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Subject[PATCH v9 5/5] drm/amdgpu: resize VRAM BAR for CPU access v5
Date
From: Christian König <christian.koenig@amd.com>

Try to resize BAR0 to let CPU access all of VRAM.

v2: rebased, style cleanups, disable mem decode before resize,
handle gmc_v9 as well, round size up to power of two.
v3: handle gmc_v6 as well, release and reassign all BARs in the driver.
v4: rename new function to amdgpu_device_resize_fb_bar,
reenable mem decoding only if all resources are assigned.
v5: reorder resource release, return -ENODEV instead of BUG_ON().

Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 48 ++++++++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 12 ++++++--
drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 13 ++++++--
drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 13 ++++++--
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 14 ++++++---
6 files changed, 88 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 7ecfc5303f4f..ac4e6f6fb6d8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1850,6 +1850,7 @@ void amdgpu_ttm_placement_from_domain(struct amdgpu_bo *abo, u32 domain);
bool amdgpu_ttm_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
void amdgpu_vram_location(struct amdgpu_device *adev, struct amdgpu_mc *mc, u64 base);
void amdgpu_gart_location(struct amdgpu_device *adev, struct amdgpu_mc *mc);
+int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev);
void amdgpu_ttm_set_active_vram_size(struct amdgpu_device *adev, u64 size);
int amdgpu_ttm_init(struct amdgpu_device *adev);
void amdgpu_ttm_fini(struct amdgpu_device *adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 57addfe9e89b..8f2be5a36625 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -414,6 +414,9 @@ static int amdgpu_doorbell_init(struct amdgpu_device *adev)
return 0;
}

+ if (pci_resource_flags(adev->pdev, 2) & IORESOURCE_UNSET)
+ return -EINVAL;
+
/* doorbell bar mapping */
adev->doorbell.base = pci_resource_start(adev->pdev, 2);
adev->doorbell.size = pci_resource_len(adev->pdev, 2);
@@ -732,6 +735,51 @@ int amdgpu_fw_reserve_vram_init(struct amdgpu_device *adev)
return r;
}

+/**
+ * amdgpu_device_resize_fb_bar - try to resize FB BAR
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Try to resize FB BAR to make all VRAM CPU accessible. We try very hard not
+ * to fail, but if any of the BARs is not accessible after the size we abort
+ * driver loading by returning -ENODEV.
+ */
+int amdgpu_device_resize_fb_bar(struct amdgpu_device *adev)
+{
+ u64 space_needed = roundup_pow_of_two(adev->mc.real_vram_size);
+ u32 rbar_size = order_base_2(((space_needed >> 20) | 1)) - 1;
+ u16 cmd;
+ int r;
+
+ /* Disable memory decoding while we change the BAR addresses and size */
+ pci_read_config_word(adev->pdev, PCI_COMMAND, &cmd);
+ pci_write_config_word(adev->pdev, PCI_COMMAND,
+ cmd & ~PCI_COMMAND_MEMORY);
+
+ /* Free the VRAM and doorbell BAR, we most likely need to move both. */
+ amdgpu_doorbell_fini(adev);
+ if (adev->asic_type >= CHIP_BONAIRE)
+ pci_release_resource(adev->pdev, 2);
+
+ pci_release_resource(adev->pdev, 0);
+
+ r = pci_resize_resource(adev->pdev, 0, rbar_size);
+ if (r == -ENOSPC)
+ DRM_INFO("Not enough PCI address space for a large BAR.");
+ else if (r && r != -ENOTSUPP)
+ DRM_ERROR("Problem resizing BAR0 (%d).", r);
+
+ pci_assign_unassigned_bus_resources(adev->pdev->bus);
+
+ /* When the doorbell or fb BAR isn't available we have no chance of
+ * using the device.
+ */
+ r = amdgpu_doorbell_init(adev);
+ if (r || (pci_resource_flags(adev->pdev, 0) & IORESOURCE_UNSET))
+ return -ENODEV;
+
+ pci_write_config_word(adev->pdev, PCI_COMMAND, cmd);
+}

/*
* GPU helpers function.
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
index f4603a7c8ef3..d2a43db22cff 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
@@ -283,6 +283,7 @@ static int gmc_v6_0_mc_init(struct amdgpu_device *adev)

u32 tmp;
int chansize, numchan;
+ int r;

tmp = RREG32(mmMC_ARB_RAMCFG);
if (tmp & (1 << 11)) {
@@ -324,12 +325,17 @@ static int gmc_v6_0_mc_init(struct amdgpu_device *adev)
break;
}
adev->mc.vram_width = numchan * chansize;
- /* Could aper size report 0 ? */
- adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
- adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
/* size in MB on si */
adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
+
+ if (!(adev->flags & AMD_IS_APU)) {
+ r = amdgpu_device_resize_fb_bar(adev);
+ if (r)
+ return r;
+ }
+ adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
+ adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
adev->mc.visible_vram_size = adev->mc.aper_size;

/* set the gart size */
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
index b0528ca9207b..583d87792820 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
@@ -322,6 +322,8 @@ static void gmc_v7_0_mc_program(struct amdgpu_device *adev)
*/
static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
{
+ int r;
+
adev->mc.vram_width = amdgpu_atombios_get_vram_width(adev);
if (!adev->mc.vram_width) {
u32 tmp;
@@ -367,13 +369,18 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
}
adev->mc.vram_width = numchan * chansize;
}
- /* Could aper size report 0 ? */
- adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
- adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
/* size in MB on si */
adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;

+ if (!(adev->flags & AMD_IS_APU)) {
+ r = amdgpu_device_resize_fb_bar(adev);
+ if (r)
+ return r;
+ }
+ adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
+ adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
+
#ifdef CONFIG_X86_64
if (adev->flags & AMD_IS_APU) {
adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) << 22;
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
index f368cfe2f585..9ca5fea93ebc 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
@@ -498,6 +498,8 @@ static void gmc_v8_0_mc_program(struct amdgpu_device *adev)
*/
static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
{
+ int r;
+
adev->mc.vram_width = amdgpu_atombios_get_vram_width(adev);
if (!adev->mc.vram_width) {
u32 tmp;
@@ -543,13 +545,18 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
}
adev->mc.vram_width = numchan * chansize;
}
- /* Could aper size report 0 ? */
- adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
- adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
/* size in MB on si */
adev->mc.mc_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;
adev->mc.real_vram_size = RREG32(mmCONFIG_MEMSIZE) * 1024ULL * 1024ULL;

+ if (!(adev->flags & AMD_IS_APU)) {
+ r = amdgpu_device_resize_fb_bar(adev);
+ if (r)
+ return r;
+ }
+ adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
+ adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
+
#ifdef CONFIG_X86_64
if (adev->flags & AMD_IS_APU) {
adev->mc.aper_base = ((u64)RREG32(mmMC_VM_FB_OFFSET)) << 22;
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 621699331e09..0de4dc068516 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -440,6 +440,7 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
{
u32 tmp;
int chansize, numchan;
+ int r;

adev->mc.vram_width = amdgpu_atomfirmware_get_vram_width(adev);
if (!adev->mc.vram_width) {
@@ -482,17 +483,22 @@ static int gmc_v9_0_mc_init(struct amdgpu_device *adev)
adev->mc.vram_width = numchan * chansize;
}

- /* Could aper size report 0 ? */
- adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
- adev->mc.aper_size = pci_resource_len(adev->pdev, 0);
/* size in MB on si */
adev->mc.mc_vram_size =
((adev->flags & AMD_IS_APU) ? nbio_v7_0_get_memsize(adev) :
nbio_v6_1_get_memsize(adev)) * 1024ULL * 1024ULL;
adev->mc.real_vram_size = adev->mc.mc_vram_size;
- adev->mc.visible_vram_size = adev->mc.aper_size;
+
+ if (!(adev->flags & AMD_IS_APU)) {
+ r = amdgpu_device_resize_fb_bar(adev);
+ if (r)
+ return r;
+ }
+ adev->mc.aper_base = pci_resource_start(adev->pdev, 0);
+ adev->mc.aper_size = pci_resource_len(adev->pdev, 0);

/* In case the PCI BAR is larger than the actual amount of vram */
+ adev->mc.visible_vram_size = adev->mc.aper_size;
if (adev->mc.visible_vram_size > adev->mc.real_vram_size)
adev->mc.visible_vram_size = adev->mc.real_vram_size;

--
2.11.0
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