brcmf_fw_get_firmwares(dev, fwreq, brcmf_pcie_setup);
 135 +       if (err) {
 136 +               dev_err(dev, "Failed to prepare FW request\n");
 137 +               kfree(fwreq);
 138 +       }
 139 +
 140 +       return err;
 141 +}
 142 +
 143  static const struct brcmf_bus_ops brcmf_pcie_bus_ops = {
 144         .txdata = brcmf_pcie_tx,
 145         .stop = brcmf_pcie_down,
 146 @@ -1418,6 +1452,7 @@ static const struct brcmf_bus_ops brcmf_
 147         .get_ramsize = brcmf_pcie_get_ramsize,
 148         .get_memdump = brcmf_pcie_get_memdump,
 149         .get_fwname = brcmf_pcie_get_fwname,
 150 +       .reset = brcmf_pcie_reset,
 151  };
 152
 153