leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915: struct_mutex is not required for allocating the framebuffer

Browse Source 
We do not need the BKL struct_mutex in order to allocate a GEM object,
nor to create the framebuffer, so resist the temptation to take the BKL
willy nilly. As this changes the locking contract around internal API
calls, the patch is a little larger than a plain removal of a pair of
mutex_lock/unlock.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170215105919.7347-2-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-02-15 10:59:18 +00:00
parent 70001cd256
commit 24dbf51a55
3 changed files with 59 additions and 78 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

109
drivers/gpu/drm/i915/intel_display.c
View File

@ -96,10 +96,9 @@ static void i9xx_crtc_clock_get(struct intel_crtc *crtc,
static void ironlake_pch_clock_get(struct intel_crtc *crtc,
struct intel_crtc_state *pipe_config);
static int intel_framebuffer_init(struct drm_device *dev,
struct intel_framebuffer *ifb,
struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_i915_gem_object *obj);
static int intel_framebuffer_init(struct intel_framebuffer *ifb,
struct drm_i915_gem_object *obj,
struct drm_mode_fb_cmd2 *mode_cmd);
static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc);
static void intel_set_pipe_timings(struct intel_crtc *intel_crtc);
static void intel_set_pipe_src_size(struct intel_crtc *intel_crtc);
@ -2052,11 +2051,13 @@ static void intel_tile_dims(const struct drm_i915_private *dev_priv,
}
unsigned int
intel_fb_align_height(struct drm_device *dev, unsigned int height,
uint32_t pixel_format, uint64_t fb_modifier)
intel_fb_align_height(struct drm_i915_private *dev_priv,
unsigned int height,
uint32_t pixel_format,
uint64_t fb_modifier)
{
unsigned int cpp = drm_format_plane_cpp(pixel_format, 0);
unsigned int tile_height = intel_tile_height(to_i915(dev), fb_modifier, cpp);
unsigned int tile_height = intel_tile_height(dev_priv, fb_modifier, cpp);
return ALIGN(height, tile_height);
}
@ -2622,15 +2623,13 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
return false;
mutex_lock(&dev->struct_mutex);
obj = i915_gem_object_create_stolen_for_preallocated(dev_priv,
base_aligned,
base_aligned,
size_aligned);
if (!obj) {
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&dev->struct_mutex);
if (!obj)
return false;
}
if (plane_config->tiling == I915_TILING_X)
obj->tiling_and_stride = fb->pitches[0] | I915_TILING_X;
@ -2642,20 +2641,17 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
mode_cmd.modifier[0] = fb->modifier;
mode_cmd.flags = DRM_MODE_FB_MODIFIERS;
if (intel_framebuffer_init(dev, to_intel_framebuffer(fb),
&mode_cmd, obj)) {
if (intel_framebuffer_init(to_intel_framebuffer(fb), obj, &mode_cmd)) {
DRM_DEBUG_KMS("intel fb init failed\n");
goto out_unref_obj;
}
mutex_unlock(&dev->struct_mutex);
DRM_DEBUG_KMS("initial plane fb obj %p\n", obj);
return true;
out_unref_obj:
i915_gem_object_put(obj);
mutex_unlock(&dev->struct_mutex);
return false;
}
@ -7434,7 +7430,8 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
val = I915_READ(DSPSTRIDE(pipe));
fb->pitches[0] = val & 0xffffffc0;
aligned_height = intel_fb_align_height(dev, fb->height,
aligned_height = intel_fb_align_height(dev_priv,
fb->height,
fb->format->format,
fb->modifier);
@ -8475,7 +8472,8 @@ skylake_get_initial_plane_config(struct intel_crtc *crtc,
fb->format->format);
fb->pitches[0] = (val & 0x3ff) * stride_mult;
aligned_height = intel_fb_align_height(dev, fb->height,
aligned_height = intel_fb_align_height(dev_priv,
fb->height,
fb->format->format,
fb->modifier);
@ -8573,7 +8571,8 @@ ironlake_get_initial_plane_config(struct intel_crtc *crtc,
val = I915_READ(DSPSTRIDE(pipe));
fb->pitches[0] = val & 0xffffffc0;
aligned_height = intel_fb_align_height(dev, fb->height,
aligned_height = intel_fb_align_height(dev_priv,
fb->height,
fb->format->format,
fb->modifier);
@ -9399,9 +9398,8 @@ static struct drm_display_mode load_detect_mode = {
};
struct drm_framebuffer *
__intel_framebuffer_create(struct drm_device *dev,
struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_i915_gem_object *obj)
intel_framebuffer_create(struct drm_i915_gem_object *obj,
struct drm_mode_fb_cmd2 *mode_cmd)
{
struct intel_framebuffer *intel_fb;
int ret;
@ -9410,7 +9408,7 @@ __intel_framebuffer_create(struct drm_device *dev,
if (!intel_fb)
return ERR_PTR(-ENOMEM);
ret = intel_framebuffer_init(dev, intel_fb, mode_cmd, obj);
ret = intel_framebuffer_init(intel_fb, obj, mode_cmd);
if (ret)
goto err;
@ -9421,23 +9419,6 @@ err:
return ERR_PTR(ret);
}
static struct drm_framebuffer *
intel_framebuffer_create(struct drm_device *dev,
struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_i915_gem_object *obj)
{
struct drm_framebuffer *fb;
int ret;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ERR_PTR(ret);
fb = __intel_framebuffer_create(dev, mode_cmd, obj);
mutex_unlock(&dev->struct_mutex);
return fb;
}
static u32
intel_framebuffer_pitch_for_width(int width, int bpp)
{
@ -9472,7 +9453,7 @@ intel_framebuffer_create_for_mode(struct drm_device *dev,
bpp);
mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
fb = intel_framebuffer_create(dev, &mode_cmd, obj);
fb = intel_framebuffer_create(obj, &mode_cmd);
if (IS_ERR(fb))
i915_gem_object_put(obj);
@ -14319,7 +14300,7 @@ static
u32 intel_fb_pitch_limit(struct drm_i915_private *dev_priv,
uint64_t fb_modifier, uint32_t pixel_format)
{
u32 gen = INTEL_INFO(dev_priv)->gen;
u32 gen = INTEL_GEN(dev_priv);
if (gen >= 9) {
int cpp = drm_format_plane_cpp(pixel_format, 0);
@ -14346,18 +14327,17 @@ u32 intel_fb_pitch_limit(struct drm_i915_private *dev_priv,
}
}
static int intel_framebuffer_init(struct drm_device *dev,
struct intel_framebuffer *intel_fb,
struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_i915_gem_object *obj)
static int intel_framebuffer_init(struct intel_framebuffer *intel_fb,
struct drm_i915_gem_object *obj,
struct drm_mode_fb_cmd2 *mode_cmd)
{
struct drm_i915_private *dev_priv = to_i915(dev);
struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
unsigned int tiling = i915_gem_object_get_tiling(obj);
int ret;
u32 pitch_limit, stride_alignment;
struct drm_format_name_buf format_name;
int ret = -EINVAL;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
atomic_inc(&obj->framebuffer_references);
if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
/*
@ -14367,14 +14347,14 @@ static int intel_framebuffer_init(struct drm_device *dev,
if (tiling != I915_TILING_NONE &&
tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
DRM_DEBUG("tiling_mode doesn't match fb modifier\n");
return -EINVAL;
goto err;
}
} else {
if (tiling == I915_TILING_X) {
mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
} else if (tiling == I915_TILING_Y) {
DRM_DEBUG("No Y tiling for legacy addfb\n");
return -EINVAL;
goto err;
}
}
@ -14385,7 +14365,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
if (INTEL_GEN(dev_priv) < 9) {
DRM_DEBUG("Unsupported tiling 0x%llx!\n",
mode_cmd->modifier[0]);
return -EINVAL;
goto err;
}
case DRM_FORMAT_MOD_NONE:
case I915_FORMAT_MOD_X_TILED:
@ -14393,7 +14373,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
default:
DRM_DEBUG("Unsupported fb modifier 0x%llx!\n",
mode_cmd->modifier[0]);
return -EINVAL;
goto err;
}
/*
@ -14412,7 +14392,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
if (mode_cmd->pitches[0] & (stride_alignment - 1)) {
DRM_DEBUG("pitch (%d) must be at least %u byte aligned\n",
mode_cmd->pitches[0], stride_alignment);
return -EINVAL;
goto err;
}
pitch_limit = intel_fb_pitch_limit(dev_priv, mode_cmd->modifier[0],
@ -14422,7 +14402,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
mode_cmd->modifier[0] != DRM_FORMAT_MOD_NONE ?
"tiled" : "linear",
mode_cmd->pitches[0], pitch_limit);
return -EINVAL;
goto err;
}
/*
@ -14434,7 +14414,7 @@ static int intel_framebuffer_init(struct drm_device *dev,
DRM_DEBUG("pitch (%d) must match tiling stride (%d)\n",
mode_cmd->pitches[0],
i915_gem_object_get_stride(obj));
return -EINVAL;
goto err;
}
/* Reject formats not supported by any plane early. */
@ -14493,24 +14473,29 @@ static int intel_framebuffer_init(struct drm_device *dev,
/* FIXME need to adjust LINOFF/TILEOFF accordingly. */
if (mode_cmd->offsets[0] != 0)
return -EINVAL;
goto err;
drm_helper_mode_fill_fb_struct(dev, &intel_fb->base, mode_cmd);
drm_helper_mode_fill_fb_struct(&dev_priv->drm,
&intel_fb->base, mode_cmd);
intel_fb->obj = obj;
ret = intel_fill_fb_info(dev_priv, &intel_fb->base);
if (ret)
return ret;
ret = drm_framebuffer_init(dev, &intel_fb->base, &intel_fb_funcs);
ret = drm_framebuffer_init(obj->base.dev,
&intel_fb->base,
&intel_fb_funcs);
if (ret) {
DRM_ERROR("framebuffer init failed %d\n", ret);
return ret;
goto err;
}
atomic_inc(&intel_fb->obj->framebuffer_references);
return 0;
err:
atomic_dec(&obj->framebuffer_references);
return ret;
}
static struct drm_framebuffer *
@ -14526,7 +14511,7 @@ intel_user_framebuffer_create(struct drm_device *dev,
if (!obj)
return ERR_PTR(-ENOENT);
fb = intel_framebuffer_create(dev, &mode_cmd, obj);
fb = intel_framebuffer_create(obj, &mode_cmd);
if (IS_ERR(fb))
i915_gem_object_put(obj);

7
drivers/gpu/drm/i915/intel_drv.h
View File

@ -1233,7 +1233,7 @@ void intel_ddi_clock_get(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config);
void intel_ddi_set_vc_payload_alloc(struct drm_crtc *crtc, bool state);
uint32_t ddi_signal_levels(struct intel_dp *intel_dp);
unsigned int intel_fb_align_height(struct drm_device *dev,
unsigned int intel_fb_align_height(struct drm_i915_private *dev_priv,
unsigned int height,
uint32_t pixel_format,
uint64_t fb_format_modifier);
@ -1341,9 +1341,8 @@ struct i915_vma *
intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb, unsigned int rotation);
void intel_unpin_fb_vma(struct i915_vma *vma);
struct drm_framebuffer *
__intel_framebuffer_create(struct drm_device *dev,
struct drm_mode_fb_cmd2 *mode_cmd,
struct drm_i915_gem_object *obj);
intel_framebuffer_create(struct drm_i915_gem_object *obj,
struct drm_mode_fb_cmd2 *mode_cmd);
void intel_finish_page_flip_cs(struct drm_i915_private *dev_priv, int pipe);
void intel_finish_page_flip_mmio(struct drm_i915_private *dev_priv, int pipe);
void intel_check_page_flip(struct drm_i915_private *dev_priv, int pipe);

21
drivers/gpu/drm/i915/intel_fbdev.c
View File

@ -121,7 +121,7 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
struct drm_i915_private *dev_priv = to_i915(dev);
struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct drm_mode_fb_cmd2 mode_cmd = {};
struct drm_i915_gem_object *obj = NULL;
struct drm_i915_gem_object *obj;
int size, ret;
/* we don't do packed 24bpp */
@ -136,14 +136,13 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
sizes->surface_depth);
mutex_lock(&dev->struct_mutex);
size = mode_cmd.pitches[0] * mode_cmd.height;
size = PAGE_ALIGN(size);
/* If the FB is too big, just don't use it since fbdev is not very
* important and we should probably use that space with FBC or other
* features. */
obj = NULL;
if (size * 2 < ggtt->stolen_usable_size)
obj = i915_gem_object_create_stolen(dev_priv, size);
if (obj == NULL)
@ -151,24 +150,22 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
if (IS_ERR(obj)) {
DRM_ERROR("failed to allocate framebuffer\n");
ret = PTR_ERR(obj);
goto out;
goto err;
}
fb = __intel_framebuffer_create(dev, &mode_cmd, obj);
fb = intel_framebuffer_create(obj, &mode_cmd);
if (IS_ERR(fb)) {
i915_gem_object_put(obj);
ret = PTR_ERR(fb);
goto out;
goto err_obj;
}
mutex_unlock(&dev->struct_mutex);
ifbdev->fb = to_intel_framebuffer(fb);
return 0;
out:
mutex_unlock(&dev->struct_mutex);
err_obj:
i915_gem_object_put(obj);
err:
return ret;
}
@ -631,7 +628,7 @@ static bool intel_fbdev_init_bios(struct drm_device *dev,
}
cur_size = intel_crtc->config->base.adjusted_mode.crtc_vdisplay;
cur_size = intel_fb_align_height(dev, cur_size,
cur_size = intel_fb_align_height(to_i915(dev), cur_size,
fb->base.format->format,
fb->base.modifier);
cur_size *= fb->base.pitches[0];