From: Daniel Vetter Date: Wed, 16 Oct 2013 11:30:34 +0000 (+0200) Subject: drm/i915: Add a control file for pipe CRCs X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=926321d503406d1fefb2fae9651beca14160529a;p=linux-beck.git drm/i915: Add a control file for pipe CRCs Note the "return -ENODEV;" in pipe_crc_set_source(). The ctl file is disabled until the end of the series to be able to do incremental improvements. Signed-off-by: Damien Lespiau Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index e1d45aaf6881..0d8a9a397a24 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -27,6 +27,7 @@ */ #include +#include #include #include #include @@ -1742,8 +1743,8 @@ static int i915_pipe_crc(struct seq_file *m, void *data) int i; int start; - if (!IS_IVYBRIDGE(dev)) { - seq_puts(m, "unsupported\n"); + if (dev_priv->pipe_crc[pipe].source == INTEL_PIPE_CRC_SOURCE_NONE) { + seq_puts(m, "none\n"); return 0; } @@ -1762,6 +1763,217 @@ static int i915_pipe_crc(struct seq_file *m, void *data) return 0; } +static const char *pipe_crc_sources[] = { + "none", + "plane1", + "plane2", + "pf", +}; + +static const char *pipe_crc_source_name(enum intel_pipe_crc_source source) +{ + BUILD_BUG_ON(ARRAY_SIZE(pipe_crc_sources) != INTEL_PIPE_CRC_SOURCE_MAX); + return pipe_crc_sources[source]; +} + +static int pipe_crc_ctl_show(struct seq_file *m, void *data) +{ + struct drm_device *dev = m->private; + struct drm_i915_private *dev_priv = dev->dev_private; + int i; + + for (i = 0; i < I915_MAX_PIPES; i++) + seq_printf(m, "%c %s\n", pipe_name(i), + pipe_crc_source_name(dev_priv->pipe_crc[i].source)); + + return 0; +} + +static int pipe_crc_ctl_open(struct inode *inode, struct file *file) +{ + struct drm_device *dev = inode->i_private; + + return single_open(file, pipe_crc_ctl_show, dev); +} + +static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe, + enum intel_pipe_crc_source source) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + u32 val; + + + return -ENODEV; + + if (!IS_IVYBRIDGE(dev)) + return -ENODEV; + + dev_priv->pipe_crc[pipe].source = source; + + switch (source) { + case INTEL_PIPE_CRC_SOURCE_PLANE1: + val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PRIMARY_IVB; + break; + case INTEL_PIPE_CRC_SOURCE_PLANE2: + val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_SPRITE_IVB; + break; + case INTEL_PIPE_CRC_SOURCE_PF: + val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PF_IVB; + break; + case INTEL_PIPE_CRC_SOURCE_NONE: + default: + val = 0; + break; + } + + I915_WRITE(PIPE_CRC_CTL(pipe), val); + POSTING_READ(PIPE_CRC_CTL(pipe)); + + return 0; +} + +/* + * Parse pipe CRC command strings: + * command: wsp* pipe wsp+ source wsp* + * pipe: (A | B | C) + * source: (none | plane1 | plane2 | pf) + * wsp: (#0x20 | #0x9 | #0xA)+ + * + * eg.: + * "A plane1" -> Start CRC computations on plane1 of pipe A + * "A none" -> Stop CRC + */ +static int pipe_crc_ctl_tokenize(char *buf, char *words[], int max_words) +{ + int n_words = 0; + + while (*buf) { + char *end; + + /* skip leading white space */ + buf = skip_spaces(buf); + if (!*buf) + break; /* end of buffer */ + + /* find end of word */ + for (end = buf; *end && !isspace(*end); end++) + ; + + if (n_words == max_words) { + DRM_DEBUG_DRIVER("too many words, allowed <= %d\n", + max_words); + return -EINVAL; /* ran out of words[] before bytes */ + } + + if (*end) + *end++ = '\0'; + words[n_words++] = buf; + buf = end; + } + + return n_words; +} + +static int pipe_crc_ctl_parse_pipe(const char *buf, enum pipe *pipe) +{ + const char name = buf[0]; + + if (name < 'A' || name >= pipe_name(I915_MAX_PIPES)) + return -EINVAL; + + *pipe = name - 'A'; + + return 0; +} + +static int +pipe_crc_ctl_parse_source(const char *buf, enum intel_pipe_crc_source *source) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(pipe_crc_sources); i++) + if (!strcmp(buf, pipe_crc_sources[i])) { + *source = i; + return 0; + } + + return -EINVAL; +} + +static int pipe_crc_ctl_parse(struct drm_device *dev, char *buf, size_t len) +{ +#define MAX_WORDS 2 + int n_words; + char *words[MAX_WORDS]; + enum pipe pipe; + enum intel_pipe_crc_source source; + + n_words = pipe_crc_ctl_tokenize(buf, words, MAX_WORDS); + if (n_words != 2) { + DRM_DEBUG_DRIVER("tokenize failed, a command is 2 words\n"); + return -EINVAL; + } + + if (pipe_crc_ctl_parse_pipe(words[0], &pipe) < 0) { + DRM_DEBUG_DRIVER("unknown pipe %s\n", words[0]); + return -EINVAL; + } + + if (pipe_crc_ctl_parse_source(words[1], &source) < 0) { + DRM_DEBUG_DRIVER("unknown source %s\n", words[1]); + return -EINVAL; + } + + return pipe_crc_set_source(dev, pipe, source); +} + +static ssize_t pipe_crc_ctl_write(struct file *file, const char __user *ubuf, + size_t len, loff_t *offp) +{ + struct seq_file *m = file->private_data; + struct drm_device *dev = m->private; + char *tmpbuf; + int ret; + + if (len == 0) + return 0; + + if (len > PAGE_SIZE - 1) { + DRM_DEBUG_DRIVER("expected <%lu bytes into pipe crc control\n", + PAGE_SIZE); + return -E2BIG; + } + + tmpbuf = kmalloc(len + 1, GFP_KERNEL); + if (!tmpbuf) + return -ENOMEM; + + if (copy_from_user(tmpbuf, ubuf, len)) { + ret = -EFAULT; + goto out; + } + tmpbuf[len] = '\0'; + + ret = pipe_crc_ctl_parse(dev, tmpbuf, len); + +out: + kfree(tmpbuf); + if (ret < 0) + return ret; + + *offp += len; + return len; +} + +static const struct file_operations i915_pipe_crc_ctl_fops = { + .owner = THIS_MODULE, + .open = pipe_crc_ctl_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, + .write = pipe_crc_ctl_write +}; + static int i915_wedged_get(void *data, u64 *val) { @@ -2297,6 +2509,7 @@ static struct i915_debugfs_files { {"i915_gem_drop_caches", &i915_drop_caches_fops}, {"i915_error_state", &i915_error_state_fops}, {"i915_next_seqno", &i915_next_seqno_fops}, + {"i915_pipe_crc_ctl", &i915_pipe_crc_ctl_fops}, }; int i915_debugfs_init(struct drm_minor *minor) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index b040ef82208f..bfaaaaee8a5b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1217,6 +1217,14 @@ struct i915_package_c8 { } regsave; }; +enum intel_pipe_crc_source { + INTEL_PIPE_CRC_SOURCE_NONE, + INTEL_PIPE_CRC_SOURCE_PLANE1, + INTEL_PIPE_CRC_SOURCE_PLANE2, + INTEL_PIPE_CRC_SOURCE_PF, + INTEL_PIPE_CRC_SOURCE_MAX, +}; + struct intel_pipe_crc_entry { uint32_t timestamp; uint32_t crc[5]; @@ -1225,6 +1233,7 @@ struct intel_pipe_crc_entry { #define INTEL_PIPE_CRC_ENTRIES_NR 200 struct intel_pipe_crc { struct intel_pipe_crc_entry entries[INTEL_PIPE_CRC_ENTRIES_NR]; + enum intel_pipe_crc_source source; atomic_t slot; };