xf86-video-intel/src/i830_memory.c

/**************************************************************************

Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
Copyright © 2002 by David Dawes.

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/*
 * Authors:
 *   Keith Whitwell <keith@tungstengraphics.com>
 *   David Dawes <dawes@xfree86.org>
 *
 * Updated for Dual Head capabilities:
 *   Alan Hourihane <alanh@tungstengraphics.com>
 */

/**
 * @file i830_memory.c
 *
 * This is the video memory allocator.  Our memory allocation is different from
 * other graphics chips, where you have a fixed amount of graphics memory
 * available that you want to put to the best use.  Instead, we have almost no
 * memory pre-allocated, and we have to choose an appropriate amount of sytem
 * memory to use.
 *
 * The allocations we might do:
 *
 * - Ring buffer
 * - HW cursor block (either one block or four)
 * - Overlay registers
 * - Front buffer (screen 1)
 * - Front buffer (screen 2, only in zaphod mode)
 * - Back/depth buffer (3D only)
 * - Compatibility texture pool (optional, more is always better)
 * - New texture pool (optional, more is always better.  aperture allocation
 *     only)
 *
 * The user may request a specific amount of memory to be used
 * (intel->pEnt->videoRam != 0), in which case allocations have to fit within
 * that much aperture.  If not, the individual allocations will be
 * automatically sized, and will be fit within the maximum aperture size.
 * Only the actual memory used (not alignment padding) will get actual AGP
 * memory allocated.
 *
 * Given that the allocations listed are generally a page or more than a page,
 * our allocator will only return page-aligned offsets, simplifying the memory
 * binding process.  For smaller allocations, the acceleration architecture's
 * linear allocator is preferred.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <assert.h>
#include <inttypes.h>
#include <string.h>
#include <sys/types.h>
#include <sys/ioctl.h>

#include "xf86.h"
#include "xf86_OSproc.h"

#include "i830.h"
#include "i810_reg.h"
#include "i915_drm.h"

/**
 * Returns the fence size for a tiled area of the given size.
 */
unsigned long i830_get_fence_size(intel_screen_private *intel, unsigned long size)
{
	unsigned long i;
	unsigned long start;

	if (IS_I965G(intel)) {
		/* The 965 can have fences at any page boundary. */
		return ALIGN(size, GTT_PAGE_SIZE);
	} else {
		/* Align the size to a power of two greater than the smallest fence
		 * size.
		 */
		if (IS_I9XX(intel))
			start = MB(1);
		else
			start = KB(512);

		for (i = start; i < size; i <<= 1) ;

		return i;
	}
}

/**
 * On some chips, pitch width has to be a power of two tile width, so
 * calculate that here.
 */
unsigned long
i830_get_fence_pitch(intel_screen_private *intel, unsigned long pitch,
		     uint32_t tiling_mode)
{
	unsigned long i;
	unsigned long tile_width = (tiling_mode == I915_TILING_Y) ? 128 : 512;

	if (tiling_mode == I915_TILING_NONE)
		return pitch;

	/* 965 is flexible */
	if (IS_I965G(intel))
		return ROUND_TO(pitch, tile_width);

	/* Pre-965 needs power of two tile width */
	for (i = tile_width; i < pitch; i <<= 1) ;

	return i;
}

static Bool
i830_check_display_stride(ScrnInfoPtr scrn, int stride, Bool tiling)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	int limit = KB(32);

	/* 8xx spec has always 8K limit, but tests show larger limit in
	   non-tiling mode, which makes large monitor work. */
	if ((IS_845G(intel) || IS_I85X(intel)) && tiling)
		limit = KB(8);

	if (IS_I915(intel) && tiling)
		limit = KB(8);

	if (IS_I965G(intel) && tiling)
		limit = KB(16);

	if (IS_IGDNG(intel) && tiling)
		limit = KB(32);

	if (stride <= limit)
		return TRUE;
	else
		return FALSE;
}

void i830_free_memory(ScrnInfoPtr scrn, i830_memory * mem)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);

	if (mem == NULL)
		return;

	assert(mem->bo != NULL);

	dri_bo_unreference(mem->bo);
	if (intel->bo_list == mem) {
		intel->bo_list = mem->next;
		if (mem->next)
			mem->next->prev = NULL;
	} else {
		if (mem->prev)
			mem->prev->next = mem->next;
		if (mem->next)
			mem->next->prev = mem->prev;
	}
	xfree(mem->name);
	xfree(mem);
	return;
}

/* Resets the state of the aperture allocator, freeing all memory that had
 * been allocated.
 */
void i830_reset_allocations(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	int p;

	/* Free any allocations in buffer objects */
	while (intel->bo_list != NULL)
		i830_free_memory(scrn, intel->bo_list);

	/* Null out the pointers for all the allocations we just freed.  This is
	 * kind of gross, but at least it's just one place now.
	 */
	for (p = 0; p < 2; p++)
		intel->cursor_mem_argb[p] = NULL;

	intel->front_buffer = NULL;
}

/* Allocates video memory at the given size, pitch, alignment and tile format.
 *
 * The memory will be bound automatically when the driver is in control of the
 * VT.  When the kernel memory manager is available and compatible with flags
 * (that is, flags doesn't say that the allocation must include a physical
 * address), that will be used for the allocation.
 *
 * flags:
 * - NEED_PHYSICAL_ADDR: Allocates the memory physically contiguous, and return
 *   the bus address for that memory.
 * - NEED_NON-STOLEN: don't allow any part of the memory allocation to lie
 *   within stolen memory
 * - NEED_LIFETIME_FIXED: don't allow the buffer object to move throughout
 *   the entire Screen lifetime.  This means not using buffer objects, which
 *   get their offsets chosen at each EnterVT time.
 */
i830_memory *i830_allocate_memory(ScrnInfoPtr scrn, const char *name,
				  unsigned long size, unsigned long pitch,
				  int flags, uint32_t tiling_mode)
{
	i830_memory *mem;
	intel_screen_private *intel = intel_get_screen_private(scrn);
	uint32_t requested_tiling_mode = tiling_mode;
	int ret;

	/* Manage tile alignment and size constraints */
	if (tiling_mode != I915_TILING_NONE) {
		/* Only allocate page-sized increments. */
		size = ALIGN(size, GTT_PAGE_SIZE);

		/* Check for maximum tiled region size */
		if (IS_I9XX(intel)) {
			if (size > MB(128))
				return NULL;
		} else {
			if (size > MB(64))
				return NULL;
		}

		/* round to size necessary for the fence register to work */
		size = i830_get_fence_size(intel, size);
	}

	assert((flags & NEED_PHYSICAL_ADDR) == 0);

	/* Only allocate page-sized increments. */
	size = ALIGN(size, GTT_PAGE_SIZE);

	mem = xcalloc(1, sizeof(*mem));
	if (mem == NULL)
		return NULL;

	mem->name = xstrdup(name);
	if (mem->name == NULL) {
		xfree(mem);
		return NULL;
	}

	mem->bo = dri_bo_alloc(intel->bufmgr, name, size, GTT_PAGE_SIZE);

	if (!mem->bo) {
		xfree(mem->name);
		xfree(mem);
		return NULL;
	}

	mem->pitch = pitch;

	ret = drm_intel_bo_set_tiling(mem->bo, &tiling_mode, pitch);
	if (ret != 0 || tiling_mode != requested_tiling_mode) {
		xf86DrvMsg(scrn->scrnIndex, X_ERROR,
			   "Failed to set tiling on %s: %s\n", mem->name,
			   ret == 0 ? "rejected by kernel" : strerror(-ret));
	}

	if (flags & DISABLE_REUSE)
		drm_intel_bo_disable_reuse(mem->bo);

	/* Insert new allocation into the list */
	mem->prev = NULL;
	mem->next = intel->bo_list;
	if (intel->bo_list != NULL)
		intel->bo_list->prev = mem;
	intel->bo_list = mem;

	return mem;
}

static Bool IsTileable(ScrnInfoPtr scrn, int pitch)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);

	if (IS_I965G(intel)) {
		if (pitch / 512 * 512 == pitch && pitch <= KB(128))
			return TRUE;
		else
			return FALSE;
	}

	/*
	 * Allow tiling for pitches that are a power of 2 multiple of 128 bytes,
	 * up to 64 * 128 (= 8192) bytes.
	 */
	switch (pitch) {
	case 128:
	case 256:
		if (IS_I945G(intel) || IS_I945GM(intel) || IS_G33CLASS(intel))
			return TRUE;
		else
			return FALSE;
	case 512:
	case KB(1):
	case KB(2):
	case KB(4):
	case KB(8):
		return TRUE;
	default:
		return FALSE;
	}
}

/**
 * Allocates a framebuffer for a screen.
 *
 * Used once for each X screen, so once with RandR 1.2 and twice with classic
 * dualhead.
 */
i830_memory *i830_allocate_framebuffer(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	unsigned int pitch = scrn->displayWidth * intel->cpp;
	long size, fb_height;
	int flags;
	i830_memory *front_buffer = NULL;
	uint32_t tiling_mode;

	flags = ALLOW_SHARING | DISABLE_REUSE;

	/* We'll allocate the fb such that the root window will fit regardless of
	 * rotation.
	 */
	fb_height = scrn->virtualY;

	size = ROUND_TO_PAGE(pitch * fb_height);

	if (intel->tiling && IsTileable(scrn, pitch))
		tiling_mode = I915_TILING_X;
	else
		tiling_mode = I915_TILING_NONE;

	if (!i830_check_display_stride(scrn, pitch,
				       tiling_mode != I915_TILING_NONE)) {
		xf86DrvMsg(scrn->scrnIndex, X_ERROR,
			   "Front buffer stride %d kB "
			   "exceed display limit\n", pitch / 1024);
		return NULL;
	}

	front_buffer = i830_allocate_memory(scrn, "front buffer", size,
					    pitch, flags, tiling_mode);

	if (front_buffer == NULL) {
		xf86DrvMsg(scrn->scrnIndex, X_ERROR,
			   "Failed to allocate framebuffer.\n");
		return NULL;
	}

	i830_set_gem_max_sizes(scrn);

	return front_buffer;
}

static Bool i830_allocate_cursor_buffers(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
	int i;

	/*
	 * Allocate four separate buffers when the kernel doesn't support
	 * large allocations as on Linux. If any of these fail, just
	 * bail back to software cursors everywhere
	 */
	for (i = 0; i < xf86_config->num_crtc; i++) {
		intel->cursor_mem_argb[i] =
		    i830_allocate_memory(scrn, "ARGB cursor",
					 HWCURSOR_SIZE_ARGB, PITCH_NONE,
					 DISABLE_REUSE, I915_TILING_NONE);
		if (!intel->cursor_mem_argb[i])
			return FALSE;

	}
	return TRUE;
}

/*
 * Allocate memory for 2D operation.  This includes the (front) framebuffer,
 * ring buffer, scratch memory, HW cursor.
 */
Bool i830_allocate_2d_memory(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);

	/* Next, allocate other fixed-size allocations we have. */
	if (!i830_allocate_cursor_buffers(scrn)) {
		xf86DrvMsg(scrn->scrnIndex, X_ERROR,
			   "Failed to allocate HW cursor space.\n");
		return FALSE;
	}

	intel->front_buffer = i830_allocate_framebuffer(scrn);
	if (intel->front_buffer == NULL)
		return FALSE;

	return TRUE;
}

/**
 * Called at EnterVT to reinit memory related stuff. Also reinits the drmmode
 * cursors.
 */
Bool i830_reinit_memory(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
	int i;

	for (i = 0; i < xf86_config->num_crtc; i++)
		drmmode_crtc_set_cursor_bo(xf86_config->crtc[i],
					   intel->cursor_mem_argb[i]->bo);

	i830_set_gem_max_sizes(scrn);

	if (intel->front_buffer)
		scrn->fbOffset = intel->front_buffer->bo->offset;

	return TRUE;
}

#ifdef INTEL_XVMC
/*
 * Allocate memory for MC compensation
 */
Bool i830_allocate_xvmc_buffer(ScrnInfoPtr scrn, const char *name,
			       i830_memory ** buffer, unsigned long size,
			       int flags)
{
	*buffer = i830_allocate_memory(scrn, name, size, PITCH_NONE,
				       flags, I915_TILING_NONE);

	if (!*buffer) {
		xf86DrvMsg(scrn->scrnIndex, X_ERROR,
			   "Failed to allocate memory for %s.\n", name);
		return FALSE;
	}

	if ((*buffer)->bo) {
		if (drm_intel_bo_pin((*buffer)->bo, GTT_PAGE_SIZE)) {
			i830_free_memory(scrn, *buffer);
			xf86DrvMsg(scrn->scrnIndex, X_ERROR,
				   "Failed to bind XvMC buffer bo!\n");
			return FALSE;
		}
	}

	return TRUE;
}

void i830_free_xvmc_buffer(ScrnInfoPtr scrn, i830_memory * buffer)
{
	if (buffer->bo)
		drm_intel_bo_unpin(buffer->bo);

	i830_free_memory(scrn, buffer);
}

#endif

static void i830_set_max_gtt_map_size(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	struct drm_i915_gem_get_aperture aperture;
	int ret;

	/* Default low value in case it gets used during server init. */
	intel->max_gtt_map_size = 16 * 1024 * 1024;

	ret =
	    ioctl(intel->drmSubFD, DRM_IOCTL_I915_GEM_GET_APERTURE, &aperture);
	if (ret == 0) {
		/* Let objects up get bound up to the size where only 2 would fit in
		 * the aperture, but then leave slop to account for alignment like
		 * libdrm does.
		 */
		intel->max_gtt_map_size =
		    aperture.aper_available_size * 3 / 4 / 2;
	}
}

static void i830_set_max_tiling_size(ScrnInfoPtr scrn)
{
	intel_screen_private *intel = intel_get_screen_private(scrn);
	struct drm_i915_gem_get_aperture aperture;
	int ret;

	/* Default low value in case it gets used during server init. */
	intel->max_tiling_size = 4 * 1024 * 1024;

	ret =
	    ioctl(intel->drmSubFD, DRM_IOCTL_I915_GEM_GET_APERTURE, &aperture);
	if (ret == 0) {
		/* Let objects be tiled up to the size where only 4 would fit in
		 * the aperture, presuming worst case alignment.
		 */
		intel->max_tiling_size = aperture.aper_available_size / 4;
		if (!IS_I965G(intel))
			intel->max_tiling_size /= 2;
	}
}

void i830_set_gem_max_sizes(ScrnInfoPtr scrn)
{
	i830_set_max_gtt_map_size(scrn);
	i830_set_max_tiling_size(scrn);
}