There have been instances when the default size (1M) of the STB is not sufficient to get the complete traces of the failure. In such scenarios we can use a module_param to enable full trace that shall contain more debugging data. This is not a regular case and hence not enabling this capability by default. Co-developed-by: Harsh Jain <Harsh.Jain@xxxxxxx> Signed-off-by: Harsh Jain <Harsh.Jain@xxxxxxx> Signed-off-by: Sanket Goswami <Sanket.Goswami@xxxxxxx> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx> --- v1->v2: - rebase to 'review-hans' branch - drop 2/4 of v1 (https://patchwork.kernel.org/project/platform-driver-x86/list/?series=775324&state=%2A&archive=both) drivers/platform/x86/amd/pmc/pmc.c | 34 +++++++++++++++++++----------- drivers/platform/x86/amd/pmc/pmc.h | 1 + 2 files changed, 23 insertions(+), 12 deletions(-) diff --git a/drivers/platform/x86/amd/pmc/pmc.c b/drivers/platform/x86/amd/pmc/pmc.c index c92dd5077a16..1af7b6ac93bd 100644 --- a/drivers/platform/x86/amd/pmc/pmc.c +++ b/drivers/platform/x86/amd/pmc/pmc.c @@ -53,6 +53,7 @@ /* STB Spill to DRAM Parameters */ #define S2D_TELEMETRY_BYTES_MAX 0x100000 +#define S2D_TELEMETRY_FSIZE_MAX 0x200000 #define S2D_TELEMETRY_DRAMBYTES_MAX 0x1000000 /* STB Spill to DRAM Message Definition */ @@ -160,6 +161,10 @@ static bool disable_workarounds; module_param(disable_workarounds, bool, 0644); MODULE_PARM_DESC(disable_workarounds, "Disable workarounds for platform bugs"); +static bool dump_custom_stb; +module_param(dump_custom_stb, bool, 0644); +MODULE_PARM_DESC(dump_custom_stb, "Enable to dump full STB buffer"); + static struct amd_pmc_dev pmc; static int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool ret); static int amd_pmc_read_stb(struct amd_pmc_dev *dev, u32 *buf); @@ -239,7 +244,7 @@ static const struct file_operations amd_pmc_stb_debugfs_fops = { static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp) { struct amd_pmc_dev *dev = filp->f_inode->i_private; - u32 *buf, fsize, num_samples, val, stb_rdptr_offset = 0; + u32 *buf, num_samples, val, stb_rdptr_offset = 0; int ret; /* Write dummy postcode while reading the STB buffer */ @@ -247,10 +252,6 @@ static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp) if (ret) dev_err(dev->dev, "error writing to STB: %d\n", ret); - buf = kzalloc(S2D_TELEMETRY_BYTES_MAX, GFP_KERNEL); - if (!buf) - return -ENOMEM; - /* Spill to DRAM num_samples uses separate SMU message port */ dev->msg_port = 1; @@ -264,20 +265,27 @@ static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp) dev->msg_port = 0; if (ret) { dev_err(dev->dev, "error: S2D_NUM_SAMPLES not supported : %d\n", ret); - kfree(buf); return ret; } /* Start capturing data from the last push location */ - if (num_samples > S2D_TELEMETRY_BYTES_MAX) { - fsize = S2D_TELEMETRY_BYTES_MAX; - stb_rdptr_offset = num_samples - fsize; + if (dump_custom_stb && + (dev->dram_size - S2D_TELEMETRY_BYTES_MAX <= S2D_TELEMETRY_FSIZE_MAX)) { + dev->fsize = dev->dram_size - S2D_TELEMETRY_BYTES_MAX; + stb_rdptr_offset = 0; + } else if (num_samples > S2D_TELEMETRY_BYTES_MAX) { + dev->fsize = S2D_TELEMETRY_BYTES_MAX; + stb_rdptr_offset = num_samples - dev->fsize; } else { - fsize = num_samples; + dev->fsize = num_samples; stb_rdptr_offset = 0; } - memcpy_fromio(buf, dev->stb_virt_addr + stb_rdptr_offset, fsize); + buf = kzalloc(dev->fsize, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + memcpy_fromio(buf, dev->stb_virt_addr + stb_rdptr_offset, dev->fsize); filp->private_data = buf; return 0; @@ -286,11 +294,13 @@ static int amd_pmc_stb_debugfs_open_v2(struct inode *inode, struct file *filp) static ssize_t amd_pmc_stb_debugfs_read_v2(struct file *filp, char __user *buf, size_t size, loff_t *pos) { + struct amd_pmc_dev *dev = filp->f_inode->i_private; + if (!filp->private_data) return -EINVAL; return simple_read_from_buffer(buf, size, pos, filp->private_data, - S2D_TELEMETRY_BYTES_MAX); + dev->fsize); } static int amd_pmc_stb_debugfs_release_v2(struct inode *inode, struct file *filp) diff --git a/drivers/platform/x86/amd/pmc/pmc.h b/drivers/platform/x86/amd/pmc/pmc.h index c27bd6a5642f..f73d265430b8 100644 --- a/drivers/platform/x86/amd/pmc/pmc.h +++ b/drivers/platform/x86/amd/pmc/pmc.h @@ -26,6 +26,7 @@ struct amd_pmc_dev { u32 dram_size; u32 num_ips; u32 s2d_msg_id; + u32 fsize; /* SMU version information */ u8 smu_program; u8 major; -- 2.25.1
